AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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April 17, 2019 01:15PM
Hi, Paul
I am trying to follow-up the discussion here. Is there any way that you can apply an affine transform but without resampling the data? In my opinion, you can just do like

new_img_affine = affine_xfm * old_img_affine,

where old_img_affine is the geometry info you can read from the file header. Then you can just update old_img_affine to new_img_affine such in the file header. In this case you do not need to resample the data at all. Maybe I miss something here.. but it seems that this is the simplest way to do it.


Best
Ruyuan
Subject Author Posted

3dAllineate and affine transformation

ruyuanzhang April 16, 2019 04:19PM

Re: 3dAllineate and affine transformation

ptaylor April 16, 2019 06:24PM

Re: 3dAllineate and affine transformation

ruyuanzhang April 16, 2019 06:33PM

Re: 3dAllineate and affine transformation

ruyuanzhang April 16, 2019 06:36PM

Re: 3dAllineate and affine transformation

ptaylor April 16, 2019 06:45PM

Re: 3dAllineate and affine transformation

ruyuanzhang April 16, 2019 07:53PM

Re: 3dAllineate and affine transformation

ptaylor April 16, 2019 06:49PM

Re: 3dAllineate and affine transformation

ruyuanzhang April 17, 2019 01:15PM

Re: 3dAllineate and affine transformation

ptaylor April 17, 2019 01:24PM

Re: 3dAllineate and affine transformation

ruyuanzhang April 17, 2019 04:20PM