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Statistic Learning-based Defect Detection for Twill Fabrics

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International Journal of automation and computing 2010年第1期7卷 86-94页

作者： Li-Wei Han De Xu laboratory of complex {2. and intelligence science, institute of automation, chinese academy of sciences, beijing 100190, PRC laboratory of complex {2. and intelligence science Institute of Automation Chinese Academy of Sciences Beijing PRC

Template matching methods have been widely utilized to detect fabric defects in textile quality control. In this paper, a novel approach is proposed to design a flexible classifier for distinguishing flaws from twill fabrics by statistically learning from the normal fabric texture. Statistical information of natural and normal texture of the fabric can be extracted via collecting and analyzing the gray image. On the basis of this, both judging threshold and template are acquired and updated adaptively in real-time according to the real textures of fabric, which promises more flexibility and universality. The algorithms are experimented with images of fault free and faulty textile samples.

关键词： Image processing fabric flaw detection template matching adaptive template threshold self-learning

Recent progress in fingerprint recognition

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Progress in Natural science:Materials International 2006年第3期16卷 231-240页

作者： TIAN Jie, CHEN Xinjian, ZHANG Yangyang, YANG Xin, HE Yuliang, LI Liang, XIE Weihua and ZHENG Zhipeng (Center for Biometrics and Security Research, Key laboratory of complex {2. and intelligence science, institute of automation, chinese academy of sciences, beijing 100080, china Graduate School of the chinese academy of sciences, beijing 100080, china) [a]Center for Biometrics and Security Research Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China [b]Graduate School of the chinese academy of sciences Beijing China

Fingerprint recognition has been increasingly used to realize personal identification in civilian' s daily life, such as ID card, fingerprints hard disk and so on. Great improvement has been achieved in the on-line fingerprint sensing technology and automatic fingerprint recognition algorithms. Various fingerprint recognition techniques, including fingerprint acquisition, classification, enhancement and matching, are highly improved. This paper overviews recent advances in fingerprint recognition and summarizes the algorithm proposed for every step with special focuses on the enhancement of low-quality fingerprints and the matching of the distorted fingerprint images. Both issues are believed to be significant and challenging tasks. In addition, we also discuss the common evaluation for the fingerprint recognition algorithm of the Fingerprint Verification Competition 2.04 (FVC2.04) and the Fingerprint Vendor Technology Evaluation 2.03 (FpVTE2.03), based on which we could measure the performance of the recognition algorithm objectively and uniformly.

关键词： biometrics fingerprint enhancement matching minutia image registration similarity measures.

A fingerprint identification algorithm by clustering similarity

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science china(Information {2.) 2005年第4期48卷 437-451页

作者： TIAN Jie, HE Yuliang, CHEN Hong & YANG Xin Center for Biometric Research and Testing (CBRT), Key laboratory of complex {2. and intelligence science, institute of automation, chinese academy of sciences, Graduate School of the chinese Acad- emy of sciences, beijing 100080, china 1. Center for Biometric Research and Testing (CBRT) Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences 100080 Beijing China

This paper introduces a fingerprint identification algorithm by clustering similarity with the view to overcome the dilemmas encountered in fingerprint identification. To decrease multi-spectrum noises in a fingerprint, we first use a dyadic scale space (DSS) method for image enhancement. The second step describes the relative features among minutiae by building a minutia-simplex which contains a pair of minutiae and their local associated ridge information, with its transformation-variant and invariant relative features applied for comprehensive similarity measurement and for parameter estimation respectively. The clustering method is employed to estimate the transformation space. Finally, multi-resolution technique is used to find an optimal transformation model for getting the maximal mutual information between the input and the template features. The experimental results including the performance evaluation by the 2.d International Verification Competition in 2.02.(FVC2.02., over the four fingerprint databases of FVC2.02.indicate that our method is promising in an automatic fingerprint identification system (AFIS).

关键词： dyadic scale space (DSS) minutia-simplex multi-resolution comprehensive similarity.

