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Fusion tracking in color and infrared images using joint sparse representation

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Science china(information Sciences) 2012年第3期55卷 590-599页

作者： LIU HuaPing1,2.3 & SUN FuChun1,2.3 1Department of computer Science and Technology, tsinghua {2., Beijing 100084, china 2.tate Key Laboratory of Intelligent Technology and Systems, Beijing 100084, china 3tsinghua National Laboratory for information Science and Technology, Beijing 100084, china 1. Department of computer Science and Technology Tsinghua University Beijing 100084 China2. State Key Laboratory of Intelligent Technology and Systems Beijing 100084 China3. Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China

Currently sparse signal reconstruction gains considerable interest and is applied in many fields. In this paper, a similarity induced by joint sparse representation is designed to construct the likelihood function of particle filter tracker so that the color visual spectrum and thermal spectrum images can be fused for object tracking. The proposed fusion scheme performs joint sparse representation calculation on both modalities and the resultant tracking results are fused using min operation on the sparse representation coefficients. In addition, a co-learning approach is proposed to update the reference templates of both modality and enhance the tracking robustness. The proposed fusion scheme outperforms state-of-the-art approaches, and its effectiveness is verified using OTCBVS database.

关键词： joint sparse representation fusion tracking color image infrared image

Shared latent dynamical structure for three-dimensional human pose estimation

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Science china(information Sciences) 2011年第7期54卷 1375-1382页

作者： TONG MingLei 1,HAN Hong 2.& ZHU Wu 1 1 School of computer and information,Shanghai {2. of Electric Power,Shanghai 2.1300,china 2.Institute of Intelligent information Processing,Xidian {2.,Xi’an 710071,china 1. School of computer and information Shanghai University of Electric Power Shanghai 201300 China2. Institute of Intelligent Information Processing Xidian University Xi’an 710071 China

In this paper,a shared latent dynamical model (SLDM) and its application in tracking 3D human motion from monocular videos are proposed by combining the ideas of Gaussian processes dynamical model with shared latent *** tracking in high-dimensional space,SLDM can map state space and observation space to a shared latent space of low dimensionality with associated *** off-line training,three mappings,including dynamical mapping in latent space and mappings from the latent space to both state space and observation space,are *** model can separate traditional human motion estimation in highdimensional space into two steps: In the first step,the shared latent dynamical variables are estimated;in the second step,the human pose of high dimension is *** in human motion tracking from monocular videos using simulations and real images demonstrate that this human tracking method is efficient.

关键词： visual media shared latent dynamical model 3D human pose estimation

Study on NDVI-T_s space by combining LAI and evapotranspiration

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Science china Earth Sciences 2006年第7期49卷 747-754页

作者： HAN Lijuan1,2.3, WANG Pengxin4, YANG Hua1,2.3, LIU Shaomin1,2.3 & WANG Jindi1,2.3 1. Research center for Remote Sensing and GIS, School of Geography, Beijing Normal university, Beijing 100875,{2. 2. State Key Laboratory of Remote Sensing Science, Beijing 100875,{2. 3. Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875,{2. 4. Department of information management, College of information and Electronic Engineering,{2. Agricultural university, Beijing 100083,{2. 1. Research center for Remote Sensing and GIS School of Geography Beijing Normal University Beijing 100875 China 2. State Key Laboratory of Remote Sensing Science Beijing 100875 China 3. Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities Beijing 100875 China 4. Department of information management College of Information and Electronic Engineering China Agricultural University Beijing 100083 China

This paper focuses on interpreting the different spatial relationships between NDVI and Ts, a triangular or a trapezoid, and on analyzing transformation conditions, the physical and ecological meanings of the vegetation index-surface temperature space as well. Further, we use the Tempera-ture-Vegetation Dryness Index (TVDI) to explain the existent meaning of a triangular space after NDVI reaches its saturated state by employing the relationships between NDVI, LAI and evapotranspiration. The specific relations between NDVI and Ts are useful for describing, validating and updating land surface models.

关键词： NDVI, land surface temperature, evapotranspiration, leave area index.

