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Work distribution for parallel ZSweep algorithm 16

Work distribution for parallel ZSweep algorithm

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16th Brazilian symposium on Computer graphics and Image Processing

作者： Farias, R Bentes, C Coelho, A Guedes, S Gonçalves, L Natl Lab Sci Comp LNCC Petropolis RJ Brazil

ISBN: (纸本)0769520324

Distributed systems such as clusters of PCs are low-cost alternatives for running parallel rendering systems, but they have high communication overhead, and limited memory capacity on each processing node. In this paper, we focus on the strategy for distributing the parallel rendering work among the PCs. A good distribution strategy provides better load balance, and avoids the need for replicating data on the relatively small memory of each PC. Our goal is to study different distribution strategies on the scope of the parallel ZSweep algorithm, introducing in PZSweep another work distribution strategy: work stealing. This strategy allows a decentralized control of the work to be done, and provides a dynamic load redistribution. We propose two different algorithms to select the processor that will be "stolen" and show that the simplest one, nearest neighbor, was the most efficient. We also showed that the load redistribution schemes strongly depended on the initial load distribution, with an interleaved assignment, our systems could outperform the original parallel ZSweep algorithm. We conclude that for running large datasets on a cluster of PCs, parallel ZSweep requires dynamic load distribution strategy.

关键词： Automation Clustering algorithms Costs Distributed control Distribution strategy Laboratories Nearest neighbor searches Personal communication networks Scientific computing Systems engineering and theory

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Accuracy-based sampling and reconstruction with adaptive grid for parallel hierarchical tetrahedrization 03

Accuracy-based sampling and reconstruction with adaptive gri...

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2003 Eurographics/ieee TVCG Workshop on Volume graphics, VG '03

作者： Tanaka, Hiromi T. Takama, Yasufumi Wakabayashi, Hiroki Computer Vision Laboratory Department of Computer Science Ritsumeikan University Noji-Higashi 1chome 1-1 Kusatsu Shiga 525-8577 Japan

ISBN: (纸本)1581137451

Recent advances in volume scanning techniques have made the task of acquiring volume data of 3-D objects easier and more accurate. Since the quantity of such acquired data is generally very large, a volume model capable of compressing data while maintaining a specified accuracy is required. The objective of this work is to construct a multi resolution tetrahedra representation of input volume data. This representation adapts to local field properties while preserving their discontinuities. In this paper, we present an accuracy-based adaptive sampling and reconstruction technique, we call an adaptive grid, for hierarchical tetrahedrization of C1 continuous volume data. We have developed a parallel algorithm of adaptive grid generation that recursively bisects tetrahedra gird elements by increasing the number of grid nodes, according to local field properties and such as orientation and curvature of isosurfaces, until the entire volume has been approximated within a specified level of view-invariant accuracy. We have also developed a parallel algorithm that detects and preserves both C0 and C1 discontinuities of field values, without the formation of cracks which normally occur during independent subdivision. Experimental results demonstrate the validity and effusiveness of the proposed approach. © The Eurographics Association 2003.

关键词： parallel algorithms

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Efficient visualization of large medical image datasets on standard pc hardware

Efficient visualization of large medical image datasets on s...

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5th Joint Eurographics - ieee TCVG symposium on visualization, VisSym 2003

作者： Pekar, V. Hempel, D. Kiefer, G. Busch, M. Weese, J. Philips Research Laboratories Hamburg Germany Aachen Germany

ISBN: (纸本)3905673010

Fast and accurate algorithms for medical image processing and visualization are becoming increasingly important due to routine acquisition and processing of rapidly growing amounts of data in clinical practice. At the same time, standard computer hardware is becoming suf_ciently powerful to be used in applications which previously required expensive and infiexible special-purpose hardware. We present an efficient volume rendering approach using the example of maximum intensity projection (MIP), which is an important clinical tool. The method systematically exploits the properties of general-purpose hardware such as hierarchical cache memories and superscalar processing. In order to optimize the cache efficiency, the dataset is processed in blocks which fit into the processor cache. The innermost ray casting loop is transformed such that the arithmetic operations and memory accesses can be processed in parallel on current general-purpose processors. Combined with other optimization strategies, such as vectorization and block-wise ray skipping, this approach yields near-interactive frame rates for large clinical datasets using a standard dual-processor PC. data compression and simplification methods have intentionally not been used in order to demonstrate the achievable performance without any quality reductions. Some of the presented ideas can be applied to other computationally intensive image processing tasks. © 2003 Eurographics Association. All rights reserved.

