FAST INTER FRAME ENCODING BASED ON MODES PRE-DECISION IN H.264 (WedPmPO1)

Author(s) : Dongming Zhang (Chinese Academy of Sciences, China) Yanfei Shen (Institute of Computing Technology of Chinese Academy of Sciences, China) Shouxun Lin (Institute of Computing Technology of Chinese Academy of Sciences, China) Yongdong Zhang (Chinese Academy of Sciences, China)

Abstract : The new video coding standard, H.264 allows motion estimation performing on tree-structured block partitioning and multiple reference frames. This feature improves the prediction accuracy significantly, but the cost of which is the complexity and computation load of video coding in H.264 increase drastically. Its reference software adopts a full search scheme and its complexity increases linearly with the number of reference frames and the number of modes respectively. In this paper, we propose a fast mode decision algorithm based on eliminating searching unnecessary modes in H.264. The proposed algorithm takes full use of available information provided by the previously searched process, i.e., macroblock¡¯s best mode in searching the previous reference frames. In algorithm implementation, we use many half-stop conditions to stop motion estimation in advance so as to decrease encoder¡¯s complexity. Simulation results show that this algorithm can effectively reduce complexity of inter-frame encoding, and the quality degradation compared with the original can be ignored. Furthermore, no experimental value is introduced into it, our algorithm is adaptive independent of sequences.

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