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6th ACM International Conference on Image and Video Retrieval, CIVR 2007

作者： Liu, Xiaobing Wang, Dong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Technology and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)1595937331

In this paper, we are motivated to augment the holistic histogram representation with implicit spatial constrains. To be more concrete, we aim atending a good match function for the problem of object/scene categorization which considers the spatial constraints against heavy clutter and occlusion. Our solution is a partial match kernel under the histogram representation which varies simultaneously at both the feature and spatial resolutions, named as the Feature and Spatial Covariant (FESCO) kernel. Both the FESCO kernel and its late fusion alternative achieve better match accuracy than Spatial Pyramid Match[13] and Pyramid Match[11]. We also apply the keypoint features to video indexing. And on a large scale TRECVID data sets of over 300 hours videos, to our best knowledge, this approach achieves the state-of-the-art result for a single feature. Copyright 2007 ACM.

关键词： Image matching

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Topology-consistent design for 3D freeform meshes with harmonic interpolation

Topology-consistent design for 3D freeform meshes with harmo...

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6th International Conference of Entertainment Computing, ICEC 2007

作者： Bin, Sheng Enhua, Wu Faculty of Science and Technology University of Macau Macao China State Key Lab of Computer Science Institute of Software Chinese Academy of Sciences Beijing China

ISBN: (纸本)3540748725

One of the most exciting aspects of shape modeling is the development of new algorithms and methods to create unusual, interesting and aesthetically pleasing shapes. In this paper, we present an interactive modeling system for generating freeform surfaces using a 2D user interface. In this paper, we firstly interpret the given 2D curve to be the projection of the 3D curve that has the minimum curvature. Then we propose a topology-consistent strategy to trace the simple faces on the interconnecting 3D curves. By using the face tracing algorithm, our system can identify the 3D surfaces automatically. After obtaining the boundary curves for the faces, we apply Delaunay triangulation on these faces. Finally, the shape of the triangule surface mesh that follows the 3D boundary curves is computed by using harmonic interpolation. Solving Laplace's equations, we are able to construct simple and conceptual 3D models interactively. Although the incorporation of topological manipulation will introduce many new(and interesting) design problems that cannot be addressed in this paper, we show that automatically generated models are both beneficial and feasible. © IFIP International Federation for Information Processing 2007.

关键词： Mesh generation

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Video diver: Generic video indexing with diverse features

Video diver: Generic video indexing with diverse features

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International Multimedia Conference, MM'07 - 9th ACM SIG Multimedia International Workshop on Multimedia Information Retrieval, MIR'07

作者： Wang, Dong Liu, Xiaobing Luo, Linjie Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781595937780

Semantic video indexing is critical for practical video retrieval systems and a generic and scalable indexing framework is a must for indexing a large semantic lexicon with over 1000 concepts present. This paper fully explores the idea of incorporating many kinds of diverse features into a single framework, combining them altogether to obtain larger degree of invariance which is absent in any of the component features, and thus achieves genericness and scalability. We scale down the formidable computational expense with a clever design of the classification and fusion schemes. To be specific, ~20 kinds of diverse features are extracted to capture limited yet complementary variance in color, texture and edge with spatial constraints implicitly integrated, and over 100 classifiers are built subsequently and fused to produce a generic detector. The extensive experiments on a total of 310 hours of TRECVID news videos show that the proposed framework yields significantly improved performance over that of the best single feature across a variety of concepts. Moreover, a benchmark comparison demonstrates that this approach is state-of-the-art. Meanwhile, the proposed approach generalizes well over previously unseen programs and stations and scales well to a lexicon of over 300 concepts in the LSCOM [18] ontology. Copyright 2007 ACM.

