I need to find the principal point in an image. Its a point where the principal axis intersects the image sensor. Due to misalignment this point is not at the center of image always(or image sensor). I need to precisely determine its location using any of the optical methods available(if any). Any suggestions are greatly appreciated.
More information: The camera is giving me a live feed over a screen and I am able to store, analyze any part of it in real time or later.