@article{miao_tvcg_2018,
title = "Multiscale Visualization and Scale-adaptive Modification of
DNA Nanostructures",
author = "Haichao Miao and Elisa De Llano and Johannes Sorger and
Yasaman Ahmadi and Tadija Kekic and Tobias Isenberg and
Eduard Gr\"{o}ller and Ivan Barisic and Ivan Viola",
year = "2018",
month = jan,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "24",
number = "1",
URL = "https://www.cg.tuwien.ac.at/research/publications/2018/miao_tvcg_2018/",
}
@article{Schernthaner-2017-MCP,
title = "Multipath Curved Planar Reformations of Peripheral CT
Angiography: Diagnostic Accuracy and Time Efficiency",
author = "Markus Schreiner and Hannes Platzgummer and Sylvia
Unterhumer and Michael Weber and Gabriel Mistelbauer and
Eduard Gr\"{o}ller and Christian Loewe and R\"{u}diger
Schernthaner",
year = "2018",
abstract = "Objectives To compare diagnostic performance and time
efficiency between 3D multipath curved planar reformations
(mpCPRs) and axial images of CT angiography for the
pre-interventional assessment of peripheral arterial disease
(PAD), with digital subtraction angiography as the standard
of reference. Methods Forty patients (10 females, mean age
72 years), referred to CTA prior to endovascular treatment
of PAD, were prospectively included and underwent peripheral
CT angiography. A semiautomated toolbox was used to render
mpCPRs. Twenty-one arterial segments were defined in each
leg; for each segment, the presence of stenosis[70% was
assessed on mpCPRs and axial images by two readers,
independently, with digital subtraction angiography as gold
standard. Results Both readers reached lower sensitivity
(Reader 1: 91 vs. 94%, p = 0.08; Reader 2: 89 vs. 93%, p =
0.03) but significantly higher specificity (Reader 1: 94 vs.
89%, p\0.01; Reader 2: 96 vs. 95%, p = 0.01) with mpCPRs
than with axial images. Reader 1 achieved significantly
higher accuracy with mpCPRs (93 vs. 91%, p = 0.02), and
Reader 2 had similar overall accuracy in both evaluations
(94 vs. 94%, p = 0.96). Both readers read mpCPRs
significantly faster than axial images (Reader 1: 504500
based on mpCPRs vs. 704000 based on axial images; Reader 2:
404100 based on mpCPRs vs. 605700 based on axial images;
p\0.01). Conclusions mpCPRs are a promising 3D reformation
technique that facilitates a fast assessment of PAD with
high diagnostic accuracy.",
month = may,
doi = "10.1007/s00270-017-1846-3",
issn = "0174-1551",
journal = "CardioVascular and Interventional Radiology",
number = "5",
volume = "41",
pages = "718--725",
keywords = "PAD, CTA, 3D reformation, mpCPRs",
URL = "https://www.cg.tuwien.ac.at/research/publications/2018/Schernthaner-2017-MCP/",
}
@talk{Groeller-2017-ARTORW,
title = "A Random Talk on Random Walks",
author = "Eduard Gr\"{o}ller",
year = "2017",
month = oct,
event = "10 Years Bergen VisGroup Celebration",
location = "University of Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Groeller-2017-ARTORW/",
}
@article{mindek-2017-dsn,
title = "Data-Sensitive Visual Navigation",
author = "Peter Mindek and Gabriel Mistelbauer and Eduard Gr\"{o}ller
and Stefan Bruckner",
year = "2017",
abstract = "In visualization systems it is often the case that the
changes of the input parameters are not proportional to the
visual change of the generated output. In this paper, we
propose a model for enabling data-sensitive navigation for
user-interface elements. This model is applied to normalize
the user input according to the visual change, and also to
visually communicate this normalization. In this way, the
exploration of heterogeneous data using common interaction
elements can be performed in an efficient way. We apply our
model to the field of medical visualization and present
guided navigation tools for traversing vascular structures
and for camera rotation around 3D volumes. The presented
examples demonstrate that the model scales to user-interface
elements where multiple parameters are set simultaneously.",
month = oct,
journal = "Computers & Graphics",
volume = "67",
number = "C",
pages = "77--85",
keywords = "navigation, exploration, medical visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/mindek-2017-dsn/",
}
@article{Diehl-2017-Albero,
title = "Albero: A Visual Analytics Approach for Probabilistic
Weather Forecasting",
author = "Alexandra Diehl and Leandro Pelorosso and Claudio Delrieux
and Kresimir Matkovic and Eduard Gr\"{o}ller and Stefan
Bruckner",
year = "2017",
abstract = "Probabilistic weather forecasts are amongst the most popular
ways to quantify numerical forecast uncertainties. The
analog regression method can quantify uncertainties and
express them as probabilities. The method comprises the
analysis of errors from a large database of past forecasts
generated with a specific numerical model and observational
data. Current visualization tools based on this method are
essentially automated and provide limited analysis
capabilities. In this paper, we propose a novel approach
that breaks down the automatic process using the experience
and knowledge of the users and creates a new interactive
visual workflow. Our approach allows forecasters to study
probabilistic forecasts, their inner analogs and
observations, their associated spatial errors, and
additional statistical information by means of coordinated
and linked views. We designed the presented solution
following a participatory methodology together with domain
experts. Several meteorologists with different backgrounds
validated the approach. Two case studies illustrate the
capabilities of our solution. It successfully facilitates
the analysis of uncertainty and systematic model biases for
improved decision-making and process-quality measurements.",
month = oct,
journal = "Computer Graphics Forum 36(7) 135-144 (2017)",
doi = "10.1111/cgf.13279",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Diehl-2017-Albero/",
}
@WorkshopTalk{Groeller-2017-AMOS,
title = "A Matter of Scale",
author = "Eduard Gr\"{o}ller",
year = "2017",
abstract = "Scale and scalability have been recurring topics in our
field. Recent developments like smart data, machine
learning, and advances in domains like biology, cartography,
smart communities, and communication pose novel challenges
to scalability and use of scale. Examples include
scale-transparent visual computing, cross-scale
visualization and interaction, massive multi-scale
techniques, scale integration, cross-scale labeling and
annotation, cross scales on structure and dynamics, and
continuous scales",
month = sep,
event = "Molecular Animation Summit",
location = "University of Utah, SCI",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Groeller-2017-AMOS/",
}
@talk{Groeller-2017-AVC,
title = "Adaptive Visual Computing",
author = "Eduard Gr\"{o}ller",
year = "2017",
abstract = "Visual computing uses computer-supported, interactive,
visual representations of (abstract) data to amplify
cognition. In recent years data complexity concerning
volume, veracity, velocity, and variety has increased
considerably. Several adaptive visual computing approaches
are discussed in detail. Data-sensitive navigation for
user-interface elements is presented. The approach
normalizes user input according to visual change, and also
visually communicates this normalization. In this way,
output-sensitive interactions can be realized. Quantitative
and reproducible linking & brushing as integral part of
visual analytics is approached through structured brushing,
percentile brushes, linked statistics, and change
visualization. Multiscale models, e.g., from structural
biology, require multiscale dynamic color mapping with
sometimes overlapping or contradicting colors. We present a
technique, which adaptively, based on the current scale
level, nonlinearly and seamlessly adjusts the color scheme
to depict or distinguish the currently best visible
structural information. Adaptive visual computing is
addressing the amplified data complexity through increased
scalability. Research challenges and directions are sketched
at the end of the talk. ",
month = aug,
event = "Visit of University of Konstanz",
location = "University of Konstanz",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Groeller-2017-AVC/",
}
@misc{Groeller-2017-PTPMD,
title = "AnimoAminoMiner: Exploration of Protein Tunnels and their
Properties in Molecular Dynamics",
author = "Jan Byska and Mathieu Le Muzic and Eduard Gr\"{o}ller and
Ivan Viola and Barbora Kozlikova",
year = "2017",
month = jul,
event = "BioVis@ISMB 2017",
Conference date = "Poster presented at BioVis@ISMB 2017 (2017-07-24)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Groeller-2017-PTPMD/",
}
@inproceedings{sorger_2017_metamorphers,
title = "Metamorphers: Storytelling Templates For Illustrative
Animated Transitions in Molecular Visualization",
author = "Johannes Sorger and Peter Mindek and Peter Rautek and Eduard
Gr\"{o}ller and Graham Johnson and Ivan Viola",
year = "2017",
abstract = "In molecular biology, illustrative animations are used to
convey complex biological phenomena to broad audiences.
However, such animations have to be manually authored in 3D
modeling software, a time consuming task that has to be
repeated from scratch for every new data set, and requires a
high level of expertise in illustration, animation, and
biology. We therefore propose metamorphers: a set of
operations for defining animation states as well as the
transitions to them in the form of re-usable story telling
templates. The re-usability is two-fold. Firstly, due to
their modular nature, metamorphers can be re-used in
different combinations to create a wide range of animations.
Secondly, due to their abstract nature, metamorphers can be
re-used to re-create an intended animation for a wide range
of compatible data sets. Metamorphers thereby mask the low
level complexity of explicit animation specifications by
exploiting the inherent properties of the molecular data,
such as the position, size, and hierarchy level of a
semantic data subset.",
month = may,
location = "Mikulov, Czech Republic",
booktitle = "Proceedings of the Spring Conference on Computer Graphics
2017",
pages = "27--36",
keywords = "animated transitions, storytelling, molecular visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/sorger_2017_metamorphers/",
}
@inproceedings{waldner-2017-vph,
title = "Exploring Visual Prominence of Multi-Channel Highlighting in
Visualizations",
author = "Manuela Waldner and Alexey Karimov and Eduard Gr\"{o}ller",
year = "2017",
abstract = "Visualizations make rich use of multiple visual channels so
that there are few resources left to make selected focus
elements visually distinct from their surrounding context. A
large variety of highlighting techniques for visualizations
has been presented in the past, but there has been little
systematic evaluation of the design space of highlighting.
We explore highlighting from the perspective of visual marks
and channels – the basic building blocks of visualizations
that are directly controlled by visualization designers. We
present the results from two experiments, exploring the
visual prominence of highlighted marks in scatterplots:
First, using luminance as a single highlight channel, we
found that visual prominence is mainly determined by the
luminance difference between the focus mark and the
brightest context mark. The brightness differences between
context marks and the overall brightness level have
negligible influence. Second, multi-channel highlighting
using luminance and blur leads to a good trade-off between
highlight effectiveness and aesthetics. From the results, we
derive a simple highlight model to balance highlighting
across multiple visual channels and focus and context marks,
respectively.",
month = may,
booktitle = "Spring Conference on Computer Graphics 2017",
keywords = "information visualization, highlighting, focus+context,
visual prominence",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/waldner-2017-vph/",
}
@inproceedings{Ganuza-2017-IVCSGM,
title = "Interactive Visual Categorization of Spinel-Group Minerals",
author = " Mar\'{i}a Luj\'{a}n Ganuza and Gabriela Ferracutti and
Maria Florencia Gargiulo and Silvia Castro and Ernesto Bjerg
and Eduard Gr\"{o}ller and Kresimir Matkovic",
year = "2017",
abstract = "Spinel-group minerals are excellent indicators of geological
environments and are of invaluable help in the search for
mineral deposits of economic interest. The geologists
analyze them by means of Barnes and Roeder’s contours. In
this paper, we present a collection of novel, interactive
methods, which assist geologists in the categorization of
spinel-group minerals. We fully integrate Barnes and
Roeder’s contours using a polygonal representation. This
makes it possible to efficiently superimpose user-provided
point data over the contours, and to automatically rank the
contours based on the number of enclosed points. We also
allow the expert to create contours for the user-provided
point data. Once user contours are created, they can be
compared with Barnes and Roeder’s contours. During the
analysis, the user can drill-down by means of brushing. As
we deal with specific data, we apply two novel brushing
techniques, i.e., the percentile brush and the contour
brush. The novel brushing mechanisms along with the
interactive comparison speed-up the analysis significantly.
We evaluate the newly introduced approach and the resulting
novel workflow using real-word data from different locations
in Argentina. According to the domain experts, the
classification of spinel minerals needs several minutes now,
while it took a few days with the current state of the art
approach in the domain.",
month = may,
event = "33rd Spring Conference on Computer Graphics (SCCG 2017)",
booktitle = "Proceedings of the 33rd Spring Conference on Computer
Graphics (SCCG 2017)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Ganuza-2017-IVCSGM/",
}
@misc{Ganuza,
title = "Visualizaci\'{o}n y Realidad Aumentada en el Campo de las
Ciencias Geol\'{o}gicas",
author = " Mar\'{i}a Luj\'{a}n Ganuza and J.M. Trippel Nagel and
N.F. Gazc\'{o}n and Silvia Castro and Ernesto Bjerg and
Maria Florencia Gargiulo and Gabriela Ferracutti and
Kresimir Matkovic and Eduard Gr\"{o}ller",
year = "2017",
abstract = "En el campo de las Ciencias Geol\'{o}gicas, un desaf\'{i}o
importante consiste en encontrar una representaci\'{o}n
adecuada de una gran cantidad de datos de distintos tipos,
que abarcan an\'{a}lisis de muestras minerales, datos
topogr\'{a}ficos, proyecciones cartogr\'{a}ficas, datos
geof\'{i}sicos, entre otros. La exploraci\'{o}n y
an\'{a}lisis de estos datos requiere un soporte visual
adecuado. Por otra parte, es importante la asistencia de
dispositivos m\'{o}viles al momento de adquirir estos datos
en el trabajo de campo. En esta l\'{i}nea de
investigaci\'{o}n se est\'{a} trabajando en el diseño y la
generaci\'{o}n de visualizaciones y de sistemas que las
soporten con el objetivo de asistir al ge\'{o}logo en varias
de sus tareas habituales. Por un lado, una sub-l\'{i}nea se
refiere a la visualizaci\'{o}n de datos geol\'{o}gicos que
provean un soporte adecuado para la exploraci\'{o}n
eficiente de distintos conjuntos de datos de
micro-qu\'{i}mica. Por otro, se trabaja en incorporar
visualizaciones que asistan al ge\'{o}logo en la
obtenci\'{o}n de datos geol\'{o}gicos en el trabajo de
campo; esto se lleva a cabo mediante el uso de
tecnolog\'{i}a de Realidad Aumentada y el uso de
dispositivos m\'{o}viles.",
month = apr,
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Ganuza/",
}
@inproceedings{amirkhanov-2017-cffet,
title = "Comparison of Final Fracture Extraction Techniques for
Interrupted In situ Tensile Tests of Glass Fiber Reinforced
Polymers",
author = "Aleksandr Amirkhanov and Dietmar Salaberger and Johannes
Kastner and Christoph Heinzl and Eduard Gr\"{o}ller",
year = "2017",
abstract = "To develop and optimize of advanced composite materials such
as glass fiber reinforced polymers (GFRPs) for a specific
application area is an important topic. To inspect
mechanical properties of GFRPs, material engineers use
interrupted in situ tensile tests. During these tests, a
test specimen is scanned multiple times in an industrial
computed tomography (CT) scanner under various loads,
starting from no load until the final fracture of the
specimen. In this work we focus on the final step of the
interrupted in situ tensile test, which is scanned when the
specimen is completely losing its structural integrity in
the final fracture zone. The defects occurring in the
subsequent loading stages merge and ultimately form the
final fracture. For this reason, conventional techniques
tend to generate error prone final fracture regions or
surfaces and thus require more advanced algorithms for
extraction. The main contribution of this paper is found in
the comparison of different techniques for extracting the
final fracture. In the comparison we outline advantages and
drawbacks of the presented techniques relative to each
other.",
month = feb,
booktitle = "Proceedings of 7th Conference on Industrial Computed
Tomography , Leuven , Belgium (iCT 2017) ",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/amirkhanov-2017-cffet/",
}
@WorkshopTalk{Groeller-2017-IVAMCS,
title = "Interactive Visual Analysis in the Material and
Computational Sciences",
author = "Eduard Gr\"{o}ller",
year = "2017",
abstract = "Visualization and visual computing use computer-supported,
interactive, visual representations of (abstract) data to
amplify cognition. In recent years data complexity
concerning volume, veracity, velocity, and variety has
increased considerably. This is due to new data sources as
well as the availability of uncertainty, error and tolerance
information. Instead of individual objects entire sets,
collections, and ensembles are visually investigated. There
is a need for visual analyses, comparative visualization,
quantitative visualizations, and scalable visualizations.
The simultaneous exploration and visualization of spatial
and abstract information is an important case in point.
Several examples from the material and computational
sciences will be discussed in detail. Given the amplified
data variability, interactive visual data analyses are
likely to gain in importance in the future. Research
challenges and directions are sketched at the end of the
talk. ",
month = jan,
event = "Workshop on Visual analysis of dynamic processes",
location = "Rigi Kulm, Switzerland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/Groeller-2017-IVAMCS/",
}
@inproceedings{vad_viktor-2017-WVE,
title = "Watergate: Visual Exploration of Water Trajectories in
Protein Dynamics",
author = "Viktor Vad and Jan Byska and Adam Jurcik and Ivan Viola and
Eduard Gr\"{o}ller and Helwig Hauser and Sergio M. Margues
and Jiri Damborsky and Barbora Kozlikova",
year = "2017",
abstract = "The function of proteins is tightly related to their
interactions with other molecules. The study of such
interactions often requires to track the molecules that
enter or exit specific regions of the proteins. This is
investigated with molecular dynamics simulations, producing
the trajectories of thousands of water molecules during
hundreds of thousands of time steps. To ease the exploration
of such rich spatio-temporal data, we propose a novel
workflow for the analysis and visualization of large sets of
water-molecule trajectories. Our solution consists of a set
of visualization techniques, which help biochemists to
classify, cluster, and filter the trajectories and to
explore the properties and behavior of selected subsets in
detail. Initially, we use an interactive histogram and a
time-line visualization to give an overview of all water
trajectories and select the interesting ones for further
investigation. Further, we depict clusters of trajectories
in a novel 2D representation illustrating the flows of water
molecules. These views are interactively linked with a 3D
representation where we show individual paths, including
their simplification, as well as extracted statistical
information displayed by isosurfaces. The proposed solution
has been designed in tight collaboration with experts to
support specific tasks in their scientific workflows. They
also conducted several case studies to evaluate the
usability and effectiveness of our new solution with respect
to their research scenarios. These confirmed that our
proposed solution helps in analyzing water trajectories and
in extracting the essential information out of the large
amount of input data.",
location = "September, 2017 Bremen, Germany",
booktitle = "Eurographics Workshop on Visual Computing for Biology and
Medicine 2017",
pages = "33--42",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/vad_viktor-2017-WVE/",
}
@article{miao_tvcg_2017,
title = "Placenta Maps: In Utero Placental Health Assessment of the
Human Fetus",
author = "Haichao Miao and Gabriel Mistelbauer and Alexey Karimov and
Amir Alansary and Alice Davidson and David F.A. Lloyd and
Mellisa Damodaram and Lisa Story and Jana Hutter and Joseph
V. Hajnal and Mary Rutherford and Bernhard Preim and
Bernhard Kainz and Eduard Gr\"{o}ller",
year = "2017",
abstract = "null",
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "23",
number = "6",
pages = "1612--1623",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/miao_tvcg_2017/",
}
@article{mindek-2017-marion,
title = "Visualization Multi-Pipeline for Communicating Biology",
author = "Peter Mindek and David Kou\v{r}il and Johannes Sorger and
David Toloudis and Blair Lyons and Graham Johnson and Eduard
Gr\"{o}ller and Ivan Viola",
year = "2017",
abstract = "We propose a system to facilitate biology communication by
developing a pipeline to support the instructional
visualization of heterogeneous biological data on
heterogeneous user-devices. Discoveries and concepts in
biology are typically summarized with illustrations
assembled manually from the interpretation and application
of heterogenous data. The creation of such illustrations is
time consuming, which makes it incompatible with frequent
updates to the measured data as new discoveries are made.
Illustrations are typically non-interactive, and when an
illustration is updated, it still has to reach the user. Our
system is designed to overcome these three obstacles. It
supports the integration of heterogeneous datasets,
reflecting the knowledge that is gained from different data
sources in biology. After pre-processing the datasets, the
system transforms them into visual representations as
inspired by scientific illustrations. As opposed to
traditional scientific illustration these representations
are generated in real-time - they are interactive. The code
generating the visualizations can be embedded in various
software environments. To demonstrate this, we implemented
both a desktop application and a remote-rendering server in
which the pipeline is embedded. The remote-rendering server
supports multi-threaded rendering and it is able to handle
multiple users simultaneously. This scalability to different
hardware environments, including multi-GPU setups, makes our
system useful for efficient public dissemination of
biological discoveries. ",
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "24",
number = "1",
keywords = "Biological visualization, remote rendering, public
dissemination",
URL = "https://www.cg.tuwien.ac.at/research/publications/2017/mindek-2017-marion/",
}
@article{klein_2017_IM,
title = "Instant Construction and Visualization of Crowded Biological
Environments",
author = "Tobias Klein and Ludovic Autin and Barbora Kozlikova and
David Goodsell and Arthur Olson and Eduard Gr\"{o}ller and
Ivan Viola",
year = "2018",
abstract = "We present the first approach to integrative structural
modeling of the biological mesoscale within an interactive
visual environment. These complex models can comprise up to
millions of molecules with defined atomic structures,
locations, and interactions. Their construction has
previously been attempted only within a non-visual and
non-interactive environment. Our solution unites the
modeling and visualization aspect, enabling interactive
construction of atomic resolution mesoscale models of large
portions of a cell. We present a novel set of GPU algorithms
that build the basis for the rapid construction of complex
biological structures. These structures consist of multiple
membrane-enclosed compartments including both soluble
molecules and fibrous structures. The compartments are
defined using volume voxelization of triangulated meshes.
For membranes, we present an extension of the Wang Tile
concept that populates the bilayer with individual lipids.
Soluble molecules are populated within compartments using
the Halton sequence for their distribution. Fibrous
structures, such as RNA or actin filaments, are created by
self-avoiding random walks. Resulting overlaps of molecules
are resolved by a forced-based system. Our approach opens
new possibilities to the world of interactive construction
of cellular compartments. We demonstrate its effectiveness
by showcasing scenes of different scale and complexity that
comprise blood plasma, mycoplasma, and HIV.",
journal = "IEEE Transactions on Visualization and Computer Graphics",
doi = "10.1109/TVCG.2017.2744258",
URL = "https://www.cg.tuwien.ac.at/research/publications/2018/klein_2017_IM/",
}
@talk{Groeller_2016_I6,
title = "Visual Computing and Analysis of Complex Systems",
author = "Eduard Gr\"{o}ller",
year = "2016",
month = dec,
event = "Invited Talk, State Key Lab of CAD&CG, Zhejiang University,
Hangzhou, China",
location = "State Key Lab of CAD&CG, Zhejiang University, Hangzhou,
China",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_I6/",
}
@talk{Groeller_2016_I5,
title = "Visual Computing and Analysis of Complex Systems",
author = "Eduard Gr\"{o}ller",
year = "2016",
month = dec,
event = "Invited talk at SIGGRAPH Asia 2016 Symposium on
Visualization, Macao, China",
location = "SIGGRAPH Asia 2016 Symposium on Visualization, Macao, China",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_I5/",
}
@talk{Groeller_2016_I8,
title = "Visual Computing for the Analysis of Complex Systems",
author = "Eduard Gr\"{o}ller",
year = "2016",
month = dec,
event = "Invited Talk at the Department of Computer Science and
Engineering (CSE) at the Hong Kong University of Science and
Technology (HKUST)",
location = "Department of Computer Science and Engineering (CSE) at the
Hong Kong University of Science and Technology (HKUST), Hong
Kong",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_I8/",
}
@article{Groeller_2016_P7,
title = "Depth functions as a quality measure and for steering
multidimensional projections",
author = "Douglas Cedrim and Viktor Vad and Afonso Paiva and Eduard
Gr\"{o}ller and Luis Gustavo Nonato and Antonio Castelo",
year = "2016",
abstract = "The analysis of multidimensional data has been a topic of
continuous research for many years.This type of data can be
found inseveral different areas ofscience. The analysis of
multidimensional data has been a topic of continuous
research for many years. This type of data can be found in
several different areas of science. A common task while
analyzing such data is to investigate patterns by
interacting with spatializations of the data in a visual
domain. Understanding the relation between the underlying
dataset characteristics and the technique used to provide
its visual representation is of fundamental importance since
it can provide a better intuition on what to expect from the
spatialization. In this paper, we propose the usage of
concepts from non-parametric statistics, namely depth
functions, as a quality measure for spatializations. We
evaluate the action of multi-dimensional projection
techniques on such estimates. We apply both qualitative and
quantitative ana-lyses on four different multidimensional
techniques selected according to the properties they aim to
preserve. We evaluate them with datasets of different
characteristics: synthetic, real world, high dimensional;
and contaminated with outliers. As a straightforward
application, we propose to use depth information to guide
multidimensional projection techniques which rely on
interaction through control point selection and positioning.
Even for techniques which do not intend to preserve any
centrality measure, interesting results can be achieved by
separating regions possibly contaminated with outliers. ",
month = nov,
journal = "Computers & Graphics (Special Section on SIBGRAPI 2016)",
volume = "60",
issn = "doi: 10.1016/j.cag.2016.08.008",
pages = "93--106",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_P7/",
}
@inproceedings{Groeller_2016_P6,
title = "PorosityAnalyzer: Visual Analysis and Evaluation of
Segmentation Pipelines to Determine the Porosity in
Fiber-Reinforced Polymers",
author = "Johannes Weissenb\"{o}ck and Artem Amirkhanov and Eduard
Gr\"{o}ller and Johannes Kastner and Christoph Heinzl",
year = "2016",
abstract = "In this paper we present PorosityAnalyzer, a novel tool for
detailed evaluation and visual analysis of pore segmentation
pipelines to determine the porosity in fiber-reinforced
polymers (FRPs). The presented tool consists of two modules:
the computation module and the analysis module. The
computation module enables a convenient setup and execution
of distributed off-line-computations on industrial 3D X-ray
computed tomography datasets. It allows the user to assemble
individual segmentation pipelines in the form of single
pipeline steps, and to specify the parameter ranges as well
as the sampling of the parameter-space of each pipeline
segment. The result of a single segmentation run consists of
the input parameters, the calculated 3D binary-segmentation
mask, the resulting porosity value, and other derived
results (e.g., segmentation pipeline runtime). The analysis
module presents the data at different levels of detail by
drill-down filtering in order to determine accurate and
robust segmentation pipelines. Overview visualizations allow
to initially compare and evaluate the segmentation
pipelines. With a scatter plot matrix (SPLOM), the
segmentation pipelines are examined in more detail based on
their input and output parameters. Individual
segmentation-pipeline runs are selected in the SPLOM and
visually examined and compared in 2D slice views and 3D
renderings by using aggregated segmentation masks and
statistical contour renderings. PorosityAnalyzer has been
thoroughly evaluated with the help of twelve domain experts.
Two case studies demonstrate the applicability of our
proposed concepts and visualization techniques, and show
that our tool helps domain experts to gain new insights and
improve their workflow efficiency.",
month = oct,
publisher = "IEEE Computer Society",
booktitle = "IEEE Conference on Visual Analytics Science and Technology,
2016 (VAST 2016)",
pages = "101--110",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_P6/",
}
@talk{Groeller_2016_I4,
title = "Visual Data Exploration",
author = "Eduard Gr\"{o}ller",
year = "2016",
month = oct,
event = "Keynote talk at the 21st International Symposium on Vision,
Modeling and Visualization (VMV 2016), Bayreuth, Germany",
location = "Keynote talk at the 21st International Symposium on Vision,
Modeling and Visualization (VMV 2016), Bayreuth, Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_I4/",
}
@article{Groeller_2016_P4,
title = "Visual Analytics for the Exploration and Assessment of
Segmentation Errors",
author = "Renata Raidou and Freek Marcelis and Marcel Breeuwer and
Eduard Gr\"{o}ller and Anna Vilanova i Bartroli and Huub van
de Wetering",
year = "2016",
abstract = "Several diagnostic and treatment procedures require the
segmentation of anatomical structures from medical images.
However, the automatic model-based methods that are often
employed, may produce inaccurate segmentations. These, if
used as input for diagnosis or treatment, can have
detrimental effects for the patients. Currently, an analysis
to predict which anatomic regions are more prone to
inaccuracies, and to determine how to improve segmentation
algorithms, cannot be performed. We propose a visual tool to
enable experts, working on model-based segmentation
algorithms, to explore and analyze the outcomes and errors
of their methods. Our approach supports the exploration of
errors in a cohort of pelvic organ segmentations, where the
performance of an algorithm can be assessed. Also, it
enables the detailed exploration and assessment of
segmentation errors, in individual subjects. To the best of
our knowledge, there is no other tool with comparable
functionality. A usage scenario is employed to explore and
illustrate the capabilities of our visual tool. To further
assess the value of the proposed tool, we performed an
evaluation with five segmentation experts. The evaluation
participants confirmed the potential of the tool in
providing new insight into their data and employed
algorithms. They also gave feedback for future improvements.",
month = sep,
journal = "Eurographics Workshop on Visual Computing for Biology and
Medicine",
pages = "193--202",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_P4/",
}
@article{ortner-2016-tunnel,
title = "Visual analytics and rendering for tunnel crack analysis",
author = "Thomas Ortner and Johannes Sorger and Harald Piringer and
Gerd Hesina and Eduard Gr\"{o}ller",
year = "2016",
abstract = "The visual analysis of surface cracks plays an essential
role in tunnel maintenance when assessing the condition of a
tunnel. To identify patterns of cracks, which endanger the
structural integrity of its concrete surface, analysts need
an integrated solution for visual analysis of geometric and
multivariate data to decide if issuing a repair project is
necessary. The primary contribution of this work is a design
study, supporting tunnel crack analysis by tightly
integrating geometric and attribute views to allow users a
holistic visual analysis of geometric representations and
multivariate attributes. Our secondary contribution is
Visual Analytics and Rendering, a methodological approach
which addresses challenges and recurring design questions in
integrated systems. We evaluated the tunnel crack analysis
solution in informal feedback sessions with experts from
tunnel maintenance and surveying. We substantiated the
derived methodology by providing guidelines and linking it
to examples from the literature.",
month = may,
journal = "The Visual Computer",
volume = "32",
number = "6",
pages = "859--869",
keywords = "Integration of spatial and non-spatial data, Methodology,
Visual analytics",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/ortner-2016-tunnel/",
}
@talk{Groeller_2016_I3,
title = "Understanding Data through Visual Exploration",
author = "Eduard Gr\"{o}ller",
year = "2016",
month = may,
event = "Keynote talk at Visionday 2016, Danmarks Tekniske
Universitet (DTU Compute)",
location = "Keynote talk at Visionday 2016, Danmarks Tekniske
Universitet (DTU Compute)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_I3/",
}
@misc{klein-2016-WCL,
title = "Towards Interactive Visual Exploration of Parallel Programs
using a Domain-Specific Language",
author = "Tobias Klein and Stefan Bruckner and Eduard Gr\"{o}ller and
Markus Hadwiger and Peter Rautek",
year = "2016",
abstract = "The use of GPUs and the massively parallel computing
paradigm have become wide-spread. We describe a framework
for the interactive visualization and visual analysis of the
run-time behavior of massively parallel programs, especially
OpenCL kernels. This facilitates understanding a program's
function and structure, finding the causes of possible
slowdowns, locating program bugs, and interactively
exploring and visually comparing different code variants in
order to improve performance and correctness. Our approach
enables very specific, user-centered analysis, both in terms
of the recording of the run-time behavior and the
visualization itself. Instead of having to manually write
instrumented code to record data, simple code annotations
tell the source-to-source compiler which code
instrumentation to generate automatically. The visualization
part of our framework then enables the interactive analysis
of kernel run-time behavior in a way that can be very
specific to a particular problem or optimization goal, such
as analyzing the causes of memory bank conflicts or
understanding an entire parallel algorithm.",
month = apr,
publisher = "ACM",
location = "Vienna, Austria",
event = "4th International Workshop on OpenCL (IWOCL '16)",
Conference date = "Poster presented at 4th International Workshop on OpenCL
(IWOCL '16) ()",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/klein-2016-WCL/",
}
@talk{Groeller_2016_I1,
title = "The Certainly Uncertain Uncertainty Talk",
author = "Eduard Gr\"{o}ller",
year = "2016",
month = apr,
event = "Second Workshop on Uncertainty, Technische Universit\"{a}t
M\"{u}nchen, Informatik 15 (Computer Graphik 6
Visualisierung)",
location = "Second Workshop on Uncertainty, Technische Universit\"{a}t
M\"{u}nchen, Informatik 15 (Computer Graphik 6
Visualisierung)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_I1/",
}
@talk{Groeller_2016_I2,
title = "Visual Computing and Comparative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2016",
month = apr,
event = "Invited Talk",
location = " Czech Technical University, Faculty of Electrical
Engineering, Department of Computer Graphics and Interaction",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_I2/",
}
@article{ortner-2016-visaware,
title = "Vis-a-ware: Integrating spatial and non-spatial
visualization for visibility-aware urban planning",
author = "Thomas Ortner and Johannes Sorger and Harald Steinlechner
and Gerd Hesina and Harald Piringer and Eduard Gr\"{o}ller",
year = "2016",
abstract = "3D visibility analysis plays a key role in urban planning
for assessing the visual impact of proposed buildings on the
cityscape. A call for proposals typically yields around 30
candidate buildings that need to be evaluated with respect
to selected viewpoints. Current visibility analysis methods
are very time-consuming and limited to a small number of
viewpoints. Further, analysts neither have measures to
evaluate candidates quantitatively, nor to compare them
efficiently. The primary contribution of this work is the
design study of Vis-A-Ware, a visualization system to
qualitatively and quantitatively evaluate, rank, and compare
visibility data of candidate buildings with respect to a
large number of viewpoints. Vis-A-Ware features a 3D spatial
view of an urban scene and non-spatial views of data derived
from visibility evaluations, which are tightly integrated by
linked interaction. To enable a quantitative evaluation we
developed four metrics in accordance with experts from urban
planning. We illustrate the applicability of Vis-A-Ware on
the basis of a use case scenario and present results from
informal feedback sessions with domain experts from urban
planning and development. This feedback suggests that
Vis-A-Ware is a valuable tool for visibility analysis
allowing analysts to answer complex questions more
efficiently and objectively.",
month = jan,
journal = "Visualization and Computer Graphics, IEEE Transactions on",
issn = "1077-2626 ",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/ortner-2016-visaware/",
}
@article{sorger-2015-litevis,
title = "LiteVis: Integrated Visualization for Simulation-Based
Decision Support in Lighting Design",
author = "Johannes Sorger and Thomas Ortner and Christian Luksch and
Michael Schw\"{a}rzler and Eduard Gr\"{o}ller and Harald
Piringer",
year = "2016",
abstract = "State-of-the-art lighting design is based on physically
accurate lighting simulations of scenes such as offices. The
simulation results support lighting designers in the
creation of lighting configurations, which must meet
contradicting customer objectives regarding quality and
price while conforming to industry standards. However,
current tools for lighting design impede rapid feedback
cycles. On the one side, they decouple analysis and
simulation specification. On the other side, they lack
capabilities for a detailed comparison of multiple
configurations. The primary contribution of this paper is a
design study of LiteVis, a system for efficient decision
support in lighting design. LiteVis tightly integrates
global illumination-based lighting simulation, a spatial
representation of the scene, and non-spatial visualizations
of parameters and result indicators. This enables an
efficient iterative cycle of simulation parametrization and
analysis. Specifically, a novel visualization supports
decision making by ranking simulated lighting configurations
with regard to a weight-based prioritization of objectives
that considers both spatial and non-spatial characteristics.
In the spatial domain, novel concepts support a detailed
comparison of illumination scenarios. We demonstrate LiteVis
using a real-world use case and report qualitative feedback
of lighting designers. This feedback indicates that LiteVis
successfully supports lighting designers to achieve key
tasks more efficiently and with greater certainty.",
month = jan,
journal = "Visualization and Computer Graphics, IEEE Transactions on",
volume = "22",
number = "1",
issn = "1077-2626 ",
pages = "290--299",
keywords = "Integrating Spatial and Non-Spatial Data",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/sorger-2015-litevis/",
}
@article{Labschuetz_Matthias_2016_JITT,
title = "JiTTree: A Just-in-Time Compiled Sparse GPU Volume Data
Structure",
author = "Matthias Labsch\"{u}tz and Stefan Bruckner and Eduard
Gr\"{o}ller and Markus Hadwiger and Peter Rautek",
year = "2016",
abstract = "Sparse volume data structures enable the efficient
representation of large but sparse volumes in GPU memory for
computation and visualization. However, the choice of a
specific data structure for a given data set depends on
several factors, such as the memory budget, the sparsity of
the data, and data access patterns. In general, there is no
single optimal sparse data structure, but a set of several
candidates with individual strengths and drawbacks. One
solution to this problem are hybrid data structures which
locally adapt themselves to the sparsity. However, they
typically suffer from increased traversal overhead which
limits their utility in many applications. This paper
presents JiTTree, a novel sparse hybrid volume data
structure that uses just-in-time compilation to overcome
these problems. By combining multiple sparse data structures
and reducing traversal overhead we leverage their individual
advantages. We demonstrate that hybrid data structures adapt
well to a large range of data sets. They are especially
superior to other sparse data structures for data sets that
locally vary in sparsity. Possible optimization criteria are
memory, performance and a combination thereof. Through
just-in-time (JIT) compilation, JiTTree reduces the
traversal overhead of the resulting optimal data structure.
As a result, our hybrid volume data structure enables
efficient computations on the GPU, while being superior in
terms of memory usage when compared to non-hybrid data
structures.",
month = jan,
issn = "1077-2626",
journal = "IEEE Transactions on Visualization and Computer Graphics",
note = "Published in January 2016",
number = "1",
volume = "22",
event = "IEEE SciVis 2015",
location = "Chicago, IL, USA",
pages = "1025--1034",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Labschuetz_Matthias_2016_JITT/",
}
@article{Viola_Ivan_2015_AAM,
title = "AnimoAminoMiner: Exploration of Protein Tunnels and their
Properties in Molecular Dynamics",
author = "Jan Byska and Mathieu Le Muzic and Eduard Gr\"{o}ller and
Ivan Viola and Barbora Kozlikova",
year = "2016",
abstract = "In this paper we propose a novel method for the interactive
exploration of protein tunnels. The basic principle of our
approach is that we entirely abstract from the 3D/4D space
the simulated phenomenon is embedded in. A complex 3D
structure and its curvature information is represented only
by a straightened tunnel centerline and its width profile.
This representation focuses on a key aspect of the studied
geometry and frees up graphical estate to key chemical and
physical properties represented by surrounding amino acids.
The method shows the detailed tunnel profile and its
temporal aggregation. The profile is interactively linked
with a visual overview of all amino acids which are lining
the tunnel over time. In this overview, each amino acid is
represented by a set of colored lines depicting the spatial
and temporal impact of the amino acid on the corresponding
tunnel. This representation clearly shows the importance of
amino acids with respect to selected criteria. It helps the
biochemists to select the candidate amino acids for mutation
which changes the protein function in a desired way. The
AnimoAminoMiner was designed in close cooperation with
domain experts. Its usefulness is documented by their
feedback and a case study, which are included.",
month = jan,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "22",
number = "1",
issn = "1077-2626",
pages = "747--756",
keywords = "aggregation, molecular dynamics, Protein, interaction,
tunnel",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Viola_Ivan_2015_AAM/",
}
@inproceedings{Waldin_Nicholas_2016_Chameleon,
title = "Chameleon Dynamic Color Mapping for Multi-Scale Structural
Biology Models",
author = "Nicholas Waldin and Mathieu Le Muzic and Manuela Waldner and
Eduard Gr\"{o}ller and David Goodsell and Ludovic Autin and
Ivan Viola",
year = "2016",
abstract = "Visualization of structural biology data uses color to
categorize or separate dense structures into particular
semantic units. In multiscale models of viruses or bacteria,
there are atoms on the finest level of detail, then
amino-acids, secondary structures, macromolecules, up to the
compartment level and, in all these levels, elements can be
visually distinguished by color. However, currently only
single scale coloring schemes are utilized that show
information for one particular scale only. We present a
novel technology which adaptively, based on the current
scale level, adjusts the color scheme to depict or
distinguish the currently best visible structural
information. We treat the color as a visual resource that is
distributed given a particular demand. The changes of the
color scheme are seamlessly interpolated between the color
scheme from the previous views into a given new one. With
such dynamic multi-scale color mapping we ensure that the
viewer is able to distinguish structural detail that is
shown on any given scale. This technique has been tested by
users with an expertise in structural biology and has been
overall well received.",
event = "VCBM",
booktitle = "Eurographics Workshop on Visual Computing for Biology and
Medicine",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Waldin_Nicholas_2016_Chameleon/",
}
@article{miao_2016_cgf,
title = "Visual Quantification of the Circle of Willis: An Automated
Identification and Standardized Representation",
author = "Haichao Miao and Gabriel Mistelbauer and Christian Nasel and
Eduard Gr\"{o}ller",
year = "2016",
abstract = "This paper presents a method for the visual quantification
of cerebral arteries, known as the Circle of Willis (CoW).
It is an arterial structure with the responsibility of
supplying the brain with blood, however, dysfunctions can
lead to strokes. The diagnosis of such a
time-critical/urgent event depends on the expertise of
radiologists and the applied software tools. They use basic
display methods of the volumetric data without any support
of advanced image processing and visualization techniques.
The goal of this paper is to present an automated method for
the standardized description of cerebral arteries in stroke
patients in order to provide an overview of the CoW's
configuration. This novel representation provides visual
indications of problematic areas as well as straightforward
comparisons between multiple patients. Additionally, we
offer a pipeline for extracting the CoW from Time-of-Flight
Magnetic Resonance Angiography (TOF-MRA) data sets together
with an enumeration technique for labelling the arterial
segments by detecting the main supplying arteries of the
CoW. We evaluated the feasibility of our visual
quantification approach in a study of 63 TOF-MRA data sets
and compared our findings to those of three radiologists.
The obtained results demonstrate that our proposed
techniques are effective in detecting the arteries and
visually capturing the overall configuration of the CoW.",
issn = "1467-8659",
journal = "Computer Graphics Forum",
keywords = "Circle of Willis, medical visualization, information
visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/miao_2016_cgf/",
}
@article{Groeller_2016_P1,
title = " Visual Analysis of Defects in Glass Fiber Reinforced
Polymers for 4DCT Interrupted In situ Tests",
author = "Aleksandr Amirkhanov and Artem Amirkhanov and Dietmar
Salaberger and Johannes Kastner and Eduard Gr\"{o}ller and
Christoph Heinzl",
year = "2016",
abstract = "Material engineers use interrupted in situ tensile testing
to investigate the damage mechanisms in composite materials.
