自己写的一个基于opencv轮廓检测之后判断是否为圆的小程序，基本思想是判断矢量点积，速度比较快，检测率对完整的圆检测效果比较好，有遮挡或者其他图形遮盖、穿越的无法检测-Himself wrote a later opencv contour detection based on the judgment whether the circle of small procedures, the basic idea is to determine the vector dot product, f