[Insight-users] Mask, weight, ignore or reduce DOF in a registration process

[parseval]

Hello, 

does anybody know if it is possible to reduce the DOF or parameter search
space for a given/knwon itk transformation or optimizer:

For example I use a 3DEuler transformation and a gradient-descent optimizer
but I don't want to search all 6 free parameters and lets say I want to
ignore the translation in y direction.  So actually I only search in 5 DOF.
With the setScales I can weight the free parameters, but is there a
different way to weight a free parameter with approx. "zero".  (And of
course if I really set the scale = 0, it crashs !)

Is it possible with a simple trick, without writing a new transform class ? 
Many thanks and best regards, 
Parseval 
--> my first post. Please dont' hit me !







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