Proceedings. Seventh Pacific Conference on Computer Graphics and Applications (Cat. No.PR00293)

7-7 Oct. 1999

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  • Proceedings. Seventh Pacific Conference on Computer Graphics and Applications (Cat. No.PR00293)

    Publication Year: 1999
    Request permission for reuse | PDF file iconPDF (221 KB)
    Freely Available from IEEE
  • Science of computer graphics

    Publication Year: 1999, Page(s):2 - 3
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (101 KB)

    Computer graphics lacks scientific foundation to make it an academic discipline. Science has been in search of invariants through various changes to identify the scientific truth to build theories on the invariants. A hierarchy of invariants is presented for computer graphics having cellular spatial structures as the core. Same application examples are shown for illustrative purposes. View full abstract»

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  • Creating a precise panorama from fanned video sequence images

    Publication Year: 1999, Page(s):6 - 11
    Cited by:  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Here we present an approach to offer a precise panoramic image composited from panned video sequence images, which are taken by a video camera on a tripod. The varying exposure levels due to the panned view fields taken by a camera with auto iris are adjusted. Any geometrical distortions in each frame, due to camera lens and/or CCD and perspective projection, are calibrated. The interlaced video s... View full abstract»

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  • Automatic camera placement for image-based modeling

    Publication Year: 1999, Page(s):12 - 20
    Cited by:  Papers (15)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (749 KB)

    We present an automatic camera placement method for generating image-based models from scenes with known geometry. Our method first approximately determines the set of surfaces visible from a given viewing area and then selects a small set of appropriate camera positions to sample the scene from. We define a quality measure for a surface as seen, or covered, from the given viewing area. Along with... View full abstract»

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  • Automatic creation of object hierarchies for radiosity clustering

    Publication Year: 1999, Page(s):21 - 29
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1592 KB)

    Using object clusters for hierarchical radiosity greatly improves the efficiency and thus usability of radiosity computations. By eliminating the quadratic starting phase very large scenes containing about 100 K polygons can be handled efficiently. Although the main algorithm extends rather easily to using object clusters, the creation of "good" object hierarchies is a difficult task both in terms... View full abstract»

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  • On-line motion retargetting

    Publication Year: 1999, Page(s):32 - 42
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (346 KB)

    This paper presents a method to retarget the motion of a character to another in real-time. The technique is based on inverse rate control, which compares the changes in joint angles corresponding to the changes in end-effector position. While tracking the multiple end-effector trajectories of the original subject or character, our on-line motion retargetting also minimizes the joint angle differe... View full abstract»

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  • A speech driven talking head system based on a single face image

    Publication Year: 1999, Page(s):43 - 49
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (4886 KB)

    In this paper, a lifelike talking head system is proposed. The talking head, which is driven by speaker independent speech recognition, requires only one single face image to synthesize lifelike facial expression. The proposed system uses speech recognition engines to get utterances and corresponding time stamps in the speech data. Associated facial expressions can be fetched from an expression po... View full abstract»

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  • Motion generator approach to translating human motion from video to animation

    Publication Year: 1999, Page(s):50 - 58
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (394 KB)

    This paper purpose a motion generator approach to translating human motion from video image sequences to computer animations in real-time. In the motion generator approach, a motion generator makes inferences on the current human motion and posture from the data obtained by processing the source video source, and then generates and sends a set of joint angles to the target human body model. Compar... View full abstract»

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  • Output sensitive extraction of silhouettes from polygonal geometry

    Publication Year: 1999, Page(s):60 - 69
    Cited by:  Papers (14)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    An algorithm to allow real time interactive extraction and orthographic display of silhouettes of complex two-manifold polygonal object(s) is presented. An off-line pre-processing of all the edges of all polygons enables the efficient extraction of the silhouette edges in real time, once a viewing direction is prescribed. During the interactive session, the time complexity of extracting the silhou... View full abstract»

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  • Exact computation of 4-D convex hulls with perturbation and acceleration

    Publication Year: 1999, Page(s):70 - 79
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (274 KB)

    An incremental algorithm for constructing the four-dimensional convex hull is implemented using exact arithmetic together with the symbolic perturbation technique. Exact judgement of the topological structure of the four-dimensional convex hull requires about four times higher precision than the input. To decrease this computational cost, the lazy evaluation scheme is used. Experiments show that t... View full abstract»

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  • Boundary determination for trivariate solids

    Publication Year: 1999, Page(s):82 - 91
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (283 KB)

    The trivariate tensor-product B-spline solid is a direct extension of the B-spline patch and has been shown to be useful in the creation and visualization of free-form geometric solids. Visualizing these solid objects requires the determination of the boundary surface of the solid, which is a combination of parametric and implicit surfaces. This paper presents a method that determines the implicit... View full abstract»

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  • A scan line algorithm for rendering curved tubular objects

    Publication Year: 1999, Page(s):92 - 101
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (170 KB)

    Parametric surfaces and implicit surfaces are generally used for representing curved surfaces in CAD/CG Systems. This paper discusses a curved tubular object which is a surface swept by a sphere/circle moving along a curve. For the trajectory curve, a 3D Bezier curve is employed, and its radius can be varied along the curve. In general, its surface cannot be defined by a closed form, while a high ... View full abstract»

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  • Opportunities for subdivision-based multiresolution modeling

    Publication Year: 1999, Page(s):104 - 105
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (31 KB)

    Applications in computer graphics, geometric modeling, and simulation based engineering design demand highly flexible and efficient algorithms for the manipulation of large scale, complex geometry. Examples include the acquisition, processing, and transmission of finely tessellated models of real world geometry. These geometries are typically represented as very large meshes ranging into hundreds ... View full abstract»

