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Advanced medical image visualization and analysis systems for diagnosis and treatment planning

Advanced medical image visualization and analysis systems fo...

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Myoung-Hee Kim Yu-Bu Lee Yoo-Joo Choi Center for Computer Graphics and Virtual Reality Ewha Womans University Seoul South Korea Department of Computer Science and Engineering Ewha Womans University Seoul South Korea

ISBN: (纸本)0780386396

Most medical image processing techniques require the clinician to form a mental model of the anatomy being depicted. We present systems that allow a more direct visualization of anatomical shapes and measurement of parameters from medical image data, including time-dependent and multi-modal image sets. Cardiac-Station realistically represents heart motion and extracts clinical parameters from ventricular MR images, in the diagnosis of heart disease. Brain-Reg displays abnormal regions of the brain by registering multi-modal images, and supports the analysis of differences in the hippocampus between patients and a control group.

关键词： Biomedical imaging Medical diagnostic imaging Image analysis Medical treatment Data visualization Shape measurement Biomedical image processing Cognitive science Anatomy Heart

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Interactive TreemapsWith Detail on Demand to Support Information Search in Documents

Interactive TreemapsWith Detail on Demand to Support Informa...

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6th Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 2004

作者： Schlechtweg, Stefan Schulze-Wollgast, Petra Schumann, Heidrun Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Universitätsplatz 2 MagdeburgD-39106 Germany Institute of Computer Science University of Rostock Albert-Einstein-Straße 21 RostockD-18055 Germany

ISBN: (纸本)390567307X

This paper addresses the issue of how information visualization techniques can be used to assist full-text search in electronic documents. Our approach supports multiple term queries with interactive treemaps. We use a treemap to visualize the basic structure of the document and exploit color coding to show the distribution of query terms on various levels of the hierarchy. Furthermore, we include filtering techniques to concentrate on those parts of the structure that actually contain the requested information, and, finally provide interactive tools to give access to detailed information whenever the user wishes. © The Eurographics Association 2004.

关键词： Information systems

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Fractionally cascaded information in a sensor network

Fractionally cascaded information in a sensor network

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Third International Symposium on Information Processing in Sensor Networks, IPSN 2004

作者： Gao, Jie Guibas, Leonidas J. Hershberger, John Zhang, Li Department of Computer Science Stanford University Stanford CA 94305 United States Mentor Graphics 8005 S.W. Boeckman Road Wilsonville OR 97070 United States Hewlett-Packard Labs 1501 Page Mill Road Palo Alto CA 94304 United States

ISBN: (纸本)1581138466

We address the problem of distributed information aggregation and storage in a sensor network, where queries can be injected anywhere in the network. The principle we propose is that a sensor should know a "fraction" of the information from distant parts of the network, in an exponentially decaying fashion by distance. We show how a sampled scalar field can be stored in this distributed fashion, with only a modest amount of additional storage and network traffic. Our storage scheme makes neighboring sensors have highly correlated world views;this allows smooth information gradients and enables local search algorithms to work well. We study in particular how this principle of fractionally cascaded information can be exploited to answer range queries about the sampled field efficiently. Using local decisions only we are able to route the query to exactly the portions of the field where the sought information is stored. We provide a rigorous theoretical analysis showing that our scheme is close to optimal.

关键词： Sensors

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Fractionally cascaded information in a sensor network

Fractionally cascaded information in a sensor network

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International Symposium on Information Processing in Sensor Networks (IPSN)

作者： Jie Gao L.J. Guibas J. Hershberger Li Zhang Department of Computer Science University of Stanford Stanford CA USA Mentor Graphics Wilsonville OR USA Hewlett Packard Laboratories Palo Alto CA USA

We address the problem of distributed information aggregation and storage in a sensor network, where queries can be injected anywhere in the network. The principle we propose is that a sensor should know a "fraction" of the information from distant parts of the network, in an exponentially decaying fashion by distance. We show how a sampled scalar field can be stored in this distributed fashion, with only a modest amount of additional storage and network traffic. Our storage scheme makes neighboring sensors have highly correlated world views; this allows smooth information gradients and enables local search algorithms to work well. We study in particular how this principle of fractionally cascaded information can be exploited to answer range queries about the sampled field efficiently. Using local decisions only we are able to route the query to exactly the portions of the field where the sought information is stored. We provide a rigorous theoretical analysis showing that our scheme is close to optimal.

