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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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A 2D systems approach to iterative learning control based on nonlinear adaptive control techniques

A 2D systems approach to iterative learning control based on...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： M. French E. Rogers H. Wibowo D.H. Owens Department of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

ISBN: (纸本)0780366859

We consider the iterative learning control problem from a 2D systems/adaptive control viewpoint. In particular, it is shown how some fundamental results from nonlinear adaptive control can be successfully applied in the iterative learning control domain under very weak assumptions. Some areas for further research are also briefly discussed.

关键词： Iterative methods Nonlinear control systems control systems Adaptive control automatic control Iterative algorithms computer science Systems engineering and theory Robots Manipulators

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Jitter compensation for real-time control systems

Jitter compensation for real-time control systems

引用

Real-Time Systems Symposium (RTSS)

作者： P. Marti J.M. Fuertes G. Fohler K. Ramamritham Automatic Control Department Universitat Poliltècnica de Catalunya Barcelona Spain Department of Computer Engineering Mälardalen University Vasteras Sweden Computer Science and Engineering Department IIT Mumbai India

ISBN: (纸本)0769514200

In this paper, we first identify the potential violations of control assumptions inherent in standard real-time scheduling approaches (because of the presence of jitters) that causes, degradation in control performance and may even lead to instability. We then develop practical approaches founded on control theory to deal with these violations. Our approach is based on the notion of compensations wherein controller parameters are adjusted at runtime for the presence of jitters. Through time and memory overhead analysis, and by elaborating on the implementation details, we characterize when offline and on-line compensations are feasible. Our experimental results confirm that our approach does compensate for the degraded control performance when EDF and FPS algorithms are used for scheduling the control tasks. Our compensation approach provides us another advantage that leads to better schedulability of control tasks. This derives from the potential to derive more flexible timing constraints, beyond periods and deadlines necessary to apply EDF and FPS. Overall, our approach provides guarantees offline that the control system will be stable at runtime-if temporal requirements are met at runtime-even when actual execution patterns are not known beforehand. With our approach, we can address the problems due to (a) sampling jitters, (b) varying delays between sampling and actuation, or (c) both-not addressable using traditional EDF and FPS based scheduling, or by previous real-time and control integration approaches.

关键词： Jitter Real time systems control systems Degradation Sampling methods control theory Runtime Scheduling algorithm Timing Delay

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An integrated approach to real-time distributed control systems over fieldbuses

An integrated approach to real-time distributed control syst...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： P. Marti J.M. Fuertes G. Fohler Department of Automatic Control Universitat Poliltècnica de Catalunya Barcelona Spain Department of Computer Engineering Mälardalen University Vasteras Sweden

ISBN: (纸本)0780372417

The increasing application of flexible and powerful real-time distributed control systems is presently characterizing the industrial automation field. Such systems involve three main disciplines: control systems, real-time systems, and communication systems. control systems, due their stringent timing constraints, demand real-time computing technology. In addition, communication systems are needed for the data messaging between field devices. We propose an integrated approach to the design and implementation of such systems. We show that by a separate control design and its posterior distributed implementation, the system performance may suffer degradation. That is, when control loops are closed over communication networks, timing problems, as communication induced varying delays, can appear, decreasing the control system performance, and even leading the system to instability. However, we show that by an adequate integrated approach, that takes advantage of control theory, real-time communication properties, an adequate timing analysis, and an appropriate distribution of the control functions, the system performance increases dramatically.

关键词： Real time systems Distributed control Communication system control control systems Timing System performance automatic control Communication systems Electrical equipment industry Industrial control

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Comparison of different fault detection algorithms for active body control components: automotive suspension system

Comparison of different fault detection algorithms for activ...

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American control Conference (ACC)

作者： M. Borner M. Zele R. Isermann Institute of Automatic Control Laboratory of Control Engineering and Process Automation Darmstadt University of Technology Darmstadt Germany Department of Computer Automation and Control J. Stefan Institute Ljubljana Slovenia

Fault detection is increasingly an essential part of vehicle development. Integrating such fault detection subsystems raises the reliability, maintainability, and safety of automobile components. Until now, the suspension system was not a safety-critical component, but with the introduction of global chassis control systems this system is getting more important. Therefore, the paper presents fault detection algorithms for the suspension system. Real measurements of a vehicle are made to compare the advantages of the different fault detection algorithms.

关键词： Fault detection Automotive engineering control systems Principal component analysis Vehicle dynamics automatic control Parameter estimation Automation Automobiles Power steering

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On some aspects of discrete equivalents of differential linear repetitive processes

On some aspects of discrete equivalents of differential line...

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IEEE Conference on Decision and control

作者： J. Gramacki A. Gramacki K. Galkowski E. Rogers D.H. Owens Department of Electronics and Computer Science University of Zielona Góra Poland Department of Electronics and Computer Science University of Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield UK

ISBN: (纸本)0780370619

Differential linear repetitive processes are a distinct sub-class of 2D continuous-discrete linear systems which pose problems that cannot (except in a few very restrictive special cases) be solved by the direct application of standard (1D) systems theory and hence by the direct use of a large number of currently-available tools for computer-aided analysis/design. One such area is the construction of discrete approximations to their dynamics. In this paper, we investigate some problems which arise during the discretization of differential linear repetitive processes and develop solutions to them.

关键词： computer science Linear systems computer aided analysis Orbital robotics Robotics and automation Software engineering automatic control Systems engineering and theory Stability

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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...

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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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On the efficiency of random walk approach to noise reduction in color images

On the efficiency of random walk approach to noise reduction...

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IEEE International Conference on Image Processing

作者： B. Smolka M. Szczepanski K.N. 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

We propose a new algorithm of noise reduction in color images. The new technique of multichannel image enhancement is capable of reducing impulse and Gaussian noise and it outperforms the basic methods based on vector median used for noise reduction in color images. A new 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 the standard color images using the widely used objective image quality.

关键词： Noise reduction Color Filters Gaussian noise Level measurement Filtering Image enhancement Smoothing methods Testing Measurement standards

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A volterra operator approach to the stability analysis of a class of 2D linear systems

A volterra operator approach to the stability analysis of a ...

引用

European control Conference (ECC)

作者： M. Dymkov I. Gaishun K. Galkowski E. Rogers D. H. Owens Institute of Mathematics National Academy of Sciences of Belarus Institute of Control and Computation Engineering Technical University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield UK

Repetitive processes are a distinct class of 2D systems of both practical and theoretical interest. Their essential characteristic is repeated sweeps, termed passes, through a set of dynamics defined over a finite duration with explicit interaction between the outputs, or pass profiles, produced as the process evolves. Experience has shown that these processes cannot be studied/controlled by direct application of existing theory (in all but a few very restrictive special cases). This fact, and the growing list of applications areas, has prompted an on-going research programme into the development of a `mature' systems theory for these processes for onward translation into reliable generally applicable controller design algorithms. It has long been considered that Volterra operator techniques should have a key role to play in this general area. In this paper, we first present the necessary properties of a Volterra operator representation for the very important sub-class of so-called discrete linear repetitive processes and then use them to develop a characterization of stability in this setting.

关键词： Stability analysis Process control Equations Europe Vectors control theory

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