[Insight-users] Question about getting current angle in eachiteration

[Luis Ibanez]

Hi Jay,

Rotation angles do not make sense in Deformable Registration
methods such as the Demons Algorithm implemented in ITK.
Demons provides you with a deformation field represented as a
vector image.

Rotation angles can only be associated with Rigid Transforms,
which is actually a very restricted case on image registration.


Regards,


    Luis



--------------
Jay Li wrote:

> Hi, Julien,
>  
> Thanks a lot for your reply.  I wonder if ITK has a function to get the 
> rotation angle for each iteration for every registration method, such 
> like demons, multi-resolutional and so so, not only for 
> itkEuler3DTransform. Is GetCurrentPosition able to do so?  
>  
> Thanks
>  
> Jay
> 
> */Julien Jomier <jjomier at cs.unc.edu>/* wrote:
> 
>     Hi Jay,
> 
>     The observer in the registration process has access to the
>     parameters of the
>     transformation. For instance, if you are using itkEuler3DTransform, the
>     first three parameters represents the current angles (around X,Y and
>     Z). So
>     you can do something like:
> 
>     double currentRotationAngleX = optimizer->GetCurrentPosition()[0];
> 
>     and this will return the current angle around the X axis.
> 
>     Hope this helps,
> 
>     Julien
> 
>     -----Original Message-----
>     From: insight-users-bounces at itk.org
>     [mailto:insight-users-bounces at itk.org]
>     On Behalf Of Jay Li
>     Sent: Thursday, July 29, 2004 5:41 PM
>     To: insight-users at itk.org
>     Subject: [Insight-users] Question about getting current angle in
>     eachiteration
> 
> 
>     Dear All,
> 
>     I have a simple question about the observer in the process of
>     registration.
>     Can I get the current rotation angle from each iteration? Does ITK have
>     GetCurrentAngle() this kind of function?
> 
>     Thanks.
> 
>     Jay
> 
> 
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