afni.nimh.nih.gov
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:
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
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
| October 26, 2015 02:18PM | |
Here's an example:
In this image, there are two black disks on a white background. One of the disks is half a pixel higher than the other, and this is clearly visible. If I wanted to align the two, I could upsample both images to get higher-resolution but blurry (or in some other way degraded) versions of both. Aligning these would be easier, and then I could report what I did ("Move the second image half an original pixel down"). All of the various image registration programs (3dvolreg, FSL FLIRT, SPM realign, etc.) are designed to do something like this, although each of them has its own clever way to avoid actually upsampling the images, because doing so would take too much time and memory.
In this image, there are two black disks on a white background. One of the disks is half a pixel higher than the other, and this is clearly visible. If I wanted to align the two, I could upsample both images to get higher-resolution but blurry (or in some other way degraded) versions of both. Aligning these would be easier, and then I could report what I did ("Move the second image half an original pixel down"). All of the various image registration programs (3dvolreg, FSL FLIRT, SPM realign, etc.) are designed to do something like this, although each of them has its own clever way to avoid actually upsampling the images, because doing so would take too much time and memory.
| Subject | Author | Posted |
|---|---|---|
|
meinternational | October 24, 2015 06:12AM |
|
Isaac Schwabacher | October 26, 2015 02:18PM |
|
rick reynolds | October 26, 2015 02:40PM |
|
meinternational | October 27, 2015 06:15PM |
