Fast intra mode decision algorithms of downscaling video transcoding for H.264
H.264分辨率缩减快速帧内宏块模式选择算法研究*

The H.264 video coding standard adopts some new methods for intra prediction.Though these characteristics enhance the efficiency of coding,it also increases the complexity of intra coding.This paper proposed a fast intra mode decision algorithm of spatial downscaling tanscoding for H.264. Fully used the statistic information of the source video stream to estimate the most possible modes and predict directions.The experimental results show that the proposed algorithms can increase the speed of intra coding significantly with neligibal loss of PSNR and increase of bite-rate.