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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 2017-1-2

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评论： Image Analyst 2017-4-26

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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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Asim Maqsood 2017-4-26

编辑：Image Analyst 2017-4-26

And what does it mean if we have a negative answer like -0.5 or -1?

Image Analyst 2017-4-26

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.

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Image Analyst 2017-1-2

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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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