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An improved TIN compression using Delaunay triangulation

An improved TIN compression using Delaunay triangulation

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pacific conference on computer graphics and applications

作者： Yang-Soo Kim Dong-Gyu Park Ho-Youl Jung Hwan-Gue Cho Jang-Jun Dong Keum-Jung Ku Department of Computer Science Pusan National University busan South Korea busan South Korea

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 in the Delaunay edges. We present an efficient encoding method for the set of edges using vertex reordering and general bracketing algorithm. Also we propose progressive visualization method for web-based GIS. In the experiments, the method was examined on several TIN data with various resolutions, which were generated by five typical terrain simplification algorithms. The connectivity information of common terrain data could be compressed by 0.23 bits per vertex.

关键词： Tin Geographic Information Systems Geometry computer science Electronic mail Data visualization Rain Compression algorithms Encoding Strips

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

A speech driven talking head system based on a single face i...

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pacific conference on computer graphics and applications

作者： I-Chen Lin Cheng-Sheng Hung Tzong-Jer Yang Ming Ouhyoung Communication and Multimedia Laboratory Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

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 pool and the synthetic facial expression can then be synchronized with speech. When applied to Internet, our web-enabled talking head system can be a vivid merchandise narrator, and only requires 50 K bytes/minute with an additional face image (about 40 Kbytes in CIF format, 24 bit-color, JPEG compression). The system can synthesize facial animation more than 30 frames/sec on a Pentium II 266 MHz PC.

关键词： Head Facial animation Speech recognition Speech synthesis Internet Multimedia communication Multimedia systems Laboratories computer science Search engines

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Physical touch-up of human motions

Physical touch-up of human motions

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pacific conference on computer graphics and applications

作者： Hyun Joon Shin L. Kovar M. Gleicher University of Wisconsin University of Wisconsin USA

ISBN: (纸本)0769520286

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 stages and adjusted to enforce appropriate physical laws, for, respectively, zero moment point (ZMP) constraints and correct ballistic trajectory. Unlike previous methods, we do not solve a nonlinear optimization to calculate the adjustment. Instead, closed-form methods are used to construct a hierarchical displacement map which sequentially refines user-specified degrees of freedom at different scales. This is combined with standard methods for kinematic constraint enforcement, yielding an efficient and scalable editing method that allows users to model real human behaviors. The potential of our approach is demonstrated in a number of examples.

关键词： Humans computer graphics Application software

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Realistic rendering of surface appearance using GPU

Realistic rendering of surface appearance using GPU

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pacific conference on computer graphics and applications

作者： Baining Guo Microsoft Research China Microsoft (China) Company Limited Beijing China

ISBN: (纸本)0769520286

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 the bi-directional texture function (BTF), a 6D function that describes the appearance of a real-world surface as a function of lighting and viewing directions. We describe algorithms for efficient synthesis of BTFs on arbitrary surfaces and for hardware-accelerated rendering. Because the BTF can be measured from real-world surfaces, these algorithms allow us to texture 3D models with real-world textures. One issue with the BTF-based approach is that silhouettes of surface mesostructures are absent in the rendered images. This problem can be addressed by view-dependent displacement mapping, a technique for real-time rendering of displacement mapped surfaces using GPUs. We will present examples of our techniques shipped with major game platforms and some upcoming game titles.

关键词： Surface treatment Surface texture Rendering (computer graphics) Visual effects Shadow mapping Bidirectional control computer graphics Application software

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A physics-based framework for subdivision surface design with automatic rules control

A physics-based framework for subdivision surface design wit...

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pacific conference on computer graphics and applications

作者： Hui Xie Hong Qin Department of Computer Science State University of New York Stony Brook Stony Brook NY USA

ISBN: (纸本)0769517846

The recent non-uniform subdivision approach extends traditional uniform subdivision schemes with variable rules, offering additional shape parameters (such as knot spacings) for feature control. Despite its flexibility, shape modification based on non-uniform subdivision usually requires designers to interactively adjust a large number of degrees of freedom (DOFs) to achieve the desired shapes, which can often be laborious. This paper extends the principle of variational subdivision and integrates the non-uniform subdivision schemes with powerful physics-based shape sculpting techniques, providing a universal method for arbitrary subdivision schemes with adjustable rules. The subdivision control points and knot spacings evolve in response to the shape deformation resulting from the numerical integration of Lagrangian dynamics equation or the optimization of shape energy functional. Thus, our system allows users to manipulate the desired shape in a direct and intuitive fashion. In addition, we propose a novel and efficient discrete functional evaluation method for polygonal meshes or point clouds of arbitrary topology based on implicit functions, in which no parameterization is needed. Finally, we develop a simple prototype sculpting system demonstrating many advantages of our novel physics-based, non-uniform subdivision modeling system.

