H.264/AVC is the newest video coding standard, which outperforms the former standards in video coding efficiency in terms of improved video quality and decreased bitrate. Variable block size based mode decision (MD) with rate distortion optimization (RDO) is one of the most impressive new techniques employed in H.264/AVC. However, the improvement on performance is achieved at the expense of significantly increased computational complexity, which is a key challenge for real-time applications. An efficient fast mode decision algorithm is then proposed in this paper. By exploiting the correlation between macroblocks and the statistical characteristics of sub-macroblock in MD, the video encoding time can be reduced 52.19% on average. Furthermore, the motion speed based adjustment scheme was introduced to minimize the degradation of performance.

Abstract

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Abstract-The rate distortion optimization (RDO) enabled mode block), R(s, c, MODEIQP) is contributed by the number of decision (MD) is one ofthe most important techniques introduced by bits based on the MODE and QP. H.264/A VC. By adopting the exhaustive calculation of rate distortion, the optimal MD enhances the video encoding quality.A, -= 085X 2(QP-12)/3 (2) However, the computational complexity is significantly increased, MODEwhich is a key challenge for real-time and low power consumption applications. This paper presents a new fast MD algorithm for