检索结果-内蒙古大学图书馆

Compatible texture image segmentation algorithm based on mean shift method

International Review on Computers and Software 2012年第4期7卷 1931-1937页

作者： Xiao, Weichu Guo, Baolong Chen, Weihong School of Communication and Electronic Engineering Hunan City University Yiyang 413002 Hunan China Institute of Intelligent Control and Image Engineering Xidian University Xi'an 710071 Shanxi China

Based on wavelet multi-resolution analysis and mean-shift Unsupervised texture segmentation method and the mean shift clustering based on wavelet feature completely unsupervised adaptive multi-scale segmentation and neither the need for training is not necessary to split the categorya priori knowledge of the number, etc. the method according to the strategy in scale between the transmission of information, adaptive to different regions of the image to determine the appropriate split of the scale, texture inner region using the coarse scale features at the junction between the different texture to use smaller scale features to ensure regional consistency to more accurately locate the image edge contrast experimental results show that the method has good performance in the synthetic textures and real texture image, multi-scale segmentation process is similar to human visual system, perception, and advantages compared to the traditional supervised segmentation method. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.

关键词： Wavelet transforms

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An improved single-image super-resolution algorithm through neighbor embedding and fusion of image patch

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International Review on Computers and Software 2012年第3期7卷 1308-1315页

作者： Xiao, Weichu Guo, Baolong School of Communication and Electronic Engineering Hunan City University Yiyang 413002 Hunan China Institute of Intelligent Control and Image Engineering Xidian University Xi'an 710071 Shanxi China

Neighbor embedding algorithm has been widely used in single-image super-resolution (SR) reconstruction, which makes the assumption that neighbor patches embedded are contained in a single manifold. However, this is not true for SR because of "one-to-many" mappings between low-resolution (LR) and high-resolution (HR) patches. To overcome the problem, we believe that textures may be contained in multiple manifolds. Under this assumption, by considering that the middle-frequency information of LR images has greater correlation with high resolution image than low frequency. We propose an improved single-image super-resolution algorithm. First, the low-resolution test and train image is decomposed into its middle-frequency and low-frequency components by applying the Gaussian low-pass filter. Then, we use locally linear embedding (LLE) to estimate HR patches for middle-frequency and low-frequency components of the low-resolution test image, respectively. Finally, two HR patches are fused into one by using fusion rules and all HR patches are merged to obtain the final HR image. The experimental results show that the proposed method performs better in both quantitative and qualitative evaluation compare with several NE-related SR approaches and the bi-cubic interpolation. © 2012 Praise Worthy Prize S.r.l.

关键词： image fusion

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An Overview of Hierarchical Temporal Memory: A New Neocortex Algorithm

An Overview of Hierarchical Temporal Memory: A New Neocortex...

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2012 International Conference on Modelling,Identification and control(建模、辨别与控制国际会议 ICMIC 2012)

作者： Xi Chen Wei Wang Wei Li Institute of System engineering Huazhong University of Science & TechnologyImage Processing and Int Candidate for Master of theInstitute of System engineering Huazhong University of Science &Technolog Department of Control Science &Engineering Image Processing and Intelligent Control Key Laboratory o

ISBN: (纸本)9781467315241

The overview presents the development and application of Hierarchical Temporal Memory (HTM).HTM is a new machine learning method which was proposed by Jeff Hawkins in *** is a biologically inspired cognitive method based on the principle of how human brain *** method invites hierarchical structure and proposes a memory-prediction framework, thus making it able to predict what will happen in the near *** overview mainly introduces the developing process of HTM, as well as its principle, characteristics, advantages and applications in vision, image processing and robots movement, some potential applications by using HTM , such as thinking process, are also put forward.

