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IEEE International Conference on Image Processing

作者： Y.Q. Wang W.F. Chen T.L. Yu Y.T. Zhang Tianjin Key Laboratory of Intelligent Computing & Novel Software Technology Tianjin University of Technology Tianjin China Key Laboratory of Image Processing Southern Medical University Guangzhou China Department of Radiology General Hospital Tianjin Medical University Tianjin China

Active contours have been one of the most successful methods for image segmentation during the last two decades, but one of the shortcomings of being unable to converge to concavity is a handicap to its effectiveness. In order to address this issue, the gradient vector flow (GVF) was put forth. Although there have been a great number of works on GVF, the image structure has seldom been incorporated into GVF algorithm. In this work, the image structure characterized by the Hessian matrix is incorporated into the GVF algorithm by reformulating the smoothness constraint of GVF into matrix form. In this way, the associated diffusion PDEs are anisotropic and the modified GVF snake can converge to very long concavity and preserve weak edge simultaneously. Experiments and comparisons are presented to demonstrate the properties of the proposed strategies.

关键词： Active contours Image edge detection Force Image segmentation Mathematical model Tensile stress Equations

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Design and implementation of a kind of EUPS for mobile service

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Journal of Information and Computational Science 2010年第11期7卷 2248-2257页

作者： Zhang, Xiaodan Zhang, Degan Qiao, Xiaodong Liang, Bing Peng, Hongtao Institute of Scientific and Technical Information of China Beijing 100038 China Tianjin Key Lab. of Intelligent Computing and Novel software Technology Tianjin University of Technology Tianjin 300191 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin 300191 China Beijing Petroleum Managers Training Institute Beijing 100096 China

In order to support mobile service of long-distance monitoring and controlling UPS based on Web, a kind of design and implementation solution of embedded UPS (EUPS) system is brought forward in this paper. The design and implementation of system is based on ATmega161 and RTL8019AS with TCP/IP protocol suite for communication. In the EUPS system, an embedded file system is designed and implemented which can store the data and index information on a serial EEPROM chip in structured way and communicate with MCU through I2C bus. By embedding the file system into UPS system or other information appliances, users can browse and manipulate local data on the web client side. Based on our experimental tests, the performance of EUPS can meet the requirements of Web-based mobile services. © 2010 Binary Information Press.

关键词： Websites

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Middleware Support for Context-awareness in Asynchronous Pervasive computing Environments

Middleware Support for Context-awareness in Asynchronous Per...

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IEEE/IFIP International Conference on Embedded and Ubiquitous computing, EUC

作者： Jianping Yu Yu Huang Jiannong Cao Xianping Tao Department of Computer Science and Technology Nanjing University Nanjing China State Key Laboratory for Novel Software Technology Nanjing University Nanjing China Internet and Mobile Computing Lab Department of Computing Hong Kong Polytechnic University Hong Kong China

Context-awareness is an essential feature of pervasive applications, and runtime detection of contextual properties is one of the primary approaches to enabling context awareness. However, existing context-aware middleware does not provide sufficient support for detection of contextual properties in asynchronous environments. We argue that in asynchronous environments, the concept of time needs to be reexamined. Instead of assuming the availability of global time or synchronous interaction, we should rely on logical time. To this end, we present the Middleware Infrastructure for Predicate detection in Asynchronous environments (MIPA), which supports context-awareness based on logical time. Design and operation of MIPA are explained in detail. We also evaluate MIPA with a comprehensive case study. The evaluation results show the cost-effectiveness and scalability of MIPA.

关键词： Context Radiofrequency identification Context modeling Middleware Memory management Pervasive computing

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Detecting and Tracking Moving Targets on Omnidirectional Vision

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Transactions of Tianjin University 2009年第1期15卷 13-18页

作者：杨淑莹葛为民张成何丕廉 School of Computer Science and Technology Tianjin University Tianjin Key Lab of Intelligent Computing and Novel Software Technology Tianjin University of Technology

A method was presented to implement the detecting and tracking of moving targets through omnidirec-tional vision. The method combined optical flow with particle filter arithmetic, in which optical flow field was used to detect and locate moving targets and particle filter was used to track the detected moving objects. According to the circular image character of omnidirectional vision, the calculation equation of optical flow field and the tracking arithmetic of particle filter were improved based on the polar coordinates at the omnidirectional center. The edge of a randomly moving object could be detected by optical flow field and was surrounded by a reference region in the particle filter. A dynamic motion model was established to predict particle state. Histograms were used as the fea-tures in the reference region and candidate regions. The mutual information (MI) and Gaussian function were com-bined to calculate particle weights. Finally, the state of tracked object was computed by the total particle states with weights. Experiment results show that the proposed method could detect and track moving objects with better real-time performance and accuracy.

关键词： omnidirectional vision optical flow particle filter mutual information

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NBGVF: Normally biased gradient vector flow external force for active contours

NBGVF: Normally biased gradient vector flow external force f...

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2009 International Conference on Information Engineering and Computer Science, ICIECS 2009

作者： Lu, Shaopei Wang, Yuanquan Tianjin Key Lab of Intelligent Computing and Novel Software Technology School of Computer Science Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9781424449941

Gradient vector flow (GVF) has been one effective external force for active contours, but it is based on isotropic diffusion. The recently proposed NGVF external force just took into account the diffusion along normal direction of the level line, so it is sensitive to noise and could smear the weak boundaries. In this article, we present a novel one called normally biased gradient vector flow (NBGVF) which keeps the diffusion along the tangential direction of the level line and biases that along the normal direction. The biasing weight of the diffusion along the normal direction approaches zero at boundaries and is 1, even larger, in homogeneous regions. Consequently, the NBGVF can preserve weak edges and smooth out noise while maintaining other desirable properties of GVF and NGVF such as enlarged capture range, insensitivity to initialization and convergence to u-shape concavity. These properties are evaluated on synthetic and real images. ©2009 IEEE.

