From this point, the algorithm is implemented by searching and constructing a background image efficiently. With regard to global motion models, four-parameter estimation model is adopted.

算法从全局运动估计的基础出发，利用背景宏块运动相似性的特点快速建立背景宏块集合并采用常用的四参数全局运动估计模型估计运动参数。

youdao

Then the global motion vector with rotary Angle can be deduced according to the rigid motion model.

然后利用刚性运动模型，获得包含旋转角度的全局运动矢量。

youdao

A single global scale on the entire head model is fine (e. g. to convert feet to meters, or to shrink or grow the player), but do not scale head motion independent of interpupillary distance (IPD).

对整个头部模型采用单一的全局缩放值很是可以的(例如将英尺转换为米，或将玩家缩小或放大)，但不要缩放瞳距参数。

youdao