张正友的标定工具箱，直接运行会有错误，这是经过修改的工具箱，首先运行calib_gui,确认图像目录在current directory里，然后运行calib_gui_normal,出现图形界面，读取图像，进行标定-Zhang Zhengyou calibration kit, run directly there will be a mistake, this is the modified toolbox, first run calib_gui, confirm the image dir