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检索条件"任意字段=Conference on Visual Data Exploration and Analysis II"

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data STRUCTURES FOR GIGABYTE SYSTEMS 2

DATA STRUCTURES FOR GIGABYTE SYSTEMS

引用

conference on visual data exploration and analysis ii

作者： KLINGER, A UNIV CALIF LOS ANGELES LOS ANGELESCA 90024

ISBN: (纸本)0819417572

This paper involves data structures in planning to combine engineering research areas considered as communication modes: image, outline-sketches, and speech. Images are enhanced compressed and transmitted, but in graphics solid display is central, while in speech recognition/identification dominate. Outside computing, graphics uses sketch, outline-drawing, or schematic summaries of other data (photographic images). Practical image-processing involves comparisons, features/edges, shape, and segmentation, using both transforms and other global analyses. Most speech work involves domain restriction. This limit can be deleted by focussing on data structures: they can link word and picture domains, and allow for captioning, for indexing/highlighting-domains to users. This shows data structures enable implementing useful functions, support information-handling with synergistic benefits: the paper's theme. data structuring is also the theme of recent research literature on alternate means for visual presentation of multiple-measure numerical data. This paper briefly surveys these materials. We show how research from the data structure field enables new methods for addressing visualization issues, improves large-record data-handling, and aids greater use of visual and numerical records. (This expands on a talk presented 8 July 1994 at Argonne National Laboratory.)

关键词： data STRUCTURES INDEXING SPEECH data analysis MULTIPLE INFORMATION SOURCES SCHEMATIC SUMMARIES MAPS MEDICAL IMAGES

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NOVEL APPROACH TO INTERACTIVE EDITING OF RASTER BASED data 2

NOVEL APPROACH TO INTERACTIVE EDITING OF RASTER BASED DATA

引用

conference on visual data exploration and analysis ii

作者： LUI, AK BONE, D AUSTRALIAN NATL UNIV CSIROCOMP SCI LABDIV INFORMAT TECHNOLCANBERRAACT 2600AUSTRALIA

ISBN: (纸本)0819417572

Expert interpretation of raster-based data, needed when, for example, automatic reconstruction of sparsely sampled data cannot produce accurate models, requires a means for interaction through which the expert's knowledge can be incorporated into the model to improve accuracy. If such expert interpretation is to be viable, the interaction must be intuitive, direct and flexible. We present a novel approach to the design of such interaction: the use of the discrete thin-plate spline permits interactive manipulation of the stiffness and tension parameters in the plate to control the behavior between control points; an object based approach allows raster based objects to be manipulated in an intuitive manner in the context of a visual representation of the objects. The editor adopts a problem driven approach which allows specialized editing tools to be developed for editing in a specific application domain. A prototype implementation of the editor is presented which provides insights into the advantages and limitations of the approach.

关键词： COMPUTER GRAPHICS HUMAN-COMPUTER INTERACTION RASTER BASED data EDITING THIN-PLATE SPLINES INTERACTIVE EDITING DIRECT MANIPULATION OBJECT BASED EDITING visualIZATION OBJECT COMPOSITION

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MASSIVELY PARALLEL SURFACE RENDERING 2

MASSIVELY PARALLEL SURFACE RENDERING

引用

conference on visual data exploration and analysis ii

作者： DATTA, S GUHA, R UNIV CENT FLORIDA DEPT COMP SCIORLANDOFL 32816

In this parallel surface rendering algorithm based on dividing cube2 on a SIMD machine MasPar MP-1, we address the problem of load balancing and image composition. We divide a 3D array of Nx x Ny x Nz volume data into... 详细信息

ISBN: (纸本)0819417572

In this parallel surface rendering algorithm based on dividing cube² on a SIMD machine MasPar MP-1, we address the problem of load balancing and image composition. We divide a 3D array of N_x x N_y x N_z volume data into N_x x N_y columns, each N_z deep. Each processor in the mesh receives a subvolume of such data columns. All processors synchronously traverse its subvolume to determine the voxels intersecting the isosurface. Intersecting voxels are called isovoxels. Partial load balancing distributes the isovoxels contained in a row of processors evenly among the processors in that row to reduce the network traffic and complexity of the rendering phase. Each isovoxel is subdivided into point primitives using dividing cube algorithm. Rendering algorithm transforms the surface points and their normals and projects them into the view plane.

关键词： data processing Algorithm development data communications Raster graphics Transform theory 3D displays Medical imaging Volume rendering Computer graphics Computer science

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visual-PERCEPTION OF RETROREFLECTIVE OBJECTS THROUGH LIGHT-SCATTERING MEDIA 2

VISUAL-PERCEPTION OF RETROREFLECTIVE OBJECTS THROUGH LIGHT-S...

