[ITK Community] [Insight-users] ITKBsplineSyN learning rate

[Luis Ibanez]

Hi Ema,

After reading Brian's and Nick's answers to your more recent post,

I realized that I missed line 407:

https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Registration/RegistrationMethodsv4/include/itkSyNImageRegistrationMethod.hxx#L407


 RealType localNorm = 0;
    for( unsigned int d = 0; d < ImageDimension; d++ )
      {
      localNorm += vnl_math_sqr( vector[d] / spacing[d] );
      }
    localNorm = vcl_sqrt( localNorm );



Where the spacing of the image is already taken into account while
computing the norm.

So,
the LearningRate is indeed to be set as a ratio (not related to units), and
as Nick and Brian suggest, starting with something between 0.1 and 0.25.


   My apologies for the confusion


      Luis
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