摘要： 音视频编码标准和H.264在帧间编码时采用变长块编码，导致在使用全部模式时计算复杂度较高。为此，提出一种基于运动向量场同质性测量和宏块时空相关性预测的帧间模式选择算法。利用相邻块和参考帧的对应块判断当前宏块是否使用帧间16×16模式，如果不使用该模式，则利用帧间8×8模式产生的运动向量预测宏块的帧间模式。实验结果证明，在峰值信噪比几乎相同的情况下，该算法与全模式相比可平均减少41.2%的编码时间。

关键词: 音视频编码标准, H.264标准, 帧间模式选择, 运动同质性

Abstract: Audio Video coding Standard(AVS) and H.264 achieve significant gain in coding efficiency by adopting variable sizes in inter-frame coding, which leads to high computation complexity when using the full mode decision scheme. This paper presents an inter- frame mode decision algorithm based on the evaluation of the motion homogeneity and the spatial-temporal correlation. The current macro-block 16×16 mode prediction is performed by adopting neighboring macro-blocks and the collocated macro-block in the previous frame. If the prediction fails, the inter-frame mode is predicted by the motion vector, which is generated by using the 8×8 inter-frame mode. Simulation results demonstrate that the algorithm can achieve 41.2% encoding time reduction without any noticeable loss of PSNR.

Key words: Audio Video coding Standard(AVS), H.264 standard, inter-frame mode selection, motion homogeneity

中图分类号: 

• TP301.6