CGAL users discussion list

[Andrea Cortis <>]

Dear Laurent, thanks for your help.

I think I can figure out a way to get that information from the
segmented image ... how do I need to encode that information?

Andrea



On Tue, May 15, 2012 at 8:17 AM, Laurent Rineau (GeometryFactory)
<>
 wrote:
> Le lundi 14 mai 2012 11:29:01 Andrea Cortis a écrit :
>> Dear All,
>>
>> I am new to CGAL and seeking help on how to generate a 3d mesh from a
>> segmented image.
>> So far I have been able to run the examples at
>>
>> [1]
>> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Mesh_3/Chapter_main.
>> html#Subsection_50.3.3
>>
>> [2]
>> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Surface_mesher/Chapt
>> er_main.html
>>
>> I have also run some examples on my own images, but I am finding some
>> problems with segmented images that consist of isolated regions. In
>> particular, I have noticed that, generally speaking (1) only some of
>> the isolated regions are correctly spotted, and (2) which regions are
>> spotted depends on the center and radius of the ball in link [2] and,
>> for the same radius and center, it depends on the particular
>> random_seed number.
>>
>> I have uploaded a "test.inr" file at this location:
>>
>> http://www.tempfiles.net/download/201205/243508/test.html
>>
>> (Please let me know if you are able to download it correctly)
>>
>>
>>
>> I would greatly appreciate any help on this problem. Thanks in advance,
>
> Do you have a way to know in advance how many isolated regions you have, do
> you have a way to find an rough enclosing sphere for each (with the 
> constraint
> that the center of the sphere is inside the region)? In that case I might
> help.
>
> The issue is the initialization step of the meshing process. It uses random
> ray queries, issuing from the center of the sphere you give. To find out all
> regions, one needs to run that process for each region.
>
> --
> Laurent Rineau, PhD
> R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
> Release Manager of the CGAL Project       http://www.cgal.org/
>
>
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