说明：  目标轮廓跟踪。此处跟踪的是目标的真正轮廓。比如单个像素即跟踪它的四条边，两类目标间的轮廓并不占用任何空间位置。（自己开发的程序）
(Target contour tracking. Here is the goal of tracking the true contour. For example, a single pixel that is tracking its four edges, the outline of two types of goals does not occupy any space location. (Own program))