Hi,

I am using registrationx for co-registration, and I wonder if there are any ways to get out the value of the normalized cross-correlation? I am using --ncc as the registration metric. I can't find anything about this when using --help. However, I tried --write-protocol, and I wonder if it is the number that appears before the affine transformation parameters for each step?

Thanks.

Best regards,
Ingrid

Yes, the first number in each row should be the metric being optimized.

Please note, however, that the exact values depend on a number of things such as image interpolation as well as resolution (so the values will change discontinuously when a new level in the multi-resolution procedure begins).

Also note that the values do not have any meaning in terms of registration accuracy, so please don't interpret them that way.

Best,
  Torsten

Hi again, thank you for your answer.

It turned out that --ncc was not an optimal co-registration metric for my images, so I had to use --nmi instead. However, I am still interested in finding the value of the normalized cross-correlation. Are there any other CMTK tools that can do this?

Best,
Ingrid

The "similarity" tool should do what you want. It takes two images, so you need to reslice the moving image first.

The tool prints a variety of image statistics and similarity measures, for either grey-scale ("--grey") or label images ("--label").