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Thanks, notimp. I read both of your replies carefully. There's a lot of useful practical experience here.
Your points about shadow removal without damaging character edges, keeping double-page scans, and especially the problems with page numbers, hyphenation, paragraph boundaries and scene breaks are very helpful. These are exactly the kinds of details that can be missed when testing OCR on just a few pages.
We've recently started adding book scanning to our Android app, so these are useful areas for us to focus on. I also agree that keeping the original images and making it easy to compare them with OCR results would be important.
Your suggestion about TTS and synchronized reading is interesting too, especially for language learning.
One question: when converting a complete book, which part of the process still takes you the most manual work? And if you know of any particularly difficult public-domain scans, I'd be interested in testing them.
Thanks again for sharing such a detailed workflow!
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