[vtkusers] How to peel the skin from a non-convex object

[Julien Lamy]

Le 31/12/2011 17:39, Dieter Menne a écrit :
> Dear VTK-Users,
> 
> we have MRI Data from the stomach, which is a non-convex object in most
> case. For an example, see
> 
> http://www.menne-biomed.de/uni/stom3d.png
> 
> I am looking for an operations that peels the surface, i.e. removes about 2
> voxel-units from the outside in an operation similar to peeling a ginger
> root with many branches. My simplified first attempt used a triangulation
> followed by a shrink to the centroid, followed by removal of all points that
> are not in the shrunken volume.
> 
> This works well for the convex center, but fails for the tails. 
> 
> Can someone point me to the operation in the VTK toolkit that shrinks
> locally relative to the normal?

Hi Dieter,
The erosion filter (vtkImageContinuousErode3D) in VTK might do the
trick. If not, have a look at the different morphological image filters
in ITK.

HTH,
-- 
Julien