Siemoneit, Oliver, Hubig, Christoph, Schmitz, Bernhard, Ertl, Thomas
Philosophical research in mobiquitous devices still lacks important topics, in particular how mobiquitous devices change us and our perception of the world. It is the aim of this paper, to make a...
Simon Stegmaier, Ulrich Rist, Thomas Ertl
Gaining a comprehensive understanding of turbulent flows still poses one of the great challenges in fluid dynamics. A wellestablished approach to advance this research is the analysis of the vortex...
Applications of Pixel Texturesin Visualization and Realistic Image Synthesis (2009)
Wolfgang Heidrich, Hans-peter Seidel, Thomas Ertl
Abstract With fast 3D graphics becoming more and more available even onlow end platforms, the focus in developing new graphics hardware is beginning to shift towards higher quality rendering and...
Fast Ray Traversal of Tetrahedral and Hexahedral Meshes for Direct Volume Rendering Abstract (2009)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Gerd Marmitt
The importance of high-performance rendering of unstructured or curvilinear data sets has increased significantly, mainly due to its use in scientific simulations such as computational fluid dynamics...
Abstract Topology Preserving Smoothing of Vector Fields (2009)
Rüdiger Westermann, Christopher Johnson, Thomas Ertl
In this paper we propose a technique for topology preserving smoothing of sampled vector fields. In this technique, the vector field data is first converted into a scalar level-set representation. We...
A Case Study: Visualizing Material Point Method Data (2009)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, James Bigler, James Guilkey, Christiaan Gribble, ...
The Material Point Method is used for complex simulation of solid materials represented using many individual particles. Visualizing such data using existing polygonal or volumetric methods does not...
Visualizing the Phonon Map (2009)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, E. Deines, F. Michel, M. Bertram, ...
In this work we present several visualization approaches for analyzing acoustic behavior inside a room. Our methods are based on the results of the phonon tracing algorithm. For a simulated phonon...
Three-Dimensional Visualization Techniques for Crystallographic Information (2009)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Andrew Kaufman, Pin Ren, Bruce Gooch, ...
Northwestern University, Evanston
Yun Jang, Ralf P. Botchen, Andreas Lauser, David S. Ebert, Kelly P. Gaither, Thomas Ertl
Functional approximation of scattered data is a popular technique for compactly representing various types of datasets in computer graphics, including surface, volume, and vector datasets. Typically,...
Rüdiger Westermann, Thomas Ertl
A number of techniques have been proposed for rendering volumetric scalar data sets. Techniques have also been proposed for analyzing the three dimensional information contents of the underlying...
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Nathan A. Carr, Jesse D. Hall, John C. Hart
Assisted by recent advances in programmable graphics hardware, fast rasterization-based techniques have made significant progress in photorealistic rendering, but still only render a subset of the...
Evaluating the Effectiveness of Tree Visualization Systems for Knowledge Discovery (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Yue Wang, Soon Tee Teoh, Kwan-liu Ma
User studies, evaluations, and comparisons of tree visualization systems have so far focused on questions that can readily be answered by simple, automated queries without needing visualization....
Structure-accentuating Dense Flow Visualization (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Sung W. Park, Hongfeng Yu, Ingrid Hotz, ...
Vector field visualization approaches can broadly be categorized into approaches that directly visualize local or integrated flow and approaches that analyze the topological structure and visualize...
T. Möller, R. Machiraju, T. Ertl, M. Chen (editors, Joachim E. Vollrath, Tobias Schafhitzel, ...
We present a framework for interactively visualizing volumetric Adaptive Mesh Refinement (AMR) data. For this purpose we employ complex data structures to map the entire AMR dataset to graphics...
GPU-Accelerated Volume Splatting With Elliptical RBFs (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Neophytos Neophytou, Klaus Mueller, Kevin T. Mcdonnell, ...
The α-histogram: Using Spatial Coherence to Enhance Histograms and Transfer Function Design (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Claes Lundström, Anders Ynnerman, Patric Ljung, ...
The high complexity of Transfer Function (TF) design is a major obstacle to widespread routine use of Direct Volume Rendering, particularly in the case of medical imaging. Both manual and automatic...
Abstract Hardware-Based View-Independent Cell Projection (2008)
Manfred Weiler, Martin Kraus, Thomas Ertl
We present the first, view-independent cell projection algorithm for off-the-shelf programmable graphics hardware. Our implementation performs all computations for the projection and scan conversion...
GPUFLIC: Interactive and Accurate Dense Visualization of Unsteady Flows (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Guo-shi Li, Xavier Tricoche, Charles Hansen
The paper presents an efficient and accurate implementation of Unsteady Flow LIC (UFLIC) on the Graphics Processing Unit (GPU). We obtain the same, high quality texture representation of unsteady...
Structure-accentuating Dense Flow Visualization (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Sung W. Park, Hongfeng Yu, Ingrid Hotz, ...
Vector field visualization approaches can broadly be categorized into approaches that directly visualize local or integrated flow and approaches that analyze the topological structure and visualize...
Thomas Ertl, Ken Joy, Beatriz Santos (editors, S. Seipel, A-k. Forsberg, D. Wesslén
In this paper, we describe an improved method for visualization of thermographic data in the paper and pulp process industry. We present an application that allows process operators to freely choose...
Graphics Hardware (2002), pp. 1–12 (2008)
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Shader Metaprogramming, Michael D. Mccool, Zheng Qin, ...
Modern graphics accelerators have embedded programmable components in the form of vertex and fragment shading units. Current APIs permit specification of the programs for these components using an...
Abstract Pyramid Methods in GPU-Based Image Processing (2008)
Magnus Strengert, Martin Kraus, Thomas Ertl
There are numerous applications and variants of pyramid methods in digital image processing. Many of them feature a linear time complexity in the number of pixels; thus, they are particularly well...
Andreas Hub, Tim Hartter, Thomas Ertl
In previous work we have presented a prototype of an assistant system for the blind that can be used for self-localization and interactive object identification of static objects stored within 3D...
GPU-Accelerated Volume Splatting With Elliptical RBFs (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Neophytos Neophytou, Klaus Mueller, Kevin T. Mcdonnell, ...
Radial Basis Functions (RBFs) have become a popular rendering primitive, both in surface and in volume rendering. This paper focuses on volume visualization, giving rise to 3D kernels. RBFs are...
Context-Controlled Flow Visualization in Augmented Reality (2008)
Eissele, Mike, Kreiser, Matthias, Ertl, Thomas
A major challenge of novel scientific visualization using Augmented Reality is the accuracy of the user/camera position tracking. Many alternative techniques have been proposed, but still there is no...
Thomas Ertl, Ken Joy, Beatriz Santos (editors, O. Rübel, G. H. Weber, ...
To allow a more rigorous understanding of animal gene regulatory networks, the Berkeley Drosophila Transcription Network Project (BDTNP) has developed a suite of methods that support quantitative,...
Abstract Multiresolution Interblock Interpolation in Direct Volume Rendering (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Patric Ljung, Claes Lundström, Anders Ynnerman, ...
We present a direct interblock interpolation technique that enables direct volume rendering of blocked, multiresolution volumes. The proposed method smoothly interpolates between blocks of arbitrary...
Path Line Oriented Topology for Periodic 2D Time-Dependent Vector Fields (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, K. Shi, H. Theisel, T. Weinkauf, ...
This paper presents an approach to extracting a path line oriented topological segmentation for periodic 2D timedependent vector fields. Topological methods aiming in capturing the asymptotic...
B. Smits, J. Rossignac, M. Spagnuolo, David S. Ebert, Georges-pierre Bonneau, ...
llution representation for massive meshes M. Garland ain wavelet design for feature n in computational data sets Jiang, D. Thompson and R. Machiraju wisp model and pseudophysical for interactive...
GPUFLIC: Interactive and Accurate Dense Visualization of Unsteady Flows (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Guo-shi Li, Xavier Tricoche, Charles Hansen
The paper presents an efficient and accurate implementation of Unsteady Flow LIC (UFLIC) on the Graphics Processing Unit (GPU). We obtain the same, high quality texture representation of unsteady...
Thomas Ertl, Ken Joy, Beatriz Santos (editors, K. J. Kruszyński, R. Van Liere, J. A. Ka
Determining the shape of coral structures is an essential step for coral biologists to classify and compare corals. Currently, coral biologists analyze shape by performing manual measurements on...
Abstract Knowledge-Based Out-of-Core Algorithms for Data Management in Visualization (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, David Chisnall, Min Chen, Charles Hansen
Data management is the very first issue in handling very large datasets. Many existing out-of-core algorithms used in visualization are closely coupled with application-specific logic. This paper...
Accelerating Volume Reconstruction with 3D Texture Hardware (2008)
F. Margadant, Physical Optics, School Of Physics, Sydney Australia, U. Cullip, U. Neumann, ...
When volume rendering confocal image stacks, the two main challenges are the bulky datasets to cause bandwidth problems on most systems and the nonuniform volume elements which tenaciously resist...
Improving the Quality of Multi-resolution Volume Rendering (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, H. Younesy, T. Möller, H. Carr
We propose a novel method to improve the quality of multi-resolution visualizations. We reduce aliasing artifacts by approximating the data distribution with a Gaussian basis function at each level...
Application of Semantic Technologies for Representing Patent Metadata (2008)
Mark Giereth, Achim Stäbler, Sören Brügmann, Martin Rotard, Thomas Ertl
Abstract: Patents belong to the few types of public information that have a big impact on national and international economies. During the last years there have been great efforts in making patent...
Simon Stegmaier, Dirc Rose, Thomas Ertl
Active stereo has been used by engineers and industrial designers for several years to enhance the perception of computer generated three-dimensional images. Unfortunately, active stereo requires...
Integrating Dynamic Deformations into Interactive Volume (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Tom Brunet, K. Evan, Nowak Michael Gleicher
Non-linear geometric deformation (or warping) is a useful tool for working with volumes. Unfortunately, the computational expense of performing the resampling needed to implement volume deformation...
Cell Projection of Convex Polyhedra (2008)
I. Fujishiro, K. Mueller, A. Kaufman (editors, Stefan Roettger, Thomas Ertl
Finite element methods commonly use unstructured grids as the computational domain. As a matter of fact, the volume visualization of these unstructured grids is a time consuming task. Here, the...
CVSgrab: Mining the History of Large Software Projects (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, S. L. Voinea, A. Telea
Many software projects use Software Configuration Management systems to support their development process. Such systems accumulate in time large amounts of information useful for process accounting...
