中文说明：
单目标定很好用的程序，对于单目摄像机的一个标定。张正友博士的方法，对于摄像机标定，切记标定板不能用手机拍摄，因为手机拍摄是变焦的。
English Description：
Single target is a very good program, for a monocular camera calibration. Dr. Zhang Zhengyou's method, for camera calibration, remember that the calibration board can't be taken with a mobile phone, because the mobile phone shooting is zoom.