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

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Bob Cox
November 10, 2008 02:51PM
You can use AFNI's 3dAllineate program. In particular,

3dAllineate -base dataset1+orig -source dataset2+orig -allcostX

should give you a printout of all the cost functions it uses to measure the difference between 2 volumes. Some of these are inverted, such as Mutual Information (MI), which is larger when the images are more similar, and since 3dAllineate minimizes cost functions, MI is negated in this printout.

For more information on the options you can add to 3dAllineate that affect the cost function calculations (masks and/or weights), see the output of '3dAllineate -HELP'

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[afni.nimh.nih.gov]

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Subject Author Posted

Comparing two images

siamak November 10, 2008 11:01AM

Re: Comparing two images

Bob Cox November 10, 2008 11:36AM

Re: Comparing two images

siamak November 10, 2008 12:16PM

Re: Comparing two images

Bob Cox November 10, 2008 02:51PM

Re: Comparing two images

siamak November 10, 2008 04:18PM

Re: Comparing two images

Bob Cox November 10, 2008 04:27PM

Re: Comparing two images

siamak November 11, 2008 11:35AM