[Insight-users] itk::ChangeLabelImageFilter

[Henning Meyer]

Maybe thats not needed. I think ChangeLabelImageFilter is ok.
I created my ChangeMap by trying to loop over all labels
LabelStatisticsImageFilter returned.
But I did it wrong.

Confusing thing is, there is a
LabelStatisticsImageFilter::GetNumberOfObjects and
LabelStatisticsImageFilter::GetNumberOfLabels - both seem to do the
same.
But there is no way of finding out, what the actual labels are.
So I have to use MinimumMaximumImageCalculator::GetMinimum() and
GetMaximum() to get the range to iterate, which might be very stupid
(labelPixels are long int - so there can be a huge range).

Henning


2006/6/8, Miller, James V (GE, Research) <millerjv at crd.ge.com>:
>
> I think Dirk Padfield or Tim Kelliher wrote the ChangeLabelImageFilter.  I'll have one them take
> a look at the SetChangeMap() issue.
>
> Jim
>
> -----Original Message-----
> From: insight-users-bounces+millerjv=crd.ge.com at itk.org
> [mailto:insight-users-bounces+millerjv=crd.ge.com at itk.org]On Behalf Of
> Henning Meyer
> Sent: Wednesday, June 07, 2006 10:15 AM
> To: Gaetan Lehmann
> Cc: insight-users at itk.org
> Subject: Re: [Insight-users] itk::ChangeLabelImageFilter
>
>
> I see. But what do I do wrong:
>
> This works:
>
>         ChangeLabelFilterType::ChangeMapType changeMap;
> // some code to set the map
>         LabeledImageIteratorType watershedIt( watershedImage,
> watershedImage->GetBufferedRegion() );
>         for(watershedIt.GoToBegin(); !watershedIt.IsAtEnd(); ++watershedIt)
>                 watershedIt.Set( changeMap[ watershedIt.Get() ] );
>
> But this does not:
>         ChangeLabelFilterType::Pointer labelChanger = ChangeLabelFilterType::New();
>         labelChanger->SetInput( watershedImage );
>         labelChanger->SetChangeMap( changeMap );
>         labelChanger->Update();
>         LabeledImageType::Pointer labelChangedImage = labelChanger->GetOutput();
>
> Thanks for your help!
>
> Henning
>
>
> 2006/6/7, Gaetan Lehmann <gaetan.lehmann at jouy.inra.fr>:
> >
> > Hi,
> >
> > The ChangeLabelImageFilter works without problem (for me).
> > Most of the code is in the functor declared in the header: this filter use
> > the UnaryFunctorImageFilter to simplify its implementation.
> >
> > Gaetan
> >
> >
> > On Wed, 07 Jun 2006 15:36:52 +0200, Henning Meyer <tutmann at gmail.com>
> > wrote:
> >
> > > Hello,
> > >
> > > maybe a stupid question:
> > > Does itk::ChangeLabelImageFilter (ITK 2.6) do anything usefull at all?
> > > The source just looks like an empty template generated filter.
> > >
> > > Did I do something wrong?
> > >
> > > Thanks for your help!
> > >
> > > Henning
> > > _______________________________________________
> > > Insight-users mailing list
> > > Insight-users at itk.org
> > > http://www.itk.org/mailman/listinfo/insight-users
> >
> >
> >
> > --
> > 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
> >
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users
>