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Infrared small target detection based on modified local entropy and EMD

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Chinese Optics Letters 2010年第1期8卷 24-28页

作者：邓鹤刘建国陈忠 institute for pattern recognition and Artificial intelligence Huazhong University of Science and Technology

Image entropy and empirical mode decomposition （EMD） are effective methods for target detection. EMD algorithm is a powerful tool for adaptive multiscale analysis of nonstationary signals. A new technique based on EMD and modified local entropy is proposed in small target detection under sea-sky background. With the EMD algorithm, it is valid to estimate the background and get the target image by removing the background from the original image and segmenting the target based on the modified local entropy method. The data analysis and experiments show the validity of the proposed algorithm.

关键词： Algorithms Entropy Target drones

New Layered SOA-Based Architecture for Multi-robots Cooperative Online SLAM

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Chinese Journal of Electronics 2014年第1期23卷 25-30页

作者： CAI Yunfei TANG Zhenmin ZHAO Chunxia institute of pattern recognition and Artificial intelligence Nanjing University of Science and Technology

A new layered multi-robots architecture for cooperative online simultaneous localization and mapping based on Service-oriented architecture(SOA) is proposed. This architecture is constructed by the concepts of service-oriented and loosely coupled center *** methods make robots' underlying function realization be transparent in cooperation and avoid the impact affected by robot heterogeneous characteristics, which will be beneficial to the system construction, expansion, restructuring and maintenance. All data packages follow the SOA unified data format, which can avoid the impact affected by sensor heterogeneous characteristics. The point to point serving model reduces the path of data transmission which can improve the timeliness of the system. All of these features can satisfy the requirements of multi-robots cooperative online SLAM. The simulation results show the feasibility, applicability and practicability of this architecture.

关键词： Service-oriented architecture(SOA) Multi-robot cooperative online SLAM(MRCO-SLAM) Loosely coupled

A new approach of formation navigation derived from multi-robots cooperative online FastSLAM

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控制理论与应用（英文版） 2012年第4期10卷 451-457页

作者： Yunfei CAI Zhenmin TANG Chunxia ZHAO institute of pattern recognition and Artificial intelligence Nanjing University of Science and Technology

A new formation navigation approach derived from multi-robots cooperative online FastSLAM is proposed. In this approach, the leader and follower robots are defined. The posteriori estimation of the leader robot state is treated as a relative reference for all follower robots to correct their state priori estimations. The control volume of individual follower will be achieved from the results of the corrected estimation. All robots are observed as landmarks with known associations by the others and are considered in their landmarks updating. By the method, the errors of the robot posterior estimations are reduced and the formation is well kept. The simulation and physical experiment results show that the multi-robots relative localization accuracy is improved and the formation navigation control is more stable and efficient than normal leader-following strategy. The algorithm is easy in implementation.

关键词： Multi-robots Formation navigation FastSLAM

Improved multilevel filters to enhance infrared small target

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Chinese Optics Letters 2011年第5期9卷 27-29页

作者：汪小平张天序颜露新王曼吴家伟 institute for pattern recognition and Artificial intelligence Huazhong University of Science and Technology School of Electronic Information Engineering Beihang University

We propose improved multilevel filters （IMLFs） involving the absolute value operation into the algorithmic framework of traditional multilevel filters （MLFs） to improve the robustness of infrared small target enhancement techniques under a complex infrared cluttered background. Compared with the widely used small target enhancement methods which only deal with bright targets, the proposed technique can enhance the infrared small target, whether it is bright or dark. Experimental results verify that the proposed technique is efficient and practical.

关键词： Improved multilevel filters to enhance infrared small target

Fast hybrid fitting energy-based active contour model for target detection

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Chinese Optics Letters 2011年第7期9卷 29-32页

作者：王登位张天序颜露新 State Key Laboratory for Multispectral Information Processing Technologies Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology

A novel hybrid fitting energy-based active contour model in the level set framework is proposed. The method fuses the region and boundary information of the target to achieve accurate and robust detection performance. A special extra term that penalizes the deviation of the level set function from a signed distance function is also included in our method. This term allows the time-consuming redistancing operation to be removed completely. Moreover, a fast unconditionally stable numerical scheme is introduced to solve the problem. Experimental results on real infrared images show that our method can improve target detection performance efficiently in terms of the number of iterations and the wasted central processing unit （CPU） time.