Interactive Rendering of Atmospheric Scattering Effects Using Graphics Hardware (2008)
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Yoshinori Dobashi, Tsuyoshi Yamamoto, Tomoyuki Nishita
To create realistic images using computer graphics, an important element to consider is atmospheric scattering, that is, the phenomenon by which light is scattered by small particles in the air. This...
Combining Extended Table Lens and Treemap Techniques for Visualizing Tabular Data (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Alexandru Telea
We present a framework for visualizing large tabular data that combines two views: the table view and the treemap view. The table view extends the known table lens as follows: We cluster related...
Evaluating the Effectiveness of Tree Visualization Systems for Knowledge Discovery (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Yue Wang, Soon Tee Teoh, Kwan-liu Ma
User studies, evaluations, and comparisons of tree visualization systems have so far focused on questions that can readily be answered by simple, automated queries without needing visualization....
Hardware-accelerated Extraction and Rendering of Point Set Surfaces (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, E. Tejada, J. P. Gois, L. G. Nonato, ...
Point-based models are gaining lately considerable attention as an alternative to traditional surface meshes. In this context, Point Set Surfaces (PSS) were proposed as a modeling and rendering...
Volume Composition Using Eye Tracking Data (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Aidong Lu, Ross Maciejewski, David S. Ebert
This paper presents a method to automate rendering parameter selection, simplifying tedious user interaction and improving the usability of visualization systems. Our approach acquires...
A Granular Three Dimensional Multiresolution Transform (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Alireza Entezari, Tai Meng, Steven Bergner, ...
We propose a three dimensional multi-resolution scheme to represent volumetric data in resolutions which are powers of two, resolving the rigidity of the commonly used separable Cartesian...
Denoising 2-D Vector Fields by Vector Wavelet (2008)
Michel A. Westenberg, Thomas Ertl
Noise reduction is an important preprocessing step for many visualization techniques that make use of feature extraction. We propose a method for denoising 2-D vector fields that are corrupted by...
Elektrotechnik Und, Giovani Gomez Estrada, Hauptberichter Prof, Dr. Hans-joachim Bungartz, Mitberichter Prof, ...
Analytical and numerical investigations
Visualizing the Phonon Map (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, E. Deines, F. Michel, M. Bertram, ...
In this work we present several visualization approaches for analyzing acoustic behavior inside a room. Our methods are based on the results of the phonon tracing algorithm. For a simulated phonon...
Deformation Of Finite Element Meshes Using Directly Manipulated Free-Form Deformation (2008)
CrashViewer [5, 18] is a tool for visualizing car crash simulation input and output data consisting of finite element meshes. For a shorter workflow, a feature for local deformation of the car...
A Case Study: Visualizing Material Point Method Data (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, James Bigler, James Guilkey, Christiaan Gribble, ...
The Material Point Method is used for complex simulation of solid materials represented using many individual particles. Visualizing such data using existing polygonal or volumetric methods does not...
Application-Oriented Extensions of Profile Flags (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Matej Mlejnek, Pierre Ermes, Anna Vilanova, ...
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...
Structure-accentuating Dense Flow Visualization (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Sung W. Park, Hongfeng Yu, Ingrid Hotz, ...
Vector field visualization approaches can broadly be categorized into approaches that directly visualize local or integrated flow and approaches that analyze the topological structure and visualize...
Direct Isosurface Extraction from Scattered Volume Data Abstract (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Paul Rosenthal, Lars Linsen
Isosurface extraction is a standard visualization method for scalar volume data and has been subject to research for decades. Nevertheless, to our knowledge, no isosurface extraction method exists...
Generation of Mesh Variants via Volumetrical Representation and Subsequent Mesh (2008)
Summary. Having reliable finite element (FE) meshes is one of the basics of reliable FE simulations. As development times i.e. in the car industry are expected to decrease, engineers need to edit and...
Andreas Hub, Joachim Diepstraten, Thomas Ertl
In this paper we present a new system that assists blind users in orienting themselves in indoor environments. W e developed a sensor module that can be handled like a flashlight by a blind user and...
A multiresolution data decomposition offers a fundamental framework supporting compression, progressive transmission, and level-of-detail (LOD) control for large two or three dimensional data sets...
Robust Surface Detection for Variance Comparison and Dimensional Measurement (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, C. Heinzl, R. Klingesberger, J. Kastner, ...
Figure 1: Homogeneous industrial work piece segmentation based on 3D watershed and constrained elastic-surface nets This paper describes a robust method for creating surface models from volume...
Visualization and Interactive Systems Group, (2008)
Abstract. We present a new downsampling method for structured volume grids, which preserves much more of the topology of a scalar field than existing downsampling methods by preferably selecting...
Abstract Illustrating Magnetic Field Lines using a Discrete Particle Model (2008)
In this paper we demonstrate how a computational physics approach based on a discrete particle model can be employed for the visualization of magnetic field lines. This can be regarded as an...
Robust and Adaptive Surface Reconstruction using Partition of Unity Implicits (2008)
João Paulo, Gois Valdecir, Polizelli-junior Tiago, Etiene Eduardo Tejada, Antonio Castelo, Thomas Ertl, ...
Implicit surface reconstruction from unorganized point sets has been recently approached with methods based on multi-level partition of unity. We improve this approach by addressing local...
Abstract Topology Preserving Smoothing of Vector Fields (2008)
Rüdiger Westermann, Christopher Johnson, Thomas Ertl
In this paper we propose a technique for topology preserving smoothing of sampled vector fields. The vector field data is first converted into a scalar representation in which time surfaces...
GPU-assisted Multi-field Video Volume Visualization (2008)
T. Möller, R. Machiraju, T. Ertl, M. Chen (editors, Ralf P. Botchen, Min Chen, ...
GPU-assisted multi-field rendering provides a means of generating effective video volume visualization that can convey both the objects in a spatiotemporal domain as well as the motion status of...
GPU-Based Hyperstreamlines for Diffusion Tensor Imaging (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, G. Reina, K. Bidmon, F. Enders, ...
We propose a new approach for the visualization of hyperstreamlines, which offers potential for better scalability than the conventional polygon-based approach. Our method circumvents the bandwidth...
Segmentation of Flow Fields using Pattern Matching Abstract (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, J. Ebling, G. Scheuermann
Due to the amount of data nowadays, automatic detection, classification and visualization of features is necessary for a thorough inspection of flow data sets. Pattern matching using vector valued...
Abstract Accelerating Morphological Analysis with Graphics Hardware (2008)
Direct volume rendering is a common means of visualizing three-dimensional data nowadays. It is, however, still a very time consuming process to create informative and visual appealing images....
Abstract Data Reconstruction and Visualization Techniques for Forensic Pathology (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Er Ehlert, Zein Salah, Dirk Bartz
Forensic pathology is largely concerned with the determination of the cause and manner of deaths after accidents, or other circumstances in criminal investigations. A major task in that process is...
Rüdiger Westermann, Thomas Ertl
A number of techniques have been proposed for rendering volumetric scalar data sets. Techniques have also been proposed for analyzing the three dimensional information contents of the underlying...
INTERACTIVE INVESTIGATION AND VISUALIZATION OF 3D VORTEX STRUCTURES (2008)
Tobias Schafhitzel, Daniel Weiskopf, Thomas Ertl
detection, graphics hardware In this paper, we present a fast and accurate method for the combined detection and interactive visualization of vortex structures in 3D flow and their corresponding...
Affiliation Dynamics with an Application to Movie-Actor Biographies (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Ulrik Br, Martin Hoefer, Christian Pich
We propose a visualization approach for dynamic affiliation networks in which events are characterized by a set of descriptors. It uses a radial ripple metaphor to display the passing of time and...
Abstract A Volume Rendering Extension for the OpenSG Scene Graph API (2008)
Thomas Klein, Manfred Weiler, Thomas Ertl
We will present the current state of our ongoing work on a simple to use, extensible and cross-platform volume rendering library. Primary target of our framework is interactive scientific...
Access to Mathematical Expressions in MathML for the Blind (2008)
Martin Rotard, Klaus Bosse, Waltraud Schweikhardt, Thomas Ertl
For visually handicapped people virtual learning environments are a chance to participate in scientific education, because they can access the written content. However mathematical expressions...
A Hardware-Aware Debugger for the OpenGL Shading Language (2008)
Timo Aila, Mark Segal (editors, Magnus Strengert, Thomas Klein, Thomas Ertl
The enormous flexibility of the modern GPU rendering pipeline as well as the availability of high-level shader languages have led to an increased demand for sophisticated programming tools. As the...
Vragments- Relocatability as an Extension to Programmable Rasterization Hardware (2008)
Joachim Diepstraten, Daniel Weiskopf, Martin Kraus, Thomas Ertl
We propose an extension to the pixel pipeline of current programmable rasterization hardware to include the possibility to freely locate the rasterization position of fragments and pixels. The...
Thomas Ertl, Ken Joy, Beatriz Santos (editors, K. J. Kruszyński, R. Van Liere, J. A. Ka
Determining the shape of coral structures is an essential step for coral biologists to classify and compare corals. Currently, coral biologists analyze shape by performing manual measurements on...
GPU-Accelerated Volume Splatting With Elliptical RBFs (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Neophytos Neophytou, Klaus Mueller, Kevin T. Mcdonnell, ...
Radial Basis Functions (RBFs) have become a popular rendering primitive, both in surface and in volume rendering. This paper focuses on volume visualization, giving rise to 3D kernels. RBFs are...
Efficient Surface Reconstruction from Noisy Data using Regularized Membrane Potentials (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, A. C. Jalba
We present a novel, physically-motivated method for surface reconstruction that can recover smooth surfaces from noisy and sparse data sets, without using orientation information. A new volumetric...
Lossless Geometry Compression for Steady-State and Time-Varying Irregular Grids † (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Dan Chen, Yi-jen Chiang, Nasir Memon, ...
In this paper we investigate the problem of lossless geometry compression of irregular-grid volume data represented as a tetrahedral mesh. We propose a novel lossless compression technique that...
Eurographics / IEEE-VGTC Symposium on Visualization (2006) (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors
Many have tried to define or explain what properties make for an effective visualization [Sea95][Shn96][Tuf90]. Elements such as aspect ratio, density, color usage, and typeface variation have been...
Abstract Hardware Based Wavelet Transformations (2008)
Many filtering and feature extraction algorithms use wavelet or related multiscale representations of volume data for edge detection and processing. Due to the computational complexity of these...
Thomas Ertl, Ken Joy, Beatriz Santos (editors, K. J. Kruszyński, R. Van Liere, J. A. Ka
Determining the shape of coral structures is an essential step for coral biologists to classify and compare corals. Currently, coral biologists analyze shape by performing manual measurements on...
