@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/",
}
@techreport{Kanitsar-2004-Dia,
title = "Diagnostic Relevant Visualization of Vascular Structures",
author = "Armin Kanitsar and Dominik Fleischmann and Rainer Wegenkittl
and Eduard Gr\"{o}ller",
year = "2004",
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.",
month = jan,
number = "TR-186-2-04-02",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "curved planar reformation, computed tomography angiography,
vessel analysis",
URL = "https://www.cg.tuwien.ac.at/research/publications/2004/Kanitsar-2004-Dia/",
}
@techreport{Kanitsar-2003-ADV,
title = "Advanced Curved Planar Reformation: Flattening of Vascular
Structures",
author = "Armin Kanitsar and Rainer Wegenkittl and Dominik Fleischmann
and Eduard Gr\"{o}ller",
year = "2003",
abstract = "Traditional volume visualization techniques may provide
incomplete clinical information needed for many applications
in medical visualization. Especially in the area of vascular
visualization important features such as the patent lumen of
a diseased vessel segment may not be visible. Curved Planar
Reformation (CPR) has proven to be an acceptable practical
solution. Existing CPR techniques, however, still have
diagnostically relevant limitations. In this paper we
introduce two advanced methods for efficient vessel
visualization, based on the concept of CPR. Both methods
benefit from relaxation of spatial coherence in favor of
improved feature perception. We present a new technique to
visualize the interior of a vessel in a single image. A
vessel is re-sampled along a spiral around the vessel
central axis. The helical spiral depicts the vessel volume.
Furthermore, a method to display an entire vascular tree
without mutually occluding vessels is presented. Minimal
rotations around the branching points of a vessel tree
eliminate occlusions. For each viewing
direction the entire vessel structure is visible.",
month = may,
number = "TR-186-2-03-08",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "curved planar reformation, vessel analysis, computed
tomography angiography",
URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Kanitsar-2003-ADV/",
}
@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{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{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/",
}
@techreport{kanitsar-2002-Chr,
title = "Christmas Tree Case Study: Computed Tomography as a Tool for
Mastering Complex Real World Objects with Applications in
Computer Graphics",
author = "Armin Kanitsar and Thomas Theu{\ss}l and Lukas Mroz and
Milo\v{s} \v{S}r\'{a}mek and Anna Vilanova i Bartroli and
Bal\'{a}zs Cs\'{e}bfalvi and Ji\v{r}\'{i} Hlad\r{u}vka and
Stefan Guthe and Michael Knapp and Rainer Wegenkittl and
Petr Felkel and Dominik Fleischmann and Werner Purgathofer
and Eduard Gr\"{o}ller",
year = "2002",
abstract = "We report on using computed tomography (CT) as a model
acquisition tool for complex objects in computer graphics.
Unlike other modeling and scanning techniques the complexity
of the object is irrelevant in CT, which naturally enables
to model objects with, for example, concavities, holes,
twists or fine surface details. Once the data is scanned,
one can apply post-processing techniques aimed at its
further enhancement, modification or presentation. For
demonstration purposes we chose to scan a Christmas tree
which exhibits high complexity which is difficult or even
impossible to handle with other techniques. However, care
has to be taken to achieve good scanning results with CT.
