Distance between Cameracenter and Principalpoint

I just calibrated my stereo Camera and the focal length for camera 2 has an fx value diffrent from the fy value.

What I want is the distance between my camera center ("the pinhole") and the principal point on my image(-plane). That should be the focal length, right? But now I'm not sure how to get that distance from my fx and fy value.

Answer 1

[Vandana Rajan]

Hi,

The intrinsic parameters fx and fy are given by fx = F*Sx and fy = F*Sy, where F is the actual physical focal length (in mm) and Sx (in pixels) and Sy (in pixels) are the number of pixels per world unit in x and y directions respectively.

You might find the following article useful

http://ksimek.github.io/2013/08/13/intrinsic/

[Kevin Reich]

thank you that article is great!