[vtkusers] vtkImageDifference

[Bernhard Mayrhofer]

Hello!

I´m trying to calulate the normal correlation coefficient between two 
arrays. The classical formula with sums is very slow. I flound 
vtkImageDifference, and i´m interessted, how the error is calculated?
Are there other possible waysm or is there even a method coorelation 
coefficient in vtk. i searched long time but i can´t find one.

Thanks a lot
Bernie

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