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On global synchronization of chaotic systems

On global synchronization of chaotic systems

引用

American control Conference (ACC)

作者： Xiaoxin Liao Guanrong Chen H.O. Wang Department of Control science and Engineering Huazhong University of Science and Technology Wuhan P. R. China Department of Electronic Engineering City University of Hong Kong Kowloon Hong Kong P. R. China Department of Electrical and Computer Engineering Duke University Durham NC USA

The paper discusses the basic problem of chaos synchronization and derives some simple yet explicit conditions for its global convergence verification.

关键词： Chaos control systems Nonlinear control systems Convergence Error correction Equations Laboratories Intelligent control Jacobian matrices Lyapunov method

来源：评论

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Random walk approach to noise reduction in color images 9th

引用

9th International Conference on computer Analysis of Images and Patterns, CAIP 2001

作者： Smolka, B. Szczepanski, M. Plataniotis, K.N. Venetsanopoulos, A.N. Silesian University of Technology Department of Automatic Control Akademicka 16 Str Gliwice44-101 Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada

ISBN: (纸本)9783540425137

In this paper we propose a new algorithm of noise reduction in color images. The new technique of image enhancement is capable of reducing impulsive and Gaussian noise and it outperforms the standard methods of noise reduction. In the paper a smoothing operator, based on a random walk model and on a fuzzy similarity measure between pixels connected by a digital self avoiding path is introduced. The efficiency of the proposed method was tested on the test color image using the objective image quality measures and the results show that the new method outperforms standard noise reduction algorithms. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Noise abatement

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Fast modified vector median filter 9th

引用

9th International Conference on computer Analysis of Images and Patterns, CAIP 2001

ISBN: (纸本)9783540425137

A new filtering approach designed to eliminate impulsive noise in color images, while preserving fine image details is presented in this paper. The computational complexity of the new filter is signif- icantly lower than that of the Vector Median Filter. The comparison shows that the new filter outperforms the VMF, as well as other standard procedures used in color image processing, when the impulse noise is to be eliminated. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Impulse noise

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Geodesic paths approach to color image enhancement

Geodesic paths approach to color image enhancement

引用

IWCIA 2001, 8th International workshop on Combinatorial Image Analysis

作者： Szczepanski, M. Smolka, B. Slusarczyk, D. Plataniotis, K.N. Venetsanopoulos, A.N. Department of Automatic Control Silesian University of Technology Akademicka 16 Str 44-101 Gliwice Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada

New filter class for multichannel image processing is introduced and analyzed. The new technique of image enhancement is capable of reducing impulsive and Gaussian noise and it significantly outperforms the standard methods of noise reduction. In the paper a smoothing operator, based on a random walk model and a fuzzy similarity measure between pixels connected by a digital geodesic path is introduced. The efficiency of the proposed method was tested on the standard color images using the objective image quality measures. Obtained results show that the new method not only outperforms standard noise reduction algorithms, but has some interesting features useful for segmentation of noisy color images. © 2001 Published by Elsevier Science B.V.

关键词： Geodesy

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On a new class of filters for the impulsive noise reduction in color images

On a new class of filters for the impulsive noise reduction ...

引用

International Symposium on Image and Signal Processing and Analysis

作者： B. Smolka A. Chydzinski M. Szczepanski K.N. Plataniotis A.N. Venetsanopoulos Department of Automatic Control Silesian University of Technology Gliwice Poland Department of Electrical and Computer Engineering University of Toronto Toronto Canada

ISBN: (纸本)9539676940

In this paper, a new approach to the problem of impulsive noise reduction for color images is presented. The new image filtering technique is based on the maximization of the similarities between pixels in a predefined filtering window. The new method filters out the noise component, while adapting itself to the local image structures. In this way, the proposed algorithm is able to eliminate impulsive noise, while preserving edges and fine image details. Since the algorithm can be considered as a vector median filter driven by fuzzy membership functions, it is fast and computationally efficient. Experimental results indicate that the proposed filter outperforms other commonly used algorithms for impulsive noise reduction in color images.

关键词： Noise reduction Color Pixel Colored noise Educational institutions Measurement standards Noise measurement Nonlinear filters Filtering algorithms

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On the fast modified vector median filter

On the fast modified vector median filter

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： B. Smolka M. Szczepanski K.N. Plataniotis A.N. Venetsanopoulos Department of Automatic Control Silesian University of Technology Gliwice Poland Department of Electrical and Computer Engineering University of Toronto Toronto Canada

ISBN: (纸本)0780367154

A new filtering approach designed to eliminate impulsive noise in color images, while preserving fine image details is presented in this paper. The computational complexity of the new filter is lower than that of the vector median. The comparison shows that the new filter outperforms the VMF, as well as other standard procedures used in color image processing, when the impulse noise is to be eliminated.

