H．264／AVC帧内预测模式选择的快速算法

H．264视频编解码标准中，帧内预测是很重要的一部分，它显著提高了压缩率，但增加了计算复杂性。H．264帧内预测编码包括9种Intra_4×4和4种Intra_16×16的共13种预测模式，在分析当前帧内预测模式快速算法的基础上，提出设置阈值与变换域相结合的方法来快速选择Intra_4×4、Intra_16×16预测模式的最优模式，并以此对原算法进行了改进。仿真实验表明，改进的算法在保持PSNR和码率微小变化的情况下，计算复杂度能明显降低。

Fast Mode Selective Algorithm of Intra Prediction for H.264/AVC

lntra-prediction is an important feature in the new H. 264 video coding standard , which raised the compression ratio, but increase the computing complexity as well. Intra-prediction coding includes 9 Intra_4×4 and 4 Intra_16×16 13 prediction modes .Based on the analysis of the features of Intra_4×4 and Intra_16×16, a threshold and Integer Transform was proposed to save computation. Then, the algorithms for intra-prediction mode decision was modified. The experimental results show that the proposed algorithm can increase the speed of intra coding significantly with negligible loss of PNSR and a few increase of bite rate.