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VIS 05: IEEE visualization 2005, Proceedings

作者： Viola, Ivan Gröller, Meister E. Hadwiger, Markus Bühler, Katja Preim, Bernhard Sousa, Mario Costa Ebert, David S. Stredney, Don Kanitsar, Armin Bruckner, Stefan Grimm, Sören Svakhine, Nikolai A. Jang, Yun Gaithert, Kelly Tietjen, Christian Krüger, Arno Peitgen, Heinz-Otto Isenberg, Tobias Hintze, Jana Hertel, Ilka Strauß, Gero Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Department of Simulation and Graphics University of Magdeburg Germany Department of Computer Science University of Calgary Canada School of Electrical and Computer Engineering Purdue University United States Ohio Supercomputer Center United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Electrical and Computer Engineering Purdue University United States IEEE Austria Department of Computer Science University of Calgary Canada Department of Computer Science Computer Graphics Research Lab. University of Calgary Canada Purdue University United States Ohio Supercomputer Center United States University of Texas Austin United States Interface Laboratory United States Biomedical Applications United States Department of Simulation and Graphics Otto-von-Guericke-University of Magdeburg Germany Otto-von-Guericke-University of Magdeburg FIN/ISG Germany Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 28359 Bremen Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany ENT Department University Hospital of Leipzig Germany

ISBN: (纸本)0780394623

The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computer graphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology

关键词： visualization

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2D/3D non-rigid registration of volumetric CT lung data using thin-plate spline

2D/3D non-rigid registration of volumetric CT lung data usin...

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International Conference on e-health Networking, Applications and Services (HealthCom)

作者： J. Kim H. Park Digital Ocean & Virtual Environment Center Korea Ocean Research and Development Institute South Korea Computer Graphics & Visualization Laboratory Information and Communications University South Korea

In the medical image analysis for the human organs, non-rigid registration is necessary to properly register the local deformation. Especially for the dynamic organs like a heart and lungs, it is essential to process the registration method in three-dimensional space to track their through-plane motion. In this paper, we suggest the 2D/3D non-rigid registration method based on the corresponding anatomical landmarks using thin-plate spline (TPS). By extending two-dimensional TPS, we developed 3D TPS and computed its bending energy function to register the local deformations of the volumetric time-varying lung CT data. Our experimental results show that our method is suitable for handling volumetric deformation with a small number of anatomical landmarks.

关键词： Lungs Spline Biomedical imaging Computed tomography Humans Image registration Oceans Registers Heart Tracking

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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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Smart 3D visualizations in clinical applications

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3rd International Symposium on Smart graphics, SG 2003

作者： Preim, Bernhard Peitgen, Heinz-Otto Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 Magdeburg39106 Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 Bremen28359 Germany

ISBN: (纸本)3540405577

We discuss techniques for the visualization of medical volume data dedicated for their clinical use. We describe the need for rapid dynamic interaction facilities with such visualizations and discuss emphasis techniques in more detail. Another crucial aspect of medical visualization is the integration of 2d and 3d visualizations. In order to organize this discussion, we introduce 6 „Golden"rules for medical visualizations. © Springer-Verlag Berlin Heidelberg 2003.

关键词： visualization

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A model-based method for building reconstruction

A model-based method for building reconstruction

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IEEE International Workshop on Higher-Level Knowledge in 3D Modeling and Motion Analysis (HLK)

作者： K. Schindler J. Bauer Computer Graphics and Vision Graz University of Technology Graz Austria VRVis Research Center for Virtual Reality and Visualization Graz Austria

Model-based reconstruction methods are applied to the detailed reconstruction of buildings from close-range images. The 3D points obtained through image matching are segmented into a coarse polyhedral model with a robust regression algorithm, then the geometry of this model is refined with predefined shape templates in order to automatically recover a CAD-like model of the building surface. Reprojection of the 3D shape templates is used to optimally fit their parameters to the image information. Throughout the paper the investigated methods are demonstrated on real datasets.

