[Insight-users] More general version of HConcaveImageFilter?

[Taylor Braun-Jones]

Hi Dan,

Thanks, for the reply.

I came across the top-hat filter in ITK, but it seems to lack the "height"
control that HConcaveImageFilter provides. Or am I missing something? It
seems like I would need a new filter - something like
HBlackTopHatImageFilter - for what I'm trying to do.

Taylor

On Mon, Feb 18, 2013 at 6:32 PM, Dan Mueller <dan.muel at gmail.com> wrote:

> 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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