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24th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2010

作者： Jurgelionis, A. Bellotti, F. De Gloria, A. Laulajainen, J.-P. Fechteler, P. Eisert, P. David, H. Department of Biophysical and Electronic Engineering University of Genoa Genoa Italy Converging Networks Laboratory VTT Technical Research Centre of Finland Oulu Finland Computer Vision and Graphics Image Processing Department Heinrich-Hertz-Institute Fraunhofer-Institute for Telecommunications Berlin Germany R and D Department Exent Technologies Ltd. Petach Tikva Israel

ISBN: (纸本)9780769540191

In this paper we present a new cross-platform approach for video game delivery in wired and wireless local networks. The developed 3D streaming and video streaming approaches enable users to access video games on set top boxes and handheld devices that natively are not capable to run PC games. During the development of the distributed gaming system we have faced a number of challenges and problems posed by the hardware and network limitations. In order to solve these problems we have developed a multilevel testing methodology which is based on user assessment and technical measures for the system under development. In this paper we focus on the technical measures and instrumentation that we use for the system's performance measurement and testing. The benefits of our testing methodology are demonstrated through examples from the development and testing work. © 2010 IEEE.

关键词： Human computer interaction

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Rolling bearing fault diagnosis fusion model based on gene expression programming

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Journal of Information and Computational Science 2010年第12期7卷 2437-2442页

作者： Huang, Jiangtao Wang, Minghui Xu, Kaikuo Institute of Image and Graphics Sichuan University Chengdu 610064 China School of Computer Science Sichuan University Chengdu 610064 China College of Computer Science and Technology Chengdu University of Information Technology Chengdu 610225 China

Traditionally, a single sensor is always used to provide several machine components operating condition for fault diagnosis. Fault diagnosis based on this approach is difficult to obtain satisfactory results, especially in the severe operating environment. This paper proposes a new feature-level fusion model based on gene expression programming. And the new fusion model fuses machine component operating features from more than one sensor in parallel. Firstly, calculate time-domain feature parameters of each sensor signal. Secondly, construct multi-sensor feature-level fusion model by using gene expression programming. Finally, identify the integration information and make decisions for machine components fault diagnosis. Experiments show that the new approach can achieve better performance than single sensor approach, and it is able to further improve the accuracy of fault diagnosis. © 2010 Binary Information Press.

关键词： Failure analysis

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Fast Texture Segmentation Based on Semi-local Region Descriptor and Active Contour Driven by the Bhattacharyya Distance

Fast Texture Segmentation Based on Semi-local Region Descrip...

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International Conference on Multimedia Information Networking and Security (MINES)

作者： Shanqing Zhang Weibin Xin Guixu Zhang Institute of Graphics and Image Hangzhou Dianzi University Hangzhou China Department of Computer Science and Technology East China Jiao Tong University Shanghai China

Based on a texture descriptor which intrinsically defines the geometry of textures using semi-local image information and tools from differential geometry, a fast active contour segmentation model for color texture image is proposed. In this model, we use the popular Bhattacharyya distance between the probability density function (pdf) to design the data fitting term which distinguishes the background and textures of interest. Then, a fast algorithm based on the Split-Bregman method is introduced to extract meaningful objects. Finally, some examples on some challenging images are illustrated to verify the possibility of the proposed model.

关键词： image segmentation Active contours Numerical models Probability density function image color analysis Minimization Tensile stress

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The convergence analysis for the rational Bézier curves

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Journal of Information and Computational Science 2010年第8期7卷 1643-1648页

作者： Shi, Mao Ye, Zhenglin Wang, Guozhao Kang, Baosheng Department of Applied Mathematics Northwestern Polytechnical University Xi'an 710072 China Institute of Computer Graphics and Image Processing Department of Mathematics Zhejiang University Hangzhou 310027 China Department of Computer Northwest University Xi'an 710069 China

This article considers the limit of a rational Bézier curve. Limits are considered using point-wise, uniform and L1 limits to a family of rational Bézier curves. The paper shows that a rational Bézier curve dose not uniformly converge on [0, 1] to its point-wise limit, when one of the weight goes to infinity. The goal of this paper is to clarify the ambiguity between the viewpoint of Goldman [1] and Piegl [2] on the limit of a rational Bézier curve. For that, we detail the limit in term of the different criteria. Copyright © 2010 Binary Information Press.

关键词： L1 convergence Non-uniform convergence Point-wise convergence Rational Bézier curve

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Evaluating the similarity degree of digital watermarks

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Journal of Information and Computational Science 2010年第6期7卷 1417-1422页

作者： Li, Li Ruan, Liuzhao Zhang, David Institute of Computer Graphics and Image Processing Hangzhou Dianzi University Hangzhou 310018 China Centre for Multimedia Signal Processing Biometrics Research Centre Hong Kong Polytechnic University Hong Kong

The popular formulas currently used to evaluate the similarity of digital watermarks have serious drawbacks: when the similarity degree is 1, the watermarks are not unique. This paper firstly analyze the drawbacks in the popular formulas. Then proposes a new formula similarity degree, which eliminates the shortcomings of the existing formulas and overcome the lack of uniqueness in theory. From the experiment results the new formula not only does well in evaluating the watermark's similarity degree, also is in good accordance with visual perception. © 2010 Binary Information Press.

关键词： Digital watermarking

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An Omnidirectional Time-of-Flight Camera and its Application to Indoor SLAM

An Omnidirectional Time-of-Flight Camera and its Application...

