[Insight-users] About the up-sampling of deformation field from low resolution to high in Examples/DeformableRegistration6

[Mengda Wu]

Hi all,

   I have a question about conversion of deformation field from low
resolution to high in Examples/DeformableRegistration6. I do not understand
why we need both ResampleImageFilter and BSplineDecompositionImageFilter. I
think we only need to up sample the deformation field (per dimension)
using ResampleImageFilter with BSplineResampleImageFunction.

  Then, why is the output of ResampleImageFilter fed into
BSplineDecompositionImageFilter and then put into the parameters? What does
BSplineDecompositionImageFilter do?
I cannot get this from the document of BSplineDecompositionImageFilter.

Thanks,
Mengda
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