Abstract Implicit Adaptive Volume Ray-Casting (2008)
Christoph Lürig, Roberto Grosso, Thomas Ertl
In this work we present an acceleration technique for direct volume rendering, that is based on a preprocessing step. This transforms the original uniform grid into an adaptively reduced tetrahedral...
Orientation as an additional User Interface in Mixed-Reality Environments (2008)
Mike Eißele, Simon Stegmaier, Daniel Weiskopf, Thomas Ertl
Abstract: This paper presents an augmented reality system that makes use of a consumer-level mo-bile device equipped with an inertial orientation sensor. The device maps orientational information to...
Abstract Hardware Accelerated Terrain Rendering by Adaptive Slicing (2008)
Many terrain rendering algorithms have been developed, which perform a variety of mesh optimizations to achieve interactive frame rates. The most prominent approach is the so called continuous level...
Access to Mathematical Expressions in MathML for the Blind (2008)
Martin Rotard, Klaus Bosse, Waltraud Schweikhardt, Thomas Ertl
For visually handicapped people virtual learning environments are a chance to participate in scientific education, because they can access the written content. However mathematical expressions...
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Robert S. Laramee, Christoph Garth, Jürgen Schneider, ...
Stream surfaces are a classic flow visualization technique used to portray the characteristics of vector fields, and texture advection research has made rapid advances in recent years. We present a...
Abstract Pyramid Methods in GPU-Based Image Processing (2008)
Magnus Strengert, Martin Kraus, Thomas Ertl
There are numerous applications and variants of pyramid methods in digital image processing. Many of them feature a linear time complexity in the number of pixels; thus, they are particularly well...
Michael Braitmaier, Manfred Weiler, Thomas Ertl
In this paper we describe a framework that exploits 3D widgets in order to allow for the direct manipulation of scene graph objects. The design of the frameworks is inspired by the OpenInventor...
Ralf P. Botchen, Daniel Weiskopf, Thomas Ertl
We describe texture-based flow visualization techniques that bring out the uncertainties in real-world measured flow data or highlight the deviation of scenarios simulated with different numerical...
A Spectral Visualization System for Analyzing Financial Time Series Data (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Daniel A. Keim, Tilo Nietzschmann, Norman Schelwies, ...
Visual data analysis of time related data sets has attracted much research interest recently, and a number of sophisticated visualization methods have been proposed in the past. In financial...
GPU-assisted Multi-field Video Volume Visualization (2008)
T. Möller, R. Machiraju, T. Ertl, M. Chen (editors, Ralf P. Botchen, Min Chen, ...
GPU-assisted multi-field rendering provides a means of generating effective video volume visualization that can convey both the objects in a spatiotemporal domain as well as the motion status of...
A Simple and Flexible Volume Rendering Framework (2008)
E. Gröller, I. Fujishiro (editors, Simon Stegmaier, Magnus Strengert, Thomas Klein, ...
Figure 1: Various volume renderings of a distance field derived from the Stanford Lucy data set, including translucency, transparent isosurfaces, refraction, and reflection. In this work we present a...
Hierarchical Visualization and Compression of Large Volume Datasets Using GPU Clusters (2008)
Dirk Bartz, Bruno Raffin, Magnus Strengert, Marcelo Magallón, Daniel Weiskopf, ...
We describe a system for the texture-based direct volume visualization of large data sets on a PC cluster equipped with GPUs. The data is partitioned into volume bricks in object space, and the...
Adaptive Sampling in Three Dimensions for Volume Rendering on GPUs ABSTRACT (2008)
Martin Kraus, Magnus Strengert, Thomas Klein, Thomas Ertl
Direct volume rendering of large volumetric data sets on programmable graphics hardware is often limited by the amount of available graphics memory and the bandwidth from main memory to graphics...
Abstract Accelerating 3D Convolution using Graphics Hardware (2008)
Many volume filtering operations used for image enhancement, data processing or feature detection can be written in terms of threedimensional convolutions. It is not possible to yield interactive...
Cell Projection of Convex Polyhedra (2008)
I. Fujishiro, K. Mueller, A. Kaufman (editors, Stefan Roettger, Thomas Ertl
Finite element methods commonly use unstructured grids as the computational domain. As a matter of fact, the volume visualization of these unstructured grids is a time consuming task. Here, the...
A Simple and Flexible Volume Rendering Framework (2008)
E. Gröller, I. Fujishiro (editors, Simon Stegmaier, Magnus Strengert, Thomas Klein, ...
Figure 1: Various volume renderings of a distance field derived from the Stanford Lucy data set, including translucency, transparent isosurfaces, refraction, and reflection. In this work we present a...
Abstract Remote 3D Visualization using Image-Streaming Techniques (2008)
Klaus Engel, Ove Sommer, Christian Ernst, Thomas Ertl
The visualization of large scale data sets is still one of the biggest challenges in scientific visualization. In the field of web-based visualization the handling of such data sets raises new...
Martin Schulz, Frank Reck, Wolf Bartelheimer, Thomas Ertl
This work presents interactive flow visualization techniques specifically adapted for PowerFLOW¤¢ ¥ , a lattice-based CFD code from the EXA corporation. Their Digital Physics¤¦ ¥ fluid...
Real-Time Super Resolution Contextual Close-up of Clinical Volumetric Data (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, T. Taerum, M. C. Sousa, F. Samavati, ...
We present an illustrative visualization system for real-time and high quality rendering of clinical volumetric medical data. Our technique is inspired by a medical illustration technique for...
Hierarchical solutions for the deformable surface problem in visualization (2008)
Christoph Lürig, Leif Kobbelt, Thomas Ertl
In this paper we present a hierarchical approach for the deformable surface technique. This technique is a three dimensional extension of the snake segmentation method. We use it in the context of...
Enhancing Slice-based Visualizations of Medical Volume Data (2008)
Thomas Ertl, Ken Joy, Beatriz Santos (editors, Christian Tietjen, Björn Meyer, Stefan Schlechtweg, ...
Slice-based visualizations of CT and MRI data are frequently used for diagnosis, intervention planning and intraoperative navigation since they allow a precise analysis and localization. We present...
Simulation, Modelling and Rendering of Incompressible Fluids in Real Time (2008)
Thomas Klein, Mike Eissele, Daniel Weiskopf, Thomas Ertl
In this paper we present techniques for the real-time simulation and rendering of liquids. Appropriate approximations to a full 3D simulation are applied to reduce the numerical complexity. Fluid...
Frame-to-Frame Coherent Halftoning in Image Space (2008)
Mike Eissele, Daniel Weiskopf, Thomas Ertl
We present an interactive technique for generating halftoning animations in image space. We specifically consider a halftoning approach that uses screening methods to achieve shading, brightness, and...
Daniel Weiskopf, Marc Borchers, Thomas Ertl, Martin Falk, Oliver Fechtig, Regine Frank, ...
with relativistic and astrophysical visualization, which has been culminating in a substantial engagement for visualization in the Einstein Year 2005---the 100 anniversary of Einstein's...
preprint, original article available at http://dx.doi.org/10.1007/s00371-006-0028-0 (2008)
The Visual Computer, Magnus Strengert, Thomas Klein, Ralf Botchen, Simon Stegmaier, Min Chen, ...
Traditional volume rendering does not incorporate a number of optical properties that are typically observed for semi-transparent materials, such as glass or water, in the real world. Therefore, we...
Eurographics Symposium on Parallel Graphics and Visualization (2004) (2008)
Dirk Bartz Bruno, Bruno Raffin, Magnus Strengert, Marcelo Magallón, Daniel Weiskopf, ...
We describe a system for the texture-based direct volume visualization of large data sets on a PC cluster equipped with GPUs. The data is partitioned into volume bricks in object space, and the...
Efficient Representation of Cortical Convolutions for the Analysis of Brain Surface Topology (2008)
Peter Hastreiter, Christof Rezk-Salama, Günther Greiner, Thomas Ertl
Various time efficient procedures were developed allowing to calculate planar representations of the brain in MR and CT clearly conveying the whole surface topology. For the comparison of the...
Automotive Soiling Simulation Based on Massive Particle Tracing (2008)
Stefan Roettger, Martin Schulz, Wolf Bartelheimer, Thomas Ertl
In the automotive industry Lattice-Boltzmann type flow solvers like PowerFlow from Exa Corporation are becoming increasingly important. In contrast to the traditional finite volume approach PowerFlow...
Hierarchical solutions for the deformable surface problem in visualization (2007)
Christoph Lurig, Leif Kobbelt, Thomas Ertl
In this paper we present a hierarchical approach for the deformable surface technique. This technique is a three dimensional extension of the snake segmentation method. We use it in the context of...
Sven Kuschfeldt, Thomas Ertl, Michael Holzner, Bayerische Motoren, Werke Ag
Numerical finite element simulations of the behavior of a car body in frontal, side or rear impact collision scenarios have become increasingly complex as well as reliable and precise. They are well...
Michael Braitmaier, Manfred Weiler, Thomas Ertl
In this paper we describe a framework that exploits 3D widgets in order to allow for the direct manipulation of scene graph objects. The design of the frameworks is inspired by the OpenInventor...
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Nathan A. Carr, Jesse D. Hall, John C. Hart
Assisted by recent advances in programmable graphics hardware, fast rasterization-based techniques have made significant progress in photorealistic rendering, but still only render a subset of the...
Comparing Reyes and OpenGL on a Stream Architecture Abstract (2007)
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, John D. Owens, Brucek Khailany, Brian Towles, ...
The OpenGL and Reyes rendering pipelines each render complex scenes from similar scene descriptions but differ in their internal pipeline organizations. While the OpenGL organization has dominated...
Low Latency Photon Mapping Using Block Hashing (2007)
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Michael D. Mccool
For hardware accelerated rendering, photon mapping is especially useful for simulating caustic lighting effects on non-Lambertian surfaces. However, an efficient hardware algorithm for the...
Graphics Hardware (2002), pp. 1–12 (2007)
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Shader Metaprogramming, Michael D. Mccool, Zheng Qin, ...
Modern graphics accelerators have embedded programmable components in the form of vertex and fragment shading units. Current APIs permit specification of the programs for these components using an...
Thomas Ertl, Wolfgang Heidrich, Michael Dogget (editors, Mark J. Harris, Greg Coombe, Thorsten Scheuermann, ...
In this paper, we present a method for real-time visual simulation of diverse dynamic phenomena using programmable graphics hardware. The simulations we implement use an extension of cellular...
