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pacific conference on computer graphics and applications

作者： X. Granier W. Heidrich Department of Computer Science IMAGER University of British Columbia Vancouver BC Canada

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 effects, with a simple RGB BRDF model. We present a model for both specular and diffuse reflection.

关键词： Optical reflection Interference Computational modeling Solid modeling Lighting computer graphics Surface waves computer science Bidirectional control Reflectivity

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Parallel and Distributed Computing: applications and Technologies 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Kim-Meow Liew Hong Shen Simon See Wentong Cai Pingzhi Fan Susumu Horiguchi

ISBN: (数字)9783540305019

ISBN: (纸本)9783540240136

The 2004 International conference on Parallel and Distributed Computing, - plications and Technologies (PDCAT 2004) was the ?fth annual conference, and was held at the Marina Mandarin Hotel, Singapore on December 8–10, 2004. Since the inaugural PDCAT held in Hong Kong in 2000, the conference has - come a major forum for scientists, engineers, and practitioners throughout the world to present the latest research, results, ideas, developments, techniques, and applications in all areas of parallel and distributed computing. The technical program was comprehensive and featured keynote speeches, te- nical paper presentations, and exhibitions showcased by industry vendors. The technical program committee was overwhelmed with submissions of papers for presentation, from countries worldwide. We received 242 papers and after - viewing them, based on stringent selection criteria, we accepted 173 papers. The papers in the proceedings focus on parallel and distributed computing viewed from the three perspectives of networking and architectures, software systems and technologies, and algorithms and applications. We acknowledge the great contribution from all of our local and international committee members and - perreviewerswhodevotedtheirtimeinthereviewprocessandprovidedvaluable feedback for the authors. PDCAT 2004 could never have been successful without the support and ass- tance of several institutions and many people. We sincerely appreciate the s- port from the National Grid O?ce and IEEE, Singapore for technical ***?nancialsponsorshipsfromtheindustrialsponsors,Hewlett- Packard Singapore; IBM Singapore; Sun Microsystems; SANDZ Solutions; S- icon graphics, and Advanced Digital Information Corporation, are gratefully acknowledged.

关键词： computer Communication Networks Theory of Computation Software Engineering/Programming and Operating Systems computer Systems Organization and Communication Networks Information Systems and Communication Service computer Imaging, Vision, Pattern Recognition and graphics

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Low cost immersive displays: the cubicle of the future

Low cost immersive displays: the cubicle of the future

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pacific conference on computer graphics and applications

作者： M. Green Department of Computing Science University of Alberta Edmonton AB Canada

A number of immersive display technologies have been developed over the past decade. While many of these display technologies have proved to be effective, they are still far too expensive for common use. This paper presents a low cost immersive display device called Vision Space. This device can be viewed as a personal immersive workspace that takes the form of an office cubicle.

关键词： Costs Space technology computer displays Three dimensional displays Space exploration Application software Consumer products Production Image generation Hardware

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Bounded clustering-finding good bounds on clustered light transport

Bounded clustering-finding good bounds on clustered light tr...

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pacific conference on computer graphics and applications

作者： M. Stamminger P. Slusallek H.P. Seidel Computer Graphics Group University of Erlangen Germany

Clustering is a very efficient technique to apply finite element methods to the computation of radiosity solutions of complex scenes. Both computation time and memory consumption can be reduced dramatically by grouping the primitives of the input scene into a hierarchy of clusters and allowing for light exchange between all levels of this hierarchy. However, problems can arise due to clustering, when gross approximations about a cluster's content result in unsatisfactory solutions or unnecessary computations. In the clustering approach for diffuse global information described in the paper, light exchange between two objects-patches or clusters-is bounded by using geometrical and shading information provided by every object through a uniform interface. With this uniform view of various kinds of objects, comparable and reliable error bounds on the light exchange can be computed, which then guide a standard hierarchical radiosity algorithm.

关键词： Clustering algorithms Layout computer graphics Lighting computer errors Computational modeling Design methodology Light scattering

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Cross-Parameterization for Triangular Meshes with Semantic Features

Cross-Parameterization for Triangular Meshes with Semantic F...

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pacific conference on computer graphics and applications

作者： Shun Matsui Kota Aoki Hiroshi Nagahashi Ken'ichi Morooka Tokyo Institute of Technology Japan Kyushu University Japan

ISBN: (纸本)9780769530093;0769530095

In 3D computer graphics, mesh parameterization is a key technique for digital geometry processings(DGP) such as morphing, shape blending, texture transfer, re-meshing and so on. This paper proposes a novel approach for parameterizing a mesh into another one directly. The main idea of our method is to combine a competitive learning and a leastsquare mesh techniques. It is enough to give some semantic feature correspondences between target meshes, even if they are in different shapes or in different poses. We show the effectiveness of our approach by giving some examples of its applications.

