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A new parallel vision environment in heterogeneous networked computing

A new parallel vision environment in heterogeneous networked...

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SPIE conference on parallel and distributed methods for image processing II

作者： Kim, KN Choi, TS Ramakrishna, RS KJIST Dept Informat & Commun Kwangju South Korea

ISBN: (纸本)0819429074

Many vision tasks are very complex and computationally intensive. Rear time requirements further aggravate the situation. They usually involve both structured (low-level vision) and unstructured (high-level vision) computations. parallel approaches offer hope in this context. parallel approaches to vision tasks and scheduling schemes for their implementation receive special emphasis in this paper. Architectural issues are also addressed. The aim is to design algorithms which can be implemented on low cost heterogeneous networks running PVM. Issues connected with general purpose architectures also receive attention. The proposed ideas have been illustrated through a practical example (of eye location from an image sequence). Next generation multimedia environments are expected to routinely employ such high performance computing platforms.

关键词： computer vision software environment parallel computing heterogeneous networked computing PVM

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A new global-search method for designing filter banks

A new global-search method for designing filter banks

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SPIE conference on parallel and distributed methods for image processing II

作者： Shang, Y Wah, BW Univ Missouri Dept Comp Engn Sci Columbia MO 65211 USA

ISBN: (纸本)0819429074

In this paper, are present a new global-search method for designing QMF (quadrature-mirror-filter) filter banks. We formulate the design problem as a nonlinear constrained optimization problem, using the reconstruction error as the objective, and the other performance metrics as constraints. This formulation allows us to search for designs that improve over the best existing designs. Due to the nonlinear nature of the performance metrics, the design problem is a nonlinear constrained optimization problem with many local minima. We propose to solve this design problem use global-search methods based on Lagrangian formulations. After transforming the original constrained optimization problem into an unconstrained form using Lagrange multipliers, we apply a new global-search method to find good solutions. The method consists of a coarse-level global-search phase, a fine-level global-search phase, and a local search phase, and is suitable for parallel computation due to the minimal dependency between various key components. In our experiments, we show that our method finds better designs than existing global-search methods, including simulated annealing and genetic algorithms.

关键词： filter bank global search nonlinear constrained optimization quadrature-mirror-filtering (QMF) parallel processing signal processing

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A parallel DSP with memory and I/O processors

A parallel DSP with memory and I/O processors

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SPIE conference on parallel and distributed methods for image processing II

作者： Srini, VP Thendean, J Ueng, SZ Rabaey, JM Data Flux Syst Inc Berkeley CA 94709 USA

ISBN: (纸本)0819429074

The design and implementation of a parallel digital signal processing system on a chip containing 64 computational processors, 16 memory processors, and 16 I/O processors is described. The processors are interconnected by two levels of segmented buses. Each computational processor has a 16-bit data path and a control unit. The instruction set of the 16-bit processor supports computations on streams of data present in video, graphics, image processing, and digital communication applications. Two's complement arithmetic, saturation arithmetic, and packed instructions are supported. Higher data precision such as 32-bit and 64-bit can be achieved by cascading processors. The instruction memory of each computational processor has sixteen 40-bit words. Data streaming through the processor is manipulated by the instructions in the instruction memory. Multiple operations can be performed in a single cycle in a processor. A handshake protocol is used for synchronization between the sending and receiving processors. Six programmable registers are available in each computational processor for storing data. Each memory processor has a 256 x 16 storage unit for storing additional data The memory processors can be statically configured as a delay line, FIFO, lookup table or random access memory. For each memory processor there are four FSMs supporting the four configurations. The I/O processors are provided for external communication. Multiple parallel processing chips, digital output from sensors, and SRAM chips can be interconnected using the I/O processors. The VLSI chip implementing the processors is organized as 16 clusters interconnected by a statically programmable hierarchical bus structure. The buses are segmented by programming the switches on the bus. Each cluster has six 16-bit data buses and four 2-bit control buses for supporting communication between four computational processors, one memory processor, and one I/O processor. In addition, adjacent processors can com

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

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Encoding MPEG-2 video batches using a multiprocessor machine

Encoding MPEG-2 video batches using a multiprocessor machine

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SPIE conference on parallel and distributed methods for image processing II

作者： Kafil, M Ahmad, I Liou, ML Hong Kong Univ Sci & Technol Dept Comp Sci Kowloon Hong Kong

ISBN: (纸本)0819429074

We present a parallel MPEG-2 video encoder on the Intel Paragon parallel computer. Given a video sequence or a set of sequences, the aim of the encoder is to achieve the maximum possible encoding rate. To achieve this aim, the parallel encoder works by a combined scheduling of processors, I/O nodes, and disks, enabling the system to work in a highly balanced fashion through matching of the encoding and I/O rates. An efficient data layout scheme for video frames is also proposed in order for I/O to sustain the desired data transfer rates. Using a small percentage of processors as the I/O nodes, the utilization of the system is also high. More importantly, our encoder is scalable and with an increase in the number of processors will result in a proportional increase in the encoding rate. Given any machine configuration (that is, the number of compute processors, I/O processors, and disks), our propose strategy can logically partition the system and match the I/O and encoding rates to reach the ideal encoding rate. The experimental results indicate about two-fold gain in performance compared to the previous studies. Our approach is useful for compressing a large video sequence or batches of sequences.

