[Insight-users] "In place" filtering

[David Doria]

I don't believe the following will work. The idea is to pass an image to a
function and smooth it "in place".

ImageType::Pointer image = get image from somewhere...
SmoothImage(image);

where:

void SmoothImage(ImageType::Pointer image)
{
 // Create and setup a mean filter
 typedef itk::MeanImageFilter<
  ImageType, ImageType >  filterType;

  filterType::Pointer meanFilter = filterType::New();
  meanFilter->SetInput(image);
  meanFilter->Update();

  image = meanFilter->GetOutput();
}

Of course you can do this:

ImageType::Pointer image = get image from somewhere...
ImageType::Pointer output = ImageType::Pointer::New();
SmoothImage(image, output);

void SmoothImage(ImageType::Pointer image, ImageType::Pointer output)
{
 // Create and setup a mean filter
 typedef itk::MeanImageFilter<
  ImageType, ImageType >  filterType;

  filterType::Pointer meanFilter = filterType::New();
  meanFilter->SetInput(image);
  meanFilter->Update();

  output = meanFilter->GetOutput();
}

but that seems a bit awkward.

Is there a pattern that makes sense for this "in place filtering" style
function?

Thanks,

David
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