一种新颖的H.264帧内预测快速算法

提出了一种新颖的H.264帧内预测算法．该算法把9种4×4帧内预测(Intra_4×4)模式分为3类，用左面和上面相邻块的模式类预测当前4×4块适合采用的模式类；基于定义的变换系数索引加权绝对值和设计了一种新颖的Intra_4×4模式选择方法；利用连续I帧中16×16帧内预测(Intra_16×16)宏块位置的准平稳性降低了帧内预测的计算复杂度；利用亮度块和色度块帧内预测模式间的相关性加速了色度块的模式选择过程．实验结果表明，本文提出的帧内预测快速算法比Joint Video Team (JVT)-G013平均节省了25%的编码时间，且编码率失真性能较好． :

A Novel Fast Intra Prediction Algorithm for H.264

A novel fast intra prediction algorithm for H.264 is proposed. The nine Intra_4×4 modes are divided into three classes, the suitable mode class for current 4×4-block is predicted using the mode classes of neighboring left and up blocks. A novel Intra_4×4 mode selection method is designed based on the derived sum of absolute values of index-weighted integer transform coefficients. The quasi-stationary of locations of Intra_16×16 macroblocks (MB) in successive I-frames is exploited to reduce the computational complexity of Intra prediction. Mode selection for two chroma 8×8 blocks is accelerated based on the mode correlations between luma blocks and chroma blocks in one MB. Experiments show that the proposed algorithm can save 25% encoding time on average compared with Joint Video Team（JVT）-G013, while with better rate-distortion efficiency.