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10th International Conference on Discrete Geometry for computer Imagery, DGCI 2002

作者： Thürmer, Grit Computer Graphics Visualization Man-Machine Communication Group Bauhaus-University Weimar Weimar99421 Germany

ISBN: (纸本)3540433805

A new definition of closed curves in n-dimensional discrete space is proposed. This definition can be viewed as a generalization of closed quasi curves and is intended to overcome the limitations of known definitions for practical purposes. Following the proposed definition, a set of points forms a closed curve in discrete space if the set admits a parameterization, i.e. there exists a Hamiltonian cycle in the set. Adjacencies that do not indicate the parameterization are allowed only between points that are "close to each other" along the parameterization. Additionally, it is proven that discrete curves satisfying the new definition in two-dimensional discrete space have the Jordan property. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Parameterization

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A model for the visualization exploration process

A model for the visualization exploration process

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VIS 2002, IEEE Visualisation 2002

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Gertz, Michael Visualization and Graphics Res. Grp. Center for IPIC University of California Davis CA 95616 United States Database and Information Syst. Group Computer Science Department University of California Davis CA 95616 United States

The current state of the art in visualization research places a strong emphasis on different techniques to derive insight from disparate types of data. However, little work has investigated the visualization process itself. The information content of the visualization process-the results, history, and relationships between those results-is addressed by this work. A characterization of the visualization process is discussed, leading to a general model of the visualization exploration process. The model, based upon a new parameter derivation calculus, can be used for automated reporting, analysis, or visualized directly. An XML-based language for expressing visualization sessions using the model is also described. These sessions can then be shared and reused by collaborators. The model, along with the XML representation, provides an effective means to utilize the information within the visualization process to further data exploration.

关键词： visualization

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A Study of Transfer Function Generation for Time-Varying Volume Data 2

A Study of Transfer Function Generation for Time-Varying Vol...

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2nd IEEE TCVG / Eurographics International Workshop on Volume graphics, VG 2001

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Visualization And Graphics Research Group Center For Image Processing And Integrated Computing University Of California Department Of Computer Science DavisCA95616 United States

ISBN: (纸本)321183737X

The proper usage and creation of transfer functions for time-varying data sets is an often ignored problem in volume visualization. Although methods and guidelines exist for time-invariant data, little formal study for the timevarying case has been performed. This paper examines this problem, and reports the study that we have conducted to determine how the dynamic behavior of time-varying data may be captured by a single or small set of transfer functions. The criteria which dictate when more than one transfer function is needed were also investigated. Four data sets with different temporal characteristics were used for our study. Results obtained using two different classes of methods are discussed, along with lessons learned. These methods, including a new multiresolution opacity map approach, can be used for semi-automatic generation of transfer functions to explore large-scale time-varying data sets. © VG 2001. All rights reserved.

关键词： Transfer functions

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Remote analysis for brain shift compensation 4th

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4th International Conference on Medical Image Computing and computer-Assisted Intervention, MICCAI 2001

作者： Hastreiter, P. Engel, K. Soza, G. Bauer, M. Wolf, M. Ganslandt, O. Fahlbusch, R. Greiner, G. Ertl, T. Nimsky, Ch Dept. Of Neurosurgery University of Erlangen-Nuremberg Germany Visualization and Interactive Systems Group University of Stuttgart Germany Computer Graphics Group University of Erlangen-Nuremberg Germany Knowledge Processing Group Bavarian Research Center for Knowledge-Based Systems Germany

ISBN: (纸本)3540426973

The compensation for brain shift is assisted by intraoperative imaging. For the purpose of fast registration and interactive visualization, a framework is presented based on local desktop computers and remote high-end computers with a maximum of compute power and graphics capacity. In this context, functional markers resulting from preoperative measurements (MEG, fMRI) are mapped to the intraoperative situation. Overall, results from 5 cases demonstrate the value of the suggested environment. © Springer-Verlag Berlin Heidelberg 2001.

关键词： visualization

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Real-time out-of-core visualization of particle traces

Real-time out-of-core visualization of particle traces

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IEEE Symposium on Parallel and Large-Data visualization and graphics (PVG)

作者： R. Bruckschen F. Kuester B. Hamann K.I. Joy Visualization and Graphics Research Group Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA Visualization and Interactive Systems Group Department of Electrical and Computer Engineering University of California Irvine CA USA

ISBN: (纸本)0780372239

visualization of particle traces provides intuitive and efficient means for the exploration and analysis of complex vector fields. The paper presents a method suitable for the real-time visualization of arbitrarily large time-varying vector fields in virtual environments. We describe an out-of-core scheme in which two distinct pre-processing and rendering components enable real-time data streaming and visualization. The presented approach yields low-latency application start-up times and small memory footprints. The described system was used to implement a "volumetric fog lance," which can emit up to 60000 particles into a flow field while maintaining an interactive frame rate of 60 frames per second. All algorithms were specifically designed to support commodity hardware. The proof-of-concept system is running on a low-cost Linux workstation equipped with a 120 GB E-IDE RAID (redundant array of inexpensive disk) system.

