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Why dice similarity is so low for those two images?

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Please see attached images. Even in the eye seem that are very close one image to the other since they are more or less the same with different post processing values.
Yet the dice(x,y) gives me only 0.00272479564032698
where it should give me close to 1. With that number it tells me that those two have nothing in common which is not true.
What am I doing wrong?
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Stelios Fanourakis
Stelios Fanourakis on 12 Sep 2019
Has something to do with the Bitdepth? At one pic is 8 and the other is 1.

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Accepted Answer

Image Analyst
Image Analyst on 12 Sep 2019
Because not many of the white pixels are in the same location in the two images. Maybe you can try imregister() first to align them, and then try again.
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