[Insight-users] Segmentation-Surface Reconstruction- Questions

[Bill Lorensen]

You can use itk::AntiAliasBinaryImageFilter . It creates a levelset from a
binary mask. You can use vtkMarchingCubes to extract the 0 level set.

Bill


On 6/23/06, Karthik Krishnan <Karthik.Krishnan at kitware.com> wrote:
>
> If your purpose is to produce a smooth mesh / contour from a binary
> segmentation, you could in principle do this both on the image domain
> and on the mesh domain.
>
> 1. Apply the Anti-alias filter in ITK and then run marching cubes on
> it.  The anti-aliasing filter will smooth jagged edges, by introducing
> some continuity. So the output of your marching cubes won't look jagged.
>
> 2. Do some polygon anti-aliasing on the mesh. You will have to go to VTK
> for that.
>
> HTH
> -karthik
>
> platon galatis wrote:
>
> > Hello,
> >
> > Im  a mechanical engineer and my diploma thesis subject is about
> > segmenting a series of human 2D ct scans, in order to produce a 3D
> > surface mesh suitable to be exported to CAD-CAE systems for FEA.
> >
> > Im trying to conclude on my strategy but i have some questions.
> >
> > I've read a lot about Marching cubes,Marching tetrahedra and their
> > variations. All these algorithms speak for values at nodes of a
> > regular 3D grid. But what if the input images are binary (black/white)
> > as a result of a segmentation algorithm from itk?
> >
> > If i said that out = 1 ,in=-1 and the boundary=0 then the linear
> > interpolation would always give the middle of the intersected  edge.
> > Am i mising something here?
> >
> > Can i get results giving as input a thresholded set and by specifying
> > the isocontour value as the mean value of a set of  points sampled
> > from the desired boundary (skipping segmentation)?
> >
> > I've found the Deformable models method interesting . Would it be a
> > good practice to produce a binary 3D image with some segmentation
> > method, pass it to the itk::BinaryMask3DMeshSource for a rough initial
> > mesh and then use the itk::DeformableMeshFilter to refine it?
> >
> >
> >
> > Thank you for reading this.
> >
> > Any help would be appreciated.
> >
> > Sincerely,
> >
> > Plato Galatis.
> >
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