[ITK] [ITK-users] Jacobian in translation transform

[Matt McCormick]

Hi Lianli,

The ComputeJacobianWithRespectToParameters takes an input parameter
the position in space that the jacobian is to be computed, so it
returns the value at that point in space.  For the
TranslationTransform, it is not that interesting since the jacobian is
a uniform identity matrix.

Hope this helps,
Matt

On Fri, Oct 24, 2014 at 1:08 PM, Lianli Liu <llliu at umich.edu> wrote:
> Hi all,
>
> I am quiet new to registration and I am having difficulty understanding the
> Jacobian matrix calculated in translation transform. From my understanding,
> the ComputeJacobianWithRespectToParameters should calculate the shift of
> EACH voxel with respect to parameters, thus the matrix size should be
> related with number of voxels? But the Jacobian matrix here is only related
> with image dimensions? (3 by 3 for 3D image). Can anyone help me understand
> this?
>
> And I am confused for other transformation methods such as rigid, where is
> the Jacobian calculated? Thanks!
>
> Best,
> Lianli
>
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