[ITK-users] Question about itkCenteredVersorTransformInitializer

[Bradley Lowekamp]

Hello Jan,

Please remember that the ITK registration framework ( and initializers ) produce a transform which maps points from the fixed image to the moving image. My first guess is that you are applying the transform in the wrong direction.

Brad

On Mar 10, 2015, at 12:14 PM, Jan Schepers <janschepers1 at gmail.com> wrote:

> Hello,
> 
> in the method InitializeTransform the rotation matrix is computed as follows:
> MovingMatrixType rotationMatrix = movingPrincipalAxis * fixedPrincipalAxis.GetInverse();
> 
> This doesn't work for me. If I change it to 
> MovingMatrixType rotationMatrix = movingPrincipalAxis.GetInverse() * fixedPrincipalAxis;
> then I get the results that I expected. Strangely, both rotation matrices are not even each other's inverse.
> 
> Did anyone experience the same problem?
> 
> Best regards,
> Jan
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