[ITK] optimizer scales and weights

[Luigi Riba]

Dear all,

I'm working on ITK 4 and, for the moment, I have always payed attention
only to the SetScales method for the optimizer.

Out of curiosity, what is the role of the SetWeights method? What are the
differences between SetWeights and SetScales? Shoud this two methods be
used in conjunction?

Thanks in advance for the help.

Best,
Luigi
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