Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ

Binarization

DIY Book Scanner Skunk Works. Share your crazy ideas and novel approaches. Home of the "3D structure of a book" thread.
murgen
Posts: 16
Joined: 22 Sep 2012, 03:45
E-book readers owned: Kindle
Number of books owned: 1000
Country: Belgium

Re: Binarization

Post by murgen » 31 Dec 2014, 04:54

most interresting. At the same time I point in variant of Howe's algorithm to the 'R' of learned which has been degraded but with good chances to still be recognised. I notice that the 'h' in the 'the' before 'sacrif' is lost in all cases and may be translated as 'tlie' unless the OCR resort to a dictionary and grammar which I don't know if any of them do it.

mera461
Posts: 7
Joined: 27 Dec 2013, 07:08
Number of books owned: 0
Country: Denmark

Re: Binarization

Post by mera461 » 24 Jul 2015, 04:34

A basic description of different binarization algorithms: https://docs.google.com/presentation/d/ ... ide=id.i39. Nothing new, but gives a good overview.

cday
Posts: 243
Joined: 19 Mar 2013, 14:55
Number of books owned: 0
Country: UK

Re: Binarization

Post by cday » 25 Jul 2015, 07:29

Interested to see that there are methods optimised for uneven illumination, as that seems particularly relevant for processing camera images.

mera461
Posts: 7
Joined: 27 Dec 2013, 07:08
Number of books owned: 0
Country: Denmark

Re: Binarization

Post by mera461 » 28 Jul 2015, 15:31

An online algorithm "Efficient Multiscale Sauvola's Binarization": https://olena.lrde.epita.fr/demos/sauvola_ms.php.

All the source: https://www.lrde.epita.fr/wiki/Olena/Download, and specifically the source code for various binarization algorithms: http://git.lrde.epita.fr/?p=olena.git;a ... on;hb=HEAD

Frank

rkomar
Posts: 87
Joined: 12 May 2013, 16:36
E-book readers owned: PRS-505, PocketBook 902, PRS-T1, PocketBook 623, PocketBook 840
Number of books owned: 3000
Country: Canada

Re: Binarization

Post by rkomar » 29 Jul 2015, 14:14

I like the results I'm getting with the binarizewolfjolion program, available from Christian Wolf's website: http://liris.cnrs.fr/christian.wolf/software/binarize/. The latest versions use opencv for image manipulation. I'm not sure if it builds under cygwin; I only run it on my linux machine.

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