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Stable interest point detection under illumination changes using colour invariants

Stable interest point detection under illumination changes u...

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2005 16th British Machine Vision Conference, BMVC 2005

作者： Faille, Flore Institute for Real-Time Computer Systems Technische Universität München 80290 Munich Germany

ISBN: (纸本)1901725294

Stable interest point detection is relevant for many computer vision applications. However, most detectors are sensitive to illumination changes, as their response varies with image contrast. In the best case, detection stability is increased using a simple image formation model assuming that illumination effects cause slowly varying changes in the image. This does not accurately model shadows and shading (interaction between illumination and scene geometry). Therefore, a new detection method is presented here, which is based on the very popular Harris detector and on the m space [5]. It yields a detection which is invariant to shadows, shading and illumination colour for matte surfaces. A preprocessing scheme is proposed to reduce the sensitivity to colour artifacts caused by demosaicing. The new detector is evaluated on real images acquired under different illuminations by comparison with other interest point detectors. The detection stability is well enhanced, especially for scenes with complex geometry.

关键词： Color

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Distributed embedded real-time systems for education - TTcar

Distributed embedded real-time systems for education - TTcar

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28th International Convention on computers in Technical systems and Intelligent systems, MIPRO 2005

作者： Madritsch, C.V. Real-Time Systems and Computer Science Carinthia Tech Institute Europastrasse 4 Villach 9524 Austria

ISBN: (纸本)9532330127

Distributed Embedded real-time systems are becoming more important in the industrial sector. Applications in the field of automotive, aerospace and industrial control require a deep understanding of system design, implementation as well as validation and verification. These requirements need to be fulfilled during the education of future engineers. The Carinthia Tech institute (CTI), department of real-time systems (RTS), uses real-world applications like a modelsized car to teach the fundamental principles of real-time systems design. © 2005 by MIPRO All rights reserved.

关键词： real time systems

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Bounding worst-case access times in modern multiprocessor systems

Bounding worst-case access times in modern multiprocessor sy...

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Euromicro Conference on real-time systems

作者： J. Stohr A. von Bulow G. Farber Institute for Real-Time Computer Systems

When evaluating worst-case execution times of real-time software on an off-the-shelf multiprocessor system, one should consider the architecture of the underlying hardware. This paper evaluates and discusses the impacts of the chipset of a symmetric multi-processing (SMP) architecture on the execution times of software. It will show how one can obtain worst-case execution times of accesses to main memory and to peripheral devices. This paper also introduces parameters to describe the different impacts on these access times. These parameters reflect the worst-case execution times of a set of uninterrupted accesses at different load conditions. Depending on the real-time requirements, accesses to main memory or to peripheral devices can be performed at different configuration states of hardware. At each state, the worst-case access times differ. This paper shows how these access times can be used for the evaluation of worst-case execution times of real-time software.

关键词： Multiprocessing systems real time systems Hardware computer architecture High performance computing Central Processing Unit Delay effects Bridges Semiconductor device measurement Control systems

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04491 - The Kiel Esterel Processor The Kiel Esterel Processor - A Semi-Custom, Configurable Reactive Processor - Dagstuhl Seminar -

04491 - The Kiel Esterel Processor The Kiel Esterel Processo...

引用

Synchronous Programming - SYNCHRON 2004

作者： Li, Xin von Hanxleden, Reinhard Real-Time and Embedded Systems Group Institute of Computer Science and Applied Mathematics Faculty of Engineering Christian-Albrechts-Universität zu Kiel Germany

The synchronous language Esterel is an established language for developing reactive systems. It gives an abstract, well-defined and executable description of the application, and can be synthesized into hardware and software. Typically, an Esterel program is first translated into other, lower-level languages (such as VHDL or C), and then compiled further. However, there is also the alternative of executing Esterel-like instructions directly. For example, in the REFLIX and RePIC projects, Roop et al. have augmented traditional processors with custom hardware to execute Esterel instructions. This patch strategy is a convenient approach, but has some shortages. We present the Kiel Esterel Processor (KEP), a semi-custom, configurable reactive processor for the direct execution of Esterel programs. It consists of a reactive core and scalable peripheral elements. KEP supports standard Esterel statements directly, except (so far) for the concurrency operator. Valued signals and counter functions in Esterel statements are supported by KEP. Due to its control path and its cooperation with elements, KEP obeys exact Esterel (preemption and priority) rules, including for example abort/weak abort (nests). © 2005 Dagstuhl Seminar Proceedings. All rights reserved.

关键词： Application programs

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Using RTAI/LXRT for partitioning in a prototype implementation of the DECOS architecture

Using RTAI/LXRT for partitioning in a prototype implementati...

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Workshop on Intelligent Solutions in Embedded systems

作者： B. Huber P. Peti R. Obermaisser C. El Salloum Institute of Computer Engineering Real-Time Systems Group University of Technology Vienna Austria

The steady increase in electronics in automotive systems in order to meet the customers expectation of a cars functionality has led to the development of integrated architectures, as already partly deployed in avionics. Integrated architectures overcome the "1 Function - I Electronic Control Unit (ECU)" design philosophy by providing an infrastructure that allows the sharing of ECUs between multiple applications. As a consequence, integrated systems promise massive cost savings through the reduction of resource duplication. In addition, integrated systems permit an optimal interplay of application subsystems, reliability improvements with respect to wiring and connectors, and overcome limitations for spare components and redundancy management. In this paper we present an overview of the DECOS integrated architecture and describe a prototype setup. In particular, we describe how inner component partitioning is provided using the open source RTAI/LXRT Linux operating system. We exploit the functionality of this operating system to be suitable for the DECOS architecture and devise a static dispatching technique that forms the basis for the multiplexing of available resources between applications.

