[Insight-users] Re: GetJacobian in some transforms

[Luis Ibanez]

Hi Marius,

Rigid2DTransform and Rigid3DTransform cannot have Jacobians
because they are base classes for particular parameterizations
of these transforms.  You will find the Jacobians implemented
in their derived classes.

http://www.itk.org/Insight/Doxygen/html/classitk_1_1Rigid2DTransform.html

http://www.itk.org/Insight/Doxygen/html/classitk_1_1Rigid3DTransform.html

The Jacobian is computed as the derivatives of the mapped point
with respect to the transform parameters. Given that there are
many different ways of parameterizing a rigid transform, those
Jacobians can only be computed once a particular set of parameters
has been selected.  For example, rotation can be represented with
Euler angles or with Versors.

Please don't use the Rigid3DTransform or Rigid2DTransform, use one
of their derived classes.



   Regards,


     Luis


----------------------
Marius Staring wrote:
> Hi Luis Ibanez,
> 
> I am using ITK 1.6 for image registration purposes.
> 
> I noticed that the GetJacobian() function in some of the transform 
> classes has not been implemented. See for example Rigid2DTransform and 
> Rigid3DTransform.
> 
> Is that going to be implemented soon?
> 
> With kind regards,
> 
> 
> Marius Staring
> Image Science Institute
> University Medical Center Utrecht, room F01.703
> Phone: +31 (0)30 250 8562       Fax: +31 (0)30 258 1098
> email: 
> <mailto:marius@isi.uu.nl>marius<mailto:marius@isi.uu.nl>@isi.uu.nl 
> website: http://www.isi.uu.nl/People/Marius/ 
>