关键词： Volume rendering

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Study and implementation on parallel processing algorithm for DEPS

Study and implementation on parallel processing algorithm fo...

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ieee International symposium on Geoscience and Remote Sensing (IGARSS)

作者： Lingfeng Zhu Yun Shao Xiangtao Fan Huadong Guo Laboratory of Digital Earth Sciences Institute of Remote Sensing Applications Chinese Academy and Sciences Beijing China

ISBN: (纸本)0780379292

A study on efficient visualization and real-time interactivity of large-scale scenes is discussed. Introducing parallel processing technology, we present a parallelizable strategy with the pipeline algorithm, realize this parallel algorithm based on shared-memory, and then apply this program to a test site, the Peking Olympic Games planning mixed scenes, including real-time rendering, dynamical texture loading, quick browsing and so on. The results show a running performance and real-time interactivity improvement of DEPS (Digital Earth Prototype System) when using this algorithm. The parallel program of this paper was developed and running on a Silicon graphics multiprocessor, Onyx 3200, with four MIPS R12000 processors and InfiniteReality 3 graphic accelerator, under IRIX 6.5 operating system.

关键词： parallel processing Layout graphics visualization large-scale systems Pipelines parallel algorithms Testing Process planning Strategic planning

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visualization of large-scale customer satisfaction surveys using a parallel coordinate tree

Visualization of large-scale customer satisfaction surveys u...

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ieee symposium on Information visualization (INFOVIS)

作者： D. Brodbeck L. Girardin Macrofocus GmbH

Satisfaction surveys are an important measurement tool in fields such as market research or human resources management. Serious studies consist of numerous questions and contain answers from large population samples. Aggregation on both sides, the questions asked as well as the answers received, turns the multidimensional problem into a complex system of interleaved hierarchies. Traditional ways of presenting the results are limited to one-dimensional charts and cross-tables. We developed a visualization method called the parallel Coordinate Tree that combines multidimensional analysis with a tree structure representation. Distortion-oriented focus+context techniques are used to facilitate interaction with the visualization. In this paper we present a design study of a commercial application that we built, using this method to analyze and communicate results from large-scale customer satisfaction surveys.

关键词： large-scale systems Customer satisfaction data visualization Encoding USA Councils Vehicles Quality management Demography Government Rail transportation

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Visibility culling using plenoptic opacity functions for large volume visualization

Visibility culling using plenoptic opacity functions for lar...

引用

ieee Conference on visualization

作者： Jinzhu Gao Jian Huang Han-Wei Shen J.A. Kohl Ohio State Uinversity USA University of Tennessee USA Oak Ridge National Laboratory USA

Visibility culling has the potential to accelerate large data visualization in significant ways. Unfortunately, existing algorithms do not scale well when parallelized, and require full re-computation whenever the opacity transfer function is modified. To address these issues, we have designed a Plenoptic Opacity Function (POF) scheme to encode the view-dependent opacity of a volume block. POFs are computed off-line during a pre-processing stage, only once for each block. We show that using POFs is (i) an efficient, conservative and effective way to encode the opacity variations of a volume block for a range of views, (ii) flexible for re-use by a family of opacity transfer functions without the need for additional off-line processing, and (iii) highly scalable for use in massively parallel implementations. Our results confirm the efficacy of POFs for visibility culling in large-scale parallel volume rendering; we can interactively render the Visible Woman dataset using software ray-casting on 32 processors, with interactive modification of the opacity transfer function on-the-fly.

关键词： data visualization Transfer functions Computer graphics Electronic mail Acceleration large-scale systems Rendering (computer graphics) Computer networks Chromium Medical services

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Exploding the frame: designing for wall-size computer displays

Exploding the frame: designing for wall-size computer displa...

