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HDTV视频编码器系统子图分割并行处理单元的设计与实现
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作者 熊红凯 余松煜 叶玮 《数据采集与处理》 CSCD 2002年第4期408-414,共7页
设计了遵循 MPEG-2 MP@HL压缩标准的 HDTV视频编码器基于水平条状分割系统方案的协议结构、实现模型和控制流程 ,同时也提供了后端并行编码的各子编码器压缩子码流合成的实现机理。分割并行处理方案必须处理两个关键问题 :子图序列编码... 设计了遵循 MPEG-2 MP@HL压缩标准的 HDTV视频编码器基于水平条状分割系统方案的协议结构、实现模型和控制流程 ,同时也提供了后端并行编码的各子编码器压缩子码流合成的实现机理。分割并行处理方案必须处理两个关键问题 :子图序列编码及拼接的同步、子图压缩码率的分配。本文着重就前者的设计实现进行了详细分析 ,根据设计的分割方案定义了特定的图像数据接口协议 ,确保从基本物理层结构到应用层规范都符合 HDTV视频编码器的性能。同时在尽可能满足图像质量一致性的基础上 ,基于几种码率分配策略提供了系统测试结果。 展开更多
关键词 高清晰度电视 HDTV 视频编码器 系统子图分割 并行处理单元 设计 图像处理
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Using Graphics Processing Units to Parallelize the FDK Algorithm for Tomographic Image Reconstruction
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作者 Joel Sancnchez Dominguez Luiz Femando de Oliveira +1 位作者 Nilton Alves Junior Joaquim Teixeira de Assis 《Journal of Chemistry and Chemical Engineering》 2012年第8期760-768,共9页
The paper presents the implementation of a parallel version of FDK (Felkamp, David e Kress) algorithm using graphics processing units. Discussion was briefly some elements the computed tomographic scan and FDK algor... The paper presents the implementation of a parallel version of FDK (Felkamp, David e Kress) algorithm using graphics processing units. Discussion was briefly some elements the computed tomographic scan and FDK algorithm; and some ideas about GPUs (Graphics Processing Units) and its use in general purpose computing were presented. The paper shows a computational implementation of FDK algorithm and the process of parallelization of this implementation. Compare the parallel version of the algorithm with the sequential version, used speedup as a performance metric. To evaluate the performance of parallel version, two GPUs, GeForce 9400GT (16 cores) a low capacity GPU and Quadro 2000 (192 cores) a medium capacity GPU was reached speedup of 3.37. 展开更多
关键词 Computed tomography images reconstruction FDK algorithm GPUS CUDA-C parallel processing.
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Decomposition Method for Complex 3D Problems in Electron Optics
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作者 Valentin Ivanov 《Journal of Physical Science and Application》 2015年第2期96-100,共5页
The decomposition method was successfully used in solving of 3D problems with complex geometry shape in electron optics for the FDM (Finite Difference Method) and FEM (Finite Element Method) mostly to implement fa... The decomposition method was successfully used in solving of 3D problems with complex geometry shape in electron optics for the FDM (Finite Difference Method) and FEM (Finite Element Method) mostly to implement fast and robust parallel algorithms and computer codes. We suggest a new version of similar approach for the BEM (Boundary Element Method) based on the alternating method by Schwartz. This approach substantially reduce the dimension of dense global matrix of algebraic system produced by BEM algorithm to solve a complex problem on as single CPU (Central Processor Unit) desktop computer. New algorithm is iterative one, but exponential convergence for the Schwatlz's algorithm creates the fast numerical procedures. We describe the results of numerical simulation for a multi electrode ion transport system. The algorithms were implemented in the computer code "POISSON-3". 展开更多
关键词 Electron optics decomposition method numerical-analytical technique boundary element method.
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