Hi Dynamic,
To measure the visual differences and improvement in image quality compared to target image, you can refer to Difference Structural Similarity (DSSIM) and Blind/Referenceless Image Spatial Quality Evaluator (BRISQUE) methods.
DSSIM is used to calculate the dissimilarity between the images and depicts sensitivity to visual changes.
BRISQUE is a no-reference image quality assessment method which compares image to a default model computed from images of natural scenes with similar distortions.
These methods can be directly put into use by following the below given code snippet:
%DSSIM
[ssim_value, ~] = ssim(img1, img2);
% Calculate DSSIM
dssim_value = (1 - ssim_value) / 2;
%brisque method syntax
brisque_score = brisque(img);
For more information, you can refer to the MATLAB documentation of ‘ssim’ and ‘brisque’ functions:
I hope this helps