关键词： Indexing (of information)

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Video search in concept subspace: A text-like paradigm 07

Video search in concept subspace: A text-like paradigm

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6th ACM International Conference on Image and Video Retrieval, CIVR 2007

作者： Li, Xirong Wang, Dong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)1595937331

Though both quantity and quality of semantic concept detection in video are continuously improving, it still remains unclear how to exploit these detected concepts as semantic indices in video search, given a specific query. In this paper, we tackle this problem and propose a video search framework which operates like searching text documents. Noteworthy for its adoption of the well-founded text search principles, this framework first selects a few related concepts for a given query, by employing a tf-idf like scheme, called c-tf-idf, to measure the informativeness of the concepts to this query. These selected concepts form a concept subspace. Then search can be conducted in this concept subspace, either by a Vector Model or a Language Model. Further, two algorithms, i.e., Linear Summation and Random Walk through Concept-Link, are explored to combine the concept search results and other baseline search results in a reranking scheme. This framework is both effective and efficient. Using a lexicon of 311 concepts from the LSCOM concept ontology, experiments conducted on the TRECVID 2006 search data set show that: when used solely, search within the concept subspace achieves the state-of-the-art concept search result;when used to rerank the baseline results, it can improve over the top 20 automatic search runs in TRECVID 2006 on average by approx. 20%, on the most significant one by approx. 50%, all within 180 milliseconds on a normal PC. Copyright 2007 ACM.

关键词： Semantics

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The importance of query-concept-mapping for automatic video retrieval

The importance of query-concept-mapping for automatic video ...

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15th ACM International Conference on Multimedia, MM'07

作者： Wang, Dong Li, Xirong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781595937025

A new video retrieval paradigm of query-by-concept emerges recently. However, it remains unclear how to exploit the detected concepts in retrieval given a multimedia query. In this paper, we point out that it is important to map the query to a few relevant concepts instead of search with all concepts. In addition, we show that solving this problem through both text and image inputs are effective for search, and it is possible to determine the number of related concepts by a language modeling approach. Experimental evidence is obtained on the automatic search task of TRECVID 2006 using a large lexicon of 311 learned semantic concept detectors. Copyright 2007 ACM.

关键词： Image retrieval

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Pseudo trust: Zero-knowledge based authentication in anonymous peer-to-peer protocols

Pseudo trust: Zero-knowledge based authentication in anonymo...

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21st International Parallel and Distributed Processing Symposium, IPDPS 2007

作者： Lu, Li Han, Jinsong Hu, Lei Huai, Jinpeng Liu, Yunhao Ni, Lionel M. State Key Lab. of Information Security Graduate School Chinese Academy of Sciences Beijing China Dept. of Computer Science and Engineering Hong Kong University of Science and Technology Kowloon Hong Kong School of Computer Science Beihang University Beijing China State Key Lab. of Software Developing Environment Beihang University Beijing China

ISBN: (纸本)1424409101

Most of the current trust models in peer-to-peer (P2P) systems are identity based, which means that in order for one peer to trust another, it needs to know the other peer's identity. Hence, there exists an inherent tradeoff between trust and anonymity. To the best of our knowledge, there is currently no P2P protocol that provides complete mutual anonymity as well as authentication and trust management. We propose a zero-knowledge authentication scheme called Pseudo Trust (PT), where each peer, instead of using its real identity, generates an unforgeable and verifiable pseudonym using a one-way hash function. A novel authentication scheme based on Zero-Knowledge Proof is designed so peers can be authenticated without leaking any sensitive information. With the help of PT, most existing identity-based trust management schemes become applicable in mutual anonymous P2P systems. We analyze the levels of security and anonymity in PT, and evaluate its performance using trace-driven simulations and a prototype implementation. The strengths of Pseudo Trust include the lack of need for a centralized trusted party or CA, high scalability and security, low traffic and cryptography processing overheads, and man-in-middle attack resistance. We aim for the Pseudo Trust design to be included in the P2P trust and anonymity context. © 2007 IEEE.

关键词： Distributed computer systems

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Universal approximation for Takagi-Sugeno fuzzy systems using dynamically constructive method-SISO cases

Universal approximation for Takagi-Sugeno fuzzy systems usin...

