@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{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{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{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/", } @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{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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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{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/", } @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{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{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{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/", } @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{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{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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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_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/", } @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{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/", } @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{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/", } @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{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/", } @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_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{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_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{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{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{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{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_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/", } @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/", } @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{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{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{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/", } @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{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/", } @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/", } @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_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{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_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/", } @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/", } @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{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/", } @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{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{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{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_CVC, title = "Comprehensive Visualization of 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/", } @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-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/", } @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/", } @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/", } @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/", } @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{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/", } @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/", } @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{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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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{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{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/", } @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/", } @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/", } @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-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/", } @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{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{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/", } @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/", } @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{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/", } @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/", } @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/", } @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/", } @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{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/", } @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-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/", } @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/", } @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{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/", } @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{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/", } @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{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/", } @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 de ne 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 di erent way. This illustrates various roles of topology in scienti c 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/", } @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/", } @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{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{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{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/", } @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/", } @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-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/", } @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/", } @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{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/", } @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/", } @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{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{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{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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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/", } @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{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{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{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{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-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/", } @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/", } @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/", } @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{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/", } @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{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/", } @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/", } @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{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{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{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/", } @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/", } @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{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{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{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{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{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{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{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{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{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{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{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{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{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{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{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-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{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{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{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{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{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/", } @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{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{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{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{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{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{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/", } @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/", } @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/", } @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/", } @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-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/", } @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/", } @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/", } @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/", } @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/", } @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-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-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/", } @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/", }