Face recognition is one of the few biometric methods that possess the merits of both high accuracy and low intrusiveness. Biometric requires no physical interaction on behalf of the user. Biometric allows to perform passive identification in a one to many environments. Passwords and PINs are hard to remember and can be stolen or guessed; cards, tokens, keys and the like can be misplaced, forgotten, purloined or duplicated; magnetic cards can become corrupted and unreadable. However individuals biological traits cannot be misplaced, forgotten, stolen or forged.