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

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Method of Metadata Synchronization in parallel distributed Databases

Method of Metadata Synchronization in Parallel Distributed D...

引用

2011 IEEE 3rd International conference on Communication Software and Networks(ICCSN 2011)

作者： Hequn Xian,Zhigang Zhao,Jianbo Li College of Information Engineering,Qingdao University Qingdao,China

Metadata in a parallel distributed database contains information about table fragmentation,physical storage distribution,and access control *** is essential to query processing and security policy *** in a parallel distributed database is usually stored in the form of system tables,it can be replicated through out every site in the system in order to improve performance and availability. Changes to the metadata should be aware by every site with acceptable delay and *** this paper,a novel method is proposed to deal with the problem of metadata synchronization in parallel distributed databases.A locking mechanism is devised to coordinate different database operations,it can postpone data moving operations and carries out propagation only when *** with existing methods,it dramatically reduces the communication between different sites,such that situations can be avoided in which all sites require updates simultaneously and a large portion of network bandwidth is consumed at a *** results show the superiority of the proposed method over the others.

关键词： parallel distributed database metadata synchronization access control enforcement

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A Controller-Assisted distributed (CAD) Load Balancing Scheme for ZigBee Networks

A Controller-Assisted Distributed (CAD) Load Balancing Schem...

引用

International conference on parallel processing Workshops (ICPPW)

作者： Kuei-Li Huang Chien-Chao Tseng Jui-Tang Wang Tsung-Hsi Yang Department of Computer Science National Chiao Tung University Hsinchu Taiwan HTC Cooperation Hsinchu Taiwan Cyberlink Cooperation Taipei Taiwan

In this paper, we propose a controller-assisted distributed (CAD) load-balancing mechanism for the ZigBee network containing multiple personal area networks (PANs). Shifting the enforcement part from the central controller to PANs, each PAN in CAD maintains its load status whereas the central controller simply maintains node numbers of PANs and a list of switch pairs which each is formed from two nodes nearby in different PANs, denoting a possible load switch between the two PANs. Upon perceiving a network unbalanced, the controller just provides a heavy-loaded PAN a switch pair and an offload threshold so that the PAN enforces the offload of a sub tree onto a neighbor PAN. The number of nodes in sub tree may be exactly smaller than the threshold due to maintenance situation in PAN. Simulation results show that CAD achieves a same load balancing result as a centralized method which outperforms other methods, yet costing fewer control messages.

关键词： Load management Switches Zigbee Routing Wireless sensor networks Design automation Topology

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Advanced edge-preserving pixel-level mesh data-dependent interpolation technique by triangulation

Advanced edge-preserving pixel-level mesh data-dependent int...

引用

IEEE International conference on Signal processing, Communications and Computing (ICSPCC)

作者： Wei Shao Peiyi Shen Xiao Xiao Liang Zhang Mingliang Wang Zhiqiang Li Chenchong Qin Xiangdong Zhang Xidian university XiAn Shaanxi China

A novel algorithm called "edge-preserving pixel-level interpolation by triangulation" is proposed for interpolating the image. This algorithm can be used in arbitrary resolution enhancement and solve the problem of edge preserving in interpolating the input image. It is simpler than other conventional methods and is adaptable to a various image process. The basic idea is to first estimate the direction of edge in a small region and then use different way to deal with each situation. The most essential point is to maintain the parallelism of lines around edges. Two concepts have been considered in interpolating process: (1) edge direction confirm (2) parallel line preserved. Good experiments results showing the effectiveness of edge preserving and its superiority to other methods are also included.

关键词： Interpolation image edge detection Visualization image reconstruction Computational modeling Adaptation models

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image segmentation with cyclic load balanced parallel Fuzzy C - Means cluster analysis

Image segmentation with cyclic load balanced parallel Fuzzy ...

