Camera calibration method is to use MATLAB
The principle was described in the OpenCV article, so I wo n’t go into details here.
Select the application, and then select the camera calibration.
Click the button and choose to calibrate directly from the existing image or connect the camera.
Enter the width of the grid, the default is 25mm,
click to start the calibration, and export the parameters. 
Finally, enter the relevant parameter commands in the command line window to view the relevant data
