一種提高H.261編碼性能的實(shí)現(xiàn)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誤差或絕對(duì)誤差準(zhǔn)則的塊匹配運(yùn)動(dòng)估值算法對(duì)H.261編碼器來說不是最好的。本文提出了一種改進(jìn)的塊匹配運(yùn)動(dòng)估值算法。它所采用的準(zhǔn)則不僅考慮了預(yù)測(cè)誤差能量的大小,還考慮了運(yùn)動(dòng)矢量信息以及幀間預(yù)測(cè)誤差的編碼比特?cái)?shù)目的多少.實(shí)驗(yàn)結(jié)果表明新的準(zhǔn)則能夠顯著地改善H.261的編碼性能。
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關(guān)鍵詞:
- 運(yùn)動(dòng)估值; 視頻編碼
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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