[Insight-users] Parameter scales for registration (second try)

[Joël Schaerer]

Hi Nick,

I did indeed have a look at these new classes (not a very thorough one, 
I must confess). However if I understand correctly they allow estimating 
the parameter scales, but don't change the way the scales are used by 
the optimizer?

joel

On 07/05/2013 13:52, Nick Tustison wrote:
> Hi Brad,
>
> Have you seen the work we did with the class
>
> http://www.itk.org/Doxygen/html/classitk_1_1RegistrationParameterScalesEstimator.html
>
> and it's derived classes for the v4 framework?  They describe
> a couple different approaches to scaling the gradient for use
> with the v4 optimizers.
>
> Nick
>
>
> On May 7, 2013, at 6:59 AM, Bradley Lowekamp <blowekamp at mail.nih.gov> wrote:
>
>> Hello Joel,
>>
>> I have encountered the same issue. I ended up creating my own "ScaledRegularStepGradientDescentOptimizer" derived from the an ITK one. Please find it attached. Please note, I don't think I have migrated this code to ITKv4.... but I not certain.
>>
>> I reported this issue to the ITKv4 registration team, but I am not sure what happened to it.
>>
>> I also tried to make the change in ITK a while ago, and a large number of the registration tests failed... not sure if the results were better or worse, they were just different.
>>
>> Brad
>>
>> <itkScaledRegularStepGradientDescentOptimizer.h>
>>
>> On Apr 25, 2013, at 11:10 AM, Joël Schaerer <joel.schaerer at gmail.com> wrote:
>>
>>