Suitability evaluation for land reclamation in mining area:A case study of Gaoqiao bauxite mine

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中国有色金属学会会刊：英文版 2011年第S3期21卷 506-515页

作者： WANG Shi-dong1, 2. LIU Chang-hua2. ZHANG He-bing2.1. College of Resources Science and Technology, Beijing Normal university, Beijing 100875, china 2. School of Surveying and Land {2. Engineering, Henan Polytechnic university, Jiaozuo 454000, china [a] College of Resources Science and Technology Beijing Normal University Beijing 100875 China [b] School of Surveying and Land information Engineering Henan Polytechnic University Jiaozuo 454000 China

Suitability evaluation plays an important role in land reclamation because the choice of evaluation methods affects the accuracy and objectivity of the suitability evaluation results. Furthermore, it influences the decision-making related to land reclamation. An improved method, which is called limit comprehensive conditions method, was developed after different suitability evaluation methods were studied. Based on this method, the reclaimed land of the Gaoqiao bauxite mining area was evaluated. The Gaoqiao mining area was divided into seven evaluation units that were evaluated respectively by selecting evaluation factors and establishing grade standards. The results show that the proposed method is more applicable and easier to handle. Moreover, its evaluation results are more scientific compared with the traditional evaluation methods. The improved method can be beneficial to the rapid monitoring and the effective management of reclaimed land in the opencast mine area.

关键词： mining area land reclamation suitability evaluation Gaoqiao bauxite mine

(2.n)secret sharing scheme for gray and color images based on Boolean operation

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Science china(information Sciences) 2012年第5期55卷 1151-1161页

作者： DONG Lin 1,WANG DaoShun 1,LI ShunDong 2.& DAI YiQi 1 1 Department of computer Science and Technology,tsinghua {2.,Beijing 100084,china 2.School of computer Science,Shaanxi Normal {2.,Xi'an 710062.china 1. Department of computer Science and Technology Tsinghua University Beijing 100084 China2. School of Computer Science Shaanxi Normal University Xi’an 710062 China

Traditional secret sharing (SS) schemes can reconstruct the secret precisely,but have high com-putation *** secret sharing (VSS) schemes use human visual system to reconstruct the secret without cryptographic computation,but have pixel expansion and loss of *** et *** a (2.n)-SS scheme for binary images based on Boolean operation,which has low computation complexity,no pixel expansion and the contrast is 1/*** this paper,we first construct an r runs (2.n)-SS scheme to improve the contrast of Wang et al.'s binary (2.n)-SS *** we present two approaches to construct r runs (2.n)-SS schemes for grayscale image and color *** two approaches are both based on Boolean operation,while one approach uses halftone technology and the other uses bit level *** proposed schemes have low computation complexity and almost ideal contrast.

关键词： secret sharing scheme Boolean operation halftone contrast

Building a next generation Internet with source address validation architecture

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Science in china(Series F) 2008年第11期51卷 1681-1691页

作者： WU JianPing1,3,REN Gang1,3 & LI Xing2.3 1 Department of computer Science,tsinghua {2.,Beijing 100084,china 2.Department of Electronic Engineering,tsinghua {2.,Beijing 100084,china 3 tsinghua National Laboratory for information Science and Technology(TNList) ,Beijing 100084,china Department of computer Science Tsinghua University Beijing 100084 China Department of Electronic Engineering Tsinghua University Beijing 100084 China tsinghua National Laboratory for information Science and Technology (TNList) Beijing 100084 China

The IP packet forwarding of current Internet is mainly destination based. In the forwarding process, the source IP address is not checked in most *** causes serious security, management and accounting problems. Based on the drastically increased IPv6 address space, a ＂source address validation architecture＂（SAVA） is proposed in this paper, which can guarantee that every packet received and forwarded holds an authenticated source IP address. The design goals of the architecture are lightweight, loose coupling, ＂multi-fence support＂ and incremental deployment. This paper discusses the design and implementation for the architecture, including inter-AS, intra-AS and local subnet. The performance and scalability of SAVA are described. This architecture is deployed into the CNGI-CERNET2.infrastructure a large-scale native IPv6 backbone network of the china Next Generation Internet project. We believe that the SAVA will help the transition to a new, more secure and dependable Internet.

