For improving coding efficiency , variable-size block ( 8x8 and 16x16 ) motion estimation is used in MPEG-4 video coding . It is very computing intensive and influences the efficiency of MPEG-4 video coding heavily .
为了提高运动补偿的效率，在MPEG-4压缩编码中采用了变尺寸块（8x8和16x16）运动估计算法，这种算法复杂度高，是影响MPEG-4编码整体效率的关键。
16x16