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Visual clustering in parallel coordinates

COMPUTER graphics FORUM 2008年第3期27卷 1047-1054页

作者： Zhou, Hong Yuan, Xiaoru Qu, Huamin Cui, Weiwei Chen, Baoquan Hong Kong Univ Sci & Technol Dept Comp Sci & Engn Hong Kong Hong Kong Peoples R China Peking Univ Sch EECS Beijing Peoples R China Peking Univ Key Lab Machine Percept Minist Educ Beijing Peoples R China Chinese Acad Sci Shenzhen Inst Adv Technol Beijing 100864 Peoples R China

parallel coordinates have been widely applied to visualize high-dimensional and multivariate data, discerning patterns within the data through visual clustering. However, the effectiveness of this technique on large data is reduced by edge clutter In this paper, we present a novel framework to reduce edge clutter, consequently improving the effectiveness of visual clustering. We exploit curved edges and optimize the arrangement of these curved edges by minimizing their curvature and maximizing the parallelism of adjacent edges. The overall visual clustering is improved by adjusting the shape of the edges while keeping their relative order The experiments on several representative datasets demonstrate the effectiveness of our approach.

关键词： parallel coordinates visual clustering multi-variate data visualization clutter reduction

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Volume and Point-Based graphics 2008 - Eurographics / ieee VGTC symposium Proceedings, 7th International symposium on Volume graphics, VG 2008 and 5th symposium on Point-Based graphics, PBG 2008

Volume and Point-Based Graphics 2008 - Eurographics / IEEE V...

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Joint ieee/EG 7th International symposium on Volume graphics, VG 2008 and 5th symposium on Point-Based graphics, PBG 2008

ISBN: (纸本)9783905674125

The proceedings contain 20 papers. The topics discussed include: a graph-based approach to symmetry detection;a survey of methods for moving least squares surfaces;parallel construction of k-nearest neighbor graphs for point clouds;harmonic colormaps for volume visualization;stroke-based transfer function design;on accuracy of marching isosurfacing methods;isosurface ambient occlusion and soft shadows with filterable occlusion maps;multiresolution interval volume meshes;stereo pseudo 3D rendering for web-based display of scientific volumetric data;layers for effective volume rendering;GPU-based particle systems for illustrative volume rendering;interactive global light propagation in direct volume rendering using local piecewise integration;obscurance-based volume rendering framework;decomposition and visualization of fourth-order elastic-plastic tensors;and pseudorandom noise for real-time volumetric rendering of fire in a production system.

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parallel construction of k-nearest neighbor graphs for point clouds

Parallel construction of k-nearest neighbor graphs for point...

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Joint ieee/EG 7th International symposium on Volume graphics, VG 2008 and 5th symposium on Point-Based graphics, PBG 2008

作者： Connor, M. Kumar, P. Department of Computer Science Florida State University United States

ISBN: (纸本)9783905674125

We present a parallel algorithm for k-nearest neighbor graph construction that uses Morton ordering. Experiments show that our approach has the following advantages over existing methods: (1) Faster construction of k-nearest neighbor graphs in practice on multi-core machines. (2) Less space usage. (3) Better cache efficiency. (4) Ability to handle large data sets. (5) Ease of parallelization and implementation. © The Eurographics Association 2008.

关键词： Motion compensation

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ieee Pacific Visualisation symposium 2008, PacificVis - Proceedings

IEEE Pacific Visualisation Symposium 2008, PacificVis - Proc...

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2008 Pacific visualization symposium, PacificVis 2008

ISBN: (纸本)9781424419661

The proceedings contain 29 papers. The topics discussed include: capstone address: visualization of high dimensional data in brain and information sciences;second-order pre-integrated volume rendering;dynamic shader generation for flexible multi-volume visualization;interactive exploration of remote isosurfaces with point-based non-photorealistic rendering;crossing minimization meets simultaneous drawing;effects on crossing angles;visual statistics for collections of clustered graphs;energy-based hierarchical edge clustering of graphs;finite-time transport structures of flow fields;importance-driven particle techniques for flow visualization;illustrative streamline placement visualization;and optimizing parallel performance of streamline visualization for large distributed flow datasets.

关键词： Flow visualization

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Tradeoffs in Designing Accelerator Architectures for Visual Computing 41

Tradeoffs in Designing Accelerator Architectures for Visual ...

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41st Annual ieee/ACM International symposium on Microarchitecture

作者： Mahesri, Aqeel Johnson, Daniel Crago, Neal Patel, Sanjay J. Univ Illinois Dept Elect & Comp Engn Ctr Reliable & High Performance Comp Urbana IL 61801 USA

ISBN: (纸本)9781424428366

visualization, interaction, and simulation (VIS) constitute a class of applications that is growing in importance. This class includes applications such as graphics rendering, video encoding, simulation, and computer vision. These applications are ideally suited for accelerators because of their parallelizability and demand for high throughput. We compile a benchmark suite, VISBench, to sense as a proxy for this application class. We use VISBench to examine some important high level decisions for all accelerator architecture. We propose a highly parallel base architecture. We examine the need for synchronization and data communication. We also examine GPU-style SIMD execution and find that a MIMD architecture usually performs better. Given these high level choices, we use VISBench to explore the microarchitectural design space. We analyze area versus performance tradeoffs in designing individual cores and the memory hierarchy. We find that a design made of small, sample cores achieves much higher throughput than a general purpose uniprocessor. Further we find that a limited amount of support for ILP within each core aids overall performance. We find that fine-grained multithreading improves performance, but only up to a point. We find that word-level (SSE-style) SIMD provides a poor performance to area ratio. Finally, we find that sufficient memory and cache band-width is essential to performance.

