[Insight-developers] Scales estimation for registration

[Stefan Klein]

my new email address is s.klein at erasmusmc.nl by the way. Please 
reply-to-all this email.
Stefan

On 06/05/2011 22:52, Bill Lorensen wrote:
> Marius, Stefan and Bao,
>
> One of the major weaknesses in ITK's registration framework is the
> estimation of parameters. In particular, the estimation of the scales
> seems to require special magic. My experience has been that the
> selection of a proper scaling for translation is particularly
> difficult. ITK traditionally (and currently) leaves the scaling
> decision up to the application. There are currently two possible
> approaches to this estimation.
>
> 1) Bao's itkParameterScaleEstimator proposed in this gerrit topic:
> http://review.source.kitware.com/#change,1499
> 2) Elastix's (http://elastix.isi.uu.nl/) AutomaticScalesEstimation
>     method implementation in elxTransformBase.
>
> For Marius and Stefan I have questions:
>
> a) How successful is elastix's AutomaticScalesEstimation?
> b) Currently this is implemented as a method in
>     elxTransformBase. Could it be implemented in an API similar to Bao's
>     itkParameterScaleEstimator?
>
>
> For Bao's implementation, my concern is the addition of a free
> parameter GlobalScalingFactor. It is not clear how to pick a proper
> value. To me there is as much mystery in this parameter as there is in
> picking a proper translation scaling
>
> Bill
>
>
>
>
>
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-- 
Stefan Klein
+31 10 7043049
http://www.bigr.nl/people/StefanKlein