[Insight-users] Applying ImageToHistogramFilter to a specified region

[David Doria]

I just learned how to use SetRequestedRegion, but this concept only works
for filters that output an image. What is the best way to compute the
histogram of pixels in a certain region of an image? Of course using
a RegionOfInterestImageFilter before the ImageToHistogramFilter works fine,
but if I have to do this on millions of image patches it is quite slow.

Thanks,

David
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