07-15-2024, 01:33 PM | #1 |
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Having trouble OCR-ing a 70MB pdf file
Hey all, I hope this is the appropriate forum section to post this.
I have a PDF of a book I downloaded from archive.og, and have been trying to OCR it with multiple offline programs and online services, but to no avail. I always get unspecified errors and am not sure if it's to do with the file size. Any suggestions would be appreciated. |
07-16-2024, 02:08 PM | #2 |
the rook, bossing Never.
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You need pre-process it with The Gimp or Image Magick or K2pdfopt.
Don't use online tools. You don't write which tools and OS you are using. It's not the file size. |
07-17-2024, 07:30 PM | #3 | |
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Quote:
Sorry, but give up any idea that some one-button OCR is ever going to give you a readable book from old-book scans. |
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07-18-2024, 09:34 AM | #4 | |
the rook, bossing Never.
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Still see Spelling checkers and Grammar checkers miss the same stuff as 40 years ago. Minuscule improvements. OCR needs human proofing and also the IA images need "cleaned" first. |
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07-19-2024, 11:02 AM | #5 |
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Interesting that over the past few years my setup using Tesseract with OCRFeeder as a front end has become considerably better on old book images. Google has been developing it recently, and I understand a new AI/neural network bit has been added, but only for some detail, IIRR.
While old typesetting and generally poor images still cause many errors - especially punctuation - Tesseract can sometimes read words that I struggle to figure out. I rarely have to clean up AI images any more, unless they are really badly tilted, keystoned, or have something geometrically wrong. One recent book, Tesseract was doing fine, but I had to clean up the images so I could read them for proofing! |
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