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Curvature detail representation of triangular surfaces

Journal of Zhejiang University-science A(Applied Physics & Engineering) 2006年第7期7卷 1210-1214页

作者： WU Jin-zhong LIU Xue-hui WU En-hua State Key Lab of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China Department of Computer and Information Science University of Macao Macao China Graduate University of Chinese Academy of Sciences Beijing 100039 China

Curvature tells much about details of surfaces and is studied widely by researchers in the computer graphics com- munity. In this paper, we first explain the mean-curvature view of Dirichlet energy of triangular surfaces and introduce a curvature representation of details, and then present surfaces editing applications based on their curvature representation. We apply our method to surfaces with complex boundaries and rich details. Results show the validity and robustness of our method and dem- onstrate curvature map can be a helpful surfaces detail representation.

关键词： Curvature Detail representation Mesh editing Shape editing Dirichlet energy

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As-consistent-as-possible compositing of virtual objects and video sequences

As-consistent-as-possible compositing of virtual objects and...

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作者： Zhang, Guofeng Qin, Xueying An, Xiaobo Chen, Wei Bao, Hujun State Key Lab. of CAD and CG Zhejiang University China State Key Lab. of CAD and CG College of Computer Science Zhejiang University Zhejiang University Department of Computer Science Zhejiang Univ. State Key Lab. of CAD and CG Zhejiang University

We present an efficient approach that merges the virtual objects into video sequences taken by a freely moving camera in a realistic manner. The composition is visually and geometrically consistent through three main steps. First, a robust camera tracking algorithm based on key frames is proposed, which precisely recovers the focal length with a novel multi-frame strategy. Next, the concerned 3D models of the real scenes are reconstructed by means of an extended multi-baseline algorithm. Finally, the virtual objects in the form of 3D models are integrated into the real scenes, with special cares on the interaction consistency including shadow casting, occlusions, and object animation. A variety of experiments have been implemented, which demonstrate the robustness and efficiency of our approach. Copyright © 2006 John Wiley & Sons, Ltd.

关键词： Virtual reality

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A new wildcard search method for digital dictionary based on mobile platform

A new wildcard search method for digital dictionary based on...

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16th International Conference on Artificial Reality and Telexistence - Workshops, ICAT 2006

作者： Zhou, Xin Xu, Yunlong Chen, Gongming Pan, Zhigeng CAD and CG State Key Lab Zhejiang University School of Computer Science Soochow University

ISBN: (纸本)076952754X

This paper implements a digital dictionary system on the mobile platform and proposes a novel algorithm for the wildcard search problem. Our approach, which is based on the advanced trie tree, performs the wildcard search process in a cut-branch operation, which will reduce the search range largely. Thus, the efficiency of the algorithm is increased radically. In addition, compared with normal trie tree, the advanced one, which includes the fuzzy pointer field, makes it possible that the no-head wildcard search can be processed efficiently without linearly scanning all the word entries in the dictionary. At last, the new algorithm is easy to be implemented and experimental results show high robustness and efficiency on the mobile platform. © 2006 IEEE.

关键词： Efficiency

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Ontology based semantic modeling for Chinese ancient architectures

Ontology based semantic modeling for Chinese ancient archite...

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21st National Conference on Artificial Intelligence and the 18th Innovative Applications of Artificial Intelligence Conference, AAAI-06/IAAI-06

作者： Liu, Yong Xu, Congfu Zhang, Qiong Pan, Yunhe College of Computer Science Zhejiang University CAD and CG State Key Lab of China Hangzhou 310027

ISBN: (纸本)1577352815

Modeling complex architectures is quite challenging. We introduce a novel intelligent system, which can generate semi-style or semi-structure Chinese ancient architectures automatically. By using an ontology based approach to analyze the styles of different architectures, geometry primitives (e.g. point, line, triangle, etc.) are converted into semantic architecture components (e.g. window, gate, roof, etc.) as knowledge. The following modeling process can be performed at different semantic levels, and it is appealing to users having domain knowledge. This intelligent architecture modeling system has been successfully applied in the digital heritage project for ancient architectures in southeast China. Copyright © 2006, American Association for Artificial Intelligence (***). All rights reserved.

关键词： Semantics

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View Dependent Sequential Point Trees

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Journal of computer science & Technology 2006年第2期21卷 181-188页

作者：王文成魏峰吴恩华 State Key Lab of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 P.R. China Department of Computer and Information Science Faculty of Science and Technology University of Macao Macao Special Administration Region P.R. China Graduate University of Chinese Academy of Sciences Beijing 100039 P.R. China

Sequential point trees provide the state-of-the-art technique for rendering point models, by re-arranging hierarchical points sequentially according to geometric errors running on GPU for fast rendering. This paper presents a view dependent method to augment sequential point trees by embedding the hierarchical tree structures in the sequential list of hierarchical points. By the method, two kinds of indices are constructed to facilitate the points rendering in an order mostly from near to far and from coarse to fine. As a result, invisible points can be culled view-dependently in high efficiency for hardware acceleration, and at the same time, the advantage of sequential point trees could be still fully taken. Therefore, the new method can run much faster than the conventional sequential point trees, and the acceleration can be highly promoted particularly when the objects possess complex occlusion relationship and viewed closely because invisible points would be in a high percentage of the points at finer levels.