SaarCOR — A Hardware Architecture for Ray Tracing (2007)
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Jörg Schmittler, Ingo Wald
The ray tracing algorithm is well-known for its ability to generate high-quality images and its flexibility to support advanced rendering and lighting effects. Interactive ray tracing has been shown...
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, Eric Chan, Ren Ng, Pradeep Sen, ...
Real-time programmable graphics hardware has resource constraints that prevent complex shaders from rendering in a single pass. One way to virtualize these resources is to partition shading...
Efficient Representation of Cortical Convolutions for the Analysis of Brain Surface Topology (2007)
Peter Hastreiter, Günther Greiner, Thomas Ertl
Abstract Various time efficient procedures were developed allowing to calculate planar representations of the brain in MR and CT clearly conveying the whole surface topology. For the comparison of...
A Volume Rendering Extension for the OpenSG Scene Graph API (2007)
Thomas Klein, Manfred Weiler, Thomas Ertl
We will present the current state of our ongoing work on a simple to use, extensible and cross-platform volume rendering library. Primary target of our framework is interactive scientific...
Automatic Generation and Non-Photorealistic Rendering of 2+1D Minkowski Diagrams (2007)
Joachim Diepstraten, Daniel Weiskopf, Thomas Ertl, Visualisierung Und Interaktive
In this paper, a system is proposed which can automatically generate 2+1D Minkowski diagrams. We show how these spacetime diagrams reveal more aspects of special relativity than traditional Minkowski...
Stefan Roettger, Stefan Guthe, Daniel Weiskopf, Thomas Ertl, Wolfgang Strasser
For volume rendering of regular grids the display of view-plane aligned slices has proven to yield both good quality and performance. In this paper we demonstrate how to merge the most important...
Dirc Rose, Thomas Ertl, Std Wire Frame
Finite element models used in crash worthiness simulations now contain more than one million mostly quadrilateral elements. Interactive visualization of those models for pre- and postprocessing...
Recently, the classic rendering pipeline in 3D graphics hardware has become flexible by means of programmable geometry engines and rasterization units. This development is primarily driven by the...
Abstract Hardware Accelerated Terrain Rendering by Adaptive Slicing (2007)
Many terrain rendering algorithms have been developed, which perform a variety of mesh optimizations to achieve interactive frame rates. The most prominent approach is the so called continuous level...
Flow Visualization on Hierarchical Cartesian Grids (2007)
Stefan Roettger, Martin Schulz, Wolf Bartelheimer, Thomas Ertl
Abstract. Due to the limitations of the traditional finite volume CFD approach modern Lattice-Boltzmann methods are becoming more and more widespread. The results of developing an efficient...
Smart Hardware-Accelerated Volume Rendering (2007)
S. Hahmann, Stefan Roettger, Stefan Guthe, Daniel Weiskopf, ...
For volume rendering of regular grids the display of view-plane aligned slices has proven to yield both good quality and performance. In this paper we demonstrate how to merge the most important...
Cell Projection of Convex Polyhedra (2007)
I. Fujishiro, K. Mueller, A. Kaufman (editors, Stefan Roettger, Thomas Ertl
Finite element methods commonly use unstructured grids as the computational domain. As a matter of fact, the volume visualization of these unstructured grids is a time consuming task. Here, the...
Mobile Navigation and Augmentation utilizing Real-World Text (2007)
Mobile, smart devices are already available in everyday life. Most of them offer a rich feature set, including camera, GPS antenna, or even WIFI modules. Navigation software utilizing GPS to acquire...
ZOOMABLE USER INTERFACES IN SCALABLE VECTOR GRAPHICS (2007)
Rotard, Martin, Mike, Eissele, Van Putten, Raoul, Ertl, Thomas
Zoomable user interfaces are an evolutionary outgrowth of graphical user interfaces. In this paper we propose a zoomable user interface based on Scalable Vector Graphics. Three-level zooming is...
Hub, Andreas, Kombrink, Stefan, Bosse, Klaus, Ertl, Thomas
We have developed a portable electronic navigation assistant for the deafblind that facilitates independent navigation even in new and complex environments, such as large conference sites. The device...
Hub, Andreas, Hartter, Tim, Kombrink, Stefan, Ertl, Thomas
This study describes the development of a multi-functional assistant system for the blind which combines localisation, real and virtual navigation within modelled environments and the identification...
TANIA A Tactile-Acoustical Navigation and Information Assistant for the 2007 CSUN Conference (2007)
Hub, Andreas, Kombrink, Stefan, Bosse, Klaus, Ertl, Thomas
A navigation assistant based on a tactile-acoustical interface and augmented map information is presented, affording blind people real and virtual explorations of the 2007 CSUN Conference...
Time-Based Haptic Analysis of Protein Dynamics (2007)
Bidmon, Katrin, Reina, Guido, Bös, Fabian, Pleiss, Jürgen, Ertl, Thomas
We present a new approach for evaluating a proteins simulated trajectory via time-based haptic feedback. Molecular-scale trajectories are highly dynamic and thus pose new demands on haptic...
Point-based Stream Surfaces and Path Surfaces (2007)
Tobias Schafhitzel, Eduardo Tejada, Daniel Weiskopf, Thomas Ertl
Figure 1: Visualization of the flow field of a tornado with: (left) a point-based stream surface; (right) the combination of a stream surface and texture-based flow visualization to show the vector...
Hub, Andreas, Hartter, Tim, Ertl, Thomas
In previous work we have presented a prototype of an assistant system for the blind that can be used for self-localization and interactive object identification of static objects stored within 3D...
Tactile-Acoustical Navigation Assistant for Real and Virtual Explorations of the Environment. (2006)
Hub, Andreas, Kombrink, Stefan, Ertl, Thomas
We present a tactile-acoustical navigation assistant for real and virtual explorations of the environment.
SFB 627 Umgebungsmodelle für mobile kontextbezogene Systeme (2006)
Rothermel, Kurt, Ertl, Thomas, Dieter, Fritsch, Kühn, Paul J., Mitschang, Bernhard, Westkämper, Engelbert, ...
Computersysteme, wie wir sie heute kennen, passen sich typischerweise nicht an den Benutzer und dessen Situation an. Erste Beispiele von Systemen, die durch den Bezug zur Realwelt den Kontext des...
Interactive Localization and Recognition of Objects for the Blind (2006)
Hub, Andreas, Hartter, Tim, Ertl, Thomas
We present an improved prototype for the interactive localization and recognition of objects for the blind by matching stereo images, orientation and 3D model information.
Bachthaler, Sven, Strengert, Magnus, Weiskopf, Daniel, Ertl, Thomas
We adopt a technique for texture-based visualization of flow fields on curved surfaces for parallel computation on a GPU cluster. The underlying LIC method relies on image-space calculations and...
Thomas Ertl, Ken Joy, Beatriz Santos (editors, S. Oeltze, A. Ku, F. Grothues, ...
We present static and dynamic techniques to visualize perfusion data and to relate perfusion data to morphologic image data. In particular, we describe the integrated analysis of MRI myocardial...
I.: Visual Signatures in Video Visualization (2006)
Min Chen, Ralf P. Botchen, Rudy R. Hashim, Daniel Weiskopf, Thomas Ertl, Ieee Computer Society, ...
Abstract — Video visualization is a computation process that extracts meaningful information from original video data sets and conveys the extracted information to users in appropriate visual...
I.: Visual Signatures in Video Visualization (2006)
Daniel Weiskopf, Thomas Ertl, Ian Thornto, Min Chen, Min Chen, Ralf P. Botchen, ...
Abstract — Video visualization is a computation process that extracts meaningful information from original video data sets and conveys the extracted information to users in appropriate visual...
GPU-based Multi-Volume Rendering for the Visualization of Functional Brain Images (2006)
Friedemann Rößler, Eduardo Tejada, Thomas Fangmeier, Thomas Ertl, Markus Knauff
Nowadays, medical imaging procedures provide a great variety of data obtained with different modalities. To offer a deeper insight into this data the simultaneous visualization of these images, not...
Path Line Oriented Topology for Periodic 2D Time-Dependent Vector Fields (2006)
Shi, Kuangyu, Theisel, Holger, Weinkauf, Tino, Hauser, Helwig, Hege, Hans-Christian, Seidel, Hans-Peter, ...
This paper presents an approach to extracting a path line oriented topological segmentation for periodic 2D time-dependent vector fields. Topological methods aiming in capturing the asymptotic...
Volumetric Density Capture From a Single Image (2006)
Fuchs, Christian, Chen, Tongbo, Goesele, Michael, Theisel, Holger, Seidel, Hans-Peter, Möller, Torsten, ...
Design of an Object Identification and Orientation Assistant for the Deafblind (2005)
Hub, Andreas, Diepstraten, Joachim, Ertl, Thomas
Remarkable advances have been made in the development and technical optimisation when considering stationary solutions of assistant systems for the visually impaired. For example, recent progress in...
Learning foreign languages by using a new type of orientation assistant for the blind (2005)
Hub, Andreas, Diepstraten, Joachim, Ertl, Thomas
Children and adults often find it difficult to learn basic foreign language vocabulary through conventional teaching methods. This is especially true for blind learners, who lack the benefit of...
Stegmaier, Simon, Klein, Thomas, Strengert, Magnus, Ertl, Thomas
11 pages
Augmented Indoor Modeling for Navigation Support for the Blind (2005)
Hub, Andreas, Diepstraten, Joachim, Ertl, Thomas
In this paper we present a concept for a wide-ranging indoor navigation support for the blind and people with impaired vision. Parts of this work were realized within a new prototype of an indoor...
Stegmaier, Simon, Klein, Thomas, Strengert, Magnus, Ertl, Thomas
We present the design and implementation of a stand-alone system for presentinginteractive 3D graphics applications and arbitrary multimedia contents to apublic audience. The description includes...
Stegmaier, Simon, Klein, Thomas, Strengert, Magnus, Ertl, Thomas
We present the design and implementation of a stand-alone system for presenting interactive 3D graphics applications and arbitrary multimedia contents to a public audience. The description includes...
Pulpavitalitätsdiagnostik mittels Laser-Doppler-Anemometrie / (2005)
Zugl.: Berlin, Charité, Universiẗat-Med., Diss., 2005.
Marco Lohse, Betreuender Hochschullehrer Supervisor, Prof Dr. -ing, Gutachter Reviewers, Prof Dr. -ing, ...
Prof. Dr. rer. nat. Hans-Peter Seidel
Real-Time Advection and Volumetric Illumination for the Visualization of 3D Unsteady Flow (2005)
Daniel Weiskopf, Tobias Schafhitzel, Thomas Ertl
This paper presents an interactive technique for the dense texture-based visualization of unsteady 3D flow, taking into account issues of computational efficiency and visual perception. High...
