[ITK] affine transform parameters

[samah bouzidi]

Hi Matt,

i will try to use the  Rigid transform. But, i would like to know in that
example what are these parameters in 2D (or 3D) ?
are they the rotation angle the offset of the center and the translations
parameters as it is described in the ITK software guide ( pdf page 490).

regards,
Samah.



2016-02-01 17:19 GMT+01:00 Matt McCormick <matt.mccormick at kitware.com>:

> Hi Samah,
>
> By calling SetFixedParameters to specify the center of rotation and
> SetMatrix on a class that inherits from Rigid3DTransform [1], rotation
> angles can be obtained in the form desired, (Euler angles, versor,
> ...). But, SetMatrix will fail if the matrix is not orthogonal.
> Therefore, if a rigid transformation is desired, then the optimization
> should be performed with a VersorRigid3DTransform.
>
> Hope that helps,
> Matt
>
>
> [1] http://www.itk.org/Doxygen/html/classitk_1_1Rigid3DTransform.html
>
> On Mon, Feb 1, 2016 at 8:58 AM, samah bouzidi <samah.bouzidi at gmail.com>
> wrote:
> > Hi,
> >
> > I am running an Affine transform registration in 3D (using this example
> >
> http://itk.org/Wiki/ITK/Examples/Registration/ImageRegistrationMethodAffine
> ).
> > I obtain 12 final parameters as : [ a b c d e f g h i j k l] assuming
> that
> > j, k,l are the translation parameters where are the rotation parameters
> and
> > how can I obtain the rotation angle ?
> > my intial parameters are :
> > R= [100
> >       010
> >      001]
> > and
> > tx=1
> > ty=1
> > tz=1
> > Thank you so much for your help,
> > Samah
> >
> >
> >
> > _______________________________________________
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> > Community at itk.org
> > http://public.kitware.com/mailman/listinfo/community
> >
>
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