A Fast Intra-frame Prediction Mode Selection Algorithm for H.264 Video Coding
一种H.264帧内预测模式的快速选择算法

In order to guarantee higher compression efficiency and video quality, a robust rate-distortion optimization(RDO) is employed in H.264/AVC video coding standard, which is jointly developed by ITUT and MPEG. According to the specification of RDO, all of the prediction modes have to be tried exhaustively in order to find the best mode. As a result, the computational complexity of the mode decision is extremely high and is not suitable for the real time service, such as video conference.This paper proposes a fast intra prediction modes decision algorithm based on the discrepancy within the video picture. In addition, the Direction-Vector based preferred modes selection method is introduced in the proposed algorithm to reduce the candidate modes to be tested. Experimental results are given to demonstrate that our proposed algorithm achieves a reduction of processing time by 40%~50% as compared with the current RDO optimized mode decision with little quality degradation.