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IEEE International Conference on Cyber Technology in Automation,Control,and Intelligent Systems

作者： Liang, Xinwu Huang, Xinhan Wang, Min Key Laboratory of Image Processing and Intelligent Control Dept. of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

ISBN: (纸本)9781612849102

So far, all of the approximate Jacobian controllers for robot manipulators proposed in the literatures have assumed that the exact joint velocity measurements are available. In this paper, we propose alternative controller designs without the use of joint velocity measurements. To provide the joint velocities used by the controllers, we introduce the well-known sliding mode observers to estimate the robot manipulator states. In addition, Lyapunov analysis is presented to show that the combined controller-observer designs can achieve asymptotical stability in the sliding patch. Simulation results are also presented to show the performance of the proposed methods. © 2011 IEEE.

关键词： Velocity measurement

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A novel estimation strategy for the eye-in-hand dept.-independent visual servoing

A novel estimation strategy for the eye-in-hand depth-indepe...

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2011 International Conference on Consumer Electronics, Communications and Networks, CECNet 2011

作者： Liang, Xinwu Huang, Xinhan Wang, Min Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Dept. of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

ISBN: (纸本)9781612844572

As we know, a novel adaptive visual servoing strategy has been proposed for the control of robot manipulators with an eye-in-hand configuration, where an adaptive law is used to estimate the unknown parameters determined by the products of the unknown 3D coordinates and the unknown camera parameters. From a practical point of view, in this paper, we propose a novel strategy for the estimation of these two types of unknown parameters. The new strategy is very useful in that it can reduce the number of the unknown parameters to be estimated. To demonstrate the feasibility of the proposed method, preliminary simulation results based on a two-link planar robot manipulator are presented in this paper. © 2011 IEEE.

关键词： Parameter estimation

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Digital image analysis in breast cancer: An example of an automated methodology and the effects of image compression

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Studies in Health Technology and Informatics 2012年 179卷 155-171页

作者： López, Carlos Lejeune, Marylène Bosch, Ramon Korzynska, Anna García-Rojo, Marcial Salvadó, Maria-Teresa Álvaro, Tomás Callau, Cristina Roso, Albert Jaén, Joaquín Unitat de Suport A la Recerca de la Gerencia Territorial Terres de L'Ebre Hospital de Tortosa Verge de la Cinta C/ Esplanetes n 14 43500-Tortosa Spain Molecular Biology and Research Section Hospital de Tortosa Verge de la Cinta IISPV URV Tortosa Spain Dept. of Pathology Hospital de Tortosa Verge de la Cinta IISPV Tortosa Spain Laboratory of Processing Systems of Microscopic Image Information Nalecz Institute of Biocybernetics and Biomedical Engineering Polish Academy of Sciences Warsaw Poland Department of Pathology Hospital General Universitario de Ciudad Real Ciudad Real Spain

In the current practice of pathology, the evaluation of immunohistochemical (IHC) markers represents an essential tool. The manual quantification of these markers is still laborious and subjective, and the use of computerized systems for digital image (DI) analysis has not yet resolved the problems of nuclear aggregates (clusters). Furthermore, the volume of DI storage continues to be an important problem in computer-assisted pathology. In the present study we have developed an automated procedure to quantify IHC nuclear markers in DI with a high level of clusters. Furthermore the effects of JPEG compression in the image analysis were evaluated. The results indicated that there was an agreement with the results of both methods (automated vs. manual) in almost 90% of the analyzed images. On the other hand, automated count differences increase as the compression level increase, but only in images with a high number of stained nuclei (>nuclei/image) or with high area cluster (>25μm2). Some corrector factors were developed in order to correct this count differences. In conclusion, the proposed automated procedure is an objective, faster than manual counting and reproducible method that has more than 90% of similarity with manual count. Moreover, the results demonstrate that with correction factors, it is possible to carry out unbiased automated quantifications on IHC nuclear markers in compressed DIs.. © 2012 The authors and IOS Press. All rights reserved.

关键词： Pathology

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Extension of Non-Local Means (NLM) algorithm with Gaussian filtering for highly noisy images

Extension of Non-Local Means (NLM) algorithm with Gaussian f...

