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#1 |
Junior Member
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Join Date: Sep 2018
Device: Kindle
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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. |
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#2 |
the rook, bossing Never.
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Join Date: Jun 2017
Location: Ireland
Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11
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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. |
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#3 | |
Evangelist
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Join Date: May 2013
Location: Ontario, Canada
Device: Kindle KB, Oasis, Pop_Os!, Jutoh, Kobo Forma
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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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#4 | |
the rook, bossing Never.
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Karma: 89531599
Join Date: Jun 2017
Location: Ireland
Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11
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Quote:
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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#5 |
Evangelist
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Join Date: May 2013
Location: Ontario, Canada
Device: Kindle KB, Oasis, Pop_Os!, Jutoh, Kobo Forma
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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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