# how to calculate degree of similarity between two images

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bay rem on 3 Feb 2016
Commented: Image Analyst on 15 Sep 2019
i wanna know if there is a way to calculate degree of similarity between two images?

Image Analyst on 3 Feb 2016
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.

Peter Kamfor on 17 Jan 2019
lol if Image Analyst doesn't know... It probably doesn't even exists. Spent a month with his comments which were the biggest help in my assignment.
nor azam on 10 Sep 2019
can you explain this part:
err = immse(X,Y)
is it use for image A or both A & Ref image?
Image Analyst on 15 Sep 2019