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检索条件"机构=Department of Computer Engineering and Automatic Control"

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On the modified weighted vector median filter 14

On the modified weighted vector median filter

引用

14th International Conference on Digital Signal Processing, DSP 2002

作者： Smolka, B. Szczepanski, M. Plataniotis, K.N. Venetsanopoulos, A.N. Department of Automatic Control Akademicka 16 Str Silesian University of Technology 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)0780375033

A new filtering approach designed to eliminate impulsive noise in color images, while preserving Jine image details is presented. The computational complexity of the new filter is significantly lower than that of the Weighted Vector Median Filter (WVMF). The comparison shows that the new filter outperforms the WVMF, as well as other standard procedures used in color image filtering for the removal of impulsive noise. © 2002 IEEE.

关键词： Impulse noise

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Forward and backward anisotropic diffusion filtering for color image enhancement 14

Forward and backward anisotropic diffusion filtering for col...

引用

14th International Conference on Digital Signal Processing, DSP 2002

作者： Smolka, B. Szczepanski, M. Plataniotis, K.N. Venetsanopoulos, A.N. Department of Automatic Control Silesian University of Technology 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)0780375033

In this paper a novel approach to the problem of edge preserving smoothing, which allows to break an image into a set of homogeneous regions, is proposed and evaluated. The new algorithm is based on the combined forward and backward anisotropic diffusion with incorporated time de-pendent cooling process. This method is able to efficiently remove image noise while preserving and enhancing image edges. © 2002 IEEE.

关键词： Image enhancement

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On the coupled forward and backward anisotropic diffusion scheme for color image enhancement 1

引用

International Conference on Image and Video Retrieval, CIVR 2002

作者： Smolka, Bogdan Plataniotis, Konstantinos N Department of Automatic Control Silesian University of Technology Akademicka 16 Str Gliwice44-101 Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10K ing’s College Road Toronto Canada

ISBN: (数字)9783540454793

ISBN: (纸本)9783540438991

The use of low-level visual features to search and retrieve information in the multimedia databases has drawn much attention in the recent years [1,2]. Many of the existing techniques of image retrieval are based on image segmentation, which is a difficult task in many practical situations due to image noise and various compression artifacts. In this paper a novel approach to the problem of edge preserving smoothing, which allows to break an image into a set of homogeneous regions, is proposed and evaluated. The new algorithm is based on the combined forward and backward anisotropic diffusion with incorporated time dependent cooling process. This method is able to efficiently remove image noise while preserving and enhancing image edges. The proposed algorithm can be used as a first step of different techniques, which are based on color, shape and spatial location information, to search and retrieve information from multimedia databases. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Image segmentation

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On the fast modification of the vector median filter

On the fast modification of the vector median filter

引用

International Conference on Pattern Recognition

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

A new filtering approach designed to eliminate impulsive noise in color images, while preserving fine image details is presented in this paper. The comparison shows that the new filter outperforms the VMF, as well as ... 详细信息

ISBN: (纸本)076951695X

关键词： Filters Noise reduction Colored noise Color Pixel Noise figure Strontium Educational institutions Filtering Euclidean distance

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Prediction in iterative learning control schemes versus learning along the trials 15th

Prediction in iterative learning control schemes versus lear...

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15th World Congress of the International Federation of automatic control, 2002

作者： Rzewuski, M. Rogers, E. Owens, D.H. Dept. of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783902661746

Recent years has seen much progress in the theory and application of iterative learning control schemes for both linear and (classes of) nonlinear dynamics. In the case of the former, many algorithms based on minimizing a suitable cost function have been reported. Here the interest is in the so-called norm optimal approach where the basic philosophy is to compute the control input on the current trial such that the tracking error is reduced in an optimal way without too much deviation from the control input used on the previous trial. This paper compares the performance of a range of controllers arising from use of the norm optimal approach - both stand alone and against alternatives. Copyright © 2002 IFAC.

关键词： Iterative methods

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Two - Level dissolved oxygen control for activated sludge processes 15th

Two - Level dissolved oxygen control for activated sludge pr...

