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Scalable High Performance Computing Conference

作者： R.J. Karia Department of Computer Science Australian National University Canberra ACT Australia

A scheme for the visualization of large data volumes using volume rendering on a distributed memory MIMD system is described. The data to be rendered is decomposed into subvolumes to reside in the local memories of the system's nodes. A partial image of the local data is generated at each node by ray tracing, and is then composited with partial images on other nodes in the correct order to generate the complete Image. Subvolumes whose voxels are classified as being mapped to zero opacity are not rendered, giving rise to an imbalance of work amongst nodes. Scattered decomposition is used for load balancing, which on one hand: creates additional overheads in compositing and communication, but on the other, provides an improvement in throughput that is dependent on the characteristics of the data. Experimental results for a typical data set rendered on a 1024-node Fujitsu AP1000 are reported.< >

关键词： Load management Scattering Rendering (computer graphics) data visualization Ray tracing Computer science Application software Casting Throughput Proposals

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A distributed, parallel, interactive volume rendering package 94

A distributed, parallel, interactive volume rendering packag...

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ieee Conference on visualization

作者： J.S. Rowlan G.E. Lent N. Gokhale S. Bradshaw Mathematics Computer Science Division Argonne National Laboratory Argonne IL USA

ISBN: (纸本)9780780325210

This paper presents a parallel ray-casting volume rendering algorithm and its implementation on the massively parallel IBM SP-1 computer using the Chameleon message passing library. Though this algorithm takes advantage of many of the unique features of the SP-1 (e.g. high-speed switch, large memory per node, high-speed disk array, HIPPI display, et al.), the use of Chameleon allows the code to be executed on any collection of workstations. The algorithm is image-ordered and distributes the data and the computational load to individual processors. After the volume data is distributed, all processors then perform local ray tracing of their respective subvolumes concurrently. No interprocess communication takes place during the ray tracing process. After a subimage is generated by each processor, the final image is obtained by composing subimages between all the processors. The program itself is implemented as an interactive process through a GUI residing on a graphics workstation which is coupled to the parallel rendering algorithm via sockets. The paper highlights the Chameleon implementation, the GUI, some optimization improvements, static load balancing, and direct parallel display to a HIPPI framebuffer.< >

关键词： Packaging Switches Workstations Ray tracing Graphical user interfaces Concurrent computing Message passing Libraries Computer displays Distributed computing

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Image reconstruction of radical prostatectomy specimens using a three dimensional reconstruction algorithm

Image reconstruction of radical prostatectomy specimens usin...

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ieee symposium on Nuclear Science (NSS/MIC)

作者： P.N. Werahera G.D. Taylor T. Brubaker G.J. Miller F. Daneshgari E.D. Crawford Division of Urology University of Colorado Health Sciences Center Denver CO USA Department of Mathematics Colorado State University Fort Collins CO USA Department of Electrical Engineering Colorado State University Fort Collins CO USA Pathology Department University of Colorado Health Sciences Center Denver CO USA

Describes a three dimensional reconstruction algorithm that utilizes both interpolation and extrapolation techniques to reconstruct an object from parallel planar cross sectional data sets encoded via quadtree data structures. This algorithm has been validated by comparing the volume and shape of the original object against the volume and shape of the reconstructed object. The results (volume and shape) are presented for objects of known geometrical shapes reconstructed using this algorithm. Further, results are presented for small and large wax models with shapes that are found in prostatic carcinoma. Finally, the authors present the results obtained from this algorithm by reconstructing real prostate glands using histologic maps obtained from whole-mount sections.< >

关键词： Image reconstruction Reconstruction algorithms Shape Interpolation Glands Rough surfaces Surface roughness Surface reconstruction Extrapolation visualization

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A visualization Model for Supercomputing Environments

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ieee parallel & Distributed Technology: Systems & Applications 1993年第4期1卷 16-22页

作者： Pavlakos, Constantine J. Schoof, Larry A. Mareda, John F. Sandia National Laboratories United States

Sandia's visualization environment integrates a supercomputer, large storage facilities, and a visualization server to let scientists analyze large, complex problems and view pseudo-high-performance, interactive g... 详细信息

关键词： data visualization Visual databases Supercomputers graphics Rendering (computer graphics) Workstations Acceleration Displays Computational fluid dynamics data analysis

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Cosmic Explorer: A virtual reality environment for exploring cosmic data

Cosmic Explorer: A virtual reality environment for exploring...

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1993 ieee Research Properties in Virtual Reality symposium, VRAIS 1993

作者： Song, D. Norman, M.L. Nat. Center for Supercomput. Applications 605 E. Springfield Ave. ChampaignIL61820 United States

ISBN: (纸本)0818649100

Supercomputer simulations now can produce multilevel, multi-scale large data sets that require new techniques in scientific visualization and higher levels of hardware performance. The authors explore the use virtual reality (VR) technology in this connection. Cosmic Explorer is a VR environment visualizing numerical and observational cosmology data. They have implemented multi-scale visualization techniques that will work on large, multilevel time-dependent data sets. VR provides natural ways to navigate in an immersive environment, and scientific visualization requires overviewing. The techniques bridge the two in a VR system involving the BOOM and the dataGlove. Combining modern visualization hardware, software, and VR technology, the authors are able to create a system that lets users explore the virtual space created by numerical simulations with ease and naturalness. © 1993 ieee.

