[ITK] [ITK-users] Normalized Cross Correlation returns perfect alignment with images not even overlapping

[Andrew Harris]

Hi, I'm hoping someone can guide me toward an explanation of this.  I run
my pipeline on various ultrasound image sets and get an NCC between 0.65
and 0.8 for good alignments, but on some sets the NCC returns 1.0 when the
images aren't even overlapping.  I have the black areas of the image masked
out, and have even tried cranking up the threshold to be sure the darker
areas aren't being included to no avail.  Any thoughts?

--

AH


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