关键词： Infrared imaging Program processors

Degeneracy from Twisted Cubic Under Two Views

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Journal of Computer Science & Technology 2010年第5期25卷 916-924页

作者：吴毅红兰添胡占义 National Laboratory of pattern recognition Institute of AutomationChinese Academy of Sciences

Fundamental matrix,drawing geometric relationship between two images,plays an important role in 3- dimensional computer *** configurations of the space points and the two camera optical centers affect stability of computation for fundamental *** order to robustly estimate fundamental matrix,it is necessary to study these degenerate *** analyze all the possible degenerate configurations caused by twisted cubic and give the corresponding degenerate rank for each *** with general degeneracies,the previous ruled quadric degeneracy and the homography degeneracy,are also reported.

关键词： fundamental matrix twisted cubic ruled quadric degenerate configuration

Linguistic Theory Based Contextual Evidence Mining for Statistical Chinese Co-Reference Resolution

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Journal of Computer Science & Technology 2007年第4期22卷 608-617页

作者：赵军刘非凡 National Laboratory of pattern recognition Institute of AutomationChinese Academy of Sciences

Under statistical learning framework, the paper focuses on how to use traditional linguistic findings on anaphora resolution as a guide for mining and organizing contextual features for Chinese co-reference resolution. The main achievements are as follows. （1） In order to simulate ＂syntactic and semantic parallelism factor＂, we extract ＂bags of word form and POS＂ feature and ＂bag of seines＂ feature from the contexts of the entity mentions and incorporate them into the baseline feature set. （2） Because it is too coarse to use the feature of bags of word form, POS tag and seme to determine the syntactic and semantic parallelism between two entity mentions, we propose a method for contextual feature reconstruction based on semantic similarity computation, in order that the reconstructed contextual features could better approximate the anaphora resolution factor of ＂Syntactic and Semantic Parallelism Preferences＂. （3） We use an entity-mention-based contextual feature representation instead of isolated word-based contextual feature representation, and expand the size of the contextual windows in addition, in order to approximately simulate ＂the selectional restriction factor＂ for anaphora resolution. The experiments show that the multi-level contextual features are useful for co-reference resolution, and the statistical system incorporated with these features performs well on the standard ACE datasets.

关键词： natural language processing information extraction co-reference resolution anaphora resolution

Combining clustering and classification for remote-sensing images using unlabeled data

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Chinese Optics Letters 2011年第1期9卷 41-44页

作者：边小勇张天序张晓龙 institute for pattern recognition and Artificial intelligence Huazhong University of Science and Technology School of Computer Science and Technology Wuhan University of Science and Technology

A joint clustering and classification approach is proposed. This approach exploits unlabeled data for efficient clustering, which is applied in the classification with support vector machine （SVM） in the case of small-size training samples. The proposed method requires no prior information on data labels, and yields better cluster structures, Through cluster assumption and the notions of support vectors, the most confident k cluster centers and data points near the cluster boundaries are labeled and used to train a reliable SVM classifier. Our method gains better estimation of data distributions and mitigates the unrepresentative problem of small-size training samples. The data set collected from Landsat Thematic Mapper （Landsat TM-5） validates the effectiveness of the proposed approach.

关键词： Remote sensing Support vector machines

Speckle reduction of SAR images using ICA basis enhancement and separation

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Chinese Optics Letters 2007年第9期5卷 509-512页

作者：李昱彤周越 institute of Image Processing and pattern recognition Shanghai Jiao Tong University

An approach for synthetic aperture radar （SAR） image de-noising based on independent component analysis （ICA） basis images is proposed. Firstly, the basis images and the code matrix of the original image are obtained using ICA algorithm. Then, pointwise Hoder exponent of each basis is computed as a cost criterion for basis enhancement, and then the enhanced basis images are classified into two sets according to a separation rule which separates the clean basis from the original basis. After these key procedures for speckle reduction, the clean image is finally obtained by reconstruction on the clean basis and original code matrix. The reconstructed image shows better visual perception and image quality compared with those obtained by other traditional techniques.

关键词： Algorithms Image quality Independent component analysis Speckle Synthetic aperture radar