[Insight-users] More general version of HConcaveImageFilter?

[Dan Mueller]

Hi Taylor,

The HConcaveImageFilter is a type of geodesic morphological image
filter — it does not really have the concept of neighbourhood from a
structuring element. The connectivity (4-connectivity, or
8-connectivity aka fully connected) simply defines how the geodesic
distance is computed (e.g. wave front is propagated to 4-neighbours or
8-neighbours). See [1]: "the h-dome [HConvexImageFilter]
transformation extracts light structures **without involving any size
or shape criterion**. The only parameter (h) is related to the height
of these structures." (emphasis added)

Perhaps you are more interested in a top-hat operation, which does
employ a structuring element. See also [2].
http://www.itk.org/Doxygen/html/classitk_1_1BlackTopHatImageFilter.html
http://www.itk.org/Doxygen/html/classitk_1_1WhiteTopHatImageFilter.html

HTH

Cheers, Dan

[1] http://www.vincent-net.com/luc/papers/93ieeeip_recons.pdf
[2] http://www.vincent-net.com/luc/papers/94mdekker_segm_chapter.pdf

On 19 February 2013 09:08, Taylor Braun-Jones <taylor at braun-jones.org> wrote:
> Hello insight-users,
>
> I'm looking for a filter like itk::HConcaveImageFilter [1] except one that
> allows the neighbors to be defined more generally than just fully connected
> or not. I'd like to be able to define the neighbors using a structuring
> element like itk::FlatStructuringElement::Annulus(...) [2] Does anything
> like this exist?
>
> Thanks,
> Taylor
>
> [1] http://www.itk.org/Doxygen/html/classitk_1_1HConcaveImageFilter.html
> [2]
> http://www.itk.org/Doxygen/html/classitk_1_1FlatStructuringElement.html#a7311c2ea4ce8b46c376b0c97ed5434b2
>
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