[ITK] Pattern intensity similarity metric

[Andrés Larroza]

I was wondering if the PatternIntensity metric as described in: Weese, J.  
and Buzug, T. M. and Lorenz, C. and Fassnacht, C.,"An Approach to 2D/3D  
Registration of a Vertebra in 2D X-Ray Fluoroscopies with 3D CT Images",  
Proc. CVRMed/MRCAS 1997, volume 1205, 119-128; has already been  
implemented?

Thanks,

Andrés