10th Pacific Conference on Computer Graphics and Applications, 2002. Proceedings.

9-11 Oct. 2002

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  • Proceedings 10th Pacific Conference on Computer Graphics and Applications

    Publication Year: 2002
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    Freely Available from IEEE
  • The i-Cone/spl trade/ - a panoramic display system for virtual environments

    Publication Year: 2002, Page(s):3 - 7
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1397 KB) | HTML iconHTML

    We present the i-Cone/spl trade/ : a new projection-based panoramic display system for virtual environments. The i-Cone/spl trade/ uses conical screen geometry, resulting in optimized projector placement to create an extended workspace for standing participants in afront projection curved screen display with a very large continuous field of view. Improved acoustical properties of the conical scree... View full abstract»

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  • Approximation with active B-spline curves and surfaces

    Publication Year: 2002, Page(s):8 - 25
    Cited by:  Papers (27)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (927 KB) | HTML iconHTML

    An active contour model for parametric curve and surface approximation is presented. The active curve or surface adapts to the model shape to be approximated in an optimization algorithm. The quasi-Newton optimization procedure in each iteration step minimizes a quadratic function which is built up with the help of local quadratic approximants of the squared distance function of the model shape an... View full abstract»

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  • A simple layered RGB BRDF model

    Publication Year: 2002, Page(s):30 - 37
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (464 KB) | HTML iconHTML

    Many natural objects, and general layered materials, have non-linear reflection behaviour along wavelengths. An accurate representation of phenomena such as interference and colour separation generally requires a fine spectral representation of light instead of the commonly used RGB components. In this article, we introduce and experiment with a general approach to create similar and convincing ef... View full abstract»

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  • Estimation of multiple directional light sources for synthesis of mixed reality images

    Publication Year: 2002, Page(s):38 - 47
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1711 KB) | HTML iconHTML

    We present a new method for the detection and estimation of multiple directional illuminants, using a single image of any object with known geometry and Lambertian reflectance. We use the resulting highly accurate estimates to modify virtually the illumination and geometry of a real scene and produce correctly illuminated mixed reality images. Our method obviates the need to modify the imaged scen... View full abstract»

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  • Analytic light transport approximations for volumetric materials

    Publication Year: 2002, Page(s):48 - 57
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (471 KB) | HTML iconHTML

    Subsurface scattering and light transport in volumetric media are critical to achieve a realistic depiction of a material. We describe several analytical approximations and methods for volumetric light transport in media of various optical properties that are efficient and easy to compute. Most natural materials exhibit a sudden surge in brightness called the opposition effect around the zero phas... View full abstract»

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  • Lighting interpolation by shadow morphing using intrinsic lumigraphs

    Publication Year: 2002, Page(s):58 - 65
    Cited by:  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (3006 KB) | HTML iconHTML

    Densely-sampled image representations such as the light field or lumigraph have been effective in enabling photorealistic image synthesis. Unfortunately, lighting interpolation with such representations has not been shown to be possible without the use of accurate 3D geometry and surface reflectance properties. In this paper we propose an approach to image-based lighting interpolation that is base... View full abstract»

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  • Facial expression space learning

    Publication Year: 2002, Page(s):68 - 76
    Cited by:  Papers (39)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (435 KB) | HTML iconHTML

    Animation of facial speech and expressions has experienced increased attention recently. Most current research focuses on techniques for capturing, synthesizing, and retargeting facial expressions. Little attention has been paid to the problem of controlling and modifying the expression itself. We present techniques that separate video data into expressive features and underlying content. This all... View full abstract»

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  • "May I talk to you? : -) " - facial animation from text

    Publication Year: 2002, Page(s):77 - 86
    Cited by:  Papers (10)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (7759 KB) | HTML iconHTML

    We introduce a facial animation system that produces real-time animation sequences including speech synchronization and non-verbal speech-related facial expressions from plain text input. A state-of-the-art text-to-speech synthesis component performs linguistic analysis of the text input and creates a speech signal from phonetic and intonation information. The phonetic transcription is additionall... View full abstract»

