how to calculate degree of similarity between two images?

B
bay rem · Feb 5, 2024 · 2.2K views
Question
i wanna know if there is a way to calculate degree of similarity between two images?  
Expert Answer
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John Williams PhD Expert
Answered Aug 28, 2026
ssimval = ssim(A,ref) computes the Structural Similarity Index (SSIM) value for image A using ref as the reference image.
 
peaksnr = psnr(A,ref) calculates the peak signal-to-noise ratio for the image A, with the image ref as the reference. A and ref must be of the same size and class.
 
err = immse(X,Y) calculates the mean-squared error (MSE) between the arrays X and Y. X and Y can be arrays of any dimension, but must be of the same size and class.
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