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A magnification lens for interactive volume visualization

A magnification lens for interactive volume visualization

引用

Pacific Conference on Computer Graphics and Applications

作者： E. LaMar B. Hamann K.I. Joy Center for Applied Scientific Computing Lawrence Livemore National Laboratory USA Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis USA

Volume visualization of large data sets suffers from the same problem that many other visualization modalities suffer from: either one can visualize the entire data set and lose small details or visualize a small region and lose the context. The authors we present a magnification lens technique for volume visualization. While the notion of a magnification-lens is not new, and other techniques attempt to simulate the physical properties of a magnifying lens, our contribution is in developing a magnification lens that is fast, can be implemented using a fairly small software overhead, and has a natural, intuitive appearance. The issue with magnification lens is the border, or transition region. The lens center and exterior have a constant zoom factor, and are simple to render. It is the border region that blends between the external and interior magnification, and has a nonconstant magnification. We use the "perspective-correct textures" capability, available in most current graphics systems, to produce a lens with a tessellated border region that approximates linear compression with respect to the radius of the magnification lens. We discuss how a "cubic" border can mitigate the discontinuities resulting from the use of a linear function, without significant performance loss. We discuss various issues concerning development of a three-dimensional magnification lens.

关键词： Lenses Data visualization Rendering (computer graphics) Displays Pixel Navigation Scientific computing Laboratories image processing Computer science

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Interactive display of surfaces using subdivision surfaces and wavelets

Interactive display of surfaces using subdivision surfaces a...

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Spring Conference on Computer Graphics

作者： M.A. Duchaineau M. Bertram S. Porumbescu B. Hamann K.I. Joy Center for Applied Scientific Computing Lawrence Livemore National Laboratory Livermore CA USA FB Informatik Universitaet Kaiserslautern Kaiserslautern Germany Center for Image Processing and Integrated Computing Department of Computer Science University of California USA

Complex surfaces and solids are produced by large-scale modeling and simulation activities in a variety of disciplines. Productive interaction with these simulations requires that these surfaces or solids should be viewable at interactive rates - yet many of these surfaces/solids can contain hundreds of millions of polygons/polyhedra. Interactive display of these objects requires compression techniques to minimize storage, and fast view-dependent triangulation techniques to drive the graphics hardware. In this paper, we review recent advances in subdivision-surface wavelet compression and optimization that can be used to provide a framework for both compression and triangulation. These techniques can be used to produce suitable approximations of complex surfaces of arbitrary topology and can be used to determine suitable triangulations for display. The techniques can be used in a variety of applications in computer graphics, computer animation and visualization.

关键词： Solid modeling Large-scale systems Drives Hardware Topology Computer displays Application software Computer graphics Animation Visualization

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A tetrahedra-based stream surface algorithm 01

A tetrahedra-based stream surface algorithm

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IEEE Conference on Visualization

作者： G. Scheuermann T. Bobach H. Hagen K. Mahrous B. Hamann K.I. Joy W. Kollmann Computer Science Department University of Kaiserslautern Kaiserslautern Germany Center for image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis CA Department of mechanaical and Aeronanutical Engineering University of California Davis CA

ISBN: (纸本)0780372018

This paper presents a new algorithm for the calculation of stream surfaces for tetrahedral grids. It propagates the surface through the tetrahedra, one at a time, calculating the intersections with the tetrahedral faces. The method allows us to incorporate topological information from the cells, e.g. critical points. The calculations are based on barycentric coordinates, since this simplifies the theory and the algorithm. The stream surfaces are ruled surfaces inside each cell, and their construction starts with line segments on the faces. Our method supports the analysis of velocity fields resulting from computational fluid dynamics (CFD) simulations.

关键词： Visualization Streaming media Computational fluid dynamics Piecewise linear techniques Computational modeling Analytical models Fluid flow Fluid dynamics Interpolation Error correction

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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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Wavelet representation of contour sets 01

Wavelet representation of contour sets

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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...

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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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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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Reconstruction of B-spline surfaces from scattered data points

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

引用

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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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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Computationally efficient nonlinear edge preserving smoothing of n-D medical images via scale-space fingerprint analysis

Computationally efficient nonlinear edge preserving smoothin...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： B.W. Reutter V.R. Algazi R.H. Huesman Center for Image Processing and Integrated Computing University of California CA USA Center for Functional Imaging Lawrence Berkeley National Laboratory University of California Berkeley CA USA

Nonlinear edge preserving smoothing often is performed prior to medical image segmentation. The goal of the nonlinear smoothing is to improve the accuracy of the segmentation by preserving changes in image intensity at the boundaries of structures of interest, while smoothing random variations due to noise id the interiors of the structures. Methods include median filtering and morphology operations such as gray scale erosion and dilation, as well as spatially varying-smoothing driven by local contrast measures. Rather than irreversibly altering the image data prior to segmentation, the approach described here has the potential to unify nonlinear edge preserving smoothing with segmentation based on differential edge detection at multiple scales. The analysis of n-D image data is decomposed into independent 1-D problems that can be solved quickly. Smoothing in various directions along 1-D profiles through the n-D data is driven by a measure of local structure separation, rather than by a local contrast measure. Isolated edges are preserved independent of their contrast; given an adequate contrast to noise ratio.

关键词： Smoothing methods Biomedical imaging image segmentation image edge detection image analysis USA Councils Filtering Morphology Signal to noise ratio Convolution

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