For each subsequent scan, the load is incrementally
increased until the specimen is completely fractured. During
the interrupted in situ testing of glass fiber reinforced
polymers (GFRPs) defects of four types are expected to
appear: matrix fracture, fiber/matrix debonding, fiber
pull-out, and fiber fracture. There is a growing demand for
the detection and analysis of these defects among the
material engineers. In this paper, we present a novel
workflow for the detection, classification, and visual
analysis of defects in GFRPs using interrupted in situ
tensile tests in combination with X-ray Computed Tomography.
The workflow is based on the automatic extraction of defects
and fibers. We introduce the automatic Defect Classifier
assigning the most suitable type to each defect based on its
geometrical features. We present a visual analysis system
that integrates four visualization methods: 1) the Defect
Viewer highlights defects with visually encoded type in the
context of the original CT image, 2) the Defect Density Maps
provide an overview of the defect distributions according to
type in 2D and 3D, 3) the Final Fracture Surface estimates
the material fracture’s location and displays it as a 3D
surface, 4) the 3D Magic Lens enables interactive
exploration by combining detailed visualizations in the
region of interest with overview visualizations as context.
In collaboration with material engineers, we evaluate our
solution and demonstrate its practical applicability.",
journal = "Computer Graphics Forum (2016)",
volume = " 35",
number = "3",
issn = "doi: 10.1111/cgf.12896",
pages = "201--210",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_P1/",
}
@article{Groeller_2016_P3,
title = "State of the Art in Transfer Functions for Direct Volume
Rendering",
author = "P. Ljung and J. Kr\"{u}ger and Eduard Gr\"{o}ller and Markus
Hadwiger and C. Hansen and Anders Ynnerman",
year = "2016",
abstract = "A central topic in scientific visualization is the transfer
function (TF) for volume rendering. The TF serves a
fundamental role in translating scalar and multivariate data
into color and opacity to express and reveal the relevant
features present in the data studied. Beyond this core
functionality, TFs also serve as a tool for encoding and
utilizing domain knowledge and as an expression for visual
design of material appearances. TFs also enable interactive
volumetric exploration of complex data. The purpose of this
state-of-the-art report (STAR) is to provide an overview of
research into the various aspects of TFs, which lead to
interpretation of the underlying data through the use of
meaningful visual representations. The STAR classifies TF
research into the following aspects: dimensionality, derived
attributes, aggregated attributes, rendering aspects,
automation, and user interfaces. The STAR concludes with
some interesting research challenges that form the basis of
an agenda for the development of next generation TF tools
and methodologies.",
journal = "Computer Graphics Forum (2016)",
volume = "35",
number = "3",
pages = "669--691",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_P3/",
}
@article{Groeller_2016_P2,
title = "Towards Quantitative Visual Analytics with Structured
Brushing and Linked Statistics",
author = "Sanjin Rados and Rainer Splechtna and Kresimir Matkovic and
Mario Duras and Eduard Gr\"{o}ller and Helwig Hauser",
year = "2016",
abstract = "Until now a lot of visual analytics predominantly delivers
qualitative results—based, for example, on a continuous
color map or a detailed spatial encoding. Important target
applications, however, such as medical diagnosis and
decision making, clearly benefit from quantitative analysis
results. In this paper we propose several specific
extensions to the well-established concept of
linking&brushing in order to make the analysis results more
quantitative. We structure the brushing space in order to
improve the reproducibility of the brushing operation, e.g.,
by introducing the percentile grid. We also enhance the
linked visualization with overlaid descriptive statistics to
enable a more quantitative reading of the resulting
focus+context visualization. Addition- ally, we introduce
two novel brushing techniques: the percentile brush and the
Mahalanobis brush. Both use the underlying data to support
statistically meaningful interactions with the data. We
illustrate the use of the new techniques in the context of
two case studies, one based on meteorological data and the
other one focused on data from the automotive industry where
we evaluate a shaft design in the context of mechanical
power transmission in cars.",
journal = "Computer Graphics Forum (2016)",
volume = "35",
number = "3",
pages = "251--260",
URL = "https://www.cg.tuwien.ac.at/research/publications/2016/Groeller_2016_P2/",
}
@article{Red_Andreas_2015_FFT,
title = "Fuzzy feature tracking",
author = "Andreas Reh and Aleksandr Amirkhanov and Johann Kastner and
Eduard Gr\"{o}ller and Christoph Heinzl",
year = "2015",
abstract = "In situ analysis is becoming increasingly important in the
evaluation of existing as well as novel materials and
components. In this domain, specialists require answers on
questions such as: How does a process change internal and
external structures of a component? or How do the internal
features evolve?In this work, we present a novel integrated
visual analysis tool to evaluate series of X-ray Computed
Tomography (XCT) data. We therefore process volume datasets
of a series of XCT scans, which non-destructively cover the
evolution of a process by in situ scans. After the
extraction of individual features, a feature tracking
algorithm is applied to detect changes of features
throughout the series as events. We distinguish between
creation, continuation, split, merge and dissipation events.
As an explicit tracking is not always possible, we introduce
the computation of a Tracking Uncertainty. We visualize the
data together with the determined events in multiple
linked-views, each emphasizing individual aspects of the
4D-XCT dataset series: A Volume Player and a 3D Data View
show the spatial feature information, whereas the global
overview of the feature evolution is visualized in the Event
Explorer. The Event Explorer allows for interactive
exploration and selection of the events of interest. The
selection is further used as basis to calculate a Fuzzy
Tracking Graph visualizing the global evolution of the
features over the whole series.We finally demonstrate the
results and advantages of the proposed tool using various
real world applications, such as a wood shrinkage analysis
and an AlSiC alloy under thermal load. Graphical
abstractDisplay Omitted HighlightsWe calculate a Tracking
Uncertainty in order to find correlated features.The Event
Explorer shows a global overview of events and feature
properties.The Fuzzy Tracking Graph is used to track
features through all time-steps.The Volume Player shows
control elements to traverse the steps of a dataset series.",
month = dec,
journal = "Computers and Graphics",
number = "PB",
volume = "53",
pages = "177--184",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Red_Andreas_2015_FFT/",
}
@misc{Diehl_2015,
title = "Albero: A Visual Analytics Tool for Probabilistic Weather
Forecasting.",
author = "Alexandra Diehl and Leandro Pelorosso and Kresimir Matkovic
and Claudio Delrieux and Marc Ruiz and Eduard Gr\"{o}ller
and Stefan Bruckner",
year = "2015",
month = nov,
location = "University of Buenos Aires",
event = "Poster at Workshop Big Data & Environment",
Conference date = "Poster presented at Poster at Workshop Big Data &
Environment (2015-11)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Diehl_2015/",
}
@misc{Ganuza_2015,
title = "Interactive Semi-Automatic Categorization for Spinel Group
Minerals",
author = " Mar\'{i}a Luj\'{a}n Ganuza and Maria Florencia Gargiulo and
Gabriela Ferracutti and Silvia Castro and Ernesto Bjerg and
Eduard Gr\"{o}ller and Kresimir Matkovic",
year = "2015",
month = oct,
event = "IEEE VIS 2015 ",
editor = "IEEE",
Conference date = "Poster presented at IEEE VIS 2015 (2015-10)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Ganuza_2015/",
}
@misc{Ganuza_ML_2015_ISA,
title = "Interactive Semi-Automatic Categorization for Spinel Group
Minerals",
author = " Mar\'{i}a Luj\'{a}n Ganuza and Maria Florencia Gargiulo and
Gabriela Ferracutti and Silvia Castro and Ernesto Bjerg and
Eduard Gr\"{o}ller and Kresimir Matkovic",
year = "2015",
abstract = "Spinel group minerals are excellent indicators of geological
environments (tectonic settings). In 2001, Barnes and Roeder
defined a set of contours corresponding to compositional
fields for spinel group minerals. Geologists typically use
this contours to estimate the tectonic environment where a
particular spinel composition could have been formed. This
task is prone to errors and requires tedious manual
comparison of overlapping diagrams. We introduce a
semi-automatic, interactive detection of tectonic settings
for an arbitrary dataset based on the Barnes and Roeder
contours. The new approach integrates the mentioned contours
and includes a novel interaction called contour brush. The
new methodology is integrated in the Spinel Explorer system
and it improves the scientist's workflow significantly.",
month = oct,
location = "Chicago, IL, USA ",
isbn = " 978-1-4673-9783-4",
event = "2015 IEEE Conference on Visual Analytics Science and
Technology (VAST) (2015)",
Conference date = "Poster presented at 2015 IEEE Conference on Visual Analytics
Science and Technology (VAST) (2015)
(2015-10-25--2015-10-30)",
note = "197--198",
pages = "197 – 198",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Ganuza_ML_2015_ISA/",
}
@inproceedings{sorger-2015-taxintec,
title = "A Taxonomy of Integration Techniques for Spatial and
Non-Spatial Visualizations",
author = "Johannes Sorger and Thomas Ortner and Harald Piringer and
Gerd Hesina and Eduard Gr\"{o}ller",
year = "2015",
abstract = "Research on visual data representations is traditionally
classified into methods assuming an inherent mapping from
data values to spatial coordinates (scientific visualization
and real-time rendering) and methods for abstract data
lacking explicit spatial references (information
visualization). In practice, however, many applications need
to analyze data comprising abstract and spatial information,
thereby spanning both visualization domains. Traditional
classification schemes do not support a formal description
of these integrated systems. The contribution of this paper
is a taxonomy that describes a holistic design space for
integrating components of spatial and abstract
visualizations. We structure a visualization into three
components: Data, Visual, and Navigation. These components
can be linked to build integrated visualizations. Our
taxonomy provides an alternative view on the field of
visualization in a time where the border between scientific
and information visualization becomes blurred.",
month = oct,
series = "Springer Lecture Notes in Computer Science (LNCS) series",
publisher = "The Eurographics Association",
location = "Aachen, Germany",
issn = "0302-9743",
editor = "David Bommes and Tobias Ritschel and Thomas Schultz",
booktitle = "20th International Symposium on Vision, Modeling and
Visualization (VMV 2015)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/sorger-2015-taxintec/",
}
@article{Labschuetz_Matthias_2015_JIT,
title = "JiTTree: A Just-in-Time Compiled Sparse GPU Volume Data
Structure",
author = "Matthias Labsch\"{u}tz and Stefan Bruckner and Eduard
Gr\"{o}ller and Markus Hadwiger and Peter Rautek",
year = "2015",
abstract = "Sparse volume data structures enable the efficient
representation of large but sparse volumes in GPU memory for
computation and visualization. However, the choice of a
specific data structure for a given data set depends on
several factors, such as the memory budget, the sparsity of
the data, and data access patterns. In general, there is no
single optimal sparse data structure, but a set of several
candidates with individual strengths and drawbacks. One
solution to this problem are hybrid data structures which
locally adapt themselves to the sparsity. However, they
typically suffer from increased traversal overhead which
limits their utility in many applications. This paper
presents JiTTree, a novel sparse hybrid volume data
structure that uses just-in-time compilation to overcome
these problems. By combining multiple sparse data structures
and reducing traversal overhead we leverage their individual
advantages. We demonstrate that hybrid data structures adapt
well to a large range of data sets. They are especially
superior to other sparse data structures for data sets that
locally vary in sparsity. Possible optimization criteria are
memory, performance and a combination thereof. Through
just-in-time (JIT) compilation, JiTTree reduces the
traversal overhead of the resulting optimal data structure.
As a result, our hybrid volume data structure enables
efficient computations on the GPU, while being superior in
terms of memory usage when compared to non-hybrid data
structures.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "22",
number = "1",
note = "Published in January 2016",
issn = "1077-2626",
pages = "1025--1034",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Labschuetz_Matthias_2015_JIT/",
}
@inproceedings{Miao_2015_VCBM,
title = "CoWRadar: Visual Quantification of the Circle of Willis in
Stroke Patients",
author = "Haichao Miao and Gabriel Mistelbauer and Christian Nasel and
Eduard Gr\"{o}ller",
year = "2015",
abstract = "This paper presents a method for the visual quantification
of cerebral arteries, known as the Circle of Willis (CoW).
The CoW is an arterial structure that is responsible for the
brain’s blood supply. Dysfunctions of this arterial circle
can lead to strokes. The diagnosis relies on the
radiologist’s expertise and the software tools used. These
tools consist of very basic display methods of the
volumetric data without support of advanced technologies in
medical image processing and visualization. The goal of this
paper is to create an automated method for the standardized
description of cerebral arteries in stroke patients in order
to provide an overview of the CoW’s configuration. This
novel display provides visual indications of problematic
areas as well as straightforward comparisons between
multiple patients. Additionally, we offer a pipeline for
extracting the CoW from Time-of-Flight Magnetic Resonance
Angiography (TOF-MRA) data sets. An enumeration technique
for the labeling of the arterial segments is therefore
suggested. We also propose a method for detecting the
CoW’s main supplying arteries by analyzing the coronal,
sagittal and transverse image planes of the data sets. We
evaluated the feasibility of our visual quantification
approach in a study of 63 TOF-MRA data sets and compared our
findings to those of three radiologists. The obtained
results demonstrate that our proposed techniques are
effective in detecting the arteries of the CoW.",
month = sep,
isbn = "978-3-905674-82-8",
publisher = "The Eurographics Association",
organization = "EG Digital Library",
location = "Chester, United Kingdom",
issn = "2070-5786",
editor = "Katja B\"{u}hler and Lars Linsen and Nigel W. John",
booktitle = "EG Workshop on Visual Computing for Biology and Medicine",
pages = "1--10",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Miao_2015_VCBM/",
}
@article{Mistelbauer_Gabriel_2015_NHR,
title = "New hybrid reformations of peripheral CT angiography: do we
still need axial images?",
author = "R\"{u}diger Schernthaner and Florian Wolf and Gabriel
Mistelbauer and Michael Weber and Milo\v{s} \v{S}r\'{a}mek
and Eduard Gr\"{o}ller and Christian Loewe",
year = "2015",
abstract = "Purpose To quantify the detectability of peripheral artery
stenosis on hybrid CT angiography (CTA) reformations.
Methods Hybrid reformations were developed by combining
multipath curved planar reformations (mpCPR) and maximum
intensity projections (MIP). Fifty peripheral CTAs were
evaluated twice: either with MIP, mpCPR and axial images or
with hybrid reformations only. Digital subtraction
angiography served as gold standard. Results Using hybrid
reformations, two independent readers detected 88.0% and
81.3% of significant stenosis, respectively. However, CTA
including axial images detected statistically significant
more lesions (98%). Conclusion Peripheral CTA reading
including axial images is still recommended. Further
improvement of these hybrid reformations is necessary.",
month = jul,
journal = "Clinic Imaging",
number = "4",
volume = "39",
pages = "603--607",
keywords = "Peripheral arterial occlusive disease;, CT angiography;,
Three-dimensional reformations;, Postprocessing",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Mistelbauer_Gabriel_2015_NHR/",
}
@article{Cornel_Daniel_2015_VOC,
title = "Visualization of Object-Centered Vulnerability to Possible
Flood Hazards",
author = "Daniel Cornel and Artem Konev and Berhard Sadransky and
Zsolt Horvath and Eduard Gr\"{o}ller and J\"{u}rgen Waser",
year = "2015",
abstract = "As flood events tend to happen more frequently, there is a
growing demand for understanding the vulnerability of
infrastructure to flood-related hazards. Such demand exists
both for flood management personnel and the general public.
Modern software tools are capable of generating
uncertainty-aware flood predictions. However, the
information addressing individual objects is incomplete,
scattered, and hard to extract. In this paper, we address
vulnerability to flood-related hazards focusing on a
specific building. Our approach is based on the automatic
extraction of relevant information from a large collection
of pre-simulated flooding events, called a scenario pool.
From this pool, we generate uncertainty-aware visualizations
conveying the vulnerability of the building of interest to
different kinds of flooding events. On the one hand, we
display the adverse effects of the disaster on a detailed
level, ranging from damage inflicted on the building facades
or cellars to the accessibility of the important
infrastructure in the vicinity. On the other hand, we
provide visual indications of the events to which the
building of interest is vulnerable in particular. Our visual
encodings are displayed in the context of urban 3D
renderings to establish an intuitive relation between
geospatial and abstract information. We combine all the
visualizations in a lightweight interface that enables the
user to study the impacts and vulnerabilities of interest
and explore the scenarios of choice. We evaluate our
solution with experts involved in flood management and
public communication.",
month = jun,
journal = "Computer Graphic Forum",
volume = "34",
number = "3",
note = "3rd Best Paper Award",
issn = "1467-8659 (Online ISSN)",
pages = "331--340",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Cornel_Daniel_2015_VOC/",
}
@WorkshopTalk{Vad_Viktor_2015_RVV,
title = "Reproducibility, Verification, and Validation of Experiments
on the Marschner-Lobb Test Signal",
author = "Viktor Vad and Bal\'{a}zs Cs\'{e}bfalvi and Peter Rautek and
Eduard Gr\"{o}ller",
year = "2015",
abstract = "The Marschner-Lobb (ML) test signal has been used for two
decades to evaluate the visual quality of different
volumetric reconstruction schemes. Previously, the
reproduction of these experiments was very simple, as the ML
signal was used to evaluate only compact filters applied on
the traditional Cartesian lattice. As the Cartesian lattice
is separable, it is easy to implement these filters as
separable tensor-product extensions of well-known 1D filter
kernels. Recently, however, non-separable reconstruction
filters have received increased attention that are much more
difficult to implement than the traditional tensor-product
filters. Even if these are piecewise polynomial filters, the
space partitions of the polynomial pieces are geometrically
rather complicated. Therefore, the reproduction of the ML
experiments is getting more and more difficult. Recently, we
reproduced a previously published ML experiment for
comparing Cartesian Cubic (CC), Body-Centered Cubic (BCC),
and Face-Centered Cubic (FCC) lattices in terms of
prealiasing. We recognized that the previously applied
settings were biased and gave an undue advantage to the
FCC-sampled ML representation. This result clearly shows
that reproducibility, verification, and validation of the ML
experiments is of crucial importance as the ML signal is the
most frequently used benchmark for demonstrating the
superiority of a reconstruction scheme or volume
representations on non-Cartesian lattices.",
month = may,
event = "EuroVis Workshop on Reproducibility, Verification, and
Validation in Visualization (EuroRV3)",
location = "Cagliari, Sardinia, Italy",
journal = "@inproceedings {eurorv3.20151140",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Vad_Viktor_2015_RVV/",
}
@article{Viola_Ivan_2015_MCT,
title = "MoleCollar and Tunnel Heat Map Visualizations for Conveying
Spatio-Temporo-Chemical Properties Across and Along Protein
Voids",
author = "Jan Byska and Adam Jurcik and Eduard Gr\"{o}ller and Ivan
Viola and Barbora Kozlikova",
year = "2015",
abstract = "Studying the characteristics of proteins and their inner
void space, including their geometry, physico-chemical
properties and dynamics are instrumental for evaluating the
reactivity of the protein with other small molecules. The
analysis of long simulations of molecular dynamics produces
a large number of voids which have to be further explored
and evaluated. In this paper we propose three new methods:
two of them convey important properties along the long axis
of a selected void during molecular dynamics and one
provides a comprehensive picture across the void. The first
two proposed methods use a specific heat map to present two
types of information: an overview of all detected tunnels in
the dynamics and their bottleneck width and stability over
time, and an overview of a specific tunnel in the dynamics
showing the bottleneck position and changes of the tunnel
length over time. These methods help to select a small
subset of tunnels, which are explored individually and in
detail. For this stage we propose the third method, which
shows in one static image the temporal evolvement of the
shape of the most critical tunnel part, i.e., its
bottleneck. This view is enriched with abstract depictions
of different physicochemical properties of the amino acids
surrounding the bottleneck. The usefulness of our newly
proposed methods is demonstrated on a case study and the
feedback from the domain experts is included. The
biochemists confirmed that our novel methods help to convey
the information about the appearance and properties of
tunnels in a very intuitive and comprehensible manner.",
month = may,
journal = "Computer Graphics Forum",
volume = "3",
number = "34",
note = "EuroVis 2015 - Conference Proceedings",
pages = "1--10",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Viola_Ivan_2015_MCT/",
}
@inproceedings{Bruckner_Stefan_2015_VAS,
title = "Visual Analysis of Spatio-Temporal Data: Applications in
Weather Forecasting",
author = "Alexandra Diehl and Eduard Gr\"{o}ller and Stefan Bruckner",
year = "2015",
abstract = "Weather conditions affect multiple aspects of human life
such as economy, safety, security, and social activities.
For this reason, weather forecast plays a major role in
society. Currently weather forecasts are based on Numerical
Weather Prediction (NWP) models that generate a
representation of the atmospheric flow. Interactive
visualization of geo-spatial data has been widely used in
order to facilitate the analysis of NWP models. This paper
presents a visualization system for the analysis of
spatio-temporal patterns in short-term weather forecasts.
For this purpose, we provide an interactive visualization
interface that guides users from simple visual overviews to
more advanced visualization techniques. Our solution
presents multiple views that include a timeline with
geo-referenced maps, an integrated webmap view, a forecast
operation tool, a curve-pattern selector, spatial filters,
and a linked meteogram. Two key contributions of this work
are the timeline with geo-referenced maps and the
curve-pattern selector. The latter provides novel
functionality that allows users to specify and search for
meaningful patterns in the data. The visual interface of our
solution allows users to detect both possible weather trends
and errors in the weather forecast model.We illustrate the
usage of our solution with a series of case studies that
were designed and validated in collaboration with domain
experts.",
month = may,
location = "Cagliari, Sardinia, Italy",
booktitle = "Computer Graphic Forum",
pages = "381--390",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Bruckner_Stefan_2015_VAS/",
}
@article{Froehler_Berhnard_2015_ESM,
title = "Multimodal Visualization and Analysis of Spectral and XCT
Data",
author = "Bernhard Fr\"{o}hler and Artem Amirkhanov and Johann Kastner
and Eduard Gr\"{o}ller and Christoph Heinzl",
year = "2015",
abstract = "An increasing number of industrial applications demand a
comprehensive analysis of both structural and chemical
composition. Typically, non-destructive testing techniques
focus on either structural or chemical characterization but
do not deliver both. 3D X-Ray Computed Tomography (XCT)
scans are well-suited for determining the internal and
external structure of an object at high resolution. The
attenuation value it delivers can however be the same or
very similar for different materials. For a detailed
chemical analysis XCT is therefore combined with spectral
characterization techniques such as K-Edge Absorptiometry or
X-ray Fluorescence Spectroscopy. In this paper, we are
extending a previously introduced framework for
visualization and analysis of specimens scanned with these
two modalities in multiple ways: For better understanding
the dependencies between the spectral energy levels, we
propose Spectral Similarity Maps. Spectral Functional
Boxplots visualize the statistical distribution of the
spectral data. The Spectrum Explor-er improves the analysis
of specimens of unknown composition. We demonstrate the
usefulness of our techniques on several use cases.",
month = apr,
journal = "Computer Graphic Forum",
volume = "33",
number = "3",
note = "appeared in June 2014",
issn = "2411-5428",
pages = "91--100",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Froehler_Berhnard_2015_ESM/",
}
@inproceedings{mindek-2015-mc,
title = "Automatized Summarization of Multiplayer Games",
author = "Peter Mindek and Ladislav \v{C}mol\'{i}k and Ivan Viola and
Eduard Gr\"{o}ller and Stefan Bruckner",
year = "2015",
abstract = "We present a novel method for creating automatized gameplay
dramatization of multiplayer video games. The dramatization
serves as a visual form of guidance through dynamic 3D
scenes with multiple foci, typical for such games. Our goal
is to convey interesting aspects of the gameplay by animated
sequences creating a summary of events which occurred during
the game. Our technique is based on processing many cameras,
which we refer to as a flock of cameras, and events captured
during the gameplay, which we organize into a so-called
event graph. Each camera has a lifespan with a certain time
interval and its parameters such as position or look-up
vector are changing over time. Additionally, during its
lifespan each camera is assigned an importance function,
which is dependent on the significance of the structures
that are being captured by the camera. The images captured
by the cameras are composed into a single continuous video
using a set of operators based on cinematographic effects.
The sequence of operators is selected by traversing the
event graph and looking for specific patterns corresponding
to the respective operators. In this way, a large number of
cameras can be processed to generate an informative visual
story presenting the gameplay. Our compositing approach
supports insets of camera views to account for several
important cameras simultaneously. Additionally, we create
seamless transitions between individual selected camera
views in order to preserve temporal continuity, which helps
the user to follow the virtual story of the gameplay.",
month = apr,
isbn = "978-80-223-3844-8",
publisher = "Comenius University, Bratislava",
location = "Smolenice, Slovakia",
editor = "Joaquim Jorge, Luis Paulo Santos, Roman Durikovic",
booktitle = "Proceedings of Spring Conference on Computer Graphics 2015",
pages = "93--100",
keywords = "storytelling, game visualization, animation",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/mindek-2015-mc/",
}
@misc{Ganuza_MJ_2015_AVe,
title = "An\'{a}lisis visual en Geolog\'{i}a",
author = " Mar\'{i}a Luj\'{a}n Ganuza and Gabriela Ferracutti and
Maria Florencia Gargiulo and Silvia Mabel Castro and
Kresimir Matkovic and Ernesto Bjerg and Eduard Gr\"{o}ller",
year = "2015",
abstract = "Los ge\'{o}logos usualmente trabajan con rocas que tienen
edades oscilando entre pocos a miles de millones de años.
Uno de los objetivos es tratar de reconstruir los ambientes
geol\'{o}gicos donde se formaron las rocas y la sucesi\'{o}n
de eventos que las afectaron desde su formaci\'{o}n a fin de
comprender la evoluci\'{o}n geol\'{o}gica de la Tierra,
identificar regiones donde se localizan dep\'{o}sitos
minerales de inter\'{e}s econ\'{o}mico, recursos de
combustibles, etc. Para alcanzar estos objetivos, recolectan
informaci\'{o}n y muestras de rocas y minerales en el campo,
En particular estos \'{u}ltimos son analizados en
laboratorio con instrumentos para obtener datos
geoqu\'{i}micos de minerales, como por ejemplo de los que
conforman el grupo del espinelo. Dada la gran cantidad de
datos generados, los cient\'{i}ficos se ven obligados a
analizar grandes vol\'{u}menes de informaci\'{o}n para
arribar a conclusiones basadas en datos objetivos. El flujo
del trabajo de an\'{a}lisis de los ge\'{o}logos incluye el
uso tedioso de varias herramientas y m\'{e}todos manuales
relativamente complejos y propensos a errores para comparar
diferentes gr\'{a}ficos y tablas. Para mejorarlo, los
integrantes de este proyecto desarrollaron un framework de
an\'{a}lisis visual de datos geol\'{o}gicos. Una
realimentaci\'{o}n muy positiva de los expertos del dominio
sobre \'{e}ste y el gran potencial de mejoramiento motiva
esta l\'{i}nea de trabajo.",
month = apr,
publisher = " Red de Universidades con Carreras en Inform\'{a}tica
(RedUNCI)",
location = "Salta, Argentina",
event = "Workshop de Investigadores en Ciencias de la Computaci\'{o}n
(WICC 2015)",
Conference date = "Poster presented at Workshop de Investigadores en Ciencias
de la Computaci\'{o}n (WICC 2015) (2015-04-16--2015-04-17)",
note = "1--5",
pages = "1 – 5",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Ganuza_MJ_2015_AVe/",
}
@talk{Groeller_Eduard_2015_TCU,
title = "The Certainly Uncertain Uncertainty Talk",
author = "Eduard Gr\"{o}ller",
year = "2015",
event = "Workshop on Parameter space/Uncertainty",
location = "Technische Universit\"{a}t M\"{u}nchen",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Groeller_Eduard_2015_TCU/",
}
@talk{Groeller_Eduard_2015_SMV,
title = "Simplifying Medical Visualization through Sparse Interaction
and Reformation, MICCAI 2015 Tutorial on Advanced Medical
Visualization",
author = "Eduard Gr\"{o}ller",
year = "2015",
abstract = "The concept of curved planar reformation and showed other
applications where it makes sense to reformat data sets.
Here, he gave an example of the left ventricle of the human
heart.",
event = "18th International Conference on Medical Image Computing and
Computer Assisted Intervention",
location = "Munich, Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2015/Groeller_Eduard_2015_SMV/",
}
@article{mindek-2014-mcs,
title = "Managing Spatial Selections with Contextual Snapshots",
author = "Peter Mindek and Eduard Gr\"{o}ller and Stefan Bruckner",
year = "2014",
abstract = "Spatial selections are a ubiquitous concept in
visualization. By localizing particular features, they can
be analyzed and compared in different views. However, the
semantics of such selections often depend on specific
parameter settings and it can be difficult to reconstruct
them without additional information. In this paper, we
present the concept of contextual snapshots as an effective
means for managing spatial selections in visualized data.
The selections are automatically associated with the context
in which they have been created. Contextual snapshots can
also be used as the basis for interactive integrated and
linked views, which enable in-place investigation and
comparison of multiple visual representations of data. Our
approach is implemented as a flexible toolkit with
well-defined interfaces for integration into existing
systems. We demonstrate the power and generality of our
techniques by applying them to several distinct scenarios
such as the visualization of simulation data, the analysis
of historical documents, and the display of anatomical data.",
month = dec,
issn = "1467-8659",
journal = "Computer Graphics Forum",
number = "8",
volume = "33",
pages = "132--144",
keywords = "annotations, spatial selections, visual analytics,
interaction",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/mindek-2014-mcs/",
}
@article{beham-2014-cupid,
title = "Cupid: Cluster-based Exploration of Geometry Generators with
Parallel Coordinates and Radial Trees",
author = "Michael Beham and Wolfgang Herzner and Eduard Gr\"{o}ller
and Johannes Kehrer",
year = "2014",
abstract = "Geometry generators are commonly used in video games and
evaluation systems for computer vision to create geometric
shapes such as terrains, vegetation or airplanes. The
parameters of the generator are often sampled automatically
which can lead to many similar or unwanted geometric shapes.
In this paper, we propose a novel visual exploration
approach that combines the abstract parameter space of the
geometry generator with the resulting 3D shapes in a
composite visualization. Similar geometric shapes are first
grouped using hierarchical clustering and then nested within
an illustrative parallel coordinates visualization. This
helps the user to study the sensitivity of the generator
with respect to its parameter space and to identify invalid
parameter settings. Starting from a compact overview
representation, the user can iteratively drill-down into
local shape differences by clicking on the respective
clusters. Additionally, a linked radial tree gives an
overview of the cluster hierarchy and enables the user to
manually split or merge clusters. We evaluate our approach
by exploring the parameter space of a cup generator and
provide feedback from domain experts.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "20",
number = "12",
issn = "1077-2626",
pages = "1693--1702 ",
keywords = "3D shape analysis, radial trees, hierarchical clustering,
illustrative parallel coordinates, composite visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/beham-2014-cupid/",
}
@article{Groeller_2014_RWA,
title = "Run Watchers: Automatic Simulation-Based Decision Support in
Flood Management",
author = "Artem Konev and J\"{u}rgen Waser and Berhard Sadransky and
Daniel Cornel and Rui A.P. Perdigao and Zsolt Horvath and
Eduard Gr\"{o}ller",
year = "2014",
abstract = "In this paper, we introduce a simulation-based approach to
design protection plans for flood events. Existing solutions
require a lot of computation time for an exhaustive search,
or demand for a time-consuming expert supervision and
steering. We present a faster alternative based on the
automated control of multiple parallel simulation runs. Run
Watchers are dedicated system components authorized to
monitor simulation runs, terminate them, and start new runs
originating from existing ones according to domain-specific
rules. This approach allows for a more efficient traversal
of the search space and overall performance improvements due
to a re-use of simulated states and early termination of
failed runs. In the course of search, Run Watchers generate
large and complex decision trees. We visualize the entire
set of decisions made by Run Watchers using interactive,
clustered timelines. In addition, we present visualizations
to explain the resulting response plans. Run Watchers
automatically generate storyboards to convey plan details
and to justify the underlying decisions, including those
which leave particular buildings unprotected. We evaluate
our solution with domain experts.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "20",
number = "12",
issn = "1077-2626",
booktitle = "IEEE Transactions on Visualization and Computer
Graphics/Proceedings of VAST 2014",
publisher = "IEEE",
pages = "1873--1882",
keywords = "visual evidence, Disaster management, simulation control,
storytelling, decision making",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_2014_RWA/",
}
@article{Groeller_Eduard_2014_TSP,
title = "The Spinel Explorer - Interactive Visual Analysis of Spinel
Group Minerals",
author = " Mar\'{i}a Luj\'{a}n Ganuza and Gabriela Ferracutti and
Maria Florencia Gargiulo and Silvia Mabel Castro and Ernesto
Bjerg and Eduard Gr\"{o}ller and Kresimir Matkovic",
year = "2014",
abstract = "Geologists usually deal with rocks that are up to several
thousand million years old. They try to reconstruct the
tectonic settings where these rocks were formed and the
history of events that affected them through the geological
time. The spinel group minerals provide useful information
regarding the geological environment in which the host rocks
were formed. They constitute excellent indicators of
geological environments (tectonic settings) and are of
invaluable help in the search for mineral deposits of
economic interest. The current workflow requires the
scientists to work with different applications to analyze
spine data. They do use specific diagrams, but these are
usually not interactive. The current workflow hinders domain
experts to fully exploit the potentials of tediously and
expensively collected data. In this paper, we introduce the
Spinel Explorer-an interactive visual analysis application
for spinel group minerals. The design of the Spinel Explorer
and of the newly introduced interactions is a result of a
careful study of geologists' tasks. The Spinel Explorer
includes most of the diagrams commonly used for analyzing
spinel group minerals, including 2D binary plots, ternary
plots, and 3D Spinel prism plots. Besides specific plots,
conventional information visualization views are also
integrated in the Spinel Explorer. All views are interactive
and linked. The Spinel Explorer supports conventional
statistics commonly used in spinel minerals exploration. The
statistics views and different data derivation techniques
are fully integrated in the system. Besides the Spinel
Explorer as newly proposed interactive exploration system,
we also describe the identified analysis tasks, and propose
a new workflow. We evaluate the Spinel Explorer using
real-life data from two locations in Argentina: the Frontal
Cordillera in Central Andes and Patagonia. We describe the
new findings of the geologists which would have been much
more difficult to achieve using the cur- ent workflow only.
Very positive feedback from geologists confirms the
usefulness of the Spinel Explorer.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "20",
number = "12",
issn = "1077-2626",
pages = "1913--1922",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_Eduard_2014_TSP/",
}
@inproceedings{ymca,
title = "YMCA - Your Mesh Comparison Application",
author = "Johanna Schmidt and Reinhold Preiner and Thomas Auzinger and
Michael Wimmer and Eduard Gr\"{o}ller and Stefan Bruckner",
year = "2014",
abstract = "Polygonal meshes can be created in several different ways.
In this paper we focus on the reconstruction of meshes from
point clouds, which are sets of points in 3D. Several
algorithms that tackle this task already exist, but they
have different benefits and drawbacks, which leads to a
large number of possible reconstruction results (i.e.,
meshes). The evaluation of those techniques requires
extensive comparisons between different meshes which is up
to now done by either placing images of rendered meshes
side-by-side, or by encoding differences by heat maps. A
major drawback of both approaches is that they do not scale
well with the number of meshes. This paper introduces a new
comparative visual analysis technique for 3D meshes which
enables the simultaneous comparison of several meshes and
allows for the interactive exploration of their differences.
Our approach gives an overview of the differences of the
input meshes in a 2D view. By selecting certain areas of
interest, the user can switch to a 3D representation and
explore the spatial differences in detail. To inspect local
variations, we provide a magic lens tool in 3D. The location
and size of the lens provide further information on the
variations of the reconstructions in the selected area. With
our comparative visualization approach, differences between
several mesh reconstruction algorithms can be easily
localized and inspected.",
month = nov,
series = "VAST ",
publisher = "IEEE Computer Society",
note = "http://dx.doi.org/10.1109/VAST.2014.7042491",
location = "Paris, France",
booktitle = "IEEE Visual Analytics Science and Technology",
keywords = "mesh comparison, 3D data exploration, focus+context,
comparative visualization, Visual analysis",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/ymca/",
}
@misc{fmistelbauer-2014-adict,
title = "ActiveDICOM - Enhancing Static Medical Images with
Interaction",
author = "Florian Mistelbauer and Gabriel Mistelbauer and Eduard
Gr\"{o}ller",
year = "2014",
abstract = "Digital Imaging and Communications in Medicine (DICOM) is a
well-establish standard in medical imaging, consisting not
only of image data, but sensitive data such as patient and
examination information. Nowadays, although having a large
variety of advanced rendering techniques available, DICOM
images are still generated and sent to the Picture Archiving
and Communication System (PACS). These images are then
fetched by the medical doctor from a workstation and used
for medical reporting. The user has no other possibilities
than being able to change the windowing function for
displaying the DICOM images. If a certain region is of
special interest, either images of the whole data set are
generated or have to be specifically requested. Both
approaches consume a considerable amount of time. Secondly,
the image generation on demand remains pending until done by
the responsible assistant. Despite supporting a broad range
of features and being widely applied, DICOM images remain
static. We propose a visualization mapping language, Active
DICOM Script (ADICT), which enhances conventional DICOM with
interactive elements by combining heterogeneous data,
interaction and visualization. Such DICOM images are then
called Active Digital Imaging and Communications in Medicine
(ActiveDICOM).",
month = sep,
series = "EG VCBM 2014",
location = "Vienna, Austria",
event = "Eurographics Workshop on Visual Computing for Biology and
Medicine",
booktitle = "Posters at Eurographics Workshop on Visual Computing for
Biology and Medicine",
Conference date = "Poster presented at Eurographics Workshop on Visual
Computing for Biology and Medicine (2014-09-03--2014-09-05)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/fmistelbauer-2014-adict/",
}
@article{Rautek_Peter_2014_TUC,
title = "Towards an Unbiased Comparison of CC, BCC, and FCC Lattices
in Terms of Prealiasing",
author = "Viktor Vad and Bal\'{a}zs Cs\'{e}bfalvi and Peter Rautek and
Eduard Gr\"{o}ller",
year = "2014",
abstract = "In the literature on optimal regular volume sampling, the
Body-Centered Cubic (BCC) lattice has been proven to be
optimal for sampling spherically band-limited signals above
the Nyquist limit. On the other hand, if the sampling
frequency is below the Nyquist limit, the Face-Centered
Cubic (FCC) lattice was demonstrated to be optimal in
reducing the prealiasing effect. In this paper, we confirm
that the FCC lattice is indeed optimal in this sense in a
certain interval of the sampling frequency. By theoretically
estimating the prealiasing error in a realistic range of the
sampling frequency, we show that in other frequency
intervals, the BCC lattice and even the traditional
Cartesian Cubic (CC) lattice are expected to minimize the
prealiasing. The BCC lattice is superior over the FCC
lattice if the sampling frequency is not significantly below
the Nyquist limit. Interestingly, if the original signal is
drastically undersampled, the CC lattice is expected to
provide the lowest prealiasing error. Additionally, we give
a comprehensible clarification that the sampling efficiency
of the FCC lattice is lower than that of the BCC lattice.
Although this is a well-known fact, the exact percentage has
been erroneously reported in the literature. Furthermore,
for the sake of an unbiased comparison, we propose to rotate
the Marschner-Lobb test signal such that an undue advantage
is not given to either lattice.",
month = jun,
journal = "Computer Graphics Forum",
volume = "33",
number = "3",
pages = "81--90",
keywords = " Image representation—Volumetric, Picture/Image
Generation—Display algorit, Categories and Subject
Descriptors",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Rautek_Peter_2014_TUC/",
}
@article{Groeller_2014_UPS,
title = "Guest editorial—Uncertainty and parameter space analysis
in visualization",
author = "Christoph Heinzl and Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2014",
abstract = "Within the past decades visualization advanced to a powerful
means of exploring and analyzing data. Recent developments
in both hard- and software contributed to previously
unthinkable evaluations and visualizations of data with
strongly increasing sizes and levels of complexity.
Providing just insight into available data of a problem
seems not to be sufficient anymore: Uncertainty and
parameter space analyses in visualization are becoming more
prevalent and may be found in astronomic, (bio)-medical,
industrial, and engineering applications. The major goal is
to find out, at which stage of the pipeline - from data
acquisition to the final rendering of the output image - how
much uncertainty is introduced and consequently how the
desired result (e.g., a dimensional measurement feature) is
affected. Therefore effective methods and techniques are
required by domain specialists, which help to understand how
data is generated, how reliable is the generated data, and
where and why data is uncertain. Furthermore, as the
problems to investigate are becoming increasingly complex,
also finding suitable algorithms providing the desired
solution tends to be more difficult. Additional questions
may arise, e.g., how does a slight parameter change modify
the result, how stable is a parameter, in which range is a
parameter stable or which parameter set is optimal for a
specific problem. Metaphorically speaking, an algorithm for
solving a problem may be seen as finding a path through some
rugged terrain (the core problem) ranging from the high
grounds of theory to the haunted swamps of heuristics. There
are many different paths through this terrain with different
levels of comfort, length, and stability. Finding all
possible paths corresponds in our case to doing an analysis
of all possible parameters of a problem solving algorithm,
which yields a typically multi-dimensional parameter space.
