Storing MeanSquare​s/MattesMu​tualInform​ation Metric Value from Imregister

How can I store the values of the registration metric after optimization when using imregister.

Using DisplayOptimization 'true', the iteration and corresponding metric value (Mean Square Error/Mattes Mutual Information) is displayed in the command window.

However, I would like to store the value so I can compare the quality of a series of registrations using the metric. regmex.mexw64 in imregtform.m performs the registration but I cannot access the mex code.

Is there a straightforward way to do this? Any help would be much appreciated.

[Matt J]

Luca Baldassarre asked:

Is there any update on this? I am also trying to evaluate the performance of the image registration, but I cannot output the value of the optimized metric.

[Michael Price]

Same here. Right now I'm using 'DisplayOptimization',true with diary, but that's a ridiculous kluge. Ideally the underlying objective function could be directly called. There are many reasons one would want to do this, such as to calculate the Hessian.

Answer 1

[Matt J]

You could probably use EVALC to grab it off the screen.

I would just implement your own metric. It seems dangerous to rely on a metric whose implementation is hidden from you for any kind of follow-up assessment.

[Matt J]

I agree, though, that it would be nice if the registration.metric.MattesMutualInformation and similar classes had some public methods defined so that you could compute these things.