[Insight-users] Rigid + Scale transform

[Luis Ibanez]

Hi Vicente,

Daniel Blezek modified the VersorRigidTransformOptimizer in order to
make possible to use it for Transforms different from the VersorRigid3D
Transform.

As long as you arrange your extra transforms parameters to be at the
end of the parameters array when you call GetParameters() and
SetParameters(), then this optimizers should work for your purpose.



Daniel: It took me a while to understand the reason why you extended
         this optimizer. My apologies for being slow.



   Regards,


      Luis



----------------------
Vicente Grau wrote:
> I am trying to do a 3D registration combining a rigid transform with 
> independent scaling in the three axes. The closest I've found in the 
> library is the itkScaleSkewVersor3DTransform, so my idea was to use this 
> as a base and remove the skew part, either by writing a new transform 
> class or by introducing a factor with SetScale() that effectively 
> eliminates this effect. I also thought about modifying 
> QuaternionRigidTransform to allow for non-unit quaternions. What do you 
> think is the best way to do this?
> Furthermore, I guess I will need a special optimizer due to the 
> parameters forming a non-vector space. Is there an optimizer that works 
> with the ScaleSkewVersor3DTransform? Or, if not, how should I modify the 
> existing optimizers (VersorRigid3DTransformOptimizer, I guess)?
> Any help will be much appreciated!
> 
> Vicente Grau
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