[Insight-users] Registration with a deformation field

[Merrem, Andreas]

Hello,

I tried to implement a registration algorithm in the itk framework with
a deformation field as a transform for a 256X256 2D image. 
This field should be displacement vector for each pixel using all image
pixels as grid points (i.e. 2*number of pixels degrees of freedom) and a
gradient descent optimizer. It worked with the B-spline transform class,
but it was really slow (2 minutes per optimizer iteration). I'm not sure
if that was because B-spline class somehow makes the program compute
splines for interpolation although there are no points in between the
grid points. Does anyone know a faster way of implementing a deformation
field?

 Thank you for your help,

Andreas
     
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