[Insight-users] rigid registration

[Bill Lorensen]

I have had very good results using the AffineTransform with both ViolaWells 
and Mattes MI. I did have to scale the translate parameters a lot smaller 
than I used for the Rigid Quaternion.

Bill

At 02:01 PM 5/24/2004, raghu venkatram wrote:
>Hello Luis,
>
>I have been experimenting with the Affine transform along with viola-wells 
>imagetoimagemutualinformation and mattesmutual information metrics.
>
>The affine transform which consists of 9(rotation, scaling, shearing) + 3 
>translation is a 12 parameter transform. Adopting rigid constraints and 3 
>parameters 3(rotation) + 3(translation) to define the transformation,
>i am not sure of how to reduce the 12 parameters to 6, Ashburner and 
>Friston (SPM people) suggest a method in ther Spatial registration paper.
>I am right now, weighting the rotation optimizer scales way higher than 
>the translation optimizer scales.
>The alternative would be to first determine the 3 translation paramters 
>and then the rotation parameters.
>
>I would be glad if you had any suggestions in defining and optimizing a 6 
>parameter transform under the rigit constraints
>
>
>Warm regards,
>Raghu
>
>
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