Proceedings. Visualization '97 (Cat. No. 97CB36155)

24-24 Oct. 1997

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  • Proceedings. Visualization '97 (Cat. No. 97CB36155)

    Publication Year: 1997
    Request permission for reuse | PDF file iconPDF (370 KB)
    Freely Available from IEEE
  • A comparison of normal estimation schemes

    Publication Year: 1997, Page(s):19 - 26
    Cited by:  Papers (31)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The task of reconstructing the derivative of a discrete function is essential for its shading and rendering as well as being widely used in image processing and analysis. We survey the possible methods for normal estimation in volume rendering and divide them into two classes based on the delivered numerical accuracy. The three members of the first class determine the normal in two steps by employ... View full abstract»

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  • Collision detection for volumetric objects

    Publication Year: 1997, Page(s):27 - 34
    Cited by:  Papers (12)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    We propose a probability model for the handling of complicated interactions between volumetric objects. In our model each volume is associated with a "probability map" that assigns a "surface crossing" probability to each space point according to local volume properties. The interaction between two volumes is then described by finding the intersecting regions between the volumes, and calculating t... View full abstract»

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  • The VSBUFFER: visibility ordering of unstructured volume primitives by polygon drawing

    Publication Year: 1997, Page(s):35 - 42
    Cited by:  Papers (10)  |  Patents (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (363 KB)

    Different techniques have been proposed for rendering volumetric scalar data sets. Usually these approaches are focusing on orthogonal cartesian grids, but in the last years research did also concentrate on arbitrary structured or even unstructured topologies. In particular, direct volume rendering of these data types is numerically complex and mostly requires sorting the whole database. We presen... View full abstract»

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  • Volume rendering of abdominal aortic aneurysms

    Publication Year: 1997, Page(s):43 - 50
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (501 KB)

    One well known application area of volume rendering is the reconstruction and visualization of output from medical scanners like computed tomography (CT). 2D greyscale slices produced by these scanners can be reconstructed and displayed onscreen as a 3D model. Volume visualization of medical images must address two important issues. First, it is difficult to segment medical scans into individual m... View full abstract»

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  • Auralization of streamline vorticity in computational fluid dynamics data

    Publication Year: 1997, Page(s):51 - 57
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    Presents a new method for auralization of the vorticity of a streamline in a vector field. This technique involves using a composite tone formed by superimposing sine waves of various amplitudes whose frequency and amplitude vary in such a way as to give the perception that the resulting sound increases or decreases endlessly in pitch without ever extending beyond the listener's range of audible f... View full abstract»

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  • Singularities in nonuniform tensor fields

    Publication Year: 1997, Page(s):59 - 66
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (275 KB)

    Studies the topology of 2nd-order symmetric tensor fields. Degenerate points are basic constituents of tensor fields. From the set of degenerate points, an experienced researcher can reconstruct a whole tensor field. We address the conditions for the existence of degenerate points and, based on these conditions, we predict the distribution of degenerate points inside the field. Every tensor can be... View full abstract»

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  • Visualization of higher order singularities in vector fields

    Publication Year: 1997, Page(s):67 - 74
    Cited by:  Papers (18)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (623 KB)

    Presents an algorithm for the visualization of vector field topology based on Clifford algebra. It allows the detection of higher-order singularities. This is accomplished by first analysing the possible critical points and then choosing a suitable polynomial approximation, because conventional methods based on piecewise linear or bilinear approximation do not allow higher-order critical points an... View full abstract»

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  • Principal stream surfaces

    Publication Year: 1997, Page(s):75 - 80
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    The use of stream surfaces and streamlines is well established in vector visualization. However, the proper placement of starting points is critical for these constructs to clearly illustrate the flow topology. In this paper, we present the principal stream surface algorithm, which automatically generates stream surfaces that properly depict the topology of an irrotational flow. For each velocity ... View full abstract»

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  • ROAMing terrain: Real-time Optimally Adapting Meshes

    Publication Year: 1997, Page(s):81 - 88
    Cited by:  Papers (198)  |  Patents (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    Terrain visualization is a difficult problem for applications requiring accurate images of large datasets at high frame rates, such as flight simulation and ground-based aircraft testing using synthetic sensor simulation. On current graphics hardware, the problem is to maintain dynamic, view-dependent triangle meshes and texture maps that produce good images at the required frame rate. We present ... View full abstract»

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  • Visualization of height field data with physical models and texture photomapping

    Publication Year: 1997, Page(s):89 - 94
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    The paper discusses a unique way to visualize height field data-the use of solid fabricated parts with a photomapped texture to display scalar information. In this process, the data in a height field are turned into a 3D solid representation through solid freeform fabrication techniques, in this case laminated object manufacturing. Next, that object is used as a 3D "photographic plate" to allow a ... View full abstract»

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  • Visualization of large terrains in resource-limited computing environments

    Publication Year: 1997, Page(s):95 - 102
    Cited by:  Papers (8)  |  Patents (39)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (982 KB)

    The authors describe a software system supporting interactive visualization of large terrains in a resource-limited environment, i.e. a low-end client computer accessing a large terrain database server through a low-bandwidth network. By "large", they mean that the size of the terrain database is orders of magnitude larger than the computer RAM. Superior performance is achieved by manipulating bot... View full abstract»

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  • Building and traversing a surface at variable resolution

    Publication Year: 1997, Page(s):103 - 110
    Cited by:  Papers (26)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (795 KB)

    The authors consider the multi-triangulation, a general model for representing surfaces at variable resolution based on triangle meshes. They analyse characteristics of the model that make it effective for supporting basic operations such as extraction of a surface approximation, and point location. An interruptible algorithm for extracting a representation at a resolution variable over the surfac... View full abstract»

