[Insight-users] How to get sub voxel values using BSpline

[rashedk]

Hi ITK Experts, 

I would like to compute sub-voxel values using BSpline interpolation. To be
more specific, I am using the DerivativeImageFilter to compute the image
gradient, and would like to compute the gradient at sub-voxel positions. 

I looked in the ITK software guide, but it seems like all interpolation
examples are tied with registration where interpolators are assigned to the
filter using a SetInterpolator function. But I cant do the same with
DerivativeImageFilter.

Thanks in advance, 
Rashed 
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