[vtkusers] vtkImageErode3D

[elena bresciani]

I'm getting started with vtk and I'm still unable to solve a lot of
problems.

I'm trying to apply the vtk filter vtkImageDilateErode3D to a CT image but I
can't obtain the result I'm looking for.
In fact I expect the result to be a at least slightly different image but
the output is instead an image identical to the one given as input (I even
checked subtracting the two images with vtkImageMathematics and after the
operation there's really nothing left!).
I don't understand if the problem is in the setting of the Erode and Dilate
values and in the kernel size or maybe in the function of the filter itself,
i.e. I expect that the output image has something less compared to the
original one after erosion and dilatation (what has been eroded "to the
ground" canot be dilated back - is this correct?)

Thank you in advance
Sorry for the bad english

Elena
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