[renlo]

How much of an effect does the camera lens make in page warping? Correct me if I'm wrong, but for shorter focal length lenses I would think it would warp the page more. If a person accounted for that, could they get a near perfect result? Or does his algorithm account for that? It seems that one would need to know where the center of the image would be.

[mzucker]

Pretty sure focal length would affect things as you say, but also physical dimensions matter too. My program assumes fixed focal length and then picks the page dimensions that work with the assumed focal length -- almost certainly not the correct ones.