[Insight-users] help

[Luis Ibanez]

Hi Tina,

This error appears when the optimizer is taken steps that are too large.

Please start your optimization with a very small learning rate (if you
are using the GradientDescent optimizer) or a very small initial step
length (if you are using the RegularStepGradientDescentOptimizer).

Did you pluged in a Command/Observer to your optimzer ?

This is very helpful to track the progress of the transform
parameters. You will find examples on how to do this in the
Registration chapter of the SoftwareGuide

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

Chapter 7, pdf-page 171. and the associated code in

          Insight/Examples/Registration


Regards,


    Luis


--------------
tina lee wrote:
> I tried to align two 3D datasets with affineTransform as the transform, 
> no matter how I set up the translation scales and  other paramters, I 
> either got error messages about "all points are mapped outside of moving 
> image" or there is nothing changed in the moving image. Could anyone 
> give me a hint about how to initialize and tune the parameters?
>  
> Thanks,
>  
> Tina
>