关键词： Image segmentation

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Research on context-aware computing with uncertainty for proactive service

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International Journal of Modelling, Identification and Control 2009年第3期8卷 248-255页

作者： Zhang, De-Gan Tianjin Key Lab of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191 China Key Laboratory of Computer Vision and System Tianjin University of Technology Ministry of Education Tianjin 300191 China Key Lab of Industrial Controlling Technology Zhejiang University Hangzhou 310027 China

It is known to all that context-aware computing with uncertainty is an important part of pervasive computing for proactive service. Because multi-source evidence context-aware information with uncertainty is dynamic and changing randomly, in order to ensure the QoS of different application fields based on pervasive computing, we modified the fusion method of evidence information after considering context's reliability, time efficiency and relativity, which has improved the classic fusion rule of D-S evidence theory when used in the pervasive computing paradigm. After extending the process, we overcome the shortcoming of classic D-S evidence theory. All these suggested technologies have been successfully used in our project. The efficiency of our researches has been tested by application practice and validation of the demo. Copyright © 2009, Inderscience Publishers.

关键词： Ubiquitous computing

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Image structure adaptive gradient vector flow for active contours

Image structure adaptive gradient vector flow for active con...

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2009 International Conference on Information Engineering and Computer Science, ICIECS 2009

作者： Li, Kun Wang, Yuanquan Tianjin Key Lab. of Intelligent Computing and Novel Software Technology School of Computer Science Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9781424449941

The gradient vector flow (GVF) is an effective external force for active contours, but it's smoothness constraint doesn't take any image structure into account and the resulting diffusion equation is isotropic which would oversmooth weak edges. In this article, a novel external force named image structure adaptive gradient vector flow (ISAGVF) is proposed for active contours. The proposed ISAGVF employs certain smoothness constraint which is able to be adaptive to image structure, such that the ISAGVF snake would outperform the GVF snake in terms of noise robustness, weak edge preserving and narrow and deep concavity convergence, while possessing some other desirable properties such as enlarged capture range and insensitivity to initialization. Experiments on synthetic and real images manifest these properties of ISAGVF snake. ©2009 IEEE.

关键词： Tensors

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A wavelet-domain structure similarity for image quality assessment

A wavelet-domain structure similarity for image quality asse...

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2009 2nd International Congress on Image and Signal Processing, CISP'09

作者： Lixiong, Liu Yuanquan, Wang Yuwei, Wu Beijing Lab. of Intelligent Information Technology School of Computer Science Beijing Institute of Technology Beijing China Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin China

ISBN: (纸本)9781424441310

Recent studies have found that adoption of structure similarity index (SSIM) was successful in reflecting human visual characteristic better compared with traditional PSNR metrics. However this method shows some defects when evaluating the quality of blurred images and compressed degraded images at low bit rate. Good quality results were hardly achieved as they do not match the human vision system (HVS) well. This paper is to introduce a new image quality assessment algorithm based on wavelet-domain structure similarity (WDSSIM). The relative importance of the edge information under different scales is considered sufficiently in image quality assessment. The experimental results have demonstrated better consistency with the subjective perception for a large range of image types. ©2009 IEEE.

关键词： Image quality

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The earthquake probability prediction based on weighted factor coefficients of principal components

The earthquake probability prediction based on weighted fact...

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5th International Conference on Natural Computation, ICNC 2009

作者： Xueli, Wei Xiaofeng, Cui Chun, Jiang Xinbo, Zhou Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191 China Earthquake Administration of Tianjin Tianjin 300201 China

ISBN: (纸本)9780769537368

Considering there are many seismicity factors with information overlap, we apply a gray generating -A generating GM model which has higher precision to mine the potential law of these factors, and apply principal component analysis(PCA) approach to reduce the dimension of these factors, choose several seismicity factors which represent most of the information that the original seismicity factors carry, by utilizing Bayes posterior probability discriminant analysis, to predict the largest magnitude for certain region and period numerically and synthetically. As an example, we predicte the annual largest magnitude for North China(30°∼ 42°E, 108°∼125°N). The application results show the practical value of this model in the medium-short-term earthquake prediction. © 2009 IEEE.

关键词： Principal component analysis

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A unique multi-functional landmark for autonomous navigation

A unique multi-functional landmark for autonomous navigation

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5th International Conference on Natural Computation, ICNC 2009

作者： Wang, Dan Jia, Yunwei Cao, Zuoliang Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Ministry of Education China School of Mechanical Engineering Tianjin University of Technology China

ISBN: (纸本)9780769537368

To save time, improve flexibility and guarantee accuracy of the navigation system of the mobile robots, a multifunction landmark and a new navigation algorithm are proposed in this paper. With the new algorithm and landmark the mobile robots can be located by only a single landmark, and can be navigated in a large area by serial landmarks. The simple configuration and the convenient material of the landmark increased the system 's flexibility and decreased the complexity of the algorithm. From the experimental results it can be concluded that the navigation system has fast navigation speed and high navigation accuracy. © 2009 IEEE.

关键词： Navigation systems

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