Easy way to check for pdfs with no text or buggy text?

MarjaE · 03-22-2020, 06:52 PM

Sometimes pdfs just lack text and need ocr. Sometimes they start with text, but lose it to pre-processing bugs. Is there a sort of Quality Check tool for pdfs that can find ones which lack text or have seriously screwed up text?

Quoth · 03-23-2020, 10:15 AM

If you can't select any text in any Linux based PDF reader, then it's only an image.
Selecting and pasting one page into a text editor usually shows if it's rubbish OCR only really to provide search.

BetterRed · 03-23-2020, 05:48 PM

@MarjaE - I'm not aware of any calibre tools that will check pdf content in the way you want.

There maybe a 3rd party utility that can do the check, probably to a single file, meaning you could use it in a script that walked the directory tree.

Best place to ask is in the PDF forum ==>> PDF

BR

03-22-2020, 06:52 PM	#1
MarjaE Guru Posts: 942 Karma: 53902736 Join Date: Jun 2015 Device: multiple	Easy way to check for pdfs with no text or buggy text? Sometimes pdfs just lack text and need ocr. Sometimes they start with text, but lose it to pre-processing bugs. Is there a sort of Quality Check tool for pdfs that can find ones which lack text or have seriously screwed up text?

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03-23-2020, 10:15 AM	#2
Quoth Still reading Posts: 15,176 Karma: 111120239 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	If you can't select any text in any Linux based PDF reader, then it's only an image. Selecting and pasting one page into a text editor usually shows if it's rubbish OCR only really to provide search.

03-23-2020, 05:48 PM	#3
BetterRed null operator (he/him) Posts: 22,046 Karma: 30277960 Join Date: Mar 2012 Location: Sydney Australia Device: none	@MarjaE - I'm not aware of any calibre tools that will check pdf content in the way you want. There maybe a 3rd party utility that can do the check, probably to a single file, meaning you could use it in a script that walked the directory tree. Best place to ask is in the PDF forum ==>> PDF BR

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