backstepping对于圆、直线的追踪，可以通过它学习相关对于追踪方面的知识-backstepping for circle track can learn relevant knowledge through its respect for tracking

跟踪鼠标的眼球；时钟；转动但不变色的圆；模拟投骰子；转动并变色的圆。- Clock turning circle, but does not change color eye tracking mouse simulation cast dice rotation and color circle.

此代码用于设计摄像机动态视觉追踪，用户可以圈出目标物体，目标物体移动过程中会一直被跟踪(This code is used to design camera dynamic visual tracking, the user can circle the target object, the target object will be tracked in the process of moving.)