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15th World Congress of the International Federation of automatic control, 2002

作者： Brdys, M.A. Chotkowski, W. Duzinkiewicz, K. Konarczak, K. Piotrowski, R. Department of Automatic Control Technical University of Gdansk ul. G. Narutowicza 11/12 Gdansk80 952 Poland School of Electronic Electrical and Computer Engineering University of Birmingham BirminghamB15 2TT United Kingdom

ISBN: (纸本)9783902661746

Two-level controllers for dissolved oxygen reference trajectory tracking for activated sludge processes is proposed and investigated. Both the nutrient and the phosphorous removal from a wastewater by its biological treatment using an activated sludge technology are considered. Typically, an aeration system itself is a complicated hybrid nonlinear dynamical system with faster dynamics compared to internal dynamics of the dissolved oxygen at a biological reactor. It is common approach to neglect this dynamics and also important operational limitations of this system such as a limited frequency of allowed switching of the blowers. The paper proposes a two level controller to track prescribed dissolved oxygen trajectory. The upper level control unit produces desired aeration flow set points. For this unit the aeration system is an actuator. The nonlinear model predictive control algorithm is applied to design this controller unit. Also, the predictive control is used to design the lower level control unit based on a linearised hybrid dynamics of the aeration process. The overall controller is validated by simulation using real data sets and ASM2d model of the biological reactor. Copyright © 2002 IFAC.

关键词： Dissolved oxygen

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On the fast modification of the vector median filter

On the fast modification of the vector median filter

引用

作者： Smolka, B. Szczepanski, M. 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

关键词： Optical filters

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Improving quality-of-control using flexible timing constraints: metric and scheduling

Improving quality-of-control using flexible timing constrain...

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

Closed-loop control systems are dynamic systems subject to perturbations. One of the main concerns of the control is to design controllers to correct or limit the deviation that transient perturbations cause in the controlled system response. The smaller and shorter the deviation, the better the achieved performance. However, such controllers have been traditionally implemented using fixed timing constraints (periods and deadlines). This precludes controllers to execute dynamically, accordingly to the system dynamics, which may lead to sub-optimal implementations: although higher execution rates may be preferable when reacting to perturbations in order to minimize the response deviations, they imply wastage of resources when the system is in equilibrium. In this paper we argue and demonstrate that the responsibility of maximizing the performance of closed-loop systems relies on both the controller designer and the scheduler. We show that the dynamic optimization of the quality of the controlled system response calls for (a) flexible control task timing constraints that deliver effective control performance; flexible constraints allow us to achieve faster reaction by adaptively choosing the controller sampling rate and completion time upon transient perturbations, (b) a quality-of-control (QoC) metric; it associates with each control task timing a quantitative value expressing control performance (in terms of the closed-loop system error), and (c) new scheduling approaches; their goal is to quickly react to perturbations by dynamically scheduling tasks based on the chosen control task execution parameters to maximize the QoC. This combination offers the possibility of taking scheduling decisions based on the control information for each control task invocation, rather than using fixed timing constraints with constant periods and deadlines.

关键词： Timing control systems Sampling methods Dynamic scheduling automatic control Constraint theory Delay effects Processor scheduling control theory Real time systems

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A SOM-based document clustering using phrases

A SOM-based document clustering using phrases

引用

International Conference on Neural Information Processing

作者： J. Bakus M.F. Hussin M. Kamel Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada Department of Computer Science & Automatic Control Alexandria University Alexandria Egypt

ISBN: (纸本)9810475241

Most of the existing techniques for document clustering rely on a "bag of words" document representation. Each word in the document is considered as a separate feature, ignoring the word order. We investigate the use of phrases rather than words as document features for the document clustering. We present a phrase grammar extraction technique, and use the extracted phrases as the features in a self-organizing map based document clustering algorithm. We present clustering results using the REUTERS corpus and show an improvement in clustering performance using both entropy and F-measure evaluation measures.

关键词： Data mining Clustering algorithms Machine learning Merging computer science automatic control Entropy Internet Information retrieval Organizing

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Selection of the best stereo pair in a multi-camera configuration

Selection of the best stereo pair in a multi-camera configur...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： J. Amat M. Frigola A. Casals Robotics Institute IRI UPC-CSIC Barcelona Spain Department of Automatic Control and Computer Engineering Technical University Catalunya Barcelona Spain

The analysis of the error of stereo measurements by triangulation is revisited from three points of view: geometrical, statistical and visual quality. When the target is visible by a set of distributed cameras in the workspace, there are multiple combinations of camera pairs adequate to be considered for the location, by triangulation, of the target position. Three-camera placements are analysed evaluating their precision in a short-medium distance. The work presented analyses which combination of stereo measurements gives the best results, and proposes a method for the automatic selection of the most adequate cameras pair.

关键词： Cameras Robot vision systems Force control automatic control Stereo vision Calibration Uncertainty Pixel Error analysis Robotics and automation

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