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Proceedings The Fifth Pacific Conference on Computer Graphics and Applications

13-16 Oct. 1997

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Displaying Results 1 - 24 of 24
  • Pacific Graphics '97 [front matter]

    Publication Year: 1997, Page(s):i - vii
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    Freely Available from IEEE
  • Index of authors

    Publication Year: 1997, Page(s): 225
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    Freely Available from IEEE
  • Vortex flow visualization using tetrahedral cell subdivision

    Publication Year: 1997, Page(s):206 - 215, 224
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1068 KB)

    Proposes an effective technique for searching for critical points, which are points at which the velocity vector is zero. The previous method, using tetrahedral-cell subdivision, often generates multiple critical points in a hexahedral cell, and this causes several defects in flow visualization. First, we propose a new criterion for differences between interpolation functions, and investigate the ... View full abstract»

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  • Fast color fiducial detection and dynamic workspace extension in video see-through self-tracking augmented reality

    Publication Year: 1997, Page(s):168 - 177, 222
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1200 KB)

    The registration problem is one of the major issues in augmented reality (AR). Fiducial tracking is gaining interest as a solution to this problem in video see-through AR because of the availability of digitized real scenes. There are several AR systems using fiducial tracking, but most of them operate in small desktop workspaces. It is difficult to apply them directly to large scale applications.... View full abstract»

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  • Multi-functional visualization system for structure analysis

    Publication Year: 1997, Page(s):198 - 205, 223
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1804 KB)

    For displaying structure analysis data on demand, we propose a multi-functional visualization system with a sophisticated graphical user interface (GUI) that reflects the observer's intention interactively and is adapted to further extension. In this system, the analysis results can be expressed in various ways by interactive operations: corresponding to the user's tentative demands, multiple phys... View full abstract»

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  • Hierarchical techniques for global illumination computations-recent trends and developments

    Publication Year: 1997, Page(s):80 - 89
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    Since the beginning of computer graphics, one of the primary goals has been to create convincingly realistic images of three-dimensional environments that would be impossible to distinguish from photographs of the real scene. The goal to create photo-realistic images has lead to the development of completely new software techniques for dealing with the inherent geometric and optical complexity of ... View full abstract»

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  • SharedWeb-a shared virtual environment over World Wide Web

    Publication Year: 1997, Page(s):178 - 189
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1268 KB)

    Describes the design implementation and experimental results for a multi-user 3D World Wide Web (WWW) browsing system called SharedWeb, which is based on the request-response method of a WWW server. The key features of this system include: (i) the WWW server's ability to remember all the browsers connected to it in order to transmit those messages required to maintain consistent states among the b... View full abstract»

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  • Novel multiresolution metrics for content-based image retrieval

    Publication Year: 1997, Page(s):105 - 114
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    This paper proposes three new ideas and one revision concerning image metrics and their applications. Of most importance is the multiresolution shape metric, which measures distances according to image content shape information. Accompanied with it is a feature/non-feature image characterization philosophy. The second effort is the modification of an existing color metric, whose distance computati... View full abstract»

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  • 3D geometric metamorphosis based on harmonic map

    Publication Year: 1997, Page(s):97 - 104
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Recently, animations with deforming objects are frequently used in various computer graphics applications. Metamorphosis (or morphing) of three dimensional objects can realize a shape transformation between two or more existing objects. We present a new algorithm for 3D geometric metamorphosis between two objects based on the harmonic map. Our algorithm is applicable for arbitrary polyhedra that a... View full abstract»

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  • Illuminating image-based objects

    Publication Year: 1997, Page(s):69 - 78, 219
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1276 KB)

    We present a new scheme of data representation for image-based objects. It allows the illumination to be changed interactively without knowing any geometrical information (e.g. depth or surface normal) of the scene, but the resulting images are physically correct. The scene is first sampled from different view points and under different illuminations. By treating each pixel on the image plane as a... View full abstract»

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  • Modification of n-sided patches based on variation of blending functions

    Publication Year: 1997, Page(s):91 - 96, 220
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    By introducing the edge-based blending function, derived from the surface-based function, we can capture the effects of the edges on the shape of the n-sided patch more directly. Designers can manipulate the edge-based blending function, as well as the geometry of the boundary curves, to design and modify the patch shape. We discuss the derivation of the edge-based blending function, the ease of d... View full abstract»

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  • Virtual Stage: a scenario-based karaoke system in a virtual environment

    Publication Year: 1997, Page(s):159 - 167
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    We describe our on-going work on Virtual Stage, a karaoke system which incorporates virtual reality technology. A runtime environment and authoring tools for interactive scenarios have been designed and implemented. We adopt a scenario-based representation to unfold a story in the virtual environment. A producer can make Virtual Stage applications which reflect his/her own scenario. While singing-... View full abstract»

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  • Incremental view-dependent multiresolution triangulation of terrain

    Publication Year: 1997, Page(s):127 - 136
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1540 KB)

