How to OCR a Multipage TIFF?

[Pedro Correia]

Hi there, I've read that multipage tiff support is available since v 0.4.1.

Currently, I need OCRopus to run on a multipage TIFF (a book) and output a single hocr containing the whole book's text. However, I've noticed that when I run it, the output provided is the OCR of the first page only, the others are simply ignored.

Is there any argument or something that I can use in order to tell OCRopus that the input is a multipage TIFF and not a regular TIFF file? 

Thanks in advance,

Pedro

[Pedro Correia]

PS: I can't afford to split the multipage tiff into several tiff files, because my groundtruth is a single txt file.

[Philipp Zumstein]

I think this option is not yet supported anymore. BTW where did you read that?

However, it should be possible to achieve your goals with commands like these:

convert multipage.tiff page.png

ocropus-nlbin page*.png

ocropus-gpageseg page*.bin.png

ocropus-rpred page*/*.bin.png

ocropus-hocr page*/*.txt

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[Pedro Correia]

Dear Philipp,

as I said, I can't afford to convert the multipage into several images, due to my groundtruth that is a singles txt file. There's really no way to apply ocropus to a multipage?

Check Tom's post on 0.4.1 release: https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!searchin/ocropus/multipage|sort:relevance/ocropus/KDV0sa8FUOU/y5-1eXo07roJ

Here, Tom refer to the "Subversion version of ocropus", which could supposedly work on multipages: https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!searchin/ocropus/multipage|sort:relevance/ocropus/OcvP0Z2tFj4/IW_3Wt3WFpoJ

However, I couldn't find it, in order to download it.

Em quinta-feira, 16 de fevereiro de 2017 17:37:30 UTC-2, Philipp Zumstein escreveu:

I think this option is not yet supported anymore. BTW where did you read that?

However, it should be possible to achieve your goals with commands like these:

convert multipage.tiff page.png

ocropus-nlbin page*.png

ocropus-gpageseg page*.bin.png

ocropus-rpred page*/*.bin.png

ocropus-hocr page*/*.txt

2017-02-16 17:20 GMT+01:00 Pedro Correia <correia...@gmail.com>:

PS: I can't afford to split the multipage tiff into several tiff files, because my groundtruth is a single txt file.

Em quinta-feira, 16 de fevereiro de 2017 14:18:39 UTC-2, Pedro Correia escreveu:

Hi there, I've read that multipage tiff support is available since v 0.4.1.

Currently, I need OCRopus to run on a multipage TIFF (a book) and output a single hocr containing the whole book's text. However, I've noticed that when I run it, the output provided is the OCR of the first page only, the others are simply ignored.

Is there any argument or something that I can use in order to tell OCRopus that the input is a multipage TIFF and not a regular TIFF file? 

Thanks in advance,

Pedro

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[Philipp Zumstein]

The steps I outlined will produce ONE hocr file in the end containing all your pages. Did you try it out? Afterwards you can for example use something like hocr-eval-lines see https://github.com/tmbdev/hocr-tools#hocr-eval-lines for comparison.

BTW you can find some of the old versions linked here https://github.com/tmbdev/ocropy/wiki/Older-versions , but I don't think you have to use 7 years old versions for your task.

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