How to flatten a fish eye picture (with python)?

Question

I've found programs to turn fish eye pictures into flat ones.

I'd like to learn the process behind the scenes.

Can someone share their knowledge about the technique?

Answer 1

My understanding is that fish eye effect is basically a projection on a semi-sphere, right? To reverse that you need to use equations for projecting a semi-sphere into a plane. A quick search revealed those Fisheye Projection equations, reversing them should be easy. I hope that puts you in the right direction.