On Fri, Feb 17, 2012 at 5:19 PM, Vikash Gupta <vikash.gupta at inria.fr> wrote: > > There you go > http://www.itk.org/Doxygen/html/itkMutualInformationImageToImageMetric_8h_source.html The .hxx file contains the implementation of the template functions. #include "itkMutualInformationImageToImageMetric.hxx" John