关键词： hierarchical Bayesian network spatial-temporal memory-prediction temporal sequence pattern recognition

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An overview about pinning control of complex networks

An overview about pinning control of complex networks

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2012 International Conference on Modelling,Identification and control(建模、辨别与控制国际会议 ICMIC 2012)

作者： Xi Chen Lan Zhang Wei Li Institute of System engineering Huazhong University of Science & TechnologyImage Processing and Int Candidate for Master of Systemengineering Huazhong University of Science & TechnologyImageProcessin Department of Control Science &Engineering Image Processing and Intelligent Control Key Laboratory o

ISBN: (纸本)9781467315241

Synchronization and pinning control of complex networks is to regulate the agents' behavior and improve network *** this article, we review some recent developments in pinning *** algorithms and pining strategies in different types of complex networks are presented and *** pinning control is also *** addition, the research extended to discrete-time case is *** some related research, the development in consensus and flocking of multi-agent system are introduced *** last, we give some ideas about pinning control in social networks.

关键词： Complex network pinning control adaptive control multi-agent systems

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Analytical algorithm of program quaternion in the arbitrary spacecraft attitude-adjusting control

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Journal of Information and Computational Science 2012年第3期9卷 751-759页

作者： Ni, Shaobo Wu, Jianwu Liu, Lei Wang, Yongji Shan, Jiayuan Su, Mao School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China Beijing Aerospace Automatic Control Institute Beijing 100854 China Key Laboratory of Education Ministry for Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

The analytical algorithm of program quaternion is studied, aiming at the problem of the arbitrary space vehicle attitude-adjusting control. The analytical constructor method of the program quaternion is provided for arbitrary given initial quaternion, initial angle velocity, terminal quaternion and terminal angle velocity. The presented method has advantages as: good adaptability, the initial and terminal conditions are both arbitrary;reduced operation, the calculation process involves the fundamental algebraic operation;direct optimization, the time consumption in the process of space vehicle attitude adjustment and the maximum angular velocity can be optimized directly by using the program quaternion model. Finally, according to the simulation results, the program quaternion tracking can be realized by a PD control law. © 2012 Binary Information Press.

关键词： Attitude control

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Ultra-high resolution phase difference measurement method

Ultra-high resolution phase difference measurement method

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IEEE International Frequency control Symposium

作者： Shaofeng Dong Wei Zhou Baoqiang Du Changzhe Jiao Department of Measurement and Instrument Xidian University Xi'an China College of Electric and Information Engineering Zhengzhou University of Light Industry Zhengzhou China Institute of Intelligent Control & Image Engineering Xidian University Xi'an China

ISBN: (纸本)9781457718212

This paper reveals the quantized phase step phenomenon between every two cyclical signals and its characteristics. With these characteristics, ultra-high resolution phase difference measurement limited by the quantized phase step and its corresponding measurements can be achieved. The princple that the quantized phase steps between two radio frequencies are usually less than picosecond, femtosecond and even sub-femtoseconds, namely, the princple that the corresponding equivalent phase comparison frequency between two radio frequencies can enter into the microwave or light bands is also revealed, which provides a foundation for the precise link based on phase group processing between frequencies in different bands. In this paper, an ultra-high resolution phase difference measurement method based on the quantized phase step phenomenon and the phase coincidence detection is proposed. By introducing an intermediate frequency, this method utilizes the quantized phase step phenomenon between the measured frequency and the intermediate frequency to measure the phase difference. Highspeed A/D sampling and data processing are used to improve the phase coincidence detection accuracy.

关键词： Frequency measurement Phase measurement Signal resolution Frequency synthesizers Logic gates Time measurement Data processing

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Real time performance improvement of electrical resistance tomography

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ICIC Express Letters, Part B: Applications 2012年第4期3卷 769-776页

作者： Wang, Pai Guo, Baolong Li, Nan Institute of Intelligent Control Image Engineering Xidian University No. 2 South Taibai Rd. Xi'an 710071 China Department of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology No. 100 Pingleyuan Chaoyang Dist. Beijing 10022 China

This paper puts forward a novel design for a high-speed residual potential discharge circuit that improves real time performance of an electrical resistance tomography (ERT) system. The authors' analysis of transient time effects at the electrode-electrolyte surface of a model ERT sensor used with bi-directional current pulse excitation found that a large amount of accumulated charge is produced between the excitation electrodes due to electrode polarization. This part of the residual potential is bound to produce a huge measuring noise and its attenuation speed greatly affects real time performance of the ERT system. Therefore, a novel high-speed discharge circuit is designed to eliminate measuring noise generated by the residual potential. Two simulation tests are conducted on the denoising effect of the new circuit and the results show that the circuit can effectively eliminate residual potential between excitation electrodes. The high speed discharging circuit is also used in an ERT system developed by the authors (using bi-directional current pulse excitation) for an off-line experiment case, where the system achieved a speed of 3877 frames per second. The result shows that this technology can be applied to significantly improve real-time ERT system performance. © 2012 ICIC International.

