说明：  hough 变换检测? Hough变换的基本原理在于，利用点与线的对偶性，将图像空间的线条变为参数空间的聚集点，从而检测给定图像是否存在给定性质的曲线。
(HOUGH TRANSFORM DETECTION circle The basic principle of Hough transform is to use the duality of points and lines to change the lines in image space into the gathering points in parameter space, so as to detect whether a given image has a given curve.)