Flattening a scanned book

[Ofnuts]

(12-18-2023, 08:08 PM)Krikor Wrote: Ofnuts, in post #22, showed some skepticism in this task, and appropriately explained why.
But I'm still optimistic and believe he could translate this workflow into a plugin, even with one hand behind his back. 

Looking at it one more time. You have two corrections to make, but they are related. The vertical distortion (bulges at top and bottom) are cause by the change in distance between the camera and the sheet? This part is closer, and so larger. The horizontal distortion (uneven line interval) is a mix between the same distance-induced distortion and the slope of the paper. This whole thing could be deduced by a good mathematician from the shape of the top and bottom edges of the page. But I'm not that guy.

But as usual a bit of care when taking the picture goes a long way to reduce post-processing. The shape of the page is cause by the book being open flat. If you keep the book open at 90°, the pages remain nearly flat and you don' t need any correction.