引用

conference on visual data exploration and analysis ii

作者： BARUN, VV BELARUS ACAD SCI INST PHYS SCATTERING MEDIA OPT LAB MINSK 220072 BELARUS

ISBN: (纸本)0819417572

Vision characteristics are covered by the image transfer theory. But up to now, it dealt mainly with observation of Lambertian (i.e., diffuse-reflecting) objects on a Lambertian background. This model of reflection is quite a reasonable one for many natural and artificial objects to describe vision quality. This paper presents the mathematical description for vision criteria of another class of objects-retroreflectors to permit their angular patterns of reflection to be dealt with under unfavorable observation conditions through a light-scattering medium, such as fog. the small-angle diffusion approximation is used for the calculations of light characteristics under illumination by some source of an active vision system. by way of examples, there will be considered two questions: (1) visual perception of large-area objects where some parts of a retroreflector can be seen as dark and others as bright ones. This fact may be important when analyzing and exploring visual information being read out from a retroreflective panel. (2) The interesting effect of enhancing the contrast of a retroreflector image with increasing optical thickness of a scattering medium. This is related to increasing 'effective' albedo of an 'equivalent' Lambertian object the retroreflector can be replaced by. The results on vision characteristics of retroreflective objects are compared with those for the case of observation of Lambertian ones. The corresponding differences are discussed.

关键词： RETROREFLECTOR LAMBERTIAN REFLECTOR VIEWING MULTIPLE SCATTERING CONTRAST ACTIVE VISION SYSTEM

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GENERATION OF 3D GEOMETRIC MODELS FROM UNSTRUCTURED 3D POINTS 2

GENERATION OF 3D GEOMETRIC MODELS FROM UNSTRUCTURED 3D POINT...

引用

conference on visual data exploration and analysis ii

作者： HOPPE, H MICROSOFT CORP REDMONDWA 98052

ISBN: (纸本)0819417572

Devices such as videocameras, VCRs, microphones, and fax machines have had a great impact on society because they allow various aspects of the physical world to be acquired, stored, transmitted, and reinstantiated. An important physical form that has received little attention is that of 3D shape. Emerging technologies allowing the acquisition and reinstantiation of 3D shape (3D laser scanners and solid freeform fabrication) are motivating numerous applications, including reverse engineering, traditional non-CAD design, and 3D faxing. However, for 3D scanning to realize its full potential, software must be developed to allow the reconstruction of useful 3D geometric models from the raw data that scanners produce. This work addresses surface reconstruction: the recovery of concise, accurate piecewise smooth surface models from scanned 3D points. We present a surface reconstruction method that is significantly more general than previous ones. Neither the topological type of the surface, its geometry, nor the location of its sharp features are known in advance -- all are inferred from the data points. A key ingredient is the introduction of a new class of subdivision surfaces allowing the representation of sharp features such as creases and corners. Finally, we demonstrate the effectiveness of the method using both simulated and real data.

关键词： SURFACE RECONSTRUCTION SURFACE FITTING SHAPE RECOVERY RANGE data analysis SUBDIVISION SURFACES

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CLIMATE SIMULATION AND data visualIZATION USING SUPERCOMPUTERS AND WORKSTATIONS 2

CLIMATE SIMULATION AND DATA VISUALIZATION USING SUPERCOMPUTE...

引用

conference on visual data exploration and analysis ii

作者： CHEN, PC FUJITSU AMER INC SAN JOSECA 95134

ISBN: (纸本)0819417572

Vision characteristics are covered by the image transfer theory. But up to now, it dealt mainly with observation of Lambertian (i.e., diffuse reflecting) objects on a Lambertian background. This model of reflection is quite a reasonable one for many natural and artificial objects to describe vision quality. This paper presents the mathematical description for vision criteria of another class of objects--retroreflectors to permit their angular patterns of reflection to be dealt with under unfavorable observation conditions through a light-scattering medium such as fog. The small-angle diffusion approximation is used for the calculations of light characteristics under illumination by some source of an active vision system. By way of examples, there will be considered two questions: (1) visual perception of large-are objects where some parts of a a retroreflector can be seen as dark and others as bright ones. This fact may be important when analyzing and exploring visual information being read out from a retroreflective panel. (2) The interesting effect of enhancing the contrast of a retroreflector image with increasing optical thickness of a scattering medium. This is related to increasing 'effective' albedo of an 'equivalent' lambertian object the retroreflector can be replaced by. The results on vision characteristics of retroreflective objects are compared with those for the case of observation of Lambertian ones. the corresponding differences are discussed.