Interactive Visualization of Divergence in Unsteady Flow by Level-Set Dye Advection (2005)
Daniel Weiskopf, Ralf Botchen, Thomas Ertl
Dye advection is an intuitive and versatile technique to visualize both steady and unsteady flow. Dye can be easily combined with noise-based vector field representations and is an important element...
Texture-Based Visualization of Uncertainty in Flow Fields (2005)
Ralf Botchen Daniel, Thomas Ertl
In this paper, we present two novel texture-based techniques to visualize uncertainty in time-dependent 2D flow fields. Both methods use semi-Lagrangian texture advection to show flow direction by...
Thomas Klein Magnus, Thomas Klein, Magnus Strengert, Simon Stegmaier, Thomas Ertl
GPU-based raycasting offers an interesting alternative to conventional slice-based volume rendering due to the inherent flexibility and the high quality of the generated images. Recent advances in...
A generic software framework for the gpu volume rendering pipeline (2005)
Joachim E. Vollrath, Daniel Weiskopf, Thomas Ertl
This paper presents an extendable, simple, and efficient software framework that implements the GPU-based volume rendering pipeline. We use volume graphics for realistic image synthesis taking into...
Thomas Klein, Magnus Strengert, Simon Stegmaier, Thomas Ertl
Figure 1: Various high-quality volume renderings of anatomical data sets generated with our GPU-based raycasting system. All visualizations use a combination of isosurface rendering and...
Augmented Indoor Modeling for Navigation Support for the Blind (2005)
Andreas Hub, Joachim Diepstraten, Thomas Ertl
Abstract- In this paper we present a concept for a wide-ranging indoor navigation support for the blind and people with impaired vision. Parts of this work were realized within a new prototype of an...
A tactile web browser for the visually disabled (2005)
Martin Rotard, Sven Knödler, Thomas Ertl
The dissemination of information available through the World Wide Web makes universal access more and more important and supports visually disabled people in their everyday life. In this paper we...
Frame-to-Frame Coherent Halftoning in Image Space (2004)
Eißele, Mike, Weiskopf, Daniel, Ertl, Thomas
We present an interactive technique for generating halftoning animations in image space. We specically consider a halftoning approach that uses screening methods to achieve shading, brightness, and...
Orientation as an additional User Interface in Mixed-Reality Environments (2004)
Eißele, Mike, Stegmaier, Simon, Weiskopf, Daniel, Ertl, Thomas
This paper presents an augmented reality system that makes use of a consumer-level mobile device equipped with an inertial orientation sensor. The device maps orientational information to user...
Design and development of an indoor navigation and object identification system for the blind (2004)
Hub, Andreas, Diepstraten, Joachim, Ertl, Thomas
In this paper we present a new system that assists blind users in orienting themselves in indoor environments. We developed a sensor module that can be handled like a flashlight by a blind user and...
Wissenschaftliche Visualisierung Ausgewählte Forschungsprojekte (2004)
Die Hauptbeiträge dieser Ausgabe belegen eindrucksvoll den Stand der Forschung, den die wissenschaftliche Visualisierung inzwischen erreicht hat. Allerdings kann das große Spektrum der Anwendungen...
Texture-Encoded Tetrahedral Strips (2004)
Manfred Weiler, Paula N. Mallón, Martin Kraus, Thomas Ertl
Figure 1: Volume visualizations of tetrahedral meshes which have been encoded in a compact texture representation based on tetrahedral strips and are stored in the texture memory of the graphics...
A Graphics Hardware-based Vortex Detection and Visualization System (2004)
Feature detection in flow fields is a well researched area, but practical application is often difficult due to the numerical complexity of the algorithms preventing interactive use and due to noise...
Interactively Visualizing Procedurally Encoded Scalar Fields (2004)
O. Deussen, C. Hansen, D. A. Keim, D. Saupe (editors, Yun Jang, Manfred Weiler, ...
Figure 1: RBF reconstruction of unstructured CFD data. (a) Volume rendering of 1,943,383 tetrahedral shock data set using 2,932 RBF functions. (b) Volume rendering of a 156,642 tetrahedral oil...
Martin Rotard, Daniel Weiskopf, Thomas Ertl
In this paper we report on five years of teaching experience with our introductory course "Graphical-Interactive Systems", which covers basic Human-Computer Interaction (HCI) and Computer...
Convexification of Unstructured Grids (2004)
Stefan Roettger, Stefan Guthe, Andreas Schieber, Thomas Ertl
Unstructured tetrahedral grids are a common data representation of three-dimensional scalar fields. For convex unstructured meshes efficient rendering methods are known. For concave or cyclic meshes,...
The G²-Buffer Framework (2004)
Mike Eißele, Daniel Weiskopf, Thomas Ertl
The geometric buffer (G-buffer) is a well-known approach to implement imagebased rendering algorithms. We propose a framework that maps the G-buffer concept and associated image-space operations to...
We propose a novel approach for a dense texture-based visualization of vector fields on curved surfaces. Our texture advection mechanism relies on a Lagrangian particle tracing that is simultaneously...
Curriculum for a Course on Scientific Visualization (2004)
Martin Rotard, Daniel Weiskopf, Thomas Ertl
In this paper we present a curriculum for an advanced graduate course on scientific visualization. Based on our experiences with ten years of teaching this field, we have come to a stable list of...
Maintaining Constant Frame Rates in 3D Texture-Based Volume Rendering (2004)
Daniel Weiskopf, Manfred Weiler, Thomas Ertl
D texture-based volume rendering is a popular way of realizing direct volume visualization on graphics hardware. However, the slice-oriented texture memory layout of many current GPUs may lead to a...
Hierarchical Visualization and Compression of Large Volume Datasets Using GPU Clusters (2004)
Dirk Bartz, Bruno Raffin, Magnus Strengert, Marcelo Magallon, Daniel Weiskopf, ...
We describe a system for the texture-based direct volume visualization of large data sets on a PC cluster equipped with GPUs. The data is partitioned into volume bricks in object space, and the...
GPU-Based 3D Texture Advection for the Visualization of Unsteady Flow Fields (2004)
We present an interactive visualization approach for the dense representation of unsteady 3D flow fields. The first part of this approach is a GPU-based 3D texture advection scheme that allows a...
Vom Fachbereich Mathematik, Doktors Der Naturwissenschaften, Robert Strzodka, Aus Tarnowitz, Korreferent Prof, ...
zur Erlangung des akademischen Grades eines
Intuitive, Interactive, and Robust Modification and Optimization of Finite Element Models (2004)
Katrin Bidmon, Dirc Rose, Thomas Ertl
Figure 1: Tools for interactive editing: (a) interactive stretching and deformation of a car component; (b) 1D parameter texture revealing node relocation caused by relaxation. Virtual prototyping...
Thomas Klein, Simon Stegmaier, Thomas Ertl
Volume visualization using isosurface extraction is a well-researched topic. Recent research demonstrated that even for unstructured grids peak performances of millions of tetrahedra per second can...
A Graphics Hardware-based Vortex Detection and Visualization System (2004)
We propose a system that provides interactive denoising, vortex detection, and visualization of vector data. All the major phases of the system are implemented on a GPU (graphics processing unit)....
Hierarchical Visualization and Compression of Large Volume Datasets Using GPU Clusters (2004)
Magnus Strengert, Marcelo Magallón, Daniel Weiskopf, Stefan Guthe, Thomas Ertl
We describe a system for the texture-based direct volume visualization of large data sets on a PC cluster equipped with GPUs. The data is partitioned into volume bricks in object space, and the...
Abstract Hierarchical Splatting of Scattered 4D Data (2004)
Matthias Hopf, Michael Luttenberger, Thomas Ertl, Hierarchical Visualization
Visualizing large uncorrelated point data sets with regular volume rendering produces unsatisfying results due to low spatial resolution. For timedependent data available main memory can be a...
Real-Time Visualisation of Urban Landscapes Using Open-Source Software (2003)
Kada, Martin, Roettger, Stefan, Weiss, Karsten, Ertl, Thomas, Fritsch, Dieter
The paper presents the results of the project GISMO, which aimed on generating and interactively visualising a 3D urban landscape model of the city of Stuttgart, Germany. With respect to the desired...
Widening the Remote Visualization Bottleneck (2003)
Stegmaier, Simon, Diepstraten, Joachim, Weiler, Manfred, Ertl, Thomas
With the advent of generic remote visualization solutions, accessing distant graphics resources from the desktop is no longer restricted to specially tailored applications. However, current solutions...
Improved Hardware-Accelerated Visual Hull Rendering (2003)
Li, Ming, Magnor, Marcus, Seidel, Hans-Peter, Ertl, Thomas, Girod, Bernd, Greiner, Günther, ...
The visual hull is an efficient shape approximation for the purpose of reconstructing and visualizing dynamic objects. Recently, rapid progress in graphics hardware development has made it possible...
Improved Hardware-Accelerated Visual Hull Rendering (2003)
Li, Ming, Magnor, Marcus, Seidel, Hans-Peter, Ertl, Thomas, Girod, Bernd, Greiner, Günther, ...
The visual hull is an efficient shape approximation for the purpose of reconstructing and visualizing dynamic objects. Recently, rapid progress in graphics hardware development has made it possible...
A Parallel Framework for Silhouette-based Human Motion Capture (2003)
Theobalt, Christian, Carranza, Joel, Magnor, Marcus, Seidel, Hans-Peter, Ertl, Thomas, Girod, Bernd, ...
A Parallel Framework for Silhouette-based Human Motion Capture (2003)
Theobalt, Christian, Carranza, Joel, Magnor, Marcus, Seidel, Hans-Peter, Ertl, Thomas, Girod, Bernd, ...
Using Feature Flow Fields for Topological Comparison of Vector Fields (2003)
Theisel, Holger, Rössl, Christian, Seidel, Hans-Peter, Ertl, Thomas, Girod, Bernd, Greiner, Günther, ...
In this paper we propose a new topology based metric for 2D vector fields. This metric is based on the concept of feature flow fields. We show that it incorporates both the characteristics and the...
Convex Boundary Angle Based Flattening (2003)
Zayer, Rhaleb, Rössl, Christian, Seidel, Hans-Peter, Ertl, Thomas, Girod, Bernd, Greiner, Günther, ...
A Solid-State, Simultaneous Wide Angle-Detailed View Video Surveillance Camera (2003)
Oi, R., Magnor, Marcus, Aizawa, K., Ertl, Thomas, Girod, Bernd, Greiner, Günther, ...
