Proceedings Visualization '95

29 Oct.-3 Nov. 1995

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Displaying Results 1 - 25 of 58
  • Interval set: a volume rendering technique generalizing isosurface extraction

    Publication Year: 1995, Page(s):3 - 10
    Cited by:  Papers (16)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    A scalar volume V={(x,f(x))|x/spl isin/R} is described by a function f(x) defined over some region R of the three dimensional space. The paper presents a simple technique for rendering interval sets of the form I/sub g/(a,b)={(x,f(x))|a/spl les/g(x)/spl les/b}, where a and b are either real numbers of infinities. We describe an algorithm for triangulating interval sets as /spl alpha/ shapes, which... View full abstract»

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  • Interactive maximum projection volume rendering

    Publication Year: 1995, Page(s):11 - 18
    Cited by:  Papers (20)  |  Patents (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (974 KB)

    Maximum projection is a volume rendering technique that, for each pixel, finds the maximum intensity along a projector. For certain important classes of data, this is an approximation to summation rendering which produces superior visualizations. We show how maximum projection rendering with additional depth cues can be implemented using simple affine transformations in object space. This techniqu... View full abstract»

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  • Interactive realism for visualization using ray tracing

    Publication Year: 1995, Page(s):19 - 26
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1223 KB)

    Visual realism is necessary for many virtual reality applications. In order to convince the user that the virtual environment is real, the scene presented should faithfully model the expected actual environment. A highly accurate, fully modeled, interactive environment is thus seen as "virtually real". The paper addresses the problem of interactive visual realism and discusses a possible solution:... View full abstract»

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  • A hardware acceleration method for volumetric ray tracing

    Publication Year: 1995, Page(s):27 - 34
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1359 KB)

    We present an acceleration method for volumetric ray tracing which utilizes standard graphics hardware without compromising image accuracy. The graphics hardware is employed to identify those segments of each ray that could possibly contribute to the final image. A volumetric ray tracing algorithm is then used to compute the final image, traversing only the identified segments of the rays. This te... View full abstract»

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  • Defining, computing, and visualizing molecular interfaces

    Publication Year: 1995, Page(s):36 - 43
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1090 KB)

    A parallel, analytic approach for defining and computing the inter and intra molecular interfaces in three dimensions is described. The molecular interface surfaces are derived from approximations to the power diagrams over the participating molecular units. For a given molecular interface our approach can generate a family of interface surfaces parametrized by /spl alpha/ and /spl beta/, where /s... View full abstract»

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  • Visualization of biological sequence similarity search results

    Publication Year: 1995, Page(s):44 - 51
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (2368 KB)

    Biological sequence similarity analysis presents visualization challenges, primarily because of the massive amounts of discrete, multi dimensional data. Genomic data generated by molecular biologists is analyzed by algorithms that search for similarity to known sequences in large genomic databases. The output from these algorithms can be several thousand pages of text, and is difficult to analyze ... View full abstract»

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  • Enhancing transparent skin surfaces with ridge and valley lines

    Publication Year: 1995, Page(s):52 - 59
    Cited by:  Papers (59)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1222 KB)

    There are many applications that can benefit from the simultaneous display of multiple layers of data. The objective in these cases is to render the layered surfaces in a such way that the outer structures can be seen and seen through at the same time. The paper focuses on the particular application of radiation therapy treatment planning, in which physicians need to understand the three dimension... View full abstract»

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  • Splatting of curvilinear volumes

    Publication Year: 1995, Page(s):61 - 68
    Cited by:  Papers (12)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    The paper presents a splatting algorithm for volume rendering of curvilinear grids. A stochastic sampling technique called Poisson sphere/ellipsoid sampling is employed to adaptively resample a curvilinear grid with a set of randomly distributed points whose energy support extents are well approximated by spheres and ellipsoids. Filter kernels corresponding to these spheres and ellipsoids are used... View full abstract»

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  • On enhancing the speed of splatting with indexing

    Publication Year: 1995, Page(s):69 - 76
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (990 KB)

    Splatting is an object space direct volume rendering algorithm that produces images of high quality, but is computationally expensive like many other volume rendering algorithms. The paper presents a new technique that enhances the speed of splatting without trading off image quality. This new method reduces rendering time by employing a simple indexing mechanism which allows to visit and splat on... View full abstract»

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  • IFS fractal interpolation for 2D and 3D visualization

    Publication Year: 1995, Page(s):77 - 84
    Cited by:  Papers (18)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1143 KB)

    Reconstruction is used frequently in visualization of one, two, and three dimensional data. Data uncertainty is typically ignored, and a deficiency of many interpolation schemes is smoothing which may indicate features or characteristics of the data that are not there. The author investigates the use of iterated function systems (IFS's) for interpolation. He shows new derivations for fractal inter... View full abstract»

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  • Automated generation of visual simulation databases using remote sensing and GIS

    Publication Year: 1995, Page(s):86 - 93
    Cited by:  Papers (8)  |  Patents (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1278 KB)

    This paper reports on the development of a strategy to generate databases used for real-time interactive landscape visualization. The database construction from real world data is intended to be as automated as possible. The primary sources of information are remote sensing imagery recorded by Landsat's Thematic Mapper (TM) and digital elevation models (DEM). Additional datasets (traffic networks ... View full abstract»

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  • Virtual GIS: a real-time 3D geographic information system

    Publication Year: 1995, Page(s):94 - 100
    Cited by:  Papers (33)  |  Patents (51)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1106 KB)

    Advances in computer graphics hardware and algorithms, visualization, and interactive techniques for analysis offer the components for a highly integrated, efficient real-time 3D Geographic Information System. We have developed "Virtual GIS", a system with truly immersive capability for navigating and understanding complex and dynamic terrain-based databases. The system provides the means for visu... View full abstract»