关键词： Prototypes Operating systems Automotive engineering Aerospace electronics Costs Wiring Connectors Redundancy Linux Dispatching

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The diagnostic architecture of the PEGASUS project car

The diagnostic architecture of the PEGASUS project car

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Workshop on Intelligent Solutions in Embedded systems

作者： P. Peti R. Obermaisser H. Paulitsch Institute of Computer Engineering Real-Time Systems Group University of Technology Vienna Austria

The automotive industry is at the verve to deploy computer systems not only for safety-related and comfort functionality, but for safety-critical by-wire systems. In the scope of the PEGASUS project a car will be equipped with time-triggered technology in order to provide not only superior car dynamics but also investigate system design and integration on the basis of a series car. As part of this project a diagnostic solution is being developed in order to tackle prevalent diagnostic problems, such as the trouble-not-identified phenomenon in electronic systems, by exploiting the error-containment properties of the underlying architecture. In this paper we present the diagnostic architecture of the PEGASUS car that operates on the distributed state of the system in order to trace experienced failures back to the origin and decide on the type of fault (e.g., transient vs. permanent, internal vs. external) that is affecting the system. A necessary prerequisite of such an integrated diagnostic infrastructure is the continuous monitoring and subsequent dissemination of diagnostic information in order to allow a meaningful analysis.

关键词： Automotive engineering Consumer electronics Communication system control Circuit faults Monitoring Vehicles computer architecture systems engineering and theory real time systems computer industry

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Measurement-based worst-case execution time analysis

Measurement-based worst-case execution time analysis

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IEEE Workshop on Software Technologies for Future Embedded systems

作者： I. Wenzel R. Kirner B. Rieder P. Puschner Institute of Computer Engineering Real-Time Systems Group University of Technology Vienna Vienna Austria

In the last years the number of electronic control systems has increased significantly. In order to stay competitive more and more functionality is integrated into more and more powerful and complex computer hardware. Due to these advances in control systems engineering new challenges for analyzing the timing behavior of real-time computer systems arise. The two identified main challenges are execution-time modeling of the hardware and the path problem that forbids capturing the worst-case execution time (WCET) by end-to-end measurements due to limits in computational complexity. This work presents the cornerstones of our new measurement-based WCET analysis method that successfully addresses these problems. We clearly identify our research goals and the relevance of our research. Especially, the novel aspects of our approach are emphasized. The conclusion is formed by a brief presentation of an industrial-size case study application.

关键词： time measurement Control systems Power engineering computing Hardware Power engineering and energy systems engineering and theory Timing real time systems Power system modeling Computational complexity

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Hardware implementation of a Mamdani fuzzy logic controller for a static compensator in a multimachine power system

Hardware implementation of a Mamdani fuzzy logic controller ...

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2005 IEEE Industry Applications Conference, 40th IAS Annual Meeting

作者： Mohagheghi, Salman Venayagamoorthy, Ganesh K. Rajagopalan, Satish Harley, Donald G. School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri-Rolla Rolla MO 65409-0249 United States

ISBN: (纸本)0780392086

A Mamdani based fuzzy logic controller is designed and implemented for controlling a STATCOM, which is connected to a 10 bus multimachine power system. Such a controller does not need any prior knowledge of the plant to be controlled and can efficiently provide control signals for the STATCOM during different disturbances in the network. The proposed controller is implemented using the M67 DSP board and is interfaced to the multimachine power system simulated on a real-time Digital Simulator (RTDS). Experimental results are provided, showing that the proposed controller provides more effective damping than the conventional PI controller in a typical large scale disturbance, i.e., a three phase short circuit. © 2005 IEEE.

关键词： Fuzzy control

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A comparison of PSO and backpropagation for training RBF neural networks for identification of a power system with statcom

A comparison of PSO and backpropagation for training RBF neu...

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2005 IEEE Swarm Intelligence Symposium, SIS 2005

作者： Mohaghegi, Salman Del Valle, Yamille Venayagamoorthy, Ganesh K. Harley, Ronald G. School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO 65409-0249 United States University of KwaZulu Natal South Africa

ISBN: (纸本)0780389166

Backpropagation algorithm is the most commonly used algorithm for training artificial neural networks. While being a straightforward procedure, it suffers from extensive computations, relatively slow convergence speed and possible divergence for certain conditions. The efficiency of this method as the training algorithm of a Radial Basis Function Neural Network (RBFN) is compared with that of Particle Swarm Optimization, for neural network based identification of a small power system with a Static Compensator. The comparison of the two methods is based on the convergence speed and robustness of each method. © 2005 IEEE.

关键词： Radial basis function networks

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An adaptive mamdani fuzzy logic based controller for a static compensator in a multimachine power system

An adaptive mamdani fuzzy logic based controller for a stati...

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13th International Conference on Intelligent systems Application to Power systems, ISAP'05

作者： Mohagheghi, S. Venayagamoorthy, G.K. Harley, R.G. IEEE School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri-Rolla MO 65409-0249 United States University of KwaZulu-Natal South Africa

ISBN: (纸本)1599750287

An adaptive Mamdani based fuzzy logic controller has been designed for controlling a Static Compensator (STATCOM) in a multimachine power system. Such a controller does not need any prior knowledge of the plant to be controlled and can efficiently control a STATCOM during different disturbances in the network. A model free approach using the controller output error is applied for training purposes that adaptively changes the controller output parameters based on a gradient descent method. Moreover, shrinking span membership functions are used for a more stable and accurate control performance. Simulation results show that the proposed controller outperforms the conventional PI controller during dynamic and transient disturbances. © 2005 ISAP.

关键词： Programmable logic controllers

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