[Insight-users] Multi Resolution Registration : Quaternion transform

[Luis Ibanez]

Hi Robert,

The QuaternionRigid transform can be used as
any of the other transforms.

Note that the one available in the CVS version
now has a SetCenter() method. So it can be use
along with the CenteredTransformInitializer class.

For an example on the use of this class, you can
look at:

  InsightApplications/MultiResMIRegistration/Common

                      MIMRegistratior.h



and at the new registration plugin for VolView:



   InsightApplications/VolviewPlugings/

      vvITKImageRegistration.cxx



Please let us know if you have further questions,


   Thanks


     Luis



-----------------------------
Robert-Paul Buitendijk wrote:
> hi luis
> 
> can you tell me how to make a working project from the data provided in the
> softwareguide about the quaternionrigid transform? is it the same with all
> the other trasforms or not?
> 
> tnx in advance Robert
> 
> -----Oorspronkelijk bericht-----
> Van: Luis Ibanez [mailto:luis . ibanez at kitware . com]
> Verzonden: dinsdag 4 november 2003 23:18
> Aan: Robert-Paul Buitendijk
> CC: insight-users at itk . org
> Onderwerp: Re: [Insight-users] Multi Resolution Registration
> 
> 
> 
> Hi Robert,
> 
> There is no generic way of converting an AffineTransform into
> a rotation. If there is any shearing or anisotropic scaling
> in the matrix, the notion of rotation can no longer be isolated
> from the matrix.
> 
> If you want to recover a rotation, you should use the RigidTransform.
> 
> In particular you may find useful the QuaternionRigidTransform
> if you are working with 3D images.
> http://www . itk . org/Insight/Doxygen/html/classitk_1_1QuaternionRigidTransform
> .html
> 
> This transforms is described in the SoftwareGuide
> http://www . itk . org/ItkSoftwareGuide . pdf
> in Section 8.7.9, pdf-page 301, paper-page 327.
>  From this transform you can recover the rotation in
> the form of a unit quaternion (aka Versor).
> 
> 
> Yes, you can use other metrics and other transforms,
> that's the advantage of the modular design of the
> registration framework in ITK.
> 
> This particular example was doing multi-modality registration,
> in which case your options are limited to the four different
> implementations of MutualInformation available in the toolkit
> 
> Viola-Wells
> http://www . itk . org/Insight/Doxygen/html/classitk_1_1MutualInformationImageTo
> ImageMetric.html
> Mattes
> http://www . itk . org/Insight/Doxygen/html/classitk_1_1MattesMutualInformationI
> mageToImageMetric.html
> Histogram based
> http://www . itk . org/Insight/Doxygen/html/classitk_1_1MutualInformationHistogr
> amImageToImageMetric.html
> Histogram based normalized MI
> http://www . itk . org/Insight/Doxygen/html/classitk_1_1NormalizedMutualInformat
> ionHistogramImageToImageMetric.html
> 
> 
> In transforms you have all the options described in the
> SoftwareGuide in section 8.7, pdf-page 294, paper-page 320.
> 
> A generic lit of transform is also available with
> the Doxygen documentation
> http://www . itk . org/Insight/Doxygen/html/group__Transforms . html
> 
> It is up to you to select the transform that is appropriate for
> modeling the missalignment of your images.
> 
> 
> Please let us know if you have further questions.
> 
> 
> Thanks
> 
> 
>    Luis
> 
> 
> -------------------------------
> Robert-Paul Buitendijk wrote:
> 
>>Hello everyone
>>
>>The 2nd example in the softwareguide provides a matrix which describes the
>>rotation,scaling and shear of the picture.
>>In the guide there is no mention of how to convert the matrix back to a
>>rotation. How can i do this???
>>Is it also possible to use other metrics and transforms, or isn't that an
>>advantage?
>>
>>Tnx Robert
>>
>>
>>_______________________________________________
>>Insight-users mailing list
>>Insight-users at itk . org
>>http://www . itk . org/mailman/listinfo/insight-users
>>
> 
> 
> 
> 
> 
> 
> 
>