Mode Selection Algorithm for Intra-Prediction of H.264
Xingjin Zhang · Jisuanji gongcheng · 2008
H.264 adopts Rate Distortion Optimization(RDO) to enhance coding efficiency at the cost of a very high computational complexity,and it is difficult to be real-timely implemented. By analyzing the factors of the computational complexity of the intra-frame mode selection,a fast algorithm for the intra-frame mode selection is proposed. After computing the SATDs of several modes with strong directivity,then finding out the correlation between the two smallest SATDs to choose,a new mode and expand it to the prediction range. Experimental results show that the total coding time reduces about 25%,and the coding time of I-frame reduces about 62% without obvious PSNR change.