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Oct. 27 2002-Nov. 1 2002

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Displaying Results 1 - 25 of 80
  • VIS2002. IEEE Visualization 2002. Proceedings (Cat. No.02CH37370)

    Publication Year: 2002
    Request permission for commercial reuse | PDF file iconPDF (207 KB)
    Freely Available from IEEE
  • Integration of measurement tools in medical 3d visualizations

    Publication Year: 2002, Page(s):21 - 28
    Cited by:  Papers (7)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3689 KB) | HTML iconHTML

    We discuss 3d interaction techniques for the quantitative analysis of spatial relations in medical visualizations. We describe the design and implementation of measurement tools to measure distances, angles and volumes in 3d visualizations. The visualization of measurement tools as recognizable 3d objects and a 3d interaction, which is both intuitive and precise, determines the usability of such f... View full abstract»

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  • Fast visualization of plane-like structures in voxel data

    Publication Year: 2002, Page(s):29 - 36
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1200 KB) | HTML iconHTML

    We present a robust, noise-resistant criterion characterizing plane-like skeletons in binary voxel objects. It is based on a distance map and the geodesic distance along the object's boundary. A parameter allows us to control the noise sensitivity. If needed, homotopy with the original object might be reconstructed in a second step, using an improved distance ordered thinning algorithm. The skelet... View full abstract»

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  • CPR - curved planar reformation

    Publication Year: 2002, Page(s):37 - 44
    Cited by:  Papers (37)  |  Patents (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2213 KB) | HTML iconHTML

    Visualization of tubular structures such as blood vessels is an important topic in medical imaging. One way to display tubular structures for diagnostic purposes is to generate longitudinal cross-sections in order to show their lumen, wall, and surrounding tissue in a curved plane. This process is called curved planar reformation (CPR). We present three different methods to generate CPR images. A ... View full abstract»

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  • Direct surface extraction from 3D freehand ultrasound images

    Publication Year: 2002, Page(s):45 - 52
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1053 KB) | HTML iconHTML

    This paper presents a new technique for the extraction of surfaces from 3D ultrasound data. Surface extraction from ultrasound data is challenging for a number of reasons including noise and artifacts in the images and nonuniform data sampling. A method is proposed to fit an approximating radial basis function to the group of data samples. An explicit surface is then obtained by iso-surfacing the ... View full abstract»

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  • Interactive rendering of large volume data sets

    Publication Year: 2002, Page(s):53 - 60
    Cited by:  Papers (57)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3114 KB) | HTML iconHTML

    We present a new algorithm for rendering very large volume data sets at interactive frame rates on standard PC hardware. The algorithm accepts scalar data sampled on a regular grid as input. The input data is converted into a compressed hierarchical wavelet representation in a preprocessing step. During rendering, the wavelet representation is decompressed on-the-fly and rendered using hardware te... View full abstract»

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  • Semotus Visum: a flexible remote visualization framework

    Publication Year: 2002, Page(s):61 - 68
    Cited by:  Papers (26)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (590 KB) | HTML iconHTML

    By offering more detail and precision, large data sets can provide greater insights to researchers than small data sets. However, these data sets require greater computing resources to view and manage. Remote visualization techniques allow the use of computers that cannot be operated locally. The Semotus Visum framework applies a high-performance client-server paradigm to the problem. The framewor... View full abstract»

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  • Out-of-core rendering of massive geometric environments

    Publication Year: 2002, Page(s):69 - 76
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (705 KB) | HTML iconHTML

    We present an external memory algorithm for fast display of very large and complex geometric environments. We represent the model using a scene graph and employ different culling techniques for rendering acceleration. Our algorithm uses a parallel approach to render the scene as well as fetch objects from the disk in a synchronous manner. We present a novel prioritized prefetching technique that t... View full abstract»

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  • Optimized view-dependent rendering for large polygonal datasets

    Publication Year: 2002, Page(s):77 - 84
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1402 KB) | HTML iconHTML

