Camera Calibration on Github
https://github.com/udacity/CarND-Camera-Calibration/blob/master/camera_calibration.ipynb
체스보드 이미지
https://docs.opencv.org/2.4/_downloads/pattern.png
Challenge: Calibrate your own camera!
If you're up for a challenge, go ahead and try these steps on your own camera images. Just print out achessboard pattern, stick it to a flat surface, and take 20 or 30 pictures of it. Make sure to take pictures of the pattern over the entire field of view of your camera, particularly near the edges.
To extract object points and image points you can check out the Jupyter notebook inthis repository. If you're following along with the code in the notebook, be sure you set the right size for your chessboard, the link above is to a 9 x 6 pattern, while before we were using an 8 x 6.