基于宏块内部特征的H.264快速预测模式决策算法

Fast H.264 inter-prediction mode decision with macro-block information

为了提高视频质量、降低码率，H．264／AVC采用了七种块划分类型，使得在提高编码性能的同时带来了高计算复杂度。研究了宏块的内部特征，提出了一种基于宏块内部信息复杂度的快速帧间模式选择算法。实验数据表明，在保证重建图像信噪比的情况下，该算法降低了帧间预测的复杂度，可平均节省17％～24％的编码时间，满足了实时视频通信的要求。

In the upcoming video coding standard H. 264/AVC, motion estimation（ME） is allowed to use seven kinds of block sizes to improve the rate-distortion performance. This new feature has achieved significant coding gain compared to coding a macro-block（MB） using fixed block size. However, ME is computational intensive with complexity increasing linearly to the number of allowed block sizes. This paper proposed a fast inter-prediction mode decision with block complexity information. The analysis results show that the speed improvement of the proposed algorithm over the primitive algorithm is about 17% to 24% times but with little quality degradation.