H.264 adopts multi-mode ME and quarter-pel accuracy fractional pixel search,which brings about large scale of computational cost not only to integer pixel ME but also to fractional pixel ME.

• H.；264由于采用多模式运动估计和四分之一精度搜索；不仅增加了整像素运动估计的计算量；而且也大大增加了分像素搜索运算量。