I am trying to prevent near-duplicate images in my system. But I need to check each incoming image against all existing ones. So it is not 1-1 similarity check. And sometimes images are not the same but almost identical. For example see these 2 images (note the slight brightness difference):

I am trying to prevent near-duplicate images in my system. But I need to check each incoming image against all existing ones. So it is not 1-1 similarity check. And sometimes images are not the same but almost identical. For example see these 2 images (note the slight brightness difference):