[ITK-users] [Insight-users] Principal Axes pre-registration

[Bradley Lowekamp]

Hello,


I just wrapped this class for SimpleITK. I found it odd that by default the "ComputeRotation" parameter is set to off. With turing this parameter on I got good initialization for some anisotropic blobs. Did you turn this on?

Regarding you other question regarding the VersorTransfrom. The "versor" representation for rotation an represent an arbitrary rotation about the origin. So one is quite sufficient.

Brad



On Aug 4, 2014, at 2:02 PM, tina <fttfzzx227 at 126.com> wrote:

> Hi,
> Can anybody tell me about how to implement a principal axes registration use ITK? I use itkCenteredVersorTransformInitializer.txx to initialize the VersorRigid3DTransform,but this function didn’t implement the rotation,so I try to compute the angle of rotation from the fixedPrincipalAxes and the movingPrincipalAxes, is there any way else to get the rotation matrix?
> Another problem is does the rotation matrix only specify one axis of the coordinate? I mean: in order to registrate two coordinates(x,y,z;x’,y’,z’),we should implement the VersorRigid3DTransform 3 times?
> Any help would be greatly appreciated!
> Best regards,
> Tina
>  
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