Image Similarity

[celibol]

I Have some questions

1. How to calculate 2 images similarity percentage?
2. How to Visualizing image differences? (Like this https://pyimagesearch.com/2017/06/19/image-difference-with-opencv-and-python/)

Thanks

[Laex]

I can't look at it in detail yet, but there are several publications on this topic:
CV - Extract differences between two images
Visualize differences between two images