Isosurface-based generation of hulls encompassing neuronal pathways (2009)
Merhof, Dorit, Meister, Martin, Bingöl, Ezgi, Nimsky, Christopher, Greiner, Günther
Diffusion tensor imaging provides information about the location of white matter tracts within the human brain. For neurosurgery, this imaging technique is of major interest in order to minimize the...
gridlib: Flexible and Efficient Grid Management for Simulation and Visualization (2008)
Frank Hülsemann, Peter Kipfer, Ulrich Rüde, Günther Greiner
Abstract. This paper describes the gridlib project, a unified grid management framework for simulation and visualization. Both, adaptive PDE-solvers and interactive visualization toolkits, have to...
Abstract Hexagonal LOD for Interactive Terrain Rendering (2008)
Gerd Sußner, Carsten Dachsbacher, Günther Greiner
In this paper we present a novel abstraction layer above the well-known triangular 1-to-4 split subdivision based on hexagons. This approach allows adaptive bidirectional subdivision, that is...
Abstract Depth Buffer Based Registration of Free-form Surfaces (2008)
Ulf Labsik, Roman Sturm, Günther Greiner
Many algorithms have to deal with multiple representations of the same object. The process of aligning these representations is called registration. In this paper we present a new approach for the...
Kai Hormann, Martin Meister, Ulf Labsik, Günther Greiner
Figure 1: First three levels and final result of our hierarchical iso-surface extraction algorithm. In this paper we present a novel approach to iso-surface extraction which is based on a...
In the field of reverse engineering one often faces the problem of repairing triangulations with holes, intersecting triangles, Möbius-band-like structures or other artifacts. In this paper we...
G.: Local exact particle tracing on unstructured grids (2008)
Peter Kipfer, Frank Reck, Günther Greiner
For analyzing and interpreting results of flow simulations, particle tracing is a well established visualization method. In addition, it is a preliminary step for more advanced techniques like line...
Dorit Merhof, Martin Meister, Ezgi Bingöl, Peter Hastreiter, Christopher Nimsky, Günther Greiner
Abstract. Diffusion tensor imaging provides information about structure and location of white matter tracts within the human brain which is of particular interest for neurosurgery. The reconstruction...
Abstract Hierarchical Extraction of Iso-Surfaces with Semi-Regular Meshes (2008)
Kai Hormann, Ulf Labsik, Martin Meister, Günther Greiner
Figure 1: First three levels and final result of our hierarchical iso-surface extraction algorithm. In this paper we present a novel approach to iso-surface extraction which is based on a...
Non-rigid Registration with Use of Hardware-Based 3D Bézier Functions (2008)
Grzegorz Soza, Michael Bauer, Peter Hastreiter, Christopher Nimsky, Günther Greiner
Abstract. In this paper we introduce a new method for non-rigid voxelbased registration. In many medical applications there is a need to establish an alignment between two image datasets. Often a...
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...
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...
Merhof, Dorit, Meister, Martin, Bingöl, Ezgi, Hastreiter, Peter, Nimsky, Christopher, Greiner, Günther
Diffusion tensor imaging provides information about structure and location of white matter tracts within the human brain which is of particular interest for neurosurgery. The reconstruction of...
Fast and accurate connectivity analysis between functional regions based on DT-MRI (2006)
Merhof, Dorit, Richter, Mirco, Enders, Frank, Hastreiter, Peter, Ganslandt, Oliver, Buchfelder, Michael, ...
Diffusion tensor and functional MRI data provide insight into function and structure of the human brain. However, connectivity analysis between functional areas is still a challenge when using...
Streamline visualization of diffusion tensor data based on triangle strips (2006)
Merhof, Dorit, Sonntag, Markus, Enders, Frank, Nimsky, Christopher, Hastreiter, Peter, Greiner, Günther
For the visualization of diffusion tensor imaging data, different approaches have been presented such as scalar metrics, glyphs or streamlines. Thereby, streamline techniques commonly referred to as...
Exact and Approximate Quadratures for Curvature Tensor Estimation (2005)
Langer, Torsten, Belyaev, Alexander, Seidel, Hans-Peter, Greiner, Günther, Hornegger, Joachim, Niemann, Heinrich, ...
Accurate estimations of geometric properties of a surface from its discrete approximation are important for many computer graphics and geometric modeling applications. In this paper, we derive exact...
Efficient Acquisition and Realistic Rendering of Car Paint (2005)
Günther, Johannes, Chen, Tongbo, Goesele, Michael, Wald, Ingo, Seidel, Hans-Peter, Greiner, Günther, ...
The outside appearance of cars is mostly defined through only two distinct materials -- glass and car paint. While glass can rather easily be simulated by the simple physical laws of reflection and...
Merhof, Dorit, Hastreiter, Peter, Nimsky, Christopher, Fahlbusch, Rudolf, Greiner, Günther
Diffusion tensor imaging measures diffusion of water in tissue. Within structured tissue, such as neural fiber tracts of the human brain, anisotropic diffusion is observed since the cell membranes of...
