Secure document identification technique

Details Secure document identification technique Secure document identification technique

1983-09-21

1987-04-28

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

235380, 235487, 235494, 283 74, 34082534, 35016220, 356 71, G06K 900

Patent

active

046619836

ABSTRACT:
A random-pattern of microscopic lines that inherently forms in a dielectric coating layer of a 3-layer diffractive subtractive filter authenticating device incorporated in a secure document permits identification of a genuine individual document by comparing read-out line-position information derived by microscopic inspection with read-out digital codes of line-information obtained earlier at the time of fabrication of the document. The technique can also be used with an artificially generated random pattern of lines in the case of other types of authenticating devices that do not inherently form such a pattern.

REFERENCES:
patent: 4034211 (1977-07-01), Horst et al.
patent: 4150781 (1979-04-01), Silverman et al.
patent: 4417784 (1983-12-01), Knop et al.
patent: 4450348 (1984-05-01), Stockburger et al.
patent: 4476468 (1984-10-01), Goldman
patent: 4484797 (1984-11-01), Knop et al.
patent: 4493107 (1985-01-01), Stockburger et al.
patent: 4527051 (1985-07-01), Stenzel

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