关键词： Intelligent networks Algorithm design and analysis Permission Distributed databases Sensor phenomena and characterization Telecommunication traffic Information systems Information retrieval Information analysis computer science

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Robust occupancy detection from stereo images

Robust occupancy detection from stereo images

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Proceedings - 7th International IEEE Conference on Intelligent Transportation Systems, ITSC 2004

作者： Alefs, Bram Clabian, Markus Bischof, Horst Kropatsch, Walter Khairallah, Farid Adv. Comp. Vision GmbH ACV Vienna Donau-City-Strasse 1 A-1220 Vienna Austria Advanced Computer Vision GmbH ACV Farmington Hills MI 48335 United States Inst. for Comp. Graphics and Vision Graz University of Technology Inffeldgasse 16 2. OG A-8010 Graz Austria Computer Science Department Inst. of Computer Aided Automation Vienna University of Technology Favoritenstrasse 9/1832 A-1040 Vienna Austria TRW Automotive 24175 Research Drive Farmington Hills MI 48335 United States

Vehicle occupants that are out-of-position can be deadly injured by the deployment of the air bag in a crash situation. In recent years many different sensors and systems have been proposed to detect the type of occupant and the position of the occupant's head. This paper presents a method for classification and occupant's head detection based on passive stereo vision. The proposed system uses depth surface analysis and scene statistics together with support vector machines for classification and selection of head candidates. Evaluation of the method shows 99% correct for classification and 98% correct for head detection, using large sets of image data, and image sequences recorded in a driving vehicle.

关键词： Stereo vision

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Robust occupancy detection from stereo images

Robust occupancy detection from stereo images

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International Conference on Intelligent Transportation

作者： B. Alefs M. Clabian H. Bischof W. Kropatsch F. Khairallah Advanced Computer Vision GmbH-ACV Vienna Austria Advanced Computer Vision GmbH-ACV Austria Institute for Computer Graphics and Vision Graz University of Technology Graz Austria Pattern Recognition and Image Processing Group Institute of Computer Aided Automation Computer Science Department University of Technology Vienna Vienna Austria TRW Automotive GmbH Farmington Hills MI USA

Vehicle occupants that are out-of-position can be deadly injured by the deployment of the air bag in a crash situation. In recent years many different sensors and systems have been proposed to detect the type of occupant and the position of the occupant's head. This work presents a method for classification and occupant's head detection based on passive stereo vision. The proposed system uses depth surface analysis and scene statistics together with support vector machines for classification and selection of head candidates. Evaluation of the method shows 99% correct for classification and 98% correct for head detection, using large sets of image data, and image sequences recorded in a driving vehicle.

关键词： Robustness Magnetic heads Vehicle crash testing Sensor systems Stereo vision Layout Statistical analysis Support vector machines Support vector machine classification Vehicle detection

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Multiple-contact representation for the real-time volume haptic rendering of a non-rigid object

Multiple-contact representation for the real-time volume hap...

