[ITK-users] Minimum Distance to multiple connected regions

[Richard Beare]

I'd also check out the labelerodedilate module (available via the Remote
module system in the new versions of ITK). I've found that using watershed
to create a label-based tessellation can be a problem as the distances get
larger. If you use the label dilate facilities you would use a large
dilation and then use the resulting label image to mask a distance
transform. I also have a vague memory that the Maurer distance transform
filter returns some form of tesselation image, which may be useful

On Tue, Sep 29, 2015 at 9:55 PM, Bradley Lowekamp <blowekamp at mail.nih.gov>
wrote:

> Hello,
>
> I would look into the MorphologicalWatershedFromMarkersImageFilter [1].
>
> Brad
>
> [1]
> http://www.itk.org/Doxygen/html/classitk_1_1MorphologicalWatershedFromMarkersImageFilter.html
>
> On Sep 29, 2015, at 4:57 AM, marco giordano <marco.giord at gmail.com> wrote:
>
> > Hi there ITK community ,
> >
> > I am working on a task to calculate the minimum distance to multiple
> regions of an organ in 3D. Basically I have an image containing 20
> connected regions indicated by integers from 1 to 20.
> > My task is to assign to each voxel in the 3D volume, the label (i.e. the
> integer) corresponding to the closest region to that voxel. I have checked
> the Danielsson filter and it seems suitable to my task, however I tried it
> and it did not really work. To my understanding it assumes that the regions
> are disconnected and are indicated by "one's'" (page 127 of ITK manual 4.8)
> so it is not suitable for connected regions. Maybe someone has a better
> solution to solve my task?
> >
> > One solution that came to my mind is run the Danielsson filter on each
> region separately and then search for the minimum distance for each pixel
> and fetch the corresponding label.
> > I wrote some code (see attachment) but I get a crash when I try to
> access the result of the Danielsson filter with an iterator. I admit that I
> do not have much experience so it might be some syntax errors in coding or
> in handling the ITK objects etc.
> >
> > Any help is appreciated.
> >
> > Regards,
> > Marco
> >
> > <ComputeMinDistanceLabels.cpp>_____________________________________
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