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检索条件"机构=Center for Image Processing and Integrated Computing Department of Computer Science"

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

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

引用

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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Wavelet representation of contour sets 01

Wavelet representation of contour sets

引用

IEEE Conference on Visualization

作者： M. Bertram D.E. Laney M.A. Duchaineau C.D. Hansen B. Hamann K.I. Joy Department of Computer Science University of Kaiserslautern Kaiserslautern Germany SCI Institute University of Utah Salt Lake UT USA Center for Applied Scientific Computing CASC Lawrence Livemore National Laboratory Livermore CA USA Center for Image Processing and Integrated Computing CIPIC Department of Computer Science University of California Davis CA USA

ISBN: (纸本)0780372018

We present a new wavelet compression and multiresolution modeling approach for sets of contours (level sets). In contrast to previous wavelet schemes, our algorithm creates a parametrization of a scalar field induced by its contours and compactly stores this parametrization rather than function values sampled on a regular grid. Our representation is based on hierarchical polygon meshes with subdivision connectivity whose vertices are transformed into wavelet coefficients. From this sparse set of coefficients, every set of contours can be efficiently reconstructed at multiple levels of resolution. When applying lossy compression, introducing high quantization errors, our method preserves contour topology, in contrast to compression methods applied to the corresponding field function. We provide numerical results for scalar fields defined on planar domains. Our approach generalizes to volumetric domains, time-varying contours, and level sets of vector fields.

关键词： image coding Data visualization image reconstruction Wavelet coefficients Topology Isosurfaces Data mining Solid modeling Wavelet transforms Quantization

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Using isosurface methods for visualizing the envelope of a swept trivariate solid

Using isosurface methods for visualizing the envelope of a s...

引用

Pacific Conference on computer Graphics and Applications

作者： J. Conkey K.I. Joy Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis USA

We present a method for calculating the envelope surface of a parametric solid object swept along a path in three-dimensional space. The boundary surface of the solid is the combination of parametric surfaces and an implicit surface where the Jacobian of the defining function has a rank deficiency condition. Using this condition, we determine a set of square sub-Jacobian determinants that must all vanish simultaneously on the implicit surface. When the generator of the swept surface is a trivariate tensor-product B-spline solid and the path is a B-spline curve, we can give a robust algorithm to determine the implicit surface. This algorithm is based upon the "marching tetrahedra" method, which is adapted to work on 4-simplices. The envelope of the swept solid is given by the union of the parametric and implicit surfaces.

关键词： Isosurfaces Visualization Spline Jacobian matrices Robustness image processing computer science Testing Solid modeling

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Reconstruction of B-spline surfaces from scattered data points

Reconstruction of B-spline surfaces from scattered data poin...

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computer Graphics International

作者： B.F. Gregorski B. Hamann K.I. Joy Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA

We present a new approach for reconstructing a smooth surface from a set of scattered points in 3D space. Our algorithm first decomposes a given point set into a quadtree-like data structure known as a strip tree. The strip tree is used to fit a set of least squares quadratic surfaces to the data points. These quadratic surfaces are then degree-elevated to bi-cubic surfaces and blended together to form a set of B-spline surfaces that approximates the given point set.

关键词： Spline Surface reconstruction Scattering Surface fitting Strips Least squares approximation Tree data structures Design automation image reconstruction Tree graphs

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Multiresolution techniques for interactive texture-based rendering of arbitrarily oriented cutting planes

Multiresolution techniques for interactive texture-based ren...

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2nd Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 2000

作者： LaMar, Eric Duchaineau, Mark A. Hamann, Bernd Joy, Kenneth I. Center for Image Processing and Integrated Computing Department of Computer Science University of California DavisCA95616-8562 United States Center for Applied Scientific Computing Lawrence Livermore National Laboratory Box 808 L-561 LivermoreCA94551 United States

ISBN: (纸本)3211835156

We present a multiresolution technique for interactive texture based rendering of arbitrarily oriented cutting planes for very large data sets. This method uses an adaptive scheme that renders the data along a cutting plane at different resolutions: higher resolution near the point-of-interest and lower resolution away from the point-of-interest. The algorithm is based on the segmentation of texture space into an octree, where the leaves of the tree define the original data and the internal nodes define lower-resolution versions. Rendering is done adaptively by selecting high-resolution cells close to a center of attention and low-resolution cells away from it. We limit the artifacts introduced by this method by blending between different levels of resolution to produce a smooth image. This technique can be used to produce viewpoint-dependent renderings. © 2000 Eurographics Association. All rights reserved.

关键词： Trees (mathematics)

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A spreadsheet interface for visualization exploration 00

A spreadsheet interface for visualization exploration

引用

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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Visualizing DIII-D Tokamak magnetic field lines

Visualizing DIII-D Tokamak magnetic field lines

引用

IEEE Conference on Visualization

作者： G. Schussman Kwan-Liu Ma D. Schissel T. Evans Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA General Atomics Court San Diego CA USA

We demonstrate the use of a combination of perceptually effective techniques for visualizing magnetic field data from the DIII-D Tokamak. These techniques can be implemented to run very efficiently on machines with hardware support for OpenGL. Interactive speeds facilitate clear communication of magnetic field structure, enhancing fusion scientists' understanding of their data, and thereby accelerating their research.

关键词： Tokamaks Magnetic fields Plasma confinement Data visualization Plasma sources Magnetic confinement Physics Data analysis Toroidal magnetic fields Hardware

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Visualizing DIII-D Tokamak magnetic field lines 00

Visualizing DIII-D Tokamak magnetic field lines

引用

Proceedings of the conference on Visualization '00

作者： Greg Schussman Kwan-Liu Ma David Schissel Todd Evans Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis CA General Atomics 3550 General Atomics Court San Diego CA

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Constructing material interfaces from data sets with volume-fraction information 00

Constructing material interfaces from data sets with volume-...

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Proceedings of the conference on Visualization '00

作者： Kathleen S. Bonnell Kenneth I. Joy Bernd Hamann Daniel R. Schikore Mark Duchaineau Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis CA Computational Engineering International Morisville NC Center for Advanced Scientific Computing (CASC) Lawrence Livermore National Laboratory Livermore CA

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Bicubic subdivision-surface wavelets for large-scale isosurface representation and visualization 00

Bicubic subdivision-surface wavelets for large-scale isosurf...

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Proceedings of the conference on Visualization '00

作者： Martin Bertram Mark A. Duchaineau Bernd Hamann Kenneth I. Joy Center for Applied Scientific Computing (CASC) Lawrence Livermore National Laboratory P.O. Box 808 L-561 Livermore CA and Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California at Davis Davis CA Center for Applied Scientific Computing (CASC) Lawrence Livermore National Laboratory P.O. Box 808 L-561 Livermore CA Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California at Davis Davis CA

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