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

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

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

引用

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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parallel shrinking to residues with low worst case iteration counts

Parallel shrinking to residues with low worst case iteration...

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parallel and distributed methods for image processing

作者： Hall, Richard W. Department of Electrical Engineering University of Pittsburgh Pittsburgh PA 15261 United States

The problem of shrinking the connected components of binary images to small residues is addressed. A new parallel algorithm is presented with the lowest known worst case time complexity as measured by iteration counts, i.e. [(n c + nr)/2] iterations where the foreground of the image is contained within a rectangular region of size nc X nr pixels. The new algorithm uses a parallel application of operators with small support. It reduces all connected components in any 2D binary image to certain small 1, 2 or 3 point residues. It is potentially useful as a fundamental step in connected component labeling algorithms implemented as fine grain realizations in 2D mesh computing architectures. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： Binary images

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MultiPADDI-2 board for image processing

MultiPADDI-2 board for image processing

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Conference on parallel and distributed methods for image processing

作者： Srini, VP Chow, N Sutton, RA Rabaey, JM Data Flux Systems Inc. MS 292 Berkeley CA 94709 1678 Shattuck Ave. United States University of California EECS Dept. Berkeley CA 94720 United States

ISBN: (纸本)0819425885

We have constructed a prototype image processing board containing 384 processors In 8 VLSI chips. The goal of the prototype is to show how fine grain parallelism present in image processing applications can be exploited by using lots of simple processors inter-connected in clever ways. Each processor has a 16-bit data path, a simple instruction set containing 12 instructions, a simple control unit, and a scan chain for loading data and program, Each VLSI chip, called PADDI-2, contains 48 processors, The programming model used for the processors is MIMD. Each processor has 8 words in the instruction memory. There are internal registers and queues in a processor for storing data and partial results. Data is assumed to be entering the system as a stream and processed by the processors. Each VLSI chip is connected to an external memory (64K x 16). a hardware synchronization mechanism is used for communication between processors;memory, and the external environment. If a sender and receiver is within the same chip, communication can be done in one cycle by the hierarchical interconnect bus structure, Programming the processors and the interconnections are done at compile time. The board is interfaced to a Sun SPARCstation using the SBus. Video input and output is supported by the board and field buffers are used for buffering. Software tools for checking the board, running test programs at the assembly language level, and Libraries for application development have been produced. image processing applications are currently under development. The board is available for experimentation over the Internet. Further details are available from the project web page (http://***/spartan).

关键词： parallel DSP image processing data driven processor data streaming

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Implementing the generalized matrix product on a systolic array parallel architecture

Implementing the generalized matrix product on a systolic ar...

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parallel and distributed methods for image processing

作者： Stright, James R. Air Force Wright Laboratory WL/MNGA Eglin AFB Valparaiso FL 32542 United States

The generalized matrix product includes in its formulation many common array manipulations. It also provides a framework for the expression of a number of important image processing algorithms. It is shown that the generalized matrix product may be implemented in its full generality on systolic array architectures. Two approaches are presented. One approach is to regard the generalized matrix product as a collection of products of small matrices and then consider arrangements of systolic configurations common to the smaller products. A second approach is to embed the two factors of the generalized matrix product in sparse matrices and multiply the sparse matrices using a conventional systolic array. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： Systolic arrays

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K-AVE + GNN + Sobel = An effective, highly parallel edge detector approach

K-AVE + GNN + Sobel = An effective, highly parallel edge det...

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parallel and distributed methods for image processing

作者： Lam, Ka Po Furness, Anthony Automatic Identification Research Laboratory Centre for Electronic Engineering University of Keele Staffs 5T5 5BG United Kingdom

Edge detection is an important first step in many vision tasks where its improvements in speed and efficiency present a continuous challenge for developers of high-speed image recognizers. Classical techniques for accurate detection of edge features, as exemplified by Canny operator, demands such expensive operations as the iterative use of Gaussians and Laplacians, and their designs are largely sequential. Alternatively a variety of complex and edge-preserving filters have been developed to reduce the effects of noise without significantly distorting the edge loci. This paper describes a cascaded precursor approach for edge detection based on selective local contrast modifications which combine point- wise image operators and non-linear transformation. A principal advantage of the approach lies in its simplicity and uniformity of operations;the latter is a characteristic blueprint for efficient (parallel) low-level image processing algorithms. Further, unlike many enhancement algorithms, the characteristics of the proposed precursor can be studied analytically, thus allowing the independent adjustments of detector parameters for maximum performance in the specific environment. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： Edge detection

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parallel progressive rendering of animation sequences at interactive rates on distributed-memory machines 97

Parallel progressive rendering of animation sequences at int...

引用

IEEE 3rd parallel Rendering Symposium (PRS 97) / IEEE Visualization 97

作者： Reisman, A Gotsman, C Schuster, A Department of Computer Science Technion - Israel Institute of Technology Haifa 32000 Israel

ISBN: (纸本)1581130104

We describe a dynamic load-balancing algorithm for ray-tracing by progressive refinement on a distributed-memory parallel computer. parallelization of progressive ray-tracing for single images is difficult because of the inherent sequential nature of the sample location generation process, which is optimized (and different) for any given image. parallelization of progressive ray-tracing when generating image sequences at a fixed interactive rate is even more difficult, because of the time and synchronization constraints imposed on the system. We show how to overcome these problems, which, to the best of our knowledge, have not been treated before. Exploiting the temporal coherence between frames enables us to both accelerate rendering and improve the load-balance throughout the sequence. Our dynamic load-balance algorithm, a blend of local and global methods, accounting not only for rendering performance, but also communication overheads and synchronization issues, is shown to be robust to the harsh environment imposed by a time-critical application, such as the one we consider.

关键词： ray tracing load-balance parallel processing animation distributed memory message passing

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Motion-estimation parallel algorithm based on band matching

Motion-estimation parallel algorithm based on band matching

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parallel and distributed methods for image processing

作者： Yazji, Sausan Bayoumi, Magdy A. Zavidovique, Bertrand Center for Advanced Computer Studies University of Southwestern Louisiana Lafayette LA 70504 United States

A new algorithm to compute the motion vector has been developed based on the block-matching approach in which bands are used instead of blocks. The new band-matching algorithm (BDMA) offers better performance than both the fixed size and variable-size block-matching algorithms because it uses less vectors and processes parts of the image instead of the whole image. The BDMA extracts the likely moving objects, forms the image of differences between initial successive frames in an image sequence, divides each "object" into bands with different sizes, forms a 4 by 4 block around each edge in the band, looks for the type of edges, calculates the different of the textures inside the band, and starts the matching process between frames. Bands are matched according to the number of edges and their type (the type is created and stored using some kind of code-book), and the texture values. Matching results produce a specific vector for the estimated motion. To enhance the performance two independent external memory are employed, they are accessed in parallel. One memory is indexed by the other, one to store the ongoing images, and the second to buffer the bands and results. There sizes and features are adapted to support the application for which the circuit is needed. The new algorithm has been evaluated using several standard video images. ©2005 Copyright SPIE - The International Society for Optical Engineering.

关键词： Motion estimation

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