低复杂度的H.264帧间编码的模式判决算法  

Low Complexity Mode Decision for H.264 Inter Frame Encoding

作　　者：张冬明[1] 沈燕飞[1] 林守勋[1] 张勇东[1] 

机构地区：[1]中国科学院计算技术研究所

出　　处：《计算机研究与发展》2006年第9期1516-1522,共7页Journal of Computer Research and Development

基　　金：国家自然科学基金项目(60302028);北京市自然科学基金重点项目(4051004);北京市科技计划基金项目(Z0004024040231)

摘　　要：H.264是最新的国际视频编码标准,它能够提供更高的编码效率,但其编码实现也非常复杂,三叉树结构的多编码模式和多帧参考技术是复杂度增加的两个重要因素.针对这两个因素提出一种用于帧间编码的快速模式判决算法FIMDA,它利用编码过程中获得的模式、码率开销等编码信息来减少那些对编码性能影响不大的参考帧和模式的搜索过程,从而降低编码复杂度.实验结果表明,对常用的5帧参考,与全搜索相比,FIMDA可将编码复杂度降低平均85%以上,而PSNR下降仅在0.07dB左右.The new video coding standard, H.264 gives a better encoding performance than previous video standards at the cost of expensive computation since it allows motion estimation performing on tri-ree structured macroblock partitioning and multiple reference frames. In this paper, a fast algorithm FIMDA is proposed to accelerate mode decision of inter macroblock. FIMDA makes full use of valuable cues provided by the previous searching reference frames, such as mode, rate distortion cost etc., to eliminate unnecessary modes and reference frames in the following searching. FIMDA can effectively reduce encoding complexity and the quality degradation compared with full search can be ignored. Simulation results show that average complexity reduction exceeds 85 % and average quality degradation is only about 0.07dB.

关 键 词：H.264 多编码模式 多帧参考 模式判决 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]