一种H.264/AVC帧间块模式抉择快速算法

Fast inter-prediction mode decision for H.264/AVC

传统的H.264/AVC帧间模式抉择采用的是所有模式全搜索的算法,计算量过大。针对这种情况提出了一种利用均匀区域、零运动矢量和小模式合并原理相结合的快速模式抉择算法,并用JM模型进行实验,结果表明,该算法可以在PSNR降低很少(不超过0.03dB)、码率增加不大(小于4%)的情况下提高编码效率,平均编码时间减少了60%以上。

A full search method used in reference software of H. 264 comes at a cost of greatly increased complexity of encoder. A new scheme was proposed to optimize block mode decision and improve the efficiency of the encoder in H. 264/ AVC significantly. Homogeneous area, zero vector and block merging method were combined in this scheme. The experimental results of JM model show that the new scheme is able to achieve a reduction of 60% encoding time on average, with a negligible average peak signal-noise ratio （PSNR） loss（ 〈 0.03dB） and bit rate increase （ 〈 4% ） compared with the original H. 254/AVC reference software.