A note on noncommutative moment problems

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science china Mathematics 2005年第8期48卷 1144-1151页

作者： MA Xiujuan School of sciences, Hebei University of Technology, Tianjin 300130, china Mathematics {2., academy of Mathematics and systems science, chinese academy of sciences, beijing 100080, china 1. School of sciences Hebei University of Technology 300130 Tianjin China 2. Mathematics institute Academy of Mathematics and Systems Science Chinese Academy of Sciences 100080 Beijing China

Noncommutative moment problems for C*-algebras are studied. We generalize a result of Hadwin on tracial states to nontracial case. Our results are applied to obtain simple solutions to moment problems on the square and the circle as well as extend the positive unital functionals from a (discrete) complex group algebra to states on the group C*-algebra.

关键词： moment, free product, state, group C*-algebra.

A new DNA algorithm to solve graph coloring problem

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Progress in Natural science:Materials International 2007年第6期17卷 733-738页

作者： Jiang Xingpeng1, Li Yin2. Meng Ya3 and Meng Dazhi2.1. National laboratory of Pattern Recognition,institute of {2., chinese academy of sciences, beijing 100080, china 2. College of Applied sciences, beijing University of Technology, beijing 10002., china 3. School of science, beijing institute of Technology, beijing 100081, china) National laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Beijing 100080 China College of Applied sciences Beijing University of Technology Beijing 100022 China School of science Beijing Institute of Technology Beijing 100081 China

Using a small quantity of DNA molecules and little experimental time to solve complex problems successfully is a goal of DNA computing. Some NP-hard problems have been solved by DNA computing with lower time complexity than conventional computing. However, this advantage often brings higher space complexity and needs a large number of DNA encoding molecules. One example is graph coloring problem. Current DNA algorithms need exponentially increasing DNA encoding strands with the growing of problem size. Here we propose a new DNA algorithm of graph coloring problem based on the proof of four-color theorem. This algorithm has good properties of needing a relatively small number of operations in polynomial time and needing a small number of DNA encoding molecules (we need only 6R DNA encoding molecules if the number of regions in a graph is R).

关键词： DNA computing NP-hard problem graph coloring problem.

ON complex DYNAMIC CONTROL systems

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Journal of systems science & {2.ity 2003年第3期16卷 350-357页

作者： CHENG Daizhan (institute of systems {2., chinese academy of sciences, beijing 100080, china) institute of systems {2. Chinese Academy of Sciences 北京 100080

This paper presents some recent works on the control of dynamic systems,which have certain complex properties caused by singularity of the nonlinear structures,structure^varyings, or evolution process etc. First, we consider the structure singularity of nonlinear control systems. It was revealed that the focus of researches on nonlinear control theory is shifting from regular systems to singular systems. The singularity of nonlinear systems causes certain complexity. Secondly, the switched systems are considered. For such systems the complexity is caused by the structure varying. We show that the switched systems have significant characteristics of complex systems. Finally, we investigate the evolution systems. The evolution structure makes complexity, and itself is a proper model for complex systems.

关键词： relative degree byrnes-isidori normal form center manifold switchedsystems evolution system

Design and implementation of an optical simulation environment for bioluminescent tomography studies

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Progress in Natural science:Materials International 2007年第1期17卷 87-94页

作者： LI Hui, TIAN Jie, LUO Jie, LU Yujie, CONG Wenxiang and WANG Ge ( Department of Education Technology, Capital Normal University, beijing 100037, china Key {2. of complex systems and intelligence science, institute of automation, chinese academy of sciences, beijing 100080, china Bioluminescent Tomography {2., Department of Radiology & Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa 52.42. USA) [a]Departhent of Education Technology Capital Normal University Beijing China [b]Key Laboratoiy of Omplex systems and intelligence {2. Institute of Automation Chinese Academy of Sciences Beijing China [c]Bioluminescent Tomography Laboratoiy Department of Radiology & Department of Biomedical Engineering University of Iowa Iowa City tIowa USA

As a challenging task for bioluminescent tomography simulation, a virtual optical environment is needed to solve the forward problem accurately, that is, to achieve a high precision for bioluminescent signal synthesis on the external body surface of a small animal. The molecular optical simulation environment named MOSE is implemented using the C++ programming language and the OpenGL techniques, including a user-friendly interface with interactive tools facilitating users' operations. The accuracy of the virtual optical environment is verified by error analysis of mesh simplification and comparison between MOSE results and experimental data. This virtual optical environment is accurate, flexible and efficient to simulate the photon propagation in complicated tissues, which has a great potential to become a software platform for bioluminescent tomography studies and other molecular imaging applications.

