How to calibrate?

[mashuaiwudi]

Dear developer,

I appreciate your work very much!
I wonder how can I do calibration in the beginning. Could you please share some ideas?
Thank you very much!

[kenkyusha]

Hello,

I added following scripts:

• tools/get_calib_matrix.py
• tools/get_screen_size.py

Look into them and you can read about camera intrinsic matrix / calibration parameters here:
http://kushalvyas.github.io/calib.html
https://learnopencv.com/camera-calibration-using-opencv/

[mashuaiwudi]

Thank you!
But when I try the get_calib_matrix.py, this line always returns ret = False
ret, corners = cv2.findChessboardCorners(gray, (nx,ny),None)