[Insight-users] question on itkWarpImageFilter

[David Doria]

On Mon, May 23, 2011 at 4:06 PM, Gao, Yi <gaoyi.cn at gmail.com> wrote:
> Dear group,
>
> I'm a little confused about the itkWarpImageFilter....
>
> 1. I understand that in computing the deformed (output) image, we
> should go through the domain of the *output* image, and inversely
> trace back (according to the deformation vector field) to find the
> intensity in the input image.
>
> 2. However, on page 242 of the software guide, above equation 6.21, we
> see that the deformation vector field (as a vector image) should have
> the same size as the *input* image. So the deformation field is
> defined on the domain of the *input* image.
>
> 3. Then, go back to item 1, how do we achieve the inversion of the
> vector field so as it defines on the domain of the *output* image?
>
> Is there anything I misunderstand? Thanks for any hint!
>
> Best,
> yi

Unfortunately I'm not familiar with this filter, but I would suggest
placing an outline of an example on the wiki:
http://www.vtk.org/Wiki/ITK/Examples

Then hopefully someone will be able to fill in the missing pieces for you.

David