11th Pacific Conference onComputer Graphics and Applications, 2003. Proceedings.

8-10 Oct. 2003

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  • Proceedings 11th Pacific Conference on Computer Graphics and Applications

    Publication Year: 2003
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The following topics are dealt with: appearance and rendering; geometric modeling; 3D acquisition and interactive modeling; nonphotorealistic rendering; computer animation; morphing, shadow, and simulation; mesh; geometric computing and visibility; point-based rendering; and techniques for volume and mesh. View full abstract»

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  • Realistic rendering of surface appearance using GPU

    Publication Year: 2003
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (171 KB) | HTML iconHTML

    Summary form only given. We present techniques for realistic modeling surface details and efficient rendering of the associated visual effects using programmable GPUs. An important topic in rendering surface appearance is the treatment of mesostructures, which are responsible for fine-scale shadowing, occlusion, inter-reflectance, and silhouettes. One way to model surface mesostructure is by using... View full abstract»

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  • Computer graphics in its fifth decade: ferment at the foundations

    Publication Year: 2003, Page(s):4 - 21
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (476 KB) | HTML iconHTML

    Traditionally, computer graphics is based on the mathematics of projective geometry, homogeneous coordinates, and matrix algebra. Recently these mathematical foundations have been called into question by several authors. We examine some possible alternative mathematical underpinnings for computer graphics, including Grassman spaces and Grassman coordinates, tensors and tensor algebra, and Clifford... View full abstract»

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  • Machine learning for computer graphics: a manifesto and tutorial

    Publication Year: 2003, Page(s):22 - 36
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (334 KB) | HTML iconHTML

    It is argued that computer graphics can benefit from a deeper use of machine learning techniques. The author gives an overview of what learning has to offer the graphics community, with an emphasis on Bayesian techniques. He also attempts to address some misconceptions about learning, and to give a very brief tutorial on Bayesian reasoning. View full abstract»

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  • Freeform shape representations for efficient geometry processing

    Publication Year: 2003
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (170 KB) | HTML iconHTML

    Summary form only given. The most important concepts for the handling and storage of freeform shapes in geometry processing applications are parametric representations and volumetric representations. Both have their specific advantages and drawbacks. While the algebraic complexity of volumetric representations is independent from the shape complexity, the domain of a parametric representation usua... View full abstract»

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  • Data-driven computer graphics

    Publication Year: 2003
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (180 KB) | HTML iconHTML

    Summary form only given. The field of computer graphics abounds with modeling and simulation problems. Among these are the representation of surface shape, the description of surface reflectance, the probabilistic modeling of small-scale variations, and the application of physics for simulating the dynamics of rigid and elastic materials. During its formative years, computer graphics has focused l... View full abstract»

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  • Lightweight face relighting

    Publication Year: 2003, Page(s):41 - 50
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (523 KB) | HTML iconHTML

    We present a method to relight human faces in real time, using consumer-grade graphics cards even with limited 3D capabilities. We show how to render faces using a combination of a simple, hardware-accelerated parametric model simulating skin shading and a detail texture map, and provide robust procedures to estimate all the necessary parameters for a given face. Our model strikes a balance betwee... View full abstract»

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  • Efficient rendering of local subsurface scattering

    Publication Year: 2003, Page(s):51 - 58
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (581 KB) | HTML iconHTML

    A novel approach is presented to efficiently render local subsurface scattering effects. We introduce an important sampling scheme for a practical subsurface scattering model. It leads to a simple and efficient rendering algorithm, which operates in image-space, and which is even amenable for implementation on graphics hardware. We demonstrate the applicability of our technique to the problem of s... View full abstract»

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  • Interactive visualization of complex real-world light sources

    Publication Year: 2003, Page(s):59 - 66
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (511 KB) | HTML iconHTML

    Interactive visualization of complex, real-world light sources has so far not been feasible. We present a hardware accelerated direct lighting algorithm based on a recent high quality light source acquisition technique. By introducing an approximate reconstruction of the exact model, a multi-pass rendering approach, and a compact data representation, we are able to achieve interactive frame rates.... View full abstract»

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  • Variance invariant adaptive temporal supersampling for motion blurring

    Publication Year: 2003, Page(s):67 - 72
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (274 KB) | HTML iconHTML

    Adaptive temporal sampling, used to create motion blur in distributed ray tracing, generates more sample points in regions with motion blur than in regions without motion blur. When the number of sample points used on stationary objects in regions with motion blur exceeds the number of sample points used in other regions of the image, the variance in the color of the object can differ between the ... View full abstract»

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  • Illustration watermarks for vector graphics

    Publication Year: 2003, Page(s):73 - 82
    Cited by:  Papers (15)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (884 KB) | HTML iconHTML

    Digital watermarking is a technique for embedding information into data, such as images, 3D models, or audio files, such that some properties (i.e., security, imperceptibility, robustness) are maintained. While most of the existing watermarking techniques focus on encoding copyright information where security is one of the most important properties, we have developed algorithms for embedding Illus... View full abstract»

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  • Interactive modeling of tree bark

    Publication Year: 2003, Page(s):83 - 90
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (961 KB) | HTML iconHTML

    There exist many computer graphics techniques which could achieve high quality tree generation. However, only few works focus on realistic modeling of tree bark. Difficulties lie in the complex appearance of the bark surfaces from a single image. We address three main issues here: feature specification; height field assignment; and texture correction. For feature specification, we use texton chann... View full abstract»

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  • G/sup 2/ blending of corners with piecewise algebraic surfaces

    Publication Year: 2003, Page(s):93 - 101
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (327 KB) | HTML iconHTML

