how to calculate field of view of the camera from camera intrinsic matrix?

Question

I got camera intrinsic matrix and distortion parameters using camera calibration.

The unit of the focal length is pixels, i guess.

Then, how can i calculat

Answer 1

OpenCV has a function that does this. Looking at the implementation (available on GitHub) we have given an image with dimensions w x h and a camera matrix:

    

the equations for the field of view are: