[ITK] affine transform parameters

[Matt McCormick]

Hi Samah,

As described in the class documentation [1], "the first (NDimension x
NDimension) parameters defines the matrix in row-major order (where
the column index varies the fastest). The last NDimension parameters
defines the translation in each dimensions."

HTH,
Matt

[1] http://www.itk.org/Doxygen/html/classitk_1_1AffineTransform.html

On Mon, Feb 1, 2016 at 3:57 PM, samah bouzidi <samah.bouzidi at gmail.com> wrote:
> 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
>> >
>> >
>> >
>> > _______________________________________________
>> > Community mailing list
>> > Community at itk.org
>> > http://public.kitware.com/mailman/listinfo/community
>> >
>
>