[Insight-users] Question about generating and composing deformation fields

[Tom Vercauteren]

Hi Anja,

The required components for you application can be found in elastix and ITK:
http://elastix.isi.uu.nl/doxygen/a00157.html
http://elastix.isi.uu.nl/doxygen/a00002.html
http://www.itk.org/Doxygen/html/classitk_1_1TransformToDeformationFieldSource.html

Another approach would be to rely on
http://www.itk.org/Doxygen/html/classitk_1_1TransformToDeformationFieldSource.html
https://gforge.inria.fr/scm/viewvc.php/trunk/Registration/itkDisplacementFieldCompositionFilter.h?view=markup&root=ttk

Hope this helps,
Tom

On Fri, Aug 27, 2010 at 00:21, Anja Ende <anja.ende at googlemail.com> wrote:
> Hello everyone,
>
> I have a series of affine and non-rigid transformations and what I
> would like to do is create one single deformation field by combining
> these deformations and then use this final deformation field to
> resample my image.
>
> So I need to do two different compositions (I am not sure if I should
> compose or add these deformation fields. The formulation of
> composition is not completely clear to me as well).
>
> 1: I have an affine transformation and a non-rigid transformation. So,
> given an initial image, how can I create a deformation field that
> encapsulates these two transformations.
> 2: I have a non-rigid transformation followed by an affine
> transformation. Again, I would like to create a deformation field that
> encapsulates them.
>
> I would be very grateful if anyone could point out how I might achieve
> this in ITK. Also, maybe more experienced people doing medical image
> registration could share some information on how deformation foelds
> are combined (addition vs composition)
>
> Many thanks for any help you can give me,
>
> Anja
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