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检索条件"任意字段=Parallel and Distributed Methods for Image Processing IV"

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Interlayer communication mechanisms for a heterogeneous image processing system

Interlayer communication mechanisms for a heterogeneous imag...

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Conference on parallel and distributed methods for image processing

作者： Lau, WC Fung, FY Ercan, MF Hong Kong Polytechnic Univ. (Hong Kong)

ISBN: (纸本)0819425885

A heterogeneous system for image processing was designed. The system consists of two layers with an array of DSPs in the low level layer and an array of PCs in the high level layer. The system resembles two stage multi-layers architecture. In the preprocessing phase, image data is delivered to the low level processors and operations are handled by using SPMD paradigm. The processed data is delivered to the high level processors where feature extraction and recognition tasks are performed. Apparently, the performance of this system is highly depended on communication mechanism used. The communication between two heterogeneous processing layers is a critical design issue and will be described in this paper. In our design, we have employed QuickRing. QuickRing provides a high transfer rate, 160Mbytes/s, and supports Multicast mode of data transmission that is suitable for broadcasting of data.

关键词： QuickRing heterogeneous Multicast performance analysis

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Contract-Linda: A paradigm for programming heterogeneous parallel systems

Contract-Linda: A paradigm for programming heterogeneous par...

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Conference on parallel and distributed methods for image processing

作者： Pycock, D Jackson, RO Univ. of Birmingham (United Kingdom)

ISBN: (纸本)0819425885

Contract-Linda is a novel programming architecture for heterogeneous parallel machines particularly suited to image processing. Previous research has concentrated on static and pre-determined scheduling of computation and on fine grain parallelism. Pre-determined scheduling is satisfactory in cases where the computational process is fully deterministic. However with many image interpretation schemes the flow of control and the nature of the computational procedures can only be determined at run-time. In this paper we describe a programming paradigm for coarse grain and task level parallelism. Task management is based on the Contract Net protocol and utilises the Linda. Coordination Language to provide run-time scheduling. This paradigm accommodates a closely coupled network of heterogeneous processing modules which differ greatly in computational capability;modules based on neural networks, semantic networks, vector and scalar processors are accommodated. Contract;Linda allo-cvs specialised heterogeneous machines to be exploited using a straightforward generic programming model. It does this by providing an internal task management mechanism which ensures that the heterogeneous processing elements are used by the tasks most suited to them and exploits dynamic parallelism within the problem as it is solved. By separating the task of describing the problem from that of describing how the work is carried out on the machine (and providing a solution for this problem) we allow applications to be quickly developed which can effectively utilise specialised machines without the need for specialised programming. We report an experiment to re-implement a cell image interpretation system using Contract-Linda.

关键词： heterogeneous computing parallel computing distributed artificial intelligence image interpretation

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Volume rendering using parallel algebraic logic (PAL) hardware

Volume rendering using parallel algebraic logic (PAL) hardwa...

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Conference on parallel and distributed methods for image processing

作者： Li, HZ Shi, HC Coffield, PC Univ. of Missouri/Columbia (United States) Air Force Wright Lab. (United States)

ISBN: (纸本)0819425885

In this paper, we present the implementation of a volume graphics rendering algorithm using shift-restoration operations on parallel algebraic logic (PAL) image processor. The algorithm is a parallel ray casting algorithm. In order to eliminate shading artifacts caused by inaccurate estimation of surface normal vectors, we use gray level volume instead of binary volume, and apply a low pass filter to smooth the volume object surfaces. By transforming the volume to an intermediate coordinate system to which there is a simple mapping from the object coordinate system, we solve the data redistribution problem caused by nonregular data access patterns in volume rendering. It has been proved very effective in reducing the data communication cost of the rendering algorithm on the PAL hardware.

关键词： volume rendering parallel algorithm mesh processor array

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Job-shop scheduling applied to computer vision

Job-shop scheduling applied to computer vision

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Conference on parallel and distributed methods for image processing

作者： Sebastian, JM Torres, F Aracil, R Reinoso, O Jimenez, LM Garcia, D Univ. Politecnica de Madrid (Spain) Univ. de Alicante (Spain)

ISBN: (纸本)0819425885

This paper presents a method for minimizing the total elapsed time spent by n tasks running on m differents processors working in parallel. ?he developed algorithm not only minimizes the total elapsed time but also reduces the idle time and waiting time of in-process tasks. This condition is very important in some applications of computer vision in which the time to finish the total process is particularly critical -quality control in industrial inspection, real-time computer vision, guided robots, .... The scheduling algorithm is based on the use of two matrices, obtained from the precedence relationships between tasks, and the data obtained from the two matrixes. The developed scheduling algorithm has been tested in one application of quality control using computer vision. The results obtained have been satisfactory in the application of different image processing algorithms.

关键词： scheduling computer vision real-time parallel processing priority algorithm

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Organization of the computer means controlled by the image's parameters

Organization of the computer means controlled by the image's...

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parallel and distributed methods for image processing

作者： Perju, Veacheslav L. Perju, Veacheslav V. Department of Computer Science Technical University of Moldova Stefan Mare Av.168 Kishinau MD-2012 Moldova

A new concept of working out computer means, with the architecture controlled by the parameters of the images (CPI) is being suggested. The methods and processor structures of image parameters determination are presented. The architectures of general purpose multiprocessor computer systems CPI with fixed and reconfigurable structures were elaborated and investigated. The analytical estimation of the image processing time depending on the image parameters, characteristics of the processor conveyor and the image memory modules are presented. The methods of the system organization, which optimize the number of processors, are proposed. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： image processing

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Multiagent boundary detection system: a way to parallel image processing

Multiagent boundary detection system: a way to parallel imag...