引用

IEEE International Workshop on Imaging Systems and Techniques (IST)

作者： Mogana Vadiveloo Rosni Abdullah Mandava Rajeswari Ahmad Adel Abu-Shareha School of Computer Sciences Universiti Sains Islam Malaysia Penang Malaysia

This paper proposes a cyclic load balancing strategy to parallel Fuzzy C-Means cluster analysis algorithm. The problem is to minimize the total time cost and maximize the parallel processing efficiency when a subset of clusters is distributed over a set of processors cores on shared memory architecture. The parallel Fuzzy C - Means (FCM) cluster analysis algorithm is composed by two distinct parts. The two distinct parts are; first: the cluster analysis whereby using the FCM algorithm to calculate the cluster centers and second: the evaluation of the subset of clusters whereby using the cluster validity functions to produce the result of the optimal cluster. The experimental result shows that the cyclic load balanced parallel FCM cluster analysis algorithm presents good speed up especially when the size of clusters is large as compared to the parallel FCM cluster analysis algorithm.

关键词： Clustering algorithms Algorithm design and analysis Instruction sets Load management image segmentation Pixel Gray-scale

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Decentralized dynamic resource management support for massively parallel processor arrays

Decentralized dynamic resource management support for massiv...

引用

International conference on Application Specific Systems (ASAP), Architectures and Processors

作者： Vahid Lari Andriy Narovlyanskyy Frank Hannig Jürgen Teich Hardware/Software Co-Design Department of Computer Science University of Erlangen-Nuremberg Germany

This paper presents a hardware-supported resource management methodology for massively parallel processor arrays. It enables processing elements to autonomously explore resource availability in their neighborhood. To support resource exploration, we introduce specialized controllers, which can be attached to each of the processing elements. We propose different types of architectures for the exploration controller: fast FSM-based designs as well as flexible programmable controllers. These controllers allow to implement different distributed resource exploration strategies in order to enable parallel programs the exploration and reservation of available resources according to different application requirements. Hardware cost evaluations show that the cost of the simplest implementation of our programmable controller is comparable to our FSM-based implementations, while offering the flexibility for implementing different exploration strategies. We show that the proposed distributed approach can achieve a significant speedup in comparison with centralized resource exploration methods.

关键词： Registers Arrays Hardware

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GPU Based Implementation of 3DTV System

GPU Based Implementation of 3DTV System

引用

International conference on image and Graphics (ICIG)

作者： Liang-Hao Wang Jing Zhang Shao-Jun Yao Dong-Xiao Li Ming Zhang Institute of Information and Communication Engineering University of Zhejiang Hangzhou China

This paper focuses on the near real-time implementation of end-to-end 3DTV System. It is specially designed for the generation of high-quality disparity map and depth-image-based rendering (DIBR) on the graphics processing unit (GPU) through CUDA (Compute Unified Device Architecture) API. We propose our novel methods including a kind of stereo matching with adaptive windows and an asymmetric edge adaptive filter (AEAF) for industrial application. These algorithms are structured in a way that exposes as much data parallelism as possible and the power of shared memory and data parallel programming in GPU is exploited. We evaluate our proposed methods and implementation based on the benchmark Middlebury and the experiment results show that our method is suitable for application on the trade-off among accuracy and execution speed. Running on an NVIDIA Quadro FX4800 graphics card, for each 480x375 stereo images with 60 disparity levels, the proposed system reaches about 146ms for stereo matching and reaches the speed of DIBR 5.7ms for rendering 1 view or 14ms for rendering 8 views.

关键词： Graphics processing unit Three dimensional displays Instruction sets Rendering (computer graphics) Cameras Acceleration parallel processing

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Error performance of distributed turbo coded cooperative systems over cascaded fading channels

Error performance of distributed turbo coded cooperative sys...

