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Urban road network extraction from SAR image

Urban road network extraction from SAR image

MIPPR 2007: Remote Sensing and GIS Data Processing and Applications;and Innovative Multispectral technology and Applications

作者： Cheng, Pengxue Hu, Maolin Lab. of Intelligent Computing and Signal Processing Anhui University Hefei Anhui 230039 China Key Laboratory of Wireless Sensor Network and Communication Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

ISBN: (纸本)9780819469540

In this paper, a technique for the extraction of roads in a high resolution synthetic aperture radar (SAR) image is presented. And a three-step method is developed for the extraction of road network from space borne SAR image: the process of the feature points, road candidate detection and connection. Roads in a high resolution SAR image can be modeled as a homogeneous dark area bounded by two parallel boundaries. Dark areas, which represent the candidate positions for roads, are extracted from the image by a Gaussian probability iteration segmentation. Possible road candidates are further processed using the morphological operators. And the roads are accurately detected by Hough Transform, and the extraction of lines is achieved by searching the peak values in Hough Space. In this process, to detect roads more accurately, post-processing, including noisy dark regions removal and false roads removal is performed. At last, Road candidate connection is carried out hierarchically according to road established models. Finally, the main road network is established from the SAR image successfully. As an example, using the ERS-2SAR image data, automatic detection of main road network in Shanghai Pudong area is presented.

关键词： Feature extraction

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Point matching of two images under large different resolution

Point matching of two images under large different resolutio...

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MIPPR 2007: Automatic Target Recognition and Image Analysis;and Multispectral Image Acquisition

作者： Ruan, Lei Hu, Maolin Lab. of Intelligent Computing and Signal Processing AnHui University Hefei AnHui 230039 China Key Laboratory of Wireless Sensor Network and Communication Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

ISBN: (纸本)9780819469502

Image matching is the first step in almost any 3D computer vision task, and hence has received extensive attention. In this paper, the problem is addressed from a novel perspective, which is different from the classic stereo matching paradigm. Two images with different resolutions, that is high resolution versus low resolution are matched. Since the high resolution image only corresponds to a small region of the low resolution one, the matching task therefore consists in finding a small region in the low resolution image that can be assigned to the whole high resolution image under the plane similarity transformation, which can be defined by the local area correlation coefficient to match the interest points and rectified by similarity transform. Experiment shows that our matching algorithm can be used for scale changing up to a factor of 6. And it is successful to deal with the point matching between two images under large scale.

关键词： Image matching

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Cryptanalysis of a robust protocol for generating shared RSA parameters

Cryptanalysis of a robust protocol for generating shared RSA...

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2007 IET Conference on Wireless, Mobile and Sensor networks (CCWMSN07)

作者： Fanyu Kong Jia Yu Guangqing Zhang Daxing Li Ministry of Education Key Laboratory of Cryptographic Technology and Information Security Jinan China Institute of Network Security Shandong University Jinan China College of Information Engineering Qingdao University of China Qingdao China

At IMA-Crypto & Coding' 99, A. M. Barmawi et al. proposed a robust protocol for generating shared RSA parameters, which was claimed to be secure and robust from cheaters and malicious parties. In this paper, we propose a cryptanalysis of A. M. Barmawi's protocol and show that every valid participating party can recover the factorization of the RSA modulus N with the computational complexity O(log 3 N). Therefore, the secret RSA key parameters p, q, d axe exposed to all the participating parties and A. M. Barmawi' s protocol is totally broken.

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A Partial Coverage Based Approach to Classification

A Partial Coverage Based Approach to Classification

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Yu Huang Gongde Guo Daniel Neagu School of Mathematics and Computer Science Fujian Normal University Fuzhou Fujian China Key Laboratory of Network Security and Cryptography Fujian Normal University Fuzhou Fujian China Department of Computing University of Bradford West Yorkshire UK

The k-nearest neighbour (kNN) method is simple but effective for classification. The bottleneck of kNN is it needs a good similarity measure which could be problematic in some cases especially for datasets containing categorical data. In this paper, a partial coverage based classificaiton (PCC) method is proposed which works without similarity measure and conversion for categorical data. Moreover, the PCC method is easy to be implemented. Experiments were carried out on some public datasets collected from the UCI machine learning repository. The experimental results show that the proposed method is better than some classical classificaiton algorithms in terms of classification accuracy. The PCC is a quite promising method for classification.

关键词： Merging Distortion measurement Support vector machines Support vector machine classification Artificial intelligence Mathematics Computer science Laboratories Computer security Data security

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Research on Usage Control Model with Delegation Characteristics Based on OM-AM Methodology

Research on Usage Control Model with Delegation Characterist...

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IFIP International Conference on network and Parallel computing Workshops (NPC Workshops)

作者： Zhiyong Zhang Lin Yang Qingqi Pei Jianfeng Ma Key Laboratory of Computer Network and Information Security Ministry of Education Xidian University Xi'an China Electron. Information Engineering Coll. Henan University of Science and Technology Luoyang China The Research Institute Renesas Technology Corporation Beijing China

UCON ABC is a basic framework of next generation access control policy Usage Control that is composed of Authorization-oBlige-Condition components, but so far it lacks of important delegation characteristic. The paper analyses the behaviors of delegation in UCON based on OM-AM engineering principles, presents a formalized usage control model with delegation features using BNF Extensions, called as UCON D , and further articulates its hybrid architecture based on Client & Server Delegation Reference Monitors and relative key protocol functions. UCON D is an extension model of UCON ABC in the aspect of delegation authorization, and it resolves the delegation question of Usage Control Model. Moreover, we specify delegation procedure of an application for Digital Medium Resource Distribution System.

