[sane-devel] Re: Unpaper 1.0.1 problem

[Janusz S. Bień]

On Tue, 21 Jun 2005  Jens Gulden <mail@jensgulden.de> wrote:

> Janusz S. Bien schrieb:
> > The original scans converted to DjVu
> 
> DjVu looks interesting (http://www.djvuzone.org/).
> Thanks for that hint, I didn't know it before.
> 
> > Although the processing improved the images in some respects, in
> > general the result seems to me less readable then the
> > original.
> 
> The dirty artefacts around letters are strange. Do you think they
> originate from unpaper's processing?

My wild guess is that unpaper was confused and treated parts of
background as belonging to letters.

> I placed an unprocessed page from your djvu-file to
> 
> http://user.cs.tu-berlin.de/~jgulden/unpaper/archive/20050621JanuszBien/03.pbm
> 
> and processed it with
> 
> unpaper -vv --layout single --mask-scan-threshold 0.4
> --black-threshold 0.3 --border 0,100,0,0 03.pbm 03up.pbm
> 
> The resulting file is
> 
> http://user.cs.tu-berlin.de/~jgulden/unpaper/archive/20050621JanuszBien/03up.pbm

Thanks.

> 
> Do you get the same result on your system from the same unpaper run?

I will resume my experiments after the return from holidays, i.e. in
the end of July.

Thanks once again for your help.

Best regards

Janusz

-- 
                     ,   
dr hab. Janusz S. Bien, prof. UW -  Uniwersytet Warszawski (Katedra Lingwistyki Formalnej)
Prof. Janusz S. Bien - Warsaw Uniwersity (Chair of Formal Linguistics)
jsbien@mimuw.edu.pl, jsbien@uw.edu.pl, http://www.mimuw.edu.pl/~jsbien/, http://www.klf.uw.edu.pl