[Insight-users] how to fill a holed 3D surface

[Luis Ibanez]

Hi Xabier,

Thanks for posting the image that describe your problem.
It helps a lot to understand the issue.

 From your description it seems that the "surface" is actually
defined in side a 3D image, in the form of a collection of
voxels.  Is that right ?

How thin is the surface ?
1 voxel  ?
2 voxels ?

Is it
26-connected ?
14-connedted ?
or just 6-connected ?

It is unlikely that current ITK filter could extrapolate
that surface, in the way you want it.

You could get close, by using a convex-hull approach,
assuming that the surface itself doesn't have a strong
curvature, but even in that case, the convex-hull will
simply generate a blunt edge, not a pointy edge.

You could consider modifying the Voting filters to run
by counting only voxels that are close to the tangent
plane to the surface. E.g. add a plane estimation and
then count only the votes of voxels in that plane, or
simply weight their votes by their proximity to the plane.

In this way you could grow that pointy edge and keep it
a bit in the surface.


----

That being said,
I would be rather curious of how you generate that
surface in the first place, and whether that method
may be the one where is worth to spen some coffee
searching for improviements.


    Regards,


       Luis


---------------------
BOURGEOIS Loic wrote:
> Hi Xabier,
> 
> In fact, I didn't explain my problem very well : I don't want to fill holes inside objects. (I have put an example attached to this mail to explain what I want to do. dark = object, red = interpolated surface) I want to replace "craters" along the bound of the object by a smoother surface in continuity with the neighbor voxels. All this in 3D.
> 
> Regards,
> 
> Loic
> 
> 
> 
> -----Message d'origine-----
> De : insight-users-bounces at itk.org
> [mailto:insight-users-bounces at itk.org]De la part de Xabier
> Artaechevarria Artieda
> Envoyé : mardi 29 avril 2008 18:04
> À : insight-users at itk.org
> Objet : Re: [Insight-users] how to fill a holed 3D surface
> 
> 
> Hi Loic,
> I do not know what exactly you want to do, but maybe the filters:
> 
> http://www.itk.org/Doxygen34/html/classitk_1_1GrayscaleFillholeImageFilter.html
> 
> and
> 
> http://www.itk.org/Doxygen34/html/classitk_1_1BinaryMorphologicalClosingImageFilter.html
> 
> might be helpful.
> Regards,
> Xabi
> 
> 
> 
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> 
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