Visualization of diffusion tensor data using evenly spaced streamlines (2005)
Merhof, Dorit, Sonntag, Markus, Enders, Frank, Hastreiter, Peter, Fahlbusch, Rudolf, Nimsky, Christopher, ...
Diffusion tensor imaging allows investigating white matter structures in vivo which is of particular interest for neurosurgery. A promising approach for the reconstruction of neural pathways are...
O Vega Higuera, Natascha Sauber, Bernd Tom, Christopher Nimsky, Günther Greiner, Peter Hastreiter
Direct volume visualization of computer tomography data is based on the mapping of data values to colors and opacities with lookup-tables known as transfer functions. Often, limitations of...
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, ...
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...
Simulation and Rendering of Liquid Foams (2002)
Hendrik Kück, Christian Vogelgsang, Günther Greiner
In this paper we present a technique for simulating and rendering liquid foams. We are aiming at a functional realism that allows our simulation to be consistent with the physical effects in real...
Intraoperative augmented reality for minimally invasive liver interventions (2002)
Michael Scheuering, Andrea Schenk, Armin Schneider, Bernhard Preim, Günther Greiner
Minimally invasive liver interventions demand a lot of experience due to the limited access to the field of operation. In particular, the correct placement of the trocar and the navigation within the...
Hardware accelerated visualization of curvilinear vector fields (2002)
Frank Reck, Christof Rezk-salama, Roberto Grosso, Günther Greiner
We present a novel method for hardwareaccelerated texture advection of 3D velocity fields defined on curvilinear grids. For uniform rectilinear grids, texture advection can be efficiently performed...
Interactive Repositioning of Bone Fracture Segments. Vision, Modeling and Visualization (VMV (2001)
Michael Scheuering, Christof Rezk-salama, Christian Eckstein, Kai Hormann, Günther Greiner
This paper presents an application for semiautomatic repositioning of bone fractures that allows the merging of several fragments. This application has been developed with regard to orthopaedic...
Interactive Repositioning of Bone Fracture Segments. Vision, Modeling and Visualization (VMV (2001)
Michael Scheuering, Christof Rezk-salama, Christian Eckstein, Kai Hormann, Günther Greiner
This paper presents an application for semiautomatic repositioning of bone fractures that allows the merging of several fragments. This application has been developed with regard to orthopaedic...
Adaptive lumigraph rendering with depth maps (2000)
Christian Vogelgsang, Günther Greiner
The quality of standard two plane parameterized light field rendering can be greatly improved by introducing a coarse geometric model of the scene which can be used to correct the interpolation...
Hierarchical Tetrahedral-Octahedral Subdivision for Volume Visualization (2000)
Roberto Grosso, Günther Greiner
We present a method for discretizing 3D-space in order to make it accessible for handling numerical problems, e.g. for simulation or visualization. Our algorithm generates a hierarchy of 3D meshes....
Automatic Adjustment of Transfer Functions for 3D Volume Visualization (2000)
Christof Rezk-salama, Peter Hastreiter, Jörg Scherer, Günther Greiner
In most volume rendering scenarios implicit classification is performed manually by specification data values to visual attributes. An appropriate classification requires both specialized knowledge...
Hierarchical Meshes for Volume Data (1998)
Roberto Grosso, Günther Greiner
An algorithm for adaptive refinement of 3D-meshes is outlined. This algorithm is very convenient for the generation of mesh hierarchies used for efficient volume visualization algorithms, e.g....
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...
Interpolating and Approximating Scattered 3D-data with Hierarchical Tensor Product B-Splines (1997)
. In this note we describe surface reconstruction algorithms based on optimization techniques. The input are scattered 3D-data with specified topology. The surfaces constructed are tensor product...
An object-oriented approach to curves and surfaces (1996)
Reinhard Klein, Andreas Kolb, Günther Greiner
Applications in computer graphics and geometric modeling generally require the integration of a variety of curve and surface types into a single system. Object-oriented design offers the opportunity...
Scattered Data Interpolation Using Data Dependent Optimization Techniques (1995)
Günther Greiner, Andreas Kolb, Angela Riepl
Interpolation of scattered data has many applications in different areas. Recently, this problem has gained a lot of interest for CAD applications, in combination with the process of "reverse...
Surface Construction Based on Variational Principles (1994)
. Variational principles have become quite popular in the design of surfaces. The idea is to consider a class of surfaces having more degrees of freedom than are necessary to fulfill the constraints...
Blending Surfaces with Minimal Curvature (1994)
this paper we describe in detail the method for constructing blending surfaces. These surfaces are needed to construct a smooth transition between two primary Figure 1: surfaces or to close a hole in...
Modeling with Triangular B-Splines (1993)
Günther Greiner, Hans-peter Seidel
Triangular B-splines are a new tool for the modeling of complex objects with non-rectangular topology. The new B-spline scheme is based on blending functions and control points and allows modeling...
Curvature Continuous Blend Surfaces (1993)
Günther Greiner, Hans-Peter Seidel
. We describe a method to generate blend surfaces which fit with continuous curvature to the primary surfaces. This blend surface is obtained as the bicubic tensor spline minimizing a variational...