[ITK-users] [ITK] ImageI iterators same walk order simultaneously

[Timothee Evain]

Hi Javier,

You can use iterators to do so without problems, given that you ensure that:
- The two images are in the same reference frame (i.e. axes represent the same directions in both).
- The ImageRegions to parse are identical .
Otherwise you will lose the correpondence between the images.

HTH,

Tim

----- Mail original -----
De: "Javier Juan Albarracín" <javij1 at gmail.com>
À: insight-users at itk.org
Envoyé: Dimanche 19 Juin 2016 01:59:34
Objet: [ITK] [ITK-users] ImageI iterators same walk order simultaneously


Hello,

I want to traverse an image that points to an intra-cranial mask, and 
perform an operation on other image only in the voxels where the 
intra-cranial mask are true. I wrote the following code:

itk::ImageRegionConstIterator<MaskType> iteratorMask(mask, 
mask->GetLargestPossibleRegion());
itk::ImageRegionIterator<MapType> iteratorMap(map, 
map->GetLargestPossibleRegion());

iteratorMask.GoToBegin();
iteratorMap.GoToBegin();
while (!iteratorMask.IsAtEnd())
{
      if (iteratorMask.Get())
      {
          iteratorMap.Set(i);
           ++i;
       }
       ++iteratorMask;
       ++iteratorMap;

}

My question is: can I be sure that, with this implementation both 
iterators point to the same voxel of the image simultaneously? Or should 
I use itk::ImageRegionConstIteratorWithIndex on "mask" and modify "map" 
through the "SetPixel" method? I have read that "SetPixel" and 
"GetPixel" methods are slow and not preferred against iterators. It is 
possible to implement this operation only with iterators?

Thank you very much

Regards.

Javier.


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