[Insight-users] Question on image to image metric implementations

[Markus Weigert]

Hi all,

when using the ImageToImage metrics (for example 
itk::MutualInformationImageToImageMetric), one needs to provide
a spatial transformation, which is used by the metric (for example to compute derivatives).
My question is what about using a deformation field (WarpImageFilter) as "transformation", 
what may also be seen as the more general approach???
One could consider the deformation field as a transformation as well (with much more parameters, of course)
and calculate derivatives with respect to the deformation values (to control for example some registration process).
Is the framework open for this and how expensive would it be to implement such an approach (not only complexity
of calculation but also effort of implementation)?


Thanks for any suggestions,
Markus  
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