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检索条件"任意字段=Conference on Visualization in Biomedical Computing"

共 893 条记录，以下是741-750 订阅

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Marching through the Visible Man 95

Marching through the Visible Man

引用

IEEE conference on visualization

作者： W.E. Lorensen GE Corporate Research and Development Center Schenectady NY USA

ISBN: (纸本)9780818671876

The National Library of Medicine is creating a digital atlas of the human body. This project, called the Visible Human, has already produced computed tomography, magnetic resonance imaging and physical cross-sections of a human male cadaver. This paper describes a methodology and results for extracting surfaces from the Visible Male's CT data. We use surface connectivity and isosurface extraction techniques to create polygonal models of the skin, bone, muscle and bowels. We also report early experiments with the physical cross-sections.

关键词： Humans Computed tomography Data mining Software libraries biomedical imaging Magnetic resonance imaging Cadaver Isosurfaces Biological system modeling Skin

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Estimating the tensor of curvature of a surface from a polyhedral approximation

Estimating the tensor of curvature of a surface from a polyh...

引用

International conference on Computer Vision (ICCV)

作者： G. Taubin IBM Thomas J. Watson Research Center Yorktown Heights NY USA

Estimating principal curvatures and principal directions of a surface from a polyhedral approximation with a large number of small faces, such as those produced by iso-surface construction algorithms, has become a basic step in many computer vision algorithms, particularly in those targeted at medical applications. We describe a method to estimate the tensor of curvature of a surface at the vertices of a polyhedral approximation. Principal curvatures and principal directions are obtained by computing in closed form the eigenvalues and eigenvectors of certain 3/spl times/3 symmetric matrices defined by integral formulas, and closely related to the matrix representation of the tensor of curvature. The resulting algorithm is linear, both in time and in space, as a function of the number of vertices and faces of the polyhedral surface.< >

关键词： Tensile stress Face detection Approximation algorithms Computer vision Eigenvalues and eigenfunctions Medical services biomedical equipment biomedical imaging visualization Linear systems

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High-speed volume rendering using redundant block compression 95

High-speed volume rendering using redundant block compressio...

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IEEE conference on visualization

作者： G. Knittel Wilhelm-Schickard-Institut für Informatik-Graphisch-Interaktive Systeme (WSI/GRIS) University of Tübingen Tubingen Germany

ISBN: (纸本)9780818671876

Presents a novel volume rendering method which offers high rendering speed on standard workstations. It is based on a lossy data compression scheme which drastically reduces the memory bandwidth and computing requirements of perspective raycasting. Starting from classified and shaded data sets, we use block truncation coding or color cell compression to compress a block of 12 voxels into 32 bits. All blocks of the data set are processed redundantly, yielding a data structure which avoids multiple memory accesses per raypoint. As a side effect, the tri-linear interpolation of data coded in such a way is very much simplified. These techniques allow us to perform walkthroughs at interactive frame rates. Furthermore, the algorithm provides depth-cueing and the semi-transparent display of different materials. The algorithm achieves a sustained frame generation rate of about 2 Hz for large data sets (/spl sim/200/sup 3/) at an acceptable image quality on an SGI Indy workstation. A number of examples are shown.

关键词： Data visualization Displays Workstations Bandwidth Image quality biomedical imaging Rendering (computer graphics) Data compression Data structures Ear

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Measurement and analysis of defocused point spread functions and optical transfer functions of a microscope

Measurement and analysis of defocused point spread functions...

引用

IEEE Pacific Rim conference on Communications, Computers and Signal Processing

作者： J. Li P. Agathoklis F. Peet G. Jensen T. Sahota Dept. of Electr. & Comput. Eng. Victoria Univ. BC Canada Department of Electrical and Computer Engineering University of Victoria BC Canada Pacific Forestry Centre Victoria BC Canada

The defocused point spread functions and optical transfer functions of a microscope were measured and analyzed. The main purpose of the analysis was to verify the accuracy of analytical approximations of these functions, which were presented but not extensively studied in the literature. The measured results were compared with those calculated by Castleman's (1979) theoretical approximation, in the space and frequency domains, graphically and numerically. The results showed that for the numerical apertures used, the theoretical functions were close to the measured functions, and thus Castleman's theoretical approximation is a fairly good approximation. These defocused point spread functions are being used for the optical sectioning as part of microscope image visualization system described by Li, Agathokils, Peet, Jensen and Sahota (see Proceedings of 1993 Canadian conference on Electrical and Computer Engineering, p.1013-1016, Sept. 1993, Vancouver).

关键词： Transfer functions Microwave integrated circuits biomedical optical imaging Light sources Optical microscopy Optical recording Data visualization Data acquisition Optical computing Forestry

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Visual Who: a demonstration 95

引用

ACM International conference on Multimedia

作者： Judith S. Donath MIT Media Lab 20 Ames Street E15-428 Cambridge MA 02138

ISBN: (纸本)0201877740

The goal of Visual Who is to make the social patterns of an electronic community visible. Using data such as mailing list subscriptions, it creates a spring based model of the patterns of affiliation within the community. By varying the groups chosen as anchor points, the user can interactively explore the underlying social and organizational structure. The resulting image of the community can be used as the basis for visualizing other data, such as the patterns of activity found in the record of login and idle times.