关键词： Accelerator architectures Application software Computational modeling Throughput visualization Computer graphics Rendering (computer graphics) Encoding Computer simulation Computer vision

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Web-Based Distributed Simulations visualization and Control with HLA and Web Services 08

Web-Based Distributed Simulations Visualization and Control ...

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12th ieee/ACM International symposium on Distributed Simulation and Real Time Applications

作者： Boukerche, A. Iwasaki, F. M. Araujo, R. B. Pizzolato, E. B. Univ Ottawa SITE Paradise Lab Ottawa ON Canada Univ Fed Sao Carlos Dept Comp Sci Sao Carlos SP Brazil

ISBN: (纸本)9780769534251

Dynamic Data Driven Application Systems (DDDAS), systems with online simulations models fed with sensorial data from the environment, are increasingly;being used for emergency, management strategic planning. This paper describes an approach to establish the communication and exchange information among the many subsystems composing a DDDAS using the High Level Architecture (HLA) infrastructure's services. We present the LAViE-3D, a framework that generates Web-based simulation front-ends using 3D graphics to manage and control HLA-compliant distributed simulations. The LAViE-3D framework uses open-source software and is designed to make it easier to implement and deploy visualization applications on different platforms with customizable interface for simulations runtime control and management.

关键词： distributed simulations X3D Web services HLA Dynamic Data Driven Application Systems

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Adaptive sampling and rendering of fluids on the GPU

Adaptive sampling and rendering of fluids on the GPU

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Joint ieee/EG 7th International symposium on Volume graphics, VG 2008 and 5th symposium on Point-Based graphics, PBG 2008

作者： Zhang, Yanci Solenthaler, Barbara Pajarola, Renato Visualization and MultiMedia Lab. University of Zürich Switzerland

ISBN: (纸本)9783905674125

In this paper, we propose a novel GPU-friendly algorithm for the Smoothed Particle Hydrodynamics (SPH) simulation for weakly compressible fluids. The major goal of our algorithm is to implement a GPU-based SPH simulation that can simulate and render a large number of particles at interactive speed. Additionally, our algorithm exhibits the following three features. Firstly, our algorithm supports adaptive sampling of the fluids. Particles can be split into several sub-particles in geometrically complex regions to provide a more accurate simulation. At the same time, nearby particles deep inside the fluids are merged to a single particle to reduce the number of particles. Secondly, the fluids are visualized by directly computing the intersection between ray and an isosurface defined by the surface particles. A dynamic particle grouping algorithm and equation solver are employed to quickly find the ray-isosurface intersection. Thirdly, based on the observation that the SPH simulation is a naturally parallel algorithm, the whole SPH simulation, including the adaptive sampling of the fluids as well as surface particle rendering, is executed on the GPU to fully utilize the computational power and parallelism of modern graphics hardware. Our experimental data shows that we can simulate about 50K adaptively sampled particles, or up to 120K particles in the fixed sampling case at a rate of approximately 20 time steps per second. © The Eurographics Association 2008.

关键词： graphics processing unit

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Larrabee: A many-Core x86 architecture for visual computing

Larrabee: A many-Core x86 architecture for visual computing

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ieee Hot Chips symposium (HCS)

作者： Doug Carmean Larrabee Chief Architect Hot Chips 20

This article consists of a collection of slides from the author's conference presentation. Some of the topics discussed include: architecture convergence; Larrabee architecture; and graphics pipeline.

关键词： graphics processing units Computer architecture visualization Rendering (computer graphics) Visual computing Multithreading Central Processing Unit Pipeline processing parallel processing

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Optimizing parallel Performance of Streamline visualization for Large Distributed Flow Datasets

Optimizing Parallel Performance of Streamline Visualization ...

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Pacific (formerly Asia-Pacific APVIS) visualization symposium

作者： Li Chen Issei Fujishiro Tsinghua University Beijing China Institute of Fluid Science University of Tohoku Sendai Japan

parallel performance has been a challenging topic in streamline visualization for large unstructured flow datasets on parallel distributed-memory computers. It depends strongly on domain partitions. Unsuitable partitions often lead to severe load imbalance and high frequent communications among the domain partitions. To address the problem, we present an approach to flow data partitioning taking account of flow directions and features. Multilevel spectral graph bisection method is employed to reduce communication and synchronization overhead among distributed domains. Edge weights in the corresponding adjacent matrix is defined based on an anisotropic local diffusion operator which assigns strong coupling along flow direction and weak coupling orthogonal to flow. Meanwhile, the distributions of seed points and flow features such as vortex structure are also considered in partitioning so as to obtain good load balance. The experimental results are given to show the feasibility and effectiveness of our method.

关键词： Data flow computing Distributed computing Computer graphics Grid computing Data visualization Concurrent computing Anisotropic magnetoresistance Large-scale systems parallel algorithms Streaming media

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Supporting a visualization application on a self-adapting grid middleware

Supporting a visualization application on a self-adapting gr...

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International symposium on parallel and Distributed Processing (IPDPS)

作者： Liang Chen HanWei Shen Gagan Agrawal Department of Computer Science and Engineering Ohio State Uinversity Columbus OH USA

This paper describes how we have used a self-adapting middleware to implement a distributed and adaptive volume rendering application. The middleware we have used is GATES (grid-based adaptive execution on streams), which allows processing of streaming data in a distributed environment. A challenge in supporting such an application on streaming data is to balance the visualization quality and the speed of processing, which can be automatically done by the GATES middleware. We describe how we divide the application into a number of processing stages, and what adaptation parameters we use. Our experimental studies have focused on evaluating the self-adaptation enabled by the middleware, and measuring the overhead associated with the use of middleware.

关键词： Middleware Data visualization Application software Rendering (computer graphics) Iterative algorithms Computer science Large-scale systems Surgical instruments Surgery Image quality

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