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Improving PWF method of despeckle in polarimetrie SAR image by fusion based on nonsubsampled contourlet transform

Improving PWF method of despeckle in polarimetrie SAR image ...

2008 International Workshop on Education Technology and Training and 2008 International Workshop on Geoscience and Remote Sensing, ETT and GRS 2008

作者： Zhang, De-Xiang Wu, Xiao-Pei Gao, Qing-Wei Guo, Xiao-Jing The Key Lab. of Intelligent Computing and Signal Processing of Anhui University Hefei China The Institute of Electronic Science Technology of Anhui University Hefei China

ISBN: (纸本)9780769535630

A novel and efficient improving PWF method of speckle reduction in Polarimetrie SAR image by fusion based on nonsubsampled contourlet transform is proposed. First, the three complex elements (HH, HV, and W) of the Polarimetric scattering matrix were decorrelated to form a new elements matrix. Then we show that the sub-band decompositions of the three elements using nonsubsampled contourlet transform, and fusion factor is applied to the decomposed directional high-frequency coefficients to create new sub-band coefficients. Finally, we process and reconstruct multi-resolution contourlet coefficients according to the PWF method. Experimental results show that compared with PWF de-speckling algorithm, the proposed algorithm can achieve an excellent balance between suppresses speckle effectively and preserves image details, and the significant information of original image like textures and contour details is well maintained. © 2008 IEEE.

关键词： Synthetic aperture radar

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A self-recovery fragile watermarking scheme for image authentication with superior localization

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Science in China(Series F) 2008年第10期51卷 1487-1507页

作者： HE HongJie ZHANG JiaShu CHEN Fan Sichuan Key Lab of Signal and Information Processing Southwest Jiaotong University Chengdu 610031 China Information Security and National Computing Grid Lab Southwest Jiaotong University Chengdu 610031 China

To address the problems of the inferior localization and high probability of false rejection in existing self-recovery fragile watermarking algorithms, this paper proposes a new self-recovery fragile watermarking scheme with superior localization, and further discusses the probability of false rejection （PFR） and the probability of false acceptance （PFA） of the proposed scheme. Moreover, four measurements are defined to evaluate the quality of a recovered image. In the proposed algorithm, the original image is divided into 2×2 blocks to improve localization precision and decrease PFR under occurrence of random tampering. The PFR under occurrence of region tampering can be effectively decreased by randomly embedding the watermark of each block in conjunction with a novel method of tamper detection. Compared with the current self-recovery fragile watermarking algorithms, the proposed scheme not only resolves the tamper detection problem of self-embedding watermarking, but also improves the robustness against the random tampering of self-embedding watermarking. In addition, the subjective measurements are provided to evaluate the performance of the self-recovery watermarking schemes for image authentication.

关键词： digital watermarking tamper recovery probability of false rejection probability of false acceptance

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The EEG signal preprocessing based on empirical mode decomposition

The EEG signal preprocessing based on empirical mode decompo...

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2nd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2008

作者： Zhang, De-Xiang Wu, Xiao-Pei Guo, Xiao-Jing Institute of Electronic Science and Technology Anhui University Hefei 230039 China Key Lab. of Intelligent Computing and Signal Processing Anhui University Hefei 230039 China

ISBN: (纸本)9781424417483

The electroencephalogram (EEG) is widely used by physicians for interpretation and identification of physiological and pathological phenomena. However, the EEG signals are often corrupted by power line interferences noise and EMG induced noise. These artifacts strongly influence the utility of recorded EEGs and need to be removed for better clinical diagnosis. How to eliminate the effect of the noise is an important preprocessing problem in signal processing. In this paper, a novel and efficient power interferences reduction algorithm by the recently developed empirical mode decomposition (EMD) for the EEG signal is proposed. The principle of this method consists of decompositions of the EEG signal into a limited number of intrinsic mode function (IMF). This algorithm can effectively detect, separate and remove a wide variety of artifacts from EEG recording. Experimental results show that the proposed EMD-based algorithm is possible to achieve an excellent balance between suppresses power interference and EMG noise effectively and preserves as many target characteristics of original signal as possible.

关键词： Empirical mode decomposition

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Automatically discovering semantic links among documents

Automatically discovering semantic links among documents

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4th International Conference on Semantics, Knowledge, and Grid, SKG 2008

作者： Hai, Zhuge Junsheng, Zhang Key Lab of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Science Beijing China

ISBN: (纸本)9780769534015

Knowing semantic links among documents is the basis for intelligent applications over large-scale document resources. Discovering these semantic links with little human interference is a challenge issue. This paper proposes an approach to automatically discover semantic links in document set based on a probabilistic documentary semantic link network model. The approach has the following advantages: 1) It supports probabilistic relational reasoning. 2) The semantic link networks and relevant rules automatically evolve. 3) It does not rely on any predefined ontology. 4) It can adapt to the update of the adopted techniques. Experiments on document sets of different types (scientific papers and Web pages) and different scales show the proposed approach feasible. The approach can be used to automatically construct semantic overlays on large document sets to support advanced applications like various relational queries on scientific documents. © 2008 IEEE.

关键词： Websites

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A VQ digital watermark algorithm based on T-mixture models segmentation

A VQ digital watermark algorithm based on T-mixture models s...

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2008 IEEE International Conference Neural Networks and signal processing, ICNNSP

作者： Bin, Luo Wei, Gu Hui, Guo Key Lab. of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei Anhui 230039 China University of New South Wales Sydney NSW 2052 Australia

ISBN: (纸本)9781424423118

To improve codebook quality in the process of vector quantization, the paper proposes a novel codebook generation algorithm which is based on image segmentation using t-mixture models and greedy EM algorithm. Additionally, in the initial codebook generating procedure, the PNN algorithm is used to reduce LBG algorithm's sensitivity to initial codebook. Experimental results show that the proposed algorithm not only significantly improves codebook quality, but also preserves most details of the original image. An even more important feature is that the proposed algorithm is robust to common image processing operations such as cropping, sharpening and filtering. © 2008 IEEE.

