[Insight-users] Fitting BSplines to Deformation Fields?

[Constantine Zakkaroff]

Hello All.

I'm wondering if there's an easy way of fitting a BSpline (calculating 
the node coefficients) to a dense vector deformation field? For example, 
I have a 3D VDF and I want to represent the transformation it as a 3D 
BSpline?

Or even better, say I have a 4D VDF (3D + time) and I want to represent 
the transformation between time=0 and time=N as a 3D BSpline?

Thanks,
Constantine