中文说明：有关单目标定的很好用，但是切记在单目标定的过程当中不要用手机拍标定板，因为现在的手机都是变焦的。一定要用COMS,或者CCD来获取标定板照片。加油
English Description：
Single target is useful, but keep in mind that on a single target not taken by mobile phone during the calibration plate, because now the phone is zoom. Be sure to use COMS or CCD to obtain a calibration plate pictures. Come on