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the desired threshold value depends on a number of factors:
the algorithm you choose. ( fisher/eigen/lbp FaceRecognizers all have differently sized feature-spaces and use different norms to evaluate the comparison )
your face-db. yes, you need to have it almost complete(say, full), to determine a value, that makes sense.
as for the last topic, how to find if an img is already in the db : this is much easier, it will come out with (almost) zero distance.