This parameter space allows for an analysis of the quality
and stability of a specific parameter set. In many cases of
conventional visualization approaches the issues of
uncertainty and parameter space analyses are neglected. For
a long time, uncertainty - if visualized at all - used to be
depicted as blurred data. But in most cases the uncertainty
in the base data is not considered at all and just the
quantities of interest are calculated. And even to calculate
these quantities of interest, too often an empirically found
parameter set is used to parameterize the underlying
algorithms without exploring its sensitivity to changes and
without exploring the whole parameter space to find the
global or a local optimum. This tutorial aims to open minds
and to look at our data and the parameter sets of our
algorithms with a healthy skepticism. In the tutorial we
combine uncertainty visualization and parameter space
analyses which we believe is essential for the acceptance
and applicability of future algorithms and techniques. The
tutorial provides six sessions starting with an overview of
uncertainty visualization including a historical
perspective, uncertainty modeling and statistical
visualization. The second part of the tutorial will be
dedicated to structural uncertainty, parameter space
analysis, industrial applications of uncertainty
visualization and an outlook in this domain. ",
month = jun,
journal = "Computer & Graphics",
volume = "41",
pages = "A1--A2",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_2014_UPS/",
}
@article{amirkhanov-2014-ama,
title = "InSpectr: Multi-Modal Exploration, Visualization, and
Analysis of Spectral Data",
author = "Artem Amirkhanov and Bernhard Fr\"{o}hler and Johann Kastner
and Eduard Gr\"{o}ller and Christoph Heinzl",
year = "2014",
abstract = "This paper addresses the increasing demand in industry for
methods to analyze and visualize multimodal data involving a
spectral modality. Two data modalities are used:
high-resolution X-ray computed tomography (XCT) for
structural characterization and low-resolution X-ray
fluorescence (XRF) spectral data for elemental
decomposition. We present InSpectr, an integrated tool for
the interactive exploration and visual analysis of
multimodal, multiscalar data. The tool has been designed
around a set of tasks identified by domain experts in the
fields of XCT and XRF. It supports registered single scalar
and spectral datasets optionally coupled with element maps
and reference spectra. InSpectr is instantiating various
linked views for the integration of spatial and non-spatial
information to provide insight into an industrial
component’s structural and material composition: views
with volume renderings of composite and individual 3D
element maps visualize global material composition; transfer
functions defined directly on the spectral data and overlaid
pie-chart glyphs show elemental composition in 2D
slice-views; a representative aggregated spectrum and
spectra density histograms are introduced to provide a
global overview in the spectral view. Spectral magic lenses,
spectrum probing and elemental composition probing of points
using a pie-chart view and a periodic table view aid the
local material composition analysis. Two datasets are
investigated to outline the usefulness of the presented
techniques: a 3D virtually created phantom with a brass
metal alloy and a real-world 2D water phantom with
insertions of gold, barium, and gadolinium. Additionally a
detailed user evaluation of the results is provided.",
month = jun,
journal = "Computer Graphics Forum",
volume = "33",
number = "3",
note = "Article first published online: 12 JUL 2014",
pages = "91--100",
keywords = "multi-modal data, XRF, industrial computed tomography,
linked views, spectral data",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/amirkhanov-2014-ama/",
}
@inproceedings{weissenboeck-2014,
title = "FiberScout: An Interactive Tool for Exploring and Analyzing
Fiber Reinforced Polymers",
author = "Johannes Weissenb\"{o}ck and Artem Amirkhanov and Weimin Li
and Andreas Reh and Aleksandr Amirkhanov and Eduard
Gr\"{o}ller and Johann Kastner and Christoph Heinzl",
year = "2014",
abstract = "Advanced composites such as fiber reinforced polymers are
promising candidate materials for future components as they
allow integrating the continuously rising demands of
industry regarding costeffectiveness, function-orientation,
integration and weight. The most important structures of
fiber reinforced polymers are the individual fibers, as
their characteristics (stiffness, strength, ductility,
durability, etc.) to a large extent determine the properties
of the final component. The main contribution of this paper
is the introduction of a new system for interactive
exploration and visual analysis of fiber properties in X-ray
computed tomography data of fiber reinforced polymers. The
presented tool uses parallel coordinates to define and
configure initial fiber classes. Using a scatter plot matrix
linked to the parallel coordinates the initial
classification may be refined. This allows to analyze hidden
relationships between individual fiber properties. 2D and 3D
views depict the resulting fiber classifications. By using
polar plots an intuitive rendering of the fiber orientation
distribution is provided. In addition, two modules of higher
abstraction are proposed: The Blob visualization creates a
hull around fibers with similar characteristics. The fiber
metadata visualization allows to calculate overlays for 2D
and 3D views containing regional information of particular
material characteristics. The proposed system has been
evaluated by two groups of domain experts. Applying the
presented concepts the user feedback shows that the domain
experts are now able to efficiently perform tasks as
classification of fibers, visualization of fiber lengths and
orientations, and visualization of fiber regions. The
insights gained can be forwarded to the design office as
well as to material development and simulation, in order to
speed up the development of novel composite components.",
month = mar,
isbn = "978-1-4799-2874-3 ",
publisher = "IEEE Computer Society",
location = "Yokohama",
booktitle = "Proceedings of 2014 IEEE Pacific Visualization Symposium
(PacificVis) (2014)",
pages = "153--160",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/weissenboeck-2014/",
}
@inproceedings{Groeller_Eduard_2014_UCT,
title = "Uncertainty in CT Metrology: Visualizations for Exploration
and Analysis of Geometric Tolerances",
author = "Artem Amirkhanov and Bernhard Fr\"{o}hler and Michael Reiter
and Johann Kastner and Eduard Gr\"{o}ller and Christoph
Heinzl",
year = "2014",
abstract = "Industrial 3D X-ray computed tomography (3DXCT) is
increasingly applied as a technique for metrology
applications. In contrast to comventional metrology tools
such as coordinate measurement machines (CMMs). 3DXCT only
estimates the exact position of the specimen’s surface and
is subjected to a specific set of artifact types. These
factors result in uncertainty that is present in the data.
Previous work by Amirkhanov et. al [2] presented a tool
prototype that is taking such uncertainty into account when
measuring geometric tolerances such as straightness,
circularity, or flatness. In this paper we extend the
previous work with two more geometric tolerance types:
cylindricity and angularity. We provide methods and tools
for visualization, inspection, and analysis of these
tolerances. For the cylindricity tolerance we employ
neighboring profiles visualization, box-plot overview, and
interactive 3D view. We evaluate applicability and
usefulness our methods on a new TP03 data set, and present
results and new potential use cases.",
month = feb,
location = "Wels, Austria",
issn = "978-3-8440-2557-6",
event = "iCT Conference 2014",
booktitle = "Proceedings of 5th Conference on Industrial Computed
Tomography (iCT Conference 2014)",
journal = "Proceedings of iCT 2014",
pages = "189--195",
keywords = "metrology, level-of-details, uncertainty visualization,
Industrial 3D computed tomography",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_Eduard_2014_UCT/",
}
@talk{Groeller_2014_CQV,
title = "Comparative and Quantitative Visualization in Material
Sciences",
author = "Eduard Gr\"{o}ller",
year = "2014",
event = "Seminar 14231, Scientific Visualization, Dagstuhl",
location = "Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_2014_CQV/",
}
@incollection{Groeller_Eduard_2014_THS,
title = "The Haunted Swamps of Heuristics: Uncertainty in Problem
Solving",
author = "Artem Amirkhanov and Stefan Bruckner and Christoph Heinzl
and Eduard Gr\"{o}ller",
year = "2014",
abstract = "In scientific visualization the key task of research is the
provision of insight into a problem. Finding the solution to
a problem may be seen as finding a path through some rugged
terrain which contains mountains, chasms, swamps, and few
flatlands. This path—an algorithm discovered by the
researcher—helps users to easily move around this unknown
area. If this way is a wide road paved with stones it will
be used for a long time by many travelers. However, a narrow
footpath leading through deep forests and deadly swamps will
attract only a few adventure seekers. There are many
different paths with different levels of comfort, length,
and stability, which are uncertain during the research
process. Finding a systematic way to deal with this
uncertainty can greatly assist the search for a safe path
which is in our case the development of a suitable
visualization algorithm for a specific problem. In this work
we will analyze the sources of uncertainty in heuristically
solving visualization problems and will propose directions
to handle these uncertainties.",
booktitle = "Scientific Visualization",
chapter = "Uncertainty, Multifield, Biomedical, and Scalable
Visualization",
editor = "Charles D. Hansen, Min Chen, Christopher R. Johnson, Arie E.
Kaufman, Hans Hagen",
isbn = "978-1-4471-6496-8",
note = "Chapter 5",
publisher = "Springer London",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_Eduard_2014_THS/",
}
@article{Rautek_Peter_2014_VSA,
title = "ViSlang: A System for Interpreted Domain-Specific Languages
for Scientific Visualization",
author = "Peter Rautek and Stefan Bruckner and Eduard Gr\"{o}ller and
Markus Hadwiger",
year = "2014",
abstract = "Researchers from many domains use scientific visualization
in their daily practice. Existing implementations of
algorithms usually come with a graphical user interface
(high-level interface), or as software library or source
code (low-level interface). In this paper we present a
system that integrates domain-specific languages (DSLs) and
facilitates the creation of new DSLs. DSLs provide an
effective interface for domain scientists avoiding the
difficulties involved with low-level interfaces and at the
same time offering more flexibility than high-level
interfaces. We describe the design and implementation of
ViSlang, an interpreted language specifically tailored for
scientific visualization. A major contribution of our design
is the extensibility of the ViSlang language. Novel DSLs
that are tailored to the problems of the domain can be
created and integrated into ViSlang. We show that our
approach can be added to existing user interfaces to
increase the flexibility for expert users on demand, but at
the same time does not interfere with the user experience of
novice users. To demonstrate the flexibility of our approach
we present new DSLs for volume processing, querying and
visualization. We report the implementation effort for new
DSLs and compare our approach with Matlab and Python
implementations in terms of run-time performance.",
issn = "1077-2626",
journal = "IEEE Transactions on Visualization and Computer Graphics",
number = "12",
volume = "20",
pages = "2388--2396",
keywords = " Volume visualization framework , Volume visualization,
Domain-specific languages",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Rautek_Peter_2014_VSA/",
}
@talk{Groeller_2014_CaQ,
title = "Comparative and Quantitative Visualization in Material
Sciences",
author = "Eduard Gr\"{o}ller",
year = "2014",
event = "Keynote talk at INFORMATIK 2014 Workshop Big Data Visual
Computing - Quantitative Perspectives for Visual Computing",
location = "Stuttgart, Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_2014_CaQ/",
}
@talk{Groeller_2014_CV,
title = "Comparative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2014",
abstract = "Visualization uses computer-supported, interactive, visual
representations of (abstract) data to amplify cognition. In
recent years data complexity and variability has increased
considerably. This is due to new data sources as well as the
availability of uncertainty, error and tolerance
information. Instead of individual objects entire sets,
collections, and ensembles are visually investigated. This
raises the need for effective comparative visualization
approaches. Visual data science and computational sciences
provide vast amounts of digital variations of a phenomenon
which can be explored through superposition, juxtaposition
and explicit difference encoding. A few examples of
comparative approaches coming from the various areas of
visualization, i.e., scientific visualization, information
visualization and visual analytics will be treated in more
detail. Comparison and visualization techniques are helpful
to carry out parameter studies for the special application
area of non-destructive testing using 3D X-ray computed
tomography (3DCT). We discuss multi-image views and an edge
explorer for comparing and visualizing gray value slices and
edges of several datasets simultaneously. Visual steering
supports decision making in the presence of alternative
scenarios. Multiple, related simulation runs are explored
through branching operations. To account for uncertain
knowledge about the input parameters, visual reasoning
employs entire parameter distributions. This can lead to an
uncertainty-aware exploration of (continuous) parameter
spaces. VAICo, i.e., Visual Analysis for Image Comparison,
depicts differences and similarities in large sets of
images. It preserves contextual information, but also allows
the user a detailed analysis of subtle variations. The
approach identifies local changes and applies cluster
analysis techniques to embed them in a hierarchy. The
results of this comparison process are then presented in an
interactive web application which enables users to rapidly
explore the space of differences and drill-down on
particular features. Given the amplified data variability,
comparative visualization techniques are likely to gain in
importance in the future. Research challenges, directions,
and issues concerning this innovative area are sketched at
the end of the talk.",
event = "IEEE Pacific Visualization Symposium (PacificVis)2014",
location = "Yokohama, Japan",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_2014_CV/",
}
@talk{Groeller_2014_STC,
title = "Selected Topics in Comparative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2014",
event = "Science Meeting of Visual Computing Center",
location = "KAUST, Thuwal, Saudi Arabia",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_2014_STC/",
}
@talk{Groeller_2014_VND,
title = "Visualization for Non-Destructive Testing",
author = "Eduard Gr\"{o}ller",
year = "2014",
event = "NII Shonan Meeting Seminar 046 (Computer Visualization –
Concepts and Challenges)",
location = "Hayama Miura-gun, Kanagawa, Japan",
URL = "https://www.cg.tuwien.ac.at/research/publications/2014/Groeller_2014_VND/",
}
@article{kehrer-2013-SBC,
title = "A Model for Structure-based Comparison of Many Categories in
Small-Multiple Displays",
author = "Johannes Kehrer and Harald Piringer and Wolfgang Berger and
Eduard Gr\"{o}ller",
year = "2013",
abstract = "Many application domains deal with multi-variate data that
consists of both categorical and numerical information.
Small-multiple displays are a powerful concept for comparing
such data by juxtaposition. For comparison by overlay or by
explicit encoding of computed differences, however, a
specification of references is necessary. In this paper, we
present a formal model for defining semantically meaningful
comparisons between many categories in a small-multiple
display. Based on pivotized data that are hierarchically
partitioned by the categories assigned to the x and y axis
of the display, we propose two alternatives for
structure-based comparison within this hierarchy. With an
absolute reference specification, categories are compared to
a fixed reference category. With a relative reference
specification, in contrast, a semantic ordering of the
categories is considered when comparing them either to the
previous or subsequent category each. Both reference
specifications can be defined at multiple levels of the
hierarchy (including aggregated summaries), enabling a
multitude of useful comparisons. We demonstrate the general
applicability of our model in several application examples
using different visualizations that compare data by overlay
or explicit encoding of differences.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "19",
number = "12",
pages = "2287--2296",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/kehrer-2013-SBC/",
}
@article{vaico,
title = "VAICo: Visual Analysis for Image Comparison",
author = "Johanna Schmidt and Eduard Gr\"{o}ller and Stefan Bruckner",
year = "2013",
abstract = "Scientists, engineers, and analysts are confronted with ever
larger and more complex sets of data, whose analysis poses
special challenges. In many situations it is necessary to
compare two or more datasets. Hence there is a need for
comparative visualization tools to help analyze differences
or similarities among datasets. In this paper an approach
for comparative visualization for sets of images is
presented. Well-established techniques for comparing images
frequently place them side-by-side. A major drawback of such
approaches is that they do not scale well. Other image
comparison methods encode differences in images by abstract
parameters like color. In this case information about the
underlying image data gets lost. This paper introduces a new
method for visualizing differences and similarities in large
sets of images which preserves contextual information, but
also allows the detailed analysis of subtle variations. Our
approach identifies local changes and applies cluster
analysis techniques to embed them in a hierarchy. The
results of this process are then presented in an interactive
web application which allows users to rapidly explore the
space of differences and drill-down on particular features.
We demonstrate the flexibility of our approach by applying
it to multiple distinct domains.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "19",
number = "12",
note = "Demo: http://www.cg.tuwien.ac.at/~jschmidt/vaico/",
pages = "2090--2099",
keywords = "focus+context, image-set comparison, Comparative
visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/vaico/",
}
@article{reh-2013,
title = "MObjects - A Novel Method for the Visualization and
Interactive Exploration of Defects in Industrial XCT Data",
author = "Andreas Reh and Christian Gusenbauer and Johann Kastner and
Eduard Gr\"{o}ller and Christoph Heinzl",
year = "2013",
abstract = "This paper describes an advanced visualization method for
the analysis of defects in industrial 3D X-Ray Computed
Tomography (XCT) data. We present a novel way to explore a
high number of individual objects in a dataset, e.g., pores,
inclusions, particles, fibers, and cracks demonstrated on
the special application area of pore extraction in carbon
fiber reinforced polymers (CFRP). After calculating the
individual object properties volume, dimensions and shape
factors, all objects are clustered into a mean object
(MObject). The resulting MObject parameter space can be
explored interactively. To do so, we introduce the
visualization of mean object sets (MObject Sets) in a radial
and a parallel arrangement. Each MObject may be split up
into sub-classes by selecting a specific property, e.g.,
volume or shape factor, and the desired number of classes.
Applying this interactive selection iteratively leads to the
intended classifications and visualizations of MObjects
along the selected analysis path. Hereby the given different
scaling factors of the MObjects down the analysis path are
visualized through a visual linking approach. Furthermore
the representative MObjects are exported as volumetric
datasets to serve as input for successive calculations and
simulations. In the field of porosity determination in CFRP
non-destructive testing practitioners use representative
MObjects to improve ultrasonic calibration curves.
Representative pores also serve as input for heat conduction
simulations in active thermography. For a fast overview of
the pore properties in a dataset we propose a local MObjects
visualization in combination with a color-coded homogeneity
visualization of cells. The advantages of our novel approach
are demonstrated using real world CFRP specimens. The
results were evaluated through a questionnaire in order to
determine the practicality of the MObjects visualization as
a supportive tool for domain specialists.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics
(Proceedings of IEEE Scientific Visualization 2013)",
volume = "19",
number = "12",
pages = "2906--2915",
keywords = "porosity, carbon fiber reinforced polymers, parameter space
analysis, MObjects, 3D X-ray computed tomography",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/reh-2013/",
}
@article{Auzinger_Mistelbauer_2013_CSR,
title = "Vessel Visualization using Curved Surface Reformation",
author = "Thomas Auzinger and Gabriel Mistelbauer and Ivan Baclija and
R\"{u}diger Schernthaner and Arnold K\"{o}chl and Michael
Wimmer and Eduard Gr\"{o}ller and Stefan Bruckner",
year = "2013",
abstract = "Visualizations of vascular structures are frequently used in
radiological investigations to detect and analyze vascular
diseases. Obstructions of the blood flow through a vessel
are one of the main interests of physicians, and several
methods have been proposed to aid the visual assessment of
calcifications on vessel walls. Curved Planar Reformation
(CPR) is a wide-spread method that is designed for
peripheral arteries which exhibit one dominant direction. To
analyze the lumen of arbitrarily oriented vessels,
Centerline Reformation (CR) has been proposed. Both methods
project the vascular structures into 2D image space in order
to reconstruct the vessel lumen. In this paper, we propose
Curved Surface Reformation (CSR), a technique that computes
the vessel lumen fully in 3D. This offers high-quality
interactive visualizations of vessel lumina and does not
suffer from problems of earlier methods such as ambiguous
visibility cues or premature discretization of centerline
data. Our method maintains exact visibility information
until the final query of the 3D lumina data. We also present
feedback from several domain experts.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics
(Proceedings of IEEE Scientific Visualization 2013)",
volume = "19",
number = "12",
pages = "2858--2867",
keywords = "Surface Approximation, Vessel, Reformation, Volume Rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/Auzinger_Mistelbauer_2013_CSR/",
}
@misc{diehl-2013-VTA,
title = "Visual Trend Analysis in Weather Forecast",
author = "Alexandra Diehl and Stefan Bruckner and Eduard Gr\"{o}ller
and Claudio Delrieux and Celeste Saulo",
year = "2013",
abstract = "Weather conditions affect multiple aspects of human life
such as economy, safety, security, and social activities.
Weather forecast significantly influences decision and
policy making, construction planning, productivity, and
environmental risk management. Visualization of weather
conditions and trends assists the anticipation of unexpected
meteorological events and thus helps with appropriate
actions and mitigation systems to minimize the impact of
them on human life and activities. In this work, we propose
an interactive approach for visual analysis of weather
trends and forecast errors in short-term weather forecast
simulations. Our solution consists of a multi-aspect system
that provides different methods to visualize and analyze
multiple runs, time-dependent data, and forecast errors. A
key contribution of this work is the comparative
visualization technique that allows users to analyze
possible weather trends and patterns. We illustrate the
usage of our approach with a case study designed and
validated in conjunction with domain experts.",
month = oct,
location = "Atlanta, Georgia, USA",
event = "IEEE VIS 2013 Conference",
Conference date = "Poster presented at IEEE VIS 2013 Conference
(2013-10-13--2013-10-18)",
keywords = "Interactive Visual Analysis, Comparative Visualization,
Weather Forecast Research",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/diehl-2013-VTA/",
}
@article{mistelbauer-2013-cfa,
title = "Vessel Visualization using Curvicircular Feature Aggregation",
author = "Gabriel Mistelbauer and Anca Morar and Andrej Varchola and
R\"{u}diger Schernthaner and Ivan Baclija and Arnold
K\"{o}chl and Armin Kanitsar and Stefan Bruckner and Eduard
Gr\"{o}ller",
year = "2013",
abstract = "Radiological investigations are common medical practice for
the diagnosis of peripheral vascular diseases. Existing
visualization methods such as Curved Planar Reformation
(CPR) depict calcifications on vessel walls to determine if
blood is still able to flow. While it is possible with
conventional CPR methods to examine the whole vessel lumen
by rotating around the centerline of a vessel, we propose
Curvicircular Feature Aggregation (CFA), which aggregates
these rotated images into a single view. By eliminating the
need for rotation, vessels can be investigated by inspecting
only one image. This method can be used as a guidance and
visual analysis tool for treatment planning. We present
applications of this technique in the medical domain and
give feedback from radiologists.",
month = jun,
journal = "Computer Graphics Forum",
volume = "32",
number = "3",
pages = "231--240",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/mistelbauer-2013-cfa/",
}
@article{karimov-2013-vivisection,
title = "ViviSection: Skeleton-based Volume Editing",
author = "Alexey Karimov and Gabriel Mistelbauer and Johanna Schmidt
and Peter Mindek and Elisabeth Schmidt and Timur Sharipov
and Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2013",
abstract = "Volume segmentation is important in many applications,
particularly in the medical domain. Most segmentation
techniques, however, work fully automatically only in very
restricted scenarios and cumbersome manual editing of the
results is a common task. In this paper, we introduce a
novel approach for the editing of segmentation results. Our
method exploits structural features of the segmented object
to enable intuitive and robust correction and verification.
We demonstrate that our new approach can significantly
increase the segmentation quality even in difficult cases
such as in the presence of severe pathologies.",
month = jun,
journal = "Computer Graphics Forum",
volume = "32",
number = "3",
pages = "461--470",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/karimov-2013-vivisection/",
}
@inproceedings{mindek-2013-csl,
title = "Contextual Snapshots: Enriched Visualization with
Interactive Spatial Annotations",
author = "Peter Mindek and Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2013",
abstract = "Spatial selections are a ubiquitous concept in
visualization. By localizing particular features, they can
be analyzed and compared in different views. However, the
semantics of such selections are often dependent on other
parameter settings and it can be difficult to reconstruct
them without additional information. In this paper, we
present the concept of contextual snapshots as an effective
means for managing spatial selections in visualized data.
The selections are automatically associated with the context
in which they have been created. Contextual snapshots can be
also used as the basis for interactive integrated and linked
views, which enable in-place investigation and comparison of
multiple visual representations of data. Our approach is
implemented as a flexible toolkit with welldefined
interfaces for integration into existing systems. We
demonstrate the power and generality of our techniques by
applying them to several distinct scenarios such as the
visualization of simulation data and the analysis of
historical documents.",
month = may,
series = "SCCG ",
location = "Smolenice, Slovakia",
booktitle = "Proceedings of the 29th Spring Conference on Computer
Graphics",
keywords = "spatial selections, annotations, linked views, provenance",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/mindek-2013-csl/",
}
@inproceedings{amirkhanov_2013_AMA,
title = "Fuzzy CT Metrology: Dimensional Measurements on Uncertain
Data",
author = "Artem Amirkhanov and Christoph Heinzl and Christoph Kuhn and
Johann Kastner and Eduard Gr\"{o}ller",
year = "2013",
abstract = "Metrology through geometric dimensioning and tolerancing is
an important instrument applied for industrial manufacturing
and quality control. Typically tactile or optical coordinate
measurement machines (CMMs) are used to perform dimensional
measurements. In recent years industrial 3D X-ray computed
tomography (3DXCT) has been increasingly applied for
metrology due to the development of XCT systems with higher
accuracy and their ability to capture both internal and
external structures of a specimen within one scan. Using
3DXCT the location of the specimen surface is estimated
based on the scanned attenuation coefficients. As opposed to
tactile or optical measurement techniques, the surface is
not explicit and implies a certain positional uncertainty
depending on artifacts and noise in the scan data and the
used surface extraction algorithm. Moreover, conventional
XCT measurement software does not consider uncertainty in
the data. In this work we present techniques which account
for uncertainty arising in the XCT metrology data flow. Our
technique provides the domain experts with uncertainty
visualizations, which extend the XCT metrology workflow on
different levels. The developed techniques are integrated
into a tool utilizing linked views, smart 3D tolerance
tagging and plotting functionalities. The presented system
is capable of visualizing the uncertainty of measurements on
various levels-of-detail. Commonly known geometric tolerance
indications are provided as smart tolerance tags. Finally,
we incorporate the uncertainty of the data as a context in
commonly used measurement plots. The proposed techniques
provide an augmented insight into the reliability of
geometric tolerances while maintaining the daily workflow of
domain specialists, giving the user additional information
on the nature of areas with high uncertainty. The presented
techniques are evaluated based on domain experts feedback in
collaboration with our company partners.",
month = may,
isbn = "978-80-223-3377-1",
publisher = "Comenius university, Bratislava, Slovakia",
location = "Smolenice, Slovak Republic",
booktitle = "SCCG 2013 - 29th Proceedings Spring conference on Computer
Graphics",
pages = "93--101",
keywords = "metrology, uncertainty visualization, level-of-details,
industrial 3D computed tomography",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/amirkhanov_2013_AMA/",
}
@talk{Groeller_Edi_2013_TVC,
title = "Trends in Visual Computing",
author = "Eduard Gr\"{o}ller",
year = "2013",
event = "CD-adapco Customer Advisory Council Meeting",
location = "Vienna, Austria",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/Groeller_Edi_2013_TVC/",
}
@talk{Groeller_Edi_2013TVCK,
title = "Trends in Visual Computing",
author = "Eduard Gr\"{o}ller",
year = "2013",
event = "Conference on Graphics, Patterns and Images",
location = "Arequipa, Peru",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/Groeller_Edi_2013TVCK/",
}
@article{mindek-2013-pel,
title = "Visual Parameter Exploration in GPU Shader Space",
author = "Peter Mindek and Stefan Bruckner and Peter Rautek and Eduard
Gr\"{o}ller",
year = "2013",
abstract = "The wide availability of high-performance GPUs has made the
use of shader programs in visualization ubiquitous.
Understanding shaders is a challenging task. Frequently it
is dif?cult to mentally reconstruct the nature and types of
transformations applied to the underlying data during the
visualization process. We propose a method for the visual
analysis of GPU shaders, which allows the ?exible
exploration and investigation of algorithms, parameters, and
their effects. We introduce a method for extracting feature
vectors composed of several attributes of the shader, as
well as a direct manipulation interface for assigning
semantics to them. The user interactively classi?es pixels
of images which are rendered with the investigated shader.
The two resulting classes, a positive class and a negative
one, are employed to steer the visualization. Based on this
information, we can extract a wide variety of additional
attributes and visualize their relation to this
classi?cation. Our system allows an interactive exploration
of shader space and we demonstrate its utility for several
different applications.",
journal = "Journal of WSCG",
volume = "21",
number = "3",
issn = "1213-6972",
pages = "225--234",
keywords = "shader augmentation, parameter space exploration",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/mindek-2013-pel/",
}
@talk{Groeller_Edi_2013_VCQ,
title = "Visual Computing - Quo Vadis?",
author = "Eduard Gr\"{o}ller",
year = "2013",
event = "CS-Colloquium of the Faculty of Computer Science",
location = "University of Vienna",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/Groeller_Edi_2013_VCQ/",
}
@talk{Groeller_Edi_VKA,
title = "Visualisation using Knowledge Assisted Sparse Interaction",
author = "Eduard Gr\"{o}ller",
year = "2013",
abstract = "Knowledge-Assisted Visualization: - LiveSync:
Knowledge-Based Navigation - Contextual Picking -
Knowledge-Assisted Sparse Interaction - Semantics Driven
Illustrative Rendering - Smart Super Views",
event = "VIGOR++ Workshop 2013 – Advances in VPH Technologies and
the VIGOR++ Tools",
location = "Academic Medical Center, Amsterdam, The Netherlands",
URL = "https://www.cg.tuwien.ac.at/research/publications/2013/Groeller_Edi_VKA/",
}
@article{Alsallakh_2012_RCW,
title = "Reinventing the Contingency Wheel: Scalable Visual Analytics
of Large Categorical Data",
author = "Bilal Alsallakh and W Aigner and Silvia Miksch and Eduard
Gr\"{o}ller",
year = "2012",
abstract = "Contingency tables summarize the relations between
categorical variables and arise in both scientific and
business domains. Asymmetrically large two-way contingency
tables pose a problem for common visualization methods. The
Contingency Wheel has been recently proposed as an
interactive visual method to explore and analyze such
tables. However, the scalability and readability of this
method are limited when dealing with large and dense tables.
In this paper we present Contingency Wheel++, new visual
analytics methods that overcome these major shortcomings:
(1) regarding automated methods, a measure of association
based on Pearson's residuals alleviates the bias of the raw
residuals originally used, (2) regarding visualization
methods, a frequency-based abstraction of the visual
elements eliminates overlapping and makes analyzing both
positive and negative associations possible, and (3)
regarding the interactive exploration environment, a
multi-level overview+detail interface enables exploring
individual data items that are aggregated in the
visualization or in the table using coordinated views. We
illustrate the applicability of these new methods with a use
case and show how they enable discovering and analyzing
nontrivial patterns and associations in large categorical
data.",
month = dec,
journal = "IEEE Transaction on Visualization and Computer Graphics",
number = "12",
volume = "18",
pages = "2849--2858",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Alsallakh_2012_RCW/",
}
@article{Ribicic_2012_SUS,
title = "Sketching Uncertainty into Simulations",
author = "Hrvoje Ribi\v{c}i\'{c} and J\"{u}rgen Waser and R Gurbat and
Berhard Sadransky and Eduard Gr\"{o}ller",
year = "2012",
abstract = "In a variety of application areas, the use of simulation
steering in decision making is limited at best. Research
focusing on this problem suggests that most user interfaces
are too complex for the end user. Our goal is to let users
create and investigate multiple, alternative scenarios
without the need for special simulation expertise. To
simplify the specification of parameters, we move from a
traditional manipulation of numbers to a sketch-based input
approach. Users steer both numeric parameters and parameters
with a spatial correspondence by sketching a change onto the
rendering. Special visualizations provide immediate visual
feedback on how the sketches are transformed into boundary
conditions of the simulation models. Since uncertainty with
respect to many intertwined parameters plays an important
role in planning, we also allow the user to intuitively
setup complete value ranges, which are then automatically
transformed into ensemble simulations. The interface and the
underlying system were developed in collaboration with
experts in the field of flood management. The real-world
data they have provided has allowed us to construct
scenarios used to evaluate the system. These were presented
to a variety of flood response personnel, and their feedback
is discussed in detail in the paper. The interface was found
to be intuitive and relevant, although a certain amount of
training might be necessary.",
month = dec,
journal = "IEEE Transaction on Visualization and Computer Graphics",
number = "12",
volume = "18",
pages = "2255--2264",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Ribicic_2012_SUS/",
}
@article{Ropinski-2012-UBT,
title = "Unified Boundary-Aware Texturing for Interactive Volume
Rendering",
author = "Timo Ropinski and Stefan Diepenbrock and Stefan Bruckner and
Klaus Hinrichs and Eduard Gr\"{o}ller",
year = "2012",
abstract = "In this paper, we describe a novel approach for applying
texture mapping to volumetric data sets. In contrast to
previous approaches, the presented technique enables a
unified integration of 2D and 3D textures and thus allows to
emphasize material boundaries as well as volumetric regions
within a volumetric data set at the same time. One key
contribution of this paper is a parametrization technique
for volumetric data sets, which takes into account material
boundaries and volumetric regions. Using this technique, the
resulting parametrizations of volumetric data sets enable
texturing effects which create a higher degree of realism in
volume rendered images. We evaluate the quality of the
parametrization and demonstrate the usefulness of the
proposed concepts by combining volumetric texturing with
volumetric lighting models to generate photorealistic volume
renderings. Furthermore, we show the applicability in the
area of illustrative visualization.",
month = nov,
journal = "IEEE Transactions on Visualization and Computer Graphics",
number = "11",
volume = "18",
pages = "1942--1955",
keywords = "interactive volume rendering, volumetric texturing",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Ropinski-2012-UBT/",
}
@inproceedings{Csebfalvi-2012-IOM,
title = "Illumination-Driven Opacity Modulation for Expressive Volume
Rendering",
author = "Bal\'{a}zs Cs\'{e}bfalvi and Bal\'{a}zs T\'{o}th and Stefan
Bruckner and Eduard Gr\"{o}ller",
year = "2012",
abstract = "Using classical volume visualization, typically a couple of
isosurface layers are rendered semi-transparently to show
the internal structures contained in the data. However, the
opacity transfer function is often difficult to specify such
that all the isosurfaces are of high contrast and
sufficiently perceivable. In this paper, we propose a
volumerendering technique which ensures that the different
layers contribute to fairly different regions of the image
space. Since the overlapping between the effected regions is
reduced, an outer translucent isosurface does not decrease
significantly the contrast of a partially hidden inner
isosurface. Therefore, the layers of the data become
visually well separated. Traditional transfer functions
assign color and opacity values to the voxels depending on
the density and the gradient. In contrast, we assign also
different illumination directions to different materials,
and modulate the opacities view-dependently based on the
surface normals and the directions of the light sources,
which are fixed to the viewing angle. We will demonstrate
that this model allows an expressive visualization of
volumetric data.",
month = nov,
location = "Magdeburg, Germany",
booktitle = "Proceedings of Vision, Modeling & Visualization 2012",
pages = "103--109",
keywords = "illustrative visualization, illumination, volume rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Csebfalvi-2012-IOM/",
}
@WorkshopTalk{VisWeek-Tutorial-2012-Uncertainty,
title = "IEEE VisWeek 2012 Tutorial on Uncertainty and Parameter
Space Analysis in Visualization",
author = "Christoph Heinzl and Stefan Bruckner and Eduard Gr\"{o}ller
and Alex Pang and Hans-Christian Hege and Kristin Potter and
R\"{u}diger Westermann and Tobias Pfaffelmoser and Torsten
M\"{o}ller",
year = "2012",
abstract = "Within the past decades visualization advanced to a powerful
means of exploring and analyzing data. Recent developments
in both hard- and software contributed to previously
unthinkable evaluations and visualizations of data with
strongly increasing sizes and levels of complexity.
Providing just insight into available data of a problem
seems not to be sufficient anymore: Uncertainty and
parameter space analyses in visualization are becoming more
prevalent and may be found in astronomic, (bio)-medical,
industrial, and engineering applications. The major goal is
to find out, at which stage of the pipeline - from data
acquisition to the final rendering of the output image - how
much uncertainty is introduced and consequently how the
desired result (e.g., a dimensional measurement feature) is
affected. Therefore effective methods and techniques are
required by domain specialists, which help to understand how
data is generated, how reliable is the generated data, and
where and why data is uncertain. Furthermore, as the
problems to investigate are becoming increasingly complex,
also finding suitable algorithms providing the desired
solution tends to be more difficult. Additional questions
may arise, e.g., how does a slight parameter change modify
the result, how stable is a parameter, in which range is a
parameter stable or which parameter set is optimal for a
specific problem. Metaphorically speaking, an algorithm for
solving a problem may be seen as finding a path through some
rugged terrain (the core problem) ranging from the high
grounds of theory to the haunted swamps of heuristics. There
are many different paths through this terrain with different
levels of comfort, length, and stability. Finding all
possible paths corresponds in our case to doing an analysis
of all possible parameters of a problem solving algorithm,
which yields a typically multi-dimensional parameter space.
This parameter space allows for an analysis of the quality
and stability of a specific parameter set. In many cases of
conventional visualization approaches the issues of
uncertainty and parameter space analyses are neglected. For
a long time, uncertainty - if visualized at all - used to be
depicted as blurred data. But in most cases the uncertainty
in the base data is not considered at all and just the
quantities of interest are calculated. And even to calculate
these quantities of interest, too often an empirically found
parameter set is used to parameterize the underlying
algorithms without exploring its sensitivity to changes and
without exploring the whole parameter space to find the
global or a local optimum. This tutorial aims to open minds
and to look at our data and the parameter sets of our
algorithms with a healthy skepticism. In the tutorial we
combine uncertainty visualization and parameter space
analyses which we believe is essential for the acceptance
and applicability of future algorithms and techniques. The
tutorial provides six sessions starting with an overview of
uncertainty visualization including a historical
perspective, uncertainty modeling and statistical
visualization. The second part of the tutorial will be
dedicated to structural uncertainty, parameter space
analysis, industrial applications of uncertainty
visualization and an outlook in this domain. ",
month = oct,
event = "IEEE VisWeek",
location = "Seattle, WA, USA",
keywords = "uncertainty visualization, parameter space analysis",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/VisWeek-Tutorial-2012-Uncertainty/",
}
@inproceedings{mistelbauer-2012-ssv,
title = "Smart Super Views - A Knowledge-Assisted Interface for
Medical Visualization",
author = "Gabriel Mistelbauer and Hamed Bouzari and R\"{u}diger
Schernthaner and Ivan Baclija and Arnold K\"{o}chl and
Stefan Bruckner and Milo\v{s} \v{S}r\'{a}mek and Eduard
Gr\"{o}ller",
year = "2012",
abstract = "Due to the ever growing volume of acquired data and
information, users have to be constantly aware of the
methods for their exploration and for interaction. Of these,
not each might be applicable to the data at hand or might
reveal the desired result. Owing to this, innovations may be
used inappropriately and users may become skeptical. In this
paper we propose a knowledge-assisted interface for medical
visualization, which reduces the necessary effort to use new
visualization methods, by providing only the most relevant
ones in a smart way. Consequently, we are able to expand
such a system with innovations without the users to worry
about when, where, and especially how they may or should use
them. We present an application of our system in the medical
domain and give qualitative feedback from domain experts.",
month = oct,
publisher = "IEEE Computer Society",
location = "Seattle, WA, USA",
booktitle = "IEEE Conference on Visual Analytics Science and Technology
(IEEE VAST) 2012",
pages = "163--172",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/mistelbauer-2012-ssv/",
}
@inproceedings{Morar_2012_ISB,
title = "Image Segmentation Based on Active Contours without Edges",
author = "Anca Morar and Florica Moldoveanu and Eduard Gr\"{o}ller",
year = "2012",
abstract = "There are a lot of image segmentation techniques that try to
differentiate between background and object pixels, but many
of them fail to discriminate between different objects that
are close to each other. Some image characteristics like low
contrast between background and foreground or inhomogeneity
within the objects increase the difficulty of correctly
segmenting images. We designed a new segmentation algorithm
based on active contours without edges. We also used other
image processing techniques such as nonlinear anisotropic
diffusion and adaptive thresholding in order to overcome the
images’ problems stated above. Our algorithm was tested on
very noisy images, and the results were compared to those
obtained with known methods, like segmentation using active
contours without edges and graph cuts. The new technique led
to very good results, but the time complexity was a
drawback. However, this drawback was significantly reduced
with the use of graphical programming. Our segmentation
method has been successfully integrated in a software
application whose aim is to segment the bones from CT
datasets, extract the femur and produce personalized
prostheses in hip arthroplasty.",
month = aug,
location = "Cluj-Napoca, Romania",
event = "8th IEEE International Conference on Intelligent Computer
Communication and Processing 2012",
booktitle = "IEEE ICCP 2012 - Proceedings",
pages = "213--220",
keywords = "Active contours without edges, image segmentation, nonlinear
anisotropic diffusion, parallel image processing",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Morar_2012_ISB/",
}
@article{PMI_AR_2012,
title = "Porosity Maps – Interactive Exploration and Visual
Analysis of Porosity in Carbon Fiber Reinforced Polymers",
author = "Andreas Reh and B Plank and J Kastner and Eduard Gr\"{o}ller
and Christoph Heinzl",
year = "2012",
abstract = "In this work a novel method for the characterization of
porosity in carbon fiber reinforced polymers (CFRP) is
presented. A visualization pipeline for the interactive
exploration and visual analysis of CFRP specimens is
developed to enhance the evaluation workflow for
non-destructive testing (NDT) practitioners based on
specified tasks. Besides quantitative porosity determination
and the calculation of local pore properties, i.e., volume,
surface, dimensions and shape factors, we employ a
drill-down approach to explore pores in a CFRP specimen. We
introduce Porosity Maps (PM), to allow for a fast porosity
evaluation of the specimen. Pores are filtered in two
stages. First a region of interest is selected in the
porosity maps. Second, pores are filtered with parallel
coordinates according to their local properties. Furthermore
a histogram-based best-viewpoint widget was implemented to
visualize the quality of viewpoints on a sphere. The
advantages of our approach are demonstrated using real world
CFRP specimens. We are able to show that our
visualization-driven approach leads to a better evaluation
of CFRP components than existing reference methods.",
month = jun,
journal = "Computer Graphics Forum,",
volume = "31",
number = "3",
pages = "1185--1194",
keywords = "Interaction Techniques, Methodology and techniques",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/PMI_AR_2012/",
}
@article{Herghelegiu-2012-BPV,
title = "Biopsy Planner - Visual Analysis for Needle Pathway Planning
in Deep Seated Brain Tumor Biopsy",
author = "Paul Herghelegiu and Vasile Manta and Radu Perin and Stefan
Bruckner and Eduard Gr\"{o}ller",
year = "2012",
abstract = "Biopsies involve taking samples from living tissue using a
biopsy needle. In current clinical practice they are a first
mandatory step before any further medical actions are
planned. Performing a biopsy on a deep seated brain tumor
requires considerable time for establishing and validating
the desired biopsy needle pathway to avoid damage. In this
paper, we present a system for the visualization, analysis,
and validation of biopsy needle pathways. Our system uses a
multi-level approach for identifying stable needle
placements which minimize the risk of hitting blood vessels.
