<br>Hi Emmanuel,<br><br>This sounds very useful.<br><br>I would think that an irregularly sampled deformation field <br>can be represented with the KernelTransforms<br><br><a href="http://www.itk.org/Doxygen310/html/classitk_1_1KernelTransform.html">http://www.itk.org/Doxygen310/html/classitk_1_1KernelTransform.html</a><br>
<br>by setting Source and Traget landmarks that are related<br>by the desired deformation vectors.<br><br><br>Note that this transform can be connected directly to<br>the itkResampleImageFilter.<br><br><br><br> Regards,<br>
<br><br> Luis<br><br><br>----------------------------------------------------------------------------<br><div class="gmail_quote">On Wed, Jul 28, 2010 at 12:53 PM, Emmanuel Christophe <span dir="ltr"><<a href="mailto:emmanuel.christophe@gmail.com">emmanuel.christophe@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi all,<br>
<br>
We are using the TransformToDeformationFieldSource with the<br>
WarpImageFilter to apply a deformation to an image. The advantage is<br>
that the WarpImageFilter is able to interpolate the deformation which<br>
enable us to use a subsampled deformation field (speeding up the<br>
computation significantly).<br>
<br>
We would like to be able to adapt the sampling according to some<br>
specific criteria. For this, we would need an irregularly sampled<br>
deformation field and the corresponding image warping filter. We don't<br>
think that there is anything like that in ITK (yet). We are<br>
considering implementing that, but we would like to have suggestions<br>
concerning the best data structure to use to represent this irregular<br>
grid: PointSet, Mesh, anything else?<br>
<br>
Thanks,<br>
Emmanuel and Julien<br>
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