[Insight-users] TransformPoint with non-invertible transform

[Karthik Krishnan]

It is the points on the moving image that are transformed onto the fixed
image. Perhaps its an issue of terminology. Are you sure you need the
inverse ?

One can get the approximate the EBS inverse by reversing the source and
target landmarks.

There isn't a straightforward way to invert the BSpline. Take a look at
itk::InverseDeformationFieldImageFitler . It samples the grid using a kernel
transform and approximates the inverse via one of the 5 kernel transforms.

--
karthik

On Tue, Jun 1, 2010 at 9:38 PM, Charlotte Curtis <c.f.curtis at gmail.com>wrote:

> Hi all,
>
> I'm transforming an image using an elasticbodysplinekerneltransform,
> followed by a bsplinedeformabletransform.  I've got a set of points
> defined on the moving image that I would like to transform as well.
> Looking at the code (and the behaviour when I try to GetInverse()), it
> seems that the inverse is not implemented (or my transform is not
> invertible).
>
> How can I transform my point set so that it matches the transformed
> moving image?  Thanks,
>
> Charlotte
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