[Insight-users] Iteration stops so fast!

[Luis Ibanez]

Hi Yu,

Please connect a Command observer to your optimizer
and print out the values of the Metric and the
VersorTransform parameters at every iteration.

Then post that list of values to the mailing list.

You will find many examples on how to connect Command
Observers to optimizers if you look at the Registration
chapter of the ITK SoftwareGuide

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



The most common reason for having an early stop
of the optimizer is to have set up a minimal step
length that is too large.



Regards,



   Luis



------------
Yu Qi wrote:

> MRI/fMRI
> I use
>  
> /Viola MI metric/
> /versorRigid3D Transforms/ and /Optimizer/ with /centeredTransform /
> /                                                                                   
> initializer/
> /linear interpolator/
>  
> my parameters were as follows,
> optimizer scale= [1, 1 , 1 , 0,001 , 0,001 , 0,001]
> imageStandardDeviation=0.4
> number of spacial samples=80
> numberOfIterations=200
>  
> It seems that the iteration stops around 15 every time.
> and the result were the same bad no matter how I changed the parameters.
>  
> What happened?
>  
> 
> 
> *Best Regards!*
> ** 
> *Yu Qi*
>  
>  
> 
> 
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