Djvu: Extracting ISBN numbers from a large number of books?

MelBr · 12-04-2013, 06:50 PM

Hi all,

I have a large number of old math books and they're all in djvu format and filenames are somewhat messy. I'd like to import them all into Calibre so I can categorize them and fix names etc.

Is there an easy(ier) way to extract ISBN numbers other than converting them all to PDF and then running OCR on all of them? I'd really like to avoid that since that would take very long time, would produce large files, and there's still no guarantee that it would OCR all of the ISBNs properly. Option of last resort is of course to manually type all the ISBN numbers. I'd like to avoid that one of course

Thanks for any tips!

Mel

DaleDe · 12-05-2013, 12:33 PM

I guess it would depend on where the ISBN is stored in the file. This would typically be in some of the metadata. What viewer are you using to look at the file. Can it view the metadata? See DJVU in our wiki for some viewers you might try.

Dale

MelBr · 12-06-2013, 04:33 PM

Thank you for a comment, Dale!

Unfortunately, these files don't seem to have any metadata. I've checked it with few viewers. For example, DjView shows this:

I'm starting to believe that only some type of manual process is the only thing that will work. I'm looking at various OCR software packages to see if any of them can scan only first N pages but then I'll have to extract ISBN manually anyway… or maybe let Calibre plugin extract it somehow. I'm still thinking about the best way to go about this.

DaleDe · 12-06-2013, 08:34 PM

Where do you see the ISBN data? On a title page, near the beginning of the book? I suspect you will need to open the book to see it.

Dale

DaleDe · 12-06-2013, 08:48 PM

You might try the tools at http://djvu.sourceforge.net/index.html. They have a djvused tool that is somewhat like Unix sed to extract data from a file.

Dale

BobC · 12-09-2013, 01:27 PM

I've also found DJVUTOY a useful piece of software for manipulating DJVUs. :

http://www.comicer.com/stronghorse/s...jVuToy_eng.zip

is an English version, unfortunately the main site is in Chinese.

With it you can split and merge DJVUs, insert bookmarks and manipulate hidden text by exporting it, editing it then re-importing it. I used an early version for creating effectively a clickable TOC for a number of DJVUs. Documentation is sparse so a bit of experimentation is needed to get the best out of it.

BobC

willus · 12-21-2013, 07:11 PM

@MelBr -- Any chance a sample .djvu file could be posted?

Noobish · 04-13-2014, 03:35 AM

Quote:

Originally Posted by MelBr

Hi all,

I have a large number of old math books and they're all in djvu format and filenames are somewhat messy. I'd like to import them all into Calibre so I can categorize them and fix names etc.

Is there an easy(ier) way to extract ISBN numbers other than converting them all to PDF and then running OCR on all of them? I'd really like to avoid that since that would take very long time, would produce large files, and there's still no guarantee that it would OCR all of the ISBNs properly. Option of last resort is of course to manually type all the ISBN numbers. I'd like to avoid that one of course

Thanks for any tips!

Mel

I had the same problem, i like my books in pdf since it is compatible with many OS/Devices and can be compressed , for some reason the metadata is lost after conversion to pdf . I use free software btw for that.

check https://www.mobileread.com/forums/showthread.php?t=237519&highlight=[GUI+Plugin]+Extract+ISBN

12-04-2013, 06:50 PM	#1
MelBr Zealot Posts: 105 Karma: 414068 Join Date: Feb 2013 Device: iPad Pro, Kobo Aura One	Djvu: Extracting ISBN numbers from a large number of books? Hi all, I have a large number of old math books and they're all in djvu format and filenames are somewhat messy. I'd like to import them all into Calibre so I can categorize them and fix names etc. Is there an easy(ier) way to extract ISBN numbers other than converting them all to PDF and then running OCR on all of them? I'd really like to avoid that since that would take very long time, would produce large files, and there's still no guarantee that it would OCR all of the ISBNs properly. Option of last resort is of course to manually type all the ISBN numbers. I'd like to avoid that one of course Thanks for any tips! Mel

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12-05-2013, 12:33 PM	#2
DaleDe Grand Sorcerer Posts: 11,470 Karma: 13095790 Join Date: Aug 2007 Location: Grass Valley, CA Device: EB 1150, EZ Reader, Literati, iPad 2 & Air 2, iPhone 7	I guess it would depend on where the ISBN is stored in the file. This would typically be in some of the metadata. What viewer are you using to look at the file. Can it view the metadata? See DJVU in our wiki for some viewers you might try. Dale

12-06-2013, 04:33 PM	#3
MelBr Zealot Posts: 105 Karma: 414068 Join Date: Feb 2013 Device: iPad Pro, Kobo Aura One	Thank you for a comment, Dale! Unfortunately, these files don't seem to have any metadata. I've checked it with few viewers. For example, DjView shows this: I'm starting to believe that only some type of manual process is the only thing that will work. I'm looking at various OCR software packages to see if any of them can scan only first N pages but then I'll have to extract ISBN manually anyway… or maybe let Calibre plugin extract it somehow. I'm still thinking about the best way to go about this.

12-06-2013, 08:34 PM	#4
DaleDe Grand Sorcerer Posts: 11,470 Karma: 13095790 Join Date: Aug 2007 Location: Grass Valley, CA Device: EB 1150, EZ Reader, Literati, iPad 2 & Air 2, iPhone 7	Where do you see the ISBN data? On a title page, near the beginning of the book? I suspect you will need to open the book to see it. Dale

12-06-2013, 08:48 PM	#5
DaleDe Grand Sorcerer Posts: 11,470 Karma: 13095790 Join Date: Aug 2007 Location: Grass Valley, CA Device: EB 1150, EZ Reader, Literati, iPad 2 & Air 2, iPhone 7	You might try the tools at http://djvu.sourceforge.net/index.html. They have a djvused tool that is somewhat like Unix sed to extract data from a file. Dale

12-09-2013, 01:27 PM	#6
BobC Guru Posts: 691 Karma: 3026110 Join Date: Dec 2008 Location: Lancashire, U.K. Device: BeBook 1, BeBook Pure, Kobo Glo, (and HD),Energy Sistem EReader Pro +	I've also found DJVUTOY a useful piece of software for manipulating DJVUs. : http://www.comicer.com/stronghorse/s...jVuToy_eng.zip is an English version, unfortunately the main site is in Chinese. With it you can split and merge DJVUs, insert bookmarks and manipulate hidden text by exporting it, editing it then re-importing it. I used an early version for creating effectively a clickable TOC for a number of DJVUs. Documentation is sparse so a bit of experimentation is needed to get the best out of it. BobC

12-21-2013, 07:11 PM	#7
willus Fuzzball, the purple cat Posts: 1,273 Karma: 11087488 Join Date: Jun 2011 Location: California Device: iPad	@MelBr -- Any chance a sample .djvu file could be posted?

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