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Publication numberEP0744716 A3
Publication typeApplication
Application numberEP19960303493
Publication date18 Dec 1996
Filing date16 May 1996
Priority date25 May 1995
Also published asDE69605854D1, DE69605854T2, EP0744716A2, EP0744716B1
Publication number1996303493, 96303493, 96303493.9, EP 0744716 A3, EP 0744716A3, EP-A3-0744716, EP0744716 A3, EP0744716A3, EP19960303493, EP96303493
InventorsHeather L. Cumming
ApplicantNcr International Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: Espacenet, EP Register
Method and apparatus for authenticating documents
EP 0744716 A3
Abstract
In a method and apparatus for authenticating documents, at least one small area (22) on a document (12) being tested is sensed by a spectroscope (26), and the light intensity at a plurality (e.g. 50) of spectral points is measured by a photodiode array (30). The resulting signals are digitized in an analog-to-digital converter (38) and the resulting data is stored. This data is then analyzed by discriminant analysis, whereby the intensity values treated as components of a vector are multiplied by one or more sets of weighting coefficients (discriminant functions) to provide a set of discriminant function values. A distance measurement between this set of values and the centroid of a corresponding set of values for genuine documents is compared with a threshold value to determine the authenticity of the document (12).
Description  available in
Claims  available in
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4526466 *1 Sep 19832 Jul 1985Rca CorporationTechnique for verifying genuineness of authenticating device
US4577235 *20 Aug 198418 Mar 1986The Mead CorporationText/continuous tone image decision processor
US5304813 *6 Oct 199219 Apr 1994Landis & Gyr Betriebs AgApparatus for the optical recognition of documents
US5392364 *20 May 199221 Feb 1995Matsushita Electric Industrial Co., Ltd.Object inspection method employing selection of discerning features using mahalanobis distances
WO1985002928A1 *27 Dec 19834 Jul 1985Bergstroem ArneApparatus for authenticating bank notes
Classifications
International ClassificationG07D7/12, G07D7/00, G06T7/00
Cooperative ClassificationG07D7/00
European ClassificationG07D7/00
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