关键词： Data visualization Computational modeling Computational fluid dynamics Motion pictures Hardware computer graphics Interactive systems Image processing computer science Image analysis

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Surface digitizations by dilations which are tunnel-free

Surface digitizations by dilations which are tunnel-free

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9th International Conference on Discrete Geometry for computer Imagery, DGCI 2000

作者： Lincke, Christoph Wüthrich, Charles A. Computer Graphics Visualization Man-Machine Communication Group Faculty of Media Bauhaus University Weimar 99421 Weimar Germany

ISBN: (纸本)3540413960

In this article we study digital topology with methods from mathematical morphology. We introduce reconstructions by dilations with appropriate continuous structural elements and prove that notions known from digital topology can be defined by continuous properties of this reconstruction. As a consequence we determine the domains for tunnel-free surface digitizations. It will be proven that the supercover and the grid-intersection digitization of every surface with or without boundary is always tunnel-free. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Mathematical morphology

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A spreadsheet interface for visualization exploration 00

A spreadsheet interface for visualization exploration

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Proceedings of the conference on visualization '00

作者： T. J. Jankun-Kelly Kwan-Liu Ma Computer Science Department Visualization and Graphics Research Group. Center for Image Processing and Integrated Computing University of California Davis CA

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Determining visible points in a three-dimensional discrete space

Determining visible points in a three-dimensional discrete s...

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9th International Conference on Discrete Geometry for computer Imagery, DGCI 2000

作者： Thürmer, Grit Pousset, Arnault Braquelaire, Achille J.-P. CoGVis/MMC - Computer Graphics Visualization Man-Machine Communication Group Faculty of Media Bauhaus-University Weimar 99421 Weimar Germany LaBRI - Laboratoire Bordelais de Recherche en Informatique UMR 5800 University Bordeaux 1 351 cours de la Libération 33405 Talence France

ISBN: (纸本)3540413960

A method is proposed which computes the visible points of surfaces in a 3-dimensional discrete space. The occlusion of surface points of an object by other object points is determined by shooting a discrete ray from each surface point towards the center of projection considering the intersection of the ray with other object points. Since the projection of points onto the viewing plane is done by a continuous mapping, additionally to the discrete ray, the location of the continuous projection ray is examined regarding its location to the surface points that are intersected by the discrete ray. © Springer-Verlag Berlin Heidelberg 2000.

关键词： computers

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Rhinosurgical therapy planning via endonasal airflow simulation†

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computer Aided Surgery 2000年第3期5卷

作者： Uli Bockholt Dipl.-Math. Gunter Mlynski M.D. Wolfgang Müller Dipl.-Inf. Gerrit Voss Dipl.-Inf. Darmstadt University of Technology Interactive Graphics Systems Group (GRIS) Darmstadt ENT-Clinic Ernst-Moritz-Arndt University Greifswald Greifswald and Fraunhofer Institute for Computer Graphics (Fraunhofer-IGD) Department of Visualization & Virtual Reality Darmstadt Germany

Nowadays, Computational Fluid Dynamics (CFD) methods play an important part in the production process of the automotive industry. Progress in recent years has made possible highly sophisticated airflow-simulation models that are used in engineering for optimization and verification of aerodynamics. The key purpose of the Simulation Tool for Airflow in the human Nose (STAN), developed at the Darmstadt University of Technology in cooperation with the University Hospital in Greifswald, is to use these techniques to support the rhinosurgeon in diagnosis and planning of therapy (Frühauf T, Mlynski G. Simulation and visualization of the air flow in the human nose. Proceedings of the First World Congress on Computational Medicine, Austin, Texas, 1994). A system has been developed that realizes a three-dimensional (3D) reconstruction of the endonasal cavities based on computer tomography (CT) scans. This semiautomatic reconstruction method requires minimal manual intervention. The surface model is used to create an unstructured 3D volume mesh suitable for finite volume simulations. In this way, an individual simulation based on patient-specific data can be realized. At the University Hospital in Greifswald, experimental investigations and measurements are made in nasal models to verify the simulation result. The goal of this project is to investigate individual nasal complaints and to detect respiratory disorders. The surgeon should be able to simulate the disordered respiration before performing a surgical procedure, and thereby increase the effectiveness of surgical planning. Comp Aid Surg 5:175–179 (2000). © 2000 Wiley-Liss, Inc.

关键词： biomechanical simulation computer-aided diagnosis computational biofluids rhinosurgery

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Volume visualization on sparse grids Texture hardware based volume rendering on compressed data sets

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Computing and visualization in Science 1999年第1期2卷 47-59页

作者： Teitzel, Christian Hopf, Matthias Grosso, Roberto Ertl, Thomas Computer Graphics Group University of Erlangen Am Weichselgarten 9 D-91058 Erlangen Germany Visualization and Interactive Systems Group IfI University of Stuttgart Breitwiesenstr. 20-22 D-70565 Stuttgart Germany Siemens AG Werner-von-Siemens-Str. 60 D-91052 Erlangen Germany

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 interest in numerical simulations. Based upon hierarchical tensor product bases, the sparse grid approach is a very efficient one improving the ratio of invested storage and computing time to the achieved accuracy for many problems in the area of numerical solution of partial differential equations, for instance in numerical fluid mechanics. The volume visualization algorithms that are available so far cannot cope with sparse grids. We present an approach that directly works on these grids. As a second aspect in this paper, we suggest to use sparse grids as a data compression method in order to visualize huge data sets even on workstations with low main memory. Since the size of data sets used in numerical simulations is still growing, this feature makes it possible that workstations can continue to handle these data sets. In addition to the standard sparse grid interpolation algorithm and the so-called combination technique, we have developed a new sparse grid interpolation method, which harnesses the texture-mapping hardware of graphics workstations for acceleration purposes. Therefore, hardware based volume rendering becomes possible on compressed data sets at interactive frame rates. This is not possible if other compression methods like wavelet or fractal compression are used. © 1999 Springer-Verlag.

关键词： Volume rendering

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