[Insight-users] Parabolic dilatation correct radius

[Simon ESNEAULT]

Hi,

Thanks a lot Richard, that was my mistake (foreground pixel value input
of 255 instead of 1). Now it behaves correctly.

The parabolic Erosion and Dilatation are the fastest here for binary images
as long as the radius is greater than 3. The distance transform perform
quite well also, sometimes even better than the Maurer implementation. This
should be integrated to ITK !

Thanks for your good work and bright explanations

-Simon

On Fri, Dec 16, 2011 at 00:51, Richard Beare <richard.beare at gmail.com>wrote:

> Hi,
> I haven't run anything, but I've had a look at your image and the test
> program. The parabolic classes assume a binary input image with values
> 0 or 1, not 0 or 255. Scaling the input will scale the size of the
> radius by the square root of the intensity scale. This is the basis of
> the spatially variant operations I mentioned in the earlier message.
> Also, be sure to update with the version from github, as there have
> been minor changes to the padding for openings and closings and there
> is support for ITK4.
>
> On Fri, Dec 16, 2011 at 8:23 AM, Simon ESNEAULT
> <simon.esneault at gmail.com> wrote:
> > Hi All,
> >
> > Following that conversation on the mailing list :
> > http://www.itk.org/pipermail/insight-users/2009-June/030778.html
> > I was convinced that the fastest dilatation filter implementation in ITK
> is
> > the multi-threaded parabolic Morphology
> > (http://mima2.jouy.inra.fr/darcs/contrib-itk/parabolicMorphology/).
> > And my local test confirmed it all.
> >
> > But I'm having trouble to set the correct radius in the class
> > itk::BinaryDilateParaImageFilter. With the same radius, the result
> > highly differs between BinaryDilateParaImageFilter and
> > the ground-truth BinaryDilateImageFilter. What is the correct radius that
> > should be set in the Parabolic filter in order to get the same result
> than
> > the classical binary dilate ?
> >
> > Here -> http://esneault.free.fr/itk/TestParabolic.zip <- is a minimal
> c++
> > project and a dataset that reproduce the problem
> >
> > Step to build and run the project :
> > uncompress
> > cmake .
> > make
> > ./TestParabolic
> >
> > And you should have some result file written. etc
> >
> > Thanks
> >
> > Simon
> >
> > --
> > ------------------------------------------------------------------
> > Simon Esneault
> > 13 rue Vasselot
> > 35000 Rennes, France
> > Mail : simon.esneault at gmail.com
> > ------------------------------------------------------------------
> >
> >
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Simon Esneault
13 rue Vasselot
35000 Rennes, France
Tel : 06 64 61 30 94
Mail : simon.esneault at gmail.com
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