关键词： SCIENTIFIC visualIZATION CLIMATE SIMULATION SUPERCOMPUTING

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Interactive exploration of dynamical systems 2

Interactive exploration of dynamical systems

引用

visual data exploration and analysis ii 1995

作者： Gröller, Eduard Technical University of Vienna Institute of Computer Graphics Karlsplatz 13/186/2 ViennaA-1040 Austria

Nonlinear deterministic dynamical systems often exhibit complex and chaotic behavior which is difficult to comprehend. visualizing the characteristics of such systems is therefore essential for an understanding of the underlying dynamics. In this paper concepts for the interactive graphical exploration of analytically defined dynamical systems are discussed. Emphasis is put on interactivity which shall facilitate the investigation and exploration of such systems. The following topics on dynamical systems are treated in more detail: interactive specification, simple and fast graphical representation, and interactive modification. The paper concentrates on 2D and 3D orthographic projections of higher-dimensional phase spaces and on the display of bifurcation diagrams. A prototype software system which incorporates the previously presented ideas is shortly discussed. The software system is intended to offer a quick insight into the dynamics of a dynamical system and to enable fast investigation of variations of a dynamical system. © 1995 SPIE. All rights reserved.

关键词： Dynamical systems

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Reconstructing and visualizing dense global visual maps for extended passive navigation 2

Reconstructing and visualizing dense global visual maps for ...

引用

visual data exploration and analysis ii 1995

作者： Cui, Yuntao Weng, John Computer Science Department Michigan State University East LansingMI48824 United States

We consider the task of passive navigation, where a stereo visual sensor system moves around an unknown scene. In order to guide an autonomous navigation, it is important to build a visual map which records the location and the shape of the objects in the scene and their world coordinates. The extended global visual map is an integration of local maps. The approach described in this paper integrates the processes of motion estimation, stereo matching, temporal tracking, and Delaunay triangulation interpolation. Through stereo matching, each frame (a stereo image pair) can produce a set of 3D points of current scene. The global structures of these 3D points are obtained using the results of the motion estimation. Delaunay tetrahedralization interpolates three-dimensional data points with a simplicial polyhedral surface. The experiment includes 151 frames of stereo images acquired from the moving mobile robot. © 1995 SPIE. All rights reserved.

关键词： Motion estimation

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SEMIAUTOMATIC 3-D MODEL EXTRACTION FROM UNCALIBRATED 2-D CAMERA VIEWS 2

SEMIAUTOMATIC 3-D MODEL EXTRACTION FROM UNCALIBRATED 2-D CAM...

引用

conference on visual data exploration and analysis ii

作者： BECKER, S BOVE, VM MIT MEDIA LABCAMBRIDGEMA 02139

ISBN: (纸本)0819417572

Scenes that contain every-day man-made objects often possess sets of parallel lines and orthogonal planes, the projective features of which possess enough structural information to constrain possible scene element geometries as well as a camera's intrinsic and extrinsic parameters. In particular, in a scene with three mutually orthogonal sets of parallel lines, detection of the corresponding three vanishing points of the imaged lines allows us to determine the camera's image-relative principal point and effective focal length. In this paper we introduce a new technique to solve for radial and decentering lens distortion directly from the results of vanishing point estimation, thus precluding the need for special calibration templates. This is accomplished by using an iterative method to solve for the parameters that minimize vanishing point dispersion. Dispersion here is measured as covariance of vanishing point estimation error projected on the Gaussian sphere whose origin is the estimated center of projection. Having found a complete model for each camera's intrinsic parameters, corresponding points are used in the relative orientation technique to determine the camera's extrinsic parameters as well as point-wise structure. Surfaces inherit planar geometry and extent from manually identified coplanar lines and points. View independent textures are created for each surface by finding the 2-D homographic texture transformation which corrects for planar perspective foreshortening. We utilize the local Jacobian of this transformation in two important ways: to prevent aliasing in the plane's texture space and to merge correctly texture data arising from varying sampling resolutions in multiple views.

关键词： Cameras Error analysis Calibration Distortion Iterative methods Optical spheres

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Processing three-dimensional human head scan data 2

Processing three-dimensional human head scan data

引用

visual data exploration and analysis ii 1995

作者： Nurre, Joseph H. Department of Electrical and Computer Engineering Ohio University AthensOH45701 United States

Full field surface data of cylindrically shaped objects, such as a human's head, can be acquired by rotating a triangulated laser and imaging system about the subject. The method of acquisition is imperfect and requires post processing of the data obtained. To eliminate rough or irregular surface data, a two-dimensional convolution can be used. To eliminate spikes or impulse noise in the data, morphological filters are available. Proper use of both operations requires knowing and understanding the operational parameters. This paper presents an overview of these methods and discusses the optimal parameter settings as have been determined by experimentation. © 1995 SPIE. All rights reserved.

关键词： Morphology

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