Optics: measuring and testing – Document pattern analysis or verification
Patent
1975-12-12
1977-10-11
Corbin, John K.
Optics: measuring and testing
Document pattern analysis or verification
3401463E, 356168, G06K 908, G01B 1124, G06K 900
Patent
active
040532283
ABSTRACT:
A fingerpress is formed by pressing a finger against the back surface of a transparent glass plate and holding it in a predetermined position thereon. This fingerpress is interrogated by a light beam directed through the front surface of the glass plate. The interrogating beam is partially reflected at the back surface to provide a signal beam carrying fingerpress information. The signal beam is created by virtue of the optical discontinuity between the glass plate and the fingerpress. There is one discontinuity between the glass plate and the air underlying the valleys of the fingerpress and another discontinuity between the glass plate and the finger oil at the crests of the fingerpress. The two discontinuities cause differing amounts of light to be reflected and the signal beam is thus created. The signal beam is correlated against a hologram of the same fingerpress to provide identification. The hologram is created either from a film image of the fingerpress or from the fingerpress in real time. The finger is held in predetermined registration position both in making the hologram, or film on which the hologram is made, and when being interrogated for identification so that correlation can be properly made. The front surface of the glass plate is coated with an anti-reflectant coating and the back surface is coated with a coating to enhance the difference in reflectivity of the valleys and crests of the fingerpress.
REFERENCES:
patent: 3138059 (1964-06-01), White
patent: 3716301 (1973-02-01), Caulfield et al.
patent: 3743421 (1973-07-01), Maloney
Corbin John K.
Levy Stewart
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