Camera Calibration - Zhang Zhengyou checkerboard calibration method

https://blog.csdn.net/JennyBi/article/details/85764988

http://www.voidcn.com/article/p-uenrynzz-bmp.html

https://blog.csdn.net/weixin_43206570/article/details/84797361 introduce cameras inside and outside participation distortion parameters

https://blog.csdn.net/humanking7/article/details/44756235

https://blog.csdn.net/lql0716/article/details/71973318