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OCR-D / ocrd_anybaseocr

DFKI Layout Detection for OCR-D
Apache License 2.0
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Stricter cropping #70

Open beckstefan opened 3 years ago

beckstefan commented 3 years ago

A DFG requirement when scanning is to show a part of the opposite page. On some pages this tends to be a problem, since anybaseocr-crop does not crop the text and later tools detect text/characters where they shouldn't.

Here are two examples.

cropping_1 cropping_2

What would be a strategy to tackle this?

bertsky commented 3 years ago

AFAICT this processor tries to avoid textual noise via separator line detection. There are a couple of (crappy and badly documented) parameters for this (rular...), but IMHO your best shot here would be trying to increase the contrast so the binarized image shows a distinct, contiguous vertical line where the gutter/spine is.

Besides binarization settings, there is a second workflow detail that might help: If you deskew before cropping, these lines should be easier to detect.

bertsky commented 2 years ago

@beckstefan is this gone with the reimplementation of the cropper?

(If you could post or link to the originals, I could run it...)