This paper deals with parallelization and implementation aspects of partial differential equation (PDE)-based image processing models for large cluster environments with distributed memory As an example we focus on nonlinear diffusion filtering which we discretize by means of an additive operator splitting (AOS) We start by decomposing the algorithm into small modules that shall be parallelized separately For this purpose image partitioning strategies are discussed and their impact on the communication pattern and volume is analyzed Based on the results we develop an algorithmic implementation with excellent scaling properties on massively connected low-latency networks Test runs on two different high-end Myrinet clusters yield almost linear speedup factors up to 209 for 256 processors This results in typical denoising times of 04 s for five iterations on a 256×256×128 data cube

/pdf/high-performance-cluster-computing-with-3-d-nonlinear-41uht17y26.pdf

High performance cluster computing with 3-D nonlinear diffusion filters

With increasing amount of trajectory dataset being generated and collected, trajectory data has become a ubiquitous type of data important in many different application domains. Research challenges faced are to analyse and retrieve useful higher order information from trajectory datasets to deal with dynamic and “what-if” complex decision making problems. In this paper, we propose a new visualisation approach and quantitative metrics to model and analyse topological higher order information from trajectory datasets. The proposed higher order DNA chart can help decision makers to compare different topological higher order information from different trajectories. We also define higher order trajectory area that models a geometrical area representing the same higher order information. We introduce a higher order DNA impact factor that defines top-k higher order information, and the relationship between trajectory datasets and points-of-interest. A case study using trajectory data extracted from Flickr illustrates the applicability and usefulness of these proposed visual tools and metrics.

DNA-chart visual tool for topological higher order information from spatio-temporal trajectory dataset

We describe a novel approach to visualize bibliographic networks that facilitates the simultaneous identification of clusters (e.g., topic areas) and prominent entities (e.g., surveys or landmark papers). While employing the landscape metaphor proposed in several earlier works, we introduce new means to determine relevant parameters of the landscape. Moreover, we are able to compute prominent entities, clustering of entities, and the landscape's surface in a surprisingly simple and uniform way. The effectiveness of our network visualizations is illustrated on data from the graph drawing literature.

/pdf/visualization-of-bibliographic-networks-with-a-reshaped-2l5sq9t4ve.pdf

Visualization of bibliographic networks with a reshaped landscape metaphor

Invited Speaker.- Visualization of Geoscience Data.- A Case Study in Multi-Sensory Investigation of Geoscientific Data.- Acquisition and Display of Real-Time Atmospheric Data on Terrain.- Multi-Resolution and Adaptive Techniques.- Extraction of Crack-free Isosurfaces from Adaptive Mesh Refinement Data.- Fast Multiresolution Extraction of Multiple Transparent Isosurfaces.- Multiresolution Maximum Intensity Volume Rendering by Morphological Pyramids.- Unstructured Data, Multi-Scale and Visibility.- Subdivision Surfaces for Scattered-data Approximation.- The Rendering of Unstructured Grids Revisited.- Nonlinear Diffusion in Graphics Hardware.- Voxel Column Culling: Occlusion Culling for Large Terrain Models.- Flow Visualization.- Stream Surface Generation for Fluid Flow Solutions on Curvilinear Grids.- Vector and Tensor Field Topology Simplification on Irregular Grids.- Topology-Based Visualization of Time-Dependent 2D Vector Fields.- Biomedical Applications.- Virtual Colon Flattening.- Improved visualization in virtual colonoscopy using image-based rendering.- Three-dimensional Reconstruction and Visualization of the Cerebral Cortex in Primates.- Interactive and Multi-modal Visualization for Neuroendoscopic Interventions.- Information Visualization.- Visualization of Generalized Voronoi Diagrams.- Preserving the Mental Map using Foresighted Layout.- Visualization of Directed Associations in E-Commerce Transaction Data.- Object Representation.- Space-Efficient Boundary Representation of Volumetric Objects.- Salient Representation of Volume Data.- A Selective Refinement Approach for Computing the Distance Functions of Curves.- Progressive View-Dependent Isosurface Propagation.- Volume Rendering.- A Hardware-Assisted Visibility-Ordering Algorithm With Applications To Volume Rendering.- Volume Rendering Data with Uncertainty Information.- Adaptive Volume Rendering using Fuzzy Logic Control.- I/O-Conscious Volume Rendering.- Information Visualization Applications.- Interacting with Stock Market Data in a Virtual Environment.- Case Study: Visualization and Information Retrieval Techniques for Network Intrusion Detection.- DDDiver: 3D Interactive Visualization of Entity Relationships.- Automotive Applications.- Visualization of Thermal Flows in an Automotive Cabin with Volume Rendering Method.- Automotive Soiling Simulation Based On Massive Particle Tracing.- Comparative Visualization of Instabilities in Crash-Worthiness Simulations.- Authors Index.- Color Plates.

Data visualization 2001 : Proceedings of the joint Eurographics - IEEE TCVG Symposium on Visualization in Ascona, Switzerland, May 28-30, 2001

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Data visualization 2001 : Proceedings of the joint Eurographics - IEEE TCVG Symposium on Visualization in Ascona, Switzerland, May 28-30, 2001