[Insight-users] correlation coefficient histogram metric on 2 images

[Matt McCormick]

Zoltan Seress <seress.zoltan at ...> writes:

> 
> 
> Hi all,
> 
> My problem is very simple. I have 2 images (same size) and I want to compute 
the correlation coefficient between them. Can
itkCorrelationCoefficientHistogramImageToImageMetric class be used for this some
way? I do not need any registration process, only the simple CC value between
the images. Or does this class need an optimizer to work correctly?
> 
> Thanks in advance!-- Zoli
> 

Hi Zoli,

The itkCorrelationCoefficientHistogramImageToImageMetric is designed to be
capable of calculating the CC when images do not overlap and interpolation may
be required.  You could calculate the CC with a combination of
itkStatisticsImageFilter, then an ImageRegionIterator to subtract off the means,
multiply, divide by sigmas, and sum.