Camera focus, calibration and other recent study

OpenGL and OpenCL is the relationship?

https://blog.csdn.net/mangobar/article/details/51006521

 

Expectation, variance, covariance and covariance matrix

https://blog.csdn.net/qq_23869697/article/details/80610361

 

The camera focuses on the principle of

http://m.sohu.com/a/203835985_813324

 

The most detailed and complete explanation of camera calibration

https://blog.csdn.net/qq_15295565/article/details/95857385