关键词： view dependence visibility culling GPU point-based rendering real time rendering

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An experimental facial synthesis system using graph cut and gradient domain fusion

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1st International Conference on Technologies for E-Learning and Digital Entertainment (Edutainment 2006)

作者： Jiang, Xiaohong Dai, Fen Jiang, Hanqing College of Computer Science and Technology Zhejiang University China State Key Lab. of CAD and CG Zhejiang University China

ISBN: (纸本)3540334238

Based on the newly appeared image editing and image processing techniques, a novel interactive, computer-assisted system is proposed for facial synthesis. This paper presents the architecture of this facial synthesis system and gives a detailed description of the four key modules. The techniques used in these modules are also particularized. First, graph cut algorithm is used to automatically select region. Then gradient domain fusion is used to get better result. Finally, k-means method is used to improve efficiency. The experimental results show that our experimental facial synthesis system can produce visually good synthesized face images.

关键词： K-means clustering objective stroke background stroke automatic region selection energy minimization graph cut gradient domain fusion

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Interactive mesh deformation with pseudo material effects

Interactive mesh deformation with pseudo material effects

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作者： Huang, Jin Zhang, Hongxin Shi, Xiaohan Liu, Xinguo Bao, Hujun State Key Lab. of CAD and CG Zhejiang University China State Key Lab. of CAD and CG Computer Science School Zhejiang University State Key Laboratory of CAD and CG Zhejiang University

This paper presents a novel interactive mesh deformation method that can achieve various dynamic material effects, including elastic membrane and cloth effects. In our framework, a mesh is encoded by some differential quantities based on edge length and dihedral angle;and the deformation is formulated as a least square problem for preserving the edge length and dihedral angle via the differential quantities. In order to obtain anisotropic material effects, we further propose an edge-weighting scheme based on a user-specified vector field. To avoid specifying the local transformations, we set up an iterative scheme for solving the deformation. At last, several examples are presented to show that our approach can interactively generate visually pleasing deformations. Copyright © 2006 John Wiley & Sons, Ltd.

关键词： Interactive computer graphics

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On the quality of service of failure detectors based on control theory

On the quality of service of failure detectors based on cont...

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20th International Conference on Advanced Information Networking and Applications

作者： Xiong, Naixue Yang, Yan Chen, Jianxun He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology Japan Computer Science and Technology School Wuhan University of Science and Technology China State Key Lab of Software Engineering Computer School Wuhan University China

ISBN: (纸本)0769524664

The detection of failures is a fundamental issue for fault tolerance in distributed systems. Recently, many people have come to realize that failure detection ought to be provided as some form of generic service, similar to IP address lookup. However, this has not been successful so far;one of the reasons being the fact that classical failure detectors were not designed to satisfy several application requirements simultaneously. More specifically, traditional implementations of failure detectors are often tuned for running over local networks and fail to address some important problems found in wide-area distributed systems with a large number of monitored components. In this paper, we study the quality of service (QoS) of failure detectors. We first present a novel failure detector scheme combined with control theory that can help in solving or optimizing some problems. Furthermore, this paper discusses the design and analysis of implementing a scalable failure detection service for such large wide-area distributed systems considering dynamically adjusting the heartbeat streams, so that it satisfies the bottleneck router requirements. We further show how the online failure detector control algorithm can be used to design a controller, analyze the theoretical aspects of the proposed algorithm and verify its agreement. Simulation results show the efficiency of our scheme in terms of high utilization of the bottleneck link fast response and good stability of the bottleneck router buffer occupancy as well as of the controlled sending rates. In conclusion, the new failure detector algorithm provides a better QoS than an algorithm that is proposed by Stelling et al [1, 2].

关键词： Telecommunication services

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A facial expression model for human-like agent

A facial expression model for human-like agent

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2006 IEEE Conference on Robotics, Automation and Mechatronics

作者： Bin, Yang Peifa, Jia State Key Lab. of Intelligent Technology and System Department of Computer Science Tsinghua University Beijing China

ISBN: (纸本)1424400244

A major unsolved problem in human-like agent is the construction and application of realistic human facial expression models. Human-like agents should interact with human by recognizing human facial expression and synthesizing facial expressions to show their emotional states. However there is no a uniform model for both recognition and synthesis of facial expression. In this paper, we present a model for solving this challenging task. First, we setup a muscle-based facial model and use muscles' contraction as controlling factors because all the facial actions are driven by the muscles. An orthogonal facial expression space is constructed by regarding each controlling factor as a dimension. Then muscles' contractions are calculated from facial images to construct the facial vector. Thus the facial vector can be used on the facial expression synthesis system of human-like agent. In this paper, we also present a facial function to describe the dynamic procedure of facial expressions. Last, this paper points out the direction of future work. © 2006 IEEE.

关键词： Anthropomorphic robots

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A new method of interactive marker-driven free form mesh deformation

A new method of interactive marker-driven free form mesh def...

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Geometric Modeling and Imaging New Trends, 2006

作者： Difei, Lu Ying, Zhang Xiuzi, Ye College of Computer Science State Key Lab. of CAD and CG Zhejiang University Hangzhou 310027 China

ISBN: (纸本)0769526047

In this paper, we propose a new scheme for marker-driven free form global mesh deformation without manually establishing a skeleton orfreeform deformation domain beforehand. It allows a user to deform a given mesh interactively and intuitively. Firstly markers are placed at existing mesh vertices. Then user moves markers as constrained handles in a free form style. Next a global shape deformation is obtained by reconstructing the shape corresponding to the translated markers. Finally the system smooth the deformed mesh to get desired result. Our approach successfully conveys a sense of rigidity of the mesh, which is difficult in space-warp approaches. We demonstrate that our system can be used to intuitively deform a complex mesh with very little effort. We also show that our approach of the deformation provides a natural way to interpolate between key frames, allowing production of simple key framed animations. © 2006 IEEE.

关键词： Interactive computer graphics

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