1.It will appear as if it was infinitely far away, and won't track object's position, only the direction of Z axis.
它会看上去好像是无限远,而且不会跟踪对象的位置,只沿着Z轴作为方向。
2.A Mean Shift Tracker with the Ability to Track Object with Changing Appearance
一种具有跟踪外观变化目标能力的均值漂移算法