Just as with fingerprint and voice scan biometrics, there are various methods by which facial recognition technology recognizes people. All share certain commonalities, such as emphasizing those sections of the face which are less susceptible to alteration, including the upper outlines of the eye sockets, the areas surrounding one's cheekbones, and the sides of the mouth. Most technologies are resistant to moderate changes in hairstyle, as they do not utilize areas of the face located near the hairline. All of the primary technologies are designed to be robust enough to conduct 1-to-many searches, that is, to locate a single face out of a database of thousands, even hundreds of thousands, of faces.

 

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The most comprehensive and up-to-date information on facial recognition technology - the market, technology and applications - can be found in IBG's authoritative report on the "State of Facial Recognition Technology."