说明：  文件中有根据经典HOUGH变换算法写的圆检测VC函数,由于圆有三个参数，因此HOUGH算法的圆检测相比直线要慢得多
(Document based on the classic HOUGH transform circle detection algorithm written in VC function, there are three parameters as a result of a round, so HOUGH circle detection algorithm is much slower compared to a straight line)