关键词： IP source address validation network architecture network security

Capability of evolutionary cryptosystems against differential cryptanalysis

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Science china(information Sciences) 2011年第10期54卷 1991-2000页

作者： ZHANG HuanGuo 1,2.,LI ChunLei 1,2.& TANG Ming 1,2.1 School of computer,Wuhan university,Wuhan 430072.{2. 2.Key Laboratory of Aerospace information Security and Trusted Computing of Ministry of Education,Wuhan university,Wuhan 430072.{2. 1. School of computer Wuhan University Wuhan 430072 China2. Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education Wuhan University Wuhan 430072 China

The evolutionary cryptosystem is a new *** paper studies its security level resisting against differential *** is shown that the evolutionary cryptosystem possesses higher resistance than its initial fixed cryptosystem against differential *** the basis of the relationship among the data complexity,the bit advantage and the success rate of differential cryptanalysis,it is proven that more data is needed for attacking the evolutionary cryptosystem when the bit advantage and success rate are ***,it is shown that the time complexity for attacking the evolutionary cryptosystem is higher than that of differential attacking its initial fixed cryptosystem with the same amount of plaintext-ciphertext *** research indicates that the evolutionary cryptosystem is more robust than its initial fixed cryptosystem against differential cryptanalysis.

关键词： information security cryptology evolutionary cryptosystem cryptanalysis differential cryptanalysis

Hierarchical Classification of Chinese Documents Based on N grams

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Wuhan university Journal of Natural Sciences 2001年第Z1期6卷 416-422页

作者： Zhou Shui geng 1, Guan Ji hong 2. He Yan xiang 2.1. State Key Laboratory of Software Engineering, Wuhan university, Wuhan 430072. china 2. School of {2. Science, Wuhan university, Wuhan 430072. china State Key Laboratory of Software Engineering Wuhan University Wuhan China School of computer Science Wuhan University Wuhan China

We explore the techniques of utilizing N gram information to categorize Chinese text documents hierarchically so that the classifier can shake off the burden of large dictionaries and complex segmentation processing, and subsequently be domain and time independent. A hierarchical Chinese text classifier is implemented. Experimental results show that hierarchically classifying Chinese text documents based N grams can achieve satisfactory performance and outperforms the other traditional Chinese text classifiers.

关键词： Chinese text classification N grams feature selection hierarchical classification

Spray and forward:Efficient routing based on the Markov location prediction model for DTNs

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Science china(information Sciences) 2012年第2期55卷 433-440页

作者： DANG Fei1,YANG XiaoLong1,2.& LONG KePing2.1 Research center for Optical Internet and Mobile information Networks(COIMIN),{2. of Electronic Science and Technology of china,Chengdu 611731,china 2.School of computer and Communications Engineering,{2. of Science and Technology Beijing,Beijing 100083,china 1. Research center for Optical Internet and Mobile information Networks (COIMIN) University of Electronic Science and Technology of China Chengdu 611731 China2. School of Computer and Communications Engineering University of Science and Technology Beijing Beijing 100083 China

Typical delay tolerant networks(DTNs)often suffer from long and variable delays,frequent connectivity disruptions,and high bit error *** DTNs,the design of an efficient routing algorithm is one of the key *** existing methods improve the accessibility probability of the data transmission by transmitting many copies of the packet to the network,but they may cause a high network *** address the tradeoff between a successful delivery ratio and the network overhead,we propose a DTN routing algorithm based on the Markov location prediction model,called the spray and forward routing algorithm(SFR).Based on historical information of the nodes,the algorithm uses the second-order Markov forecasting mechanism to predict the location of the destination node,and then forwards the data by greedy routing,which reduces the copies of packets by spraying the packets in a particular *** contrast to a fixed mode where a successful-delivery ratio and routing overhead are contradictory,a hybrid strategy with multi-copy forwarding is able to reduce the copies of the packets efficiently and at the same time maintain an acceptable successful-delivery *** simulation results show that the proposed SFR is efficient enough to provide better network performance than the spray and wait routing algorithm,in scenarios with sparse node density and fast mobility of the nodes.

关键词： delay tolerant networks spray and forward Markov position prediction routing algorithm