关键词： Electrodes

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Multiple index optimization method based on orthogonal design and fuzzy analysis for electrical resistance tomography sensor design

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ICIC Express Letters 2012年第9期6卷 2301-2307页

作者： Wang, Pai Guo, Baolong Li, Nan The Institute of Intelligent Control Image Engineering Xidian University P.O. Box 284 No. 2 Taibai Road Xi'an 710071 China College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology No. 100 Pingleyuan Chaoyang District Beijing 100124 China

A multiple index optimization method for ERT sensors is put forward which combines an orthogonal design and fuzzy analysis. This method first establishes a scientific and proper fuzzy evaluation method using fuzzy mathematics to define ERT index satisfaction (ERTIS) and overall ERT index satisfaction (OERTIS) and to construct their satisfaction functions. It unifies all of ERT sensor indices into a single comparable satisfaction value. Then, the OERTIS analysis is developed which allows a set of multiple index orthogonal experiments to be transferred into a single index orthogonal experiment, where, the uniformity index and the correlation coefficient index of the ERT sensor are set as the optimization objectives. The experiments are set up based on multi-index orthogonal design. The experimental results indicate that the method can derive an evenly distributed sensitivity field and a better image with the optimized sensors, and improve the OERTIS of the ERT sensors by 13.75%. © 2012 ICIC International.

关键词： Functions

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The analytical algorithm of program quaternion in the arbitrary spacecraft attitude-adjusting control

The analytical algorithm of program quaternion in the arbitr...

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2011 3rd International Asia Conference on Informatics in control, Automation and Robotics, CAR 2011

作者： Ni, Shaobo Wu, Jianwu Shan, Jiayuan Liu, Lei Su, Mao School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China Beijing Aerospace Automatic Control Institute Beijing 100854 China Key Laboratory of Education Ministry for Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783642259913

The analytical algorithm of program quaternion is studied, aiming at the problem of the arbitrary spacecraft attitude-adjusting control. It also provides the analytical constructor method of the program quaternion for any given initial quaternion and angle velocity, terminal quaternion and angle velocity. The advantages of this method are as follows: (1) Good adaptability. Both of the initial and terminal conditions are arbitrary;(2) Simple model. The calculation process only involves the simple algebraic operation;(3) Easy to optimize. By using the program quaternion model, the time consumption in the process of spacecraft attitude adjustment and the maximum angular velocity can be optimized directly. According to the Mathematical simulation results, the program quaternion tracking can be realized by a simple PD control law. © 2011 Springer-Verlag.

关键词： Attitude control

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Predictive control of vehicle based on Echo state network

Predictive control of vehicle based on Echo state network

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International Conference on Intelligence Science and Information engineering

作者： Ni, Shaobo Liu, Lei Wang, Zhishen Wang, Zirui Beijing Institute of Technology School of Aerospace Engineering Beijing 100081 China Beijing Aerospace Automatic Control Institute Beijing 100854 China Department of Control Science and Engineering Key Laboratory of Education Ministry for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769544809

An Echo State Network (ESN) based predictive control method for aircraft system is proposed to increase the flight quality. Aerocraft is a nonlinear and time-varying system and its controllers are usually designed by trajectory linearization method. Furthermore, the predictive controller is designed to adjust the current controlled variables by the trend of output to improve the quick responsiveness and traceability. Then, the stability of the system is proved by Lyapunov function. Finally, the numerical simulation results of step-response and attitude tracking illustrate the robustness and effect of the method. © 2011 IEEE.

关键词： controllers

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