Record document authentication by microscopic grain structure an

Details Record document authentication by microscopic grain structure an Record document authentication by microscopic grain structure an

1992-05-11

1994-06-28

Warden, Robert J.

Optics: measuring and testing

Document pattern analysis or verification

235380, 235468, 235494, 34082534, G06K 710, G06K 974, G06K 1906, G07D 700

Patent

active

053251679

ABSTRACT:
Record document may be authenticated against reference grain data obtained from the document at a prior time. The body of the document is formed by base medium bearing the record entries such as text within record site. Grain seal site is located at a predetermined location within the base medium. The unique grain structure within the seal site are microscopic and function as a seal for authenticating the document. The seal site is initially scanned to provide a stream of reference data generated by the surface reflection of the grain structure. This reference grain data is stored in memory for future authentication use. The seal site is then currently scanned to generate a stream of current grain data for comparison to the reference grain data.

REFERENCES:
patent: 4423415 (1983-12-01), Goldman
patent: 4547896 (1985-10-01), Ohtombe et al.
patent: 4675669 (1987-06-01), Goldman

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