Device:

Hikvision fisheye ip camera - DS-2CD3955FWD-IWS

Usage:

First, run cali_img_capture.py script and press SPACE button to capture 9x6 chessboard image for calibration (seen here). 30-40 images work fine for calibration.

Next, run hik_cam_calibrate.py to get camera intrinsic parameters and distortion coefficients (K and D).

Last, in hik_cam.py show how to use K and D to undistort images.

Requirements

opencv 3.2.0

Referrence

Here