关键词： Access control Information security Authorization Resource management Mechanical factors Access protocols Environmental management Design engineering Parallel processing Laboratories

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Robust Disaster Recovery System Model

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 170-174页

作者： WANG Kun SU Rui-dan LI Zeng-xin CAI Zhen ZHOU Li-hua Key Laboratory of Computer Network and Information Security of the Ministry of Education Xidian University Xi＇ an 710071 Shaanxi China National Information Security Engineering and Technology Research Center Beijing 100093 China

Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model （RDRSM）. Through strengthening the ability of safe communications, RDRSM guarantees the secure and reliable command on disaster recovery. Its self-supervision capability can monitor the integrality and security of disaster recovery system itself. By 2D and 3D rea-time visible platform provided by GIS, GPS and RS, the model makes the using, management and maintenance of disaster recovery system easier. RDRSM possesses predominant features of security, robustness and controllability. And it can be applied to highly security-critical environments such as E-government and bank. Conducted by RDRSM, an important E-government disaster recovery system has been constructed successfully. The feasibility of this model is verified by practice. We especially emphasize the significance of some components of the model, such as risk assessment, disaster recovery planning, system supervision and robust communication support.

关键词： continuous service E-government information security disaster recovery high availability risk assessment data backup

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Study of dynamic timeout strategy based on flow rate metrics in high-speed networks 06

Study of dynamic timeout strategy based on flow rate metrics...

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1st International Conference on Scalable Information Systems, InfoScale '06

作者： Zhou, Ming-Zhong Gong, Jian Ding, Wei Southeast Univ. and Jiangsu Province Key Laboratory of Computer Networking Technology and Jiangsu Province Key Laboratory of Network and Information Security Nanjing Jiangsu China

ISBN: (纸本)1595934286

The measurements based on flow characteristics are playing more and more important roles in the analysis of network Behavior. As one of main methods for flow recognition, the timeout strategies have a significant impact on the correctness and performance of flow measurements. This paper discusses the state-of-art of flow timeout strategies, and explains where they are applicable and their shortcomings. To deal with short flows that take a large part of the total flows in the networks, the paper proposes the Dynamic Timeout Strategy (DToS) by analyzing flows distribution and flow rate metrics in details. The studies show that this method can improve the performances of network measurement and the efficiency of the resource usage by using different timeout strategics to deal with flows that have different rate features based on integrated usage analyses of target network.s It can also apperceive network abnormal behavior efficiently, and then take emergent measures to ensure the safety of measurement system. Some experiments have been carried out to show the rationality of DToS strategy. The applicable area of this strategy is also analyzed at the end of this paper. © 2006 ACM.

关键词： Data flow analysis

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Information-Theoretic Secure Verifiable Secret Sharing over RSA Modulus

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Wuhan University Journal of Natural Sciences 2006年第6期11卷 1849-1852页

作者： QIU Gang WANG Hong WEI Shimin XIAO Guozhen State Key Laboratory of Integrated Sevice Network Xidian University Xi＇an 710071 Shaanxi China State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China Department of Computer Science and Technology Huaibei Coal Normal College Huaibei 235000 Anhui China

The well-known non-interactive and information-theoretic secure verifiable secret sharing scheme presented by Pedersen is over a large prime. In this paper, we construct a novel non-interactive and information-theoretic verifiable secret sharing over RSA （Rivest, Shamir, Adleman） modulus and give the rigorous security proof. It is shown how to distribute a secret among a group such that any set of k parties get no information about the secret. The presented scheme is generally applied to constructions of secure distributed multiplication and threshold or forward-secure signature protocols.

关键词： verifiable secret sharing information-theoretic secure commitment RSA （Rivest, Shamir, Adleman） modulus

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Fuzzy Model for Trust Evaluation

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Railway Engineering Science 2006年第1期000卷 23-28页

作者： Zhang Shibin He Dake Information Security and National Computing Grid Laboratory Southwest Jiaotong University Chengdu 610031 China Department of Network Engineering Chengdu University of Information Technology Chengdu 610225 China Information Security and National Computing Grid Laboratory Southwest Jiaotong University Chengdu 610031 China

Based on fuzzy set theory, a fuzzy trust model is established by using membership function to describe the fuzziness of trust. The trust vectors of subjective trust are obtained based on a mathematical model of fuzzy synthetic evaluation. Considering the complicated and changeable relationships between various subjects, the multi-level mathematical model of fuzzy synthetic evaluation is introduced. An example of a two-level fuzzy synthetic evaluation model confirms the feasibility of the multi-level fuzzy synthesis evaluation model. The proposed fuzzy model for trust evaluation may provide a promising method for research of trust model in open networks.

关键词： Trust model Trust vector Trust class Synthetic evaluation Fuzzy set theory

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Fuzzy Model for Trust Evaluation

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Journal of Southwest Jiaotong University(English Edition) 2006年第1期14卷 23-28页

作者：张仕斌何大可 Information Security and National Computing Grid Laboratory Southwest Jiaotong University Chengdu 610031 ChinaDepartment of Network Engineering Chengdu University of Information Technology Chengdu 610225 China Information Security and National Computing Grid Laboratory Southwest Jiaotong University Chengdu 610031 China

关键词： Trust model Trust vector Trust class Synthetic evaluation Fuzzy set theory

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