This is one of the major dangers in this type of
intervention. Our approach helps in identifying and
visualizing the point on the pathway that is closest to a
surrounding blood vessel, requiring a closer inspection by
the neurosurgeon. An evaluation by medical experts is
performed to demonstrate the utility of our system.",
month = jun,
journal = "Computer Graphics Forum",
volume = "31",
number = "3",
note = "presented at EuroVis 2012",
pages = "1085--1094",
keywords = "biopsy planning, medical visualization, visual analysis",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Herghelegiu-2012-BPV/",
}
@article{Peter_2012_AIV,
title = "Semantics by Analogy for Illustrative Volume Visualization",
author = "Moritz Gerl and Peter Rautek and Tobias Isenberg and Eduard
Gr\"{o}ller",
year = "2012",
abstract = "We present an interactive graphical approach for the
explicit specification of semantics for volume
visualization. This explicit and graphical specification of
semantics for volumetric features allows us to visually
assign meaning to both input and output parameters of the
visualization mapping. This is in contrast to the implicit
way of specifying semantics using transfer functions. In
particular, we demonstrate how to realize a dynamic
specification of semantics which allows to flexibly explore
a wide range of mappings. Our approach is based on three
concepts. First, we use semantic shader augmentation to
automatically add rule-based rendering functionality to
static visualization mappings in a shader program, while
preserving the visual abstraction that the initial shader
encodes. With this technique we extend recent developments
that define a mapping between data attributes and visual
attributes with rules, which are evaluated using fuzzy
logic. Second, we let users define the semantics by analogy
through brushing on renderings of the data attributes of
interest. Third, the rules are specified graphically in an
interface that provides visual clues for potential
modifications. Together, the presented methods offer a high
degree of freedom in the specification and exploration of
rule-based mappings and avoid the limitations of a
linguistic rule formulation.",
month = may,
journal = "Computers & Graphics",
number = "3",
volume = "36",
pages = "201--213",
keywords = "shader augmentation, semantic visualization mapping,
illustrative visualization, Volume rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Peter_2012_AIV/",
}
@article{Ribicic_2012_VAS,
title = "Visual analysis and steering of flooding simulations",
author = "Hrvoje Ribi\v{c}i\'{c} and J\"{u}rgen Waser and Raphael
Fuchs and G\"{u}nter Bl\"{o}schl and Eduard Gr\"{o}ller",
year = "2012",
abstract = "We present a visualization tool for the real-time analysis
of interactively steered ensemble-simulation runs, and apply
it to flooding simulations. Simulations are performed
on-the-fly, generating large quantities of data. The user
wants to make sense of the data as it is created. The tool
facilitates understanding: of what happens in all scenarios,
where important events occur and how simulation runs are
related. We combine different approaches to achieve this
goal. To maintain an overview, data is aggregated and
embedded into the simulation rendering, showing trends,
outliers, and robustness. For a detailed view, we use
information-visualization views and interactive visual
analysis techniques. A selection mechanism connects the two
approaches. Points of interest are selected by clicking on
aggregates, supplying data for visual analysis. This allows
the user to maintain an overview of the ensemble and perform
analysis even as new data is supplied through simulation
steering. Unexpected or unwanted developments are detected
easily, and the user can focus the exploration on them. The
solution was evaluated with two case studies focusing on
placing and testing flood defense measures. Both were
evaluated by a consortium of flood simulation and defense
experts, who found the system to be both intuitive and
relevant.",
journal = "IEEE Transaction on Visualization and Computer Graphics",
number = "99",
volume = "PP",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Ribicic_2012_VAS/",
}
@inproceedings{mistelbauer-2012-cr,
title = "Centerline Reformations of Complex Vascular Structures",
author = "Gabriel Mistelbauer and Andrej Varchola and Hamed Bouzari
and Juraj Starinsky and Arnold K\"{o}chl and R\"{u}diger
Schernthaner and Dominik Fleischmann and Eduard Gr\"{o}ller
and Milo\v{s} \v{S}r\'{a}mek",
year = "2012",
abstract = "Visualization of vascular structures is a common and
frequently performed task in the field of medical imaging.
There exist well established and applicable methods such as
Maximum Intensity Projection (MIP) and Curved Planar
Reformation (CPR). However, when calcified vessel walls are
investigated, occlusion hinders exploration of the vessel
interior with MIP. In contrast, CPR offers the possibility
to visualize the vessel lumen by cutting a single vessel
along its centerline. Extending the idea of CPR, we propose
a novel technique, called Centerline Reformation (CR), which
is capable of visualizing the lumen of spatially arbitrarily
oriented vessels not necessarily connected in a tree
structure. In order to visually emphasize depth, overlap and
occlusion, halos can optionally envelope the vessel lumen.
The required vessel centerlines are obtained from volumetric
data by performing a scale-space based feature extraction.
We present the application of the proposed technique in a
focus and context setup. Further, we demonstrate how it
facilitates the investigation of dense vascular structures,
particularly cervical vessels or vessel data featuring
peripheral arterial occlusive diseases or pulmonary
embolisms. Finally, feedback from domain experts is given.",
isbn = "978-1-4673-0863-2",
location = "Songdo, Korea (South) ",
booktitle = "Pacific Visualization Symposium (PacificVis), 2012 IEEE",
pages = "233--240",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/mistelbauer-2012-cr/",
}
@talk{Groeller_2012_VBP,
title = "Visualization in Biopsy Planning",
author = "Eduard Gr\"{o}ller",
year = "2012",
event = "Medical Visualization Minisymposium, Eindhoven University of
Technology",
location = "The Netherlands",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Groeller_2012_VBP/",
}
@talk{Groeller_2012_VV,
title = " Variability in Visualization",
author = "Eduard Gr\"{o}ller",
year = "2012",
event = "Computer Graphics and HCI Group, Technische Universit\"{a}t
Kaiserslautern",
location = "Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Groeller_2012_VV/",
}
@talk{Groeller_2012_KAV,
title = "Knowledge-Assisted Visualization and Biopsy Planning",
author = "Eduard Gr\"{o}ller",
year = "2012",
event = "Mini-Symposium on Medical Visualization, University of
Bergen",
location = "Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Groeller_2012_KAV/",
}
@talk{Groeller_2012_ViV,
title = "Variability in Visualization",
author = "Eduard Gr\"{o}ller",
year = "2012",
event = "Computer Graphics and Visualization Group, Technische
Universit\"{a}t M\"{u}nchen",
location = "Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2012/Groeller_2012_ViV/",
}
@inproceedings{Soros_AVN_2011,
title = "Augmented Visualization with Natural Feature Tracking",
author = "G\'{a}bor S\"{o}r\"{o}s and Peter Rautek and Hartmut
Seichter and Eduard Gr\"{o}ller",
year = "2011",
abstract = "Visualization systems often require large monitors or
projection screens to display complex information. Even very
sophisticated systems that exhibit complex user interfaces
do usually not exploit advanced input and output devices.
One of the reasons for that is the high cost of special
hardware. This paper introduces Augmen- ted Visualization,
an interaction method for projection walls as well as
monitors using affordable and widely available hardware such
as mobile phones or tablets. The main technical challenge is
the track- ing of the users’ devices without any special
equipment or fiducial markers in the working area. We
propose to track natural features of the display content
with the built-in camera of mobile devices. Tracking the
visualized scene allows pose estimation of the mobile
devices with six degrees of freedom. The position and
orientation information is then used for advanced
interaction metaphors like magic lenses. For a group of
experts who are analyzing the data in front of the same
screen, a personal augmented view of the visua- lized scene
is presented, for each user on his/her personal device. The
prototype Augmented Visualization System achieves
interactive frame rates and may lead to a greatly enhanced
user experience. The paper discusses the design and
implementation questions and illustrates potential
application scenarios.",
month = dec,
isbn = "978-1-4503-1096-3",
publisher = "ACM",
location = "Beijing, China",
event = "10th International Conference on Mobile and Ubiquitous
Multimedia (MUM 2011) ",
booktitle = "Proceedings of the 10th International Conference on Mobile
and Ubiquitous Multimedia (MUM 2011) ",
pages = "4--12",
keywords = "human computer interaction, Handheld augmented reality,
natural feature tracking, interactive visualization systems",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Soros_AVN_2011/",
}
@article{amirkhanov-2011,
title = "Projection-Based Metal-Artifact Reduction for Industrial 3D
X-ray Computed Tomography",
author = "Artem Amirkhanov and Christoph Heinzl and Michael Reiter and
Johann Kastner and Eduard Gr\"{o}ller",
year = "2011",
abstract = "Multi-material components, which contain metal parts
surrounded by plastic materials, are highly interesting for
inspection using industrial 3D X-ray computed tomography
(3DXCT). Examples of this application scenario are
connectors or housings with metal inlays in the electronic
or automotive industry. A major problem of this type of
components is the presence of metal, which causes streaking
artifacts and distorts the surrounding media in the
reconstructed volume. Streaking artifacts and dark-band
artifacts around metal components significantly influence
the material characterization (especially for the plastic
components). In specific cases these artifacts even prevent
a further analysis. Due to the nature and the different
characteristics of artifacts, the development of an
efficient artifact-reduction technique in
reconstruction-space is rather complicated. In this paper we
present a projection-space pipeline for metal-artifacts
reduction. The proposed technique first segments the metal
in the spatial domain of the reconstructed volume in order
to separate it from the other materials. Then metal parts
are forward-projected on the set of projections in a way
that metal-projection regions are treated as voids.
Subsequently the voids, which are left by the removed metal,
are interpolated in the 2D projections. Finally, the metal
is inserted back into the reconstructed 3D volume during the
fusion stage. We present a visual analysis tool, allowing
for interactive parameter estimation of the metal
segmentation. The results of the proposed artifact-reduction
technique are demonstrated on a test part as well as on real
world components. For these specimens we achieve a
significant reduction of metal artifacts, allowing an
enhanced material characterization.",
month = dec,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "17",
number = "12",
issn = "1077-2626",
pages = "2193--2202",
keywords = "Metal-artifact reduction, multi-material components, 3D
X-ray computed tomography, visual analysis",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/amirkhanov-2011/",
}
@article{Groeller_2011_NR,
title = "Nodes on Ropes: A Comprehensive Data and Control Flow for
Steering Ensemble Simulations",
author = "J\"{u}rgen Waser and Hrvoje Ribi\v{c}i\'{c} and Raphael
Fuchs and Christian Hirsch and Benjamin Schindler and
G\"{u}nter Bl\"{o}schl and Eduard Gr\"{o}ller",
year = "2011",
abstract = "Flood disasters are the most common natural risk and
tremendous efforts are spent to improve their simulation and
management. However, simulation-based investigation of
actions that can be taken in case of flood emergencies is
rarely done. This is in part due to the lack of a
comprehensive framework which integrates and facilitates
these efforts. In this paper, we tackle several problems
which are related to steering a flood simulation. One issue
is related to uncertainty. We need to account for uncertain
knowledge about the environment, such as levee-breach
locations. Furthermore, the steering process has to reveal
how these uncertainties in the boundary conditions affect
the confidence in the simulation outcome. Another important
problem is that the simulation setup is often hidden in a
black-box. We expose system internals and show that
simulation steering can be comprehensible at the same time.
This is important because the domain expert needs to be able
to modify the simulation setup in order to include local
knowledge and experience. In the proposed solution, users
steer parameter studies through the World Lines interface to
account for input uncertainties. The transport of steering
information to the underlying data-flow components is
handled by a novel meta-flow. The meta-flow is an extension
to a standard data-flow network, comprising additional nodes
and ropes to abstract parameter control. The meta-flow has a
visual representation to inform the user about which control
operations happen. Finally, we present the idea to use the
data-flow diagram itself for visualizing steering
information and simulation results. We discuss a case-study
in collaboration with a domain expert who proposes different
actions to protect a virtual city from imminent flooding.
The key to choosing the best response strategy is the
ability to compare different regions of the parameter space
while retaining an understanding of what is happening inside
the data-flow system.",
month = dec,
issn = "1077-2626",
journal = "IEEE Transactions on Visualization and Computer Graphics",
number = "12",
volume = "17",
pages = "1872--1881",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_NR/",
}
@article{muigg-2011-gpg,
title = "Interactive Volume Visualization of General Polyhedral Grids",
author = "Philipp Muigg and Markus Hadwiger and Helmut Doleisch and
Eduard Gr\"{o}ller",
year = "2011",
abstract = "This paper presents a novel framework for visualizing
volumetric data specified on complex polyhedral grids,
without the need to perform any kind of a priori
tetrahedralization. These grids are composed of polyhedra
that often are non-convex and have an arbitrary number of
faces, where the faces can be non-planar with an arbitrary
number of vertices. The importance of such grids in
state-of-the-art simulation packages is increasing rapidly.
We propose a very compact, face-based data structure for
representing such meshes for visualization, called two-sided
face sequence lists (TSFSL), as well as an algorithm for
direct GPU-based ray-casting using this representation. The
TSFSL data structure is able to represent the entire mesh
topology in a 1D TSFSL data array of face records, which
facilitates the use of efficient 1D texture accesses for
visualization. In order to scale to large data sizes, we
employ a mesh decomposition into bricks that can be handled
independently, where each brick is then composed of its own
TSFSL array. This bricking enables memory savings and
performance improvements for large meshes. We illustrate the
feasibility of our approach with real-world application
results, by visualizing highly complex polyhedral data from
commercial state-of-the-art simulation packages.",
month = dec,
journal = "IEEE Transaction on Visualization and Computer Graphics",
volume = "17",
number = "12",
issn = "1077 - 2626",
pages = "2115--2124",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/muigg-2011-gpg/",
}
@article{Groeller_2011_IVP,
title = "Interactive Virtual Probing of 4D MRI Blood-Flow",
author = "Roy van Pelt and Javier Oliv\'{a}n Besc\'{o}s and Marcel
Breeuwer and R.E. Clough and Eduard Gr\"{o}ller and Bart ter
Haar Romeny and Anna Vilanova i Bartroli",
year = "2011",
abstract = "Better understanding of hemodynamics conceivably leads to
improved diagnosis and prognosis of cardiovascular diseases.
Therefore, an elaborate analysis of the blood-flow in heart
and thoracic arteries is essential. Contemporary MRI
techniques enable acquisition of quantitative time-resolved
flow information, resulting in 4D velocity fields that
capture the blood-flow behavior. Visual exploration of these
fields provides comprehensive insight into the unsteady
blood-flow behavior, and precedes a quantitative analysis of
additional blood-flow parameters. The complete inspection
requires accurate segmentation of anatomical structures,
encompassing a time-consuming and hard-to-automate process,
especially for malformed morphologies. We present a way to
avoid the laborious segmentation process in case of
qualitative inspection, by introducing an interactive
virtual probe. This probe is positioned semi-automatically
within the blood-flow field, and serves as a navigational
object for visual exploration. The difficult task of
determining position and orientation along the
view-direction is automated by a fitting approach, aligning
the probe with the orientations of the velocity field. The
aligned probe provides an interactive seeding basis for
various flow visualization approaches. We demonstrate
illustration-inspired particles, integral lines and integral
surfaces, conveying distinct characteristics of the unsteady
blood-flow. Lastly, we present the results of an evaluation
with domain experts, valuing the practical use of our probe
and flow visualization techniques.",
month = dec,
issn = "1077 - 2626",
journal = "IEEE Transactions on Visualization and Computer Graphics",
number = "12",
volume = "17",
pages = "2153--2162",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_IVP/",
}
@article{haidacher-2011-VAM,
title = "Volume Analysis Using Multimodal Surface Similarity",
author = "Martin Haidacher and Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2011",
abstract = "The combination of volume data acquired by multiple
modalities has been recognized as an important but
challenging task. Modalities often differ in the structures
they can delineate and their joint information can be used
to extend the classification space. However, they frequently
exhibit differing types of artifacts which makes the process
of exploiting the additional information non-trivial. In
this paper, we present a framework based on an
information-theoretic measure of isosurface similarity
between different modalities to overcome these problems. The
resulting similarity space provides a concise overview of
the differences between the two modalities, and also serves
as the basis for an improved selection of features.
Multimodal classification is expressed in terms of
similarities and dissimilarities between the isosurfaces of
individual modalities, instead of data value combinations.
We demonstrate that our approach can be used to robustly
extract features in applications such as dual energy
computed tomography of parts in industrial manufacturing.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "17",
number = "12",
pages = "1969--1978",
keywords = "surface similarity, volume visualization, multimodal data",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/haidacher-2011-VAM/",
}
@inproceedings{Groeller_2011_GBC,
title = "Gradient-based Classification and Representation of Features
from Volume Data",
author = "Marius Gavrilescu and Vasile Manta and Eduard Gr\"{o}ller",
year = "2011",
abstract = "The extraction and representation of information from volume
data are important research avenues in computer-based
visualization. The interpretation of three- or
multi-dimensional data from various scanning devices is
important to medical imaging, diagnosis and treatment,
reliability and sustainability analyses in various
industrial branches, and, in more general terms, information
visualization. In this paper, we present several approaches
for the classification and representation of relevant
information from volume data sets. The techniques are based
on the gradient vector, a property directly derived from the
original volume data. We show how this property can be
computed and subsequently used for classification through
gradient-based one- and multi-dimensional transfer
functions, as well as for the enhancement of surface
features. The described techniques are illustrated through
images generated using our volume rendering framework, from
Computed Tomography (CT) and Magnetic Resonance Imaging
(MRI) data sets. The resulting images show how
gradient-based techniques are suited for improved volume
classification and the better extraction of meaningful
information.",
month = oct,
location = "Sinaia, Romania",
issn = "2068-0465",
editor = "Editura Universitaria Craiova (EUC)",
booktitle = "Proceedings of 15th International Conference on System
Theory, Control and computing (ICSTCC 2011)",
pages = "243--248",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_GBC/",
}
@inproceedings{Groeller_2011_NSM,
title = "Needle-Stability Maps for Brain-Tumor Biopsies",
author = "Paul Herghelegiu and Vasile Manta and Eduard Gr\"{o}ller",
year = "2011",
abstract = "Minimally invasive surgical procedures like biopsies require
the insertion of a needle to reach a specific tissue from
where samples are taken. This process is affected by a
number of errors that can lead to a different needle pathway
than originally planned. In the case of brain-tumor
biopsies, these errors can be caused by the brain shifting
when the skull is drilled, measurement errors due to the
physical framework that supports the biopsy needle or some
other human errors. To provide support for preoperative
planning, we introduce the concept of a biopsy-needle
stability-map. This map provides information on how stable a
biopsy-needle pathway is. We also introduce an algorithm for
finding the reachable points on the tumor border from one
specific entry point. A technique for automatically
selecting the needle pathway that offers the biggest minimal
distance to any blood vessel is also presented. A 3D
representation of the regions of interest (tumor, blood
vessels) together with the needle pathway and the reachable
points of the tumor has also been implemented. The resulting
stability map visually represents, using color-coding, how
close to any blood vessel the pathways surrounding the main
one are.",
month = oct,
location = "Sinaia, Romania",
issn = "2068-0465",
editor = "Editura Universitaria Craiova (EUC)",
booktitle = "Proceedings of 15th International Conference on System
Theory, Control and computing (ICSTCC 2011)",
pages = "259--263",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_NSM/",
}
@article{Groeller_2011_HP,
title = "High-performanceGPU-basedRendering for Real-Time,
rigid2D/3D-ImageRegistration and MotionPrediction in
RadiationOncology",
author = "Jakob Sp\"{o}rk and Christelle Gendrin and Christoph Weber
and Michael Figl and Supriyanto Ardjo Pawiro and Hugo
Furtado and Christoph Bloch and Helmar Bergmann and Eduard
Gr\"{o}ller and Wolfgang Birkfellner",
year = "2011",
abstract = "A common problem in image-guided radiation therapy (IGRT) of
lung cancer as well as other malignant diseases is the
compensation of periodic and aperiodic motion during dose
delivery. Modern systems for image-guided radiationoncology
allow for the acquisition of cone-beam computed tomography
data in the treatment room as well as the acquisition of
planar radiographs during the treatment. A mid-term research
goal is the compensation of tumor target volume motion by
2D/3Dregistration. In 2D/3Dregistration, spatial information
on organ location is derived by an iterative comparison of
perspective volume renderings, so-called digitally rendered
radiographs (DRR) from computed tomography volume data, and
planar reference x-rays. Currently, this rendering process
is very time consuming, and real-timeregistration, which
should at least provide data on organ position in less than
a second, has not come into existence. We present two
GPU-basedrendering algorithms which generate a DRR of 512 ×
512 pixels size from a CT dataset of 53 MB size at a pace of
almost 100 Hz. This rendering rate is feasible by applying a
number of algorithmic simplifications which range from
alternative volume-driven rendering approaches – namely
so-called wobbled splatting – to sub-sampling of the
DRR-image by means of specialized raycasting techniques.
Furthermore, general purpose graphics processing unit
(GPGPU) programming paradigms were consequently utilized.
Rendering quality and performance as well as the influence
on the quality and performance of the overall registration
process were measured and analyzed in detail. The results
show that both methods are competitive and pave the way for
fast motion compensation by rigid and possibly even
non-rigid2D/3Dregistration and, beyond that, adaptive
filtering of motion models in IGRT.",
month = jul,
journal = "Zeitschrift f\"{u}r Medizinische Physik",
note = "availabe online",
publisher = "Elsevier B.V.",
keywords = "real-time, sparse sampling, DRR, 2D/3D-registration",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_HP/",
}
@WorkshopTalk{sikachev_peter-2011-dfc,
title = "Dynamic Focus + Context for Volume Rendering",
author = "Peter Sikachev and Peter Rautek and Stefan Bruckner and
Eduard Gr\"{o}ller",
year = "2011",
abstract = "Interactive visualization is widely used in many
applications for efficient representation of complex data.
Many techniques make use of the focus+context approach in a
static manner. These techniques do not fully make use of the
interaction semantics. In this paper we present a dynamic
focus+context approach that highlights salient features
during user interaction. We explore rotation, panning, and
zooming interaction semantics and propose several methods of
changing visual representations, based on a suggested
engagement-estimation method. We use DVR-MIP interpolation
and a radial opacity-change approach, exploring rotation,
panning, and zooming semantics. Our approach adds short
animations during user interaction that help to explore the
data efficiently and aid the user in the detection of
unknown features.",
month = jun,
event = "Austrian-Russian Joint Seminar",
location = "VRVis, Vienna, Austria",
keywords = "focus + context, visualization, volume rendering, user
interaction",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/sikachev_peter-2011-dfc/",
}
@article{Muigg_2011_VC,
title = "Visual Coherence for Large-Scale Line-Plot Visualizations",
author = "Philipp Muigg and Markus Hadwiger and Helmut Doleisch and
Eduard Gr\"{o}ller",
year = "2011",
abstract = "Displaying a large number of lines within a limited amount
of screen space is a task that is common to many different
classes of visualization techniques such as time-series
visualizations, parallel coordinates, link-node diagrams,
and phase-space diagrams. This paper addresses the
challenging problems of cluttering and overdraw inherent to
such visualizations. We generate a 2x2 tensor field during
line rasterization that encodes the distribution of line
orientations through each image pixel. Anisotropic diffusion
of a noise texture is then used to generate a dense,
coherent visualization of line orientation. In order to
represent features of different scales, we employ a
multi-resolution representation of the tensor field. The
resulting technique can easily be applied to a wide variety
of line-based visualizations. We demonstrate this for
parallel coordinates, a time-series visualization, and a
phase-space diagram. Furthermore, we demonstrate how to
integrate a focus+context approach by incorporating a second
tensor field. Our approach achieves interactive rendering
performance for large data sets containing millions of data
items, due to its image-based nature and ease of
implementation on GPUs. Simulation results from
computational fluid dynamics are used to evaluate the
performance and usefulness of the proposed method.",
month = jun,
journal = "Computer Graphics Forum",
volume = "30",
number = "3",
issn = "0167-7055",
booktitle = "Computer Graphics Forum",
organization = "The Eurographics Association and Blackwell Publishing Ltd.",
publisher = "Blackwell Publishing",
pages = "643--652",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Muigg_2011_VC/",
}
@article{Berger_2011_UAE,
title = "Uncertainty-Aware Exploration of Continuous Parameter Spaces
Using Multivariate Prediction",
author = "Wolfgang Berger and Harald Piringer and Peter Filzmoser and
Eduard Gr\"{o}ller",
year = "2011",
abstract = "Systems projecting a continuous n-dimensional parameter
space to a continuous m-dimensional target space play an
important role in science and engineering. If evaluating the
system is expensive, however, an analysis is often limited
to a small number of sample points. The main contribution of
this paper is an interactive approach to enable a continuous
analysis of a sampled parameter space with respect to
multiple target values. We employ methods from statistical
learning to predict results in real-time at any user-defined
point and its neighborhood. In particular, we describe
techniques to guide the user to potentially interesting
parameter regions, and we visualize the inherent uncertainty
of predictions in 2D scatterplots and parallel coordinates.
An evaluation describes a realworld scenario in the
application context of car engine design and reports
feedback of domain experts. The results indicate that our
approach is suitable to accelerate a local sensitivity
analysis of multiple target dimensions, and to determine a
sufficient local sampling density for interesting parameter
regions.",
month = jun,
journal = "Computer Graphics Forum",
volume = "30",
number = "3",
note = "Best Paper Award",
issn = "0167-7055",
pages = "911--920",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Berger_2011_UAE/",
}
@WorkshopTalk{Groeller_2011_CW,
title = "Contingency Wheel: Visual Analysis of Large Contingency
Tables",
author = "Bilal Alsallakh and Eduard Gr\"{o}ller and Silvia Miksch and
Martin Suntinger",
year = "2011",
abstract = "We present the Contingency Wheel, a visual method for
finding and analyzing associations in a large nm contingency
table with m < 100 and n being two to three orders of
magnitude larger than m. The method is demonstrated on a
large table from the Book-Crossing dataset, which counts the
number of ratings each book received from each country. It
enables finding books that received a disproportionately
high number of ratings from a specific country. It further
allows to visually analyze what these books have in common,
and with which countries they are also highly associated.
Pairs of similar countries can further be identified (in the
sense that many books are associated with both countries).
Compared with existing visual methods, our approach enables
analyzing and gaining insight into larger tables.",
month = may,
event = "International Workshop on Visual Analytics (2011)",
location = "Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_CW/",
}
@misc{Groeller_2011_IPV,
title = "Illustrative Particle Visualization of 4D MRI Blood-Flow
Data",
author = "Roy van Pelt and Eduard Gr\"{o}ller and Bart ter Haar
Romenij and Anna Vilanova i Bartroli",
year = "2011",
month = may,
location = "Bergen, Norway",
event = "EuroVis 2011",
booktitle = "Biomedical Image Analysis",
Conference date = "Poster presented at EuroVis 2011 (2011-05-31--2011-06-03)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_IPV/",
}
@inproceedings{Carata_2011_IVE,
title = "Improving the Visualization of Electron-Microscopy Data
Through Optical Flow Interpolation",
author = "Lucian Carata and Dan Shao and Markus Hadwiger and Eduard
Gr\"{o}ller",
year = "2011",
abstract = "Technical developments in neurobiology have reached a point
where the acquisition of high resolution images representing
individual neurons and synapses becomes possible. For this,
the brain tissue samples are sliced using a diamond knife
and imaged with electron-microscopy (EM). However, the
technique achieves a low resolution in the cutting
direction, due to limitations of the mechanical process,
making a direct visualization of a dataset difficult. We aim
to increase the depth resolution of the volume by adding new
image slices interpolated from the existing ones, without
requiring modifications to the EM image-capturing method. As
classical interpolation methods do not provide satisfactory
results on this type of data, the current paper proposes a
re-framing of the problem in terms of motion volumes,
considering the depth axis as a temporal axis. An optical
flow method is adapted to estimate the motion vectors of
pixels in the EM images, and this information is used to
compute and insert multiple new images at certain depths in
the volume. We evaluate the visualization results in
comparison with interpolation methods currently used on EM
data, transforming the highly anisotropic original dataset
into a dataset with a larger depth resolution. The
interpolation based on optical flow better reveals neurite
structures with realistic undistorted shapes, and helps to
easier map neuronal connections.",
month = apr,
organization = "Spring Conference on Computer Graphics",
location = "Vini\v{c}n\'{e}, Slovak Republic",
booktitle = "Proceedings of the 27th Spring Conference on Computer
Graphics",
pages = "1--8",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Carata_2011_IVE/",
}
@inproceedings{patel-2011-PEA,
title = "PhD Education Through Apprenticeship",
author = "Daniel Patel and Eduard Gr\"{o}ller and Stefan Bruckner",
year = "2011",
abstract = "We describe and analyze the PhD education in the
visualization group at the Vienna University of Technology
and set the education in a larger perspective. Four central
mechanisms drive the PhD education in Vienna. They are: to
require an article-based PhD; to give the student freedom to
choose research direction; to let students work in shared
offices towards joint deadlines; and to involve students in
reviewing articles. This paper describes these mechanisms in
detail and illustrates their effect.",
month = apr,
location = "Llandudno, United Kingdom",
editor = "S. Maddock, J. Jorge",
booktitle = "Proceedings of Eurographics 2011 - Education Papers",
pages = "23--28",
keywords = "meister, education, visualization, apprenticeship",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/patel-2011-PEA/",
}
@inproceedings{vucini-2011,
title = "Enhancing Visualization with Real-Time Frequency-based
Transfer Functions",
author = "Erald Vucini and Daniel Patel and Eduard Gr\"{o}ller",
year = "2011",
abstract = "Transfer functions have a crucial role in the understanding
and visualization of 3D data. While research has scrutinized
the possible uses of one and multi-dimensional transfer
functions in the spatial domain, to our knowledge, no
attempt has been done to explore transfer functions in the
frequency domain. In this work we propose transfer functions
for the purpose of frequency analysis and visualization of
3D data. Frequency-based transfer functions offer the
possibility to discriminate signals, composed from different
frequencies, to analyze problems related to signal
processing, and to help understanding the link between the
modulation of specific frequencies and their impact on the
spatial domain. We demonstrate the strength of
frequency-based transfer functions by applying them to
medical CT, ultrasound and MRI data, physics data as well as
synthetic seismic data. The interactive design of complex
filters for feature enhancement can be a useful addition to
conventional classification techniques.",
month = jan,
isbn = "978-0-8194-8405-5",
series = "7868",
organization = "IS&T/SPIE",
location = "San Francisco, USA",
booktitle = "Proceedings of IS&T/SPIE Conference on Visualization and
Data Analysis",
pages = "78680L-1--78680L-12",
keywords = "Real Time, Data Enhancement, Frequency Analysis, Transfer
Function, Volume Rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/vucini-2011/",
}
@talk{Groeller-2011-HSH,
title = "The Haunted Swamps of Heuristics",
author = "Eduard Gr\"{o}ller",
year = "2011",
event = "EuroVis 2011",
location = "Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller-2011-HSH/",
}
@talk{Groeller_2011_VCD,
title = "Visualization of Complex Data: Going from Linked to
Integrated Views ",
author = "Eduard Gr\"{o}ller",
year = "2011",
abstract = "Data Visualization uses computer-supported, interactive,
visual representations of (abstract) data to amplify
cognition. In recent years data complexity has increased
tremendously. This is for example due to an increase in data
size and dimensionality. New imaging modalities generate
quite heterogeneous, multi-valued, multi-modal, and
time-varying data. Separate views and linked views are
approaches to cope with complexity, but are limited, e.g.,
concerning scalability. This talk will concentrate
especially on integrated views as inspired by traditional
illustrations. Integration can be coarse or sparse in space
and time. It may even involve different spaces with varying
dimensionality and characteristics. The talk will discuss
several research examples which go beyond data and image
fusion. More details will be given about a specific display
of 3D volume data integrated into a 2D graph view.",
event = "Visualisierungsinstitut der Universit\"{a}t Stuttgart
(VISUS)",
location = "University of Stuttgart, Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_VCD/",
}
@talk{Groeller_2011_VSS,
title = "Visual Steering to Support Decision Making in Visdom",
author = "Eduard Gr\"{o}ller",
year = "2011",
abstract = "Computer simulation has become an ubiquitous tool to
investigate the nature of systems. When steering a
simulation, users modify parameters to study their impact on
the simulation outcome. The ability to test alternative
options provides the basis for interactive decision making.
Increasingly complex simulations are characterized by an
intricate interplay of many heterogeneous input and output
parameters. A steering concept that combines simulation and
visualization within a single, comprehensive system is
largely missing. This talk targets the basic components of a
novel integrated steering system called Visdom to support
the user in the decision making process. The proposed
techniques enable users to examine alternative scenarios
without the need for special simulation expertise. To
accomplish this, we propose World Lines as a management
strategy for multiple, related simulation runs. In a
dedicated view, users create and navigate through many
simulation runs. New decisions are included through the
concept of branching. To account for uncertain knowledge
about the input parameters, we provide the ability to cover
full parameter distributions. Via multiple cursors, users
navigate a system of multiple linked views through time and
alternative scenarios. In this way, the system supports
comparative visual analysis of many simulation runs. Since
the steering process generates a huge amount of information,
we employ the machine to support the user in the search for
explanations inside the computed data. Visdom is built on
top of a data-flow network to provide a high level of
modularity. A decoupled meta-flow is in charge of
transmitting parameter changes from World Lines to the
affected dataflow nodes. To direct the user attention to the
most relevant parts, we provide dynamic visualization inside
the flow diagram. The usefulness of the presented approach
is substantiated through case studies in the field of flood
management. The Visdom application enables the design of a
breach closure by dropping sandbags in a virtual
environment.",
event = "Visual Computing Forum",
location = "Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_VSS/",
}
@talk{Groeller_2011_HSU,
title = "The Haunted Swamps of Uniformity",
author = "Eduard Gr\"{o}ller",
year = "2011",
abstract = "Dissemination of scientific results in visualization (like
in many other disciplines) through papers and talks follow
rather standardized styles and procedures. Given that
publishing strategies were very different not so much time
ago in the past, and given new technological developments
like electronic publishing, ideas of possible future
developments are discussed. Topics treated include:
increased repeatability through augmenting papers with
executables, providing more extensive sensitivity and
robustness analyses, paper presentation as drama, poem,
comics strip.",
event = "Seminar 11231, Scientific Visualization, Dagstuhl",
location = "Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_HSU/",
}
@talk{Groeller_2011_VSD,
title = "Visual Steering to Support Decision Making in Visdom",
author = "Eduard Gr\"{o}ller",
year = "2011",
event = "Visual Computing Forum, University of Bergen",
location = "Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_VSD/",
}
@talk{Groeller_2011_CVC,
title = "Comprehensive Visualizationof Cardiac MRI Data",
author = "Eduard Gr\"{o}ller",
year = "2011",
abstract = "Coronary artery disease is one of the leading causes of
death in the western world. The continuous improvements in
magnetic resonance imaging (MRI) technology facilitate more
accurate diagnoses by providing increasingly more detailed
information on the viability, functioning, perfusion, and
anatomy of a patient’s heart. The talk covers several
techniques that realize multi-modal visualizations of a
patient’s heart to assist in the diagnosis of coronary
artery disease . A volumetric bull’s eye offers a more
comprehensive view on the viability of a patient’s heart
by providing detailed information on the transmurality of
scar while not suffering from discontinuities. Anatomical
context is often lost due to abstract representations of
data, or may be scarce due to the nature of the scanning
protocol. Several techniques to restore the relation to
anatomy are presented. The primary coronary arteries are
segmented in a whole heart scan and mapped onto a volumetric
bull’s eye plot, adding anatomical context to an abstract
representation. Similarly, segmented late enhancement data
are rendered along with a three-dimensional segmentation of
the patient-specific myocardial and coronary anatomy.
Additionally, coronary supply territories are computed from
patient-specific data as an improvement over models based on
population averages. Information on the perfusion of the
myocardium provided by MRI is typically of fairly low
resolution. Using high-resolution anatomical data, an
approach to visualize simulated myocardial perfusion is
presented, taking full advantage of the detailed information
on perfusion. Finally, a truly comprehensive visualization
of a cardiac MRI exam is explored by combining whole heart,
late enhancement, functional, and perfusion scans in a
single visualization.",
event = "Workshop Geometry for Anatomy, Banff International Research
Station for Mathematical Innovation and Discovery (BIRS)",
location = "Banff, Canada",
URL = "https://www.cg.tuwien.ac.at/research/publications/2011/Groeller_2011_CVC/",
}
@article{Waser-2010-WL,
title = "World Lines",
author = "J\"{u}rgen Waser and Raphael Fuchs and Hrvoje
Ribi\v{c}i\'{c} and Benjamin Schindler and G\"{u}nter
Bl\"{o}schl and Eduard Gr\"{o}ller",
year = "2010",
abstract = "In this paper we present World Lines as a novel interactive
visualization that provides complete control over multiple
heterogeneous simulation runs. In many application areas,
decisions can only be made by exploring alternative
scenarios. The goal of the suggested approach is to support
users in this decision making process. In this setting, the
data domain is extended to a set of alternative worlds where
only one outcome will actually happen. World Lines
integrates simulation, visualization and computational
steering into a single unified system that is capable of
dealing with the extended solution space. World Lines
represents simulation runs as causally connected tracks that
share a common time axis. This setup enables users to
interfere and add new information quickly. A World Line is
introduced as a visual combination of user events and their
effects in order to present a possible future. To quickly
find the most attractive outcome, we suggest World Lines as
the governing component in a system of multiple linked views
and a simulation component. World Lines employs linking and
brushing to enable comparative visual analysis of multiple
simulations in linked views. Analysis results can be mapped
to various visual variables that World Lines provides in
order to highlight the most compelling solutions. To
demonstrate this technique we present a flooding scenario
and show the usefulness of the integrated approach to
support informed decision making.",
month = nov,
journal = "IEEE Transactions on visualization and Computer Graphics",
number = "6",
volume = "16",
booktitle = "IEEE Transactions on Visualization and Computer Graphics",
pages = "1458--1467",
keywords = "decision making, simulation steering, parallel worlds, CFD,
smoothed particle hydrodynamics., Problem solving
environment",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Waser-2010-WL/",
}
@inproceedings{sikachev-2010-DFC,
title = "Dynamic Focus+Context for Volume Rendering",
author = "Peter Sikachev and Peter Rautek and Stefan Bruckner and
Eduard Gr\"{o}ller",
year = "2010",
abstract = "Interactive visualization is widely used in many
applications for efficient representation of complex data.
Many techniques make use of the focus+context approach in a
static manner. These techniques do not fully make use of the
interaction semantics. In this paper we present a dynamic
focus+context approach that highlights salient features
during user interaction. We explore rotation, panning, and
zooming interaction semantics and propose several methods of
changing visual representations, based on a suggested
engagement-estimation method. We use DVR-MIP interpolation
and a radial opacity-change approach, exploring rotation,
panning, and zooming semantics. Our approach adds short
animations during user interaction that help to explore the
data efficiently and aid the user in the detection of
unknown features.",
month = nov,
location = "Siegen, Germany",
address = "University of Siegen, Siegen, Germany",
booktitle = "Proceedings of Vision, Modeling and Visualization 2010",
pages = "331--338",
keywords = "focus+contex, volume rendering, view-dependent
visualization, level-of-detail techniques, nonphotorealistic
techniques, user interaction",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/sikachev-2010-DFC/",
}
@inproceedings{Gavrilescu-2010-CIE,
title = "Custom Interface Elements for Improved Paramter Control in
Volume Rendering",
author = "Marius Gavrilescu and Muhammad Muddassir Malik and Eduard
Gr\"{o}ller",
year = "2010",
abstract = "In volume visualization interfaces, renderingrelated
parameters are often manually editable through various
controls and interface elements. Most of the time however,
these offer little or no beforehand information on the
resulting effects that would occur for certain parameter
values or across the whole value domain. This makes
parameter adjustment a trial and error process. We have
developed techniques to anticipate these changes and display
them on customized versions of popular interface elements,
such as sliders or transfer function editors. Through the
use of visualization means such as graphs, color mapping,
and various other indicators, the influence of potential
parameter changes on the volume rendering output can be
assessed before any actual changes are made. This makes it
easier for the potential user to work with such interfaces,
while receiving feedback on parameter behavior and
stability.",
month = oct,
location = "Sinaia, Romania",
booktitle = "14th Int. Conf. on System Theory and Control 2010",
pages = "219--224",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Gavrilescu-2010-CIE/",
}
@article{amirkhanov2010AMA,
title = "Visual Optimality and Stability Analysis of 3DCT Scan
Positions",
author = "Artem Amirkhanov and Christoph Heinzl and Michael Reiter and
Eduard Gr\"{o}ller",
year = "2010",
abstract = "Industrial cone-beam X-Ray computed tomography (CT) systems
often face problems due to artifacts caused by a bad
placement of the specimen on the rotary plate. This paper
presents a visual-analysis tool for CT systems, which
provides a simulation-based preview and estimates artifacts
and deviations of a specimen’s placement using the
corresponding 3D geometrical surface model as input. The
presented tool identifies potentially good or bad placements
of a specimen and regions of a specimen, which cause the
major portion of artefacts. The tool can be used for a
preliminary analysis of the specimen before CT scanning, in
order to determine the optimal way of placing the object.
The analysis includes: penetration lengths, placement
stability and an investigation in Radon space. Novel
visualization techniques are applied to the simulation data.
A stability widget is presented for determining the
placement parameters’ robustness. The performance and the
comparison of results provided by the tool compared with
real world data is demonstrated using two specimens.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics",
pages = "Page 1477 --1487",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/amirkhanov2010AMA/",
}
@article{malik-2010-cvp,
title = "Comparative Visualization for Parameter Studies of Dataset
Series",
author = "Muhammad Muddassir Malik and Christoph Heinzl and Eduard
Gr\"{o}ller",
year = "2010",
abstract = "This paper proposes comparison and visualization techniques
to carry out parameter studies for the special application
area of dimensional measurement using 3D X-ray computed
tomography (3DCT). A dataset series is generated by scanning
a specimen multiple times by varying parameters of an
industrial 3DCT device. A high-resolution series is explored
using our planar-reformatting-based visualization system. We
present a novel multi-image view and an edge explorer for
comparing and visualizing gray values and edges of several
datasets simultaneously. Visualization results and
quantitative data are displayed side by side. Our technique
is scalable and generic. It can be effective in various
application areas like parameter studies of imaging
modalities and dataset artifact detection. For fast data
retrieval and convenient usability, we use bricking of the
datasets and efficient data structures. We evaluate the
applicability of the proposed techniques in collaboration
with our company partners.",
month = sep,
issn = "1077-2626 ",
journal = "IEEE Transaction on Visualization and Computer Graphics
(TVCG)",
number = "5",
volume = "16",
pages = " 829--840 ",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/malik-2010-cvp/",
}
@inproceedings{Balabanian-2010-IIV,
title = "Interactive Illustrative Visualization of Hierarchical
Volume Data",
author = "Jean-Paul Balabanian and Ivan Viola and Eduard Gr\"{o}ller",
year = "2010",
abstract = "In scientific visualization the underlying data often has an
inherent abstract and hierarchical structure. Therefore, the
same dataset can simultaneously be studied with respect to
its characteristics in the three-dimensional space and in
the hierarchy space. Often both characteristics are equally
important to convey. For such scenarios we explore the
combination of hierarchy visualization and scientific
visualization, where both data spaces are effectively
integrated. We have been inspired by illustrations of
species evolutions where hierarchical information is often
present. Motivated by these traditional illustrations, we
introduce integrated visualizations for hierarchically
organized volumetric datasets. The hierarchy data is
displayed as a graph, whose nodes are visually augmented to
depict the corresponding 3D information. These augmentations
include images due to volume raycasting, slicing of 3D
structures, and indicators of structure visibility from
occlusion testing. New interaction metaphors are presented
that extend visualizations and interactions, typical for one
visualization space, to control visualization parameters of
the other space. Interaction on a node in the hierarchy
influences visual representations of 3D structures and vice
versa. We integrate both the abstract and the scientific
visualizations into one view which avoids frequent
refocusing typical for interaction with linked-view layouts.