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2007 IEEE 22nd International Symposium on Intelligent Control, ISIC 2007

作者： Fuchun, Sun Ni, Zhao IEEE Dept. of Computer Science and Technology State Key Lab. of Intelligent Technology and Systems Tsinghua University Beijing 100084 China

ISBN: (纸本)142440441X

In this paper, a dynamically constructive method is proposed for proving the universal approximation for single input/single output (SISO) Takagi-Sugeno (T-S) fuzzy systems, which is superior to the existing constructive methods only considering the global property of the function to be approximated and also unrelated to the membership functions of fuzzy sets. The dynamically constructive method proposed not only considers the different property of the nonlinear function in different areas, but also the membership functions of fuzzy sets in fuzzy rules. As a result, the number of rules in the constructed T-S model is greatly reduced. Finally some simulation examples confirm that the T-S fuzzy model constructed by our method with small size rule base can approximate the given nonlinear functions at high accuracy as compared with some typical methods. © 2007 IEEE.

关键词： Fuzzy rules

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A CDD-based formal model for expert finding

A CDD-based formal model for expert finding

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16th ACM Conference on Information and Knowledge Management, CIKM 2007

作者： Fu, Yupeng Xiang, Rongjing Liu, Yiqun Zhang, Min Shaoping, Ma. State Key Lab of Intelligent Technology and Systems Tsinghua University Beijing China Department of Computer Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9781595938039

Searching an organization's document repositories for experts is a frequently faced problem in intranet information management. This paper proposes a candidate-centered model which is referred as Candidate Description Document (CDD)-based retrieval model. The expertise evidence about an expert candidate scattered over repositories is mined and aggregated automatically to form a profile called the candidate's CDD, which represents his knowledge. We present the model from its foundations through its logical development and argue in favor of this model for expert finding. We devise and compare the different strategies for exploring a variety of expertise evidence. The experiments on TREC enterprise corpora demonstrate that the CDD-based model achieves significant and consistent improvement on performance through comparative studies with non-CDD methods. Copyright 2007 ACM.

关键词： Knowledge management

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Performance comparison of point-tree structured genetic programming in symbolic regression and parameter identification

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Journal of Harbin Institute of Technology (New Series) 2007年第SUPPL. 2期14卷 106-109页

作者： Wang, Weiwu Li, Yuanxiang Tong, Yala Dai, Zhifeng State Key Lab. of Software Engineering Wuhan University Wuhan 430072 China School of Science Hubei University of Technology Wuhan 430068 China School of Computer Wuhan University Wuhan 430079 China

Point-Tree Structured Genetic Programming (PTGP) is designed for solving discontinuous function's regression problem. In this paper, we apply this method to identify the discontinuous parameter in a parabolic differential equation, and then compare the performance of PTGP in the direct regression task and the identification task. The results show that PTGP is a robust problem solver. It can be easily adapted to the identification task and automatically find the way which leads to the optimal solution. In the performance comparison, PTGP performs a little better in the direct regression than the identification. We suggest that it is caused by the complexity of problem itself, that is, the identification task is more complex than the regression task.

关键词： Genetic programming

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A steep thermodynamical selection rule for evolutionary algorithms

A steep thermodynamical selection rule for evolutionary algo...

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7th International Conference on Computational science, ICCS 2007

作者： Ying, Weiqin Li, Yuanxiang Peng, Shujuan Wang, Weiwu State Key Lab. of Software Engineering Wuhan University Wuhan 430072 China School of Computer Science Wuhan University Wuhan 430079 China

ISBN: (纸本)9783540725893

The genetic algorithm (GA) often suffers from the premature convergence because of the loss of population diversity at an early stage of searching. This paper proposes a steep thermodynamical evolutionary algorithm (STEA), which utilizes a steep thermodynamical selection (STS) rule. STEA simulates the competitive mechanism between energy and entropy in annealing to systematically resolve the conflicts between selective pressure and population diversity in GA. This paper also proves that the rule STS has the approximate steepest descent ability of the free energy. Experimental results show that STEA is both far more efficient and much stabler than the thermodynamical genetic algorithm (TDGA). © Springer-Verlag Berlin Heidelberg 2007.

关键词： Evolutionary algorithms

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