[Insight-users] How to assign a new label value to Label objects in a LabelMap

[Neil Panjwani]

If you are trying to relabel your image based on a specific shape attribute,
see:

http://www.itk.org/Doxygen318/html/classitk_1_1ShapeRelabelImageFilter.html

On Fri, May 6, 2011 at 5:40 AM, Pei Dong <peidong1030 at gmail.com> wrote:

> Hello,
>
> It concerned to itk::LabelMap, itk::ShapeLabelObject,
> itk::LabelMapToLabelImageFilter
>
> I have a question about how to change the label value of label object in a
> label map and convert into an new label image.
>
> I try to assign each label object in a label map with a new label value by
> using "labelObj->SetLabel(new_value)". However, after I converted the label
> Map into an label image using "itk::LabelMapToLabelImageFilter" , the label
> value of the coverted image doesn't change to new_value.
>
> The code looks like below:
> // read and convert image into a labelmap
> ...
> LabelMapType::Pointer labelMap = converter->GetOutput();
> LabelMapType::LabelObjectContainerType::iterator it;
> LabelMapType::LabelObjectContainerType & labelObjectContainer =
> labelMap->GetLabelObjectContainer();
> for( it = labelObjectContainer.begin(),it != labelObjectContainer.end();
> it++)
> {
>    ...
>    new_value = image2->GetPixel(index);
> //!!!try to change the label here!!!
>    it->second->SetLabel(new_value);
> }
>
> typedef itk::LabelMapToLabelImageFilter< LabelMapType,
> LacunaDistanceImageType > M2IFilterType;
>
>   M2IFilterType::Pointer m2i = M2IFilterType::New();
>      m2i->SetInput(labelMap);//The labels remain the same?!
>      m2i->Update();
> //save image...
>      ...
>      writer->GetInput(m2i->GetOutput());
>
> Thanks in advance!
>
> Sincerely,
> Pei DONG
>
>
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