关键词： data visualization

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Pyramid-based approach to interactive terrain visualization

Pyramid-based approach to interactive terrain visualization

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Proceedings of the 1993 parallel Rendering symposium

作者： Kaba, James Peters, Joseph Natl Information Display Lab Princeton United States

ISBN: (纸本)0818649208

This paper describes a multiresolution approach to the visualization of surface data. The algorithms discussed allow the generation of arbitrary views of 3-dimensional surfaces. Image processing and texture mapping techniques are combined in a new 3-pass scanline algorithm to achieve smooth and continuous translations, rotations and scale changes of large data sets. The implementations of the algorithms on a massively parallel SIMD video supercomputer, the Princeton Engine, allows the scenes to be generated interactively at video rates.

关键词： Image processing

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Advanced methods of performance data processing and analysis 7

Advanced methods of performance data processing and analysis

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7th International parallel Processing symposium, IPPS 1993

作者： Rover, D.T. Waheed, A. Doetsch, M. Dept. of Electr. Eng. Michigan State Univ. East LansingMI48824 United States

ISBN: (纸本)0818634421

The analysis of program performance on massively parallel (MPP) systems is a non-trivial task which is increasingly performed using visualization tools. Conventional processing, analysis, and display methods typically do not adequately support the evaluation of program performance on large-scale parallel systems. These methods can be limited by the sheer volume of performance data and often lack any rigorous approach to analyze it. The objective of the approach outlined is to develop a more powerful method to analyze performance data visually as well as statistically which is scalable and extensible and which represents some physical and/or logical structure of the parallel system state. The approach focuses on applying image processing and analysis techniques to MPP performance analysis. This approach has been prototyped and tested for proof-of-concept. The AVS scientific visualization tool is used to analyze and display images of performance data from program executions on actual machines. Results of these experiments are presented. © 1993 ieee.

关键词： data visualization

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A pyramid-based approach to interactive terrain visualization

A pyramid-based approach to interactive terrain visualizatio...

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parallel Rendering symposium

作者： J. Kaba J. Peters National Information Display Laboratory David Samoff Research Center Inc. Princeton NJ USA

This paper describes a multiresolution approach to the visualization of surface data. The algorithms discussed allow the generation of arbitrary views of 3-dimensional surfaces. Image processing and texture mapping techniques are combined in a new 3-pass scanline algorithm to achieve smooth and continuous translations, rotations, and scale changes of large data sets. The implementation of the algorithms on a massively parallel SIMD video supercomputer, the Princeton Engine, allows the scenes to be generated interactively at video rates.

关键词： Rendering (computer graphics) data visualization Terrain mapping Layout Displays Engines Supercomputers Level measurement Laboratories Image processing

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parallel volume rendering and data coherence

Parallel volume rendering and data coherence

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parallel Rendering symposium

作者： B. Corrie P. Mackerras Department of Computer Science Australian National University Canberra ACT Australia

The two key issues in implementing a parallel ray-casting volume renderer are the work distribution and the data distribution. We have implemented such a renderer on the Fujitsu AP1000 using an adaptive image-space subdivision algorithm based on the worker-farm paradigm for the work distribution, and a distributed virtual memory, implemented in software, to provide the data distribution. Measurements show that this scheme works efficiently and effectively utilizes the data coherence that is inherent in volume data.

关键词： Rendering (computer graphics) Computer architecture Computer graphics Ray tracing data visualization Concurrent computing Distributed computing Communication system control Throughput Computer science

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Integrating volume data analysis and rendering on distributed memory architectures

Integrating volume data analysis and rendering on distribute...

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parallel Rendering symposium

作者： E. Camahort I. Chakravarty ABB HV Switchgear AB Austin TX USA AB Volvo Austin TX USA

The ability to generate visual representations of data, and the ability to enhance data into a suitable form for the purpose of visual representation, form two key components in a scientific visualization system. By a visual representation we mean the ability to render the data, using visual cues, such that the important features are readily perceived by the user. By the ability to enhance data we mean the ability to apply transformations to the data so that salient features embedded in the data become discernible and quantifiable. The rendering of data, computer graphics, and the enhancement of data, image processing, have emerged over the last twenty years into separate scientific disciplines. However, in scientific visualization and other applications of empirical data interpretation, we are increasingly confronted with the need to combine both data rendering and data transformation capabilities under one system framework. This paper describes the design issues and implementation of a program for visualizing and enhancing volume data on distributed memory architectures. Our design is motivated by the desire to interactively view, transform, and interpret volume data acquired using seismic imaging techniques. Experimental results derived from an implementation on the Connection Machine CM-5 are described.

关键词： data analysis Memory architecture data visualization Rendering (computer graphics) Biomedical imaging Computer graphics Numerical simulation Microwave integrated circuits Computer architecture Laboratories

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