Fast volumetric display of natural gaseous phenomena (2003)
Mesh simplification algorithms play an important role in computer graphics. In particular, view-dependent simplification methods are utilized widely to reduce the geometric complexity of large...
Daniel Weiskopf, Gordon Erlebacher, Thomas Ertl
We propose Unsteady Flow Advection–Convolution (UFAC) as a novel visualization approach for unsteady flows. It performs time evolution governed by pathlines, but builds spatial correlation...
Resampling of Large Datasets for Industrial Flow Visualization (2003)
Simon Stegmaier, Martin Schulz, Thomas Ertl
Many industrial flow simulations calculated in the car development process are defined on unstructured grids. However, visualization of unstructured grids is computationally expensive and often does...
Hierarchical splatting of scattered data (2003)
Numerical particle simulations and astronomical observations create huge data sets containing uncorrelated 3D points of varying size. These data sets cannot be visualized interactively by simply...
Simulation, modelling and rendering of incompressible fluids in real time (2003)
Thomas Klein, Mike Eissele, Daniel Weiskopf, Thomas Ertl
In this paper we present techniques for the real-time simulation and rendering of liquids. Appropriate approximations to a full 3D simulation are applied to reduce the numerical complexity. Fluid...
Guided Navigation in Task-Oriented 3D Graph Visualizations (2003)
Guido Reina Sven, Sven Lange-last, Klaus Engel, Thomas Ertl
In many application areas an optimal visualization of a complex graph depends on the specific task to be accomplished by the user. Therefore a means of locally customizable layouts is required to...
Daniel Weiskopf, Gordon Erlebacher, Thomas Ertl
We propose Unsteady Flow Advection--Convolution (UFAC) as a novel visualization approach for unsteady flows. It performs time evolution governed by pathlines, but builds spatial correlation according...
Widening the Remote Visualization Bottleneck (2003)
Simon Stegmaier Joachim, Joachim Diepstraten, Manfred Weiler, Thomas Ertl
With the advent of generic remote visualization solutions, accessing distant graphics resources from the desktop is no longer restricted to specially tailored applications. However, current solutions...
Hardware-Based Ray Casting for Tetrahedral Meshes (2003)
Manfred Weiler Martin, Martin Kraus, Markus Merz, Thomas Ertl
We present the first implementation of a volume ray casting algorithm for tetrahedral meshes running on off-the-shelf programmable graphics hardware. Our implementation avoids the memory transfer...
Smart Hardware-Accelerated Volume Rendering (2003)
S. Hahmann, Stefan Roettger, Stefan Guthe, Daniel Weiskopf, ...
For volume rendering of regular grids the display of view-plane aligned slices has proven to yield both good quality and performance. In this paper we demonstrate how to merge the most important...
Cell Projection of Convex Polyhedra (2003)
I. Fujishiro, K. Mueller, A. Kaufman (editors, Stefan Roettger, Thomas Ertl
Finite element methods commonly use unstructured grids as the computational domain. As a matter of fact, the volume visualization of these unstructured grids is a time consuming task. Here, the...
Daniel Weiskopf, Gordon Erlebacher, Thomas Ertl
We propose Unsteady Flow Advection–Convolution (UFAC) as a novel visualization approach for unsteady flows. It performs time evolution governed by pathlines, but builds spatial correlation...
Interactive Visualization of Large Finite Element Models (2003)
Std Wire Frame, Dirc Rose, Thomas Ertl
Finite element models used in crash worthiness simulations now contain more than one million mostly quadrilateral elements. Interactive visualization of those models for pre- and postprocessing...
Widening the Remote Visualization Bottleneck (2003)
Simon Stegmaier, Joachim Diepstraten, Manfred Weiler, Thomas Ertl
With the advent of generic remote visualization solutions, accessing distant graphics resources from the desktop is no longer restricted to specially tailored applications. However, current solutions...
Daniel Weiskopf, Gordon Erlebacher, Thomas Ertl
We propose Unsteady Flow Advection–Convolution (UFAC) as a novel visualization approach for unsteady flows. It performs time evolution governed by pathlines, but builds spatial correlation...
Real-Time Visualisation of Urban Landscapes Using Open-Source Software (2003)
Martin Kada, Stefan Roettger, Karsten Weiss, Thomas Ertl, Dieter Fritsch
The paper presents the results of the project GISMO, which aimed on generating and interactively visualising a 3D urban landscape model of the city of Stuttgart, Germany. With respect to the desired...
A Depth-Cueing Scheme Based on Linear Transformations in Tristimulus Space (2002)
Weiskopf, Daniel, Ertl, Thomas
10 pages
Verwendung von Scalable Vector Graphics und MathML in web-basierten Lernumgebungen (2002)
Rotard, Martin, Schweikhardt, Waltraud, Ertl, Thomas
15 pages
Verwendung von Scalable Vector Graphics und MathML in web-basierten Lernumgebungen (2002)
Rotard, Martin, Schweikhardt, Waltraud, Ertl, Thomas
In web-basierten Lernumgebungen werden Rastergraphiken eingesetzt, um Skizzenund Formeln darzustellen. Dies erschwert den Austausch und die Wiederverwendungvon Lehrmaterialien unter Lernenden und...
A Depth-Cueing Scheme Based on Linear Transformations in Tristimulus Space (2002)
Weiskopf, Daniel, Ertl, Thomas
We propose a generic and flexible depth-cueing scheme which subsumes manywell-known and new color-based depth-cueing approaches. In particular, itincludes standard intensity depth-cueing and rather...
Verwendung von Scalable Vector Graphics und MathML in web-basierten Lernumgebungen (2002)
Rotard, Martin, Schweikhardt, Waltraud, Ertl, Thomas
In web-basierten Lernumgebungen werden Rastergraphiken eingesetzt, um Skizzen und Formeln darzustellen. Dies erschwert den Austausch und die Wiederverwendung von Lehrmaterialien unter Lernenden und...
A Depth-Cueing Scheme Based on Linear Transformations in Tristimulus Space (2002)
Weiskopf, Daniel, Ertl, Thomas
We propose a generic and flexible depth-cueing scheme which subsumes many well-known and new color-based depth-cueing approaches. In particular, it includes standard intensity depth-cueing and rather...
Asymptotic Analysis of Three-Point Approximations of Vertex Normals and Curvatures (2002)
Anoshkina, Elena, Belyaev, Alexander, Seidel, Hans-Peter, Greiner, Günther, Niemann, Heinrich, Ertl, Thomas, ...
Interactive Semi-Transparent Volumetric Textures (2002)
Lensch, Hendrik P. A., Daubert, Katja, Seidel, Hans-Peter, Greiner, Günther, Niemann, Heinrich, Ertl, Thomas, ...
Volumetric textures are often used to increase the visual complexity of an object without increasing the polygon count. Although it is much more efficient in terms of memory to store only the volume...
Proceedings of Vision, Modeling, and Visualization VMV 2002 (2002)
Greiner, Günther, Niemann, Heinrich, Ertl, Thomas, Girod, Bernd, Seidel, Hans-Peter
Localizing the Final Gathering for Dynamic Scenes using the Photon Map (2002)
Tawara, Takehiro, Myszkowski, Karol, Seidel, Hans-Peter, Greiner, Günther, Niemann, Heinrich, Ertl, Thomas, ...
Rendering of high quality animations with global illumination effects is very costly using traditional techniques designed for static scenes. In this paper we present an extension of the photon...
Multi-Layer Skeleton Fitting for Online Human Motion Capture (2002)
Theobalt, Christian, Magnor, Marcus, Schüler, Pascal, Seidel, Hans-Peter, Greiner, Günther, Niemann, Heinrich, ...
Multi-Layer Fitting for Online Human Motion Capture (2002)
Theobalt, Christian, Magnor, Marcus, Schüler, Pascal, Seidel, Hans-Peter, Greiner, Günther, Niemann, Heinrich, ...
Mesh Smoothing by Adaptive and Anisotropic Gaussian Filter (2002)
Ohtake, Yutaka, Belyaev, Alexander, Seidel, Hans-Peter, Greiner, Günther, Niemann, Heinrich, Ertl, Thomas, ...
In this paper, we develop a fully automatic mesh filtering method that adaptively smoothes a noisy mesh and preserves sharp features and features consisting of only few triangle strips. In addition,...
Image based reconstruction and interaction with 2D vector fields (2002)
Pérez Risquet, Carlos, Theisel, Holger, Greiner, Günther, Niemann, Heinrich, Ertl, Thomas, Girod, Bernd, ...
This paper addresses the problem of symmetrical 2D flow visualization and presents solutions to compute a vector field from a flow image. Based on these solutions new, interactions mechanisms are...
Hardware-accelerated Dynamic Light Field Rendering (2002)
Goldluecke, Bastian, Magnor, Marcus, Wilburn, Bennett, Greiner, Günther, Niemann, Heinrich, Ertl, Thomas, ...
We present a system capable of interactively displaying a dynamic scene from novel viewpoints by warping and blending images recorded from multiple synchronized video cameras. It is tuned for...
Shadow Volumes Revisited (2002)
Stefan Roettger, Er Irion, Thomas Ertl
We present a method to utilize the Shadow Volume Algorithm by Crow and Williams without using a stencil buffer. We show that the shadow mask can be generated in the alpha channel or even in the...
A generic solution for hardware-accelerated remote visualization (2002)
Simon Stegmaier, Marcelo Magallón, Thomas Ertl
This paper presents a generic solution for hardware-accelerated remote visualization that works transparently for all OpenGL-based applications and OpenGL-based scene graphs. Universality is achieved...
High-Quality Unstructured Volume Rendering on the PC Platform (2002)
Wolfgang Heidrich, Michael Doggett (editors, Stefan Guthe, Stefan Roettger, Andreas Schieber, Wolfgang Strasser, ...
For the visualization of volume data the application of transfer functions is used widely. In this area the preintegration technique allows high quality visualizations and the application of...
High-Quality Unstructured Volume Rendering on the PC Platform (2002)
Wolfgang Heidrich, Michael Doggett (editors, Stefan Guthe, Stefan Roettger, Andreas Schieber, Wolfgang Strasser, ...
For the visualization of volume data the application of transfer functions is used widely. In this area the preintegration technique allows high quality visualizations and the application of...
Simplification of Nonconvex Tetrahedral Meshes (2002)
We present a new solution to the well-known problems of edge collapses in nonconvex tetrahedral meshes. Additionally, our method is able to handle meshes with topologically non-trivial boundaries and...
