[Insight-users] Image coregistration: is the 'origin' information used?

[Luis Ibanez]

Hi Marco,

Yes, ITK uses the image origin,
as well as the image spacing and image orientation,
during the process of performing image registration.


For details on how the pixel coordinates are
computed, please look at the registration tutorial:
http://www.na-mic.org/Wiki/images/b/ba/Insight-Registration.ppt


You should also look at the ITK Software Guide

   http://www.itk.org/ItkSoftwareGuide.pdf

In particular,

A) Section 6.9.4, starting in pdf-page 254,

and

B) Chapter 8, starting in pdf-page 347.


    Regards,


           Luis


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On Wed, Mar 3, 2010 at 7:07 AM, Marco Favetta <Marco.Favetta at le.infn.it> wrote:
> Hi all,
> I am beginning to use itk for image registration, by following the
> recipe given in "'Hello world' registration" in the software guide.
> I read that by setting the translation parameters to (0, 0, 0) I am
> selecting the identity transform (0 mm in each direction).
> My question is: are translations "measured" from the top left (first
> slice) voxel in the images, so that the identity transform overlays the
> matrices by putting their top-left-etc voxels one on top of the other,
> or is the origin information (that nifti and analyze images contain) used?
> Thanks!
> Best regards
> Marco.
>
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