将检测的边缘点连接成线就是边缘跟踪，常用方法有光栅跟踪和全向跟踪，由于光栅跟踪具有与扫描方向有关的缺陷，往往需要在不同的方向进行多次扫描。-The edge point detection line is connected into the edge of track, and a common method of tracking grating omnidirectional tracking, since the tracking grating having a scanning di