EP 0744716 A3 19961218 -
Publication
Application
Priority
GB 9510678 A 19950525
Abstract (en)
[origin: EP0744716A2] 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). <IMAGE>
IPC 1-7
IPC 8 full level
G06T 7/00 (2006.01); G07D 7/00 (2006.01); G07D 7/12 (2006.01)
CPC (source: EP US)
G07D 7/1205 (2017.04 - EP US)
Citation (search report)
- [X] US 5304813 A 19940419 - DE MAN IVO [CH]
- [A] US 4577235 A 19860318 - KANNAPELL HENRY N [US], et al
- [A] US 4526466 A 19850702 - SANDERCOCK JOHN R [CH]
- [A] US 5392364 A 19950221 - YOKOYAMA HARUHIKO [JP], et al
- [A] WO 8502928 A1 19850704 - BERGSTROEM ARNE [SE]
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0744716 A2 19961127; EP 0744716 A3 19961218; EP 0744716 B1 19991229; DE 69605854 D1 20000203; DE 69605854 T2 20000720; ES 2140787 T3 20000301; GB 9510678 D0 19950719; JP H0916777 A 19970117; ZA 963604 B 19960823
DOCDB simple family (application)
EP 96303493 A 19960516; DE 69605854 T 19960516; ES 96303493 T 19960516; GB 9510678 A 19950525; JP 12535296 A 19960521; ZA 963604 A 19960507