negative value structural similarity index

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Jad Aoun 2024-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/2084963-negative-value-structural-similarity-index

评论： Matt J 2024-2-22

Hello everyone ,

I aim to compare two 2D arrays which represent the reflectivity of an object.

I generate with the inbuilt ssim function the map of the structural similiraty index. And in some regions i get a negative value. I have read the description of the index and i do not get the physical meaning of a negative value.

P.S : my two images are positive double real numbers

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Jonas 2024-2-21

have a look here for negative values:

https://de.mathworks.com/matlabcentral/answers/1948883-what-is-the-possible-output-range-of-ssim

Jad Aoun 2024-2-21

Thx for your answer Jonas but this does not help. I have two positive real matrixes which values are between 0 and 1 . And I have some local negative ssim values (not especially -1 ,-0.2 for instance) . I don't get the physical meaning . My images are not anti-correlated.

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