关键词： Image segmentation

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Sgde-gep: A novel algorithm of gep

Sgde-gep: A novel algorithm of gep

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International Conference on Computer Science and Software Engineering, CSSE 2008

作者： Peng, Yu-Zhong Yuan, Chang-An Wang, Yan Qin, Xiao Key Lab of Scientific Computing Intelligent Information processing in Universities of Guangxi Guangxi Teachers Education University Nanning China

ISBN: (纸本)9780769533360

Traditional GEP algorithm takes up many system resources in decoding and evaluating due to the operation of the tree construction and corresponding traversing. This paper aims to introduce a novel GEP algorithm to alleviate the drawback mentioned above. The main contributions include:(1) presenting a new method for decoding and evaluating chromosome (SGDE), and proposing the corresponding ETs construction schema;(2) proving the relative natures of SGDE-GEP;(3)The experiments showed that the average efficiency of SGDE-GEP can be raised from 18.94% to 23.11% compared with the traditional GEP. © 2008 IEEE.

关键词： Trees (mathematics)

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Verification algorithm of a sequential circuit's equivalence based on state transfer graph

Verification algorithm of a sequential circuit's equivalence...

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2nd International Symposium on Information Technologies and Applications in Education, ISITAE 2008

作者： Li, Wei Yang, Desheng Lu, Ying Zhang, Yichao Institute of Computer Science and Technology Anhui University Hefei China Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China

ISBN: (纸本)9780863419133

An equivalence verification algorithm of sequential circuits [1] based on state transfer graph (STG) is presented in this paper, which obtains some certain useful information through verifying the corresponding state transfer graphs' isomorphism, namely that two corresponding sequential circuits' equivalence . And the verifying includes two steps: firstly, find out all state pairs of the vertexes, which are being verified;secondly verify the equivalence of state pairs, if all the state pairs can be matched as equal state pairs, thus we can come to a conclusion that the corresponding circuits have the same sequential behavior. The algorithm mainly verifies ISCAS85 circuits and some simple state transfer graphs, and the final experiment data shows that the algorithm introduced in the paper will obtain better results compared to BDD(Binary Decision Diagram) and SET(Symbolic Trajectory Evaluation) methods. © 2008 IET.

关键词： Timing circuits

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A novel watermarking scheme based on relationship of tchebichef moments

A novel watermarking scheme based on relationship of tchebic...

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2008 IEEE International Conference Neural Networks and signal processing, ICNNSP

作者： Wanli, Lv Yutang, Guo Jixin, Ma Bin, Luo Key Lab. of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei 230039 China Computer Department Anhui Institute of Education Hefei 230061 China School of Computing and Mathematical Sciences University of Greenwich United Kingdom

ISBN: (纸本)9781424423118

In this paper, a novel watermarking scheme based on relationship of Tchebichef Moments is proposed. Firstly, the image is divided into blocks;then the Tchebichef moment's relationship of each block is computed, which is computed rapidly with the help of the look-up-table;finally, the Tchebichef moments of each block are modified to embed watermark. The watermark extraction is the reverse procedure of the watermark embedding and the original image is not necessary in the watermark detection. Experimental results demonstrate that the proposed watermarking technique is robustness to attacks such as JPEG compress, noises, luminance and contrast enhancement and low pass filtering. ©2008 IEEE.

关键词： Low pass filters

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A Novel Technique of Image-Based Camera Calibration in Depth-from-Defocus

A Novel Technique of Image-Based Camera Calibration in Depth...

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International Workshop on intelligent Networks and intelligent Systems (ICINIS)

作者： Quanbing Zhang Yanyan Gong Key Lab of Intelligent Computing and Signal Processing of Ministry of Education Anhui University Hefei China

In this paper, a novel camera parameters calibration algorithm is proposed by exploiting defocus information. The proposed algorithm is based on two defocus images of the same scene obtained by changing camera's aperture numbers. Both images can be arbitrarily blurred. The blur difference between the two defocused images was estimated. Combining with imaging geometry of the thin lens, the corresponding camera parameters can be calibrated. This proposed algorithm remove the limit of calibration algorithm given by Soon-Yong Park that one of the images used in calibration must be focused. And it is valid without process of scale normalization. The calibrated parameters yield consistent results in depth estimation. Experimental results on synthetic and real images are presented to demonstrate the effectiveness of the proposed algorithm.

关键词： Calibration signal processing algorithms Layout Design for disassembly intelligent networks Lenses Focusing Smart cameras Apertures intelligent systems

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A novel DMD display of phase-only coding hologram

A novel DMD display of phase-only coding hologram

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International Conference on intelligent Computation Technology and Automation, ICICTA 2008

作者： Han, Chao Wei, Sui Liu, Kaifeng Key Laboratory of Opto-electronic Information Acquisition and Manipulation Ministry of Education Anhui University Hefei 230039 China Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei 230039 China

ISBN: (纸本)9780769533575

In order to reduce the complexity of hologram generation and holographic display, for the first time the paper combines Gerchberg-Saxton iterative algorithm with Lohmann coding to make phase-only hologram and designs a digital micromirror device (DMD) display system. Thus we not only solve the problem that the amplitude of the frequency spectrum of object function fluctuates very greatly but also avoid the complicated process for producing hologram produced by the plotter, which is controlled by computer. And by this method we can further avoid the complicated technology by etching silicon crystal and improve the quality of imaging. © 2008 IEEE.

关键词： Holograms

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