[ITK-users] Applying transform with a rotation, translation, and offset to points

[Matt McCormick]

Hello Andrew,

To apply the transformation, typically the methods,

  itk::Image::TransformIndexToPhysicalPoint
  itk::Transform::TransformPoint

would be used.


Nonetheless, a matrix representation from VersorRigid3DTransform can
be obtained from its base class methods
itk::MatrixOffsetTransformBase::GetMatrix and
itk::MatrixOffsetTransformBase::GetOffset.

HTH,
Matt

On Wed, Mar 22, 2017 at 3:15 PM, Andrew Harris <aharr8 at uwo.ca> wrote:
> Hello,
> I would like to be able to duplicate the applicaiton of a
> VersorRigid3DTransform that incorporates a rotation, translation, and offset
> to points selected to calculate TRE between a fixed and transformed moving
> image.  I’m confused about how the 3x3 matrix, 3x1 transform, and 3x1 offset
> are applied within a ResampleFilter.  If I could get them composed into a
> 4x4 transform matrix I could apply that to the points selected in the moving
> image and calculate the distance between the transformed points and the
> corresponding points in the fixed image.  Any help would be appreciated.
>
> --
>
> AH
>
>
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