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9th International Conference on Information Visualisation

作者： Waldeck, C Dept. Z3 (MIV: Mobile Information Visualization) Computer Graphics Center ZGDV Germany ZGDV Computer Graphics Center Dept. Z3 MIV (Mobile Information Visualization) 64283 Darmstadt Fraunhofer Str. 5 Germany

ISBN: (纸本)0769523978

This (video-) paper describes a user interface concept, which facilitates multidimensional visual queries, filtering and browsing of the file system at the same time by means of the "Liquid Scatter Space" (LSS) concept ([1] Waldeck 2004). The UI concept is based on an advanced star field display ([2] Ahlberg & Shneiderman 1994) using liquid browsing [1] and selection based (sketch-) queries. It allows realtime search and browsing at the same time (integrated into one single user interface) and can visualize the most important file system meta data dimensions simultaneously: 1. filename, 2. creation/modification date, 3. filesize, 4. filetype and 5. label. LSS provides very fast and easy visual data mining possibilities for the desktop and makes it possible to perceive complex dependencies between the most important file system meta data properties at a glance. It also overcomes the "hidden-deep-down-in-hierarchy-structures "-problem by making it possible to use folders for structuring but not being bound to them. This paper focuses on visual design and interaction aspects and emphasizes the importance of paying regard to visual interactive details for information visualization and interaction interfaces and the need of making it easy to use.

关键词： liquid browsing focus and context visual interactive information spaces mobile computing user interface design dynamic interactive visualization visual data mining file system browsing

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A context-oriented RDF Database 1

A context-oriented RDF Database

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1st International Conference on Semantic Web and Databases, SWDB 2003

作者： Tazari, Mohammad-Reza Computer Graphics Center Dept. Mobile Information Visualization Fraunhoferstraße 5 Darmstadt64283 Germany

The importance of contextual knowledge in knowledge management and organizational memory is shown in topical literature. Even in an initial visionary scenario for the Semantic Web, one can immediately encounter the contextual knowledge needed to realize the necessary services. Hence, it is not inappropriate to claim that context management is an integral service of the Semantic Web. After discussing the distributed nature of contextual knowledge, we define some requirements for a context-oriented database service and then introduce CORD as a service satisfying those requirements based on the Semantic Web technologies. Selected features of CORD that provide some contribution to the discussions within the Semantic Web research community, like embedded resources, query language, and definition of rules, are discussed in some detail.

关键词： Query languages

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BrainCove: A tool for voxel-wise fMRI brain connectivity visualization

BrainCove: A tool for voxel-wise fMRI brain connectivity vis...

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Van Dixhoorn, A.F. Milles, J. Van Lew, B. Botha, C.P. Computer Graphics and Visualization Dept. of INSY Delft University of Technology Delft Netherlands LKEB Dept. of Radiology Leiden University Medical Center Leiden Netherlands

ISBN: (纸本)9783905674385

Functional brain connectivity from fMRI studies has become an important tool in studying functional interactions in the human brain as a complex network. Most recently, research has started focusing on whole brain functional networks at the voxel-level, where fMRI time-signals at each voxel are correlated with every other voxel in the brain to determine their functional connectivity. For a typical 4mm isotropic voxel resolution, this results in connectivity networks with more than twenty thousand nodes and over 400 million links. These cannot be effectively visualized or interactively explored using node-link representations, and due to their size are challenging to show as correlation matrix bitmaps. In this paper, we present a number of methods for the visualization and interactive visual analysis of this new high resolution brain network data, both in its matrix representation as well as in its anatomical context. We have implemented these methods in a GPU raycasting framework that enables real-time interaction, such as network probing and volume deformation, as well as real-time filtering. The techniques are integrated in a visual analysis application in which the different views are coupled, supporting linked interaction. Furthermore, we allow visual comparison of different brain networks with side-by-side and difference visualization. We have evaluated our approach via case studies with domain scientists at two different university medical centers. © The Eurographics Association 2012.