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2011 IEEE Visual Communications and image processing, VCIP 2011

作者： Chachada, Sachin Oh, Byung Tae Cho, Namgook Phong, San A. Manchala, Daniel Kuo, C.-C.Jay Signal and Image Processing Institute Ming Hsieh Dept. of Electrical Engineering University of Southern California Los Angeles CA 90089-2564 United States Xerox Corporation 701 S. Aviation Blvd. El Segundo CA 90245 United States

ISBN: (纸本)9781457713200

The denoising performance of the Non-Local Means (NLM) method decreases as the variance of additive white Gaussian noise becomes higher. In this paper, we explain this phenomenon and propose a modified version of the Non-Local Means (NLM) method, called the Enhanced-Weights NLM (EWNLM) algorithm, to denoise highly noisy images. The EWNLM algorithm evaluates weights from a pre-filtered image using the Gaussian kernel, which in turn result in more robust weight contributions from similar pixels in the search window. Experimental results are given to demonstrate the superior performance of the EWNLM scheme when the standard deviation of the additive white Gaussian noise (AWGN) is greater than 20. © 2011 IEEE.

关键词： image denoising

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Guest Editorial: Vehicular communications and networks - Part I

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IEEE Journal on Selected Areas in Communications 2011年第1期29卷 1-6页

作者： Wang, Cheng-Xiang Vasilakos, Athanasios V. Murch, Ross D. Stüber, Gordon Shen, Xuemin Sherman Chen, Wai Kosch, Timo Joint Research Institute for Signal and Image Processing School of Engineering and Physical Sciences Heriot-Watt University Edinburgh EH14 4AS United Kingdom Dept. of Computer and Telecommunications Engineering University of Western Macedonia Kozani 50100 Greece Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Department of Electrical and Computer Engineering University of Waterloo Waterloo ON N2L 3G1 Canada Applied Research Telcordia Technologies Inc. Piscataway NJ 07054 United States BMW Group Research and Technology Hanauer Strasse 46 D-80992 Munich Germany

Part I of this special issue is devoted to the physical layer, MAC layer, and physical-link cross-layer design technologies of vehicular communications and networks. There are 21 papers in this issue.

关键词： Communication Research iodine VEHICULAR COMMUNICATIONS

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Local Probability Distribution of Natural Signals in Sparse Domains

Local Probability Distribution of Natural Signals in Sparse ...

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IEEE International Conference on Acoustics, Speech and Signal processing

作者： Hossein Rabbani Saeed Gazor Biomed. Eng. Dept. and Medical Image and Signal Processing Research Center Isfahan University of Medical Sciences Isfahan Iran Department of Electrical and Computer Engineering Queen's University Kingston ON K7L 3N6 Canada

ISBN: (纸本)9781457705380

In this paper we investigate the local probability density function (pdf) of natural signals in sparse domains. The statistical properties of natural signals are characterized more accurately in the sparse domains because the sparse domain coefficients (SDCs) have heavy-tailed distribution and have reduced correlation with adjacent coefficients. Our experiments show that a conditionally (given locally estimated variance and shape) independent Bessel K-form (BKF) pdf locally fits the sparse domain's coefficients of natural signals, accurately. To justify this observation, we also investigate the pdf of the locally estimated variance and suggest a Gamma pdf for the locally estimated variance. Since commonly used sparse transformations are orthonormal, the pdf of the sparse domain coefficients must converge to Gaussian distribution by virtue of central limit theorem assuming that natural signals are locally wide sense stationary for small window sizes. Interestingly, we observe that the pdf of the normalized data (on the locally estimated variance) exhibit a Gaussian pdf, which justifies why the BKF pdf is an appropriate fit.

关键词： Modeling of natural signals Bessel K-form density Sparse transforms

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Reduced complexity schemes to greedy power allocation for multicarrier systems

Reduced complexity schemes to greedy power allocation for mu...

