[ITK] [ITK-users] CorrelationImageToImageMetricv4 returns 0 from GetValue()

[Andrew Harris]

Hello all,
I am having a devil of a time setting up the CorrelationImageToImageMetricv4
and getting a result that makes sense.  I have written an observer that
outputs to a text file the iteration number, correlation value, and current
position.  I have generated a virtual phantom image of a white cube on a
black background, and when I put the same image through for fixed and
moving images, I get [0,0,0,0,0,0], meaning that no rotation or translation
is required for the images to be aligned.  This is the correct versor and
vector transform, and if I apply a translation the correct distance values
are returned to have the images align, however the metric value returned is
also 0 and a perfect registration like this should yield a metric of -1
according to the documentation.  Additionally, it doesn’t seem to be
analyzing rotation properly, as when I introduce a rotation around any axis
the metric returns a translation on the other two axes but the rotation
versor remains at zero.

I’m attaching my code as well, it’s possible I’ve not set some parameters
up properly:


--

AH


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