[Insight-users] Is there an image filter that can compute an mean image (mean pixel values) of several images with different sizes?

[Seth Gilchrist]

Hi Haiyong,
itk::ImageRegion has a crop function that will return the intersecting area
of two regions:

itk::ImageRegion regionOne = imageOne->GetLargestPossibleRegion();
itk::ImageRegion regionTwo = imageTwo->GetLargestPossibleRegion();

regionOne.Crop(regionTwo);

If you feed the regions progressively into this pseudo-code you will end up
with the common region.  Use image iterators to access this common region
and create a new image of the average.

I also found this
http://www.vtk.org/Wiki/ITK/Examples/SimpleOperations/RegionOverlap
which may help.

Cheer,
Seth
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