[Insight-users] Getting a reference to a pixel from an iterator

[David Doria]

On Mon, Feb 28, 2011 at 9:10 AM, Cory Quammen <cquammen at cs.unc.edu> wrote:

> David,
>
> The Get() method in the iterator makes a copy of the pixel value and
> returns it to the caller. This copy exists in a temporary variable,
> and you are taking the address of that copy (not the original), thus
> the warning. To my knowledge, there is no way to operate directly on
> the pixel value through the Get() method in the iterator.
>
> This should let you do what you are looking to do.
>
> PixelType pixel = imageIterator->Get();
> // modify pixel value
> imageIterator->Set(pixel);
>
> It's an extra line to set the new pixel value, but this is likely less
> error prone than operating on a reference to a pixel value.
>
> Cory
>

Thanks for confirming there is no way to do this. Using Set() won't work for
me - what I was trying to do was:

std::vector<PixelType*> pixels;

itk::ImageRegionIterator<ImageType> imageIterator =
itk::ImageRegionIterator<ImageType>(image, region);
  while(!imageIterator.IsAtEnd())
    {
    if(someCondition(pixel))
      pixels.push_back(&pixel);
    }
ChangePixels(pixels);

How do you think a proposition of adding a GetAddress() function to the
iterators would go?

David
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