An apparatus for real-time pattern comparison based on the interference method proposed by Weinberger and Almi is described. Particular emphasis is stressed on its use in fingerprint identification. Preliminary experiments confirmed that the apparatus is feasible for the purpose.
Tadao Tsuruta, Yoshinobu Itoh, and Hiroshi Shirasu, "Pattern Comparison by Interference Fringe Scanning," Appl. Opt. 13, 1089-1092 (1974)