[Syzygies]

This problem is fundamentally different with stereo images; there is a hope of reconstructing the exact 3D geometry of the page before flattening, rather than inferring from content. An iPhone app that did this would do well.

[radarsat1]

I've always thought it should be possible using a short video of the camera orbiting the page from different angles. (Assuming a static scene of course.)

[manmal]

Or now, some frames of a live photo.

[mzucker]

That sounds like a good idea and pretty straightforward to implement -- now I almost wanna try it...