[Insight-users] map mesh points from transformed volume to original volume

[Olga C. Avila-Montes]

Ok so we figured what was happening. . .
I thought the filterOblique transform was going from my original volume to
the transformed one, but turns out that it's the opposite: it's going from
the transformed volume to the original. Therefore I didn't need to find the
inverse transform. Here is how I finally transformed each point:

PointType pointout =  filterOblique->GetTransform(  )->TransformPoint( point
);
mesh->SetPoint( pointid, pointout );

Olga C Avila-Montes
Research Assistant, Computational Biomedicine Lab (www.cbl.uh.edu)
Dept. of Computer Science, University of Houston, Houston, TX 77204-3010
Email: ocamcaro at gmail.com


On Sat, Jul 2, 2011 at 7:11 PM, Olga C. Avila-Montes <ocamcaro at gmail.com>wrote:

> Hi everyone!
>
> I'm using the filter itk::ObliqueSectionImageFilter from the Insight
> Journal article:
> http://www.insight-journal.org/browse/publication/168
> to obtain a transformed volume where I perform a segmentation and obtain
> its mesh using itkBinaryMask3DMeshSource.
> Each slice of the transformed volume is coming from a different plane of
> the original volume, and I want to map back the points from the mesh to the
> original volume space, but I have not been able to. . .
> I tried accessing each point from the mesh and applying the inverse
> transform using TransformPoint like this:
>
> inverseTransform = dynamic_cast< TransformType* >(
> filterOblique->GetTransform(  )->GetInverseTransform(  ).GetPointer(  ) );
> PointType pointout = inverseTransform->TransformPoint( point );
> mesh->SetPoint( pointid, pointout );
>
> but is not giving me good results, and I'm not sure what I'm doing wrong
> Do you know how can this be achieved?
> Thanks!
>
> Olga C Avila-Montes
> Research Assistant, Computational Biomedicine Lab (www.cbl.uh.edu)
> Dept. of Computer Science, University of Houston, Houston, TX 77204-3010
> Email: ocamcaro at gmail.com
>
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