VIZARD II: A Reconfigurable Interactive Volume Rendering System (2002)
Thomas Ertl, Wolfgang Heidrich, Michael Doggett (editors, M. Meißner, U. Kanus, G. Wetekam, ...
This paper presents a reconfigurable, hardware accelerated, volume rendering system for high quality perspective ray casting. The volume rendering accelerator performs ray casting by calculating the...
Abstract A Depth-Cueing Scheme Based on Linear Transformations in Tristimulus Space (2002)
Fakultät Informatik, Interaktive Systeme, Daniel Weiskopf, Thomas Ertl, Bericht Nr, ...
We propose a generic and flexible depth-cueing scheme which subsumes many well-known and new color-based depth-cueing approaches. In particular, it includes standard intensity depth-cueing and rather...
HardwareAccelerated Lagrangian-Eulerian Texture Advection for 2D Flow Visualizations (2002)
Daniel Weiskopf, Gordon Erlebacher, Matthias Hopf, Thomas Ertl
A hardware-based approach for visualizing unsteady flow fields by means of Lagrangian-Eulerian advection is presented. Both noise-based and dyebased texture advection is supported. The implementation...
Simplification of Nonconvex Tetrahedral Meshes (2002)
Summary. The simplification of nonconvex tetrahedral meshes with the help of edge collapses (edge contractions) is considerably more complex than the corresponding simplification of convex meshes. In...
Parallelizing Sparse Grid Volume Visualization with Implicit Preview and Load Balancing (2001)
5 pages
Diese Arbeit beinhaltet im Wesentlichen die Untersuchung von dünnenhalbleitenden PTCDA-Aufdampfschichten mit gezielt einstellbarer n-Leitfähigkeit.Die Einstellung der Leitfähigkeit durch...
Parallelizing Sparse Grid Volume Visualization with Implicit Preview and Load Balancing (2001)
New algorithms that work entirely on sparse grids can create data sets thatcannot be handled on uniform grids any more due to their size. On the otherhand, most visualization techniques are only...
Parallelizing Sparse Grid Volume Visualization with Implicit Preview and Load Balancing (2001)
New algorithms that work entirely on sparse grids can create data sets that cannot be handled on uniform grids any more due to their size. On the other hand, most visualization techniques are only...
High-Quality Pre-Integrated Volume Rendering Using Hardware-Accelerated Pixel Shading (2001)
Klaus Engel, Martin Kraus, Thomas Ertl
We introduce a novel texture-based volume rendering approach that achieves the image quality of the best post-shading approaches with far less slices. It is suitable for new flexible consumer...
Parallel volume rendering using PC graphics hardware (2001)
Marcelo Magallón, Matthias Hopf, Thomas Ertl
This paper describes an architecture that enables the use of commodity off the shelf graphics hardware along with high speed network devices for distributed volume rendering. Several PCs drive a...
Daniel Weiskopf, Matthias Hopf, Thomas Ertl
We present hardware-accelerated texture advection techniques to visualize the motion of particles in steady or time-varying vector fields given on Cartesian grids. We propose an implementation of 2D...
On-the-Fly Adaptive Subdivision Terrain (2001)
Dirc Rose, Martin Kada, Thomas Ertl
In this paper we present a method to achieve interactive rendering of smooth terrain based on coarse data. Therefore we use adaptive subdivision surfaces which are calculated on the fly by using...
Interactive Data Exploration with Customized Glyphs (2001)
We present a visualization system allowing non-programmers to visualize, explore, and analyze unknown multivariate data by designing an appropriate glyph representation with minimal user interaction....
On-the-Fly Adaptive Subdivision Terrain (2001)
Dirc Rose, Martin Kada, Thomas Ertl
In this paper we present a method to achieve interactive rendering of smooth terrain based on coarse data. Therefore we use adaptive subdivision surfaces which are calculated on the fly by using...
Tübingen, Universiẗat, Diss., 2001.
Todays car body models used for crash-worthiness simulations consist of around half a million finite elements. The interactive visualization of these large scale time-dependent geometries with...
A Level-Set Method For Flow Visualization (2000)
Rudiger Westermann, Christopher Johnson, Thomas Ertl
Figure 1: Dense flow fields are first converted into a scalar field, and then displayed and analyzed by means of level-sets in this field. An oracle that is based on the discrete curvature of...
Hardware-Accelerated Volume and Isosurface Rendering Based on Cell-Projection (2000)
Stefan Rottger, Martin Kraus, Thomas Ertl
We present two beneficial rendering extensions to the Projected Tetrahedra (PT) algorithm by Shirley and Tuchman. These extensions are compatible with any cell sorting technique, for example the...
A Framework for Interactive Hardware Accelerated Remote 3D-Visualization (2000)
Klaus Engel, Ove Sommer, Thomas Ertl
Abstract. In this paper we present a framework that provides remote control to Open Inventor or Cosmo3D based visualization applications. A visualization server distributes a visualization session to...
Level-Of-Detail Volume Rendering via 3D Textures (2000)
Manfred Weiler, Rudiger Westermann, Chuck Hanseny, Kurt Zimmermany, Thomas Ertl
Figure 1: All images show 3D texture based volume rendering of the engine data set. On the left, the data set is displayed with full resolution. In the middle, two different levels of detail are used...
Embedding Visualization Software Into A Simulation Environment (2000)
In the process of product development, several software tools are involved. Such tools are CAD, simulation and vizualization tools. During development process, the engineer must switch from one tool...
Hardware Accelerated Wavelet Transformations (2000)
Abstract. Wavelets and related multiscale representations are important means for edge detection and processing as well as for segmentation and registration. Due to the computational complexity of...
Rendering Details on Simplified Meshes by Texture Based Shading (2000)
In this paper we present a way to use OpenGL 1.2 compliant graphics hardware for fast shading with textures containing detailed information about the normals of an object. The procedure is similar to...
Accelerating Morphological Analysis with Graphics Hardware (2000)
Direct volume rendering is a common means of visualizing three-dimensional data nowadays. It is, however, still a very time consuming process to create informative and visual appealing images....
A Level-Set Method For Flow Visualization (2000)
Rudiger Westermann, Christopher Johnson, Thomas Ertl
Figure 1: Dense flow fields are first converted into a scalar field, and then displayed and analyzed by means of level-sets in this field. An oracle that is based on the discrete curvature of...
A Level-Set Method for Flow Visualization (2000)
Rudiger Westermann Christopher, Christopher Johnson, Thomas Ertl
In this paper we propose a technique for visualizing steady flow. Using this technique, we first convert the vector field data into a scalar level-set representation. We then analyze the dynamic...
Level-Of-Detail Volume Rendering via 3D Textures (2000)
Manfred Weiler, Rüdiger Westermann, Chuck Hansen, Kurt Zimmerman, Thomas Ertl
Figure 1: All images show 3D texture based volume rendering of the engine data set. On the left, the data set is displayed with full resolution. In the middle, two different levels of detail are used...
A Framework for Interactive Hardware Accelerated Remote 3D-Visualization (2000)
Klaus Engel, Ove Sommer, Thomas Ertl
Abstract. In this paper we present a framework that provides remote control to Open Inventor or Cosmo3D based visualization applications. A visualization server distributes a visualization session to...
Hardware Accelerated Wavelet Transformations (2000)
Abstract. Wavelets and related multiscale representations are important means for edge detection and processing as well as for segmentation and registration. Due to the computational complexity of...
A Framework for Interactive Hardware Accelerated Remote 3D-Visualization (2000)
Klaus Engel, Ove Sommer, Thomas Ertl
Abstract. In this paper we present a framework that provides remote control to Open Inventor or Cosmo3D based visualization applications. A visualization server distributes a visualization session to...
Isosurface extraction techniques for web-based volume visualization (1999)
Klaus Engel, Rüdiger Westermann, Thomas Ertl
The reconstruction of isosurfaces from scalar volume data has positioned itself as a fundamental visualization technique in many different applications. But the dramatically increasing size of...
Isosurface Extraction Techniques for Web-based Volume Visualization (1999)
Klaus Engel, Rüdiger Westermann, Thomas Ertl
The reconstruction of isosurfaces from scalar volume data has positioned itself as a fundamental visualization technique in many different applications. But the dramatically increasing size of...
Applications of Pixel Textures in Visualization and Realistic Image Synthesis (1999)
Wolfgang Heidrich, Rüdiger Westermann, Hans-peter Seidel, Thomas Ertl
With fast 3D graphics becoming more and more available even on low end platforms, the focus in developing new graphics hardware is beginning to shift towards higher quality rendering and additional...
Applications of Pixel Textures in Visualization and Realistic Image Synthesis (1999)
Wolfgang Heidrich, Rüdiger Westermann, Hans-peter Seidel, Thomas Ertl
With fast 3D graphics becoming more and more available even on low end platforms, the focus in developing new graphics hardware is beginning to shift towards higher quality rendering and additional...
Decoupling Polygon Rendering from Geometry using Rasterization Hardware (1999)
Rüdiger Westermann, Ove Sommer, Thomas Ertl
Abstract. The dramatically increasing size of polygonal models resulting from 3D scanning devices and advanced modeling techniques requires new approaches to reduce the load of geometry transfer and...
Texture-based Volume Visualization for Multiple Users on the World Wide Web (1999)
Abstract. We present a texture-based volume visualization tool, which permits remote access to radiological data and supports multi-user environments. The application uses JAVA and the Virtual...
Isosurface extraction techniques for web-based volume visualization (1999)
Klaus Engel, Rüdiger Westermann, Thomas Ertl
The reconstruction of isosurfaces from scalar volume data has positioned itself as a fundamental visualization technique in many different applications. But the dramatically increasing size of...
Remote 3D visualization using image-streaming techniques (1999)
Klaus Engel, Ove Sommer, Christian Ernst, Thomas Ertl
1 Introduction and Related Work The World Wide Web provides access to a huge amount of scien-tific data. New algorithms and applications have to be developed in order to visualize such data on the...
Deformable surfaces for feature based indirect volume rendering (1998)
Christoph Lurig, Leif Kobbelt, Thomas Ertl
In this paper we present an indirect volume visualization method, based on the deformable surface model, which is a three dimensional extension of the snake segmentation method. In contrast to...
Particle tracing on sparse grids (1998)
Christian Teitzel, Roberto Grosso, Thomas Ertl
Abstract. These days sparse grids are of increasing interest in numerical simulations. Based upon hierarchical tensor product bases, the sparse grid approach is a very efficient one improving the...
