[Insight-users] Irregularly sampled deformation field

[Luis Ibanez]

Hi Emmanuel,

This sounds very useful.

I would think that an irregularly sampled deformation field
can be represented with the KernelTransforms

http://www.itk.org/Doxygen310/html/classitk_1_1KernelTransform.html

by setting Source and Traget landmarks that are related
by the desired deformation vectors.


Note that this transform can be connected directly to
the itkResampleImageFilter.



    Regards,


          Luis


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On Wed, Jul 28, 2010 at 12:53 PM, Emmanuel Christophe <
emmanuel.christophe at gmail.com> wrote:

> Hi all,
>
> We are using the TransformToDeformationFieldSource with the
> WarpImageFilter to apply a deformation to an image. The advantage is
> that the WarpImageFilter is able to interpolate the deformation which
> enable us to use a subsampled deformation field (speeding up the
> computation significantly).
>
> We would like to be able to adapt the sampling according to some
> specific criteria. For this, we would need an irregularly sampled
> deformation field and the corresponding image warping filter. We don't
> think that there is anything like that in ITK (yet). We are
> considering implementing that, but we would like to have suggestions
> concerning the best data structure to use to represent this irregular
> grid: PointSet, Mesh, anything else?
>
> Thanks,
> Emmanuel and Julien
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