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International Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (HAPTICS)

作者： Sang-Youn Kim Jinah Park Dong-Soo Kwon Telerobotics & Control Laboratory Department of Mechanical Engineering Korea Advanced Institute of Science and Technology South Korea Computer Graphics & Visualization Laboratory School of Engineering ICU South Korea

ISBN: (纸本)0769521126

This paper presents a fast haptic rendering method providing the sense of touch from a virtual volumetric non-rigid object when a human operator interacts with the object at multiple points. Previously, we have proposed a fast volume haptic rendering method based on the shape-retaining chain linked model (or the S-chain model) that can handle the deformation of a volumetric non-rigid object and its haptic feedback in real time. One of the key differences between the S-chain model and a traditional FEM or mass-spring model is that the computation of the deformation and its reflected force is performed at a local level. When there are more than one interaction points with the object, it is necessary to consider a modeling framework that can handle human operator's all inputs together. In this paper, we propose a modeling framework in which forces generated at interaction points are vectorially summed to deal with the multiple contact points. Our experiments demonstrate that our proposed method is suitable for the real-time volume haptic rendering of a volumetric non-rigid object with multiple-contact points.

关键词： Haptic interfaces Humans Rendering (computer graphics) Computational modeling Deformable models Minimally invasive surgery Laboratories Feedback Telerobotics Mechanical engineering

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Combining and points for interactive high-quality rendering

Combining and points for interactive high-quality rendering

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ACM SIGGRAPH 2003

作者： Bala, Kavita Walter, Bruce Greenberg, Donald P. Computer Science Department Cornell University Program of Computer Graphics Cornell University

This paper presents a new interactive rendering and display technique for complex scenes with expensive shading, such as global illumination. Our approach combines sparsely sampled shading (points) and analytically computed discontinuities (edges) to inter-actively generate high-quality images. The edge-and-point image is a new compact representation that combines edges and points such that fast, table-driven interpolation of pixel shading from nearby point samples is possible, while respecting discontinuities. The edge-and-point renderer is extensible, permitting the use of arbitrary shaders to collect shading samples. Shading discontinuities, such as silhouettes and shadow edges, are found at interactive rates. Our software implementation supports interactive navigation and object manipulation in scenes that include expensive lighting effects (such as global illumination) and geometrically complex objects. For interactive rendering we show that high-quality images of these scenes can be rendered at 8-14 frames per second on a desktop PC: a speedup of 20-60 over a ray tracer computing a single sample per pixel. © 2003 ACM.

关键词： Image analysis

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Middleware support for seamless multimedia home entertainment for mobile users and heterogeneous environments

Middleware support for seamless multimedia home entertainmen...

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Proceedings of the Seventh IASTED International Conference on Internet and Multimedia Systems and Applications

作者： Lohse, Marco Slusallek, Philipp Computer Graphics Lab Department of Computer Science Saarland University Saarbrücken Germany

ISBN: (纸本)0889863806

The emergence of mobile devices in multimedia home entertainment demands new application scenarios like ubiquitous multimedia access. However today's home entertainment appliances are usually based on a closed hardware and software design and do not provide the extensibility and flexibility needed. In this paper, we present a middleware that allows to control and connect distributed and mobile multimedia devices with different underlying technology. Based on this middleware we demonstrate an extensible application framework for a multimedia home entertainment center. This framework provides session hand off for seamless multimedia playback in heterogeneous environments where users with mobile devices can transparently exploit the capabilities of nearby stationary systems.

关键词： Middleware

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Translucent Shadow Maps

Translucent Shadow Maps

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14th Eurographics Workshop on Rendering Techniques, EGSR 2003

作者： Dachsbacher, Carsten Stamminger, Marc Computer Graphics Group Department of Computer Science University of Erlangen-Nuremberg Germany

ISBN: (纸本)3905673037

Shadow maps are a very efficient means to add shadows to arbitrary scenes. In this paper, we introduce Translucent Shadow Maps, an extension to shadow maps which allows very efficient rendering of sub-surface scattering. Translucent Shadow Maps contain depth and incident light information. Sub-surface scattering is computed on-the-fly during rendering by filtering the shadow map neighborhood. This filtering is done efficiently using a hierarchical approach. We describe optimizations for an implementation of Translucent Shadow Maps on contemporary graphics hardware, that can render complex translucent objects with varying light and material properties in real-time. © The Eurographics Association 2003.

关键词： Surface scattering

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