[Insight-users] Transforming a vector image

[Luis Ibanez]

Hi Jochen,

We don't have a built-in filter that will rotate the
vector pixel values of a vector image.

However,
you could easily implement such filter by using the
itkVersor class in order to rotate the Vectors.

The new filter could easily derive from the class:

                     itkUnaryFunctorFilter.

See for example the:

                itkVectorCastImageFilter.h


      Regards,


            Luis


-------------------------------------------------------------------
On Wed, Oct 7, 2009 at 3:28 PM, Jochen Cammin <jcammin1 at jhmi.edu> wrote:
> Hi,
>
> I have a 3D image with pixels of type 3D-vector (which represents the
> motion vector field of a 3D image). I apply an affine transformation to
> the vector image. But it appears that only the pixels coordinates
> are transformed but not the vectors.
>
> For example: The vector field is (0, 0, 0) everywhere except for the
> coordinate (10, 0, 0) where the associated vector is (1, 0, 0). The
> spacing is unity in all directions. When I rotate the vector image
> counterclockwise around the origin by 90 degrees, the coordinate of the
> non-zero vector is (0, 10, 0), as expected, but the pixel value is still
> (1, 0, 0) where it should be (0, 1, 0).
>
> Doe ITK have a functionality to also rotate the actual vectors of a
> vector image? I also tried to define the image with CovariantVectors,
> but it makes no difference.
>
> Thank you,
> Jochen
>
>
>
>
>
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-users
>