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Conference on parallel and distributed methods for image processing

作者： Ballet, P Rodin, V Tisseau, J Ecole Nationale d'Ingenieurs de Brest (France)

ISBN: (纸本)0819425885

In this article, we would like to detect boundaries of objects with the help of a multiagent system made up of reactive agents. The reactivity being very important, the agents' behavior is very simple (perception-action) : they have the capacity, nevertheless, to adapt locally to what they consider their environment, that is to say the image. An agent can move and has its own position in its environment. The basic behavior for an agent consists of following the highest brightness gradient and inscribing its path, if estimating to be on an edge, in all the agents' shared memory. Its path thus corresponds to edges which are found in the image. Please note that, in order to be noise resistant, the path is actually stored in the shared memory only if it is long enough. The notion of shared memory is very important because it allows the interaction among agents and the coordination of their actions. The agents actually use already found edges for finding new ones or complete those already detected. We have tested this system on different grey scale images scenes, but as well on synthetic scenes allowing analysis of thus obtained results. The results are promising and especially fast. Our multiagent system has been tested on a single-processor computer, and it has been note that the number of agents in a simulation neither affects the quality of the result nor CPU time necessary for segmentation of a given scene. We think that this approach is original in its use of agents and may be used to implement parallel image processing by assigning, for instance, an agent to each processor.

关键词： Sensors Edge detection image processing image sensors Actuators Computer simulations Computing systems Environmental sensing image analysis image segmentation

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Model-integrated program synthesis environment for parallel/real-time image processing

Model-integrated program synthesis environment for parallel/...

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parallel and distributed methods for image processing

作者： Moore, Michael S. Sztipanovitz, Janos Karsai, Gabor Nichols, James A. Vanderbilt University Measurement and Computing Systems Laboratory 400 24th Ave S. Nashville TN 37235 United States

In this paper, it is shown that, through the use of model- integrated program synthesis (MIPS), parallel real-time implementations of image processing data flows can be synthesized from high level graphical specifications. The complex details in inherent to parallel and real-time software development become transparent to the programmer, enabling the cost-effective exploitation of parallel hardware for building more flexible and powerful real-time imaging systems. The model integrated real-time image processing system (MIRTIS) is presented as an example. MIRTIS employs the multigraph architecture (MGA), a framework and set of tools for building MIPS systems, to generate parallel real-time image processing software which runs under the control of a parallel run-time kernel on a network of Texas Instruments TMS320C40 DSPs (C40s). The MIRTIS models contain graphical declarations of the image processing computations to be performed, the available hardware resources, and the timing constraints of the application. The MIRTIS model interpreter performs the parallelization, scaling, and mapping of the computations to the resources automatically or determines that the timing constraints cannot be met with the available resources. MIRTIS is a clear example of how parallel real-time image processing systems can be built which are (1) cost-effectively programmable, (2) flexible, (3) scalable, and (4) built from commercial off-the-shelf (COTS) components. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： image processing

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Toward N-dimensional parallel optical image processing

Toward N-dimensional parallel optical image processing

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parallel and distributed methods for image processing

作者： Karasik, Yevgeny B. Nortel Technologies Computer Science Department University of Ottawa 150 Louis Pasteur St. Ottawa ON K1N 6N5 Canada

Encodings of N-dimensional images on planar screens are studied from the standpoint of their suitability for reduction of N-dimensional image processing to 2-dimensional one. Such a reduction, if possible, would allow us to implement N- dimensional image processing optically via 2-dimensional one which is natural to optics. With this goal in mind a planar encoding commutative with respect to set and morphological operations is proposed. Also it is shown how to simulate in the plane N-dimensional geometric duality transform. Based on such a simulation, a constant-time optical algorithm for constructing the convex hull of N-dimensional images is proposed. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： Encoding (symbols)

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Software architecture for application-driven high-performance image processing

Software architecture for application-driven high-performanc...

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parallel and distributed methods for image processing

作者： Koelma, Dennis Jonker, Pieter P. Sips, H.J. Intelligent Sensory Information Systems Department of Computer Science University of Amsterdam Kruislaan 403 1098 SJ Amsterdam Netherlands Pattern Recognition Group Delft University of Technology Lorentzweg 1 2628 CJ Delft Netherlands Department of Computer Science Delft University of Technology Zuidplantsoen 4 2628 BZ Delft Netherlands

The paper introduces a software architecture to support a user from the image processing community in the development of time-constrained image processing applications on parallel computers. The architecture is based on abstract data types with a well defined interface. The interface separates an application from the actual hardware used. On the application side of the interface the programmer is presented with a familiar (sequential) programming model. On the hardware side of the interface detailed knowledge of a parallel machine may be employed to arrive at efficient implementations of basic functionality. Knowledge of both suitable data distributions for images and performance characteristics of operations on those images allows for automated selection of an appropriate data distribution scheme throughout the application. Experiments show that with little effort reasonable levels of efficiency and scalability are achieved on a 32-node MIMD architecture. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： image processing

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parallel environment for parallel image processing on top of PVM

Parallel environment for parallel image processing on top of...

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parallel and distributed methods for image processing

作者： Dehili, Ahmed Akil, Mohamed ESIEE Cité Descartes 2 Bd Blaise Pascal Noisy-Le-Grand 93162 France

This paper presents the implementation of virtual topologies on top of PVM for developing parallel portable image processing on coarse grained machines. It allows the user to define a high level logical numbering to make easy the management and the interaction between tasks. A template convolution primitive has been implemented on 2D mesh topology. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： image processing

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