[Insight-users] Are these metrics based on "correlation ratio"?

[pinpress]

Hi,

I am in need to perform registration in ITK using correlation ratio as image
similarity measure (Its reference can be found here: 
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.20.1164&rep=rep1&type=pdf 
). I found from ITK classes the following two:

CorrelationCoefficientHistogramImageToImageMetric

NormalizedCorrelationImageToImageMetric

My question is, do they implement the "correlation ratio" as similarity
measure? What are their differences? Thanks very much. 
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