how to calculate degree of similarity between two images

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i wanna know if there is a way to calculate degree of similarity between two images?

Accepted Answer

Image Analyst
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.
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RAKESH KUCHANA
RAKESH KUCHANA on 12 Apr 2021
I am unable to find Similarity Index of two images in MATLAB R2013a version. Can anyone help me regarding this?

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