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检索条件"任意字段=Proceedings of the 1999 Parallel and Distributed Methods for Image Processing III"

共 23 条记录，以下是11-20 订阅

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Component-based design for parallel moment generators

Component-based design for parallel moment generators

引用

proceedings of the 1999 parallel and distributed methods for image processing iii

作者： Lam, K.P. Univ of Keele

Moments are one of the most well known feature descriptors which can be extracted from an image;their mathematical properties and versatility as feature extractors are well studied. This paper presents a design of moment generators, using established techniques in digital filters and Very Scale Integration (VLSI) processing combined under a component-based design framework. Analytically, the moment generator architecture is constructed by cascading single-pole stages of a relatively simple filter suitable for implementation on an ASIC platform, and which is capable of producing a linear combination of moments. Individual set of moments can be extracted, by using dematrixing techniques which could also be realised in the form of a pre-programmable logic table. A parallel implementation of the design is described using C*, a data-parallel extension of ANSIC. Preliminary evaluation of the design and implementation is also presented.

关键词： parallel processing systems

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Computer-aided synthesis of parallel image processing applications

Computer-aided synthesis of parallel image processing applic...

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proceedings of the 1999 parallel and distributed methods for image processing iii

作者： Gennart, Benoit Hersch, Roger D. Ecole Polytechnique Federale Lausanne Switzerland

We present a tutorial description of the CAP Computer-Aided parallelization tool. CAP has been designed with the goal of letting the parallel application programmer having the complete control about how his application is parallelized, and at the same time freeing him from the burden of managing explicitly a large number of threads and associated synchronization and communication primitives. The CAP tool, a precompiler generating C++ source code, enables application programmers to specify at a high level of abstraction the set of threads present in the application, the processing operations offered by these threads, and the parallel constructs specifying the flow of data and parameters between operations. A configuration map specifies the mapping between CAP threads and operating system processes, possibly located on different computers. The generated program may run on various parallel configurations without recompilation. We discuss the issues of flow control and load balancing and show the solutions offered by CAP. We also show how CAP can be used to generate relatively complex parallel programs incorporating neighbourhood dependent operations. Finally, we briefly describe a real 3D image processing application: the Visible Human Slice Server (http://***), its implementation according to the previously defined concepts and its performances.

关键词： image processing

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Precision vs. error in JPEG compression

Precision vs. error in JPEG compression

引用

proceedings of the 1999 parallel and distributed methods for image processing iii

作者： Bins, Jose Draper, Bruce A. Bohm, Willem A.P. Najjar, Walid Colorado State Univ Fort Collins United States

By mapping computations directly onto hardware, reconfigurable machines promise a tremendous speed-up over traditional computers. However, executing floating-point operations directly in hardware is a waste of resources. Variable precision fixed-point arithmetic operations can save gates and reduce clock cycle times. This paper investigates the relation between precision and error for image compression/decompression. More precisely, this paper investigates the relationship between error and bit-precision for the Discrete Cosine Transform (DCT) and JPEG. The present work is part of the Cameron project at the Computer Science Department of Colorado State University. This project is roughly divided in three areas: an C-like parallel language called SA-C that is targeted for image processing on reconfigurable computers, an implementation of the VSIP library for image processing in SA-C, and an optimizing compiler for SA-C that targets FPGAs.

关键词： image compression

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parallel implementation of the adaptive neighborhood contrast enhancement technique

Parallel implementation of the adaptive neighborhood contras...

引用

proceedings of the 1999 parallel and distributed methods for image processing iii

作者： Alto, Hilary Gavrilov, Dmitri Rangayyan, Rangaraj Univ of Calgary Calgary Canada

An adaptive neighborhood contrast enhancement (ANCE) technique was developed to improve the perceptibility of features in digitized mammographic images for use in breast cancer screening. The computationally intensive algorithm was implemented on a cluster of 30 DEC Alpha processors using the message passing interface (MPI). The parallel implementation of the ANCE technique utilizes histogram-based image partitioning with each partition consisting of pixels of the same gray-level value regardless of their location in the image. The master processor allots one set of pixels to each slave processor. The slave returns the results to the master, and the master then sends a new set of pixels to the slave for processing. This procedure continues until there are no sets of pixels left. The subdivision of the original image based on gray-level values guarantees that slave processors do not process the same pixel, and is specifically well-suited to the characteristics of the ANCE algorithm. The parallelism value of the problem is approximately 16, i.e., the performance does not improve significantly when more than 16 processors are used. The result is a substantial improvement in processing time, leading to the enhancement of 4K × 4K pixel images in the range of 20 to 60 seconds.

关键词： image enhancement

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Multi-agent system for optimizing filter coefficients in image compression

Multi-agent system for optimizing filter coefficients in ima...

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proceedings of the 1999 parallel and distributed methods for image processing iii

作者： Shang, Yi Li, Longzhuang Univ of Missouri Columbia United States

In this paper, we present a new intelligent agent-based method to design filter banks that maximize compression quality. In this method, a multi-agent system containing cooperating intelligent agents with different roles is developed to search for filter banks that improve image compression quality. The multi-agent system consists of one generalization agent, and several problem formulation, optimization, and compression agents. The generalization agent performs problem decomposition and result collection. It distributes optimization tasks to optimization agents, and later collects results and selects one solution that works well on all training images as the final output. Problem formulation agents build optimization models that are used by the optimization agents. The optimization formulation includes both the overall performance of image compression and metrics of individual filters. The compression performance is provided by the image coding agent. Optimization agents apply various optimization methods to find the best filter bank for individual training images. Our method is modular and flexible, and is suitable for distributed processing. In experiments, we applied the proposed method to a set of benchmark images and designed filter banks that improve the compression performance of existing filter banks.

