Hi Michael,<br><br>The values that are printed by the CommandIterationUpdate<br>are not relative to the initial Transform values. They are indeed<br>the current transform values.<br><br>The common mistakes in registration are:<br>
<br> 1) Failing to initialize the Transform properly<br> (Are you using the transform initializer ?)<br><br> 2) Failing to set the parameter scales properly.<br> (are you scaling rotations with respect to translations?)<br>
<br> 3) Using unbalanced values in the settings of the optimizer<br> E.g. a step length that is too large..<br><br><br>If you want more details...<br>then we were need more details about your registration setup :-)<br>
<br><br> Regards,<br><br><br> Luis<br><br><br>----------------------------------------------------------------------<br><div class="gmail_quote">On Tue, Jul 28, 2009 at 12:22 PM, Michael Jackson <span dir="ltr"><<a href="mailto:mike.jackson@bluequartz.net">mike.jackson@bluequartz.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I am running some code and I am not sure I am interpreting the results correctly:<br>
<br>
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).<br>
<br>
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.<br>
<br>
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?<br>
<br>
If Question 1 answer is, "No it is absolute" then what might I be doing wrong?<br>
<br>
If code is needed to elaborate on my question I can try and strip things down to try and show what I am doing.<br>
<br>
Thanks for any help.<br>
_________________________________________________________<br>
Mike Jackson <a href="mailto:mike.jackson@bluequartz.net" target="_blank">mike.jackson@bluequartz.net</a><br>
BlueQuartz Software <a href="http://www.bluequartz.net" target="_blank">www.bluequartz.net</a><br>
Principal Software Engineer Dayton, Ohio<br>
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</blockquote></div><br>