I want to calculate the angle of view (or field of view) from a photograph, without knowing anything about the camera (or lens).
It is assumed the angle between the line CENTER-LEFT and CENTER-RIGHT is 90° in reality.
What I do know:
- The width and height of the image (in px).
- The distances C-VPleft and C-VPright (in px).
- The distance C-CENTER (in m).
- The real angles between LEFT-CENTER-RIGHT. (So in reality and not in the picture.)
I have no other information.
Any help is appreciated.