关键词： Solid modeling Image reconstruction Shape Reconstruction algorithms Image matching Image segmentation Robustness Geometry Surface fitting Surface reconstruction

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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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Remote computing environment compensating for brain shift

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computer Aided Surgery 2003年第4期8卷 169-179页

作者： Hastreiter, Peter Engel, Klaus Soza, Grzegorz Wolf, Matthias Ganslandt, Oliver Fahlbusch, Rudolf Greiner, Gnther Ximsky, Christopher Department of Neurosurgery Neurocenter Friedrich Alexander University of Erlangen-Nuremberg D-91054 Erlangen Schwabachanlage 6. Germany Computer Graphics Group University of Erlangen-Nuremberg Erlangen Germany Visualization and Interactive Systems Group University of Stuttgart Erlangen Germany Knowledge Processing Group Bavarian Research Center for Knowledge-Based Systems Erlangen Germany

Objective: Anatomical and functional image data become invalid during an operation due to brain shift. Compensation is achieved by using intraoperative imaging to update anatomical information. To accelerate the registration and visualization of pre- and intraoperative image data, the presented work focuses on remote computing capabilities. The underlying framework efficiently combines local desktop computers and remote high-end graphics workstations exploiting expensive hardware. Methods: By performing all computations on the remote computer, the MR volumes are rigidly aligned via voxel-based registration. Using graphics hardware for acceleration, all interpolation operations are performed with 3D texture-mapping hardware. A new approach then transforms functional markers from preoperative measurements to the intraoperative situation using an automatic tracking algorithm to identify corresponding sulci. Communicating Java viewers are suggested for analyzing the results interactively on a local computer, with all calculations being performed exclusively on the remote computer. Results: The suggested approach was successfully applied in S cases using MR data containing functional markers of MEG and fMRI measurements identifying eloquent brain areas. Remote large-scale graphics hardware was thereby efficiently made available for fast registration and interactive direct volume rendering in neurosurgery. Conclusion: Overall, the presented framework demonstrates efficient access of expensive high- end hardware remotely controlled by thin clients, and further emphasizes the need to compensate for brain shift in functional neuronavigation. © 2003 Informa UK Ltd All rights reserved.

关键词： 3D visualization brain shift registration remote computing

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Metropogis: A feature based city modeling system

Metropogis: A feature based city modeling system

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2002 International Symposium of ISPRS Commission III on Photogrammetric computer Vision, PCV 2002

作者： Bauer, Joachim Klaus, Andreas Karner, Konrad Zach, Christopher Schindler, Konrad VRVis Research Center for Virtual Reality and Visualization United States Institute for Computer Graphics and Vision Graz University of Technology Austria

In this paper we report on a system to extract 3D information from oriented digital facade images using various feature extraction/matching methods. We emphasize on 2D feature extraction from digital images including contour chains, line segments and vanishing points. The extraction of 3D primitives is based on line matching over multiple oriented views and 3D plane detection by a line grouping process. The MetropoGIS system is designed for the automatic extraction of 3D data from facade images. © 2002 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Feature extraction

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Metropogis: A semi-automatic city documentation system

Metropogis: A semi-automatic city documentation system

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2002 International Symposium of ISPRS Commission III on Photogrammetric computer Vision, PCV 2002

作者： Klaus, Andreas Bauer, Joachim Karner, Konrad Schindler, Konrad VRVis Research Center for Virtual Reality and Visualization United States Institute for Computer Graphics and Vision Graz University of Technology Austria

In this paper we report on a new system to enhance a 3D block model of a real city with terrestrial measured data of the facades. The terrestrial data consists of photographs taken by a hand-held digital consumer camera using short baselines. The relative orientation of the photographs is calculated automatically and fitted towards the 3D block model with minimized human input using vanishing points. The introduced city documentation system delivers a fully 3D geographic information data set and is called MetropoGIS. © 2002 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Geographic information systems

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Novel uses of Pinch Gloves™ for virtual environment interaction techniques

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Virtual Reality 2002年第3期6卷 122-129页

作者： Bowman, D.A. Wingrave, C.A. Campbell, J.M. Ly, V.Q. Rhoton, C.J. Department of Computer Science Virginia Tech. Blacksburg VA United States College of Computing Graphics Visualization and Usability Center Georgia Institute of Technology GA United States Department of Computer Science (0106) Virginia Tech. Blacksburg VA 24061 United States

The usability of three-dimensional (3D) interaction techniques depends upon both the interface software and the physical devices used. However, little research has addressed the issue of mapping 3D input devices to interaction techniques and applications. This is especially crucial in the field of Virtual Environments (VEs), where there exists a wide range of potential 3D input devices. In this paper, we discuss the use of Pinch Gloves™ - gloves that report contact between two or more fingers - as input devices for VE systems. We begin with an analysis of the advantages and disadvantages of the gloves as a 3D input device. Next, we present a broad overview of three novel interaction techniques we have developed using the gloves, including a menu system, a text input technique, and a two-handed navigation technique. All three of these techniques have been evaluated for both usability and task performance. Finally, we speculate on further uses for the gloves. © Springer-Verlag London Ltd.

关键词： 3D Input Devices Interaction Techniques Pinch Gloves Usability Evaluation Virtual Environments

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