关键词： visualization login Subscriptions anchor point DVD Audio organization structure Mail whois

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The Programmers' Playground: A Demonstration 95

引用

ACM International conference on Multimedia

作者： Kenneth J. Goldman T. Paul McCartney Ram Sethuraman Bala Swaminathan Department of Computer Science Washington University St. Louis Missouri 63130

ISBN: (纸本)0201877740

We demonstrate The Programmers' Playground, a programming environment that supports end-user construction of distributed multimedia applications. Features include separation of communication and computation, dynamic end-user configuration of distributed applications, separation of active & reactive control, and migration of running modules. Applications include a process control simulation, planetary orbits visualization, medical image processing pipeline, a multimedia conferencing application, and a user interface management system for constructing customized graphical user interfaces (GUIs).

关键词： direct manipulation distributed computing graphical user interfaces multimedia reconfiguration user interface management system graphical user interfaces direct manipulation Distributed computing Reconfiguration MULTI-MEDIA SYSTEM Sports grounds Computer personnel programming environments MULTIMEDIA APPLICATION End users

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BUNKER VIEW - LIMITED-RANGE HEAD-MOTION-PARALLAX visualization FOR COMPLEX DATA SETS

BUNKER VIEW - LIMITED-RANGE HEAD-MOTION-PARALLAX VISUALIZATI...

引用

3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： STATE, A BALU, S FUCHS, H UNIV N CAROLINA DEPT COMP SCICHAPEL HILLNC 27514

ISBN: (纸本)0819416983

This work presents a head-motion-parallax visualization system for arbitrarily complex computer graphics databases (such as biomedical data sets) using precomputed images. It features a large rear-projection screen and a blind restricting the range of possible vantage points. We describe implementation details for the high-resolution low-lag prototype system and relate first reactions from users.

关键词： visualization Head computing systems Image registration Virtual reality Optical tracking Prototyping Databases Eye 3D image processing

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COMPUTERIZED ATLAS FOR FUNCTIONAL STEREOTAXIS ROBOTICS AND RADIOSURGERY

COMPUTERIZED ATLAS FOR FUNCTIONAL STEREOTAXIS ROBOTICS AND R...

引用

3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： HARDY, TL ALVARADO HOSP CTR STEREOTACT & MOVEMENT DISORDERSSAN DIEGOCA

ISBN: (纸本)0819416983

The implementation and use of a computerized whole-brain mapping system which can be used in conjunction with the major imaging modalities (MR, CT, angiography, PET, SPECT) is described. Three mapping systems (brainstem anatomical, electrophysiological, and proportional whole-brain) based upon common reference structures about the third and fourth ventricular core of the brain are used in conjunction with internationally recognized nomenclature to create a comprehensive normalized whole-brain mapping system. This mapping technique can be universally applied to aid in discerning the surgical and anatomico-physiological topography of the brain for medical imaging.

关键词： Brain mapping Brain Associative arrays computing systems Neuroimaging Imaging systems Computed tomography Magnetic resonance imaging Databases Robotics

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SIMULATING MOTION OF ANATOMICAL OBJECTS WITH VOLUME-BASED 3D-visualization

SIMULATING MOTION OF ANATOMICAL OBJECTS WITH VOLUME-BASED 3D...

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3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： PFLESSER, B TIEDE, U HOHNE, KH UNIV HAMBURG HOSP EPPENDORFINST MATH & COMP SCI MEDD-20246 HAMBURGGERMANY

ISBN: (纸本)0819416983

Simulation and 3D visualization of object motion is a prerequisite for any surgical planning system. In order to provide feedback to show whether a realistic motion has been simulated, it is necessary to detect, quantify and visualize interpenetrating volumes. This cannot be achieved by common surface based methods. Therefore we developed a voxel-based approach, providing the full information of the tomographic volume data. We present an extended ray-casting algorithm which allows visualization of object motion using ray compositing, thus avoiding explicit manipulation of the image volume. Possible volumetric intersections may be visualized and quantified and interior properties of scenes with any displace objects may be explored using volume cuts.

关键词： visualization Surgery Computer simulations Data modeling Information visualization Volume rendering 3D displays Image visualization Motion models Tomography

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FUZZY OBJECTS AND THEIR BOUNDARIES

FUZZY OBJECTS AND THEIR BOUNDARIES

引用

3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： UDUPA, JK SAMARASEKERA, S VENUGOPAL, KP GREVERA, G UNIV PENN DEPT RADIOLPHILADELPHIAPA 19104

ISBN: (纸本)0819416983

Measured data are inherently inaccurate. Operations done on data for defining, visualizing, manipulating and analyzing object information should attempt to retain these inaccuracies as accurately as possible. The theory of fuzzy sets is a proper mathematical vehicle for this purpose. In this attempt, topological notions such as adjacency, connectedness, and boundary need to be developed starting from fuzzy sets. We develop such a framework in this paper and present algorithms for finding fuzzy connected components and boundaries in digital imagery. We demonstrate the usefulness of these algorithms in medical applications, particularly in separating objects that come close together which are otherwise difficult to segment using hard (non-fuzzy) criteria.

关键词： Fuzzy logic visualization Surgery Visual analytics Algorithm development Image segmentation Volume rendering Binary data biomedical optics Image processing algorithms and systems

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