    In this paper we are presenting a novel approach for rendering large datasets in a view-dependent manner. In a typical view-dependent rendering framework, an appropriate level of detail is selected and sent to the graphics hardware for rendering at each frame. In our approach, we have successfully managed to speed up the selection of the level of detail as well as the rendering of the selected lev... View full abstract»

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  • Volumetric shadows using splatting

    Publication Year: 2002, Page(s):85 - 92
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (781 KB) | HTML iconHTML

    This paper describes an efficient algorithm to model the light attenuation due to a participating media with low albedo. The light attenuation is modeled using splatting volume renderer for both the viewer and the light source. During the rendering, a 2D shadow buffer attenuates the light for each pixel. When the contribution of a footprint is added to the image buffer, as seen from the eye, we ad... View full abstract»

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  • Volume clipping via per-fragment operations in texture-based volume visualization

    Publication Year: 2002, Page(s):93 - 100
    Cited by:  Papers (15)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2536 KB) | HTML iconHTML

    We propose new clipping methods that are capable of using complex geometries for volume clipping. The clipping tests exploit per-fragment operations on the graphics hardware to achieve high frame rates. In combination with texture-based volume rendering, these techniques enable the user to interactively select and explore regions of the data set. We present depth-based clipping techniques that ana... View full abstract»

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  • Interactive spectral volume rendering

    Publication Year: 2002, Page(s):101 - 108
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3902 KB) | HTML iconHTML

    We describe a method for volume rendering using a spectral representation of colour instead of the traditional RGB model. It is shown how to use this framework for a novel exploration of datasets through enhanced transfer function design. Furthermore, our framework is extended to allow real-time re-lighting of the scene created with any rendering method. The technique of post-illumination is intro... View full abstract»

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  • Interactive translucent volume rendering and procedural modeling

    Publication Year: 2002, Page(s):109 - 116
    Cited by:  Papers (31)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (838 KB) | HTML iconHTML

    Direct volume rendering is a commonly used technique in visualization applications. Many of these applications require sophisticated shading models to capture subtle lighting effects and characteristics of volumetric data and materials. Many common objects and natural phenomena exhibit visual quality that cannot be captured using simple lighting models or cannot be solved at interactive rates usin... View full abstract»

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  • A multiphase approach to efficient surface simplification

    Publication Year: 2002, Page(s):117 - 124
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1505 KB) | HTML iconHTML

    We present a new multiphase method for efficiently simplifying polygonal surface models of arbitrary size. It operates by combining an initial out-of-core uniform clustering phase with a subsequent in-core iterative edge contraction phase. These two phases are both driven by quadric error metrics, and quadrics are used to pass information about the original surface between phases. The result is a ... View full abstract»

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  • Geometric surface smoothing via anisotropic diffusion of normals

    Publication Year: 2002, Page(s):125 - 132
    Cited by:  Papers (54)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2164 KB) | HTML iconHTML

    This paper introduces a method for smoothing complex, noisy surfaces, while preserving (and enhancing) sharp, geometric features. It has two main advantages over previous approaches to feature preserving surface smoothing. First is the use of level set surface models, which allows us to process very complex shapes of arbitrary and changing topology. This generality makes it well suited for process... View full abstract»

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  • TetFusion: an algorithm for rapid tetrahedral mesh simplification

    Publication Year: 2002, Page(s):133 - 140
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1537 KB) | HTML iconHTML

    This paper introduces an algorithm for rapid progressive simplification of tetrahedral meshes: TetFusion. We describe how a simple geometry decimation operation steers a rapid and controlled progressive simplification of tetrahedral meshes, while also taking care of complex mesh-inconsistency problems. The algorithm features a high decimation ratio per step, and inherently discourages any cases of... View full abstract»

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  • Compressing polygon mesh geometry with parallelogram prediction

    Publication Year: 2002, Page(s):141 - 146
    Cited by:  Papers (21)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2580 KB) | HTML iconHTML

