H.264编码模式选择快速算法研究

H.264编码标准采用了率失真优化的方法,对各宏块的编码模式逐一进行优化选择,大幅度提高了编码效率和编码质量,但同时也带来了很高的运算复杂度。该文对宏块最佳编码模式进行统计分析,据此在宏块模式选择过程中设计提前终止策略;同时结合宏块的运动和纹理信息分析,根据宏块的特征来选择编码模式。该快速模式选择算法有效地避免了不必要的模式选择过程,大大降低了编码复杂度,加速了编码过程。仿真结果表明,该算法可将编码时间平均降低84%。

Research on fast mode decision algorithm for H.264

The H.264 video coding standard uses rate distortion optimization(RDO) to select the best coding mode for every macroblock,which greatly improves the coding efficiency and quality.However,the coding mode selection is more complex computationally.The statistical analysis of the coding modes led to an early termination strategy for the macroblock mode decision process.Trivial mode selection processes are bypassed based on the motion properties and texture information of the macroblocks.The algorithm effectively speeds-up the coding process.Simulations show that the algorithm reduces encoding time by an average of 84%,with negligible degradation in the coding performance.