多假设运动补偿预测（multi hypothesis motion compensated prediction，MHMCP）算法目前只应用于H264/AVC视频编码标准中B帧的双向预测模式，因为其需对多个运动矢量及参考帧信息进行编码，而且其最终预测信号由前/后向参考帧中的最佳运动补偿信号（假设值）求和取平均值获得，精确性不够。针对MHMCP传统算法的缺陷，提出了一种新的MHMCP算法，即在保持当前最佳编码模式不变的基础上，首先通过加入前/后向运动矢量导出搜索模式来进行假设值的局部优化，并对多假设值进行

Multi hypothesis motion compensated prediction has been used as bi directional prediction mode in B picture of the H264/AVC video compression standardThe optimal motion compensated prediction signal，named hypotheses，is composed of blocks in both forward and backward 〖JP2〗reference pictures，which are simply added and averaged to synthesize the final prediction signalIn the original algorithm，more than one motion vector and reference information has to be encoded and the accuracy of motion compensated prediction is still insufficientTo overcome these disadvantages，a new rate distortion optimization 〖JP〗based MHMCP algorithm is proposedAfter the optimal MBs encoding mode has been obtained by motion estimation and mode decision procedure，bi directional motion search with iterative local motion vector refinements will be startedAt the same time，two extra mv tracking modes which need not to encode additional side information will be examined，accompany with adaptive hypothesis coefficients adjustmentExperimental results show that not only the energy of the residual signal can be decreased but also the quality of the motion compensated prediction signal can be improvedTherefore better R D performance can be achieved by the proposed algorithm