[Insight-users] Correspondance between "water shed" and "fill holes" filter

[Luis Ibanez]

Hi Lynx,

You should take a look at the following paper
in the Insight Journal:

http://www.insight-journal.org/browse/publication/92
"The watershed transform in ITK - discussion and new developments"
Beare R., Lehmann G.


and the following filters:

itkMorphologicalWatershedFromMarkersImageFilter.h
itkMorphologicalWatershedFromMarkersImageFilter.txx
itkMorphologicalWatershedImageFilter.h
itkMorphologicalWatershedImageFilter.txx

that you will find in the directory:

          Insight/Code/Review



    Regards,


             Luis


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On Tue, Feb 16, 2010 at 8:45 AM,  <lynx.abraxas at freenet.de> wrote:
> Hello!
>
>
> I'm  looking  for  a  filter  who's result is that of a water shed filter that
> would stop filling basins as soon as a water shed  would  be  introduced.  The
> result  would  be  a  label  for each marker (eg. local minimum) but the label
> would only be as big as the "natural" basin. So the  labels  would  only  just
> touch each other.
> From  the  description  of the fill-holes-filter I'm not sure if that is doing
> what I'm looking for. I tried:
> HMinimaImageFilter(float-image)
> GrayscaleFillholeImageFilterr(Hminima-result)
> SubtractImageFilter(Hminima-result,fillholes-result)
> BinaryThresholdImageFilter(Substract-result) #bg==0 fg everything except 0
> ConnectedComponentImageFilter(threshold-result)
>
> But the result is not as expected.
> For one I wonder how I can achieve a threshold as fg is everything except 0.
> Second the subtraction does not yield 0 any where. Why that? Is this a rouding
> error problem?
>
> Is there a better way to achieve this goal?
>
> Many thanks for any help or hints
> Lynx
>
>
>
>
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