With airports tightening up security, biometric technologies such as face recognition may come on line. A few techniques exist to match known facial profiles against those of strangers in a crowd or to verify a person's claimed identity, as at an ATM. But two stand out: local feature analysis, developed by Joseph Atick, who founded Jersey City, NJ-based Visionics; and eigenface, first demonstrated at Helsinki University of Technology, later developed at MIT, and currently marketed by Viisage Technology of Littleton, MA.

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