CGAL users discussion list

[Pierre Alliez <>]

hi Luis,

it seems like you are looking for an image vectorizer - such as 
http://vextractor.vextrasoft.qarchive.org/

I have used a trial version and it can export to ASCII format as well.


 a écrit :
> Thanks for your reply. You've  given me an idea to achieve the 
> transformation. Actually I've implemented a background method to segment 
> an input image into a binary image with background and foreground zones. 
> With a method to obtain the line segments which you are talking about, 
> like Hough transform, I will collect them to for the polygon desired by 
> means of the procedure you've described.
>
> Cheers!
> Luis
>
> Quoting Ben Supnik 
> <>:
>
> > Hi,
> >
> > If you have a set of line segments you could insert them all into an
> > arrangement_2, then analyze the arrangement topologically to detect
> > closed regions.  (Or use the arrangement to build a "general polygon
> > set" and let the polygon set code find the polygons for you with some
> > hints.)
> >
> > cheers
> > ben
> >
> >
> >
> >
> >  wrote:
> > > Hi! I'm a new user of the CGAL Library. I'm actually reading different
> > > sections of the Reference Manual and I've a doubt I'd like to check in
> > > this discuss list.
> > >
> > > I want to obtain a polygon from a binary image, resulting from a
> > > segmentation process, such that the foreground of this image establishes
> > > the boundaries of the polygon. Are there any way implemented into the
> > > library to achieve this transformation ? Otherwise ... Could you advise
> > > me a procedure to achieve it?
> > >
> > > Thanks in advance, and sorry for my bad english :P.
> >
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--
Pierre Alliez
INRIA Sophia Antipolis - Mediterranee
Project-team GEOMETRICA
http://www-sop.inria.fr/members/Pierre.Alliez/
Tel: +33 4 92 38 76 77
Fax: +33 4 97 15 53 95