关键词： Mesh generation Shape computer graphics Application software Computational geometry Robustness Surface reconstruction Equations

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Knitting a 3D Model

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computer graphics FORUM 2008年第7期27卷 1737-1743页

作者： Igarashi, Yuki Igarashi, Takeo Suzuki, Hiromasa Univ Tokyo Tokyo 1138654 Japan

A knitted animal is made of a closed surface consisting of several knitted patches knitted out of yarn and stuffed with cotton ( Fig. 1). We introduce a system to create a knitting pattern from a given 3D surface model ( mainly designed for rotund animal models). A knitting pattern is an instructional diagram describing how to knit yarn to obtain a desired shape. Since the creation of knitting patterns requires special skill, this is difficult for nonprofessionals. Our system automates the process and allows anyone to obtain his or her original knitting patterns from a 3D model. The system first covers the surface of the model with parallel winding strips of constant width. The system then samples the strip at constant intervals to convert it into a knitting pattern. The result is presented in a standard visual format so that the user can easily refer it during actual knitting. We show several examples of knitted animals created using the system.

关键词： I.3.6 [computer graphics]: Methodology and Tech-niquesInteraction Techniques I.3.5 [computer graphics]: Computational Geometry and Object Modeling Geometric Algorithms

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Live participant's action recognition for virtual reality interactions

Live participant's action recognition for virtual reality in...

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pacific conference on computer graphics and applications

作者： L. Emering R. Boulic D. Thalmann LIG-Computer Graphics Laboratory Swiss Federal Institute of Technology Lausanne Switzerland

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 high detection rates when using the full potential of the action model. An example illustrates an interaction with a virtual character driven by the participant's action recognition.

关键词： Virtual reality Humans Biological system modeling Character recognition Robustness Magnetic sensors computer graphics Particle measurements Surges Handicapped aids

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Real-Time Approximate Subsurface Scattering on graphics Hardware

Real-Time Approximate Subsurface Scattering on Graphics Hard...

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pacific conference on computer graphics and applications

作者： Hyunwoo Ki Jihye Lyu Kyoungsu Oh Soongsil University South Korea SK C and C

ISBN: (纸本)9780769530093;0769530095

This paper presents an image-space approximation technique for real-time subsurface scattering. We first create transmitted irradiance samples on shadow maps and then estimate single scattering efficiently using a method similar to shadow mapping, with adaptive deterministic sampling. We incorporate this single-scattering with a recently proposed technique for multiple scattering. We demonstrate that our technique produces high-quality images of animated scenes. We archived hundreds of frames per second on graphics hardware without lengthy preprocessing.

关键词： Hardware Light scattering Optical scattering Particle scattering computer graphics Shadow mapping Animation Application software Image sampling Layout

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Automatic feature extraction and face synthesis in facial image coding

Automatic feature extraction and face synthesis in facial im...

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pacific conference on computer graphics and applications

作者： Fu-Che Wu Tzong-Jer Yang Ming Ouhyoung Communication & Multimedia Laboratory Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)0818686200

A real-time method that automatically extracts facial feature points is proposed. Based upon this technique, the authors also present a procedure to encode facial images efficiently. For clarity the proposed method is divided into an analysis part and synthesis part. The analysis part includes face tracking, feature extraction, and pose estimation. All of these procedures are applicable for live video applications. In the synthesis part, a new face image is synthesized using one base image and a small number of feature images. The current performance of feature extraction is about 8 frames per second on a Pentinum II 233 MHz PC with an image size 320/spl times/240.

关键词： Feature extraction Image coding Head Hair Face Humans Eyes Nose Iterative methods Multimedia communication

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Fast and Faithful Geometric Algorithm for Detecting Crest Lines on Meshes

Fast and Faithful Geometric Algorithm for Detecting Crest Li...

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pacific conference on computer graphics and applications

作者： Shin Yoshizawa Alexander Belyaev Hideo Yokota Hans-Peter Seidel RIKEN Japan MPI Informatik Germany

A new geometry-based finite difference method for a fast and reliable detection of perceptually salient curvature extrema on surfaces approximated by dense triangle meshes is proposed. The foundations of the method are two simple curvature and curvature derivative formulas overlooked in modern differential geometry textbooks and seemingly new observation about inversion-invariant local surface-based differential forms.

关键词： Surface fitting Geometry Curve fitting computer graphics Application software Finite difference methods Physiology Shape Polynomials Noise robustness

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