[Insight-users] Interpretation of output results from CenteredRigid2DTransform

[Michael Jackson]

I am running some code and I am not sure I am interpreting the results  
correctly:

  I have a CenteredRigid2DTransform that I use to register a pair of  
images. During setup I have access to values for the rotation that put  
me "in the ballpark" and so I use that to set the initial transform  
parameters. (lets say for argument sake that the value for the  
rotation is 0.6 radians).

   As the registration proceeds I use a CommandIterationUpdate object  
(straight out of the Itk guide) to monitor the registration. What  
concerns me is that the rotation shown during the output of the  
registration is a value like 2.21E-5.

   Question 1: Is the value that I see during the registration (as  
printed to the screen through the CommandIterationUpdate object)  
_relative_ to the initial rotation?

   If Question 1 answer is, "No it is absolute" then what might I be  
doing wrong?

If code is needed to elaborate on my question I can try and strip  
things down to try and show what I am doing.

Thanks for any help.
_________________________________________________________
Mike Jackson                  mike.jackson at bluequartz.net
BlueQuartz Software                    www.bluequartz.net
Principal Software Engineer                  Dayton, Ohio