关键词： Filters Color Filtering Colored noise Noise reduction Educational institutions Computational complexity Euclidean distance

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2D sinusoidal amplitude estimation with application to 2D system identification

2D sinusoidal amplitude estimation with application to 2D sy...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Hongbin Li Wei Sun P. Stoica Jian Li Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken NJ USA Department of Systems and Control University of Uppsala Uppsala Sweden Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

We previously studied amplitude estimation of one-dimensional (1D) sinusoidal signals from measurements corrupted by possibly colored observation noise (see Stoica, P. et al., IEEE Trans. on Sig. Proc., vol. 48, p.338-52, 2000). We extend those results for two-dimensional (2D) amplitude estimation. In particular, we investigate the 2D sinusoidal amplitude estimation within the general frameworks of least squares (LS), weighted least squares (WLS), and MAtched FIlterbank (MAFI) estimation. A variety of 2D amplitude estimators are presented, which are all asymptotically statistically efficient. The performances of these estimators in finite samples are compared numerically with one another. Making use of amplitude estimation techniques, we introduce a new scheme for 2D system identification, which is shown to be computationally simpler and statistically more accurate than the conventional output error method (OEM), when the observation noise is colored.

关键词： Amplitude estimation System identification Noise level Least squares approximation Colored noise Additive noise Frequency estimation Application software Sun control systems

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Sliding mode speed control of a shifted fully pitched switched reluctance machine

Sliding mode speed control of a shifted fully pitched switch...

引用

International Conference on electrical Machines and Systems (ICEMS)

作者： H. Ashour B. Williams Department of Electrical & Control Engineering Arab Academy for Science Technology and Maritime Transport Alexandria Egypt Department of Computer Science and Electrical Engineering Heriot-Watt University Edinburgh UK

An experimental speed control drive system for the shifted WIN pitched switched reluctance machine, using the C167 embedded controller, is presented. Methods of speed control and acceleration estimation are discussed. System performance is tested for speed step change, speed reversal, speed tracking and load disturbance responses using proportional plus integral (PI) control and sliding mode (SLM) control. A comparison between proportional plus integral and sliding mode speed control, using Slotine's approach, is experimentally carried out and the robustness of sliding mode control is shown.

关键词： Velocity control Sliding mode control control systems Pi control Proportional control Reluctance machines Acceleration System performance System testing Robust control

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Robust PI and PID controllers including Smith predictor structure

Robust PI and PID controllers including Smith predictor stru...

引用

American control Conference (ACC)

作者： B. Kristiansson B. Lennartson Department of Electrical and Computer Engineering Chalmers Lindholmen Goteborg Sweden Department of Signals and Systems Control and Automation Laboratory Chalmers University of Technology Goteborg Sweden

In this paper PI and PID controllers augmented by a Smith predictor structure are compared to ordinary PI and PID controllers, for plants with medium and great time delays. The comparison is based an a systematic evaluation method, where both robustness and performance aspects in different frequency regions are taken into account. The results show that a Smith predictor increases performance somewhat for a PID controller when the time delay is moderate. For great time delays, however, the improvement is insignificant. An important remark is that it is necessary to include the predictor structure in the design to get acceptable robustness properties. For a PI controller the benefits from a predictor are mostly small or negligible independent of time delay. Most important is, however that a derivative part obviously will bring significantly greater improvement than a Smith predictor to a system with a PI controller. This result is somewhat surprising, since Smith predictors are normally used together with PI and not with PID controllers. Furthermore, it is sometimes argued that it is no use to include derivative action for plants with significant time delay.

关键词： Robust control Three-term control control systems Delay effects Automatic control Frequency Robustness Robust stability Automation Pi control

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On the new filtering technique of noise attenuation in color images

On the new filtering technique of noise attenuation in color...

引用

International Symposium on Image and Signal Processing and Analysis

作者： M. Szczepanski B. Smolka K. Wojciechowski A. Plataniotis A.N. Venetsanopoulos Department of Automatic Control Silesian University of Technology Gliwice Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto Canada

ISBN: (纸本)9539676940

A new filter class for multichannel image processing is introduced and analyzed. The new technique of image enhancement is capable of reducing impulsive and Gaussian noise and it significantly outperforms the standard methods of noise reduction. In the paper, a smoothing operator, based on a random walk model and on a fuzzy similarity measure between pixels connected by a digital geodesic path, is introduced. The efficiency of the proposed method was tested on standard color images using objective image quality measures. Obtained results show that the new method not only outperforms standard noise reduction algorithms, but has some interesting features useful for segmentation of noisy color images.

关键词： Filtering Colored noise Attenuation Color Noise reduction Level measurement Filters Image processing Image analysis Image enhancement

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