关键词： Automatic control Shape control Aerodynamics Topology Animation computer science Equations Clouds computer graphics Design automation

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Feature-based surface light field morphing

Feature-based surface light field morphing

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pacific conference on computer graphics and applications

作者： Eunhee Jeong Mincheol Yoon Yunjin Lee Minsu Ahn Seungyong Lee Baining Guo Department of Computer Science and Engineering Pohang University of Science and Technology Pohang South Korea Microsoft Research Asia Beijing China

ISBN: (纸本)0769520286

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. Geometry morphing is accomplished by 3D mesh morphing, where we introduce a vertex merging technique to generate a simpler metamesh. In in-between light field mapping, an in-between object is rendered by extracting necessary fragments from input surface light fields. We also propose an acceleration technique for rendering an in-between object. Experimental results with real and synthetic data show natural and plausible morphing between objects with surface light fields. The proposed morphing technique can be used as an editing tool for 3D photography.

关键词： Geometry Photography Acceleration Rendering (computer graphics) Surface texture Merging Mesh generation Data mining Visual effects computer science

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Multifunction workstation integrated voice/data/graphics for the ISDN environment

Multifunction workstation integrated voice/data/graphics for...

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IEEE pacific Rim conference on Communications, computers and Signal Processing

作者： Chewei Huang Guangguo Bi Qixiu Chen Li Li South-East University Nanjing China Nanjing Aeronautical Institute Nanjing China University of Ottawa Ottawa Canada

The authors focus on the development of a multifunction workstation for the ISDN environment, integrating voice, data, and graphics information. The configuration and services of the workstation are introduced. The multimedia protocol and multimedia synchronization are discussed, and the implementation of the ISDN communication control unit (CCU) board and the CCU interface to the host computer are described. In addition, a brief discussion is included on how to counteract weakness of the multitasking operation system in read-time support. The architecture and implementation of the basic system software and the relationship between parallel processes are described. Some applications of multifunction workstations are introduced.< >

关键词： Workstations ISDN computer graphics Protocols Communication system control computer interfaces Multitasking computer architecture System software Application software

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Roadmap-based flocking for complex environments

Roadmap-based flocking for complex environments

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pacific conference on computer graphics and applications

作者： O. Burchan Bayazit Jyh-Ming Lien N.M. Amato Texas A and M University USA

ISBN: (纸本)0769517846

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 assumed to have global information about the environment, only very simple navigation and planning techniques have been considered for such flocks. In this paper, we investigate how the addition of global information in the form of a roadmap of the environment enables more sophisticated flocking behaviors. In particular, we study and propose new techniques for three distinct group behaviors: homing, exploring and shepherding. These behaviors exploit global knowledge of the environment and utilize knowledge gathered by all flock members. This knowledge is communicated by allowing individual flock members to dynamically update the shared roadmap to reflect (un)desirable routes or regions. We present experimental results showing how the judicious use of simple roadmaps of the environment enables more complex behaviors to be obtained at minimal cost.

关键词： Navigation Path planning Computational modeling computer simulation Animation Application software Birds Marine animals Costs Educational institutions

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Application of computer graphics Technology

Application of Computer Graphics Technology

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2011 2nd Asia-pacific conference on Wearable Computing Systems (APWCS 2011);2011 International conference on Intelligent Control and Information Technology (ICICIT 2011)

作者： Wang Wei Institute of Art and Fashion Tianjin polytechnic university

computer graphics technology is very active in recent years, technology research, design applications in the more extensive and successful. With the development of computers and peripheral equipment,

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A panoramic-based walkthrough system using real photos

A panoramic-based walkthrough system using real photos

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pacific conference on computer graphics and applications

作者： Yan-Fai Chan Man-Hong Fok Chi-Wing Fu Pheng-Ann Heng Tien-Tsin Wong Chinese University of Hong Kong Hong Kong China

Recent advances in image-based rendering techniques allow us to have interactive panoramic viewing of real world environment using real photos. With panorama visualization tools like QuickTime VR or Realspace Viewer, we are able to have fast navigation in an image-based environment. However, the navigation control is restricted to panning, zooming and tilting of a single panoramic view. Smooth walkthrough between panoramic nodes is not yet supported. In this paper, we first describe how we apply the epipolar geometry between cylindrical projection manifolds to find point correspondences between real-world panoramic photos. A correspondence matching program is developed to allow users to identify correspondence interactively. The correspondence information is identified by defining patches on the panoramic image. Then, the system can generate a triangular mesh for the panorama based on the given patches. After that, we are able to provide free navigation between panoramic nodes by means of the triangle-based image warping technique.

关键词： Navigation Geometry Virtual reality Rendering (computer graphics) Identity-based encryption Independent component analysis Visualization Layout Wrapping Mesh generation

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