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is there a way to use a GUID as a label in FaceRecognizer?


I've been playing with the FaceRecognizer stuff in opencv 2.4.5 and was wondering if there is a way to use a GUID like 25892e17-80f6-415f-9c65-7395632f0223 as a label in an lbph model?

I want to build a very scalable solution and don't want to be limited to a label based on an Integer. Please correct me if I'm wrong, but to my understanding this would limit the number of subjects to something like 32767: ( I was theorizing to build a system that would hold something like 7 billion unique subjects :) What a yml file that would be :P