We demonstrate our approach on different volumetric datasets
enhanced with hierarchical information.",
month = jun,
location = "Ottawa, Ontario, Canada",
booktitle = "Proceedings of Graphics Interface 2010",
pages = "137--144",
keywords = "visualization, volume data, hierarchical",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Balabanian-2010-IIV/",
}
@inproceedings{patel-2010-SVV,
title = "Seismic Volume Visualization for Horizon Extraction",
author = "Daniel Patel and Stefan Bruckner and Ivan Viola and Eduard
Gr\"{o}ller",
year = "2010",
abstract = "Seismic horizons indicate change in rock properties and are
central in geoscience interpretation. Traditional
interpretation systems involve time consuming and repetitive
manual volumetric seeding for horizon growing. We present a
novel system for rapidly interpreting and visualizing
seismic volumetric data. First we extract horizon
surface-parts by preprocessing the seismic data. Then during
interaction the user can assemble in realtime the horizon
parts into horizons. Traditional interpretation systems use
gradient-based illumination models in the rendering of the
seismic volume and polygon rendering of horizon surfaces. We
employ realtime gradientfree forward-scattering in the
rendering of seismic volumes yielding results similar to
high-quality global illumination. We use an implicit surface
representation of horizons allowing for a seamless
integration of horizon rendering and volume rendering. We
present a collection of novel techniques constituting an
interpretation and visualization system highly tailored to
seismic data interpretation.",
month = mar,
location = "Taipei, Taiwan",
booktitle = "Proceedings of IEEE Pacific Visualization 2010",
pages = "73--80",
keywords = "volume visualization, horizon extraction, seismic data",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/patel-2010-SVV/",
}
@inproceedings{haidacher_2010_statTF,
title = "Volume Visualization based on Statistical Transfer-Function
Spaces",
author = "Martin Haidacher and Daniel Patel and Stefan Bruckner and
Armin Kanitsar and Eduard Gr\"{o}ller",
year = "2010",
abstract = "It is a difficult task to design transfer functions for
noisy data. In traditional transfer-function spaces, data
values of different materials overlap. In this paper we
introduce a novel statistical transfer-function space which
in the presence of noise, separates different materials in
volume data sets. Our method adaptively estimates
statistical properties, i.e. the mean value and the standard
deviation, of the data values in the neighborhood of each
sample point. These properties are used to define a
transfer-function space which enables the distinction of
different materials. Additionally, we present a novel
approach for interacting with our new transfer-function
space which enables the design of transfer functions based
on statistical properties. Furthermore, we demonstrate that
statistical information can be applied to enhance visual
appearance in the rendering process. We compare the new
method with 1D, 2D, and LH transfer functions to demonstrate
its usefulness.",
month = mar,
booktitle = "Proceedings of the IEEE Pacific Visualization 2010",
pages = "17--24",
keywords = "transfer function, statistics, shading, noisy data,
classification",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/haidacher_2010_statTF/",
}
@talk{Grorller-2010-IVV,
title = "Integrated Views in Visualization",
author = "Eduard Gr\"{o}ller",
year = "2010",
abstract = "Data Visualization uses computer-supported, interactive,
visual representations of (abstract) data to amplify
cognition. In recent years data complexity has increased
tremendously. This is for example due to an increase in data
size and dimensionality. New imaging modalities generate
quite heterogeneous, multi-valued, multi-modal, and
time-varying data. Separate views and linked views are
approaches to cope with complexity, but are limited, e.g.,
concerning scalability. This talk will concentrate rather on
integrated views as inspired by traditional illustrations.
The concept of A-space is presented. It is the “space”
where visualization algorithms reside. Every visualization
algorithm is a unique point in A-space. Integrated
visualizations can be interpreted as an “interpolation”
between known algorithms. The void between algorithms can be
considered as a visualization opportunity where a new point
in A-space can be reconstructed and new integrated
visualizations can be created. The talk will discuss several
research examples which go beyond data and image fusion and
achieve what can be considered algorithm fusion. ",
month = feb,
event = "GMSV seminar",
location = "KAUST, Thuwal, Saudi Arabia",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Grorller-2010-IVV/",
}
@misc{groeller-2010-How,
title = "How To Do Research",
author = "Eduard Gr\"{o}ller",
year = "2010",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/groeller-2010-How/",
}
@talk{Groeller-2010-IVVI,
title = "Integrated Views in Visualization",
author = "Eduard Gr\"{o}ller",
year = "2010",
abstract = "Data Visualization uses computer-supported, interactive,
visual representations of (abstract) data to amplify
cognition. In recent years data complexity has increased
tremendously. This is for example due to an increase in data
size and dimensionality. New imaging modalities generate
quite heterogeneous, multi-valued, multi-modal, and
time-varying data. Separate views and linked views are
approaches to cope with complexity, but are limited, e.g.,
concerning scalability. This talk will concentrate rather on
integrated views as inspired by traditional illustrations.
The concept of A-space is presented. It is the “space”
where visualization algorithms reside. Every visualization
algorithm is a unique point in A-space. Integrated
visualizations can be interpreted as an “interpolation”
between known algorithms. The void between algorithms can be
considered as a visualization opportunity where a new point
in A-space can be reconstructed and new integrated
visualizations can be created. The talk will discuss several
research examples which go beyond data and image fusion and
achieve what can be considered algorithm fusion. ",
event = "Institute seminar, Department of Informatics",
location = "University of Bergen",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Groeller-2010-IVVI/",
}
@article{Balabanian-2010-PSDSV,
title = "Proceedings of Schloss Dagstuhl Scientific Visualization
Workshop, 2009 (published 2010)",
author = "Jean-Paul Balabanian and Eduard Gr\"{o}ller",
year = "2010",
abstract = "This paper describes the concept of A-space. A-space is the
space where visualization algorithms reside. Every
visualization algorithm is a unique point in A-space.
Integrated visualizations can be interpreted as an
interpolation between known algorithms. The void between
algorithms can be considered as a visualization opportunity
where a new point in A-space can be reconstructed and new
integrated visualizations can be created.",
issn = "1868-8977",
journal = "Schloss Dagstuhl Follow Ups",
number = "1",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Balabanian-2010-PSDSV/",
}
@incollection{bruckner-2010-IFC,
title = "Illustrative Focus+Context Approaches in Interactive Volume
Visualization",
author = "Stefan Bruckner and Eduard Gr\"{o}ller and Klaus Mueller and
Bernhard Preim and Deborah Silver",
year = "2010",
abstract = "Illustrative techniques are a new and exciting direction in
visualization research. Traditional techniques which have
been used by scientific illustrators for centuries are
re-examined under the light of modern computer technology.
In this paper, we discuss the use of the focus+context
concept for the illustrative visualization of volumetric
data. We give an overview of the state-of-the-art and
discuss recent approaches which employ this concept in novel
ways.",
booktitle = "Scientific Visualization: Advanced Concepts",
chapter = "10",
editor = "Hans Hagen",
isbn = "978-3-939897-19-4",
note = "The article was originally written in 2005 after the
Dagstuhl Seminar on Scientific Visualization and reflects
the state-of-the-art at that time.",
series = "Dagstuhl Follow-Ups",
keywords = "Illustrative Visualization, Volumetric Data",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/bruckner-2010-IFC/",
}
@talk{Groeller-2010-CVC,
title = "Comprehensive Visualization of Cardiac MRI Data",
author = "Eduard Gr\"{o}ller",
year = "2010",
abstract = "Coronary artery disease is one of the leading causes of
death in the western world. The continuous improvements in
magnetic resonance imaging (MRI) technology facilitate more
accurate diagnoses by providing increasingly more detailed
information on the viability, functioning, perfusion, and
anatomy of a patient’s heart. The talk covers several
novel techniques that realize multi-modal visualizations of
a patient’s heart to assist in the diagnosis of coronary
artery disease . A volumetric bull’s eye offers a more
comprehensive view on the viability of a patient’s heart
by providing detailed information on the transmurality of
scar while not suffering from discontinuities. Anatomical
context is often lost due to abstract representations of
data, or may be scarce due to the nature of the scanning
protocol. Several techniques to restore the relation to
anatomy are presented. The primary coronary arteries are
segmented in a whole heart scan and mapped onto a volumetric
bull’s eye plot, adding anatomical context to an abstract
representation. Similarly, segmented late enhancement data
are rendered along with a three-dimensional segmentation of
the patient-specific myocardial and coronary anatomy.
Additionally, coronary supply territories are computed from
patient-specific data as an improvement over models based on
population averages. Information on the perfusion of the
myocardium provided by MRI is typically of fairly low
resolution. Using high-resolution anatomical data, an
approach to visualize simulated myocardial perfusion is
presented, taking full advantage of the detailed information
on perfusion. Finally, a truly comprehensive visualization
of a cardiac MRI exam is explored by combining whole heart,
late enhancement, functional, and perfusion scans in a
single visualization. ",
event = "MedViz seminar",
location = "University of Bergen",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Groeller-2010-CVC/",
}
@talk{Groeller-2010-IFI,
title = "Illustrative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2010",
abstract = "Illustrations play a major role in the education process.
Whether used to teach a surgical or radiologic procedure, to
illustrate normal or aberrant anatomy, or to explain the
functioning of a technical device, illustration
significantly impacts learning. One of the key concepts for
creating an expressive illustration is abstraction.
Abstraction introduces a distortion between the
visualization and the underlying model according to the
communicative intent of the illustration. Inspired by
observations from hand-made illustrations, similar
techniques for the generation of rendered images have been
developed. These techniques work on different levels: low
level abstraction techniques (stylized depiction methods)
deal with how objects should be presented, while high level
abstraction techniques (smart visibility approaches) are
concerned with what should be visible and recognizable. We
review several existing approaches from both categories and
describe concepts used in the design of a system for
creating interactive illustrations directly from volumetric
data. A fully dynamic three-dimensional illustration
environment is discussed which directly operates on volume
data. Single images have the aesthetic appeal of traditional
illustrations, but can be interactively altered and
explored. Furthermore, we discuss several illustrative
concepts like style transfer functions, exploded views,
semantic layers, and illustration-inspired integrated views.
Further information on the presented techniques is available
at http://www.cg.tuwien.ac.at/research/vis/. ",
event = "IFI colloquium",
location = "Department of Informatics, University of Zurich",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/Groeller-2010-IFI/",
}
@misc{groeller-2010-PTT,
title = "Practical Tips and Tricks for Paper Writing (updated 2021)",
author = "Eduard Gr\"{o}ller",
year = "2010",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/groeller-2010-PTT/",
}
@article{bruckner-2010-HVC,
title = "Hybrid Visibility Compositing and Masking for Illustrative
Rendering",
author = "Stefan Bruckner and Peter Rautek and Ivan Viola and Mike
Roberts and Mario Costa Sousa and Eduard Gr\"{o}ller",
year = "2010",
abstract = "In this paper, we introduce a novel framework for the
compositing of interactively rendered 3D layers tailored to
the needs of scientific illustration. Currently, traditional
scientific illustrations are produced in a series of
composition stages, combining different pictorial elements
using 2D digital layering. Our approach extends the layer
metaphor into 3D without giving up the advantages of 2D
methods. The new compositing approach allows for effects
such as selective transparency, occlusion overrides, and
soft depth buffering. Furthermore, we show how common
manipulation techniques such as masking can be integrated
into this concept. These tools behave just like in 2D, but
their influence extends beyond a single viewpoint. Since the
presented approach makes no assumptions about the underlying
rendering algorithms, layers can be generated based on
polygonal geometry, volumetric data, pointbased
representations, or others. Our implementation exploits
current graphics hardware and permits real-time interaction
and rendering.",
journal = "Computers & Graphics",
number = "34",
pages = "361--369",
keywords = "compositing, masking, illustration",
URL = "https://www.cg.tuwien.ac.at/research/publications/2010/bruckner-2010-HVC/",
}
@article{bruckner-2009-BVQ,
title = "BrainGazer - Visual Queries for Neurobiology Research",
author = "Stefan Bruckner and Veronika Solteszova and Eduard
Gr\"{o}ller and Ji\v{r}\'{i} Hlad\r{u}vka and Katja
B\"{u}hler and Jai Yu and Barry Dickson",
year = "2009",
abstract = "Neurobiology investigates how anatomical and physiological
relationships in the nervous system mediate behavior.
Molecular genetic techniques, applied to species such as the
common fruit fly Drosophila melanogaster, have proven to be
an important tool in this research. Large databases of
transgenic specimens are being built and need to be analyzed
to establish models of neural information processing. In
this paper we present an approach for the exploration and
analysis of neural circuits based on such a database. We
have designed and implemented BrainGazer, a system which
integrates visualization techniques for volume data acquired
through confocal microscopy as well as annotated anatomical
structures with an intuitive approach for accessing the
available information. We focus on the ability to visually
query the data based on semantic as well as spatial
relationships. Additionally, we present visualization
techniques for the concurrent depiction of neurobiological
volume data and geometric objects which aim to reduce visual
clutter. The described system is the result of an ongoing
interdisciplinary collaboration between neurobiologists and
visualization researchers.",
month = nov,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "15",
number = "6",
pages = "1497--1504",
keywords = "biomedical visualization, neurobiology, visual queries,
volume visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/bruckner-2009-BVQ/",
}
@article{fritz-2009-ava,
title = "A Visual Approach to Efficient Analysis and Quantification
of Ductile Iron and Reinforced Sprayed Concrete",
author = "Laura Fritz and Markus Hadwiger and Georg Geier and Gerhard
Pittino and Eduard Gr\"{o}ller",
year = "2009",
month = oct,
journal = "IEEE TVCG",
volume = "15",
number = "6",
issn = "1077-2626",
pages = "1343--1350",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/fritz-2009-ava/",
}
@article{fuchs_vhml,
title = "Visual Human+Machine Learning",
author = "Raphael Fuchs and J\"{u}rgen Waser and Eduard Gr\"{o}ller",
year = "2009",
abstract = "In this paper we describe a novel method to integrate
interactive visual analysis and machine learning to support
the insight generation of the user. The suggested approach
combines the vast search and processing power of the
computer with the superior reasoning and pattern recognition
capabilities of the human user. An evolutionary search
algorithm has been adapted to assist in the fuzzy logic
formalization of hypotheses that aim at explaining features
inside multivariate, volumetric data. Up to now, users
solely rely on their knowledge and expertise when looking
for explanatory theories. However, it often remains unclear
whether the selected attribute ranges represent the real
explanation for the feature of interest. Other selections
hidden in the large number of data variables could
potentially lead to similar features. Moreover, as
simulation complexity grows, users are confronted with huge
multidimensional data sets making it almost impossible to
find meaningful hypotheses at all. We propose an interactive
cycle of knowledge-based analysis and automatic hypothesis
generation. Starting from initial hypotheses, created with
linking and brushing, the user steers a heuristic search
algorithm to look for alternative or related hypotheses. The
results are analyzed in information visualization views that
are linked to the volume rendering. Individual properties as
well as global aggregates are visually presented to provide
insight into the most relevant aspects of the generated
hypotheses. This novel approach becomes computationally
feasible due to a GPU implementation of the time-critical
parts in the algorithm. A thorough evaluation of search
times and noise sensitivity as well as a case study on data
from the automotive domain substantiate the usefulness of
the suggested approach.",
month = oct,
journal = "IEEE TVCG",
volume = "15",
number = "6",
issn = "1077-2626",
pages = "1327--1334",
keywords = "Volumetric Data, Interactive Visual Analysis, Knowledge
Discovery, Genetic Algorithm, Curse of Dimensionality,
Predictive Analysis, Computer-assisted Multivariate Data
Expl, Multiple Competing Hypotheses",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/fuchs_vhml/",
}
@article{vucini_2009,
title = "On Visualization and Reconstruction from Non-Uniform Point
Sets using B-splines",
author = "Erald Vucini and Torsten M\"{o}ller and Eduard Gr\"{o}ller",
year = "2009",
abstract = "In this paper we present a novel framework for the
visualization and reconstruction from non-uniform point
sets. We adopt a variational method for the reconstruction
of 3D non-uniform data to a uniform grid of chosen
resolution. We will extend this reconstruction to an
efficient multi-resolution uniform representation of the
underlying data. Our multi-resolution representation
includes a traditional bottom-up multi-resolution approach
and a novel top-down hierarchy for adaptive hierarchical
reconstruction. Using a hybrid regularization functional we
can improve the reconstruction results. Finally, we discuss
further application scenarios and show rendering results to
emphasize the effectiveness and quality of our proposed
framework. By means of qualitative results and error
comparisons we demonstrate superiority of our method
compared to competing methods",
month = jun,
journal = "Computer Graphics Forum",
volume = "28",
number = "3",
note = "2nd Best Paper Award",
issn = "0167-7055",
pages = "1007--1014",
keywords = "B-splines, Image Processing and Computer Vision, Non-uniform
data, Reconstruction",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/vucini_2009/",
}
@article{bruckner-2009-IVV,
title = "Instant Volume Visualization using Maximum Intensity
Difference Accumulation",
author = "Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2009",
abstract = "It has long been recognized that transfer function setup for
Direct Volume Rendering (DVR) is crucial to its usability.
However, the task of finding an appropriate transfer
function is complex and time-consuming even for experts.
Thus, in many practical applications simpler techniques
which do not rely on complex transfer functions are
employed. One common example is Maximum Intensity Projection
(MIP) which depicts the maximum value along each viewing
ray. In this paper, we introduce Maximum Intensity
Difference Accumulation (MIDA), a new approach which
combines the advantages of DVR and MIP. Like MIP, MIDA
exploits common data characteristics and hence does not
require complex transfer functions to generate good
visualization results. It does, however, feature occlusion
and shape cues similar to DVR. Furthermore, we show that
MIDA – in addition to being a useful technique in its own
right – can be used to smoothly transition between DVR and
MIP in an intuitive manner. MIDA can be easily implemented
using volume raycasting and achieves real-time performance
on current graphics hardware.",
month = jun,
journal = "Computer Graphics Forum",
volume = "28",
number = "3",
issn = "0167-7055",
pages = "775--782",
keywords = "illustrative visualization, maximum intensity projection,
direct volume rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/bruckner-2009-IVV/",
}
@inproceedings{piringer-2009-hds,
title = "Hierarchical Difference Scatterplots - Interactive Visual
Analysis of Data Cubes",
author = "Harald Piringer and M. Buchetics and Helwig Hauser and
Eduard Gr\"{o}ller",
year = "2009",
abstract = "Data cubes as employed by On-Line Analytical Processing
(OLAP) play a key role in many application domains. The
analysis typically involves to compare categories of
different hierarchy levels with respect to size and pivoted
values. Most existing visualization methods for pivoted
values, however, are limited to single hierarchy levels. The
main contribution of this paper is an approach called
Hierarchical Difference Scatterplot (HDS). A HDS allows for
relating multiple hierarchy levels and explicitly visualizes
differences between them in the context of the absolute
position of pivoted values. We discuss concepts of tightly
coupling HDS to other types of tree visualizations and
propose the integration in a setup of multiple views, which
are linked by interactive queries on the data. We evaluate
our approaches by analyzing social survey data in
collaboration with a domain expert.",
month = jun,
isbn = "978-1-60558-670-0",
publisher = "ACM",
location = "Paris, France",
editor = "Kai Puolam\"{a}ki",
booktitle = "Proceedings of the ACM SIGKDD Workshop on Visual Analytics
and Knowledge Discovery (VAKD",
pages = "56--65",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/piringer-2009-hds/",
}
@inproceedings{Reiter_2009_IXIA,
title = "Improvement of X-Ray image acquisition using a GPU based
3DCT simulation tool",
author = "Michael Reiter and Muhammad Muddassir Malik and Christoph
Heinzl and Dietmar Salaberger and Eduard Gr\"{o}ller and
Hubert Lettenbauer and Johann Kastner",
year = "2009",
abstract = "This paper presents a simulation tool for industrial X-Ray
computed tomography (CT) systems which is able to predict
the results of real measurements. Such a prediction helps
the technician in measurement technology to minimize
artefacts by using optimal measurement parameters and
therefore it helps to get more accurate results. The
presented simulation software offers an implementation for
CPU’s and GPU’s. The performance difference between
these implementa-tions is shown, for a specific test part.
Furthermore a parameter variation has been carried out, to
illustrate the influence of the acquisition settings. We use
a multi-image view tool to compare and evaluate the acquired
dataset series which contains CT data gained with different
X-Ray source voltages and a different number of projections.",
month = may,
note = "not peer reviewed, will appear",
location = "Wels, Austria",
booktitle = "International Conference on Quality Control by Artificial
Vision",
keywords = "Computed tomography, CT simulation, Industrial X-Ray Imaging",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/Reiter_2009_IXIA/",
}
@inproceedings{kohlmann-2009-cp,
title = "Contextual Picking of Volumetric Structures",
author = "Peter Kohlmann and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2009",
month = may,
isbn = "978-1-4244-4404-5",
location = "Peking, China",
editor = "Peter Eades, Thomas Ertl, Han-Wei Shen",
booktitle = "Proceedings of the IEEE Pacific Visualization Symposium 2009",
pages = "185--192",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/kohlmann-2009-cp/",
}
@inproceedings{solteszova-avp-2009,
title = "Advanced Volume Painting with Game Controllers",
author = "Veronika Solteszova and Maurice Termeer and Eduard
Gr\"{o}ller",
year = "2009",
month = apr,
location = "Budmerice, Slowakei",
booktitle = "Proceedings of the 25th Spring Conference on Computer
Graphics (SCCG)",
pages = "125--132",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/solteszova-avp-2009/",
}
@inproceedings{patel_2009_MC,
title = "Moment Curves",
author = "Daniel Patel and Martin Haidacher and Jean-Paul Balabanian
and Eduard Gr\"{o}ller",
year = "2009",
abstract = "We define a transfer function based on the first and second
statistical moments. We consider the evolution of the mean
and variance with respect to a growing neighborhood around a
voxel. This evolution defines a curve in 3D for which we
identify important trends and project it back to 2D. The
resulting 2D projection can be brushed for easy and robust
classification of materials and material borders. The
transfer function is applied to both CT and MR data.",
month = apr,
isbn = "978-1-4244-4404-5",
location = "Peking, China",
editor = "Peter Eades, Thomas Ertl, Han-Wei Shen",
booktitle = "Proceedings of the IEEE Pacific Visualization Symposium 2009",
pages = "201--208",
keywords = "Statistical Moments, Volume Classification, Statistics",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/patel_2009_MC/",
}
@article{malik-2009-CVFA,
title = "Computation and Visualization of Fabrication Artifacts",
author = "Muhammad Muddassir Malik and Christoph Heinzl and Eduard
Gr\"{o}ller",
year = "2009",
abstract = "This paper proposes a novel technique to measure fabrication
artifacts through direct comparison of a reference surface
model with the corresponding industrial CT volume. Our
technique uses the information from the surface model to
locate corresponding points in the CT dataset. We then
compute various comparison metrics to measure differences
(fabrication artifacts) between the two datasets. The
differences are presented to the user both visually as well
as quantitatively. Our comparison techniques are divided
into two groups, namely geometry-driven comparison
techniques and visual-driven comparison techniques. The
geometry-driven techniques provide an overview, while the
visual-driven techniques can be used for a localized
examination.",
month = feb,
journal = "Journal of WSCG",
volume = "17",
number = "1",
issn = "Online: 1213-6964 (printed: 1213 – 6972)",
pages = "17--24",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/malik-2009-CVFA/",
}
@inproceedings{glanznig-2009-LAMC,
title = "Locally Adaptive Marching Cubes through Iso-value Variation",
author = "Michael Glanznig and Muhammad Muddassir Malik and Eduard
Gr\"{o}ller",
year = "2009",
abstract = "We present a locally adaptive marching cubes algorithm. It
is a modification of the marching cubes algorithm where
instead of a global iso-value each grid point has its own
iso-value. This defines an iso-value field, which modifies
the case identification process in the algorithm. The
marching cubes algorithm uses linear interpolation to
compute intersections of the surface with the cell edges.
Our modification computes the intersection of two general
line segments, because there is no longer a constant
iso-value at each cube vertex. An iso-value field enables
the algorithm to correct biases within the dataset like low
frequency noise, contrast drifts, local density variations
and other artefacts introduced by the measurement process.
It can also be used for blending between different
isosurfaces (e.g., skin, veins and bone in a medical
dataset).",
month = feb,
isbn = "978-80-86943-93-0",
location = "Plzen, Tschechien",
editor = "Vaclav Skala",
booktitle = "Proceedings of the International Conference in Central
Europe on Computer Graphics, Visualization and Computer
Vision",
pages = "33--40",
keywords = "isosurface correction, iso-value field, contouring, marching
cubes, blending between isosurfaces",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/glanznig-2009-LAMC/",
}
@misc{termeer-2009-scmr,
title = "Patient-Specific Coronary Artery Supply Territory AHA
Diagrams",
author = "Maurice Termeer and Javier Oliv\'{a}n Besc\'{o}s and Marcel
Breeuwer and Anna Vilanova i Bartroli and Frans Gerritsen
and Eduard Gr\"{o}ller and Eike Nagel",
year = "2009",
abstract = "Introduction: The American Heart Association proposed a
17-segment model for the segmentation of the left ventricle
together with a mapping from each segment to a supplying
coronary artery. This proposal is based on population
averages. Several studies have confirmed the inaccuracy of
this mapping due to large anatomical variations of the
coronary arteries among individuals. Several proposals have
been made for a different mapping between the 17 segments
and the coronary arteries. Purpose: Due to the large
variation in coronary anatomy there is a need for a
patient-specific assignment of ventricular segments to
supplying coronary arteries. We propose to use a
segmentation of the coronary arteries and the ventricular
epicardium to compute this patient-specific mapping.
Methods: The three primary coronary arteries (LAD, LCX and
RCA) and the left ventricle are segmented in a whole-heart
MRI (SSFP) or CT scan of at least 150 slices. For the
coronary arteries we employ a semi-automatic vessel tracking
algorithm. The left ventricle is segmented using a fully
automatic approach. The epicardial surface of the resulting
segmentation is represented as a quadrilateral mesh. The
centerlines of the coronary arteries are projected on the
epicardial surface. A Voronoi diagram of the projected
arteries is computed using a geodesic distance metric. The
patient-specific coronary supply territories are computed
using a modified marching squares algorithm. The examples
given here consist of three territories, but our approach is
flexible enough to handle any amount of territories. Both
the coronary supply territories and the coronary arteries
are projected onto a bull’s eye plot using a
parameterization of the left ventricle based on cylindrical
coordinates, using the cardiac long axis as the primary axis
of the cylinder (Figure 1a). The continuous nature of the
epicardial surface is preserved in this projection. This
means that the bull’s eye plot does not consist of rings
representing slices, but that the distance to the center is
proportional to the distance to the apex. This bull’s eye
plot can for example be used as an overlay for the analysis
of viability (Figure 1b). Figure 1. (a) Bull’s eye plot
showing patient-specific coronary supply territories. The
dotted lines represent the 17-segment model. (b)
Patient-specific coronary supply territories as an overlay
on a bull’s eye plot of a late enhancement scan. Results:
We evaluated our method on image data from five patients.
For each patient we produced both a standard 17-segment
diagram and a diagram with the projection of the
patient-specific coronary supply territories resulting from
our approach. In both diagrams a projection of the segmented
coronary arteries was shown. We then asked an experienced
clinician to judge the correspondence between the coronary
arteries and the suggested coronary supply territories for
both diagrams. It was judged that our patient-specific
coronary supply territories provide a better correlation
with the position of the coronary arteries. The clinician
expressed a preference to our method as compared to the
standard 17-segment model. The continuous relation between
the distance to the center of the bull’s eye plot and the
distance to the apex caused some confusion with our
clinician. Especially in combination with CMR data
consisting of relatively few slices this relation should be
clarified. Conclusion: With our method the relation between
coronary arteries and areas supplied by these arteries is
better visualized. This will help to better correlate the
location of infarcted or ischemic areas to the coronaries
that have caused the respective infarction or ischemia.",
month = jan,
journal = "Journal of Cardiovascular Magnetic Resonance",
volume = "11",
series = "1",
location = "Orlando, Florida",
issn = "1532-429X ",
event = "SCMR 2009",
booktitle = "Abstracts of the 12th Annual SCMR Scientific Sessions - 2009",
Conference date = "Poster presented at SCMR 2009 (2009-01-29--2009-02-01)",
note = "164--165",
pages = "164 – 165",
keywords = "coronary supply territories, patient-specific bulls eye plot",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/termeer-2009-scmr/",
}
@talk{groeller-cvc-2009,
title = "Comprehensive Visualization of Cardiac MRI Data",
author = "Eduard Gr\"{o}ller",
year = "2009",
event = "AMI-ARCS 2009, 5th Workshop on Augmented Environments for
Medical Imaging including augmented Reality in
Computer-Aided Surgery",
location = "Imperial College London, UK",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/groeller-cvc-2009/",
}
@talk{groeller-svo-2009,
title = "(Scientific) Visualization: Overview and own Research
Contributions",
author = "Eduard Gr\"{o}ller",
year = "2009",
event = "Kolloquium an der Fakult\"{a}t f\"{u}r Informatik, Uni Wien",
location = "Wien, \"{O}sterreich",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/groeller-svo-2009/",
}
@talk{groeller-vks-2009,
title = "Visualization with Knowledge and Style",
author = "Eduard Gr\"{o}ller",
year = "2009",
event = "Keynote talk at International Conference in Central Europe
on Computer Graphics, Visualization and Computer Vision
(WSCG)",
location = "Plzen, Tschechien",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/groeller-vks-2009/",
}
@article{patel-2009-kav,
title = "Knowledge-assisted visualization of seismic data",
author = "Daniel Patel and Øyvind Sture and Helwig Hauser and
Christopher Giertsen and Eduard Gr\"{o}ller",
year = "2009",
issn = "0097-8493",
journal = "Computer & Graphics",
note = "Publisher: Elsevier",
number = "5",
volume = "33",
pages = "585--596",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/patel-2009-kav/",
}
@article{preim-2009-sve,
title = "Survey of the Visual Exploration and Analysis of Perfusion
Data",
author = "Bernhard Preim and Steffen Oeltze and Matej Mlejnek and
Eduard Gr\"{o}ller and Anja Hennemuth",
year = "2009",
issn = "1077-2626",
journal = "IEEE Transaction on Visualization and Computer Graphics",
number = "2",
volume = "15",
pages = "205--220",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/preim-2009-sve/",
}
@talk{groeller-scv-2009,
title = "Scientific Visualization",
author = "Eduard Gr\"{o}ller",
year = "2009",
event = "Dagstuhl Seminar 09251",
location = "Schloss Dagstuhl, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2009/groeller-scv-2009/",
}
@article{patel-2008-tsa,
title = "The Seismic Analyzer - Interpreting and Illustrating 2D
Seismic Data",
author = "Daniel Patel and Christopher Giertsen and John Thurmond and
John Gjelberg and Eduard Gr\"{o}ller",
year = "2008",
month = oct,
journal = "IEEE Transaction on Visualization and Computer Graphics",
volume = "14",
number = "6",
pages = "1571--1578",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/patel-2008-tsa/",
}
@inproceedings{haidacher-2008-vcbm,
title = "Information-based Transfer Functions for Multimodal
Visualization",
author = "Martin Haidacher and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2008",
abstract = "Transfer functions are an essential part of volume
visualization. In multimodal visualization at least two
values exist at every sample point. Additionally, other
parameters, such as gradient magnitude, are often retrieved
for each sample point. To find a good transfer function for
this high number of parameters is challenging because of the
complexity of this task. In this paper we present a general
information-based approach for transfer function design in
multimodal visualization which is independent of the used
modality types. Based on information theory, the complex
multi-dimensional transfer function space is fused to allow
utilization of a well-known 2D transfer function with a
single value and gradient magnitude as parameters.
Additionally, a quantity is introduced which enables better
separation of regions with complementary information. The
benefit of the new method in contrast to other techniques is
a transfer function space which is easy to understand and
which provides a better separation of different tissues. The
usability of the new approach is shown on examples of
different modalities.",
month = oct,
isbn = "978-3-905674-13-2",
publisher = "Eurographics Association",
location = "Delft",
issn = "2070-5778",
editor = "C.P Botha, G. Kindlmann, W.J. Niessen, and B. Preim",
booktitle = "VCBM ",
pages = "101--108",
keywords = "Multimodal Visualization, Transfer Function, Information
Theory",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/haidacher-2008-vcbm/",
}
@article{termeer-2008-vis,
title = "Visualization of Myocardial Perfusion Derived from Coronary
Anatomy",
author = "Maurice Termeer and Javier Oliv\'{a}n Besc\'{o}s and Marcel
Breeuwer and Anna Vilanova i Bartroli and Frans Gerritsen
and Eduard Gr\"{o}ller and Eike Nagel",
year = "2008",
abstract = "Visually assessing the effect of the coronary artery anatomy
on the perfusion of the heart muscle in patients with
coronary artery disease remains a challenging task. We
explore the feasibility of visualizing this effect on
perfusion using a numerical approach. We perform a
computational simulation of the way blood is perfused
throughout the myocardium purely based on information from a
three-dimensional anatomical tomographic scan. The results
are subsequently visualized using both three-dimensional
visualizations and bull's eye plots, partially inspired by
approaches currently common in medical practice. Our
approach results in a comprehensive visualization of the
coronary anatomy that compares well to visualizations
commonly used for other scanning technologies. We
demonstrate techniques giving detailed insight in blood
supply, coronary territories and feeding coronary arteries
of a selected region. We demonstrate the advantages of our
approach through visualizations that show information which
commonly cannot be directly observed in scanning data, such
as a separate visualization of the supply from each coronary
artery. We thus show that the results of a computational
simulation can be effectively visualized and facilitate
visually correlating these results to for example perfusion
data. ",
month = oct,
journal = "TVCG",
volume = "14",
number = "6",
issn = "1077-2626",
pages = "1595--1602",
keywords = "myocardial perfusion, coronary artery territories, cardiac
visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/termeer-2008-vis/",
}
@inproceedings{heinzl-2008-sam,
title = "Statistical Analysis of Multi-Material Components using Dual
Energy CT",
author = "Christoph Heinzl and Johann Kastner and Torsten M\"{o}ller
and Eduard Gr\"{o}ller",
year = "2008",
month = oct,
isbn = "978-3-89838-609-8",
location = "Konstanz, Deutschland",
editor = "Oliver Deussen, Daniel Keim, Dietmar Saupe",
booktitle = "VMV 2008, Vision, Modeling and Visualization",
pages = "179--188",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/heinzl-2008-sam/",
}
@inproceedings{balabanian-2008-hvv,
title = "Hierarchical Volume Visualization of Brain Anatomy",
author = "Jean-Paul Balabanian and Martin Ystad and Ivan Viola and
Arvid Lundervold and Helwig Hauser and Eduard Gr\"{o}ller",
year = "2008",
month = oct,
isbn = "978-3-89838-609-8",
location = "Konstanz, Deutschland",
editor = "Oliver Deussen, Daniel Keim, Dietmar Saupe",
booktitle = "VMV 2008, Vision, Modeling and Visualization",
pages = "313--322",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/balabanian-2008-hvv/",
}
@inproceedings{fuchs-2008-del,
title = "Delocalized Unsteady Vortex Region Detectors",
author = "Raphael Fuchs and Ronald Peikert and Filip Sadlo and Bilal
Alsallakh and Eduard Gr\"{o}ller",
year = "2008",
abstract = "In this paper we discuss generalizations of instantaneous,
local vortex criteria. We incorporate information on spatial
context and temporal development into the detection process.
The presented method is generic in so far that it can extend
any given Eulerian criterion to take the Lagrangian approach
into account. Furthermore, we present a visual aid to
understand and steer the feature extraction process. We show
that the delocalized detectors are able to distinguish
between connected vortices and help understanding regions of
multiple interacting vortex structures. The delocalized
detectors extract smoother structures and reduce noise in
the vortex detection result.",
month = oct,
isbn = "978-3-89838-609-8",
location = "Konstanz, Deutschland",
editor = "Oliver Deussen, Daniel Keim, Dietmar Saupe",
booktitle = "Proceedings VMV 2008",
pages = "81--90",
keywords = "anisotropic filtering, vortex detection, interactive visual
analysis",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/fuchs-2008-del/",
}
@article{suntinger-2008-etet,
title = "Event Tunnel: Exploring Event-Driven Business Processes",
author = "Martin Suntinger and Hannes Obweger and Josef Schuh and
Eduard Gr\"{o}ller",
year = "2008",
month = sep,
issn = "0272-1716",
journal = "IEEE Computer Graphics and Applications",
number = "5",
volume = "28",
pages = "46--55",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/suntinger-2008-etet/",
}
@article{vucini_2008_rnp,
title = "Efficient Reconstruction from Non-uniform Point Sets",
author = "Erald Vucini and Torsten M\"{o}ller and Eduard Gr\"{o}ller",
year = "2008",
abstract = "We propose a method for non-uniform reconstruction of 3D
scalar data. Typically, radial basis functions,
trigonometric polynomials or shift-invariant functions are
used in the functional approximation of 3D data. We adopt a
variational approach for the reconstruction and rendering of
3D data. The principle idea is based on data fitting via
thin-plate splines. An approximation by B-splines offers
more compact support for fast reconstruction. We adopt this
method for large datasets by introducing a block-based
reconstruction approach. This makes the method practical for
large data sets. Our reconstruction will be smooth across
blocks. We give reconstruction measurements as error
estimations based on different parameter settings and also
an insight on the computational effort. We show that the
block size used in reconstruction has a negligible effect on
the reconstruction error. Finally we show rendering results
to emphasize the quality of this 3D reconstruction
technique.",
month = jul,
journal = "The Visual Computer",
volume = "24",
number = "7-9",
note = "http://www.springerlink.com/content/r8578865643x0061/",
issn = "0178-2789 (Print) 1432-2315 (Online)",
pages = "555--563",
keywords = "3D Object Modeling, Non-uniform Reconstruction, Variational
Approximation, B-splines",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/vucini_2008_rnp/",
}
@misc{balabanian-2008-tst,
title = "Temporal Styles for Time-Varying Volume Data",
author = "Jean-Paul Balabanian and Ivan Viola and Torsten M\"{o}ller
and Eduard Gr\"{o}ller",
year = "2008",
abstract = "This paper introduces interaction mechanisms for conveying
temporal characteristics of time-varying volume data based
on temporal styles. We demonstrate the flexibility of the
new concept through different temporal style transfer
function types and we define a set of temporal compositors
as operators on them. The data is rendered by a multi-volume
GPU raycaster that does not require any grid alignment over
the individual time-steps of our data nor a rectilinear grid
structure. The paper presents the applicability of the new
concept on different data sets from partial to full voxel
alignment with rectilinear and curvilinear grid layout.",
month = jun,
note = "POSTER PRESENTATION",
location = "Atlanta, Georgia, USA",
editor = "Stephan Gumhold, Jana Kosecka and Oliver Staadt",
booktitle = "Proceedings of 3DPVT",
Conference date = "Poster presented at (2008-06-18--2008-06-20)",
note = "81--89",
pages = "81 – 89",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/balabanian-2008-tst/",
}
@article{Rautek-2008-IDS,
title = "Interaction-Dependent Semantics for Illustrative Volume
Rendering",
author = "Peter Rautek and Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2008",
abstract = "In traditional illustration the choice of appropriate styles
and rendering techniques is guided by the intention of the
artist. For illustrative volume visualizations it is
difficult to specify the mapping between the 3D data and the
visual representation that preserves the intention of the
user. The semantic layers concept establishes this mapping
with a linguistic formulation of rules that directly map
data features to rendering styles. With semantic layers
fuzzy logic is used to evaluate the user defined
illustration rules in a preprocessing step. In this paper we
introduce interaction-dependent rules that are evaluated for
each frame and are therefore computationally more expensive.
Enabling interaction-dependent rules, however, allows the
use of a new class of semantics, resulting in more
expressive interactive illustrations. We show that the
evaluation of the fuzzy logic can be done on the graphics
hardware enabling the efficient use of interaction-dependent
semantics. Further we introduce the flat rendering mode and
discuss how different rendering parameters are influenced by
the rule base. Our approach provides high quality
illustrative volume renderings at interactive frame rates,
guided by the specification of illustration rules.",
month = may,
journal = "Computer Graphics Forum",
volume = "27",
number = "3",
pages = "847--854",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/Rautek-2008-IDS/",
}
@inproceedings{bruckner-2008-IVV,
title = "Integrating Volume Visualization Techniques Into Medical
Applications",
author = "Stefan Bruckner and Peter Kohlmann and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2008",
abstract = "One of the main obstacles in integrating 3D volume
visualization in the clinical workflow is the time-consuming
process of adjusting parameters such as viewpoint, transfer
functions, and clipping planes required to generate a
diagnostically relevant image. Current applications
therefore make scarce use of volume rendering and instead
primarily employ 2D views generated through standard
techniques such as multi-planar reconstruction (MPR).
However, in many cases 3D renditions can supply additional
useful information. This paper discusses ongoing work which
aims to improve the integration of 3D visualization into the
diagnostic workflow by automatically generating meaningful
renditions based on minimal user interaction. A method for
automatically generating 3D views for structures in 2D
slices based on a single picking interaction is presented.",
month = may,
isbn = "978-1-4244-2002-5",
location = "Paris, Frankreich",
booktitle = "Proceedings of 5th IEEE International Symposium on
Biomedical Imaging: From Nano to Macro",
pages = "820--823",
keywords = "viewpoint selection, medical visualization, volume rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/bruckner-2008-IVV/",
}
@inproceedings{kohlmann-2008-lse,
title = "LiveSync++: Enhancements of an Interaction Metaphor",
author = "Peter Kohlmann and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2008",
abstract = "The LiveSync interaction metaphor allows an efficient and
non-intrusive integration of 2D and 3D visualizations in
medical workstations. This is achieved by synchronizing the
2D slice view with the volumetric view. The synchronization
is initiated by a simple picking on a structure of interest
in the slice view. In this paper we present substantial
enhancements of the existing concept to improve its
usability. First, an efficient parametrization for the
derived parameters is presented, which allows hierarchical
refinement of the search space for good views. Second, the
extraction of the feature of interest is performed in a way,
which is adapting to the volumetric extent of the feature.