Further, we illustrate the post-processing by means of data
segmentation and photorealistic as well as
non-photorealistic surface and volume rendering
techniques.",
month = mar,
number = "TR-186-2-02-07",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "volume visualization, computed tomography, modeling",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/kanitsar-2002-Chr/",
}
@techreport{kanitsar-2002-CPRX,
title = "CPR - Curved Planar Reformation",
author = "Armin Kanitsar and Dominik Fleischmann and Rainer Wegenkittl
and Petr Felkel and Eduard Gr\"{o}ller",
year = "2002",
abstract = "Visualization of tubular structures such as blood vessels is
an important topic in medical imaging. One way to display
tubular structures for diagnostic purposes is to generate
longitudinal cross-sections in order to show their lumen,
wall, and surrounding tissue in a curved plane. This process
is called Curved Planar Reformation (CPR). We present three
different methods to generate CPR images. A tube-phantom was
scanned with Computed Tomography (CT) to illustrate the
properties of the different CPR methods. Furthermore we
introduce enhancements to these methods: thick-CPR,
rotating-CPR and multi-path-CPR.",
month = mar,
number = "TR-186-2-02-06",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "curved planar reformation, vessel analysis, computed
tomography angiography",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/kanitsar-2002-CPRX/",
}
@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/",
}
@inproceedings{Kanitsar-2002-CPR,
title = "CPR- Curved Planar Reformation",
author = "Armin Kanitsar and Dominik Fleischmann and Rainer Wegenkittl
and Petr Felkel and Eduard Gr\"{o}ller",
year = "2002",
publisher = "IEEE Computer Society Press",
booktitle = "IEEE Visualization 2002",
URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Kanitsar-2002-CPR/",
}
@article{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/",
}
@techreport{Vilanova-2001-VCU,
title = "Virtual Colon Unfolding",
author = "Anna Vilanova i Bartroli and Rainer Wegenkittl and Andreas
K\"{o}nig and Eduard Gr\"{o}ller",
year = "2001",
abstract = "The majority of virtual endoscopy techniques tries to
simulate a real endoscopy. A real endoscopy does not always
give the optimal information due to the physical limitations
it is subject to. In this paper, we deal with the unfolding
of the surface of the colon as a possible visualization
technique for diagnosis and polyp detection. A new two-step
technique is presented which deals with the problems of
double appearance of polyps and nonuniform sampling that
other colon unfolding techniques suffer from. In the first
step, a distance map from a central path induces nonlinear
rays for unambiguous parameterization of the surface. The
second step compensates for locally varying distortions of
the unfolded surface. A technique similar to magnification
fields in information visualization is hereby applied. The
technique produces a single view of a
complete virtually dissected colon.",
month = apr,
number = "TR-186-2-01-08",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "Virtual Endoscopy, Volume Rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Vilanova-2001-VCU/",
}
@techreport{Kanitsar-2001-PVI,
title = "Peripheral Vessel Investigation For Routine Clinical Use",
author = "Armin Kanitsar and Rainer Wegenkittl and Petr Felkel and
Dominik Fleischmann and Dominique Sandner and Eduard
Gr\"{o}ller",
year = "2001",
abstract = "This paper is about computed tomography angiography based
vessel exploration. Large image sequences of the lower
extremities are investigated in a clinical environment. Two
different approaches for peripheral vessel diagnosis dealing
with stenosis and calcification detection are introduced.
The paper presents an automated vessel-tracking tool for
curved planar reformation. A user interactive
segmentation tool for bone removal is proposed.",
month = mar,
number = "TR-186-2-01-13",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "optimal path computation, semi automated segmentation, CTA",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Kanitsar-2001-PVI/",
}
@misc{Capek-2001-Mul,
title = "Multimodal Volume Registration Based on Spherical Markers",
author = "M. Capek and W. Jaschke and R. Sweeney and R. Bale and
Rainer Wegenkittl 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, p. 17-24, ISBN
80-7082-711-2",
URL = "https://www.cg.tuwien.ac.at/research/publications/2001/Capek-2001-Mul/",
}
@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-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{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{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{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/",
}
@techreport{Vilanova-2000-VCF,
title = "Virtual Colon Flattening",
author = "Anna Vilanova i Bartroli and Rainer Wegenkittl and Andreas
K\"{o}nig and Eduard Gr\"{o}ller and E. Sorantin",
year = "2000",
abstract = "We present a new method to visualize virtual endoscopic
views. We propose to flatten the organ by the direct
projection of the surface onto a set of cylinders. Two
sampling strategies are presented and the introduced
distortions are studied. A non-photorealistic technique is
presented to enhance the perception of the images. Finally,
an approximate but real-time endoscopic fly-through is
possible by using the data obtained by the
projection technique.",
month = dec,
number = "TR-186-2-00-25",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "Colon Flattening, Volume Rendering, Virtual Colonoscopy",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Vilanova-2000-VCF/",
}
@techreport{Mroz-2000-MasX,
title = "Mastering Interactive Surface Rendering for Java-Based
Diagnostic Applications",
author = "Lukas Mroz and Rainer Wegenkittl and Eduard Gr\"{o}ller",
year = "2000",
abstract = "The display of iso-surfaces in medical data sets is an
important visualization technique used by radiologists for
the diagnosis of volumetric density data sets. The demands
put by radiologists on such a display technique are
interactivity, multiple stacked transparent surfaces and
cutting planes that allow an interactive clipping of the