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ieee symposium on Information visualization (INFOVIS)

作者： B. Shedd Princeton University Shedd Productions Inc. USA

High-resolution wall-size digital displays present significant new and different visual space to show and see imagery. The author has been working with two wall-size digital displays at Princeton University for five years and directing and producing IMAX films for a decade, and he has noted some unique design considerations for creating effective visual images when they are spread across entire walls. The author suggests these "frameless" screens - where images are so large we need to look around to see the entire field - need different ways of thinking about image design and visualization. Presenting such things as scale and detail take on new meaning when they can be displayed life-size and not shown in the context of one or many small frames such as we see everywhere. These design ideas will be of use for pervasive computing, interface research and design, interactive design, control design, representations of massive data sets, and creating effective displays of data for research and education.

关键词： Computer displays Production Education large screen displays Pervasive computing Control design graphics data visualization Educational institutions Computer science

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Smooth and efficient zooming and panning

Smooth and efficient zooming and panning

引用

ieee symposium on Information visualization (INFOVIS)

作者： J.J. van Wijk W.A.A. Nuij Department of Mathematics and Computer Science Technische Universiteit Eindhoven Netherlands

large 2D information spaces, such as maps, images, or abstract visualizations, require views at various level of detail: close ups to inspect details, overviews to maintain (literally) an overview. Users often switch between these views. We discuss how smooth animations from one view to another can be defined. To this end, a metric on the effect of simultaneous zooming and panning is defined, based on an estimate of the perceived velocity. Optimal is defined as smooth and efficient. Given the metric, these terms can be translated into a computational model, which is used to calculate an analytic solution for optimal animations. The model has two free parameters: animation speed and zoom/pan trade off. A user experiment to find good values for these is described.

关键词： Animation data visualization Switches Computational modeling Navigation Cities and towns Uninterruptible power systems Chromium Computer graphics Software engineering

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Intelligently resolving point occlusion

Intelligently resolving point occlusion

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ieee symposium on Information visualization (INFOVIS)

作者： M. Trutschl G. Grinstein U. Cvek LSU Computer Science LSU Health Sciences Center Shreveport LA USA Computer Science Department University of Massachusetts Lowell MA USA

large and high-dimensional data sets mapped to low-dimensional visualizations often result in perceptual ambiguities. One such ambiguity is overlap or occlusion that occurs when the number of records exceeds the number of unique locations in the presentation or when there exist two or more records that map to the same location. To lessen the affect of occlusion, non-standard visual attributes (i.e. shading and/or transparency) are applied, or such records may be remapped to a corresponding jittered location. The resulting mapping efficiently portrays the crowding of records but fails to provide the insight into the relationship between the neighboring records. We introduce a new interactive technique that intelligibly organizes overlapped points, a neural network-based smart jittering algorithm. We demonstrate this technique on a scatter plot, the most widely used visualization. The algorithm can be applied to other one, two, and multi-dimensional visualizations which represent data as points, including 3-dimensional scatter plots, RadViz, polar coordinates.

关键词： data visualization Computer science Scattering Displays Computer graphics Artificial neural networks Neural networks Multidimensional systems Chromium User interfaces

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Study on real-time simulation technology of large-scale virtual scene

Study on real-time simulation technology of large-scale virt...

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ieee International symposium on Geoscience and Remote Sensing (IGARSS)

作者： Lingfeng Zhu Yun Shao Xiangtao Fan Huadong Guo Laboratory of Digital Earth Sciences Institute of Remote Sensing Applications Chinese Academy and Sciences Beijing China

ISBN: (纸本)0780379292

Real-time simulation technologies of a large-scale virtual scene are studied. Besides the building of LOD models (including terrain and cultural features) based on a viewpoint in the Peking Olympic Games Planning Regions as a demonstration area, we adopt Active Surface Definition, a real-time framework, to manage the terrain data, apply ClipTexture to manage the high-resolution textures efficiently, and utilize parallel processing technology to deploy the scene data dynamically, which result in higher fidelity and better simulation effects in the virtual scene we finally build up.

关键词： large-scale systems Layout Tiles Technology management parallel processing graphics Cultural differences Surface texture Real time systems Application software

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