    We present a generalization of the geometry coder by Touma and Gotsman (1998) to polygon meshes. We let the polygon information dictate where to apply the parallelogram rule that they use to predict vertex positions. Since polygons tend to be fairly planar and fairly convex, it is beneficial to make predictions within a polygon rather than across polygons. This, for example, avoids poor prediction... View full abstract»

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  • Probabilistic surfaces: point based primitives to show surface uncertainty

    Publication Year: 2002, Page(s):147 - 153
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1199 KB) | HTML iconHTML

    Efficient and informative visualization of surfaces with uncertainties is an important topic with many applications in science and engineering. Examples include environmental pollution borderline identification, identification of the limits of an oil basin, or discrimination between contaminated and healthy tissue in medicine. This paper presents an approach for such visualization using points as ... View full abstract»

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  • PMR: point to mesh rendering, a feature-based approach

    Publication Year: 2002, Page(s):155 - 162
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3605 KB) | HTML iconHTML

    Within the field of computer graphics and visualization, it is often necessary to visualize polygonal models with large number of polygons. Display quality is mandatory, but it is also desirable to have the ability to rapidly update the display in order to facilitate interactive use. Point based rendering methods have been shown effective for this task. Building on this paradigm we introduce the P... View full abstract»

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  • Efficient simplification of point-sampled surfaces

    Publication Year: 2002, Page(s):163 - 170
    Cited by:  Papers (172)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8230 KB) | HTML iconHTML

    We introduce, analyze and quantitatively compare a number of surface simplification methods for point-sampled geometry. We have implemented incremental and hierarchical clustering, iterative simplification, and particle simulation algorithms to create approximations of point-based models with lower sampling density. All these methods work directly on the point cloud, requiring no intermediate tess... View full abstract»

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  • Exploring scalar fields using critical isovalues

    Publication Year: 2002, Page(s):171 - 178
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2350 KB) | HTML iconHTML

    Isosurfaces are commonly used to visualize scalar fields. Critical isovalues indicate isosurface topology changes: the creation of new surface components, merging of surface components or the formation of holes in a surface component. Therefore, they highlight interesting isosurface behavior and are helpful in exploration of large trivariate data sets. We present a method that detects critical iso... View full abstract»

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  • Level set segmentation from multiple non-uniform volume datasets

    Publication Year: 2002, Page(s):179 - 186
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB) | HTML iconHTML

    Typically 3-D MR and CT scans have a relatively high resolution in the scanning X-Y plane, but much lower resolution in the axial Z direction. This non-uniform sampling of an object can miss small or thin structures. One way to address this problem is to scan the same object from multiple directions. In this paper we describe a method for deforming a level set model using velocity information deri... View full abstract»

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  • Efficient computation of the topology of level sets

    Publication Year: 2002, Page(s):187 - 194
    Cited by:  Papers (19)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (749 KB) | HTML iconHTML

    This paper introduces two efficient algorithms that compute the Contour Tree of a 3D scalar field ℱ and its augmented version with the Betti numbers of each isosurface. The Contour Tree is a fundamental data structure in scientific visualization that is used to preprocess the domain mesh to allow optimal computation of isosurfaces with minimal overhead storage. The Contour Tree can also be us... View full abstract»

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  • Fast and reliable space leaping for interactive volume rendering

    Publication Year: 2002, Page(s):195 - 202
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB) | HTML iconHTML

    We present a fast and reliable space-leaping scheme to accelerate ray casting during interactive navigation in a complex volumetric scene, where we combine innovative space-leaping techniques in a number of ways. First, we derive most of the pixel depths at the current frame by exploiting the temporal coherence during navigation, where we employ a novel fast cell-based reprojection scheme that is ... View full abstract»

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  • A new object-order ray-casting algorithm

    Publication Year: 2002, Page(s):203 - 210
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2341 KB) | HTML iconHTML

    Many direct volume rendering algorithms have been proposed during the last decade to render 2563 voxels interactively. However a lot of limitations are inherent to all of them, like low-quality images, a small viewport size or a fixed classification. In contrast, interactive high quality algorithms are still a challenge nowadays. We introduce here an efficient and accurate technique cal... View full abstract»

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