Face recognition appears to offer several advantages over
other biometric methods, a few of which are outlined here:
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a) Almost all these technologies require some
voluntary action by the user, i.e., the user needs to place
his hand on a hand-rest for fingerprinting or hand
geometry detection and has to stand in a fixed position in
front of a camera for iris or retina identification. However,
face recognition can be done passively without any
explicit action or participation on the part of the user since
face images can be acquired from a distance by a camera.
This is particularly beneficial for security and surveillance
purposes.