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  • An architecture for retaining and analyzing visual explorations of databases

    Publication Year: 1995, Page(s):101 - 108
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1102 KB)

    A software architecture is presented to integrate a database management system with data visualization. One of its primary objectives, the retention of user-data interactions, is detailed. By storing all queries over the data along with high-level descriptions of the query results and the associated visualization, the processes by which a database is explored can be analyzed. This approach can lea... View full abstract»

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  • An illustrated analysis of sonification for scientific visualisation

    Publication Year: 1995, Page(s):110 - 117
    Cited by:  Papers (26)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1213 KB)

    This paper presents an analysis of progress in the use of sound as a tool in support of visualisation and gives an insight into its development and future needs. Special emphasis is given to the use of sound in scientific and engineering applications. A system developed to support surface data presentation and interaction by using sound is presented and discussed. View full abstract»

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  • A rule-based tool for assisting colormap selection

    Publication Year: 1995, Page(s):118 - 125
    Cited by:  Papers (68)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1896 KB)

    The paper presents an interactive approach for guiding the user's select of colormaps in visualization. PRAVDAColor, implemented as a module in the IBM Visualization Data Explorer, provides the user a selection of appropriate colormaps given the data type and spatial frequency, the user's task, and properties of the human perceptual system. View full abstract»

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  • Space walking [topological manifold visualization]

    Publication Year: 1995, Page(s):126 - 133
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1243 KB)

    Proposes an interactive method for exploring topological spaces based on the natural local geometry of the space. Examples of spaces appropriate for this visualization approach occur in abundance in mathematical visualization, surface and volume visualization problems, and scientific applications such as general relativity. Our approach is based on using a controller to choose a direction in which... View full abstract»

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  • Fast multiresolution surface meshing

    Publication Year: 1995, Page(s):135 - 142
    Cited by:  Papers (39)  |  Patents (16)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1521 KB)

    Presents a new method for adaptive surface meshing and triangulation which controls the local level-of-detail of the surface approximation by local spectral estimates. These estimates are determined by a wavelet representation of the surface data. The basic idea is to decompose the initial data set by means of an orthogonal or semi-orthogonal tensor product wavelet transform (WT) and to analyze th... View full abstract»

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  • Sweeping simplices: a fast iso-surface extraction algorithm for unstructured grids

    Publication Year: 1995, Page(s):143 - 150
    Cited by:  Papers (31)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1354 KB)

    Presents an algorithm that accelerates the extraction of iso-surfaces from unstructured grids by avoiding the traversal of the entire set of cells in the volume. The algorithm consists of a sweep algorithm and a data decomposition scheme. The sweep algorithm incrementally locates intersected elements, and the data decomposition scheme restricts the algorithm's worst-case performance. For data sets... View full abstract»

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  • Interval volume: a solid fitting technique for volumetric data display and analysis

    Publication Year: 1995, Page(s):151 - 158
    Cited by:  Papers (20)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1307 KB)

    Proposes as a generalization of isosurfaces, the 'interval volume', which is a new type of geometric model representing 3D subvolumes with field values belonging to a closed interval. A dominant surface fitting algorithm called 'marching cubes' is extended to obtain a solid fitting algorithm, which extracts from a given volumetric dataset a high-resolution polyhedral solid data structure of the in... View full abstract»

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  • Fast normal estimation using surface characteristics

    Publication Year: 1995, Page(s):159 - 166
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1237 KB)

    To visualize the volume data acquired from computation or sampling, it is necessary to estimate normals at the points corresponding to object surfaces. Volume data does not holds the geometric information for the surface comprising points, so it is necessary to calculate normals using local information at each point. The existing normal estimation methods have some problems of estimating incorrect... View full abstract»

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  • Compression domain rendering of time-resolved volume data

    Publication Year: 1995, Page(s):168 - 175
    Cited by:  Papers (28)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1238 KB)

    An important challenge in the visualization of three-dimensional volume data is the efficient processing and rendering of time-resolved sequences. Only the use of compression techniques, which allow the reconstruction of the original domain from the compressed one locally, makes it possible to evaluate these sequences in their entirety. In this paper, a new approach for the extraction and visualiz... View full abstract»

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  • High-speed volume rendering using redundant block compression

    Publication Year: 1995, Page(s):176 - 183
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1540 KB)

    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. ... View full abstract»

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  • Authenticity analysis of wavelet approximations in visualization

    Publication Year: 1995, Page(s):184 - 191
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    Wavelet transforms include data decompositions and reconstructions. This paper is concerned with the authenticity issues of the data decomposition, particularly for data visualization. A total of six datasets are used to clarify the approximation characteristics of compactly supported orthogonal wavelets. We present an error tracking mechanism, which uses the available wavelet resources to measure... View full abstract»

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  • Direct rendering of Laplacian pyramid compressed volume data

    Publication Year: 1995, Page(s):192 - 199
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1073 KB)

    Volume rendering generates 2D images by ray tracing 3D volume data. This technique imposes considerable demands on storage space as the data set grows in size. In this paper, we describe a method to render compressed volume data directly to reduce the memory requirements of the rendering process. The volume data was compressed by a technique called the Laplacian pyramid. A compression ratio of 10:... View full abstract»

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  • Automatic generation of triangular irregular networks using greedy cuts

    Publication Year: 1995, Page(s):201 - 208
    Cited by:  Papers (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1183 KB)

    Proposes a new approach to the automatic generation of triangular irregular networks (TINs) from dense terrain models. We have developed and implemented an algorithm based on the greedy principle used to compute minimum-link paths in polygons. Our algorithm works by taking greedy cuts ("bites") out of a simple closed polygon that bounds the yet-to-be triangulated region. The algorithm starts with ... View full abstract»

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