Abstract: H.264/AVC emploies RDO technique in inter-frame mode selection to enhance coding efficiency, but it increases computational complexity drastically. The proposed fast algorithm exploits rate distortion characteristic and spatio-temporal correlation among neighboring macroblocks to reduce the range of candidate modes, which can efficiently save the inter prediction complexity. Experimental results show that the approach reduces the coding time by 25%~46% with similar visual quality and bit rate of H.264/AVC.

Key words: H.264/AVC video coding standard, inter-frame prediction, mode decision, rate distortion optimization(RDO)

摘要： H.264/AVC采用RDO技术进行帧间模式选择，提高了编码效率，但增加了计算复杂度。该文提出了快速分类算法，利用相邻宏块率失真特征以及预测模式之间的时空相关性，缩小了模式选择的范围，降低了帧间预测的复杂度。结果表明，该方法可减少25%~46%的序列编码时间，保持了H.264/AVC的编码性能与视觉效果。

关键词: H.264/AVC视频编码标准, 帧间预测, 模式选择, 率失真优化

CLC Number: 

• TP37