surfaces. This paper presents a Java based, platform
independent implementation of a very fast surface rendering
algorithm which combines the advantages of explicit surface
representation, splatting, and shear-warp projection to
fulfill all these requirements. The algorithm is implemented
within the context of J-Vision, an application for viewing
and diagnosing medical images which is currently in use at
various hospitals. ",
month = apr,
number = "TR-186-2-00-10",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "medical applications, surface rendering, volume
visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Mroz-2000-MasX/",
}
@techreport{Wegenkitt-2000-MIV,
title = "Mastering Interactive Virtual Bronchioscopy on a Low--End PC",
author = "Rainer Wegenkittl and Anna Vilanova i Bartroli and Balint
Heged\"{u}s and Daniel Wagner and Martin C. Freund and
Eduard Gr\"{o}ller",
year = "2000",
abstract = "Virtual endoscopy presents the cross-sectional acquired
3D-data of a computer tomograph as an endoluminal view. The
common approach for the visualization of a virtual endoscopy
is surface rendering, yielding images close to a real
endoscopy. If external structures are of interest, volume
rendering techniques have to be used. These methods do not
display the exact shape of the inner lumen very well. For
certain applications, e.g. operation planning of a
trans-bronchial biopsy, both, the shape of the inner lumen
as well as outer structures like blood vessels and the tumor
have to be delineated. In this paper a method is described,
that allows a quick and easy hybrid visualization using
overlays of different visualization methods like different
surfaces or volume renderings with different transfer
functions in real time on a low-end PC. To achieve real time
frame rates, image based rendering techniques
have been used.",
month = mar,
number = "TR-186-2-00-13",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "visualization system, virtual endoscopy, medical
visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/2000/Wegenkitt-2000-MIV/",
}
@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{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{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{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/",
}
@techreport{Groeller-1998-VAD,
title = "Visualization of Analytically Defined Dynamical Systems",
author = "Eduard Gr\"{o}ller and Helwig L\"{o}ffelmann and Rainer
Wegenkittl",
year = "1998",
abstract = "The visualization of analytically defined dynamical systems
is important for a thorough understanding of the underlying
system behavior. An overview of theoretical concepts
concerning analytically defined dynamical systems is given.
Various visualization techniques for dynamical systems are
discussed. Three current research directions concerning the
visualization of dynamical systems are treated in more
detail. These are: texture based techniques, visualization
of high-dimensional dynamical systems, and
advanced streamsurface representations. ",
month = feb,
number = "TR-186-2-98-06",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "visualization, dynamical systems",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-VAD/",
}
@techreport{Groeller-1998-TunVis,
title = "TunVis: Visualizing specific geologic features for tunnel
planning and construction",
author = "Horst Otto Meinhart and Rainer Wegenkittl and Eduard
Gr\"{o}ller",
year = "1998",
abstract = "This paper describes a method and a system for visualizing a
virtual tunnel through an existing geologic formation and a
method for the generation of a camera animation along the
tunnel axis. The tunnel is built from geologic data coming
from vertical sample drills from the mountain top along the
selected tunnel axis. Its wire frame model is then edited by
a geologist and image information of the rock appearance is
textured onto the tunnel wall, resulting in a photorealistic
representation of the expected geologic rock formations.
Finally a camera animation and video options are defined to
render a video sequence of the camera
movement.",
month = feb,
number = "TR-186-2-98-08",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "visualization, geologic features, tunnel planning",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-TunVis/",
}
@techreport{Groeller-1998-VDS,
title = "Visualization of Dynamical Systems",
author = "Eduard Gr\"{o}ller and Helwig L\"{o}ffelmann and Rainer
Wegenkittl",
year = "1998",
abstract = "The visualization of analytically defined dynamical systems
is important for a thorough understanding of the underlying
system behavior. An introduction to analytically defined
dynamical systems is given. Various visualization techniques
for dynamical systems are discussed. Several current
research directions concerning the visualization of
dynamical systems are treated in more detail. These are:
texture based techniques, visualization of high-dimensional
dynamical systems, advanced streamsurface representations,
local analysis - Poincare' sections,
visualizing econometric models.",
month = feb,
number = "TR-186-2-98-07",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "visualization, dynamical systems",
URL = "https://www.cg.tuwien.ac.at/research/publications/1998/Groeller-1998-VDS/",
}
@techreport{Wegenkittl-97-FOL,
title = "Fast Oriented Line Integral Convolution for Vector
Field Visualization via the Internet",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller",
year = "1997",
abstract = "Oriented Line Integral Convolution (OLIC) illustrates flow
fields by convolving a sparse texture with an anisotropic
convolution kernel. The kernel is aligned to the underlying
flow of the vector field. OLIC does not only show the
direction of the flow but also its orientation. This paper
presents Fast Rendering of Oriented Line Integral
Convolution (FROLIC), which is approximately two orders of
magnitude faster than OLIC. Costly convolution operations as
done in OLIC are replaced in FROLIC by approximating a
streamlet through a set of disks with varying intensity. The
issue of overlapping streamlets is discussed. Two efficient
animation techniques for animating FROLIC images are
described. FROLIC has been implemented as a Java applet.
