H.264/AVC快速帧间模式选择算法研究

Research on fast inter-frame mode decision algorithm for H.264/AVC

H.264/AVC标准采用可变块运动估计和率失真优化技术进行帧间模式选择,提高了编码效率,但极大地增加了计算复杂度。为了解决这一问题,提出一种快速帧间模式选择算法,它利用了SKIP模式在视频序列中的使用率信息和时空域相邻宏块与当前宏块编码模式之间的高度相关性。该算法缩小了模式选择的范围,并采用阈值来提高预测准确度。仿真结果表明,该算法在保持图像质量和比特率的前提下可以大幅度减少计算复杂度。

H.264/AVC standard employs variable block size Motion Estimation（ME） and Rate Distortion Optimization（RDO） technique in inter-frame mode decision to enhance coding effficiency,but it increases computational complexity drastically.In order to resolve this problem,a fast inter-frame mode decision algorithm is proposed by making use of the adoption information of SKIP mode in sequences and high correlation of coding modes between spatio-temporal adjacent macroblocks and current macroblock. The proposed algorithm reduces the range of candidate modes and uses thresholds to heighten precision of prediction.Simulation results demonstrate that the proposed algorithm can reduce calculation complexity significantly,with negligible small picture quality degradation and slight bitrate increase.