The properties of the extracted features are utilized to
adjust a predefined transfer function in a feature-enhancing
manner. Third, a new interaction mode is presented, which
allows the integration of more knowledge about the
user-intended visualization, without increasing the
interaction effort. Finally, a new clipping technique is
integrated, which guarantees an unoccluded view on the
structure of interest while keeping important contextual
information.",
month = may,
location = "Windsor, Ontario, Canada",
booktitle = "Proceedings of Graphics Interface 2008",
pages = "81--88",
keywords = "Viewpoint Selection, Linked Views, Medical Visualization,
Smart Interaction",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/kohlmann-2008-lse/",
}
@inproceedings{suntinger-2008-tet,
title = "The Event Tunnel: Interactive Visualization of Complex Event
Streams for Business Process Pattern Analysis",
author = "Martin Suntinger and Hannes Obweger and Josef Schuh and
Eduard Gr\"{o}ller",
year = "2008",
month = mar,
isbn = "978-1-4244-1966-1",
location = "Kyoto, Japan",
booktitle = "IEEE PacificVIS ",
pages = "111--118",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/suntinger-2008-tet/",
}
@misc{termeer-2008-scmr,
title = "The Volumetric Bulls Eye Plot",
author = "Maurice Termeer and Javier Oliv\'{a}n Besc\'{o}s and Marcel
Breeuwer and Anna Vilanova i Bartroli and Frans Gerritsen
and Eduard Gr\"{o}ller",
year = "2008",
abstract = "Introduction: The bull's eye plot is a commonly used
schematic for the visualization of quantitative late
enhancement cardiac MRI data. It gives an intuitive overview
of the viability of the entire left ventricular myocardium
in a single diagram. However, common implementations do not
provide a continuous transition between slices and provide
poor or no information about the exact location and
transmurality of non-viable tissue. Purpose: We propose a
novel visualization technique that relieves the drawbacks of
the bull's eye plot but maintains its advantages. Our
hypothesis is that our technique will enable a more accurate
assessment of the relation between viable and non-viable
myocardial tissue (scar). Methods: Short-axis late
enhancement cardiac MRI acquisitions consist of 10-20
slices. We segment the left-ventricular myocardium in all
slices using manually drawn contours on both the epicardium
and the endocardium. The segmented myocardium is
subsequently unfolded along the long axis and reformatted to
form a thin cylinder (Figure 1a). In this process myocardial
cross-sections are mapped to equidistant rings within this
cylinder. The volumetric nature of the myocardium is
preserved during the unfolding. A projection of the cylinder
is generated using the technique of volume rendering (Figure
1b). The viewing direction in this projection is oriented
from the apex towards the base of the ventricle. This makes
the viewer perceive the endocardium to be behind the
epicardium. This view is further augmented with the main
coronary arteries extracted from a whole heart MRI scan (150
slices, SSFP). Furthermore, two dots indicating the points
where the left and right-ventricular myocardial connect are
added. A thin slab perpendicular to the long axis within the
cylinder can be selected for exclusive rendering, providing
a method of visualizing only epicardial or endocardial
viability. To investigate scar transmurality, the user can
select a wedge-shaped region of interest. Figure 1c shows
the transmurality of that region by projecting it from its
side. The unfolding method is modified for this projection
to compensate for distortions due to the shape of the
selected region. Since the wall thickness may vary within
the region of interest, lines indicating the minimum and
maximum wall thickness in the selected region are displayed.
Results: The long-axis projection provides a smooth overview
of the viability due to the unfolding method that preserves
the continuous, volumetric nature of the myocardium. This
also causes the resolution of the diagram to increase when
more slices are acquired. The additional context information
(i.e., coronary arteries) allows for easier interpretation
of the location of any scar. Due to the close relation to
the bull's eye plot, we believe that clinical adoption will
be easy. The transmurality view provides detailed
information on the distribution of scar within the
myocardium. The preservation of wall thickness allows for
judgment of the location and extent of the scar in relation
to healthy tissue. Conclusion: Our novel volumetric bull's
eye plot allows for a comprehensive assessment of viability
and scar transmurality thanks to its continuous nature and
the additional context information provided. ",
month = feb,
journal = "Journal of Cardiovascular Magnetic Resonance",
volume = "11",
series = "1",
location = "Los Angeles, California",
event = "SCMR 2008",
booktitle = "Abstracts of the 11th Annual SCMR Scientific Sessions –
2008",
Conference date = "Poster presented at SCMR 2008 (2008-02-08--2008-02-10)",
note = "199--200",
pages = "199 – 200",
keywords = "Viability, Bulls Eye Plot, Cardiac MRI",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/termeer-2008-scmr/",
}
@talk{groeller-2008-How,
title = "How to do a Successful PhD (in Visualization)",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "Seminar of the Research School in Information and
Communication Technology, University of Bergen",
location = "Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-How/",
}
@talk{groeller-2008-irs,
title = "Illustrative Rendering with Style",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "Kolloquium an der Technisch-Naturwissenschaftlichen
Fakult\"{a}t",
location = "Johannes Kepler Universit\"{a}t Linz, Austria",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-irs/",
}
@talk{groeller-2008-kav3,
title = "Knowledge-Assisted Visualization",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "Department Seminar at the Department of Informatics",
location = "University of Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-kav3/",
}
@talk{groeller-2008-lsy,
title = "LiveSync: An Interactive Metaphor for Knowledge-Based
Navigation in Medical Visualization",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "MedViz Seminar",
location = "University of Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-lsy/",
}
@misc{Rautek-2008-VF,
title = "Illustrative Visualization – New Technology or Useless
Tautology?",
author = "Peter Rautek and Stefan Bruckner and Eduard Gr\"{o}ller and
Ivan Viola",
year = "2008",
abstract = "This article can be accessed online in the ACM SIGGRAPH,
Computer Graphics Quarterly, Volume 42, Number 3:
http://www.siggraph.org/publications/newsletter/volume-42-number-3/illustrative-visualization-2013-new-technology-or-useless-tautology",
note = "online journal, without talk",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/Rautek-2008-VF/",
}
@talk{groeller-2008-att2,
title = "Visualisierung -- aktuelle Themen und Trends",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "Kolloquium an der Donau-Universit\"{a}t Krems",
location = "Krems, Austria",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-att2/",
}
@talk{groeller-2008-hsp,
title = "How to do a Successful PhD (in Visualization)",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "Seminar of the Research School in Information and
Communication Technology",
location = "University of Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-hsp/",
}
@talk{groeller-2008-kav2,
title = "Knowledge-Assisted Visualization",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "Colloquium - Department of Computer Science and Engineering",
location = "Arizona State University",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-kav2/",
}
@talk{groeller-2008-kav4,
title = "Knowledge-Assisted Visualization",
author = "Eduard Gr\"{o}ller",
year = "2008",
event = "18th Congreso Espñol de Inform\'{a}tica Gr\'{a}fica (CEIG
2008)",
location = "Barcelona, Spain",
URL = "https://www.cg.tuwien.ac.at/research/publications/2008/groeller-2008-kav4/",
}
@article{heinzl-2007-sem,
title = "Surface Extraction from Multi-Material Components for
Metrology using Dual Energy CT",
author = "Christoph Heinzl and Johann Kastner and Eduard Gr\"{o}ller",
year = "2007",
month = nov,
journal = "IEEE Transaction on Visualization and Computer Graphics",
volume = "13",
number = "6",
issn = "1077-2626 ",
pages = "1520--1527",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/heinzl-2007-sem/",
}
@inproceedings{patel_daniel_2007_IRSD,
title = "Illustrative Rendering of Seismic Data",
author = "Daniel Patel and Christopher Giertsen and John Thurmond and
Eduard Gr\"{o}ller",
year = "2007",
abstract = "In our work we present techniques for illustrative rendering
of interpreted seismic volume data by adopting elements from
geology book illustrations. We also introduce combined
visualization techniques of interpreted and uninterpreted
data for validation, comparison and interdisciplinary
communication reasons. We introduce the concept of smooth
transitions between these two semantical levels. To achieve
this we present transfer functions that map seismic volume
attributes to 2D textures that flow according to a
deformation volume describing the buckling and
discontinuities of the layers of the seismic data.",
month = nov,
location = "Saarbr\"{u}cken, Germany",
editor = "Hendrik. Lensch, Bodo Rosenhahn, H.P. Seidel",
booktitle = "Proceeding of Vision Modeling and Visualization 2007",
journal = "Vision, Modelling and Visualization",
pages = "13--22",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/patel_daniel_2007_IRSD/",
}
@article{kohlmann-2007-livesync,
title = "LiveSync: Deformed Viewing Spheres for Knowledge-Based
Navigation",
author = "Peter Kohlmann and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2007",
abstract = "Although real-time interactive volume rendering is available
even for very large data sets, this visualization method is
used quite rarely in the clinical practice. We suspect this
is because it is very complicated and time consuming to
adjust the parameters to achieve meaningful results. The
clinician has to take care of the appropriate viewpoint,
zooming, transfer function setup, clipping planes and other
parameters. Because of this, most often only 2D slices of
the data set are examined. Our work introduces LiveSync, a
new concept to synchronize 2D slice views and volumetric
views of medical data sets. Through intuitive picking
actions on the slice, the users define the anatomical
structures they are interested in. The 3D volumetric view is
updated automatically with the goal that the users are
provided with expressive result images. To achieve this live
synchronization we use a minimal set of derived information
without the need for segmented data sets or data-specific
pre-computations. The components we consider are the picked
point, slice view zoom, patient orientation, viewpoint
history, local object shape and visibility. We introduce
deformed viewing spheres which encode the viewpoint quality
for the components. A combination of these deformed viewing
spheres is used to estimate a good viewpoint. Our system
provides the physician with synchronized views which help to
gain deeper insight into the medical data with minimal user
interaction.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "13",
number = "6",
note = "to be presented at IEEE Visualization 2007",
pages = "1544--1551",
keywords = "linked views, interaction, medical visualization,
navigation, viewpoint selection",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/kohlmann-2007-livesync/",
}
@article{bruckner-2007-EDF,
title = "Enhancing Depth-Perception with Flexible Volumetric Halos",
author = "Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2007",
abstract = "Volumetric data commonly has high depth complexity which
makes it difficult to judge spatial relationships
accurately. There are many different ways to enhance depth
perception, such as shading, contours, and shadows. Artists
and illustrators frequently employ halos for this purpose.
In this technique, regions surrounding the edges of certain
structures are darkened or brightened which makes it easier
to judge occlusion. Based on this concept, we present a
flexible method for enhancing and highlighting structures of
interest using GPU-based direct volume rendering. Our
approach uses an interactively defined halo transfer
function to classify structures of interest based on data
value, direction, and position. A feature-preserving
spreading algorithm is applied to distribute seed values to
neighboring locations, generating a controllably smooth
field of halo intensities. These halo intensities are then
mapped to colors and opacities using a halo profile
function. Our method can be used to annotate features at
interactive frame rates.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "13",
number = "6",
pages = "1344--1351",
keywords = "volume rendering, illustrative visualization, halos",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/bruckner-2007-EDF/",
}
@article{termeer-2007-covicad,
title = "CoViCAD: Comprehensive Visualization of Coronary Artery
Disease",
author = "Maurice Termeer and Javier Oliv\'{a}n Besc\'{o}s and Marcel
Breeuwer and Anna Vilanova i Bartroli and Frans Gerritsen
and Eduard Gr\"{o}ller",
year = "2007",
abstract = "We present novel, comprehensive visualization techniques for
the diagnosis of patients with Coronary Artery Disease using
segmented cardiac MRI data. We extent an accepted medical
visualization technique called the bull’s eye plot by
removing discontinuities, preserving the volumetric nature
of the left ventricular wall and adding anatomical context.
The resulting volumetric bull’s eye plot can be used for
the assessment of transmurality. We link these
visualizations to a 3D view that presents viability
information in a detailed anatomical context. We combine
multiple MRI scans (whole heart anatomical data, late
enhancement data) and multiple segmentations (polygonal
heart model, late enhancement contours, coronary artery
tree). By selectively combining different rendering
techniques we obtain comprehensive yet intuitive
visualizations of the various data sources.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics
(accepted for publication)",
volume = "13",
number = "6",
keywords = "VBEP, viability, late enhancement, Cardiac MRI, bull",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/termeer-2007-covicad/",
}
@article{Rautek-2007-SLI,
title = "Semantic Layers for Illustrative Volume Rendering",
author = "Peter Rautek and Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2007",
abstract = "Direct volume rendering techniques map volumetric attributes
(e.g., density, gradient magnitude, etc.) to visual styles.
Commonly this mapping is specified by a transfer function.
The specification of transfer functions is a complex task
and requires expert knowledge about the underlying rendering
technique. In the case of multiple volumetric attributes and
multiple visual styles the specification of the
multi-dimensional transfer function becomes more challenging
and non-intuitive. We present a novel methodology for the
specification of a mapping from several volumetric
attributes to multiple illustrative visual styles. We
introduce semantic layers that allow a domain expert to
specify the mapping in the natural language of the domain.
A semantic layer defines the mapping of volumetric
attributes to one visual style. Volumetric attributes and
visual styles are represented as fuzzy sets. The mapping is
specified by rules that are evaluated with fuzzy logic
arithmetics. The user specifies the fuzzy sets and the rules
without special knowledge about the underlying rendering
technique. Semantic layers allow for a linguistic
specification of the mapping from attributes to visual
styles replacing the traditional transfer function
specification.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "13",
number = "6",
note = "to be presented at IEEE Visualization 2007",
pages = "1336--1343",
keywords = "Illustrative Visualization, Volume Visualization,
Focus+Context Techniques",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/Rautek-2007-SLI/",
}
@inproceedings{toth-2007-ndd,
title = "N-dimensional Data-Dependent Reconstruction Using
Topological Changes",
author = "Zsolt Toth and Ivan Viola and Andrej Ferko and Eduard
Gr\"{o}ller",
year = "2007",
abstract = "We introduce a new concept for a geometrically based feature
preserving reconstruction technique of n-dimensional
scattered data. Our goal is to generate an n-dimensional
triangulation, which preserves the high frequency regions
via local topology changes. It is the generalization of a 2D
reconstruction approach based on data-dependent
triangulation and Lawson‘s optimization procedure. The
definition of the mathematic optimum of the reconstruction
is given. We discuss an original cost function and a
generalization of known functions for the n-dimensional
case.",
month = sep,
publisher = "Springer",
note = "Konferenz hat 2005 stattgefunden, Proceeding ist allerdings
erst 2007 erschienen",
location = "Budmerice, Slovakia",
editor = "H. Hauser, H. Hagen, H. Theisel",
booktitle = "Proceedings of TopoInVis 2005, Topology-based Methods in
Visualization",
pages = "183--198",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/toth-2007-ndd/",
}
@inproceedings{viola-2007-ort,
title = "On the Role of Topology in Focus+Context Visualization",
author = "Ivan Viola and Eduard Gr\"{o}ller",
year = "2007",
abstract = "In this paper three types of visualization scenarios are
discussed, where topology improves the readability of
particular visualization results. The rst type combines
topology information represented by simple graphical
primitives with other forms of visual representations. The
second type uses the topology information to dene the
relevance of objects within the data. The relevance is re
ected in the visualization by applying the cut-away concept.
The third type of visualizations is based on the change of
topology of the underlying data to increase visibility of
the most interesting information. Every type handles
topology in a dierent way. This illustrates various roles
of topology in scientic visualization.",
month = sep,
publisher = "Springer",
note = "Konferenz hat 2005 stattgefunden, Proceeding ist allerdings
erst 2007 erschienen",
location = "Budmerice, Slovakia",
editor = "H. Hauser, H. Hagen, H. Theisel",
booktitle = "Proceedings of TopoInVis 2005, Topology-based Methods in
Visualization",
pages = "171--181",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/viola-2007-ort/",
}
@article{bruckner-2007-STF,
title = "Style Transfer Functions for Illustrative Volume Rendering",
author = "Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2007",
abstract = "Illustrative volume visualization frequently employs
non-photorealistic rendering techniques to enhance important
features or to suppress unwanted details. However, it is
difficult to integrate multiple non-photorealistic rendering
approaches into a single framework due to great differences
in the individual methods and their parameters. In this
paper, we present the concept of style transfer functions.
Our approach enables flexible data-driven illumination which
goes beyond using the transfer function to just assign
colors and opacities. An image-based lighting model uses
sphere maps to represent non-photorealistic rendering
styles. Style transfer functions allow us to combine a
multitude of different shading styles in a single rendering.
We extend this concept with a technique for
curvature-controlled style contours and an illustrative
transparency model. Our implementation of the presented
methods allows interactive generation of high-quality
volumetric illustrations.",
month = sep,
journal = "Computer Graphics Forum",
volume = "26",
number = "3",
note = "Eurographics 2007 3rd Best Paper Award",
pages = "715--724",
keywords = "illustrative visualization, transfer functions, volume
rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/bruckner-2007-STF/",
}
@article{roos-2007-mcp,
title = "Multipath Curved Planar Reformation of the Peripheral
Arterial Tree in CT Angiography",
author = "J Roos and Dominik Fleischmann and A Koechl and T Rakshe and
Mat\'{u}s Straka and A Napoli and Armin Kanitsar and Milos
Sramek and Eduard Gr\"{o}ller",
year = "2007",
month = jul,
journal = "Journal Radiology",
number = "1",
volume = "244",
pages = "281--290",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/roos-2007-mcp/",
}
@inproceedings{balabanian-2007-ant,
title = "Sonar Explorer: A New Tool for Visualization of Fish Schools
from 3D Sonar Data",
author = "Jean-Paul Balabanian and Ivan Viola and Egil Ona and Ruben
Patel and Eduard Gr\"{o}ller",
year = "2007",
abstract = "We present a novel framework for analysis and visualization
of fish schools in 3D sonar surveys. The 3D sonar technology
is new and there have not been applications to visualize the
data in 3D. We have created an application called Sonar
Explorer that satisfies the requirements of domain
scientists. Sonar Explorer provides easy and intuitive
semi-automatic fish school tracking and survey map
generation. The overall pipeline is described and all
pipeline stages relevant for visualization are highlighted.
We present techniques to deal with 3D sonar data specifics:
highly anisotropic volume data aligned on a curvilinear
grid. Domain scientists provide initial impressions on
interaction and outlook.",
month = may,
isbn = "9783905673456",
publisher = "IEEE",
location = "Nork\"{o}pping, Schweden",
editor = "K. Museth, T. M\"{o}ller, A. Ynnerman",
booktitle = "Data Visualization - EuroVis 2007",
pages = "155--162",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/balabanian-2007-ant/",
}
@inproceedings{malik-2007-FP,
title = "Feature Peeling",
author = "Muhammad Muddassir Malik and Torsten M\"{o}ller and Eduard
Gr\"{o}ller",
year = "2007",
abstract = "We present a novel rendering algorithm that analyses the ray
profiles along the line of sight. The profiles are
subdivided according to encountered peaks and valleys at so
called transition points. The sensitivity of these
transition points is calibrated via two thresholds. The
slope threshold is based on the magnitude of a peak
following a valley, while the peeling threshold measures the
depth of the transition point relative to the neighboring
rays. This technique separates the dataset into a number of
feature layers. The user can scroll through the layers
inspecting various features from the current view position.
While our technique has been inspired by opacity peeling
approach, we demonstrate that we can reveal detectable
features even in the third and fourth layers for both CT and
MRI datasets.",
month = may,
isbn = "978-1-56881-337-0",
publisher = "A K Peters Ltd",
address = "Favoritenstrasse 9-11 / E186, A-1040 Wien, Austria",
booktitle = "Proceedings of Graphics Interface 2007",
pages = "273--280",
keywords = "volume visualization, ray analysis, feature peeling",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/malik-2007-FP/",
}
@inproceedings{burns-2007-fea,
title = "Feature Emphasis and Contextual Cutaways for Multimodal
Medical Visualization",
author = "Michael Burns and Martin Haidacher and Wolfgang Wein and
Ivan Viola and Eduard Gr\"{o}ller",
year = "2007",
abstract = "Dense clinical data like 3D Computed Tomography (CT) scans
can be visualized together with real-time imaging for a
number of medical intervention applications. However, it is
difficult to provide a fused visualization that allows
sufficient spatial perception of the anatomy of interest, as
derived from the rich pre-operative scan, while not
occluding the real-time image displayed embedded within the
volume. We propose an importance-driven approach that
presents the embedded data such that it is clearly visible
along with its spatial relation to the surrounding
volumetric material. To support this, we present and
integrate novel techniques for importance specification,
feature emphasis, and contextual cutaway generation. We show
results in a clinical context where a pre-operative CT scan
is visualized alongside a tracked ultrasound image, such
that the important vasculature is depicted between the
viewpoint and the ultrasound image, while a more opaque
representation of the anatomy is exposed in the surrounding
area.",
month = may,
isbn = "9783905673456",
publisher = "IEEE",
location = "Nork\"{o}pping, Schweden",
editor = "K. Museth, T. M\"{o}ller, A. Ynnerman",
booktitle = "Proceedings of Eurographics / IEEE VGTC Symposium on
Visualization (EuroVis 2007)",
pages = "275--282",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/burns-2007-fea/",
}
@inproceedings{vucini_erald-2007-FRI,
title = "Face Recognition under Varying Illumination",
author = "Erald Vucini and Muhittin G\"{o}kmen and Eduard Gr\"{o}ller",
year = "2007",
abstract = "This paper proposes a novel pipeline to develop a Face
Recognition System robust to illumination variation. We
consider the case when only one single image per person is
available during the training phase. In order to utilize the
superiority of Linear Discriminant Analysis (LDA) over
Principal Component Analysis (PCA) in regard to variable
illumination, a number of new images illuminated from
different directions are synthesized from a single image by
means of the Quotient Image. Furthermore, during the testing
phase, an iterative algorithm is used for the restoration of
frontal illumination of a face illuminated from any
arbitrary angle. Experimental results on the YaleB database
show that our approach can achieve a top recognition rate
compared to existing methods and can be integrated into real
time face recognition system.",
month = jan,
isbn = "978-80-86943-01-5",
series = "WSCG’2007 Full Papers Proceedings",
publisher = "University of West Bohemia",
organization = "WSCG",
note = "Full Paper",
location = "Plzen, Czech Republic",
address = "University of West Bohemia, Univerzitni 8, Box 314, CZ 306
14 Plzen, Czech Republic",
editor = "Vaclav Skala",
booktitle = "15th WSCG 2007",
pages = "57--64",
keywords = "Dimensionality Reduction, Face Recognition, Image Synthesis,
Illumination Restoration",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/vucini_erald-2007-FRI/",
}
@article{Kohlmann-2007-EBV,
title = "Evaluation of a Bricked Volume Layout for a Medical
Workstation based on Java",
author = "Peter Kohlmann and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2007",
abstract = "Volumes acquired for medical examination purposes are
constantly increasing in size. For this reason, the
computer’s memory is the limiting factor for visualizing
the data. Bricking is a well-known concept used for
rendering large data sets. The volume data is subdivided
into smaller blocks to achieve better memory utilization.
Until now, the vast majority of medical workstations use a
linear volume layout. We implemented a bricked volume layout
for such a workstation based on Java as required by our
collaborative company partner to evaluate different common
access patterns to the volume data. For rendering, we were
mainly interested to see how the performance will differ
from the traditional linear volume layout if we generate
images of arbitrarily oriented slices via Multi-Planar
Reformatting (MPR). Furthermore, we tested access patterns
which are crucial for segmentation issues like a random
access to data values and a simulated region growing. Our
goal was to find out if it makes sense to change the volume
layout of a medical workstation to benefit from bricking. We
were also interested to identify the tasks where problems
might occur if bricking is applied. Overall, our results
show that it is feasible to use a bricked volume layout in
the stringent context of a medical workstation implemented
in Java.",
month = jan,
journal = "Journal of WSCG",
volume = "15",
number = "1-3",
issn = "1213-6972",
pages = "83--90",
keywords = "MPR, Bricked Volume Layout, Medical Visualization, Medical
Workstation",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/Kohlmann-2007-EBV/",
}
@misc{Rautek-2007-O3D,
title = "Caricaturistic Visualization of Deformation Data Based on
High Density Point Clouds",
author = "Peter Rautek and Alexander Reiterer and Eduard Gr\"{o}ller",
year = "2007",
abstract = "Modern deformation monitoring techniques offer possibilities
to measure and analyze deformation processes in detail.
There are various different sensor systems on the market
that can be used in these application fields, each having
specific features in terms of accuracy, robustness, user
interaction, operational range, measurement speed and
frequency, resolution, or other relevant parameters. The
selection of an appropriate sensor system for a particular
application is not trivial. In recent years research on
image-based measurement systems and laser scanners has
gained increasing interest – in many cases a combination
of different sensors has advantages over a single-sensor
system (e.g. different accuracy and reliability classes,
different measurement range, etc.). The point clouds
produced by such systems potentially consist of a vast
number of points. One of the main problems concerning the
analysis and interpretation of deformation measurements is
the visualization of the data respectively of the underlying
deformation. In this paper we present the application of the
recently developed caricaturistic visualization method to
deformation data based on high density point clouds.
Caricaturistic visualization depicts the deformation data in
an exaggerated way. The exaggeration of the deformation
accents subtle deviations and supports the viewer for the
correct interpretation of the underlying deformation. We
show results for facade deformation data as well as for
landslide data. ",
booktitle = "8th Conference on Optical 3-D Measurement Techniques,
Zurich, Switzerland",
Conference date = "Poster presented at (2007-07-09--2007-07-12)",
keywords = "Point Cloud, Deformation Measurement, Visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/Rautek-2007-O3D/",
}
@talk{groeller-2007-fci,
title = "Focus+Context in Illustrative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2007",
event = "Keynote talk at TPCG 07",
location = "University of Wales, Bangor, UK",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/groeller-2007-fci/",
}
@talk{groeller-2007-vis,
title = "Visualization -- I see it my way",
author = "Eduard Gr\"{o}ller",
year = "2007",
event = "NorVis 2007",
location = "University of Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/groeller-2007-vis/",
}
@talk{groeller-2007-vws,
title = "Visualization with Style",
author = "Eduard Gr\"{o}ller",
year = "2007",
event = "Distinguished Lecture Series",
location = "Scientific Computing and Imaging Institute, University of
Utah",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/groeller-2007-vws/",
}
@talk{groeller-2007-csu,
title = "Computational Science -- \"{U}berblick und eigene
Forschungsleistungen",
author = "Eduard Gr\"{o}ller",
year = "2007",
event = "eingeladener Gastvortrag an der Fakult\"{a}t f\"{u}r
Informatik",
location = "Technische Universit\"{a}t Wien",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/groeller-2007-csu/",
}
@talk{groeller-2007-mva,
title = "Medical Visualization: Articular Cartilage Visualization and
other Examples",
author = "Eduard Gr\"{o}ller",
year = "2007",
event = "Bergen Bildebehandlings Gruppe (BBG) Seminar",
location = "Dep. of Mathematics, University of Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/groeller-2007-mva/",
}
@talk{groeller-2007-visII,
title = "Visualization -- I see it my way II",
author = "Eduard Gr\"{o}ller",
year = "2007",
event = "Seminar: Scientific Visualization",
location = "Dagstuhl, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/groeller-2007-visII/",
}
@talk{groeller-2006-ivt,
title = "Illustrative Visualization Techniques",
author = "Eduard Gr\"{o}ller",
year = "2007",
event = "Kolloquiumam Inst. f. Informatik",
location = "Universit\"{a}t Rostock, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/groeller-2006-ivt/",
}
@article{Rautek06Vis,
title = "Caricaturistic Visualization",
author = "Peter Rautek and Ivan Viola and Eduard Gr\"{o}ller",
year = "2006",
abstract = "Caricatures are pieces of art depicting persons or
sociological conditions in a non-veridical way. In both
cases caricatures are referring to a reference model. The
deviations from the reference model are the characteristic
features of the depicted subject. Good caricatures
exaggerate the characteristics of a subject in order to
accent them. The concept of caricaturistic visualization is
based on the caricature metaphor. The aim of caricaturistic
visualization is an illustrative depiction of
characteristics of a given dataset by exaggerating
deviations from the reference model. We present the general
concept of caricaturistic visualization as well as a variety
of examples. We investigate different visual representations
for the depiction of caricatures. Further, we present the
caricature matrix, a technique to make differences between
datasets easily identifiable.",
month = nov,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "12",
number = "5",
issn = "1077-2626",
pages = "1085--1092",
keywords = "Focus+Context Techniques, Volume Visualization, Illustrative
Visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/Rautek06Vis/",
}
@article{bruckner-2006-ICE,
title = "Illustrative Context-Preserving Exploration of Volume Data",
author = "Stefan Bruckner and S\"{o}ren Grimm and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2006",
abstract = "In volume rendering it is very difficult to simultaneously
visualize interior and exterior structures while preserving
clear shape cues. Highly transparent transfer functions
produce cluttered images with many overlapping structures,
while clipping techniques completely remove possibly
important context information. In this paper we present a
new model for volume rendering, inspired by techniques from
illustration. It provides a means of interactively
inspecting the interior of a volumetric data set in a
feature-driven way which retains context information. The
context-preserving volume rendering model uses a function of
shading intensity, gradient magnitude, distance to the eye
point, and previously accumulated opacity to selectively
reduce the opacity in less important data regions. It is
controlled by two user-specified parameters. This new method
represents an alternative to conventional clipping
techniques, shares their easy and intuitive user control,
but does not suffer from the drawback of missing context
information.",
month = nov,
issn = "1077-2626",
journal = "IEEE Transactions on Visualization and Computer Graphics",
number = "6",
volume = "12",
pages = "1559--1569",
keywords = "focus+context techniques, volume rendering, illustrative
visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/bruckner-2006-ICE/",
}
@article{vis-foa,
title = "Importance-Driven Focus of Attention",
author = "Ivan Viola and Miquel Feixas and Mateu Sbert and Eduard
Gr\"{o}ller",
year = "2006",
abstract = "This paper introduces a concept for automatic focusing on
features within a volumetric data set. The user selects a
focus, i.e., object of interest, from a set of pre-defined
features. Our system automatically determines the most
expressive view on this feature. A characteristic viewpoint
is estimated by a novel information-theoretic framework
which is based on the mutual information measure. Viewpoints
change smoothly by switching the focus from one feature to
another one. This mechanism is controlled by changes in the
importance distribution among features in the volume. The
highest importance is assigned to the feature in focus.
Apart from viewpoint selection, the focusing mechanism also
steers visual emphasis by assigning a visually more
prominent representation. To allow a clear view on features
that are normally occluded by other parts of the volume, the
focusing for example incorporates cut-away views.",
month = oct,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "12",
number = "5",
pages = "933--940",
keywords = "illustrative visualization, interacting with volumetric
datasets, optimal viewpoint estimation, focus+context
techniques, volume visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/vis-foa/",
}
@article{bruckner-2006-EVV,
title = "Exploded Views for Volume Data",
author = "Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2006",
abstract = "Exploded views are an illustration technique where an object
is partitioned into several segments. These segments are
displaced to reveal otherwise hidden detail. In this paper
we apply the concept of exploded views to volumetric data in
order to solve the general problem of occlusion. In many
cases an object of interest is occluded by other structures.
While transparency or cutaways can be used to reveal a focus
object, these techniques remove parts of the context
information. Exploded views, on the other hand, do not
suffer from this drawback. Our approach employs a
force-based model: the volume is divided into a part
configuration controlled by a number of forces and
constraints. The focus object exerts an explosion force
causing the parts to arrange according to the given
constraints. We show that this novel and flexible approach
allows for a wide variety of explosion-based visualizations
including view-dependent explosions. Furthermore, we present
a high-quality GPU-based volume ray casting algorithm for
exploded views which allows rendering and interaction at
several frames per second.",
month = sep,
journal = "IEEE Transactions on Visualization and Computer Graphics",
volume = "12",
number = "5",
issn = "1077-2626",
pages = "1077--1084",
keywords = "exploded views, illustrative visualization, volume rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/bruckner-2006-EVV/",
}
@inproceedings{heinzl-2006-rep,
title = "Reproducible Surface Extraction for Variance Comparison in
3D Computed Tomography",
author = "Christoph Heinzl and Johann Kastner and Eduard Gr\"{o}ller",
year = "2006",
month = sep,
booktitle = "Proceedings of 9th European Congress on Non-Destructive
Testing (ECNDT 2006)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/heinzl-2006-rep/",
}
@inproceedings{RAUTEK06,
title = "D²VR: High Quality Volume Rendering of Projection-based
Volumetric Data",
author = "Peter Rautek and Bal\'{a}zs Cs\'{e}bfalvi and S\"{o}ren
Grimm and Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2006",
abstract = "Volume rendering techniques are conventionally classified as
either direct or indirect methods. Indirect methods require
to transform the initial volumetric model into an
intermediate geometrical model in order to efficiently
visualize it. In contrast, direct volume rendering (DVR)
methods can directly process the volumetric data. Modern CT
scanners usually provide data as a set of samples on a
rectilinear grid, which is computed from the measured
projections by discrete tomographic reconstruction.
Therefore the rectilinear grid can already be considered as
an intermediate volume representation. In this paper we
introduce direct direct volume rendering (D²VR). D²VR does
not require a rectilinear grid, since it is based on an
immediate processing of the measured projections. Arbitrary
samples for ray casting are reconstructed from the
projections by using the Filtered Back-Projection algorithm.
Our method removes a lossy resampling step from the
classical volume rendering pipeline. It provides much higher
accuracy than traditional grid-based resampling techniques
do. Furthermore we also present a novel high-quality
gradient estimation scheme, which is also based on the
Filtered Back-Projection algorithm.",
month = may,
publisher = "IEEE CS",
booktitle = "Proceedings of Eurographics / IEEE VGTC Symposium on
Visualization",
number = "In Proceedings of EuroVis",
pages = "211--218",
keywords = "Volume Rendering, Filtered Back-Projection, Reconstruction",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/RAUTEK06/",
}
@inproceedings{Mlejnek_2005_AOEPF,
title = "Application-Oriented Extensions of Profile Flags",
author = "Matej Mlejnek and Pierre Ermes and Anna Vilanova i Bartroli
and Rob van der Rijt and Harrie van den Bosch and Eduard
Gr\"{o}ller and Frans Gerritsen",
year = "2006",
abstract = "This paper discusses two applications of probing dense
volumetric data for MR orthopedics and dynamic contrast
enhanced MRI mammography. In order not to reduce the context
information and to extract the essential part of the data,
we apply Profile Flags. A Profile Flag is a 3D glyph for
probing and annotating the volumetric data. The first
application area deals with visualization of T2 profiles for
interactive inspection of knee cartilage and detection of
lesions. In the second application, we present the usability
the Profile Flags for measuring of time-signal profiles for
a set of time-dependent MR volumes. Several extensions of
the basic Profile Flag concept are described in detail and
discussed. These extensions include selection of a set of
profiles based on spatial as well as curve differences,
automatic positioning of the Profile Flags, and adaptation
for probing of time-varying volumetric data. Additionally,
we include the evaluation of the used methods by our medical
partners.",
publisher = "IEEE CS",
booktitle = "Proceedings of Eurographics / IEEE VGTC Symposium on
Visualization",
pages = "339--346",
keywords = "applications of visualization, visualization in medicine",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/Mlejnek_2005_AOEPF/",
}
@talk{viola-2006-FoA,
title = "Focus of Attention for Volumetric Data Inspection",
author = "Ivan Viola and Miquel Feixas and Mateu Sbert and Eduard
Gr\"{o}ller",
year = "2006",
event = "Dagstuhl Seminar on Computational Aesthetics in Computer
Graphics, Visualization, and Imaging",
location = "Dagstuhl castle, Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/viola-2006-FoA/",
}
@inproceedings{heinzl_2006_RSDVCDM,
title = "Robust Surface Detection for Variance Comparison and
Dimensional Measurement",
author = "Christoph Heinzl and Roman Klingesberger and Johann Kastner
and Eduard Gr\"{o}ller",
year = "2006",
abstract = "This paper describes a robust method for creating surface
models from volume datasets with distorted density values
due to artefacts and noise. Application scenario for the
presented work is variance comparison and dimensional
measurement of homogeneous industrial components in
industrial high resolution 3D computed tomography (3D-CT).
We propose a pipeline which uses common 3D image processing
filters for pre-processing and segmentation of 3D-CT
datasets in order to create the surface model. In
particular, a pre-filtering step reduces noise and artefacts
without blurring edges in the dataset. A watershed filter is
applied on the gradient information of the smoothed data to
create a binary dataset. Finally the surface model is
constructed, using constrained elastic-surface nets to
generate a smooth but feature preserving mesh of a binary
volume. The major contribution of this paper is the
development of the specific processing pipeline for
homogeneous industrial components to handle large resolution
data of industrial CT scanners. The pipeline is crucial for
the following visual inspection of deviations.",
publisher = "IEEE CS",
booktitle = "Proceedings of Eurographics / IEEE VGTC Symposium on
Visualization",
pages = "75--82",
keywords = "Applications",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/heinzl_2006_RSDVCDM/",
}
@talk{groeller-2006-civ,
title = "Computer-supported Illustrative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2006",
event = "Kolloquium",
location = "Bonn, Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/groeller-2006-civ/",
}
@misc{groeller-2006-tvcg,
title = "IEEE Transactions on Visualization and Computer Graphics",
author = "Eduard Gr\"{o}ller and Alex Pang and C Silva and John Stasko
and Jarke van Wijk",
year = "2006",
note = "Herausgabe eines Tagungsbandes",
pages = "1360",
publisher = "IEEE",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/groeller-2006-tvcg/",
}
@misc{groeller-2006-cgf,
title = "Computer Graphics Forum",
author = "Eduard Gr\"{o}ller and L\'{a}szl\'{o} Szirmay-Kalos",
year = "2006",
note = "Guest editors of this EG 2006 proceeding (Herausgabe einer
Buchreihe)",
URL = "https://www.cg.tuwien.ac.at/research/publications/2006/groeller-2006-cgf/",
}
@inproceedings{coto-2005-MAC,
title = "MammoExplorer: An Advanced CAD Application for Breast
DCE-MRI",
author = "Ernesto Coto and S\"{o}ren Grimm and Stefan Bruckner and
Eduard Gr\"{o}ller and Armin Kanitsar and Omaira Rodriguez",
year = "2005",
abstract = "Currently X-ray mammography is the most widely used method
for early detection of breast cancer. However, the use of
Dynamic Contrast Enhanced MRI (DCE-MRI) has gained wider
attention, since it considerably improves tumor detection
and classification by analyzing the flow of contrast agent
within the breast tissue. In this paper we present
MammoExplorer, a CAD application that combines advanced
interaction, segmentation and visualization techniques to
explore Breast DCE-MRI data. Our application uses Brushing
and Linking, Two-level Volume Rendering, Importance-driven
Volume Rendering, and False Color Maps. In addition, we
present Enhancement Scatterplots, a novel graphical
representation of DCE-MRI data, novel segmentation
approaches, and a new way to explore time-varying CE-MRI
data.",
month = nov,
isbn = "3898380688",
location = "Erlangen, Germany",
editor = "G. Greiner, J. Hornegger, H. Niemann, M. Stamminger",
booktitle = "Proceedings of Vision, Modelling, and Visualization 2005",
pages = "91--98",
keywords = "CAD, Breast cancer, Contrast Enhanced MRI",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/coto-2005-MAC/",
}
@inproceedings{Zotti-2005-vis,
title = "A Sky Dome Visualisation for Identification of Astronomical
Orientations",
author = "Georg Zotti and Eduard Gr\"{o}ller",
year = "2005",
abstract = " It has long been known that ancient temples were
frequently oriented along the cardinal directions or to
certain points along the horizon where Sun or Moon rise or
set on special days of the year. In the last decades,
archaeologists have found evidence of even older building
structures buried in the soil, with doorways that also
appear to have distinct orientations. This paper presents
a novel diagram combining archaeological maps with a
folded-apart, flattened view of the whole sky, showing the
local horizon and the daily paths of sun, moon and brighter
stars. By use of this diagram, interesting groupings of
astronomical orientation directions, e.g. to certain
sunrise and sunset points could be identified, which were
evidently used to mark certain days of the year.
Orientations to a few significant stars very likely
indicated the beginning of the agricultural year in the
middle neolithic period.",
month = oct,
isbn = "0-7803-9464-X",
publisher = "IEEE",
location = "Minneapolis",
editor = "John Stasko and Matt Ward",
booktitle = "Proceedings IEEE Symposium on Information Visualization",
pages = "9--16",
keywords = "data mining, Astronomy, Archaeology",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/Zotti-2005-vis/",
}
@inproceedings{Mlejnek_2004_PF,
title = "Profile Flags: a Novel Metaphor for Probing of T2 Maps",
author = "Matej Mlejnek and Pierre Ermes and Anna Vilanova i Bartroli
and Rob van der Rijt and Harrie van den Bosch and Frans
Gerritsen and Eduard Gr\"{o}ller",
year = "2005",
abstract = "This paper describes a tool for the visualization of T2 maps
of knee cartilage. Given the anatomical scan and the T2 map
of the cartilage, we combine the information on the shape
and the quality of the cartilage in a single image. The
Profile Flag is an intuitive 3D glyph for probing and
annotating of the underlying data. It comprises a bulletin
board pin-like shape with a small flag on top of it. While
moving the glyph along the reconstructed surface of an
object, the curve data measured along the pin's needle and
in its neighborhood are shown on the flag. The application
area of the Profile Flag is manifold, enabling the
visualization of profile data of dense but inhomogeneous
objects. Furthermore, it extracts the essential part of the
data without removing or even reducing the context
information. By sticking Profile Flags into the investigated
structure, one or more significant locations can be
annotated by showing the local characteristics of the data
at that locations. In this paper we are demonstrating the
properties of the tool by visualizing T2 maps of knee
cartilage.",
month = oct,
isbn = "0780394623",
publisher = "IEEE CS",
location = "Minneapolis, USA",
editor = "C. T. Silva, E. Gr\"{o}ller, H. Rushmeier",
booktitle = "Proceedings of IEEE Visualization 2005",
pages = "599--606",
keywords = "applications of visualization, visualization in medicine",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/Mlejnek_2004_PF/",
}
@inproceedings{bruckner-2005-VIS,
title = "VolumeShop: An Interactive System for Direct Volume
Illustration",
author = "Stefan Bruckner and Eduard Gr\"{o}ller",
year = "2005",
abstract = "Illustrations play a major role in the education process.
Whether used to teach a surgical or radiologic procedure, to
illustrate normal or aberrant anatomy, or to explain the
functioning of a technical device, illustration
significantly impacts learning. Although many specimens are
readily available as volumetric data sets, particularly in
medicine, illustrations are commonly produced manually as
static images in a time-consuming process. Our goal is to
create a fully dynamic three-dimensional illustration
environment which directly operates on volume data. Single
images have the aesthetic appeal of traditional
illustrations, but can be interactively altered and
explored. In this paper we present methods to realize such a
system which combines artistic visual styles and expressive
visualization techniques. We introduce a novel concept for
direct multi-object volume visualization which allows
control of the appearance of inter-penetrating objects via
two-dimensional transfer functions. Furthermore, a unifying
approach to efficiently integrate many non-photorealistic
rendering models is presented. We discuss several
illustrative concepts which can be realized by combining
cutaways, ghosting, and selective deformation. Finally, we
also propose a simple interface to specify objects of
interest through three-dimensional volumetric painting. All
presented methods are integrated into VolumeShop, an
interactive hardware-accelerated application for direct
volume illustration.",
month = oct,
isbn = "0780394623",
location = "Minneapolis, USA",
editor = "C. T. Silva, E. Gr\"{o}ller, H. Rushmeier",
booktitle = "Proceedings of IEEE Visualization 2005",
pages = "671--678",
keywords = "focus+context techniques, illustrative visualization, volume
rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/bruckner-2005-VIS/",
}
@misc{bruckner-2005-vid,
title = "VolumeShop: Interactive Direct Volume Illustration",
author = "Stefan Bruckner and Ivan Viola and Eduard Gr\"{o}ller",
year = "2005",
abstract = "Illustrations play a major role in the education process.