This allows researchers from various disciplines (typically
with inhomogenous hardware environments) to conveniently
explore and investigate analytically defined 2D vector
fields.",
month = mar,
number = "TR-186-2-97-07",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "vector field visualization, Line Integral Convolution",
URL = "https://www.cg.tuwien.ac.at/research/publications/1997/Wegenkittl-97-FOL/",
}
@techreport{Wegenkittl-97-VBH,
title = "Visualizing the Behavior of Higher Dimensional
Dynamical Systems",
author = "Rainer Wegenkittl and Helwig L\"{o}ffelmann and Eduard
Gr\"{o}ller",
year = "1997",
abstract = "In recent years scientific visualization has been driven by
the need to visualize high-dimensional data sets within
high-dimensional spaces. However most visualization methods
are designed for showing some statistical features of the
data set. This paper deals with the visualization of
trajectories of high-dimensional dynamical systems which
form a L^n_n data set of a smooth n-dimensional flow. Three
methods that are based on the idea of parallel coordinates
are presented and discussed. Visualizations done with these
new methods are shown and an interactive visualization tool
for the exploration of high-dimensional dynamical systems is
proposed.",
month = mar,
number = "TR-186-2-97-08",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "dynamical system, multi-dimension visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/1997/Wegenkittl-97-VBH/",
}
@phdthesis{Wegenkittl-thesis,
title = "Visualization of Complex Dynamical Systems",
author = "Rainer Wegenkittl",
year = "1997",
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/1997/Wegenkittl-thesis/",
}
@techreport{Wegenkittl-1996-AFR,
title = "Animating Flowfields: Rendering of Oriented Line Integral
Convolution",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Werner
Purgathofer",
year = "1996",
abstract = "Line Integral Convolution (LIC) is a common approach for the
visualization of vector fields. It is well suited for
visualizing the direction of a flow field, but it gives no
information about the orientation of the underlying vectors.
We introduce Oriented Line Integral Convolution (OLIC),
where direction as well as orientation are encoded within
the resulting image. This is achieved by using a low
frequency input texture and a ramp like (unisotropic)
convolution kernel. This method can be animated, whereby the
computation of so called pixel traces fastens the
calculation process. In the result section various OLICs
using simple and real-world vector fields are shown.",
month = dec,
number = "TR-186-2-96-23",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "flowfield visualization, line integral convolution",
URL = "https://www.cg.tuwien.ac.at/research/publications/1996/Wegenkittl-1996-AFR/",
}
@techreport{Wegenkittl-1996-SDI,
title = "Simulation of Differential Interferometry and
Comparison with Experimental Results",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Andreas
Goldsteiner",
year = "1996",
abstract = "This paper presents the computational simulation of a
differential interferometer in a Mach-Zehnder arrangement
with objects located outside the center of the
interferometer. The computer simulation corresponds very
well to an experimental setup. This is illustrated for
several basic phase objects. The theoretical models of these
objects are discussed. The concept of an interactive
visualization system for the analysis of phase objects is
presented and finallysome results allowing a comparison
between experimental and simulated interferograms
are shown.",
month = nov,
number = "TR-186-2-96-22",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "interferometry, simulation",
URL = "https://www.cg.tuwien.ac.at/research/publications/1996/Wegenkittl-1996-SDI/",
}
@techreport{loeffelmann-1996-CVA,
title = "Classifying the Visualization of Analytically Specified
Dynamical Systems",
author = "Helwig L\"{o}ffelmann and Eduard Gr\"{o}ller and Rainer
Wegenkittl and Werner Purgathofer",
year = "1996",
abstract = "In this paper we suggest a classification of visualization
techniques for analytically specified dynamical systems into
four different approaches. We distinguish between local
properties, the topology of behavior, global properties, and
classes of dynamical systems with respect to various topics
