[ITK] [ITK-users] RegistrationParameterScalesFromPhysicalShif and itkVersorRigid3DTransform

[Bradley Lowekamp]

Hello,

The scales are going to be for the serializable optimization parameters for the Transform defined in the doxygen[1].

You may wish to try the other scales estimators: RegistrationPatameterScalesFromIndexShift, RegistrationParameterScalesFromJacobian

Also the other parameters for your optimizer may need to be adjusted such as InitialRadius, ShrinkFactor and the GrowthFactor. I have not investigated if these optimizer parameters are correctly scales into the parameter space when applied, but they should be.


As you are doing you can theoretically plug any combination of components together. However the results may not be robust or stable. Again I will urge caution with using the Versor transforms with an optimizer other than the RegularStepGradientDescent as there is some coupling of these two to do the correct normalization in the versor space.

Brad



[1] http://www.itk.org/Doxygen/html/classitk_1_1VersorRigid3DTransform.html

On Oct 15, 2014, at 10:26 AM, Gabriel A. Giménez <gabrielgimenez85 at gmail.com> wrote:

> Hello Brad ,thanks for answering, 
> 
> I need the definition of scales Optimizer (translation and rotation) to be
> dynamic, not hard, so I use the RegistrationParameterScalesFromPhysicalShift
> class. Any other alternatives for my problem?. Nor do I find much
> information about how to define these scales and even less dynamically.
> 
> 
> Theoretically ITK architecture is fully modular and low-coupling, then,
> should be no problem to combine different types of optimizers,
> transformations, etc, or am I wrong? 
> 
> 
> 
> 
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