一些H.264宏块掩盖的特性

这是昨天看论文的时候看到的，觉得挺有用的。

(a) 76.82% of MBs need only previous one reference frame to get the optimal mode;

(b) if a boundary crosses through an MB, the MB is split into smaller blocks;

(c) 80% optimal motion vectors are determined by nearest reference frame;

(d) if 16*16 mode is selected, the optimal reference frame tend to be unchanged;

(e) if smaller blocks are selected, searching more frames tends to be helpful.

The characteristics (a) and (b) are used to determined the block mode of demaged block. The characteristics (c), (d) and (e) are used to select reference frame to improve error concealment performance.