关键词： visualization

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Deep Light Direction Reconstruction from single RGB images 29

Deep Light Direction Reconstruction from single RGB images

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29th International Conference in Central Europe on computer graphics, visualization and computer Vision, WSCG 2021

作者： Miller, Markus Nischwitz, Alfred Westermann, Rüdiger Dept. of Computer Science and Mathematics University of Applied Sciences Munich Lothstr. 64 Bavaria MunichD-80335 Germany Chair of Computer Graphics and Visualization Technical University Munich Boltzmannstr. 3/II Bavaria GarchingD-85748 Germany

ISBN: (纸本)9788086943343

In augmented reality applications, consistent illumination between virtual and real objects is important for creating an immersive user experience. Consistent illumination can be achieved by appropriate parameterisation of the virtual illumination model, that is consistent with real-world lighting conditions. In this study, we developed a method to reconstruct the general light direction from red-green-blue (RGB) images of real-world scenes using a modified VGG-16 neural network. We reconstructed the general light direction as azimuth and elevation angles. To avoid inaccurate results caused by coordinate uncertainty occurring at steep elevation angles, we further introduced stereographically projected coordinates. Unlike recent deep-learning-based approaches for reconstructing the light source direction, our approach does not require depth information and thus does not rely on special red-green-blue-depth (RGB-D) images as input. © 2021 University of West Bohemia. All rights reserved.

关键词： Image reconstruction

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Remote analysis for brain shift compensation 4th

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4th International Conference on Medical Image Computing and computer-Assisted Intervention, MICCAI 2001

作者： Hastreiter, P. Engel, K. Soza, G. Bauer, M. Wolf, M. Ganslandt, O. Fahlbusch, R. Greiner, G. Ertl, T. Nimsky, Ch Dept. Of Neurosurgery University of Erlangen-Nuremberg Germany Visualization and Interactive Systems Group University of Stuttgart Germany Computer Graphics Group University of Erlangen-Nuremberg Germany Knowledge Processing Group Bavarian Research Center for Knowledge-Based Systems Germany

ISBN: (纸本)3540426973

The compensation for brain shift is assisted by intraoperative imaging. For the purpose of fast registration and interactive visualization, a framework is presented based on local desktop computers and remote high-end computers with a maximum of compute power and graphics capacity. In this context, functional markers resulting from preoperative measurements (MEG, fMRI) are mapped to the intraoperative situation. Overall, results from 5 cases demonstrate the value of the suggested environment. © Springer-Verlag Berlin Heidelberg 2001.

关键词： visualization

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Polyhedra generation from lattice points 6th

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6th International Workshop on Discrete Geometry for computer Imagery, DGCI 1996

作者： Kenmochi, Yukiko Imiya, Atsushi Ezquerra, Norberto F. Dept. of Information and Computer Sciences Chiba University 1-33 Yayoi-cho Inage-kuChiba263 Japan Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology 801 Atlantic Drive AtlantaGA30332-0280 United States

ISBN: (纸本)9783540620051

This paper focuses on a method for generating polyhedra from a set of lattice points, such as three-dimensional (3D) medical computerized tomography images. The method is based on combinatoriM topology [1] and algebraic properties of the 3D lattice space [2]. It is shown that the method can uniquely generate polyhedra from a subset of the lattice space independently of the choice of neighborhood. Furthermore, a practical algorithm is developed and experimental results using 3D medical imagery are presented. © Springer-Verlag Berlin Heidelberg 1996.

关键词： Topology

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User-centric service brokerage in a personal multi-agent environment

User-centric service brokerage in a personal multi-agent env...

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International Conference on Integration of Knowledge Intensive Multi-Agent Systems (KIMAS)

作者： M.-R. Tazari K. Ploesser Dept. Mobile Information Visualization Fraunhoferstraße 5 64283 Darmstadt Computer Graphics Center (ZGDV e.V) Darmstadt Germany Dept. Mobile Inf. Visualization Comput. Graphics Center Darmstadt Germany

Service brokerage is a central issue in mult-agent systems. Existing approaches often address the brokering among agents in terms of cooperative problem solving. Our work, however, deals with brokering the services offered to users in a multiagent system. The user should be able to choose the desired services and assign concrete tasks to the service-offering agents utilizing those services. To this end, we based our work on the "semantic Web services " approach. After pointing out the problems the users and agents are faced with, we discuss some related approaches and introduce the results of our work: a broker agent as a user service of the agent platform.

