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detect unknown image and confidence level in ios

I am working in face recognition tutorial with LBPHFaceRecognizer. I am currently suffering two issues.

  1. First time I am getting "No match found" but Once I store face then any user is detected with that face and get confidence level. But i need it to declare "Unknown person".

  2. Same person's image confidence level is coming between 50-70. I know lesser = better but I think for same person it will come with 0-20.

I really appreciate if anyone can help me out of here.