device for quick automatic comparison of two patterns, in particular for the comparison of two fingerprints.

摘要

A method and apparatus for rapid automatic comparison of two patterns, such as fingerprints, each of which may be randomly located and oriented within some bounded area. The patterns, or portions thereof, are optically superimposed and rapidly scanned with respect to each other in a rotated scan pattern. Reflected or transmitted incoherent radiance is sensed to provide a measure of the correlation between the two patterns. Logic circuitry including a threshold decision function signifies pattern identity or dissimilarity by activating a panel light, audible signal or other suitable indicator. Optical baffling and spatial and electronic filtering enhance correlation signal discrimination and supress spurious modulation responses.