Scan Tailor

[Tulon]

I.e. you want something like
http://www.comp.nus.edu.sg/~tancl/Paper ... p03-lu.pdf
and the follow-up paper
http://en.scientificcommons.org/42257334

In fact my illumination equalization code is already based on that paper. However, this method when applied as is, fails in the presence of large pictures. Therefore, I do some preprocessing first. That preprocessing makes an assumption that gray levels along a vertical scan line don't form cavities. That is, it can be lighter in the middle, but it can't be darker. If it is, it's assumed to be a picture. That's what is happening in Antoha-spb's case.
Thinking about it today, I came up with another idea for preprocessing, which wouldn't have this limitation. I'll try it in the next days.

[aku]

I.e. you want something like
http://www.comp.nus.edu.sg/~tancl/Paper ... p03-lu.pdf
and the follow-up paper
http://en.scientificcommons.org/42257334

In fact my illumination equalization code is already based on that paper.

Ah. Good to know. I should really get and install ST. Well, in a few days I am back in Vancouver in my regular environs and should be able to.

However, this method when applied as is, fails in the presence of large pictures. Therefore, I do some preprocessing first. That preprocessing makes an assumption that gray levels along a vertical scan line don't form cavities. That is, it can be lighter in the middle, but it can't be darker. If it is, it's assumed to be a picture. That's what is happening in Antoha-spb's case.

I see.

Thinking about it today, I came up with another idea for preprocessing, which wouldn't have this limitation. I'll try it in the next days.

[monday2000]

Antoha-spb
Use Book Restorer 4.2.1 from here http://www.djvu-soft.narod.ru/soft/basic.htm the way described here http://www.djvu-soft.narod.ru/scan/strange_lighted.htm .

Here is your scan processed this way (one-click fully automatic procedure):

Fig.1. The scan after lighting correction in Book Restorer 4.2.1



Fig.2. The scan from Fig.1 after binarization in Book Restorer 4.2.1

But prior to binarizing the scan from Fig.1 it would be better first to remove background on it - in ScanKromsator. That would probably improve the binarization result. But I don't get clearly from your scan if its poor background is the result of paper degradation or simply JPEG artifacts (surely absent on the primary TIF scan).

[Misty]

I think that Book Restorer is commercial software (this is the software by i2S, right?), so I don't think it's appropriate to link to a site for downloading it.

[monday2000]

Misty
Not more inappropriate than to shoot commercial books with Reetz's "photo-scanner".

[Antoha-spb]

Thanks Monday2000 and Aku. I will try alternative SW to process my scans. I believe ScanTailor once gets upgraded with such functionality (i actually got used to this simple and effective app.)

Misty
Not more inappropriate than to shoot commercial books with Reetz's "photo-scanner".

Hmmm...too straightforward, but true

A.
PS maybe for the 'safety reasons' it's worth to address official software developers sites. Everyone who needs a 'cure' will easily find it him-/herself elsewhere at his/her own risk.

[Misty]

No, not true at all; format-shifting of a book a person owns is perfectly legal (in many countries) as long as it's not being distributed. And many of us are only scanning out-of-copyright materials.

[Antoha-spb]

No, not true at all; format-shifting of a book a person owns is perfectly legal (in many countries) as long as it's not being distributed.

So far I've scanned only two recent copyrighted books, both are myself (family) -owned and solely for the personal use. The copyright note inside both books, however, reads that no copying is allowed for any purpose and in any form, partial or complete, digital or hard.

[monday2000]

Antoha-spb

I believe ScanTailor once gets upgraded with such functionality (i actually got used to this simple and effective app.)

I hope so too. It is very much required. And not just in Scan Tailor - but generally available as a GPL C code.
Misty
Pensez-vous à vrai dire qu'il a construit un scanner si compliqué simplement pour photographier ces livres personnels et c'est tout?

[monday2000]

daniel_reetz

Even so, I'd still like a super-secret option to turn on "split-pages" propagation for advanced users.

This feature is available in the ScanKromsator program. Besides ScanKromsator unlike Scan Tailor does not force a user to walk every time necessarily through all the stages of the processing .

I always first use ScanKromsator to split pages apart, then load the resulted scans into Scan Tailor (if I want to use it) and process them till the end - but I never process the raw scans only in Scan Tailor - from beginning to the end.