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, faster detection rate of complete circle detection results were better, with cover or other graphic cover, through not detect