[Insight-users] Scales Type parameters

[Xabier Artaechevarria Artieda]

Hi Jordi,
you can find the answer at page 351 of the ITK Software Guide. The  
idea is to scale all the tranform parameters, so that they have a  
similar order of magnitude in the end.
Hope that helps,
Xabi

-- 
Xabier Artaechevarria
Cancer Imaging Laboratory
Centre for Applied Medical Research
www.cima.es



Jordi Romagós Figueras <neomad666 at hotmail.com> ha escrito:

> Hello everybody,
>
> First of all I apologize for my English, this is my first post in Internet.
>
> I’m using itk for mammography images registering , and I’m trying the
> different kinds of Optimizers, Metrics and Transformations.
>
> Now, all works with example images (for example
> BrainProtonDensitySliceBorder20.png with rotations and translations). But
> with mammography images doesn’t work, I discovered is due for Scales Type
> parameters of Transformer that I put on Optimizer (Regular Gradient) or in
> Metric (Normalized Mutual Information).
>
> I found one example in one PowerPoint put 1.0 for angle parameters and
> 1/1000 in the others parameters, this works fine with the example images
> like BrainProtonDensitySliceBorder20. Then, after trying various values for
> mammographies images I found works “well” with 1/1000000 for non angle
> parameters. My question is about Scales Type Parameters, I don’t understand
> what relation must have.
>
> I use Affine Transform and Rigid (Centered and not Centered) Transform.
>
> Thanks, Jordi.
>
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