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作者： Al-Hanafy, Waleed Weiss, Stephan Dept. of EEE Centre for Excellence in Signal and Image Processing Univ. of Strathclyde Glasgow United Kingdom Electronics and Communications Engineering Dept. Faculty of Electronic Engineering Menoufia Univ. Menouf Egypt

ISBN: (纸本)9781424459148

Discrete bit loading for multicarrier systems based on the greedy power allocation (GPA) algorithm is considered in this paper. A new suboptimal scheme that independently performs GPA on groups of subcarriers and therefore can significantly reduce complexity compared to the standard GPA is proposed. These groups are formed in an initial step of a uniform power allocation (UPA) algorithm. In order to more efficiently allocate the available transmit power, two power re-distribution algorithms are further introduced by including a transfer of residual power between groups. Simulation results show that the two proposed algorithms can achieve near optimal performance in two separate and distinctive SNR regions. We demonstrate by analysis how these methods can greatly simplify the computational complexity of the GPA algorithm.

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Improved in vivo fluorescence tomography and quantitation in small animals using a novel multiview, multispectral imaging system

Improved in vivo fluorescence tomography and quantitation in...

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Biomedical Optics, BIOMED 2010

作者： Gardner, Craig Dutta, Joyita Mitchell, Gregory S. Ahn, Sangtae Li, Changqing Harvey, Peter Gershman, Russel Sheedy, Stephen Mansfield, James R. Cherry, Simon R. Leahy, Richard M. Levenson, Richard M. Cambridge Research and Instrumentation Inc. Woburn MA United States Signal and Image Processing Institute Dept. of Electrical Engineering-Systems USC Los Angeles CA United States Dept. of Biomedical Engineering UC-Davis Davis CA United States

We report on the design and initial experimental results of a multiview, multispectral preclinical fluorescence tomography instrument, designed to improve quantitation of fluorescence molecular imaging in disease rese... 详细信息

ISBN: (纸本)9781557528872

关键词： Molecular imaging

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Experimental protocol for accessibility evaluation

Experimental protocol for accessibility evaluation

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作者： Lima, Ana C.O. De Fátima Q. Vieira, Maria Aguiar, Yuska P.C. LIHM Electric Engineering Department Federal University of Campina Grande - UFCG Campina Grande Paraiba Brazil Center for Excellence in Signal and Image Processing Dept. of Electronic and Electrical Engineering University of Strathclyde United Kingdom

ISBN: (纸本)9789728939182

This paper presents an experimental protocol for the assessment of devices and systems' accessibility to be used by people with visual impairments. This protocol was adapted from an experimental protocol originally conceived for usability evaluation of products and systems at the Laboratory of Human-Machine Interfaces (LIHM) at the Federal University of Campina Grande (UFCG), in Brazil. The adoption of a systematic approach when performing the accessibility evaluation gives the evaluation results a more reliable basis for claims as well as enabling to replicate the experiments performed. The paper presents the protocol and discusses how to employ it in the evaluation of a set of resources conceived to promote accessibility for people with visual impairments.

关键词： Ergonomics

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OBJECT REIDENTIFICATION IN REAL WORLD SCENARIOS ACROSS MULTIPLE NON-OVERLAPPING CAMERAS

OBJECT REIDENTIFICATION IN REAL WORLD SCENARIOS ACROSS MULTI...

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European Signal processing Conference

作者： Guy Berdugo Omri Soceanu Yair Moshe Dmitry Rudoy Itsik Dvir Signal and Image Processing Laboratory (SIPL) Dept. of Electrical Engineering Technion - Israel Institute of Technology

In a world where surveillance cameras are at every street corner, there is a growing need for synergy among cameras as well as the automation of the data analysis process. This paper deals with the problem of reidentification of objects in a set of multiple cameras inputs without any prior knowledge of the cameras distribution or coverage. The proposed approach is robust to change of scale, lighting conditions, noise and viewpoints among cameras, as well as object rotation and unpredictable trajectories. Both novel and traditional features are extracted from the object. Light and noise invariance is achieved using textural features such as oriented gradients, color ratio and color saliency. A probabilistic framework is used incorporating the different features into a human probabilistic model. Experimental results show that textural features improve the reidentification rate and the robustness of the recognition process compared with other state-of-the-art algorithms.

关键词： image color analysis Cameras Feature extraction Color Robustness Lighting Trajectory

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