关键词: H.264/AVC, 帧间预测, 模式选择, 时空域相关性

Abstract: H.264/AVC achieves high coding efficiency due to utilizing the full mode decision based on Rate-Distortion Optimization technique（RDO），which brings about tremendous computational complexity.To overcome it，JVT reference software proposes a new fast mode decision algorithm.In this paper，this new algorithm is introduced in detail.Some improved schemes are proposed based on the study and analysis of the advantages of the NFMD，such as early predict the mode of current macroblock，introduce timing terminate criterion，fast intra mode selection determination.Experimental results show that the improved strategies can reduce about 35%~55% of encoding time and 45%~60% of motion estimation time，while the R-D performance and bit rate are almost same as original algorithm.

Key words: H.264/AVC, inter-frame prediction, mode decision, spatio-temporal correlation