Whether used to teach a surgical or radiologic procedure, to
illustrate normal or aberrant anatomy, or to explain the
functioning of a technical device, illustration
significantly impacts learning. Many specimen are readily
available as volumetric data sets, particular in medicine.
Illustrations, however, are commonly produced manually as
static images in a time-consuming process. Our goal is to
create a fully dynamic three-dimensional illustration
environment which directly operates on volume data. Single
images have the aesthetic appeal of traditional
illustrations, but can be interactively altered and
explored. We present methods to realize such a system which
combines artistic visual styles and expressive visualization
techniques. Our implementation exploits the latest
generation of GPUs and, thus, is capable of handling
commonly sized data sets at interactive frame rates. ",
month = aug,
booktitle = "ACM Siggraph 2005 DVD Proceedings (Technical Sketch)",
keywords = "focus+context techniques, volume rendering, illustrative
techniques",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/bruckner-2005-vid/",
}
@inproceedings{Artner-2005-Hig,
title = "High-Quality Volume Rendering with Resampling in the
Frequency Domain",
author = "Martin Artner and Torsten M\"{o}ller and Ivan Viola and
Eduard Gr\"{o}ller",
year = "2005",
abstract = "This work introduces a volume rendering technique that is
conceptually based on the shear-warp factorization. We
propose to perform the shear transformation entirely in the
frequency domain. Unlike the standard shear-warp algorithm,
we allow for arbitrary sampling distances along the viewing
rays, independent of the view direction. The accurate
scaling of the volume slices is achieved by using the zero
padding interpolation property. Finally, a high quality
gradient estimation scheme is presented which uses the
derivative theorem of the Fourier transform. Experimental
results have shown that the presented method outperforms
established algorithms in the quality of the produced
images. If the data is sampled above the Nyquist rate the
presented method is capable of a perfect reconstruction of
the original function.",
month = jun,
isbn = "3-905673-19-3",
location = "Leeds, United Kingdom",
booktitle = "Proceedings of EuroVis",
pages = "85--92",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/Artner-2005-Hig/",
}
@inproceedings{Viola-05-Smart,
title = "Smart Visibility in Visualization",
author = "Ivan Viola and Eduard Gr\"{o}ller",
year = "2005",
abstract = "In this paper we discuss expressive visualization techniques
that smartly uncover the most important information in order
to maximize the visual information of the underlying data.
This is achieved through dynamic change in visual
representations, through deformations, or through changing
the spatial position of parts of the data. Such techniques
originate from technical illustration and are called
cut-away views, ghosted views, and exploded views. These
illustrative techniques unveil the most important visual
information by a high level of abstraction. The change in
visual representation or spatial position is done in a way
that is easily perceivable and the overall visual harmony is
preserved.",
month = may,
isbn = "3905673274",
location = "Girona, Spain",
editor = "L. Neumann, M. Sbert, B. Gooch, W. Purgathofer",
booktitle = "Proceedings of EG Workshop on Computational Aesthetics
Computational Aesthetics in Graphics, Visualization and
Imaging",
pages = "209--216",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/Viola-05-Smart/",
}
@inproceedings{bruckner-2005-ICV,
title = "Illustrative Context-Preserving Volume Rendering",
author = "Stefan Bruckner and S\"{o}ren Grimm and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2005",
abstract = "In volume rendering it is very difficult to simultaneously
visualize interior and exterior structures while preserving
clear shape cues. Very transparent transfer functions
produce cluttered images with many overlapping structures,
while clipping techniques completely remove possibly
important context information. In this paper we present a
new model for volume rendering, inspired by techniques from
illustration that provides a means of interactively
inspecting the interior of a volumetric data set in a
feature-driven way which retains context information. The
context-preserving volume rendering model uses a function of
shading intensity, gradient magnitude, distance to the eye
point, and previously accumulated opacity to selectively
reduce the opacity in less important data regions. It is
controlled by two user-specified parameters. This new method
represents an alternative to conventional clipping
techniques, shares their easy and intuitive user control,
but does not suffer from the drawback of missing context
information. ",
month = may,
booktitle = "Proceedings of EuroVis 2005",
pages = "69--76",
keywords = "non-photorealistic techniques, focus+context techniques,
volume rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/bruckner-2005-ICV/",
}
@misc{Viola-vistutillustrativevis,
title = "IEEE Visualization Tutorial on Illustrative Visualization",
author = "Ivan Viola and Eduard Gr\"{o}ller and Katja B\"{u}hler and
Markus Hadwiger and Bernhard Preim and David Ebert and Mario
Costa Sousa and Don Stredney",
year = "2005",
abstract = "The tutorial presents state-of-the-art visualization
techniques inspired by traditional technical and medical
illustrations. Such techniques exploit the perception of the
human visual system and provide effective visual
abstractions to make the visualization clearly
understandable. Visual emphasis and abstraction has been
used for expressive presentation from prehistoric paintings
to nowadays scientific and medical illustrations. Many of
the expressive techniques used in art are adopted in
computer graphics, and are denoted as illustrative or
non-photorealistic rendering. Different stroke techniques,
or brush properties express a particular level of
abstraction. Feature emphasis or feature suppression is
achieved by combining different abstraction levels in
illustrative rendering. Challenges in visualization research
are very large data visualization as well as
multi-dimensional data visualization. To effectively convey
the most important visual information there is a significant
need for visual abstraction. For less relevant information
the dedicated image space is reduced to enhance more
prominent features. The discussed techniques in the context
of scientic visualization are based on iso-surfaces and
volume rendering. Apart from visual abstraction, i.e.,
illustrative representation, the visibility of prominent
features can be achieved by illustrative visualization
techniques such as cut-away views or ghosted views. The
structures that occlude the most prominent information are
suppressed in order to clearly see more interesting parts. A
different smart way to provide information on the data is
using exploded views or other types of deformation.
Furthermore intuitive feature classification via 3D painting
and manipulation with the classified data including label
placement is presented. Discussed non-photorealistic and
illustrative techniques from visualization and graphics are
shown from the perspective as tools for illustrators from
medicine, botany, archeology, and zoology. The limitations
of existing NPR systems for science illustration are
highlighted, and proposals for possible new directions are
made. Illustrative visualization is demonstrated via
application-specific tasks in medical visualization. An
important aspect as compared to traditional medical
illustrations is the interactivity and real-time
manipulation of the acquired patient data. This can be very
useful in anatomy education. Another application area is
surgical planning which is demonstrated with two case
studies: neck dissection and liver surgery planning.",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/Viola-vistutillustrativevis/",
}
@talk{groeller-2005-abs,
title = "Abstraction Techniques for Illustrative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2005",
event = "VMV 2005: Vision, Modeling and Visualization 2005",
location = "Erlangen, Germany",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-abs/",
}
@talk{groeller-2005-foc,
title = "Focus+Context Visualization of Features and Topological
Structures",
author = "Eduard Gr\"{o}ller",
year = "2005",
event = "Workshop Topology-Based Methods in Visualization",
location = "Budmerice, Slovakia",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-foc/",
}
@talk{groeller-2005-impo,
title = "Importance-Driven Image Generation in Medical Visualization",
author = "Eduard Gr\"{o}ller",
year = "2005",
event = "Informatikkolloquium der TU Delft",
location = "Faculty of Electrical Engineering, Mathematics and Computer
Sciences, TU Delft, Netherlands",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-impo/",
}
@talk{groeller-2005-sma,
title = "Smart Visibility in Illustrative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2005",
event = "Biomedizinisches Kolloquium der TU Eindhoven",
location = "Department of Biomedical Engineering, Technische
Universiteit Eindhoven, Netherlands",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-sma/",
}
@book{groeller-2005-volg,
title = "Volume Graphics 2005",
author = "Eduard Gr\"{o}ller and Issei Fujishiro and Klaus Mueller and
Thomas Ertl",
year = "2005",
isbn = "3905673266",
pages = "243",
publisher = "Eurographics Association",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-volg/",
}
@dataset{dataset-stagbeetle,
title = "Stag beetle",
author = "Eduard Gr\"{o}ller and Georg Glaeser and Johannes Kastner",
year = "2005",
abstract = "The stag beetle from Georg Glaeser, Vienna University of
Applied Arts, Austria, was scanned with an industrial CT by
Johannes Kastner, Wels College of Engineering, Austria, and
Meister Eduard Gr\"{o}ller, Vienna University of Technology,
Austria.",
keywords = "volume, data set",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/dataset-stagbeetle/",
}
@misc{eg-tut2005-iv,
title = "Eurographics Tutorial on Illustrative Visualization",
author = "Ivan Viola and Eduard Gr\"{o}ller and Katja B\"{u}hler and
Markus Hadwiger and Bernhard Preim and David Ebert",
year = "2005",
abstract = "The tutorial presents state-of-the-art visualization
techniques inspired by traditional technical and medical
illustrations. Such techniques exploit the perception of the
human visual system and provide effective visual
abstractions to make the visualization clearly
understandable. Visual emphasis and abstraction has been
used for expressive presentation from prehistoric paintings
to nowadays scientific and medical illustrations. Many of
the expressive techniques used in art are adopted in
computer graphics, and are denoted as illustrative or
non-photorealistic rendering. Different stroke techniques,
or brush properties express a particular level of
abstraction. Feature emphasis or feature suppression is
achieved by combining different abstraction levels in
illustrative rendering. Challenges in visualization research
are very large data visualization as well as
multi-dimensional data visualization. To effectively convey
the most important visual information there is a significant
need for visual abstraction. For less relevant information
the dedicated image space is reduced to enhance more
prominent features. The discussed techniques in the context
of scientific visualization are based on iso-surfaces and
volume rendering. Apart from visual abstraction, i.e.,
illustrative representation, the visibility of prominent
features can be achieved by illustrative visualization
techniques such as cut-away views or ghosted views. The
structures that occlude the most prominent information are
suppressed in order to clearly see more interesting parts.
Another smart way to provide information on the data is
using exploded views or other types of deformation.
Illustrative visualization is demonstrated via
application-specific tasks in medical visualization. An
important aspect as compared to traditional medical
illustrations is the interactivity and real-time
manipulation of the acquired patient data. This can be very
useful in anatomy education. Another application area is
surgical planning which is demonstrated with two case
studies: neck dissection and liver surgery planning.",
booktitle = "Tutorial Notes on Illustrative Visualization",
publisher = "Eurographics",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/eg-tut2005-iv/",
}
@article{viola-2005-imp,
title = "Importance-Driven Feature Enhancement in Volume
Visualization",
author = "Ivan Viola and Armin Kanitsar and Eduard Gr\"{o}ller",
year = "2005",
abstract = "This paper presents importance-driven feature enhancement as
a technique for the automatic generation of cut-away and
ghosted views out of volumetric data. The presented
focus+context approach removes or suppresses less important
parts of a scene to reveal more important underlying
information. however, less important parts are fully visible
in those regions, where important visual information is not
lost, i.e., more relevant features are not occluded.
Features within the volumetric data are first classified
according to a new dimension denoted as object importance.
This property determines which structures should be readily
discernible and which structures are less important. Next,
for each feature various representations (levels of
sparseness) from a dense to a sparse depiction are defined.
Levels of sparseness define a spectrum of optical properties
or rendering styles. The resulting image is generated by
ray-casting and combining the intersected features
proportional to their importance (importance compositing).
The paper includes an extended discussion on several
possible schemes for levels of sparseness specification.
Furthermore different approaches to importance compositing
are treated.",
journal = "IEEE Transactions on Visualization and Computer Graphics",
number = "4",
volume = "11",
pages = "408--418",
keywords = "non-photorealistic techniques, view-dependent visualization,
volume rendering, focus+context techniques, level-of-detail
techniques",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/viola-2005-imp/",
}
@incollection{groeller-2005-dia,
title = "Diagnostic Relevant Visualization of Vascular Structures ",
author = "Armin Kanitsar and Dominik Fleischmann and Rainer Wegenkittl
and Eduard Gr\"{o}ller",
year = "2005",
abstract = "Traditional volume visualization techniques sometimes
provide incomplete clinical information needed for
applications in medical visualization. In the area of
vascular visualization important features such as the lumen
of a diseased vessel segment may not be visible. One way to
display vascular structures for diagnostic purposes is to
generate longitudinal cross-sections in order to show their
lumen, wall, and surrounding tissue in a curved plane.
Curved planar reformation (CPR) has proven to be an
acceptable practical solution. We discuss four different
methods to generate CPR images from single vessel segments:
Projected CPR, stretched CPR, straightened CPR, and helical
CPR. Furthermore we investigate three different methods for
displaying vascular trees: Multi-path projected CPR,
multi-path stretched CPR, and untangled CPR. The principle
concept of each method is discussed and detailed information
for the realization is given. In addition the properties,
advantages and disadvantages of each method are summarized.",
booktitle = "Scientific Visualization: The Visual Extraction of Knowledge
from Data",
editor = "G.-P. Bonneau, T. Ertl, G.M. Nielson",
isbn = "3540260668",
publisher = "Springer Verlag, Berlin",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-dia/",
}
@talk{groeller-2005-imp,
title = "Importance-Driven Image Generation in Scientific
Visualization",
author = "Eduard Gr\"{o}ller",
year = "2005",
event = "Informatikkolloquium der Universit\"{a}t Bergen",
location = "Department of Informatics, University of Bergen, Norway",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-imp/",
}
@book{groeller-2005-proc,
title = "Proceedings IEEE Visualization 2005",
author = "C Silva and Eduard Gr\"{o}ller and H. Rushmeier",
year = "2005",
isbn = "0780394623",
pages = "??",
publisher = "IEEE",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-proc/",
}
@talk{groeller-2005-smar,
title = "Smart Visibility in Illustrative Visualization",
author = "Eduard Gr\"{o}ller",
year = "2005",
event = "Informatikkolloquium der Simon Fraser Universit\"{a}t",
location = "Simon Fraser University, Vancouver, Canada",
URL = "https://www.cg.tuwien.ac.at/research/publications/2005/groeller-2005-smar/",
}
@inproceedings{StrakaVis2004,
title = "The VesselGlyph: Focus & Context Visualization in
CT-Angiography",
author = "Mat\'{u}s Straka and Michal Cervenansk\'{y} and Alexandra La
Cruz and Arnold K\"{o}chl and Milo\v{s} \v{S}r\'{a}mek and
Eduard Gr\"{o}ller and Dominik Fleischmann",
year = "2004",
abstract = "Reliable and complete blood-vessel segmentation is still a
challenging problem. This is especially true in the presence
of morphologic changes resulting from atherosclerotic
diseases. In this paper we take advantage of partially
segmented data with approximately identified vessel
centerlines to comprehensively visualize the diseased
peripheral arterial tree. We introduce the VesselGlyph as an
abstract notation for novel focus & context visualization
techniques of tubular structures such as contrast-medium
enhanced arteries in CT-Angiography (CT-A). The proposed
techniques combine direct volume rendering (DVR) and curved
planar reformation (CPR) within a single image. The
VesselGlyph consists of several regions where different
rendering methods are used. Region type, the used
visualization method and region parameters depend on the
distance from the vessel centerline and on viewing
parameters as well. By selecting proper rendering techniques
for different regions, vessels are depicted in a naturally
looking and undistorted anatomic context. In this paper we
furthermore present a way how to implement the proposed
techniques in software and by means of modern 3D graphics
accelerators.",
month = oct,
publisher = "IEEE",
organization = "Commision for Scientific Visualization, Austrian",
location = "Austin, Texas",
editor = "IEEE",
booktitle = "IEEE Visualization 2004",
pages = "392--385",
keywords = "focus & Context Technique, Direct Volume Rendering, Curved
Planar Reformation, Vessel Visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/StrakaVis2004/",
}
@inproceedings{Viola-2004-ImpX2,
title = "Importance-Driven Volume Rendering",
author = "Ivan Viola and Armin Kanitsar and Eduard Gr\"{o}ller",
year = "2004",
abstract = "This paper introduces importance-driven volume rendering as
a novel technique for automatic focus and context display of
volumetric data. Our technique is a generalization of
cut-away views, which – depending on the viewpoint –
remove or suppress less important parts of a scene to reveal
more important underlying information. We automatize and
apply this idea to volumetric data. Each part of the
volumetric data is assigned an object importance which
encodes visibility priority. This property determines which
structures should be readily discernible and which
structures are less important. In those image regions, where
an object occludes more important structures it is displayed
more sparsely than in those areas where no occlusion occurs.
Thus the objects of interest are clearly visible. For each
object several representations, i.e., levels of sparseness,
are specified. The display of an individual object may
incorporate different levels of sparseness. The goal is to
emphasize important structures and to maximize the
information content in the final image. This paper also
discusses several possible schemes for level of sparseness
specification and different ways how object importance can
be composited to determine the final appearance of a
particular object.",
month = oct,
isbn = "0780387880",
publisher = "H. Rushmeier, G. Turk, J. van Wijk",
booktitle = "Proceedings of IEEE Visualization 2004",
pages = "139--145",
keywords = "view-dependent visualization, non-photorealistic techniques,
level-of-detail techniques, focus+context techniques, volume
rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/Viola-2004-ImpX2/",
}
@inproceedings{GRIMM-2004-FDMX-P,
title = "Flexible Direct Multi-Volume Rendering in Interactive Scenes",
author = "S\"{o}ren Grimm and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2004",
abstract = "In this paper we describe methods to efficiently visualize
multiple ntersecting volumetric objects. We introduce the
concept of V-Objects. V-Objects represent abstract
properties of an object connected to a volumetric data
source. We present a method to perform direct volume
rendering of a scene comprised of an arbitrary number of
possibly intersecting V-Objects. The idea of our approach is
to distinguish between regions of intersection, which need
costly multi-volume processing, and regions containing only
one V-Object, which can be processed using a highly
efficient brick-wise volume traversal scheme. Using this
method, we achieve significant performance gains for
multi-volume rendering. We show possible medical
applications, such as surgical planning, diagnosis, and
education.",
month = oct,
location = "Stanford, USA",
booktitle = "Vision, Modeling, and Visualization (VMV)",
pages = "386--379",
keywords = "multi volume rendering, medical visualization, volume
raycasting",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/GRIMM-2004-FDMX-P/",
}
@inproceedings{Mlejnek-2004-ITVAC,
title = "Interactive Thickness Visualization of Articular Cartilage",
author = "Matej Mlejnek and Anna Vilanova i Bartroli and Eduard
Gr\"{o}ller",
year = "2004",
abstract = "This paper describes a method to visualize the thickness of
curved thin objects. Given the MRI volume data of articular
cartilage, medical doctors investigate pathological changes
of the thickness. Since the tissue is very thin, it is
impossible to reliably map the thickness information by
direct volume rendering. Our idea is based on unfolding of
such structures preserving their thickness. This allows to
perform anisotropic geometrical operations (e.g., scaling
the thickness). However, flattening of a curved structure
implies a distortion of its surface. The distortion problem
is alleviated through a focus-and-context minimization
approach. Distortion is smallest close to a focal point
which can be interactively selected by the user.",
month = oct,
booktitle = "Proceedings of Visualization 2004",
pages = "521--527",
keywords = "visualization in medicine, applications of visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/Mlejnek-2004-ITVAC/",
}
@inproceedings{LaCruz2004,
title = "Non-linear Model Fitting to Parameterize Diseased Blood
Vessels",
author = "Alexandra La Cruz and Mat\'{u}s Straka and Arnold K\"{o}chl
and Milo\v{s} \v{S}r\'{a}mek and Eduard Gr\"{o}ller and
Dominik Fleischmann",
year = "2004",
abstract = "Accurate estimation of vessel parameters is a prerequisite
for automated visualization and analysis of normal and
diseased blood vessels. The objective of this research is to
estimate the dimensions of lower extremity arteries, imaged
by computed tomography (CT). The vessel is modeled using an
elliptical or cylindrical structure with specific
dimensions, orientation and blood vessel mean density. The
model separates two homogeneous regions: Its inner side
represents a region of density for vessels, and its outer
side a region for background. Taking into account the point
spread function (PSF) of a CT scanner, a function is modeled
with a Gaussian kernel, in order to smooth the vessel
boundary in the model. A new strategy for vessel parameter
estimation is presented. It stems from vessel model and
model parameter optimization by a nonlinear optimization
procedure (the Levenberg-Marquardt technique). The method
provides center location, diameter and orientation of the
vessel as well as blood and background mean density values.
The method is tested on synthetic data and real patient data
with encouraging results.",
month = oct,
isbn = "0-7803-8788-0",
publisher = "IEEE",
organization = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology",
location = "Austin, Texas",
editor = "IEEE",
booktitle = "IEEE Visualization 2004",
pages = "400--393",
keywords = "Visualiyation, Segmentation, Blood Vessel Detection",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/LaCruz2004/",
}
@article{grimm-2004-arefined,
title = "A Refined Data Addressing and Processing Scheme to
Accelerate Volume Raycasting",
author = "S\"{o}ren Grimm and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2004",
abstract = "Most volume rendering systems based on CPU volume raycasting
still suffer from inefficient CPU utilization and high
memory usage. To target these issues we present a new
technique for efficient data addressing. Furthermore, we
introduce a new processing scheme for volume raycasting
which exploits thread-level parallelism—a technology now
supported by commodity computer architectures.",
month = oct,
issn = "0097-8493",
journal = "Computers & Graphics",
number = "5",
volume = "28",
booktitle = "Computer & Graphics, Vol. 28 (5)",
isbn = "0097-8493",
pages = "719--729",
keywords = "Volume Raycasting, Bricking, Parallel Co",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/grimm-2004-arefined/",
}
@inproceedings{grimm-2004-memory,
title = "Memory Efficient Acceleration Structures and Techniques for
CPU-based Volume Raycasting of Large Data",
author = "S\"{o}ren Grimm and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2004",
abstract = "Most CPU-based volume raycasting approaches achieve high
performance by advanced memory layouts, space subdivision,
and excessive pre-computing. Such approaches typically need
an enormous amount of memory. They are limited to sizes
which do not satisfy the medical data used in daily clinical
routine. We present a new volume raycasting approach based
on image-ordered raycasting with object-ordered processing,
which is able to perform high-quality rendering of very
large medical data in real-time on commodity computers. For
large medical data such as computed tomographic (CT)
angiography run-offs (512x512x1202) we achieve rendering
times up to 2.5 fps on a commodity notebook. We achieve this
by introducing a memory efficient acceleration technique for
on-the-fly gradient estimation and a memory efficient hybrid
removal and skipping technique of transparent regions. We
employ quantized binary histograms, granular resolution
octrees, and a cell invisibility cache. These acceleration
structures require just a small extra storage of
approximately 10%. ",
month = oct,
isbn = "0-7803-8781-3",
editor = "D. Silver, T. Ertl, C. Silva",
booktitle = "Proceedings IEEE/SIGGRAPH Symposium on Volume Visualization
and Graphics",
pages = "1--8",
keywords = "Three-Dimensional Graphics and Realism,",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/grimm-2004-memory/",
}
@article{grimm-2004-volume,
title = "VOTS: VOlume doTS as a Point-Based Representation of
Volumetric Data",
author = "S\"{o}ren Grimm and Stefan Bruckner and Armin Kanitsar and
Eduard Gr\"{o}ller",
year = "2004",
abstract = "We present Volume dots (Vots), a new primitive for
volumetric data modelling, processing, and rendering. Vots
are a point-based representation of volumetric data. An
individual Vot is specified by the coefficients of a Taylor
series expansion, i.e. the function value and higher order
derivatives at a specific point. A Vot does not only
represent a single sample point, it represents the
underlying function within a region. With the Vots
representation we have a more intuitive and high-level
description of the volume data. This allows direct
analytical examination and manipulation of volumetric
datasets. Vots enable the representation of the underlying
scalar function with specified precision. User-centric
importance sampling is also possible, i.e., unimportant
volume parts are still present but represented with just
very few Vots. As proof of concept, we show Maximum
Intensity Projection based on Vots.",
month = sep,
journal = "Computer Graphics Forum",
volume = "23",
number = "3",
issn = "0167-7055",
pages = "668--661",
keywords = "Graphics Data Structures and Data Types",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/grimm-2004-volume/",
}
@inproceedings{Viola-2004-GPU,
title = "GPU-based Frequency Domain Volume Rendering",
author = "Ivan Viola and Armin Kanitsar and Eduard Gr\"{o}ller",
year = "2004",
abstract = "Frequency domain volume rendering (FVR) is a volume
rendering technique with lower computational complexity as
compared to other techniques. In this paper the FVR
algorithm is accelerated by factor of 17 by mapping the
rendering stage to the GPU. The overall hardware-accelerated
pipeline is discussed and the changes according to previous
work are pointed out. The three-dimensional transformation
into frequency domain is done in a pre-processing step. The
rendering step is computed completely on the GPU. First the
projection slice is extracted. Four different interpolation
schemes are used for resampling the slice from the data
represented by a 3D texture. The extracted slice is
transformed back into the spatial domain using the inverse
Fast Fourier or Fast Hartley Transform. The rendering stage
is implemented through shader programs running on
programmable graphics hardware achieving highly interactive
framerates.",
month = apr,
isbn = "80-223-1730-6",
note = "second-best paper award!",
booktitle = "Proceedings of SCCG 2004",
pages = "49--58",
keywords = "Fourier Transform, Fourier Volume Rendering, Hardware
Acceleration",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/Viola-2004-GPU/",
}
@inproceedings{alacruzECR2004,
title = "Accuracy of Automated Centerline Approximation Algorithms
for Lower Extremity Vessels in CTA Phantom",
author = "Alexandra La Cruz and Mat\'{u}s Straka and Arnold K\"{o}chl
and Milo\v{s} \v{S}r\'{a}mek and Eduard Gr\"{o}ller and
Dominik Fleischmann",
year = "2004",
abstract = "Purpose: The accurate determination of the central vessel
axis is a prerequisite for automated visualization (curved
planar reformation) and quantitation. The purpose of this
work was to assess the accuracy of different algorithms for
automated centerline detection in a phantom simulating the
peripheral arterial tree. Methods and Material: Six
algorithms were used to determine the centerline of a
synthetic peripheral arterial vessel (aorto-to-pedal
arteries, diameter 18-0.6mm) dataset (256x256x600, voxel
size 0.5x0.5x0.5mm). They are ray-casting/thresholding
(RCT), ray-casting/maximum gradient (RCMG), block matching
(BM), fitting to ellipse (FE), center of gravity (CoG), and
Randomized Hough transform (RHT). Gaussian noise whith a
sigma: 0, 5 and 10 was used to observe the accuracy of the
method under noise influence The accuracy of automatic
centerline determination was quantified by measuring the
error-distance between the derived centerlines, and the
known centerline course of the synthetic dataset. Results:
BM demonstrated unacceptable performance in large vessels
(>5mm) when the shift used was less than 3 voxels. RCMG
demonstrated a greater error (mean of the error 4.73mm) in
large diameter (>15mm) vessels than in small diameter
(<15mm) vessels (mean of the error 0.64mm). Because RHT and
FE use Canny edge detector preprocessing, both are sensitive
to noise. CoG and RCT keep the mean of the error-distance
significantly smaller (0.7mm and 0.9mm respectively) than
all other algorithms. Conclusion: CoG and RCT algorithms
provide the most efficient centerline approximation over a
wide range of vessel diameters. ",
month = mar,
organization = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology",
location = "Vienna, Austria",
booktitle = "European Congres of Radiology",
keywords = "Medical Visualization, Vessel Segmentation, Centerline
Detection",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/alacruzECR2004/",
}
@article{knapp-2004-semi,
title = "Semi-Automatic Topology Independent Contour-Based 2 1/2 D
Segmentation Using Live-Wire",
author = "Michael Knapp and Armin Kanitsar and Eduard Gr\"{o}ller",
year = "2004",
abstract = "In general three-dimensional segmentation algorithms assume
objects to have connected homogeneous regions. However in
some cases objects are defined by a fuzzy boundary surface
and consist of an inhomogeneous internal structure. In the
following a new three-dimensional segmentation technique
exploiting the contour detection capabilities of live-wire
is proposed. The algorithm consists of two basic steps.
First contours are outlined by the user on a small number of
planar cross-sections through the object using live-wire.
Second the traced contours are used for reconstructing the
object surface automatically in each slice using live-wire
again. This user-friendly segmentation algorithm is
independent from object topology as the topology is
implicitly defined during the reconstruction process.",
month = feb,
journal = "Journal of WSCG",
volume = "12",
number = "2",
issn = "1213-6972",
booktitle = "Journal of WSCG, Vol. 12, Number 2",
isbn = "1213-6972",
pages = "229--236",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/knapp-2004-semi/",
}
@talk{groeller-2004-imp,
title = "Importance-Driven Image Generation in Scientific
Visualization",
author = "Eduard Gr\"{o}ller",
year = "2004",
event = "Informatics Colloquium",
location = "Brno",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/groeller-2004-imp/",
}
@talk{groeller-2004-efficient,
title = "Efficient Volume Visualization of Large Medical Datasets",
author = "Eduard Gr\"{o}ller",
year = "2004",
event = "VRVis Forum",
location = "Wien, Austria",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/groeller-2004-efficient/",
}
@talk{groeller-2004-sci,
title = "Scientific Visualization Techniques and Applications",
author = "Eduard Gr\"{o}ller",
year = "2004",
event = "Cyber College/ CSAM Colloquium Series",
location = "Little Rock",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/groeller-2004-sci/",
}
@inproceedings{Bruckner-2003-The,
title = "The Inverse Warp: Non-Invasive Integration of Shear-Warp
Volume Rendering into Polygon Rendering Pipelines",
author = "Stefan Bruckner and Dieter Schmalstieg and Helwig Hauser and
Eduard Gr\"{o}ller",
year = "2003",
abstract = "In this paper, a simple and efficient solution for combining
shear-warp volume rendering and the hardware graphics
pipeline is presented. The approach applies an inverse warp
transformation to the Z-Buffer, containing the rendered
geometry. This information is used for combining geometry
and volume data during compositing. We present applications
of this concept which include hybrid volume rendering, i.e.,
concurrent rendering of polygonal objects and volume data,
and volume clipping on convex clipping regions. Furthermore,
it can be used to efficiently define regions with different
rendering modes and transfer functions for focus+context
volume rendering. Empirical results show that the approach
has very low impact on performance.",
month = nov,
isbn = "3898380483",
publisher = "infix",
editor = "T. Ertl, B. Girod, G. Greiner, H. Niemann, H.-P. Seidel, E.
Steinbach, R. Westermann",
booktitle = "Workshop on Vision, Modeling and Visualization",
pages = "529--536",
keywords = "focus+context techniques, clipping, hybrid volume rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Bruckner-2003-The/",
}
@inproceedings{Straka-2003-Bon,
title = "Bone Segmentation in CT-Angiography Data Using a
Probabilistic Atlas",
author = "Mat\'{u}s Straka and Alexandra La Cruz and Leonid Dimitrov
and Milo\v{s} \v{S}r\'{a}mek and Dominik Fleischmann and
Eduard Gr\"{o}ller",
year = "2003",
abstract = "Automatic segmentation of bony structures in CT angiography
datasets is an essential pre-processing step necessary for
most visualization and analysis tasks. Since traditional
density and gradient operators fail in non-trivial cases (or
at last require extensive operator work), we propose a new
method for segmentation of CTA data based on a probabilistic
atlas. Sorting densities and masks of previously manually
segmented tissues to the atlas can constitute a statistical
information base for latter accurate segmentation. In order
to eliminate dimensional and anatomic variability of the
atlas input datasets, these have to be spatially normalized
(registered) first by applying a non-rigid transformation.
After this transformation, densities and tissue masks are
statistically processed (e.g. averaged) within the atlas.
Records in the atlas can be later evaluated for estimating
the probability of bone tissue in a voxel of an unsegmented
dataset.",
month = nov,
publisher = "VMV",
booktitle = "Vision, Modeling and Visualization",
pages = "505--512",
keywords = "Knowledge Based Segmentation, CT Angiography, Probabilistic
Atlas, Thin-Plate Spline, Distance Fields, Histogram
Classficication",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Straka-2003-Bon/",
}
@inproceedings{Viola-2003-Har,
title = "Hardware-Based Nonlinear Filtering and Segmentation using
High-Level Shading Languages.",
author = "Ivan Viola and Armin Kanitsar and Eduard Gr\"{o}ller",
year = "2003",
abstract = "Non-linear filtering is an important task for volume
analysis. This paper presents hardware-based implementations
of various nonlinear filters for volume smoothing with edge
preservation. The Cg high-level shading language is used in
combination with latest PC consumer graphics hardware.
Filtering is divided into pervertex and per-fragment stages.
In both stages we propose techniques to increase the
filtering performance. The vertex program pre-computes
texture coordinates in order to address all contributing
input samples of the operator mask. Thus additional
computations are avoided in the fragment program. The
presented fragment programs preserve cache coherence,
exploit 4D vector arithmetic, and internal fixed point
arithmetic to increase performance. We show the
applicability of non-linear filters as part of a GPU-based
segmentation pipeline. The resulting binary mask is
compressed and decompressed in the graphics memory
on-the-fly.",
month = oct,
isbn = "0780381203",
publisher = "IEEE",
editor = "G. Turk, J. van Wijk, K. Moorhead",
booktitle = "Proceedings of IEEE Visualization 2003",
pages = "309--316",
keywords = "Hardware Acceleration, Segmentation, Non-linear Filtering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Viola-2003-Har/",
}
@inproceedings{Mattausch-2003-Str,
title = "Strategies for Interactive Exploration of 3D Flow Using
Evenly-Spaced Illuminated Streamlines",
author = "Oliver Mattausch and Thomas Theu{\ss}l and Helwig Hauser and
Eduard Gr\"{o}ller",
year = "2003",
month = apr,
isbn = "158113861x",
publisher = "SCCG",
editor = "K. Joy",
booktitle = "Proceedings of Spring Conference on Computer Graphics",
pages = "213 --222",
keywords = "flow visualization, streamlines, focus and context",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Mattausch-2003-Str/",
}
@inproceedings{Straka-2003-Apr,
title = "A probabilistic atlas of the lower extremity arterial tree
for perpheral CT angiography",
author = "Mat\'{u}s Straka and Milo\v{s} \v{S}r\'{a}mek and Alexandra
La Cruz and Arnold K\"{o}chl and Eduard Gr\"{o}ller and
Dominik Fleischmann",
year = "2003",
publisher = "ECR",
booktitle = "European Congress of Radiology",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Straka-2003-Apr/",
}
@inproceedings{Hadwiger-2003-MIP,
title = "MIP-Mapping With Procedural and Texture-Based Magnification",
author = "Markus Hadwiger and Thomas Theu{\ss}l and Helwig Hauser and
Eduard Gr\"{o}ller",
year = "2003",
publisher = "ACM",
booktitle = "Sketches & Applications",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Hadwiger-2003-MIP/",
}
@talk{groeller-2003-med,
title = "Medizinische Visualisierung: CT Angiographie und weitere
Beispiele",
author = "Eduard Gr\"{o}ller",
year = "2003",
location = "Universit\"{a}t T\"{u}bingen, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/groeller-2003-med/",
}
@inproceedings{Kanitsar-2003-Adva,
title = "Advanced Curved Planar Reformation: Flattering of Vascular
Structures",
author = "Armin Kanitsar and Rainer Wegenkittl and Dominik Fleischmann
and Eduard Gr\"{o}ller",
year = "2003",
isbn = "0780381203",
publisher = "IEEE",
editor = "G. Turk, J. van Wijk, K. Moorhead",
booktitle = "Proceedings of IEEE Visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Kanitsar-2003-Adva/",
}
@talk{groeller-2003-vol,
title = "Volumetric Feature Extraction in Medical Visualization",
author = "Eduard Gr\"{o}ller",
year = "2003",
event = "Stanford University School of Medicine Medicine,
Radiological Sciences Laboratory,",
location = "Stanford, USA",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/groeller-2003-vol/",
}
@inproceedings{Kanitsar-2003-Dem,
title = "Demonstration of different segmentation and visualization
techniques by means of a complex real world object
exemplified by a Christmas tree",
author = "Armin Kanitsar and Dominik Fleischmann and Thomas Theu{\ss}l
and Lukas Mroz and Milo\v{s} \v{S}r\'{a}mek and Eduard
Gr\"{o}ller",
year = "2003",
publisher = "ECR",
booktitle = "European Congress of Radiology",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Kanitsar-2003-Dem/",
}
@incollection{Bartroli-2003-Geo,
title = "Geometric Modeling for Virtual Colon Unfolding",
author = "Anna Vilanova i Bartroli and Eduard Gr\"{o}ller",
year = "2003",
booktitle = "?",
editor = "G. Brunnett, B. Hamann, H. M�ller, L. Linsen",
isbn = "ISBN: 3-540-40116-4",
publisher = "Springer",
pages = "?",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Bartroli-2003-Geo/",
}
@inproceedings{Straka-2003-3DW,
title = "3D Watershed Transform Combined with a Probabilistic Atlas
for Medical Image Segmentation",
author = "Mat\'{u}s Straka and Alexandra La Cruz and Arnold K\"{o}chl
and Milo\v{s} \v{S}r\'{a}mek and Eduard Gr\"{o}ller and
Dominik Fleischmann",
year = "2003",
abstract = " Recent advances in medical imaging technology using
multiple detector-row computed tomography (CT) provide
volumetric datasets with unprecedented spatial resolution.
This has allowed for CT to evolve into an excellent
non-invasive vascular imaging technology, commonly referred
to as CT-angiography. Visualization of vascular structures
from CT datasets is demanding, however, and identification
of anatomic objects in CT-datasets is highly desirable.
Density and/or gradient operators have been used most
commonly to classify CT data. In CT angiography, simple
density/gradient operators do not allow precise and reliable
classification of tissues due to the fact that different
tissues (e.g. bones and vessels) possess the same density
range and may lie in close spatial vicinity. We hypothesize,
that anatomic classification can be achieved more
accurately, if both spatial location and density properties
of volume data are taken into account. We present a
combination of two well-known methods for volume data
processing to obtain accurate tissue classification. 3D
watershed transform is used to partition the volume data in
morphologically consistent blocks and a probabilistic
anatomic atlas is used to distinguish between different
kinds of tissues based on their density.",
booktitle = "MIT 2003",
journal = "Journal of Medical Informatics & Technologies",
keywords = "Thin-Plate-Spline, Knowledge Based Segmentation Probabilist,
CT Angiography, Histogram Classification",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Straka-2003-3DW/",
}
@inproceedings{Theussl-2003-Rec,
title = "Reconstruction issues in volume visualization",
author = "Thomas Theu{\ss}l and J. M\"{o}ller and Ji\v{r}\'{i}
Hlad\r{u}vka and Eduard Gr\"{o}ller",
year = "2003",
isbn = "1402072597",
publisher = "Kluwer Academic Publishers",
editor = "F. Post, G. Nielson, G.P. Bonneau",
booktitle = "Data Visualization: The state of the art",
pages = "109--124",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Theussl-2003-Rec/",
}
@incollection{Hauser-2003-Acc,
title = "Access to surface properties up to order two for
visualization algorithms",
author = "Helwig Hauser and Thomas Theu{\ss}l and Eduard Gr\"{o}ller",
year = "2003",
booktitle = "?",
editor = "G. Brunnett, B. Hamann, H. M�ller, L. Linsen",
isbn = "16123786",
publisher = "Springer",
pages = "?",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Hauser-2003-Acc/",
}
@talk{groeller-2003-fea,
title = "Feature Extraction in Medical Visualization",
author = "Eduard Gr\"{o}ller",
year = "2003",
event = "Seminar 03231, Scientific Visualization: Extracting
Information and Knowledge from Scientific Data Sets,",
location = "Dagstuhl, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/groeller-2003-fea/",
}
@talk{groeller-2003-scie,
title = "Scientific Visualization in Medicine (or a Christmas-Tree in
Heavan)",
author = "Eduard Gr\"{o}ller",
year = "2003",
event = "Central European Seminar on Computer Graphics",
location = "Budmerice, Slovakia",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/groeller-2003-scie/",
}
@inproceedings{Kanitsar-2003-CTa,
title = "CT angiography: Multi-path curved planar reformation of the
peripheral arterial tree",
author = "Armin Kanitsar and Dominik Fleischmann and Rainer Wegenkittl
and Petr Felkel and Eduard Gr\"{o}ller",
year = "2003",
publisher = "ECR",
booktitle = "European Congress of Radiology",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Kanitsar-2003-CTa/",
}
@inproceedings{Koechl-2003-Com,
title = "Comprehensive assessment of peripheral arteries using
multi-path curved planar reformation of CTA datasets",
author = "Arnold K\"{o}chl and Armin Kanitsar and F. Lomoschitz and
Eduard Gr\"{o}ller and Dominik Fleischmann",
year = "2003",
publisher = "ECR",
booktitle = "European Congress of Radiology",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Koechl-2003-Com/",
}
@inproceedings{Bartroli-2003-Non,
title = "Nonlinear Virtual Colon Unfolding",
author = "Anna Vilanova i Bartroli and Rainer Wegenkittl and Eduard
Gr\"{o}ller and E. Sorantin",
year = "2003",
publisher = "ECR",
booktitle = "European Congress of Radiology",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Bartroli-2003-Non/",
}
@inproceedings{Neumann-2002-Fea,
title = "Feature-Preserving Volume Filtering",
author = "L\'{a}szl\'{o} Neumann and Bal\'{a}zs Cs\'{e}bfalvi and Ivan
Viola and Matej Mlejnek and Eduard Gr\"{o}ller",
year = "2002",
abstract = "In this paper a feature-preserving volume filtering method
is presented. The basic idea is to minimize a
three-component global error function penalizing the density
and gradient errors and the curvature of the unknown
filtered function. The optimization problem leads to a large
linear equation system defined by a sparse coefficient
matrix. We will show that such an equation system can be
efficiently solved in frequency domain using fast Fourier
transformation (FFT). For the sake of clarity, first we
illustrate our method on a 2D example which is a dedithering
problem. Afterwards the 3D extension is discussed in detail
since we propose our method mainly for volume filtering. We
will show that the 3D version can be efficiently used for
elimination of the typical staircase artifacts of direct
volume rendering without losing fine details. Unlike local
filtering techniques, our novel approach ensures a global
smoothing effect. Previous global 3D methods are restricted
to binary volumes or segmented iso-surfaces and they are
based on area minimization of one single reconstructed
surface. In contrast, our method is a general
volume-filtering technique, implicitly smoothing all the
iso-surfaces at the same time. Although the strength of the
presented algorithm is demonstrated on a specific 2D and a
specific 3D application, it is considered as a general
mathematical tool for processing images and volumes.",
month = may,
publisher = "ACM",
booktitle = "Data Visualization 2002",
pages = "105--114",
keywords = "antialiasing, noise filtering, derivative and gradient
estimation, feature-preserving smoothing, direct volume
rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Neumann-2002-Fea/",
}
@inproceedings{Matkovic-2002-Pro,
title = "Process Visualization with Levels of Detail",
author = "Kresimir Matkovic and Helwig Hauser and Reinhard Sainitzer
and Eduard Gr\"{o}ller",
year = "2002",
publisher = "IEEE Computer Society Press",
booktitle = "IEEE Symposium on Information Visualization 2002",
pages = "67--70",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Matkovic-2002-Pro/",
}
@article{hladuvka-2002-exploiting,
title = "Exploiting the Hessian matrix for content -based retrieval
of volume-data features",
author = "Ji\v{r}\'{i} Hlad\r{u}vka and Eduard Gr\"{o}ller",
year = "2002",
journal = "Visual Computer",
number = "18",
pages = "207--217",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/hladuvka-2002-exploiting/",
}
@inproceedings{Groeller-2002-Ins,
title = "Insight into Data through Visualization",
author = "Eduard Gr\"{o}ller",
year = "2002",
publisher = "Springer",
booktitle = "Graph Drawing 2002",
pages = "352--366",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Groeller-2002-Ins/",
}
@talk{groeller-2002-wiss,
title = "Wissenschaftliche Visualisierung in der Medizin",
author = "Eduard Gr\"{o}ller",
year = "2002",
location = "Universit\"{a}t Bonn, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/groeller-2002-wiss/",
}
@inproceedings{Csebfalvi-2002-Smo,
title = "Smooth Shape-Based Interpolation using the Conjugate
Gradient Method",
author = "Bal\'{a}zs Cs\'{e}bfalvi and L\'{a}szl\'{o} Neumann and
Armin Kanitsar and Eduard Gr\"{o}ller",
year = "2002",
publisher = "Akademische Verlagsgesellschaft Aka GmbH, Berlin",
booktitle = "Vision, Modeling, and Visualization 2002",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Csebfalvi-2002-Smo/",
}
@article{Wagner-2002-End,
title = "Endo View: A Phantom Study of a Tracked Virtual Bronchoscopy",
author = "Daniel Wagner and Rainer Wegenkittl and Eduard Gr\"{o}ller",
year = "2002",
journal = "Journal of WSCG",
volume = "10",
number = "2",
pages = "493--498",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Wagner-2002-End/",
}
@article{Hladuvka-2002-Exp,
title = "Exploiting the Hessian matrix for content-based retrieval of
volume-data features",
author = "Ji\v{r}\'{i} Hlad\r{u}vka and Eduard Gr\"{o}ller",
year = "2002",
journal = "Visual Computer",
number = "4",
volume = "18",
pages = "207--217",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Hladuvka-2002-Exp/",
}
@article{Hladuvka-2002-Sma,
title = "Smallest second-order derivatives for efficient volume-data
representation",
author = "Ji\v{r}\'{i} Hlad\r{u}vka and Eduard Gr\"{o}ller",
year = "2002",
journal = "Computers & Graphics",
number = "2",
volume = "26",
pages = "229--238",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Hladuvka-2002-Sma/",
}
@talk{groeller-2002-anw,
title = "Anwendungsbeispiele medizinischer Visualisierung",
author = "Eduard Gr\"{o}ller",
year = "2002",
event = "Fachbereich Informatik",
location = "Univ. Kaiserslautern, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/groeller-2002-anw/",
}
@talk{groeller-2002-med,
title = "Medical Visualization: CT Angiography and other Examples",
author = "Eduard Gr\"{o}ller",
year = "2002",
event = "Philipps Medical Systems",
location = "Eindhoven, Netherlands",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/groeller-2002-med/",
}
@inproceedings{Kanitsar-2002-CPR,
title = "CPR- Curved Planar Reformation",
author = "Armin Kanitsar and Dominik Fleischmann and Rainer Wegenkittl
and Petr Felkel and Eduard Gr\"{o}ller",
year = "2002",
publisher = "IEEE Computer Society Press",
booktitle = "IEEE Visualization 2002",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Kanitsar-2002-CPR/",
}
@article{Bartroli-2002-Pro,
title = "Projected Slabs: Approximation of Perspective projection and
Error Analysis",
author = "Anna Vilanova i Bartroli and Rainer Wegenkittl and Eduard
Gr\"{o}ller",
year = "2002",
journal = "Journal of Visualization and Computer Animation",
number = "5",
volume = "12",
pages = "253--262",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Bartroli-2002-Pro/",
}
@misc{Vilanova-2001-Non,
title = "Nonlinear Virtual Colon Unfolding",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Andreas
K\"{o}nig and Anna Vilanova i Bartroli",
year = "2001",
note = "Proceedings of IEEE
Visualization 2001, October 2001, San Diego, USA, pp.
