[Insight-users] How to use Powell optimizer?

[Luis Ibanez]

Hi Huanxiang

It should be possible to use the Powell optimizer
along with the VersorRigid3D, *as long as* you set
it to walk very small steps.

It will be very nice of you to share the *exact*
error messages with us.


You may want to try the itkVersorRigid3DTransformOptimizer
that is customized to be used with the VersorRigid3DTransform,
given that the space of Versors is not a Vector space, and
therefore the typical approach of Gradient descent optimizer
is not linear enough.


Versor are not composed by using the addition operator.
This is explained in the ITK Software Guide

    http://www.itk.org/ItkSoftwareGuide.pdf


---


Please post the *exact* error messages to the
mailing list.



    Regards,


       Luis


----------------------
Huanxiang Lu wrote:
> Hello everyone,
> 
>  
> 
> I am trying to use Powell optimizer with VersorRigid3D transform. But it 
> seems that it will get errors when I start the registration step. Does 
> this optimizer not get along with versor transform or is there any 
> specific parameter have to be set?
> 
>  
> 
> Thank you very much,
> 
> _____________________________________________ 
> 
> Huanxiang Lu
> 
> Ph.D. Student, Medical Image Analysis
> 
>  
> 
> University of Bern
> 
> ARTORG Center for Biomedical Engineering Research 
> 
> Stauffacherstrasse 78
> 
> CH-3014 Bern
> 
> Tel +41 31 631 59 49
> 
> Fax +41 31 631 59 60
> 
> huanxiang.lu at artorg.unibe.ch <mailto:huanxiang.lu at artorg.unibe.ch>
> 
> www.artorg.unibe.ch/ <http://www.artorg.unibe.ch/>
> 
>  
> 
> 
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