关键词： Mobile agents Context-aware services computer graphics visualization Problem-solving Multiagent systems Mobile computing Intelligent agent Protection Open source software

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

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作者： Jang, Justin Wonka, Peter Ribarsky, William Shaw, Christopher D. Georgia Institute of Technology GVU Center College of Computing Atlanta GA 30332 United States Arizona State University PRISM Dept. of Computer Science and Engineering Tempe AZ 85287 United States UNC Charlotte CS Dept. Charlotte Visualization Center Charlotte NC 28223 United States Simon Fraser University Surrey School of Interactive Arts and Technology 14-660 Central City Tower 13450 102 Ave Surrey BC V3T 5X3 Canada Graphics Visualization and Usability Center Georgia Institute of Technology PRISM Lab. ASU Department of Information Technology UNC Charlotte Charlotte Visualization Center IEEE Visualization and Graphics Technical Committee School of Interactive Arts and Technology Simon Fraser University Surrey

We present a simplification algorithm for manifold polygonal meshes of plane-dominant models. Models of this type are likely to appear in man-made environments. While traditional simplification algorithms focus on generality and smooth meshes, the approach presented here considers a specific class of man-made models. By detecting and classifying edge loops on the mesh and providing a guided series of binary mesh partitions, our approach generates a series of simplified models, each of which better respects the semantics of these kinds of models than conventional approaches do. A guiding principle is to eliminate simplifications that do not make sense in constructed environments. This, coupled with the concept of "punctuated simplification", leads to an approach that is both efficient and delivers high visual quality. Comparative results are given.

关键词： Object oriented programming

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Scientific and artistic investigation of multi-dimensional fractals on the AT & T pixel machine

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The Visual computer 1993年第7期9卷 346-355页

作者： Hart, John C. Lescinsky, Gordon W. Sandin, Daniel J. DeFanti, Thomas A. Kauffman, Louis H. School of EECS Washington State University Pullman 99/64-2752 WA United States Advanced Computer Graphics Centre Royal Melbourne Institute of Technology Victoria Melbourne Australia Electronic Visualization Laboratory EECS Dept. M/C 154 University of Illinois at Chicago Chicago 60680-4348 IL United States

The pipelined architecture and parallel organization of the AT&T Pixel Machine image computer are described and demonstrated with applications for the visualization of multidimensional fractals, particularly linear fractals and quaternion/ stacked Julia sets. Techniques for pushing the Pixel Machine to its peak abilities are described and apply to more recent parallel image computers as well. © 1993 Springer-Verlag.

关键词： Fractals Parallelism

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Area-contact haptic simulation

Area-contact haptic simulation

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International Symposium on Surgery Simulation and Soft Tissue Modeling, IS4TM 2003

作者： Kim, Sang-Youn Park, Jinah Kwon, Dong-Soo Teloperation and Control Laboratory Dept. of Mechanical Engineering KAIST Guseong-Dong 373-1 Yuseung-gu Daejeon305-701 Korea Republic of Computer Graphics and Visualization Laboratory School of Engineering ICU Hwaam-Dong 58-4 Yugeong-gu Daejeon305-732 Korea Republic of

ISBN: (纸本)3540404392

This paper presents the haptic interaction method when the interaction occurs at several points simultaneously. In many virtual training systems that interact with a virtual object, the haptic interface is modeled as a point. However, in the real world, the portion interacting with real material is not a point but rather multiple points, i.e., an area. In this paper, we address an areabased haptic rendering technique that enables the user to distinguish hard regions from softer ones by providing the distributed reflected force and the sensation of rotation at the boundary. We have used a shape retaining chain linked model that is suitable for real-time applications in order to develop a fast areabased volume haptic rendering method for volumetric objects. We experimented with homogeneous and non-homogeneous virtual objects consisting of 421,875 (75x75x75) volume elements. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Haptic interfaces

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