[Insight-users] Quaternion Parameters
Andy Eow
vtkitk at hotmail.com
Fri Oct 1 19:00:14 EDT 2004
Hi,
Have a question regarding quaternions. I obtained the following parameters from running MultiResMIRegistration:
[-0.000237939, -0.0875924, 0.171368, 0.981306, 11.589, 2.08898, 1.14517]
I need to apply a transform that is half the rotation and half the translation of the QuaternionRigidTransform as given by the parameters above. The last 3 parameters are translation so halving those is trivial. Question is how do I go about halving the effective rotation of the transform? Which of the first 4 parameters do I change and can I simply half the rotation angle or do I have to maintain a unit quaternion to avoid scaling issues?
Thanks.
Cheers,
Andy
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