91-98",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Vilanova-2001-Non/",
}
@misc{Vilanova-2001-Vir,
title = "Virtual Colon Flattening",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Andreas
K\"{o}nig and E. Sorantin and Anna Vilanova i Bartroli",
year = "2001",
note = "Proceedings of VisSym'01, Joint Eurographics - IEEE TCVG
Symposium on Visualization, May 28 - May 30, pages 127-136
2001, Ascona, Switzerland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Vilanova-2001-Vir/",
}
@misc{Hladuvka-2001-Dir,
title = "Direction-Driven Shape-Based Interpolation of Volume Data",
author = "Eduard Gr\"{o}ller and Ji\v{r}\'{i} Hlad\r{u}vka",
year = "2001",
note = "Proceedings of Vision,
Modeling and Visualization 2001, November 2001,
Stuttgart, Germany, pages 113-120,521",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Hladuvka-2001-Dir/",
}
@misc{Hladuvka-2001-Sal,
title = "Salient Representation of Volume Data",
author = "Eduard Gr\"{o}ller and Ji\v{r}\'{i} Hlad\r{u}vka",
year = "2001",
note = "Proceedings of VisSym'01, Joint Eurographics - IEEE TCVG
Symposium on Visualization, May 28 - May 30, 2001, Ascona,
Switzerland, pages 203-211,351",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Hladuvka-2001-Sal/",
}
@misc{Kanitsar-2001-Aut,
title = "Automated Vessel Detection at Lower Extremity Multislice CTA",
author = "D. Sandner and Armin Kanitsar and Dominik Fleischmann and
Rainer Wegenkittl and Eduard Gr\"{o}ller and Petr Felkel",
year = "2001",
note = "European Congress of Radiology 2001 (ECR 2001), March 2-6
2001, Vienna",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Kanitsar-2001-Aut/",
}
@misc{Kanitsar-2001-Pos,
title = "Postprocessing and Visualization of Peripheral CTA Data in
Clinical Environments",
author = "D. Sandner and Armin Kanitsar and Dominik Fleischmann and
Rainer Wegenkittl and Eduard Gr\"{o}ller and Petr Felkel",
year = "2001",
note = "Central European Seminar on Computer Graphics (CESCG'2001),
Budmerice, Slovakia, April 23-25, 2001",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Kanitsar-2001-Pos/",
}
@misc{Koenig-2001-Mas,
title = "Mastering Transfer Function Specification by Using VolumePro
Technology",
author = "Eduard Gr\"{o}ller and Andreas K\"{o}nig",
year = "2001",
note = "Proceedings of the 17th Spring Conference on Computer
Graphics (SCCG'01), Budmerice, Slovakia, IEEE, April 2001,
pp. 279-286, ISBN 0-7695-1215-1",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Koenig-2001-Mas/",
}
@misc{Csebfalvi-2001-Fas,
title = "Fast Visualization of Object Contours by Non-Photorealistic
Volume Rendering",
author = "Eduard Gr\"{o}ller and Helwig Hauser and Lukas Mroz and
Andreas K\"{o}nig and Bal\'{a}zs Cs\'{e}bfalvi",
year = "2001",
note = "Proceedings of Eurographics 2001, 4-7 September 2001,
Manchester, United Kingdom",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Csebfalvi-2001-Fas/",
}
@misc{a-2001-ah,
title = "Hardware
Accelerated High-Quality Reconstruction of Volumetric Data
on PC Consumer Hardware",
author = "Eduard Gr\"{o}ller and Thomas Theu{\ss}l and Helwig Hauser
and Markus Hadwiger",
year = "2001",
note = "Proceedings of Vision,
Modeling, and Visualization 2001, November 2001,
Stuttgart, Germany, pp. 105-112",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/a-2001-ah/",
}
@misc{a-2001-Rec,
title = "Reconstruction Issues in Volume Visualization",
author = "Eduard Gr\"{o}ller and Thomas Theu{\ss}l and Ji\v{r}\'{i}
Hlad\r{u}vka and Torsten M\"{o}ller",
year = "2001",
note = "Proceedings of Dagstuhl Seminar on Scientific Visualization,
2000",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/a-2001-Rec/",
}
@misc{Vilanova-2001-Per,
title = "Perspective Projection through Parallel Projected Slabs for
Virtual Endoscopy",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Andreas
K\"{o}nig and Anna Vilanova i Bartroli",
year = "2001",
note = "Proceedings of the 17th Spring Conference on Computer
Graphics (SCCG'01), Budmerice, Slovakia, IEEE, April
25th-28th, 2001, pp. 287-295, ISBN 0-7695-1215-1",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Vilanova-2001-Per/",
}
@misc{Hladuvka-2001-Exp,
title = "Exploiting Eigenvalues of the Hessian Matrix for Volume
Decimation",
author = "Eduard Gr\"{o}ller and Ji\v{r}\'{i} Hlad\r{u}vka and Andreas
K\"{o}nig",
year = "2001",
note = "In conference proceedings of the 9th International
Conference in Central Europe on Computer Graphics,
Visualization and Computer Vision 2001, WSCG'2001,
University of West Bohemia, Pilsen, Czech Republic, Vaclav
Skala (ed.), February 2001, vol. 1, pp. 124-129",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Hladuvka-2001-Exp/",
}
@misc{Kanitsar-2001-Per,
title = "Peripheral Vessel Investigation for Routine Clinical Use",
author = "D. Sandner and Armin Kanitsar and Dominik Fleischmann and
Rainer Wegenkittl and Eduard Gr\"{o}ller and Petr Felkel",
year = "2001",
note = "Proceedings of IEEE
Visualization 2001, October 2001, San Diego, USA, pp.
91-98
",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Kanitsar-2001-Per/",
}
@misc{Csebfalvi-2001-Int,
title = "Interactive Volume Rendering based on a "Bubble Model"",
author = "Eduard Gr\"{o}ller and Bal\'{a}zs Cs\'{e}bfalvi",
year = "2001",
note = "Proceedings of Graphics Interface 2001, June 7th-9th, 2001,
Ottawa, Ontario, Canada",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Csebfalvi-2001-Int/",
}
@misc{a-2001-ahr,
title = "Optimal
Regular Volume Sampling",
author = "Eduard Gr\"{o}ller and Thomas Theu{\ss}l and Torsten
M\"{o}ller",
year = "2001",
note = "Proceedings of IEEE
Visualization 2001, October 2001, San Diego, USA, pp.
91-98",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/a-2001-ahr/",
}
@misc{Mroz-2000-Mas,
title = "Mastering Interactive Surface Rendering for Java-Based
Diagnostic Applications",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Lukas Mroz",
year = "2000",
note = "IEEE Visualization 2000 Proceedings, 2000, pp. 437-440",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Mroz-2000-Mas/",
}
@misc{Neumann-2000-Gra,
title = "Gradient Estimation in Volume Data using 4D Linear
Regression",
author = "Eduard Gr\"{o}ller and L\'{a}szl\'{o} Neumann and Andreas
K\"{o}nig and Bal\'{a}zs Cs\'{e}bfalvi",
year = "2000",
note = "Computer Graphics Forum 19(3), 2000, pp. C-351 - C-357",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Neumann-2000-Gra/",
}
@misc{Hauser-2000-Two,
title = "Two-level volume rendereing - fusing MIP and DVR",
author = "Eduard Gr\"{o}ller and Helwig Hauser and Lukas Mroz and
Gian-Italo Bischi",
year = "2000",
note = "IEEE Visualization 2000 Proceedings, 2000, pp. 211-218.
Revised version will be published in IEEE Transactions on
Computer Graphics and Visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Hauser-2000-Two/",
}
@misc{Groeller-2000-Vis,
title = "Visualization of Analytically Defined Dynamical Systems",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Helwig
L\"{o}ffelmann",
year = "2000",
note = "In H. Hagen, G.M. Nielson, F. Post (eds.), Proceedings
Dagstuhl'97, Scientific Visualization, IEEE Computer
Society, 2000, pp. 71-82",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Groeller-2000-Vis/",
}
@misc{Knoll-2000-AJi,
title = "A Jini Service to Reconstruct Tomographic Data",
author = "P. Knoll and K. H\"{o}ll and S. Mirzai and K. Koriska and H.
K\"{o}hn and Eduard Gr\"{o}ller",
year = "2000",
note = "IEEE Transactions on Medical Imaging, 19(12), 2000",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Knoll-2000-AJi/",
}
@misc{Koenig-2000-AlV,
title = "AlVis - an Aluminium-Foam Visualization and Investigation
Tool",
author = "Brigitte Kriszt and Eduard Gr\"{o}ller and Andreas K\"{o}nig
and Helmut Doleisch and Andreas Kottar",
year = "2000",
note = "In W. deLeeuw R. vanLiere, (eds.), Data Visualization 2000,
Springer Wien, pp. 229-238",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Koenig-2000-AlV/",
}
@misc{Berger-2000-Col,
title = "Color-Table Animation of Fast Oriented Line Integral
Convolution for Vector Field Visualization",
author = "S. Berger and Eduard Gr\"{o}ller",
year = "2000",
note = "N. M. Thalmann, V. Skala (eds.), Proceedings of WSCG'2000,
the 8-th International Conference in Central Europe on
Computer Graphics, Visualization and Interactive Digital
Media'2000, February 7-10, 2000, Plzen, Czech Republic, Vol.
1, pp. 4-11",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Berger-2000-Col/",
}
@misc{Csebfalvi-2000-Fas,
title = "Fast Surface Rendering of Volumetric Data",
author = "Eduard Gr\"{o}ller and Andreas K\"{o}nig and Bal\'{a}zs
Cs\'{e}bfalvi",
year = "2000",
note = "N.M.Thalmann, V. Skala (eds.), Proceedings of WSCG'2000, the
8-th International Conference in Central Europe on Computer
Graphics, Visualization and Interactive Digital Media'2000,
February 7-11, 2000, Plzen, Czech Republic, Short
communication papers, pp. 9-16",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Csebfalvi-2000-Fas/",
}
@misc{Vilanova-2000-Cyl,
title = "Cylindrical Approximation of Tubular Organs for Virtual
Endoscopy",
author = "Eduard Gr\"{o}ller and Andreas K\"{o}nig and Anna Vilanova i
Bartroli",
year = "2000",
note = "Proceedings of Computer Graphics and Imaging 2000,
IASTED/ACTA Press, 2000, pp. 283-289",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Vilanova-2000-Cyl/",
}
@misc{Mroz-2000-Int,
title = "Interactive High-Quality Maximum Intensity Projection",
author = "Eduard Gr\"{o}ller and Helwig Hauser and Lukas Mroz",
year = "2000",
note = "Computer Graphics Forum 19(3), 2000, pp. C-341 - C-350",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Mroz-2000-Int/",
}
@misc{Mroz-2000-Rea,
title = "Real-Time Maximum Intensity Projection",
author = "Eduard Gr\"{o}ller and Lukas Mroz and Andreas K\"{o}nig",
year = "2000",
note = "In E. Gr\"{o}ller, H. L\"{o}ffelmann, B. Ribarsky (eds.),
Data Visualization'99, Springer Wien, pp. 135-144. Revised
version "Maximum Intensity Projection at Warp Speed" in the
Journal Computers & Graphics, 24(3), June 2000, pp. 343-352",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Mroz-2000-Rea/",
}
@misc{Wegenkittl-2000-Mas,
title = "Mastering Interactive Virtual Bronchioscopy on a Low-End PC",
author = "Freund M.C. and Rainer Wegenkittl and Eduard Gr\"{o}ller and
Balint Heged\"{u}s and Daniel Wagner and Anna Vilanova i
Bartroli",
year = "2000",
note = "IEEE Visualization 2000 Proceedings, 2000, pp. 461-464",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Wegenkittl-2000-Mas/",
}
@misc{Hladuvka-2000-Cur,
title = "Curvature-Based Transfer Functions for Direct Volume
Rendering",
author = "Eduard Gr\"{o}ller and Ji\v{r}\'{i} Hlad\r{u}vka and Andreas
K\"{o}nig",
year = "2000",
note = "Proceedings of Spring Conference on Computer Graphics and
its Applications 2000 (SCCG 2000), Budmerice, Slovakia, May
3rd-6th, 2000, pp. 58-65",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Hladuvka-2000-Cur/",
}
@misc{Koenig-2000-AlVi,
title = "AlVis - An Aluminium-Foam Visualization and Investigation
Tool",
author = "Brigitte Kriszt and Eduard Gr\"{o}ller and Andreas K\"{o}nig
and Helmut Doleisch and Andreas Kottar",
year = "2000",
note = "Joint Eurographics - IEEE TCVG Symposium on Visualization
(VisSym00), Amsterdam, Netherlands",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Koenig-2000-AlVi/",
}
@misc{Csebfalvi-2000-Gra,
title = "Gradient Estimation in Volume Data using 4D Linear
Regression",
author = "Eduard Gr\"{o}ller and L\'{a}szl\'{o} Neumann and Andreas
K\"{o}nig and Bal\'{a}zs Cs\'{e}bfalvi",
year = "2000",
note = "Eurographics 2000, Interlaken, Switzerland",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Csebfalvi-2000-Gra/",
}
@misc{Vilanova-1999-Vir,
title = "VirEn: A Virtual Endoscopy System.",
author = "Eduard Gr\"{o}ller and Andreas K\"{o}nig and Anna Vilanova i
Bartroli",
year = "1999",
note = "Journal Machine Graphics & Vision, Vol 8(3), 1999, pp.
469-487.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Vilanova-1999-Vir/",
}
@misc{Mroz-1999-Real,
title = "Real-Time Maximum Intensity Projection.",
author = "Eduard Gr\"{o}ller and Lukas Mroz and Andreas K\"{o}nig",
year = "1999",
note = "E.Gr\"{o}ller, H. L\"{o}ffelmann, B. Ribarsky (eds.),
Data Visualization'99, Springer Wien, pp.135-144.
Revised version "Maximum Intensity Projection at Warp Speed"
to be published in the Journal Computers & Graphics, June
2000.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Mroz-1999-Real/",
}
@misc{Loeffelmann-1999-SMU,
title = "SMURF a Smart Surface model for advanced visualization
techniques",
author = "Eduard Gr\"{o}ller and Thomas Theu{\ss}l and Andreas
K\"{o}nig and Helwig L\"{o}ffelmann",
year = "1999",
note = "N.M. Thalmann, V. Skala (eds.),
Proceedings of WSCG'99,
The 7-th International Conference in Central Europe on
Computer Graphics, Visualization and Interactive Digital
Media'99, February 8 - 12, 1999, Plzen, Czech Republic, Vol.
I, pp. 156-164.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Loeffelmann-1999-SMU/",
}
@misc{Groeller-1999-Dat,
title = "Data Visualization '99",
author = "Eduard Gr\"{o}ller and William Ribarsky and Helwig
L\"{o}ffelmann",
year = "1999",
note = "Springer 1999",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Groeller-1999-Dat/",
}
@misc{Purgathofer-1999-Gra,
title = "Graphische Datenverarbeitung.",
author = "Eduard Gr\"{o}ller and Werner Purgathofer",
year = "1999",
note = "IPeter Rechenberg, Gustav Pomberger, Handbuch der
Informatik. Carl Hanser Verlag, second edition, pp. 807-854,
1999.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Purgathofer-1999-Gra/",
}
@misc{Groeller-1999-Vis,
title = "Visualization of Dynamical Systems.",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Helwig
L\"{o}ffelmann",
year = "1999",
note = "F.Post, D. Silver (eds.) Journal Future Generation Computer
Systems, Elsevier, Vol. 15(1), February 1999, pp.75-86.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Groeller-1999-Vis/",
}
@misc{Koenig-1999-Mul,
title = "Multiple Views and Magic Mirrors - fMRI Visualization of the
Human Brain.",
author = "Eduard Gr\"{o}ller and Andreas K\"{o}nig and Helmut Doleisch",
year = "1999",
note = "Proceedings of Spring Conference on Computer
Graphics
and its Applications 1999 (SCCG'99), Budmerice, Slovakia,
April 28th.-May 1st, 1999, pp. 130-139.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Koenig-1999-Mul/",
}
@misc{Csebfalvi-1999-Fast,
title = "Fast Maximum Intensity Projection using Binary Shear-Warp
Factorization.",
author = "Eduard Gr\"{o}ller and Andreas K\"{o}nig and Bal\'{a}zs
Cs\'{e}bfalvi",
year = "1999",
note = "N.M. Thalmann, V. Skala (eds.),
Proceedings of WSCG'99,
The 7-th International Conference in Central Europe on
Computer Graphics, Visualization and Interactive Digital
Media'99, February 8 - 12, 1999, Plzen, Czech Republic, Vol.
I, pp. 47-54.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Csebfalvi-1999-Fast/",
}
@misc{Glaeser-1999-Fas,
title = "Fast Generation of Curved Perspectives for Ultra-Wideangle
Lenses in VR-Applications.",
author = "Eduard Gr\"{o}ller and Georg Glaeser",
year = "1999",
note = "Visual Computer, Vol 15(7/8), 1999, pp. 365-376.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1999/Glaeser-1999-Fas/",
}
@misc{Loeffelmann-1998-Vis,
title = "Visualizing Poincar\'{e} Maps together with the Underlying
Flow",
author = "Thomas Kucera and Eduard Gr\"{o}ller and Helwig
L\"{o}ffelmann",
year = "1998",
note = "Proceedings of the International Workshop on Visualization
and Mathematics'97, Berlin-Dahlem, Germany, September,
16.-19., 1997. In H.-Ch. Hege, K. Polthier (eds),
Mathematical Visualization, Springer Heidelberg, 1998, pp.
315-328.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-Vis/",
}
@misc{Meinhart-1998-Tun,
title = "TunVis: Visualizing specific geologic features for tunnel
planning and construction, Proceedings of Spring Conference
on Computer Graphics 1998 (SCCG",
author = "Meinhart H. O. Wegenkittl and Eduard Gr\"{o}ller",
year = "1998",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Meinhart-1998-Tun/",
}
@misc{Koenig-1998-Rea,
title = "Real Time Simulation and Visualization of NC Milling
Processes for Inhomogeneous Materials on Low-End Graphics
Hardware, In F.-E",
author = "Eduard Gr\"{o}ller and Andreas K\"{o}nig",
year = "1998",
note = "Wolters, N. M. Patrikalakis (eds.), Proceedings of CGI'98
(Computer Graphics International), IEEE Computer Society,
Hannover, Germany, June 22-26, 1998, pp. 338-349.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Koenig-1998-Rea/",
}
@misc{Fischel-1998-Cas,
title = "Case study: Visualizing Various Properties of Dynamical
Systems",
author = "Eduard Gr\"{o}ller and Lukas Mroz and Helmut Doleisch and
Helwig L\"{o}ffelmann and Georg Fischel",
year = "1998",
note = "In 6th International Workshop on Digital Image Processing
and Computer Graphics (DIP-97): Applications in Humanities
and Natural Sciences, Emanuel Wenger, Leonid I. Dimitrov,
Editors, Proceedings of SPIE vol 3346, pp. 146-154, (1998).",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Fischel-1998-Cas/",
}
@misc{Fuhrmann-1998-Rea,
title = "Real-Time Techniques for 3D Flow Visualization",
author = "Eduard Gr\"{o}ller and Anton Fuhrmann",
year = "1998",
note = "IEEE Visualization'98 Proceedings, 1998, pp. 305-312.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Fuhrmann-1998-Rea/",
}
@misc{Glaeser-1998-Eff,
title = "Efficient Volume-Generation During the Simulation of
NC-Milling",
author = "Eduard Gr\"{o}ller and Georg Glaeser",
year = "1998",
note = "Proceedings of the International Workshop on Visualization
and Mathematics'97, Berlin-Dahlem, Germany, September,
16.-19., 1997. In H.-Ch. Hege, K. Polthier (eds),
Mathematical Visualization, Springer Heidelberg, 1998, pp.
89-106.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Glaeser-1998-Eff/",
}
@misc{Mroz-1998-Sel,
title = "Selected Trends in Scientific Visualization",
author = "Eduard Gr\"{o}ller and Lukas Mroz and Helwig L\"{o}ffelmann",
year = "1998",
note = "Invited Paper in Proceedings of Spring Conference on
Computer Graphics 1998 (SCCG'98), Budmerice, Slovakia,
April 23.-25., 1998, pp. 17-26.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Mroz-1998-Sel/",
}
@misc{Loeffelmann-1998-Enh,
title = "Enhancing the Visualization of Characteristic Structures in
Dynamical Systems",
author = "Eduard Gr\"{o}ller and Helwig L\"{o}ffelmann",
year = "1998",
note = "Proceedings of 9th EUROGRAPHICS Workshop on Visualization
in Scientific Computing, Blaubeuren, Germany, April 20.-22.,
1998, pp. 35-46. Republished in D. Bartz (ed.),
Visualization in Scientific Computing'98, Springer,
pp.59-68.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-Enh/",
}
@misc{Loeffelmann-1998-Visu,
title = "Visualizing Dynamical Systems near Critical Points,
Proceedings of Spring Conference on Computer Graphics 1998
(SCCG'98), Budmerice, Slovakia, April 23.-25., 1998, pp",
author = "Eduard Gr\"{o}ller and Helmut Doleisch and Helwig
L\"{o}ffelmann",
year = "1998",
note = "175-184.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-Visu/",
}
@misc{Milik-1998-Geo,
title = "Geometry of Mixed-mode Oscillations in the 3-d
Autocatalator",
author = "A. Milik and Eduard Gr\"{o}ller and Helwig L\"{o}ffelmann
and Peter Szmolyan",
year = "1998",
note = "International Journal of Bifurcation and Chaos (IJBC),
World Scientific Publishing Company, Vol. 8(3), pp. 505-519,
March 1998.",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Milik-1998-Geo/",
}
@misc{Glaeser-1998-AFa,
title = "A Fast Shadow Profiler and its Applications",
author = "Eduard Gr\"{o}ller and Georg Glaeser",
year = "1998",
note = "In 6th International Workshop on Digital Image Processing
and Computer Graphics (DIP-97): Applications in Humanities
and Natural Sciences, Emanuel Wenger, Leonid I. Dimitrov,
Editors, Proceedings of SPIE vol 3346, pp. 168-176, (1998).",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Glaeser-1998-AFa/",
}
@inproceedings{jankovic-1995-heter,
title = "Heterogenous Morphing of Multimodal Medical Information",
author = "Vojtech Jankovic and Ruzicky Eugen and Eduard Gr\"{o}ller",
year = "1995",
month = sep,
isbn = "3-540-60268-2",
publisher = "Springer",
location = "Prague, Czech Republic",
editor = "Hlavac, Vaclav; Sara, Radim",
booktitle = "Proceedings of the 6th International Conference on Computer
Analysis of Images and Patterns",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/jankovic-1995-heter/",
}
@article{loeffelmann-1995-para,
title = "Parametrizing Superquadrics",
author = "Helwig L\"{o}ffelmann and Eduard Gr\"{o}ller",
year = "1995",
month = feb,
journal = "Proceedings of WSCG",
note = "TALK: H. L\"{o}ffelmann 14.2.1995",
pages = "162--172",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/loeffelmann-1995-para/",
}
@article{groeller-1995-attract,
title = "Attract - Interactive Visualization of Dynamical Systems",
author = "Eduard Gr\"{o}ller and Herbert Oppolzer",
year = "1995",
month = feb,
journal = "Proceedings of WSCG'95",
pages = "93--102",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-attract/",
}
@inproceedings{groeller-1995-inter,
title = "Interactive Exploration of Dynamical Systems",
author = "Eduard Gr\"{o}ller",
year = "1995",
month = feb,
note = "TALK: 8.2.1995",
location = "San Jose, USA, Convention Center",
booktitle = "Proceedings of Visual Data Exploration and Analysis II, In
IS&T/SPIE Proceedings",
pages = "132--138",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-inter/",
}
@incollection{groeller-1995-appl,
title = "Application of Visualization Techniques to Chaotic Dynamical
Systems",
author = "Eduard Gr\"{o}ller",
year = "1995",
booktitle = "Visualization in Scientific Computing",
editor = "M. G\"{o}bel, H. M\"{u}ller, B. Urban",
publisher = "Springer",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-appl/",
}
@talk{groeller-1995-dyn,
title = "Visualisierung dynamischer Systeme unter
Ber\"{u}cksichtigung lokaler Eigenschaften",
author = "Eduard Gr\"{o}ller",
year = "1995",
event = "Konversatorium aus Operatins Research",
location = "TU Wien, Austria",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-dyn/",
}
@talk{groeller-1995-lok,
title = "Visualisierung f\"{u}r das lokale und globale Verhalten
komplexer dynamischer Systeme",
author = "Eduard Gr\"{o}ller",
year = "1995",
event = "Workshop Visualisierung im Rahmen des DFG-Schwerpunktes ",
location = "Feldberg, BRD",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-lok/",
}
@article{groeller-1995-non,
title = "Nonlinear Raytracing - Visualizing Strange Worlds",
author = "Eduard Gr\"{o}ller",
year = "1995",
issn = "01782789",
journal = "Visual Computer",
number = "5",
volume = "11",
pages = "263--274",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-non/",
}
@article{groeller-1995-mod,
title = "Modeling and Visualization of Knitwear",
author = "Eduard Gr\"{o}ller and R. T. Rau and Wolfgang Stra{\ss}er",
year = "1995",
journal = "IEEE Transaction on Visualization and Computer Graphics",
number = "4",
volume = "1",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-mod/",
}
@talk{groeller-1995-vis,
title = "Visualisierung komplexer dynamischer Systeme",
author = "Eduard Gr\"{o}ller",
year = "1995",
location = "Universit\"{a}t T\"{u}bingen, Deutschland",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/groeller-1995-vis/",
}
@incollection{fischel-1995-vis,
title = "Visualization of Local Stability of Dynamical Systems",
author = "Georg Fischel and Eduard Gr\"{o}ller",
year = "1995",
booktitle = "Visualization in Scientific Computing",
editor = "R. Scateni, J. van Wijk, P. Zanarini",
isbn = "3211827293",
publisher = "Springer",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/fischel-1995-vis/",
}
@inproceedings{groeller-1994-hyper,
title = "Hyperrealistic image synthesis and manipulation",
author = "Eduard Gr\"{o}ller",
year = "1994",
month = nov,
organization = "Symposium ",
note = "TALK: 3.11.1994",
location = "Bratislava, Slovakia",
booktitle = "Proceedings of the Symposium ",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-hyper/",
}
@inproceedings{groeller-1994-int,
title = "Interactive Transformation of 2D Vector Data",
author = "Eduard Gr\"{o}ller",
year = "1994",
month = jun,
organization = "10. Spring Schoon on Computer Graphics '94 and its
applications",
note = "TALK: 8.6.1994",
location = "Bratislava, Slovakia",
booktitle = "Proceedings of the 10. Spring Schoon on Computer Graphics
'94 and its applications",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-int/",
}
@inproceedings{jankovic-1994-phy,
title = "Physically Based Matching of Multimodal Medical Information",
author = "Vojtech Jankovic and Eduard Gr\"{o}ller",
year = "1994",
month = jun,
organization = "10. Spring School on Computer Graphics '94 and its
applications",
location = "Bratislava, Slovakia",
booktitle = "Proceedings of the 10. Spring School on Computer Graphics
'94 and its applications",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/jankovic-1994-phy/",
}
@inproceedings{groeller-1994-appl,
title = "Application of Visualization Techniques to Complex and
Chaotic Dynamical Systems",
author = "Eduard Gr\"{o}ller",
year = "1994",
month = may,
organization = "Eurographics Workshop in Scientific Computing",
note = "TALK: 1.6.1994",
location = "Rostock, BRD",
booktitle = "Proceedings of the 5th Eurographics Workshop on
Visualization in Scientific Computing",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-appl/",
}
@article{groeller-1994-coh,
title = "Coherence in scan-line algorithms for CSG",
author = "Eduard Gr\"{o}ller and Peter Brunner",
year = "1994",
month = jan,
journal = "Proceedings of the Winter School on Computer Graphics '94",
note = "TALK: E. Gr\"{o}ller 19.9.1994",
pages = "19.1.1994--20.1.1994",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-coh/",
}
@article{groeller-1994-ext,
title = "Extended Camera Specification for Image Synthesis",
author = "Eduard Gr\"{o}ller and Helwig L\"{o}ffelmann",
year = "1994",
journal = "Machine Graphics & Vision",
number = "3",
volume = "3",
pages = "514--530",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-ext/",
}
@talk{groeller-1994-tech,
title = "Techniken der Computergraphik zur Analyse dynamischer
Systeme",
author = "Eduard Gr\"{o}ller",
year = "1994",
event = "eingeladener Vortrag im Rahmen eines Konversatoriums aus
Operations Research",
location = "TU Wien",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-tech/",
}
@article{groeller-1994-mod,
title = "Modeling and Rendering of Nonlinear Iterated Function
Systems",
author = "Eduard Gr\"{o}ller",
year = "1994",
journal = "Computers & Graphics",
number = "5",
volume = "18",
pages = "739--748",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-mod/",
}
@talk{groeller-1994-vis,
title = "Visualization Techniques for Complex and Chaotic Dynamical
Systems",
author = "Eduard Gr\"{o}ller",
year = "1994",
event = "Vortrag im Rahmen der Lecture Series on ",
location = "TU Prag",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/groeller-1994-vis/",
}
@inproceedings{groeller-1993-cha,
title = "Chaos und Computergraphik",
author = "Eduard Gr\"{o}ller",
year = "1993",
month = nov,
location = "TU M\"{u}nchen, Deutschland",
booktitle = "Proceedings der Tagung Chaos und Strukturbildung",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-cha/",
}
@inproceedings{groeller-1993-eff,
title = "Efficiency in Computer Graphics: Coherence Principles",
author = "Eduard Gr\"{o}ller and Werner Purgathofer",
year = "1993",
month = jun,
location = "Budmerice, Slovakia",
booktitle = "Proceedings of International Conference on Computer Graphics
ICCG'93",
pages = "26--31",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-eff/",
}
@inproceedings{groeller-1993-oct,
title = "Oct-tracing animation sequences",
author = "Eduard Gr\"{o}ller",
year = "1993",
month = jun,
location = "Budmerice, Slovakia",
booktitle = "Proceedings der International Conference on Computer
Graphics",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-oct/",
}
@incollection{groeller-1993-dist,
title = "A distortion camera for ray tracing",
author = "Eduard Gr\"{o}ller and Pietro Acquisto",
year = "1993",
month = apr,
booktitle = "Visualization and Intelligent Design in Engineering and
Architecture",
editor = "Conner, Hernandez, Murthy, Power",
isbn = "1853122270",
publisher = "Elsevier Science Publishers",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-dist/",
}
@inproceedings{groeller-1993-acc,
title = "ACC-lossless data compression of animation sequences",
author = "Eduard Gr\"{o}ller and W Stocker",
year = "1993",
month = feb,
location = "Bombay, Indien",
booktitle = "Proceedings der International Conference on Computer
Graphics",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-acc/",
}
@incollection{groeller-1993-coh,
title = "Coherence in Computer Graphics",
author = "Eduard Gr\"{o}ller and Werner Purgathofer",
year = "1993",
booktitle = "Visualization and Intelligent Design in Engineering and
Architecture",
editor = "Conner, Hernandez, Murthy, Power",
isbn = "1853122270",
publisher = "Elsevier Science Publishers",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-coh/",
}
@talk{groeller-1993-daten,
title = "Datenkompression und Dateiformate",
author = "Eduard Gr\"{o}ller",
year = "1993",
event = "Seminar Grafik",
location = "Wien",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-daten/",
}
@talk{groeller-1993-disto,
title = "A distrortion camera for ray tracing",
author = "Eduard Gr\"{o}ller",
year = "1993",
event = "Videa' 93, Visualization and Intelligent Design in
Engineering and Architecture",
location = "Southampton, UK",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-disto/",
}
@talk{groeller-1993-exp,
title = "Exploitatino of Coherence Properties in Computer Graphics",
author = "Eduard Gr\"{o}ller",
year = "1993",
location = "Czech Technical University Prague",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-exp/",
}
@talk{groeller-1993-grund,
title = "Grundlagen der Computergrafik",
author = "Eduard Gr\"{o}ller",
year = "1993",
event = "Seminar Grafik",
location = "Wien",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-grund/",
}
@misc{groeller-1993-coh1,
title = "Coherence in Computer Graphics",
author = "Eduard Gr\"{o}ller",
year = "1993",
note = "Schriftenlehre Dissertation der TU Wien des Verbandes der
wissenschaftlichen Gesellschaften \"{O}sterreichs",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-coh1/",
}
@talk{groeller-1993-frak,
title = "Fraktale Geometrie",
author = "Eduard Gr\"{o}ller",
year = "1993",
event = "Seminar Grafik",
location = "Wien",
URL = "https://www.cg.tuwien.ac.at/research/publications/1993/groeller-1993-frak/",
}
@inproceedings{groeller-1992-frac,
title = "Fractals and Solid Modeling",
author = "Eduard Gr\"{o}ller",
year = "1992",
abstract = "Trying to combine fractal geometry and solid modeling seems
to be a contradiction in itself, In this paper a new type of
3D objects is presented that accomplishes this combination
in a specific way. Objects with a fractal macro structure
and a 3D solid micro structure can be specified and rendered
efficiently by using context free, attribute, geometric
grammars. This new object type can be incorporated into the
CSG-modeling technique (Constructive Solid Geometry) in two
ways: a) using CSG for the specification of the micro
structure of the new object type, b) using these fractal
like objects as a new type of primitive in the CSG model.
Ray tracing is used for generating high quality images of
these geometrically complex objects.",
booktitle = "Proceedings of Eurographics'92",
URL = "https://www.cg.tuwien.ac.at/research/publications/1992/groeller-1992-frac/",
}
@talk{groeller-1992-fraktale,
title = "Fraktale in der Lehre",
author = "Eduard Gr\"{o}ller",
year = "1992",
event = "1. Workshop der Fractal-Chaos User Gruppe",
location = "Wien, Austria",
URL = "https://www.cg.tuwien.ac.at/research/publications/1992/groeller-1992-fraktale/",
}
@phdthesis{Groeller-thesis,
title = "Coherence in Computer Graphics",
author = "Eduard Gr\"{o}ller",
year = "1992",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
school = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
URL = "https://www.cg.tuwien.ac.at/research/publications/1992/Groeller-thesis/",
}
@talk{groeller-1992-fractals,
title = "Fractals in the classroom",
author = "Eduard Gr\"{o}ller",
year = "1992",
location = "Comenius Universit\"{a}t Bratislava",
URL = "https://www.cg.tuwien.ac.at/research/publications/1992/groeller-1992-fractals/",
}
@talk{groeller-1992-vis,
title = "Visualisierung nichtlinearer dynamischer Systeme",
author = "Eduard Gr\"{o}ller",
year = "1992",
event = "Kolloquium im Rahmen des SFB ",
location = "Wien, Austria",
URL = "https://www.cg.tuwien.ac.at/research/publications/1992/groeller-1992-vis/",
}
@inproceedings{groeller-1991-temp,
title = "Using Temporal and Spatial Coherence for Accelerating the
Calculation of Animation Sequences",
author = "Eduard Gr\"{o}ller and Werner Purgathofer",
year = "1991",
month = sep,
publisher = "Elsevier Science Publishers",
organization = "Eurographics ",
note = "TALK: M. E. Gr\"{o}ller",
location = "Vienna, Austria",
booktitle = "Tagungsband von Eurographics",
URL = "https://www.cg.tuwien.ac.at/research/publications/1991/groeller-1991-temp/",
}
@inproceedings{groeller-1991-frac,
title = "Fractal Geometry and Computer Graphics",
author = "Eduard Gr\"{o}ller",
year = "1991",
month = may,
organization = "7th spring school on computer graphics",
location = "Bratislava, Slovakia, CSFR",
event = "7th Spring School on Computer Graphics",
booktitle = "Proceedings of 7th spring school on computer graphics",
URL = "https://www.cg.tuwien.ac.at/research/publications/1991/groeller-1991-frac/",
}
@article{groeller-1988-duale,
title = "Duale Voronoizerlegung im R3 mit Simplexmethode",
author = "Eduard Gr\"{o}ller",
year = "1988",
month = apr,
journal = "CAD & Computergraphik",
number = "11",
URL = "https://www.cg.tuwien.ac.at/research/publications/1988/groeller-1988-duale/",
}
@article{groeller-1988-using,
title = "Using Tetrahedrons for Dithering Color Pictures",
author = "Eduard Gr\"{o}ller and Werner Purgathofer",
year = "1988",
month = jan,
journal = "Automatika",
note = "Jugoslawien",
number = "1-2/ 88",
volume = "29",
URL = "https://www.cg.tuwien.ac.at/research/publications/1988/groeller-1988-using/",
}
@talk{purgathofer-1988-using,
title = "Using tetrahedrons for dithering color pictures",
author = "Eduard Gr\"{o}ller and Werner Purgathofer",
year = "1988",
event = "Third International Conference on Computer Graphics",
location = "Jugoslawien",
URL = "https://www.cg.tuwien.ac.at/research/publications/1988/purgathofer-1988-using/",
}
@mastersthesis{groeller-1987-opt,
title = "Optimale Farbauswahl bei Ausgabeger\"{a}ten in der
Graphischen Datenverarbeitung",
author = "Eduard Gr\"{o}ller",
year = "1987",
month = sep,
note = "Diplomarbeit am Institut f\"{u}r Praktische Informatik, TU
Wien",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
school = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
URL = "https://www.cg.tuwien.ac.at/research/publications/1987/groeller-1987-opt/",
}
@talk{Groeller_2016_I7,
title = "Visual Computing for the Analysis of Complex Systems",
author = "Eduard Gr\"{o}ller",
event = "Invited Talk at the Department of Computer Science and
Engineering (CSE) at the Hong Kong University of Science and
Technology (HKUST)",
location = "Invited Talk at the Department of Computer Science and
Engineering (CSE) at the Hong Kong University of Science and
Technology (HKUST)",
URL = "https://www.cg.tuwien.ac.at/research/publications/ongoing/Groeller_2016_I7/",
}