On Fast Intra Prediction Mode Decision Algorithm for 4×4 Blocks in H.264
Ying Jun · 2007
In the video-encoding process,the encoding time is greatly influenced by many factors,such as inter/intra mode decision,motion estimation(ME),etc.In order to encode the video with faster speed and beteer quality,this paper only focuses on the intra mode decision in H.264 and presents a fast intra prediction mode decision algorithm for 4×4 blocks in H.264.The proposed algorithm uses:(i) high correlation of RD cost between best prediction mode and its neighborhood prediction mode,(ii) strong correlation between sums of absolute transform differences(SATD) and rate-distortion(RD) performance,efficiently skipping some unlikely prediction modes.Thus,it can complete 4×4 intra prediction by only computing RD cost for four times.The simulation result shows that the proposed algorithm is a good compromise between the coding performance and the encoding speed.