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  • Wavelet based 3D compression with fast random access for very large volume data

    Publication Year: 1999, Page(s):108 - 117
    Cited by:  Papers (32)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

    In this paper we propose a wavelet based method for compressing volumetric data with little loss in quality allowing fast random access to individual voxels within the volume. Such a method is important since storing and visualising very large volumes impose heavy demands on internal memory and external storage facilities, a problem not likely to become less in the future, making it accessible onl... View full abstract»

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  • An improved TIN compression using Delaunay triangulation

    Publication Year: 1999, Page(s):118 - 125
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (138 KB)

    In this paper we introduce a new compression technique for the connectivity of a Triangulated Irregular Network (TIN) by using Delaunay triangulation. The strategy in this paper is based on that most of 2.5 dimensional terrain connection are very similar to plane-projected Delaunay triangulation of their vertex set. We only need to keep the vertex coordinates and a few edges that are not included ... View full abstract»

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  • Visualization of optical phenomena caused by multilayer films with complex refractive indices

    Publication Year: 1999, Page(s):128 - 137
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (154 KB)

    This paper proposes a method for rendering objects coated with multilayer thin films. Multilayer thin films are widely utilized in industry for example, optical lenses, optical filters, and windowpanes, among others. Demand for visualization of the optical effects of multilayer films has therefore become great. To visualize optical properties of such films, we have developed a method for calculati... View full abstract»

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  • VISBONE: 3D visualization of bone mineral density

    Publication Year: 1999, Page(s):138 - 146
    Cited by:  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (298 KB)

    Volume visualization is an essential part of many computer-assisted medical applications. While general-purpose commercial visualization software can provide common functions for visualizing three-dimensional (3D) medical data, there are many occasions where specific requirements cannot be fulfilled by such software. In orthopaedic surgery involving screw insertion, surgeons must consider not only... View full abstract»

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  • An efficient wavelet-based compression method for volume rendering

    Publication Year: 1999, Page(s):147 - 156
    Cited by:  Papers (17)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (919 KB)

    Since volume rendering needs a lot of computation time and memory space, many researches have been suggested for accelerating rendering or reducing data size using compression techniques. However, there is little progress in a research for accomplishing these goals. This paper presents an efficient wavelet-based compression method providing fast visualization of large volume data, which is divided... View full abstract»

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  • Subdivision surface fitting to a range of points

    Publication Year: 1999, Page(s):158 - 167
    Cited by:  Papers (29)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The objective of this research is to apply the subdivision surface for surface fitting problems when generating surfaces from data points or polyhedral models. The basic idea is to use the subdivision limit position (SLP) to adapt the control mesh of the subdivision surface to the data points. This method is not a time consuming process involving global optimization. It does, however, fail to capt... View full abstract»

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  • Multiresolution constraints for designing subdivision surfaces via local smoothing

    Publication Year: 1999, Page(s):168 - 178
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (860 KB)

    Subdivision surfaces provide an efficient means of representing surfaces of arbitrary topological type. In recent years, multiresolution modeling with variational smoothing has played an important role in controlling such surfaces. This paper presents a new model of multiresolution constraints that can be applied to subdivision surfaces. The advantage of this model is that different geometric cons... View full abstract»

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  • Eigenanalysis and continuity of non-uniform Doo-Sabin surfaces

    Publication Year: 1999, Page(s):179 - 186
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (107 KB)

    In computer graphics and computer-aided geometric design, more and more subdivision schemes are being extensively used for free-form surfaces of arbitrary topology. The convergence and continuity analyses of uniform subdivision surfaces have been performed very well, but it is very difficult to prove the convergence and the continuity properties of non-uniform recursive subdivision surfaces (NURSS... View full abstract»

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  • Adaptive parameterization for reconstruction of 3D freeform objects from laser-scanned data

    Publication Year: 1999, Page(s):188 - 197
    Cited by:  Papers (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    This paper proposes a new adaptive parametrization method to overcome the problems of using laser scanners in Reverse Engineering. The method is based on the following stages: (a) Detecting a 3D boundary of the parametric base surface by matching an intensity image from a CCD camera with the scanned data. (b) Adaptively reconstructing a parametric base surface with a non-self intersecting grid, ba... View full abstract»

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  • Reconstruction and simplification of surfaces from contours

    Publication Year: 1999, Page(s):198 - 207
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (5304 KB)

    In this paper we consider the problem of reconstructing triangular surfaces from given contours. An algorithm solving this problem has to decide which contours of two successive slices should be connected by the surface (branching problem), and, given that, which vertices of the assigned contours should be connected for the triangular mesh (correspondence problem). We present a new approach that s... View full abstract»

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  • A multiscale deformable model for extracting complex surfaces from volume images

    Publication Year: 1999, Page(s):208 - 215
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (162 KB)

    Deformable surface models are an attractive method for segmenting the three-dimensional shapes of complex anatomic structures in volumetric medical images. Despite the success of this approach, several problems remain. In this paper, we propose a multiscale deformable surface model with non-intersection constraint forces that successfully addresses three significant problems-sensitivity to model i... View full abstract»

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  • Modeling and rendering methods of clouds

    Publication Year: 1999, Page(s):218 - 219
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    Recently, simulation of natural phenomena, such as water, smokes, fire, clouds, have been attempted in computer graphics. Clouds play an important role when generating images of outdoor scenes, the earth viewed from outer space and the visualization of weather information. This paper describes the modeling methods of clouds, and an efficient calculation method for light scattering due to clouds ta... View full abstract»

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