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H. 264 /AVC帧内预测模式选择算法研究裴世保,李厚强,俞能海摘 要: H. 264 /AVC采用空间域上的帧内预测技术,进一步提高了编码效率,但由于H. 264 /AVC支持的帧内预测模式数较多,使预测的复杂度大幅度增加。详细分析了帧内预测模式的选择过程,提出一种快速的率失真优化(RDO)模式下的快速Intra_4 ×4模式选择算法,该算法根据SATD( Sum of Absolute Transformed Difference)以及相邻块的预测模式之间的相关性等特征,预先排除了超过65%可能性小的Intra_4 ×4模式,避免了不必要的计算,从而大幅度降低帧内预测的复杂度,同时基本保持了H. 264 /AVC的编码性能。关键词:视频编码;帧内预测;率失真优化中图分类号: TP317. 4; TN919. 8 文献标识码: AResearch of H. 264 /AVC intra2pred icTIon mode selecTIon a lgor ithmPE I Shi2bao,L IHou2qiang, YU Neng2hai(Departm ent of Electronic Engineering and Inform aTIon Science, University of Science and Technology of China,Hefei Anhui 230026, China)Abstract: H. 264 /AVC emp loyed intra2p redicTIon technique in space domain to enhance coding efficiency, but itincreased p rediction comp lexity drastically because of quite a few intra2p rediction modes. A new Intra_4 ×4 mode selectionalgorithm based on rate distortion op timization (RDO ) was p roposed. It emp loyed SATD ( Sum of Absolute TransformDifference) of each block as a judgment and used correlation between p rediction modes of adjacent blocks to filter out morethan 65% less p robable modes beforehand so as to avoid unnecessary computations. The new algorithm reduces the intra2p rediction comp lexity greatly while maintaining coding performance very well.Key words: video coding; intra2p rediction; RDO (Rate Distortion Op timization)