    A view-dependent multiresolution triangulation algorithm is presented for a real-time flythrough. The triangulation of the terrain is generated incrementally on-the-fly during the rendering time. We show that since the view changes smoothly only a few incremental modifications are required to update the triangulation to a new view. The resulting triangles form a multiresolution Delaunay triangulat... View full abstract»

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  • Rendering in object interference detection on conventional graphics workstations

    Publication Year: 1997, Page(s):51 - 58, 218
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1276 KB)

    Collision detection between complex objects using rasterizing graphics hardware provides a rich ground of exploration for speeding up the interference detection algorithms and computing points of collision. We show that despite the limitations imposed by the current graphics rendering hardware, it is still possible to perform collision detection at rendering rates using only conventional graphics ... View full abstract»

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  • Template-based rendering of run-length encoded volumes

    Publication Year: 1997, Page(s):138 - 147
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    Template-based volume rendering is an acceleration technique for volume ray casting. It does not trade-off the image quality for the rendering speed. However, it still falls short of interactive manipulation of volume data, mainly due to the ray-by-ray volume access pattern and the long ray path in the transparent regions. In this paper, we present an object-order template-based volume rendering m... View full abstract»

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  • Fast volume rendering using adaptive block subdivision

    Publication Year: 1997, Page(s):148 - 157, 221
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    We propose a fast volume rendering scheme that greatly reduces ray-casting overheads by adaptive block subdivision. We first apply a uniform space subdivision for constructing the adaptively subdivided volume. Then we merge coherent uniform blocks to generate adaptive-sized blocks that are efficient for leaping space. To accomplish this, an efficient block merging algorithm based on a boundary fol... View full abstract»

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  • Rendering of spherical light fields

    Publication Year: 1997, Page(s):59 - 68
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1220 KB)

    A plenoptic function is a parameterized function describing the flow of light in space, and has served as a key idea in building some of the recent image based rendering systems. The paper presents a new representation scheme, called a spherical light field, of the plenoptic function, that is based on spheres. While methods using spherical coordinates are thought to require substantially more comp... View full abstract»

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  • Real-time virtual humans

    Publication Year: 1997, Page(s):4 - 13
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    The last few years have seen great maturation in the computation speed and control methods needed to portray 3D virtual humans that are suitable for real interactive applications. We first describe the state of the art, then focus on the particular approach taken at the University of Pennsylvania with the Jack system. Various aspects of real-time virtual humans are considered, such as their appear... View full abstract»

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  • “Skeleton climbing”: fast isosurfaces with fewer triangles

    Publication Year: 1997, Page(s):117 - 126
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1600 KB)

    Skeleton climbing is an algorithm that builds triangulated isosurfaces in 3D grid data, more economically than marching cubes, and without the time penalty of current mesh decimation algorithms. Building the surface from its intersections with grid edges (1-skeleton), then faces (2-skeleton), then cubes (3-skeleton), treats the data in a uniform way; this allows a 25% reduction in the number of tr... View full abstract»

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  • Live participant's action recognition for virtual reality interactions

    Publication Year: 1997, Page(s):15 - 21
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (884 KB)

    The recognition of daily human activities is a decisive interface component for more intuitive virtual reality (VR) interactions. In this paper, we describe a hierarchical model of body actions based on fine-grained action primitives. The associated recognition algorithm allows on-the-fly identification of simultaneous actions. Measurements highlight robustness to participants' variability and hig... View full abstract»

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  • Dynamic process management for avoiding the confliction between the development of a program and a job for producing animation frames

    Publication Year: 1997, Page(s):23 - 29
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    Distributed processing systems which consist of multiple graphics workstations (GWSs) are being used in many computer graphics laboratories (CG labs). This paper proposes a method for improving the operation efficiency at a CG lab by avoiding the conflict between a job for producing animation frames with no human interaction and the development of a program which needs some interaction by a human.... View full abstract»

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  • A visualization environment for electron microscopy

    Publication Year: 1997, Page(s):191 - 197
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    Describes an environment for visualization and processing of low-dose, low-contrast electron micrographs of biological specimens. We focus on image selection, the first step in the process of reconstruction of the 3D structure of a specimen from its projections. Noise from a variety of sources makes automatic detection of particle positions a difficult task. New image acquisition devices and moder... View full abstract»

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  • A 3-D string figure display system for animating cat's cradle game

    Publication Year: 1997, Page(s):30 - 38
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Implements a display system for cat's cradle game animation in 3D. The input to our system, finger actions, originates from a user. Based on this input, we animate the finger actions and display an operated pattern of string figures. A stabilizing procedure is in charge of obtaining a stable state of the string figures. Processing string figures on a computer is difficult, since the string's dynam... View full abstract»

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  • A practitioners' assessment of light reflection models

    Publication Year: 1997, Page(s):40 - 49
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    We discuss the theory and practical issues behind creating reflection models to show the difficulty of the problem. We survey the current approaches towards reflection models for computer graphics to show that even for simple surfaces, the important issues are far from settled. We briefly discuss future directions for research. Finally, we present a case study of a particular type of light reflect... View full abstract»

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