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	Mpeg2到H.264视频转码中整数DCT预测块的快速合成算法
	孙晓明 ; 陶品 ; 杨士强 ; Xiaoming Sun ; Pin Tao ; Shiqiang Yang
	2010-07-15 ; 2010-07-15
会议名称	第一届建立和谐人机环境联合学术会议（HHME2005）论文集 ; 第一届建立和谐人机环境联合学术会议（HHME2005） ; 中国昆明 ; CNKI ; 中国计算机学会、中国图象图形学学会、ACM SIGCHI中国分会、清华大学计算机科学与技术系
关键词	Mpeg2 H.264 视频转码 优化算法 整数DCT域 Mpeg2, H.264, video transcoding, optimized algorithm, integer DCT domain, block synthesis. TN919.81
其他题名	Optimized Algorithm of Integer DCT Reference Block Synthesis for Mpeg2 to H.264 Transcoding
中文摘要	与Mpeg2相比,H.264对于带宽的节省是全面向其转向的一大动力,这促使了很多关于H.264的研究。在本文中我们提出了两个关于Mpeg2到H.264DCT域内转码的优化算法。第一个优化算法可在整数DCT域内从4个相邻的整数DCT块中合成出与其相交的一个预测参考块用于运动补偿;第二个优化算法进一步解决了需要插值的预测参考块的提取。这两个优化算法均只用到少量的加法和移位运算,对于Mpeg2到H.264的DCT域转码器设计将是非常有用的。; H.264, also known as MPEG-4 part 10, has become a new international standard recently by the effort of the JVT of ITU. It exceeds other video compressing standards by its highly efficient coding solution. Compared with MPEG-2 video, the H.264 video format gives perceptually equivalent video at 1/3 to 1/2 bit rates of the MPEG-2 format. The bandwidth saving of H.264 compared with MPEG-2 provides a big motivation to migrate to H.264, and this inspires the research on MPEG-2 to H.264 transcoding. We proposed two fast algorithms for MPEG-2 to H.264 transcoding in DCT domain in this paper. The first one synthesizes a H.264 integer DCT block for motion compensation from four intersected integer DCT blocks. Further more, we simplified the algorithm to only a few additions and shift operations by the method of decomposing the operation matrices. The second algorithm is an expansion of the first algorithm. It deals with the interpolation while synthesizing the integer DCT block when the motion vectors are not integer and also uses only several additions and shift operations. These two algorithms abandon the multiplications witch are much slower than shift operation. By these algorithms, the computational complexity of the transcoder will be greatly reduced. This could be useful in various DCT domain MPEG-2 to H.264 video transcoding applications. And especially it will benefit to various embedded processors which have no floating-point unit.; 国家863计划2004AA1Z2300项目资助
语种	中文 ; 中文
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/70006]
专题	清华大学
推荐引用方式 GB/T 7714	孙晓明,陶品,杨士强,等. Mpeg2到H.264视频转码中整数DCT预测块的快速合成算法[C]. 见:第一届建立和谐人机环境联合学术会议（HHME2005）论文集, 第一届建立和谐人机环境联合学术会议（HHME2005）, 中国昆明, CNKI, 中国计算机学会、中国图象图形学学会、ACM SIGCHI中国分会、清华大学计算机科学与技术系.

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