关键词： image compression

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Dense array expressions

Dense array expressions

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proceedings of the 1999 parallel and distributed methods for image processing iii

作者： Wilson, Joseph N. Chen, Liang Ming Univ of Florida Gainesville United States

Various researchers have realized the value of implementing loop fusion to evaluate dense (pointwise) array expressions. Recently, the method of template metaprogramming in C++ has been used to significantly speed-up the evaluation of array expressions, allowing C++ programs to achieve performance comparable to or better than FORTRAN for numerical analysis applications. Unfortunately, the template metaprogramming technique suffers from several limitations in applicability, portability, and potential performance. We present a framework for evaluating dense array expressions in object-oriented programming languages. We demonstrate how this technique supports both common subexpression elimination and threaded implementation and compare its performance to object-library and hand-generated code.

关键词： parallel processing systems

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A method to solve the scalability problem in managing massively parallel processing on the Internet 7

A method to solve the scalability problem in managing massiv...

引用

7th Euromicro Workshop on parallel and distributed processing (PDP 99)

作者： Yero, EJH Henriques, MAA UNICAMP DCA FEEC BR-13083970 Campinas SP Brazil

ISBN: (纸本)0769500595

A set of computers connected by the Internet can be seen as a MIMD virtual parallel computer with distributed memory. We call such a computer a Massively parallel Virtual Computer (MPVC). The implementation of an MPVC will be feasible in rite next few years, as new technologies bring to Internet communication speeds undreamed of nowadays. Problems such as Monte Carlo simulations and image processing and generation are good candidates to take advantage of MPVCs, since they can use practically: all rite computing power they can get. Massively parallel processing on the I,Internet introduces the problem of scalability that is, how to administrate efficiently a large number of computers and an even larger number of tasks running in them. Previous approaches either do not scale well or let the programmer solve the problem by himself This paper explains the Dynamic Virtual Hypercubes, a structure created to logically organize an MPVC. Dynamic Virtual Hypercubes provide a scalable and efficient way to handle a large number of computers and tasks, since they can adapt to changes it? workload and number of available machines.

关键词： Monte Carlo methods

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4th International ACPC Conference on parallel Computation, ACPC 1999

引用

4th International ACPC Conference on parallel Computation, ACPC 1999

ISBN: (纸本)3540656413

The proceedings contain 69 papers. The special focus in this conference is on parallel Numerics, parallel Computing in image processing, Video processing, and Multimedia. The topics include: Non-standard parallel solution strategies for distributed sparse linear systems;optimal tridiagonal solvers on mesh interconnection networks;parallel pivots LU algorithm on the cray T3E;experiments with parallel one-sided and two-sided algorithms for SVD;combined systolic array for matrix portrait computation;a class of explicit two-step runge-kutta methods with enlarged stability regions for parallel computers;a parallel strongly implicit algorithm for solution of diffusion equations;a parallel algorithm for lagrange interpolation on k-ary n-cubes;long range correlations among multiple processors;a monte-carlo method with inherent parallelism for numerical solving partial differential equations with boundary conditions;blocking techniques in numerical software;HPF and numerical libraries;an object library for parallel sparse array computation;performance analysis and derived parallelization strategy for a SCF program at the hartree fock level;computational issues in optimizing ophthalmic lens;parallel finite element modeling of solidification processes;architectural approaches for multimedia processing;on parallel reconfigurable architectures for image processing;parallel multiresolution image segmentation with watershed transformation and solving irregular inter-processor data dependency in image understanding tasks.

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Efficient techniques for distributed implementation of search-based AI systems

Efficient techniques for distributed implementation of searc...

引用

International Conference on parallel processing (ICPP)

作者： G. Gupta E. Pontelli Laboratory for Logic Databases and Advanced Programming Department of Computer Science New Mexico State University Las Cruces NM USA

We study the problem of exploiting parallelism from search-based AI systems on distributed machines. We propose stack-splitting, a technique for implementing or-parallelism, which when coupled with appropriate scheduling strategies leads to: (i) reduced communication during distributed execution; and, (ii) distribution of larger grain- sized work to processors. The modified technique can also be implemented on shared memory machines and should be quite competitive with existing methods. Indeed, an implementation has been carried out on shared memory machines, and the results are reported here.

关键词： Artificial intelligence parallel processing Logic programming Laboratories Databases Computer science Read only memory Artificial neural networks Tree graphs image recognition

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Efficient compositing methods for the sort-last-sparse parallel volume rendering system on distributed memory multicomputers

Efficient compositing methods for the sort-last-sparse paral...

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International Conference on parallel processing (ICPP)

作者： Don-Lin Yang Jen-Chih Yu Yeh-Ching Chung Department of Information Engineering Feng Chia University FCU Taichung Taiwan

ISBN: (纸本)0769503500

In the sort-last-sparse parallel volume rendering system on distributed memory multicomputers, as the number of processors increases, in the rendering phase, we can get a good speedup because each processor renders images locally without communicating with other processors. However, in the compositing phase, a processor has to exchange local images with other processors. When the number of processors is over a threshold, the image compositing time becomes a bottleneck. In this paper, we proposed three compositing methods, the binary-swap with bounding rectangle method, the binary-swap with run-length encoding and static load-balancing method, and the binary-swap with bounding rectangle and run-length encoding method, to efficiently reduce the compositing time in the sort-last-sparse parallel volume rendering system on distributed memory multicomputers. The proposed methods were implemented on an SP2 parallel machine along with the binary-swap compositing method. The experimental results show that the binary-swap with bounding rectangle and run-length encoding method has the best performance among the four methods.

关键词： Rendering (computer graphics) Data visualization Encoding Partitioning algorithms Computer graphics Multiprocessing systems Ray tracing Merging

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