of visualization. By presenting advanced visualization
techniques that we applied during three recent projects, we
discuss their embedding within the classification scheme The
dynamical systems visualized are the ``Dynastic Cycle'',
which is a model for rise and fall of dynasties in ancient
China, the ``Wonderland'' model, that simulates the
interactions of population growth, economic activities, and
environmental pollution, and a model for mixed-mode
oscillations, which occurs in chemistry. ",
month = apr,
number = "TR-186-2-96-15",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "visualization, dynamical systems",
URL = "https://www.cg.tuwien.ac.at/research/publications/1996/loeffelmann-1996-CVA/",
}
@techreport{wegenkittl-1996-GTW,
title = "A Guided Tour to Wonderland: Visualizing the Slow-Fast
Dynamics of an Analytical Dynamical System",
author = "Rainer Wegenkittl and Eduard Gr\"{o}ller and Werner
Purgathofer",
year = "1996",
abstract = "The analysis of complex dynamical systems produces large
amounts of data that have to be interpreted efficiently.
Visualizing the phase space of such systems illustrates
geometrically the behavior of the underlying dynamics. This
work investigates the visualization of Wonderland, a four
dimensional econometric model, which describes interactions
between population growth, economic activity and
environmental implications. Wonderland belongs to a class of
interesting dynamical systems with a pronounced slow-fast
dynamics, i.e., some variables are changing much faster than
others. Furthermore the behavior of the Wonderland model is
characterized by manifolds which are not streamsurfaces,
i.e., the flow does not stay within these surfaces. This
paper discusses the application and adaptation of various
visualization techniques to analytical dynamical systems
with special properties as mentioned above.",
month = apr,
number = "TR-186-2-96-11",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "vector field visualization, complex dynamical systems",
URL = "https://www.cg.tuwien.ac.at/research/publications/1996/wegenkittl-1996-GTW/",
}
@techreport{Groeller-1995-GOW,
title = "The Geometry of Wonderland",
author = "Eduard Gr\"{o}ller and Rainer Wegenkittl and Alexandra Milik
and Alexia Prskawetz and Gustav Feichtinger and Warren C.
Sanderson",
year = "1995",
abstract = "We analyze Wonderland - a model of demographic,economic and
environmental interactions - by combining numerical
simulations with basic ideas of geometric singular
perturbation theory. This theory dealing with slow-fast
dynamical systems helps us to gain new insights into the
system's behaviour. We give conditions for the occurrence of
rapid environmental changes in Wonderland. Since the chosen
approach is inherently geometric we also focus on the
visualization of our results.",
month = dec,
number = "TR-186-2-95-17",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "dynamical system, visualization",
URL = "https://www.cg.tuwien.ac.at/research/publications/1995/Groeller-1995-GOW/",
}
@techreport{Groeller-1994-IDN,
title = "Interactive Design of Nonlinear Functions for
Iterated Function Systems",
author = "Eduard Gr\"{o}ller and Rainer Wegenkittl",
year = "1994",
abstract = "The basic requirement for the functions of an Iterated
Function System (IFS for short) is contractivity.
Nevertheless the majority of recent scientific
investigations is concentrating on IFSs defined through a
set of contractive linear functions. Simpler handling of
this kind of functions and a more predictable result is the
main reason for this approach. In this work we use distorted
grids (representing nonlinear functions) to specify an IFS
with a higher degree of flexibility and a higher modelling
capability. A program for modeling these grids with
so-called high-level operations is presented. Attention is
directed to the interactivity of designing the IFS and
rendering its limit set. Therefore a z-Buffer for displaying
the result of a stochastic algorithm is included. Example
images designed with the implemented software system are
presented.",
month = aug,
number = "TR-186-2-94-3",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "iterated function system (IFS), nonlinear, interactive
design, fractals, rendering",
URL = "https://www.cg.tuwien.ac.at/research/publications/1994/Groeller-1994-IDN/",
}