[Insight-users] Minimum/Maximum Image Filters

[Ryan Smith]

Hi Luis-

"FFT crosscorrelation if you were looking for a face in a group photograph"

Is there any example code available for determining the location of a
predefined template pattern image in another image using the aforementioned
technique? If not, can you recommend some filters for me to check out
myself? Thanks-

-Ryan

On Fri, Dec 10, 2010 at 7:12 AM, Luis Ibanez <luis.ibanez at kitware.com>wrote:

> Gaetan,
>
> Thanks for the clarification.
>
> An example has now been added for the
> ValuedRegionalMaximaImageFilter:
>
>
> http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ValuedRegionalMaximaImageFilter
>
>
>
>       Luis
>
>
> ------------------------------------------------
> On Fri, Dec 10, 2010 at 7:49 AM, Gaëtan Lehmann
> <gaetan.lehmann at jouy.inra.fr> wrote:
> >
> > Le 10 déc. 10 à 12:59, Luis Ibanez a écrit :
> >
> >> Hi David,
> >>
> >> Thanks for posting the example.
> >>
> >> I just modified the CreateImage() method
> >> to better illustrate what this filter does.
> >>
> >>
> >>
> http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/RegionalMaximaImageFilter
> >>
> >> It essentially find the local maxima in the
> >> input image and mark them in the output
> >> image.  So, the output image is a binary
> >> image that is zero everywhere, except at
> >> the pixels that are local intensity maxima
> >> in the input image.
> >>
> >> This is the filter that you may want to
> >> run on the output of an FFT crosscorrelation
> >> if you were looking for a face in a group
> >> photograph, or the if you were analyzing
> >> the parameter space of an Hough transform.
> >>
> >>
> >> I'm not sure that this is what Robert was
> >> asking for...   from his email, it looks like
> >> he wanted the output pixel to have the
> >> value of the input pixel.   On the bright side
> >> that probably can be done with a minor
> >> retouch of the filter source code.
> >
> > Hi,
> >
> > This is exactly what itk::ValuedRegionalMaximaImageFilter is doing.
> > IIRC, itk::RegionalMaximaImageFilter use the output of
> > itk::ValuedRegionalMaximaImageFilter to produce its output image.
> >
> > Regards,
> >
> > Gaëtan
> >
> >
> >>
> >> but, maybe now that the example is clearer,
> >> it would be easier for Robert to give it a try
> >> and let us know.
> >>
> >>
> >>    Luis
> >>
> >>
> >> -----------------------------------------------
> >> On Thu, Dec 9, 2010 at 11:25 AM, David Doria <daviddoria at gmail.com>
> wrote:
> >>>
> >>> On Thu, Dec 9, 2010 at 11:16 AM, Ryan Smith <ryanleesmith at gmail.com>
> >>> wrote:
> >>>>
> >>>> Hi Robert-
> >>>>
> >>>> You might take a look at the itk::RegionalMaximaFilter.
> >>>>
> >>>> Here is a previous response that helped me with a similar task:
> >>>>
> >>>>
> >>>>
> http://public.kitware.com/pipermail/insight-users/2010-September/038088.html
> >>>>
> >>>> Cheers-
> >>>> -Ryan
> >>>
> >>> (small typo:  itk::RegionalMaximaFilter ->
> >>>  itk::RegionalMaximaImageFilter)
> >>>
> >>> I put a shell example here:
> >>>
> >>>
> http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/RegionalMaximaImageFilter
> >>>
> >>> I'm not exactly sure what this filter is supposed to do. If someone
> >>> can modify the CreateImage function so that the resulting filtered
> >>> image demonstrates the point that would be great.
> >>>
> >>> David
> >>> _____________________________________
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> >>>
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> >>>
> >> _____________________________________
> >> Powered by www.kitware.com
> >>
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> >> http://www.kitware.com/opensource/opensource.html
> >>
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> >> http://www.kitware.com/products/protraining.html
> >>
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> >>
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> >
> > --
> > Gaëtan Lehmann
> > Biologie du Développement et de la Reproduction
> > INRA de Jouy-en-Josas (France)
> > tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
> > http://voxel.jouy.inra.fr  http://www.itk.org
> > http://www.mandriva.org  http://www.bepo.fr
> >
> >
>
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