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  • Multivariate visualization using metric scaling

    Publication Year: 1997, Page(s):111 - 118
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (627 KB)

    The authors present an efficient visualization approach to support multivariate data exploration through a simple but effective low dimensional data overview based on metric scaling. A multivariate dataset is first transformed into a set of dissimilarities between all pairs of data records. A graph configuration algorithm based on principal components is then wed to determine the display coordinat... View full abstract»

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  • Visualizing the behaviour of higher dimensional dynamical systems

    Publication Year: 1997, Page(s):119 - 125
    Cited by:  Papers (17)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    In recent years scientific visualization has been driven by the need to visualize high-dimensional data sets within high-dimensional spaces. However most visualization methods are designed to show only some statistical features of the data set. The paper deals with the visualization of trajectories of high-dimensional dynamical systems which form a L/sub n//sup n/ data set of a smooth n-dimensiona... View full abstract»

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  • Displaying data in multidimensional relevance space with 2D visualization maps

    Publication Year: 1997, Page(s):127 - 134
    Cited by:  Papers (9)  |  Patents (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (209 KB)

    The paper introduces a tool for visualizing a multidimensional relevance space. Abstractly, the information to be displayed consists of a large number of objects, a set of features that are likely to be of interest to the user, and some function that measures the relevance level of every object to the various features. The goal is to provide the user with a concise and comprehensible visualization... View full abstract»

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  • Multiresolution tetrahedral framework for visualizing regular volume data

    Publication Year: 1997, Page(s):135 - 142
    Cited by:  Papers (34)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (314 KB)

    The authors present a multiresolution framework, called Multi-Tetra framework, that approximates volume data with different levels-of-detail tetrahedra. The framework is generated through a recursive subdivision of the volume data and is represented by binary trees. Instead of using a certain level of the Multi-Tetra framework for approximation, an error-based model (EBM) is generated by recursive... View full abstract»

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  • Haar wavelets over triangular domains with applications to multiresolution models for flow over a sphere

    Publication Year: 1997, Page(s):143 - 149
    Cited by:  Papers (23)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    Some new piecewise constant wavelets defined over nested triangulated domains are presented and applied to the problem of multiresolution analysis of flow over a spherical domain. These new, nearly orthogonal wavelets have advantages over the existing weaker biorthogonal wavelets. In the planar case of uniform areas, the wavelets converge to one of two fully orthogonal Haar wavelets. These new, fu... View full abstract»

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  • Wavelet-based multiresolutional representation of computational field simulation datasets

    Publication Year: 1997, Page(s):151 - 158
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (161 KB)

    The paper addresses multiresolutional representation of datasets arising from a computational field simulation. The approach determines the regions of interest, breaks the volume into variable size blocks to localize the information, and then codes each block using a wavelet transform. The blocks are then ranked by visual information content so that the most informative wavelet coefficients can be... View full abstract»

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  • Dynamic color mapping of bivariate qualitative data

    Publication Year: 1997, Page(s):159 - 166
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (435 KB)

    Color is widely and reliably used to display the value of a single scalar variable. It is more rarely, and far less reliably, used to display multivariate data. Dynamic control over the parameters of the color mapping results in a more effective environment for the exploration of multivariate spatial distributions. The paper describes an empirical study comparing the effectiveness of static versus... View full abstract»

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  • The contour spectrum

    Publication Year: 1997, Page(s):167 - 173
    Cited by:  Papers (96)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The authors introduce the contour spectrum, a user interface component that improves qualitative user interaction and provides real-time exact quantification in the visualization of isocontours. The contour spectrum is a signature consisting of a variety of scalar data and contour attributes, computed over the range of scalar values /spl omega//spl isin/R. They explore the use of surface, area, vo... View full abstract»

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  • Constrained 3D navigation with 2D controllers

    Publication Year: 1997, Page(s):175 - 182
    Cited by:  Papers (30)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (278 KB)

    Navigation through 3D spaces is required in many interactive graphics and virtual reality applications. The authors consider the subclass of situations in which a 2D device such as a mouse controls smooth movements among viewpoints for a "through the screen" display of a 3D world. Frequently, there is a poor match between the goal of such a navigation activity, the control device, and the skills o... View full abstract»

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  • Two-phase perspective ray casting for interactive volume navigation

    Publication Year: 1997, Page(s):183 - 189
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1157 KB)

    Volume navigation is the interactive exploration of volume data sets by "flying" the view point through the data, producing a volume rendered view at each frame. The authors present an inexpensive perspective volume navigation method designed to run on a PC platform with accelerated 3D graphics hardware. They compute perspective projections at each frame, allow trilinear interpolation of sample po... View full abstract»

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  • Accelerated volume rendering using homogeneous region encoding

    Publication Year: 1997, Page(s):191 - 196
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Previous accelerated volume rendering techniques have used auxiliary hierarchical datastructures to skip empty and homogeneous regions. Although some recent research has taken advantage of more efficient direct encoding techniques to skip empty regions, no work has been done to directly encode homogeneous but not empty regions. 3D distance transforms previously used to encode empty space can be ex... View full abstract»

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  • An anti-aliasing technique for splatting

    Publication Year: 1997, Page(s):197 - 204
    Cited by:  Papers (17)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    Splatting is a popular direct volume rendering algorithm. However, the algorithm does not correctly render cases where the volume sampling rate is higher than the image sampling rate (e.g. more than one voxel maps into a pixel). This situation arises with orthographic projections of high-resolution volumes, as well as with perspective projections of volumes of any resolution. The result is potenti... View full abstract»

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