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International Conference on Control, Automation, Robotics and Vision

作者： Katrin Pirker Matthias Ruther Horst Bischof Gerald Schweighofer Heinz Mayer Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16/II 8010 Graz Austria Institute of Digital Image Processing Joanneum Research GmbH Wastiangasse 6 8010 Graz Austria

ISBN: (纸本)9781424478149

Photonic mixer devices (PMDs) are able to create reliable depth maps of indoor environments. Yet, their application in mobile robotics, especially in simultaneous localization and mapping (SLAM) applications, is hampered by the limited field of view. Enhancing the field of view by optical devices is not trivial, because the active light source and the sensor rays need to be redirected in a defined manner. In this work we propose an omnidirectional PMD sensor which is well suited for indoor SLAM and easy to calibrate. Using a single sensor and multiple planar mirrors, we are able to reliably navigate in indoor environments to create geometrically consistent maps, even on optically difficult surfaces.

关键词： field of view supersonic low altitude missile indoor environment Optical Devices simultaneous localization and mapping TIME OF FLIGHT Sensors

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Extraction of Human Body Skeleton Based on Silhouette images

Extraction of Human Body Skeleton Based on Silhouette Images

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International Workshop on Education Technology and computer Science, ETCS

作者： Jianhao Ding Yigang Wang Lingyun Yu State Key Laboratory of CAD & CG University of Zhejiang Hangzhou China Institute of Computer graphics and Image Processing Hangzhou Dianzi University Hangzhou China Department of Mathematics and Computing Science University of Groningam Netherlands

ISBN: (纸本)9781424463886;9780769539874

Skeleton extraction is essential for general shape representation. A typical skeletonization algorithm should obtain the ability to preserve original object's topological and hierarchical properties. However, most of current methods are high memory cost, computationally intensive, and also require complex data structures. In this paper, we propose an efficient and accurate skeletonization method for the skeleton feature points extracted from human body based on silhouette images. First, the gradient of distance transform is used to detect critical points inside the foreground. Then, we converge and simplify critical points in order to generate the most important and elegant skeleton feature points. Finally, we present an algorithm which connects the skeleton feature points and estimates the position of skeleton joints.

关键词： Humans Skeleton Joints Iterative algorithms Euclidean distance Data mining Motion analysis image converters Shape Feature extraction

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Adaptive feature selection and extraction approaches for image retrieval based on region

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Journal of Multimedia 2010年第1期5卷 85-92页

作者： Song, Haiyu Li, Xiongfei Wang, Pengjie Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun China Institute of Computer Graphics and Image Processing Dalian Nationalities University Dalian China State Key Laboratory of CAD and CG Zhejiang University Hangzhou China

image retrieval based on region is one of the most promising and active research directions in recent year's CBIR, while region segmentation, feature selection and feature extraction of region are key issues. However, the existing approaches always adopt a uniform approach of segmentation and feature extraction for all images in the same system. In this paper, we propose adaptive image segmentation and feature extraction approach according to different category image for image retrieval system. To improve performance, we propose adaptive segmentation approach according to different category image. Textured image is segmented by Gaussian Mixture Models (GMM), while non-textured image is segmented by our proposed block-based normalized cut. To accurately describe feature of region, we propose weight assignment method for centroid pixel and its neighbor by convolution with normal distribution when image segmentation by GMM. To improve generalization, we propose adaptive number of Fourier descriptors of shape signature which depends on the energy distribution of Fourier descriptors, instead of fixed number by experience. To simply and efficiently describe the spatial relationships of multi-object or multi-region in same image, we apply simplified topological relationships. The experiments demonstrate that proposed approaches are superior to the traditional approaches. © 2010 ACADEMY PUBLISHER.

关键词： Feature extraction

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Optimal constrained multi-degree reduction of Bézier curves with explicit expressions based on divide and conquer

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 577-582页

作者： Lian ZHOU Guo-jin WANG Institute of Computer Graphics and Image Processing State Key Lab of CAD & CG Zhejiang University Hangzhou 310027 China

We decompose the problem of the optimal multi-degree reduction of Bézier curves with corners constraint into two simpler subproblems, namely making high order interpolations at the two endpoints without degree reduction, and doing optimal degree reduction without making high order interpolations at the two endpoints. Further, we convert the second subproblem into multi-degree reduction of Jacobi polynomials. Then, we can easily derive the optimal solution using orthonormality of Jacobi polynomials and the least square method of unequally accurate measurement. This method of 'divide and conquer' has several advantages including maintaining high continuity at the two endpoints of the curve, doing multi-degree reduction only once, using explicit approximation expressions, estimating error in advance, low time cost, and high precision. More importantly, it is not only deduced simply and directly, but also can be easily extended to the degree reduction of surfaces. Finally, we present two examples to demonstrate the effectiveness of our algorithm.

关键词： Bezier curves Multi-degree reduction Divide and conquer

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Live Cell Segmentation in Fluorescence Microscopy via Graph Cut

Live Cell Segmentation in Fluorescence Microscopy via Graph ...

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International Conference on Pattern Recognition

作者： Milán Leskó Zoltan Kato Antal Nagy Imre Gombos Zsolt Török Laszlo Vigh Jr László Vígh Department of Image Processing and Computer Graphics University of Szeged Szeged Hungary Molecular Stress Biology Group Institute of Biochemistry Biological Research Center Hungarian Academy of Sciences (ATOMKI) Hungary Molecular Stress Biology Group Biological Research Center

We propose a novel Markovian segmentation model which takes into account edge information. By construction, the model uses only pairwise interactions and its energy is sub modular. Thus the exact energy minima is obtained via a max-flow/min-cut algorithm. The method has been quantitatively evaluated on synthetic images as well as on fluorescence microscopic images of live cells.

关键词： image segmentation Microscopy Pixel Computational modeling Mathematical model Biomembranes Biology

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