关键词： MPEG-2 video encoding parallel processing scheduling Intel Paragon

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A distributed image processing environment VIOS iii and it's performance evaluation

A distributed image processing environment VIOS III and it's...

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International conference on Pattern Recognition

作者： H. Matsuo K. Nakada A. Iwata Department of Electrical and Computer Engineering Nagoya Institute of Technology Nagoya Japan

We proposed a distributed image processing environment VIOS. In this paper, the third version, VIOS iii is proposed. In VIOS iii, a new parallel processing language VPE-p which has flexible syntax for describing parallel algorithms has been developed. The new programmable buffer for accessing global variables through a local area network is also proposed. The description ability for parallel image processing algorithms and processing performance using workstation clusters and a multi processor system are investigated by several image processing and recognition algorithms.

关键词： image processing Pixel

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New Chinese remainder theorems

New Chinese remainder theorems

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Asilomar conference on Signals, Systems & Computers

作者： Yuke Wang Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

ISBN: (纸本)0780351487

The residue-to-binary conversion is the crucial step for residue arithmetic. The traditional methods are the Chinese remainder theorem (CRT) and the mixed radix conversion. This paper presents new Chinese remainder theorems I, II, and Ill for the residue-to-binary conversion, with the following detailed results. (1) The big weights in the original CRT are reduced to a matrix of numbers less than the moduli P/sub i/. (2) The new Chinese remainder theorem I is a parallel algorithm in mixed radix format. The delay is reduced from O(n) to O(logn). (3) The new Chinese remainder theorem II reduces the modulo operation from the size M to a size less than /spl radic/M. (4) The new Chinese remainder theorem II can be easily extended to the new Chinese remainder theorem iii for non-prime moduli sets. (5) A summary of a long list of references on residue-to-binary conversion is also presented.

关键词： Cathode ray tubes Delay image converters Digital arithmetic parallel algorithms Digital signal processing Fast Fourier transforms Digital filters Filtering image processing

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Software platform for parallel image processing and computer vision

Software platform for parallel image processing and computer...

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conference on parallel and distributed methods for image processing

作者： Taniguchi, R Makiyama, Y Tsuruta, N Yonemoto, S Arita, D Kyushu Univ. (Japan)

ISBN: (纸本)0819425885

We describe a general purpose environment for the development of parallel image processing/computer vision algorithms: PRIME (parallel image Media processing Environment). ''General purpose'' here means that the environment is designed so as to be used on a variety of multi-processor systems ranging from tightly-coupled computers to loosely-coupled computers. The key point of the system is that it provides an architecture-independent programming environment for image processing and computer vision. We show the outline of PRIME, its implementation, and its preliminary performance evaluation.

关键词： parallel programming image processing computer vision architecture-independence MPI

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parallel image processing using a Pentium based shared-memory multiprocessor-system

Parallel image processing using a Pentium based shared-memor...

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conference on parallel and distributed methods for image processing

作者： Rothlubbers, C Orglmeister, R Technical Univ. of Berlin (Germany)

ISBN: (纸本)0819425885

This paper describes two different parallel computing approaches for image processing problems on a Pentium based multiprocessor-system. These multiprocessor computers are often used as network servers. We demonstrate the utilization of one of these machines, equipped with four Intel Pentium processors, far a parallel image processing task. A parallel computation of motion vector-fields based on correlation techniques is discussed to show the possible acceleration. The computational results show that a high efficiency can be reached, even a linear speedup is possible under certain conditions. Besides the mentioned correlation technique there are various image processing problems that can easily be evaluated in parallel. Although massively parallel systems and special purpose systems are much faster, off-line image processing can be accelerated by using these broadly available low-cost machines.

关键词： parallel computing multiprocessor-system image processing correlation technique motion vector-field

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Efficient SIMD evaluation of image processing programs

Efficient SIMD evaluation of image processing programs

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conference on parallel and distributed methods for image processing

作者： Wilson, JN Riedy, EJ Univ. of Florida (United States)

ISBN: (纸本)0819425885

SIMD parallel systems have been employed for image processing and computer vision applications since their inception. This paper describes a system in which parallel programs are implemented using a machine-independent, retargetable object library that provides SIMD execution on the Lockheed Mar-tin PAL-I SIMD parallel processor. Programs' performance on this machine is improved through on-the-fly execution analysis and scheduling. We describe the relevant elements of the system structure, the general scheme for execution analysis, and the current cost model for scheduling.

关键词： SIMD image algebra

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Chromosome image segmentation on PAL parallel image processor

Chromosome image segmentation on PAL parallel image processo...

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conference on parallel and distributed methods for image processing

作者： Shi, HC Gader, P Li, HZ Univ. of Missouri/Columbia (United States)

ISBN: (纸本)0819425885

Chromosome image segmentation is an important step toward automatic karyotyping that involves visualization and interpretation of chromosomes. In this paper, we analyze the characteristics of chromosome images that can be effectively used for segmenting chromosomes and can be efficiently extracted on the Lockheed-Martin PAL parallel image processor. We design and implement a parallel algorithm that uses local features to split touching chromosomes.

关键词： parallel algorithm mesh-connected computer chromosome image segmentation

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