Background removal isn't working correctly

[kyrieb-ekat]

Background removal is removing chunks of neumes.

Images show a separated layer made with background removal, and a separated layer made without background removal

[kyrieb-ekat]

@JoyfulGen do you have any other demonstration images? I'll add a couple of the more severe ones too just so we have a better demonstration of the problem.

Significantly this is important because of the later interactive and non-interactive classifier stages, where it struggles quite a bit with these incomplete neumes.

[kyrieb-ekat]

Image produced with a background removal job in the workflow

[kyrieb-ekat]

following up on this to say SAE algorithm seems to perform better, but still has some issues with fine lines (ligatures, custodes; it doesn't "scoop" the middle of notes though, which is an improvement).

Might be worth adding Otsu in Summer 2025, I've liked how it's done on notes and fine details in my image processing stuff, though it can have some problems with page/image shadows. We'll be able to tweak/adjust that in settings, though.

[kyrieb-ekat]

see #1213