I want to find similarity between two images.I use SSIM. What does low and high values of SSIM indicates in terms of similarity.
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senthil vadivu
on 2 Jan 2017
Commented: Image Analyst
on 26 Apr 2017
I want to find similarity between two images.I use SSIM. What does low and high values of SSIM indicates in terms of similarity.
2 Comments
Asim Maqsood
on 26 Apr 2017
Edited: Image Analyst
on 26 Apr 2017
And what does it mean if we have a negative answer like -0.5 or -1?
Image Analyst
on 26 Apr 2017
From the formula in the help, it looks like the only way you could get a negative number is if one of the images has a negative mean value.
Accepted Answer
Image Analyst
on 2 Jan 2017
If you open the example script from the help, and change this line:
[ssimval, ssimmap] = ssim(A,ref);
to
[ssimval, ssimmap] = ssim(ref,ref);
you'll see that the ssim goes from 0.94 to 1.00, showing that if the images are exactly the same, the ssim is 1 and the more different they are, the lower the ssim value, down to as far as zero.
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