引用

IEEE Signal processing and Communications Applications (SIU)

作者： Hacı İlhan İbrahim Altunbaş Elektrik ve Elektronik Mühendisliği Bölümü Elektrik-Elektronik Fakültesi İstanbul Teknik Üniversitesi Istanbul Turkey

In this paper, error performances of distributed parallel concatenated (turbo) coded relay/cooperative systems, whose component codes are recursive space-time trellis codes are investigated over cascaded fading channels. Two separate systems with one and two relays are considered. In the first system, the relay uses “decode and forward” method while in the second one, the relays use “amplify and forward” and decode and forward methods. Computer simulations are performed under the double Rayleigh fading channel assumption and the superiority of the distributed turbo coded systems is presented.

关键词： Relays Resource description framework Convolutional codes Fading Turbo codes Viterbi algorithm conferences

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Local image quality metric for a distributed smart camera network with overlapping FOVs

Local image quality metric for a distributed smart camera ne...

引用

ACM/IEEE International conference on distributed Smart Cameras, ICDSC

作者： Edward Shen Richard Hornsey Computer Science & Engineering VISOR Laboratory York University Toronto ONT Canada

A set of camera selection templates, using simple rules based on a local (camera) level metric, are implemented for a twelve camera inward-looking distributed smart camera network. The local metric represents the quality of detection for a given camera node of the target-of-interest and is based on a measurable target parameter. To understand the effectiveness of the camera selections, an analytical framework consisting of a global (system) level metric has been designed. The camera selection methods are able to maintain a desirable global metric performance while using a subset of the total cameras available. This is true even when the system undergoes perturbation by the loss of a single camera or by a single occluding target.

关键词： Cameras Calibration Linux Target tracking image processing Smart cameras

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AN image FILTER TECHNIQUE TO RELAX PARTICLE image VELOCIMETRY

AN IMAGE FILTER TECHNIQUE TO RELAX PARTICLE IMAGE VELOCIMETR...

引用

European Signal processing conference

作者： L. Rockstroh S. Wahl Z. Wang P. Werner S. Simon University Stuttgart Institute of Parallel and Distributed Systems

The method particle image velocimetry (PIV) measures particle velocities in natural sciences and engineering based on the determination of the optical flow. Classical PIV requires capturing the particles twice with short delay and with very short exposure time which exceeds the frame rate and the shutter speed of typical imaging systems. Thus, the exposure time is realized with illumination bursts based on double pulse lasers and imaging systems capable of high frame rates are used for capturing the particles. In order to relax PIV measurements, a filter technique is presented that generates both snapshots out of only one single image. This image is captured with a standard imaging system with standard exposure times which relaxes the constrains of the PIV measurement setup significantly. The filter technique is based on spatial filters and its computational complexity is independent from the image content. It also enables the integration of the technique into embedded architectures for real-time PIV. The functionality is demonstrated by taking the example of a particle-based manufacturing process and the measuring error caused by the filter technique is analyzed.

关键词： Particle image velocimetry image motion analysis Segmentation Filtering algorithms

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Method of Metadata Synchronization in parallel distributed Databases

Method of Metadata Synchronization in Parallel Distributed D...

引用

2011 IEEE 3rd International conference on Communication Software and Networks(2011第三届通信软件与网络国际会议 ICCSN2011)

作者： Hequn Xian Zhigang Zhao Jianbo Li College of Information Engineering Qingdao University Oingdao China

Metadata in a parallel distributed database contains information about table fragmentation, physical storage distribution, and access control policies. It is essential to query processing and security policy enforcement Metadata in a parallel distributed database is usually stored in the form of system tables, it can be replicated through out every site in the system in order to improve performance and availability. Changes to the metadata should be aware by every site with acceptable delay and consistency. In this paper, a novel method is proposed to deal with the problem of metadata synchronization in parallel distributed databases. A locking mechanism is devised to coordinate different database operations, it can postpone data moving operations and carries out propagation only when necessary. Compared with existing methods, it dramatically reduces the communication between different sites, such that situations can be avoided in which all sites require updates simultaneously and a large portion of network bandwidth is consumed at a burst. Experiment results show the superiority of the proposed method over the others.

关键词： parallel distributed database metadata synchronization access control enforcement

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