关键词： molecular imaging biolumlnescent tomography photon propagation Monte Carlo method.

ADAPTIVE systems THEORY: SOME BASIC CONCEPTS, METHODS AND RESULTS

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Journal of systems science & {2.ity 2003年第3期16卷 293-306页

作者： QUO Lei(institute of systems {2., academy of Mathematics and systems sciences, chinese academy of sciences, beijing 100080, china) institute of systems {2. Academy of Mathematics and Systems Sciences Chinese Academy of Sciences 北京 100080

The adaptive systems theory to be presented in this paper consists of two closely related parts: adaptive estimation (or filtering, prediction) and adaptive control of dynamical systems. Both adaptive estimation and control are nonlinear mappings of the on-line observed signals of dynamical systems, where the main features are the uncertain-ties in both the system's structure and external disturbances, and the non-stationarity and dependency of the system signals. Thus, a key difficulty in establishing a mathematical theory of adaptive systems lies in how to deal with complicated nonlinear stochastic dynamical systems which describe the adaptation processes. In this paper, we will illustrate some of the basic concepts, methods and results through some simple examples. The following fundamental questions will be discussed: How much information is needed for estimation? How to deal with uncertainty by adaptation? How to analyze an adaptive system? What are the convergence or tracking performances of adaptation? How to find the proper rate of adaptation in some sense? We will also explore the following more fundamental questions: How much uncertainty can be dealt with by adaptation ? What are the limitations of adaptation ? How does the performance of adaptation depend on the prior information ? We will partially answer these questions by finding some 'critical values' and establishing some 'Impossibility Theorems' for the capability of adaptation, for several basic classes of nonlinear dynamical control systems with either parametric or nonparametric uncertainties.

关键词： adaptive systems estimation control uncertainty stochastic systems stability

Holomorphic invariant forms of a bounded domain

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science china Mathematics 2008年第11期51卷 1945-1964页

作者： LU QiKeng institute of Mathematics, academy of Mathematics and {2. science, chinese academy of sciences, beijing 100190, china institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

Given a complete ortho-normal system ? = (?0,?1,?2.…) of L 2.H( $ \mathcal{D} $ ), the space of holomorphic and absolutely square integrable functions in the bounded domain $ \mathcal{D} $ of ? n , we construct a holomorphic imbedding $ \iota _\phi :\mathcal{D} \to \mathfrak{F}(n,\infty ) $ , the complex infinite dimensional Grassmann manifold of rank n. It is known that in $ \mathfrak{F}(n,\infty ) $ there are n closed (μ, μ)-forms τμ (μ = 1,…,n) which are invariant under the holomorphic isometric automorphism of $ \mathfrak{F}(n,\infty ) $ and generate algebraically all the harmonic differential forms of $ \mathfrak{F}(n,\infty ) $ . So we obtain in $ \mathcal{D} $ a set of (μ, μ)-forms ι ? * τμ (μ = 1,…, n), which are independent of the system ? chosen and are invariant under the bi-holomorphic transformations of $ \mathcal{D} $ . Especially the differential metric ds 2.1 associated to the K?hler form ι ? * τ1 is a K?hler metric which differs from the Bergman metric ds 2.of $ \mathcal{D} $ in general, but in case that the Bergman metric is an Einstein metric, ds 1 2.differs from ds 2.only by a positive constant factor.

关键词： complete ortho-normal system holomorphic invariant forms 32.36 32.65