Method and apparatus for detecting printed images on documents b

Details Method and apparatus for detecting printed images on documents b Method and apparatus for detecting printed images on documents b

1993-08-20

1996-01-09

Couso, Jose L.

Image analysis

Applications

Reading paper currency

382317, 194328, G06K 900

Patent

active

054836026

ABSTRACT:
In order to detect security documents irrespective of their individual graphic designs, a method and apparatus are provided in which the presence of certain structural elements common to a variety of different security documents are analyzed without analyzing the whole printed image or comparing it for identity with the stored printed image. For example, the structural elements may be curved colored lines present in a certain minimum density of a surface, or intertwined line structures known as guilloches. The document to be copied is scanned as in any normal copying operation and the structural elements identified by electronic pattern recognition in order to determine whether copying is to be permitted, without requiring additional detection elements.

REFERENCES:
patent: 4349111 (1982-09-01), Shah et al.
patent: 4723149 (1988-02-01), Harada
patent: 4837840 (1989-06-01), Goldman
patent: 4881268 (1989-11-01), Uchida et al.
patent: 5216724 (1993-06-01), Suzuki et al.
patent: 5257119 (1993-10-01), Funada et al.
patent: 5321470 (1994-06-01), Hasuo et al.

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