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  • Learning Kernel-based HMMs for dynamic sequence synthesis

    Publication Year: 2002, Page(s):87 - 95
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (853 KB) | HTML iconHTML

    In this paper we present an approach that synthesizes a dynamic sequence from another related sequence, and apply it to a virtual conductor: to synthesize linked figure animation from an input music track. We propose that the mapping between two dynamic sequences can be modeled with a Kernel-based Hidden Markov model, or KHMM. A KHMM is an HMM for which the kernel-based functions are used to model... View full abstract»

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  • Combining 2D feature tracking and volume reconstruction for online video-based human motion capture

    Publication Year: 2002, Page(s):96 - 103
    Cited by:  Papers (9)  |  Patents (19)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (557 KB) | HTML iconHTML

    The acquisition of human motion data is of major importance for creating interactive virtual environments, intelligent user interfaces, and realistic computer animations. Today's performance of off-the-shelf computer hardware enables marker-free non-intrusive optical tracking of the human body. In addition, recent research shows that it is possible to efficiently acquire and render volumetric scen... View full abstract»

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  • Roadmap-based flocking for complex environments

    Publication Year: 2002, Page(s):104 - 113
    Cited by:  Papers (16)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (531 KB) | HTML iconHTML

    Flocking behavior is very common in nature, and there have been ongoing research efforts to simulate such behavior in computer animations and robotics applications. Generally, such work considers behaviors that can be determined independently by each flock member solely by observing its local environment, e.g., the speed and direction of its neighboring flock members. Since flock members are not a... View full abstract»

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  • The light field oracle

    Publication Year: 2002, Page(s):116 - 126
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1713 KB) | HTML iconHTML

    We present the light field oracle, a novel mathematical concept for the acquisition, processing and representation of light fields. We first compute a hierarchical representation from a set of sparse image samples using a combination of wavelet transform and scattered data interpolation. The light field oracle then progressively acquires image data and selectively refines this initial representati... View full abstract»

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  • Robust acquisition of 3D informations from short image sequences

    Publication Year: 2002, Page(s):127 - 136
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (865 KB) | HTML iconHTML

    This paper addresses the problem of 3D reconstruction from a set of viewpoints on a short baseline. Its main contribution is the development of a robust algorithm which can extract 3D informations from a set of images taken with a very small baseline, even in the presence of significant occlusion. To achieve this goal, we use a multi-pass process that works layer by layer. In each pass we begin wi... View full abstract»

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  • Scam light field rendering

    Publication Year: 2002, Page(s):137 - 144
    Cited by:  Papers (10)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (582 KB) | HTML iconHTML

    In this paper we present a new variant of the light field representation that supports improved image reconstruction by accommodating sparse correspondence information. This places our representation somewhere between a pure, two-plane parameterized, light field and a lumigraph representation, with its continuous geometric proxy. Our approach factorises the rays of a light field into one of two se... View full abstract»

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  • Blending multiple views

    Publication Year: 2002, Page(s):145 - 153
    Cited by:  Papers (3)  |  Patents (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (752 KB) | HTML iconHTML

    Current blending methods in image-based rendering use local information such as "deviations from the closest views" to find blending weights. They include approaches such as the view-dependent texture mapping and blending fields used in unstructured lumigraph rendering. However, in the presence of depth discontinuities, these techniques do not provide smooth transitions in the target image if the ... View full abstract»

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  • Geometric deformation-displacement maps

    Publication Year: 2002, Page(s):156 - 165
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1474 KB) | HTML iconHTML

    Texture mapping, bump mapping, and displacement maps are central instruments in computer graphics aiming to achieve photo-realistic renderings. In all these techniques, the mapping is typically one-to-one and a single surface location is assigned a single texture color, normal, or displacement. Other specialized techniques have also been developed for the rendering of supplementary surface details... View full abstract»