    In this paper, we present a construction approach to blend the corner of three coordinate planes with G/sup 2/ continuous piecewise algebraic surfaces. For each pair of two coordinate planes, an algebraic surface patch (which is defined in a tetrahedron or a prism) is used to blend the two coordinate planes, and then a center patch is constructed to blend the three algebraic surface patches. The d... View full abstract»

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  • Skinning Catmull-Clark subdivision surfaces with incompatible cross-sectional curves

    Publication Year: 2003, Page(s):102 - 111
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (5960 KB) | HTML iconHTML

    One of the major problems in the generation of skinning B-spline surfaces is the incompatibility of the cross-sectional curves. This occurs when the cross sections are defined by control polygons having different number of control devices. Traditionally, this incompatibility is overcome by knot insertion that makes all control polygons have equal number of vertices. The drawback of this solution i... View full abstract»

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  • Interactive 3D model acquisition and registration

    Publication Year: 2003, Page(s):115 - 122
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (330 KB) | HTML iconHTML

    The acquisition of geometric information from real-world objects has become a major way of modeling complex scenes and environments. Unfortunately, most optical methods for geometric model acquisition require the combination of partial information from different view points in order to obtain a single, coherent model. This, in turn, requires the registration of partial models into a common coordin... View full abstract»

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  • Dynamic sculpting and deformation of point set surfaces

    Publication Year: 2003, Page(s):123 - 130
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (335 KB) | HTML iconHTML

    This paper presents a novel paradigm for point set surface editing, which takes advantages of the potential of implicit surfaces, the strength of physics based modeling techniques, and the simplicity of point sampled surfaces. Our point set surface is evaluated as the zero set of the weighted sum of the collection of the scalar trivariate B-spline functions defined over the local domain of each po... View full abstract»

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  • Interactive global and local deformations for virtual clay

    Publication Year: 2003, Page(s):131 - 140
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (459 KB) | HTML iconHTML

    Making virtual modeling as easy and intuitive as real-clay manipulation is still an unsolved problem. This paper takes a step in this direction: in addition to offering standard features such as addition and removal of material, it uses a new real-time plasticity model to let the user apply local and global deformations such as those made in real clay by pressing with a finger or bending a sculptu... View full abstract»

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  • A painting interface for interactive surface deformations

    Publication Year: 2003, Page(s):141 - 150
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1019 KB) | HTML iconHTML

    A long-standing challenge in geometric modeling is providing a natural, intuitive interface for making local deformations to 3D surfaces. Previous approaches have provided either interactive manipulation or physical simulation to control surface deformations. In this paper, we investigate combining these two approaches with a painting interface that gives the user direct, local control over a phys... View full abstract»

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  • Non-photorealistic rendering and content-based image retrieval

    Publication Year: 2003, Page(s):153 - 162
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (757 KB) | HTML iconHTML

    In this paper, we will show how non-photorealistic rendering (NPR) can take a new role in content-based image retrieval (CBIR). The proposed CBIR method applies a novel image similarity measure: unlike traditional features like color, texture, or shape, our measure is based on a painted representation of the original image. This is produced by a stochastic paintbrush algorithm which simulates a pa... View full abstract»

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  • Simulating wax crayons

    Publication Year: 2003, Page(s):163 - 172
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (596 KB) | HTML iconHTML

    We present a physically-inspired model of wax crayons, which synthesizes drawings from collections of user-specified strokes. Paper is represented by a height-field texture, and a crayon is modeled with a 2D mask that evolves as it interacts with the paper. The amount of wax deposition is computed based on the crayon contact profile, contact force, and friction. Previously deposited wax is smeared... View full abstract»

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  • Computer-assisted auto coloring by region matching

    Publication Year: 2003, Page(s):175 - 184
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (513 KB) | HTML iconHTML

    Computer-assisted auto coloring (CAAC) has great potential in terms of lowering production cost and saving time in cel animation production. In this paper, a novel approach to automatically color the animation character of line drawings based on region matching and master frames is proposed. Firstly, some important attributes of a region such as curve length, character points, area etc. are invest... View full abstract»

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  • Enhancing silhouette-based human motion capture with 3D motion fields

    Publication Year: 2003, Page(s):185 - 193
    Cited by:  Papers (14)  |  Patents (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (636 KB) | HTML iconHTML

    High-quality nonintrusive human motion capture is necessary for acquisition of model-based free-viewpoint video of human actors. Silhouette-based approaches have demonstrated that they are able to accurately recover a large range of human motion from multiview video. However, they fail to make use of all available information, specifically that of texture information. This paper presents an algori... View full abstract»

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  • Physical touch-up of human motions

    Publication Year: 2003, Page(s):194 - 203
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (5230 KB) | HTML iconHTML

    Many popular motion editing methods do not take physical principles into account potentially producing implausible motions. This paper introduces an efficient method for touching up edited motions to improve physical plausibility. We start by estimating a mass distribution consistent with reference motions known to be physically correct. The edited motion is then divided into ground and flight sta... View full abstract»

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  • Modeling and deformation of arms and legs based on ellipsoidal sweeping

    Publication Year: 2003, Page(s):204 - 212
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1233 KB) | HTML iconHTML

    We present a new approach to the modeling and deformation of a human or virtual character's arm and legs. Each limb is represented as a set of ellipsoids of varying size interpolated along a skeleton curve. A base surface is generated by approximating these ellipsoids with a swept ellipse, and the difference between that and the detailed shape of the arm or leg is represented as a displacement map... View full abstract»

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  • Feature-based surface light field morphing

    Publication Year: 2003, Page(s):215 - 223
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (2345 KB) | HTML iconHTML

    A surface light field is a function that gives the colors of each object point viewed from different directions. Object representation with a surface light field provides a nice structure for 3D photography. This paper presents a feature-based morphing technique for two objects equipped with surface light fields. The technique consists of geometry morphing and in-between light field mapping. Geome... View full abstract»

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