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As far as I know and if I understand your question correctly, Google does not consider duplicate images = duplicate content. https://www.youtube.com/watch?v=k15GpWfsxZU But you can bet if it is a stock image, still the higher ranking PAGES rank their images better than yours, even if it is identical stock photos, with identical name and tags as well as meta data.

They have the ability to, if it's actually being used with live data that i'm not sure. I posted a link to a few interesting articles on a forum i'm on: http://forums.seochat.com/seo-help-general-chat-16/google-understanding-images-482771.html

Google is your friend: They may well use it, per what they have stated previously. https://webmasters.googleblog.com/2012/04/1000-words-about-images.html https://www.youtube.com/watch?v=ibnBpjMfKdY