基于hough变换，圆心检测，可达亚像素级别，简单易用，可显示圆心坐标和图像圆心所在位置。解压即可用。main为主程序-Hough transform center detection, with sub-pixel level, easy to use, can display the location of the center coordinates and image the center. Decompression can be used. main main program