Is there any suggestion for calculating the threshold to accept or reject a person in biometrics?

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Tapan P Gondaliya

http://www.mecs-press.org/ijigsp/ijigsp-v6-n2/IJIGSP-V6-N2-6.pdf

check this paper may be this paper is useful to you...

Indu Sreedevi

Biometric systems are generally used in real time systems. The methodology used in the system should be computationally light and fast. The system should be reliable. These systems will have limited memory.

Hence the threshold calculation definitely depends on the biometric features being considered.