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  • A simple method for modeling wrinkles on human skin

    Publication Year: 2002, Page(s):166 - 175
    Cited by:  Papers (34)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1614 KB) | HTML iconHTML

    Realism of rendered human skin can be strongly enhanced by taking into account skin wrinkles. However, modeling wrinkles is a difficult task, and considerable time and effort are necessary to achieve satisfactory results. This paper presents a simple method to easily model wrinkles on human skin, taking into account the properties of real wrinkles. Wrinkles are specified using intuitive parameters... View full abstract»

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  • Painting folds using expansion textures

    Publication Year: 2002, Page(s):176 - 183
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1174 KB) | HTML iconHTML

    We present a method relying on expansion textures to add details such as folds on a surface. The user paints the expansion attributes on the surface (amount and direction of expansion, wavelength and regularity of folds), using either interactive or procedural tools. The modeling system generates the folds by calculating the new surface equilibrium. Results show that this tool allows computer grap... View full abstract»

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  • Pattern-based texture metamorphosis

    Publication Year: 2002, Page(s):184 - 191
    Cited by:  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1234 KB) | HTML iconHTML

    In this paper we study texture metamorphosis, or how to generate texture samples that smoothly transform from a source texture image to a target. We propose a pattern-based approach to specify the feature correspondence between two textures, based on the observation that man), texture images have stochastically distributed patterns which are similar to each other First, the user selects a pattern ... View full abstract»

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  • A practical and flexible tiled display system

    Publication Year: 2002, Page(s):194 - 203
    Cited by:  Papers (14)  |  Patents (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (899 KB) | HTML iconHTML

    Computer graphics and high-resolution digital imagery are becoming increasingly pervasive in communities not traditionally associated with graphics. Commodity graphics cards and digital cameras, along with powerful modeling software, allow organizations such as libraries, museums, and small businesses to produce expressive and realistic computer generated imagery, far surpassing the capabilities o... View full abstract»

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  • Fast and memory efficient view-dependent trimmed NURBS rendering

    Publication Year: 2002, Page(s):204 - 213
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (739 KB) | HTML iconHTML

    The problem of rendering large trimmed NURBS models at interactive frame rates is of great interest for industry, since nearly all their models are designed on the basis of this surface type. Most existing approaches first transform the NURBS surfaces into polygonal representation and subsequently build static levels of detail upon them, as current graphics hardware is optimized for rendering tria... View full abstract»

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  • Interactive rendering of translucent objects

    Publication Year: 2002, Page(s):214 - 224
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (806 KB) | HTML iconHTML

    This paper presents a rendering method for translucent objects, in which view point and illumination can be modified at interactive rates. In a preprocessing step the impulse response to incoming light impinging at each surface point is computed and stored in two different ways: The local effect on close-by surface points is modeled as a per-texel filter kernel that is applied to a texture map rep... View full abstract»

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  • Real-time consensus-based scene reconstruction using commodity graphics hardware

    Publication Year: 2002, Page(s):225 - 234
    Cited by:  Papers (33)  |  Patents (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (904 KB) | HTML iconHTML

    We present a novel use of commodity graphics hardware that effectively combines a plane-sweeping algorithm with view synthesis for real-time, on-line 3D scene acquisition and view synthesis. Using real-time imagery from a few calibrated cameras, our method can generate new images from nearby viewpoints, estimate a dense depth map from the current viewpoint, or create a textured triangular mesh. We... View full abstract»

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  • Computing distances between surfaces using line geometry

    Publication Year: 2002, Page(s):236 - 245
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (754 KB) | HTML iconHTML

    We present an algorithm for computing the distance between two free-form surfaces. Using line geometry, the distance computation is reformulated as a simple instance of a surface-surface intersection problem, which leads to low-dimensional root finding in a system of equations. This approach produces an efficient algorithm for computing the distance between two ellipsoids, where the problem is red... View full abstract»

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