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

[Dženan Zukić]

Hi Andrew,

your masks might be inverted. If NCC gets all black pixels in both images,
the correlation will be perfect.

Regards,
Dženan

On Thu, Mar 30, 2017 at 2:13 PM, Andrew Harris <aharr8 at uwo.ca> wrote:

> 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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