[Insight-users] GetCenter(); : SetCenter() MUST be done before starting the registration.

[Luis Ibanez]

Hi Tony,


You should set the Center of the Transform to the center of
the Fixed object.

In the case of PointSet to Image registration, the Fixed
object is the PointSet.


                YOU MUST SET THE CENTER
                      *BEFORE*
          YOU START THE REGISTRATION PROCESS.


The center is used all the time during the registration process.
Setting the center at the end of the registration is an incorrect
use of the transform.

Setting the center, is one of the most important aspects of
initializing the transform.



Regards,


     Luis


-------------------
tony hakki wrote:
> Hello Dear ITK users;
>  I just want to ask that ,when I implement the 
> pointSetToImageRegistration Should I  Set The Center of Transform . if 
> Yes,Should I set the point set's center or image's center? I run the 
> registration procees first without settting center and then secondly I 
> set the center . At the end of the processing the results are same and 
> it says center is [0,0,0] even if I set the center? and the results look 
> too small aren't they?
> here is the results of transform
>  
> *bestvalue:   0.951138
> Numberof iterations:  21*
> VersorRigid3DTransform (04DD3358)
>   RTTI typeinfo:   class itk::VersorRigid3DTransform<double>
>   Reference Count: 4
>   Modified Time: 1185
>   Debug: Off
>   Observers:
>     none
>   Matrix:
>     0.999761 -0.00188086 0.021768
>     0.001634 0.999934 0.0113526
>     -0.0217879 -0.0113144 0.999699
>   Offset: [1.00002, -0.883977, -3.28772]
>   Center: [0, 0, 0]
>   Translation: [1.00002, -0.883977, -3.28772]
>   Inverse:
>     0.999761 0.001634 -0.0217879
>     -0.00188086 0.999934 -0.0113144
>     0.021768 0.0113526 0.999699
>   Singular: 0
>   Versor: [ -0.00566718, 0.0108898, 0.000878781, 0.999924 ]
> *center: [0, 0, 0]*
> 
> 
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