Volume Visualization on Sparse Grids (1998)
Christian Teitzel, Matthias Hopf, Thomas Ertl
The ever growing size of data sets resulting from industrial and scientific simulations and measurements have created an enormous need for analysis tools allowing interactive visualization. A...
Fast and Interactive 3D-Segmentation of Medical Volume Data (1998)
The segmentation of tomographic image data is an important prerequisite for a meaningful visualization in medicine. To circumvent difficulties related to automatic approaches, we suggest interactive...
Interactive Animation of Volume Line Integral Convolution Based on 3D Texture Mapping (1998)
Christof Rezk-Salama, Peter Hastreiter, Christian Teitzel, Thomas Ertl
. Line integral convolution (LIC) is an effective technique for visualizing vector fields. The application of LIC to 3D flow fields has yet been limited by difficulties to efficiently display and...
Integrated Registration and Visualization of Medical Image Data (1998)
Different imaging modalities give insight to vascular, anatomical and functional information which assist diagnosis and therapy planning in medicine. Registration and consecutive visualization allow...
New Approaches for Particle Tracing on Sparse Grids (1998)
Christian Teitzel And, Christian Teitzel, Thomas Ertl
. Flow visualization tools based on particle methods continue to be an important utility of flow simulation. Additionally, sparse grids are of increasing interest in numerical simulations. In [13] we...
Christian Teitzel, Matthias Hopf, Roberto Grosso, Thomas Ertl
. Volume rendering is an important technique of displaying volumetric three-dimensional scalar data sets resulting from measurement or simulation. Additionally, sparse grids are of increasing...
Particle Tracing on Sparse Grids (1998)
Christian Teitzel Roberto, Roberto Grosso, Thomas Ertl
. These days sparse grids are of increasing interest in numerical simulations. Based upon hierarchical tensor product bases, the sparse grid approach is a very efficient one improving the ratio of...
Efficient Representation of Cortical Convolutions for the Analysis of Brain Surface Topology (1998)
Peter Hastreiter Christof, Christof Rezk--salama, Gunther Greiner, Thomas Ertl
Various time efficient procedures were developed allowing to calculate planar representations of the brain in MR and CT clearly conveying the whole surface topology. For the comparison of the...
Progressive Iso-surfaces on the Web (1998)
Klaus Engel, Roberto Grosso, Thomas Ertl
Visualization of volume data on the WWW using the Virtual Reality Modeling Language (VRML) and the Java programming language offers new perspectives for distributed and platform independent...
Volume Ray Casting on Sparse Grids (1998)
Christian Teitzel, Matthias Hopf, Roberto Grosso, Thomas Ertl
These days sparse grids are of increasing interest in numerical simulations. Based upon hierarchical tensor product bases, the sparse grid approach is a very efficient one improving the ratio of...
An Interactive Visualization and Navigation Tool for Medical Volume Data (1998)
Ove Sommer, Er Dietz, Rüdiger Westermann, Thomas Ertl
In order to make direct volume rendering practicable convenient visualization options and data analysis tools have to be integrated. For example, direct rendering of semi-transparent volume objects...
Roberto Grosso, Christoph Lurig, Thomas Ertl
Multilevel representations and mesh reduction techniques have been used for accelerating the processing and the rendering of large datasets representing scalar or vector valued functions defined on...
The vsbuffer: Visibility ordering of unstructured volume primitives by polygon drawing (1997)
Rudiger Westermann, Thomas Ertl
Different techniques have been proposed for rendering volumetric scalar data sets. Usually these approaches are focusing on orthogonal cartesian grids, but in the last years research did also...
Christian Teitzel, Roberto Grosso, Thomas Ertl
. In real applications the velocity field of a flow is not available in analytical but in discrete form. One goal of this paper is to analyze particle integration methods for discretized data defined...
Distributed Volume Raycasting On Maspar Mp-I In An Integrated Environment (1997)
Matthias Hopf Roberto, Roberto Grosso, Thomas Ertl
Volume rendering is an important tool in scientific visualization. However, due to the fact that it is computational very expensive, applications on standard workstations are not capable of providing...
Line Integral Convolution on Triangulated Surfaces (1997)
Christian Teitzel, Roberto Grosso, Thomas Ertl
Line Integral Convolution (LIC), introduced by Cabral and Leedom in 1993, is a powerful technique for generating striking images of vector data. Based on local filtering of an input texture along a...
The Use of a Virtual Environment for FE Analysis of Vehicle Crash Worthiness (1997)
Sven Kuschfeldt, Martin Schulz, Thomas Ertl, Thomas Reuding, Michael Holzner, Entwicklung Karosserie
ontrol the animation. Finally, geometry nodes contain the topological information of the vertices as well as graphic attributes of the polygons like color, transparency and lighting. Geometry nodes...
Fast Mutual Information Based Registration And Fusion Of Registered Tomographic Image Data (1997)
Peter Hastreiter, Jörg Freund, Günther Greiner, Thomas Ertl
Registration of medical image data of different modalities and the consecutive fusion of registered data are the basis for visualization in medical imaging. The applied alignment procedure is based...
Implicit Adaptive Volume Ray-Casting (1997)
Christoph Lurig, Roberto Grosso, Thomas Ertl
In this work we present an acceleration technique for direct volume rendering, that is based on a preprocessing step. This transforms the original uniform grid into an adaptively reduced tetrahedral...
Line Integral Convolution on Triangulated Surfaces (1997)
Christian Teitzel Roberto, Roberto Grosso, Thomas Ertl
Line Integral Convolution (LIC), introduced by Cabral and Leedom in 1993, is a powerful technique for generating striking images of vector data. Based on local filtering of an input texture along a...
Christian Teitzel, Roberto Grosso, Thomas Ertl
. In real applications the velocity field of a flow is not available in analytical but in discrete form. One goal of this paper is to analyze particle integration methods for discretized data defined...
Christian Teitzel Roberto, Roberto Grosso, Thomas Ertl
. In real applications the velocity field of a flow is not available in analytical but in discrete form. One goal of this paper is to analyze particle integration methods for discretized data defined...
Roberto Grosso, Christoph Lürig, Thomas Ertl
Multilevel representations and mesh reduction techniques have been used for accelerating the processing and the rendering of large datasets representing scalar or vector valued functions defined on...
Adaptive Multilevel Finite Elements for Mesh Optimization and Visualization (1997)
Roberto Grosso, Christoph Lürig, Thomas Ertl
Multilevel representations and mesh reduction techniques have been used for accelerating the processing and the rendering of large datasets representing scalar or vector valued functions defined on...
Distributed Volume Raycasting On Maspar Mp-I In An Integrated Environment (1997)
Matthias Hopf, Roberto Grosso, Thomas Ertl
Volume rendering is an important tool in scientific visualization. However, due to the fact that it is computational very expensive, applications on standard workstations are not capable of providing...
Combining Wavelet Transform and Graph Theory for Feature Extraction and Visualization (1997)
Christoph Lürig, Roberto Grosso, Thomas Ertl
. In the process of visualizing 3D MRI or CT data using techniques such as isosurfacing or direct volume rendering, one is confronted with two problems. The first one is that there is no distinction...
Mesh Optimization and Multilevel Finite Element Approximations (1997)
. Mesh reduction techniques are used for accelerating the visualization process for large datasets. Typical examples are scalar or vector valued functions defined on complex 2 or 3 dimensional...
A Multiscale Approach to Integrated Volume Segmentation and Rendering (1997)
Rüdiger Westermann, Thomas Ertl
A number of techniques have been proposed for rendering volumetric scalar data sets. Techniques have also been proposed for analyzing the three dimensional information contents of the underlying...
Line Integral Convolution on Triangulated Surfaces (1997)
Christian Teitzel Roberto, Roberto Grosso, Thomas Ertl
Line Integral Convolution (LIC), introduced by Cabral and Leedom in 1993, is a powerful technique for generating striking images of vector data. Based on local filtering of an input texture along a...
Efficient data structures for volume rendering of wavelet-compressed data (1996)
Roberto Grosso, Thomas Ertl, Joachim Aschoff
Volume rendering is compute intensive and requires huge amounts of memory. Many methods were proposed to improve performance, but the problems of dealing with large data sets still remain. Muraki was...
Abstract: For the visualization of 3D datasets from medical imaging modalities (MR, CT, PET) a volume rendering technique based on the texture mapping hardware of highend workstations, as suggested...
Distributed Volume Visualization: A Step Towards Integrated Data Analysis and Image Synthesis (1996)
Rüdiger Westermann, Thomas Ertl
. Integrated on-the-fly data analysis and image synthesis is one of the most dominant challenges on modern volume visualization tools. Since volume visualization algorithms are themself...
Advanced Visualization of Crashworthiness Simulations using Virtual Reality Techniques (1996)
Martin Schulz, Thomas Reuding, Michael Holzner, Thomas Ertl, Sven Kuschfeldt Martin, Sven Kuschfeldt, ...
Regarding the increasing complexity of computer simulations on one hand and the development of computer technology in the last few years on the other hand, the demand on new visualization techniques...
Peter Hastreiter, Hüseyin Kemâl Çakmak, Thomas Ertl
: For the visualization of 3D datasets from medical imaging modalities (MR, CT, PET) a volume rendering technique based on the texture mapping hardware of highend workstations, as suggested by Cabral...
Peter Hastreiter, Walter Hopfer, Thomas Ertl
For the retrospective, rigid body registration of two 3D datasets from different modalities (MR, CT and PET) an automatic, voxel based approach, as suggested by Collignon et al. [3], was implemented...
Flow Visualization for Multiblock Multigrid Simulations (1996)
Roberto Grosso, Martin Schulz, Jan Kraheberger, Thomas Ertl
. Multiblock multigrid finite volume methods based on hexahedral control volumes are computationally efficient and widely used for solving the NavierStokes equations. Due to the enormous amount of...
Efficient Data Structures for Volume Rendering of Wavelet-Compressed Data (1996)
Roberto Grosso, Thomas Ertl, Joachim Aschoff
Volume rendering is compute intensive and requires huge amounts of memory. Many methods were proposed to improve performance, but the problems of dealing with large data sets still remain. Muraki was...
Video Integration of PAM-VIEW Visualization Results (1995)
Sven Kuschfeldt, Michael Holzner, Thomas Ertl
A very efficient way to analyze computer simulations is to integrate the visualization of the results into video sequences. However, most postprocessors available today in the area of car crash...
Biorthogonal Wavelet Filters for Frequency Domain Volume Rendering (1995)
. Rendering images from three-dimensional discrete data sets usually involves interpolation between samples. In terms of signal processing theory, common interpolation methods like trilinear and...