[Feature request] Descew on multiple lines of reference

[juscghwe]

Would be great if we had an option to add several lines of reference in the manual adjustments.

User story: To undo the book fold I (and most of my coworkers) press down the page. This leads to 'smoother' scans as the left/right page can completely be seen and lines most of the time are clear. But we also cause several new folding lines: The one on the top from the book folding itself (concav) and a new convex line from the bottom. Sometimes these overlap, forming medium complex nets.

I made a screenshot of the resulting net from the two reference lines and highlighted the line where the net is most off. This is not the best example but I dont have a more 'extreme' at hand right now (screenshot on the bottom). From my perspective, adding an optional reference line in the middle would solve this issue in most cases.

Also at https://imgur.com/a/ZZKNdTm

[derycck]

This 4lex4 repository is abandoned.. Please move this feature request to https://github.com/ScanTailor-Advanced/scantailor-advanced