[Insight-developers] BSplineDeformableTransform without support-Parameters

[Henning Meyer]

Hello,

what would be the easiest way to use BSplineDeformableTransform for
flexible Registration without having useless parameters from the
support-mesh-points outside the volume. As far as I understand it
would be good to keep them as zero.
Because using this transform with 3 * 5^3 leads to 375 parameters,
which is a huge difference to 3 * (5+3)^3 = 1536 parameters.
I already tried to replace the transformPoint function by a simple
Interpolation of the warpimages. But I have not enough knowledge to
create the right Jacobian this way.
The other idea was to adapt GetParameters, SetParameters and
GetNumberOfParameters to fake o lower number of parameters. But
somehow it did not work.....

What should be in the Jacobian, when I just have a grid without an
support outside the volume?

Thanks,

Henning