一种提高H.261编码性能的实现方法
AN IMPLEMENTATION METHOD FOR IMPROVING H.261 VIDEO CODER
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摘要: 研究表明采用最小均方误差或绝对误差准则的块匹配运动估值算法对H.261编码器来说不是最好的。本文提出了一种改进的块匹配运动估值算法。它所采用的准则不仅考虑了预测误差能量的大小,还考虑了运动矢量信息以及帧间预测误差的编码比特数目的多少.实验结果表明新的准则能够显著地改善H.261的编码性能。
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关键词:
- 运动估值; 视频编码
Abstract: This paper proposes a method to improve H.261 video coder by modifying the block matching motion estimation algorithm. We think that the traditional block matching algorithm based on the least mean square error or absolute error criteria is not suitable for H.261 video coder. The good criteria must consider not only the error energy, but also the bit number for encoding motion vectors as well as the interframe prediction error. Experimental results show that the performance of H.261 coder is improved greatly by using the proposed implementation method. -
[1] CCITT Recommendation H.261, Video Codec for Audiovisual Services at P64kbits/s, Geneva: 1990. [2] MPEG, ISO CD11172.2: Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbita/s, Nov. 1991. [3] Jain J R, Jain A K. Displacement measure and its application in interframe image coding. IEEE Trans. on COM, 1981, COM-29(12):1799-1806. [4] Musmann H G, Pirsch P, Grallert H J. Advances in picture coding, Proc[J].IEEE.1985, 73(4):523-548 [5] Joag H M, Chen L G, Chiueh T D. Accuracy improvement and cost reduction of 3-step search block matching algorithm for video wding, IEEE Trans. on CASVT, 1994, 4(1): 88-90. -
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