EP 1319219 A1 20030618 - METHOD FOR PREVENTING COUNTERFEITING OR ALTERATION OF A PRINTED OR ENGRAVED SURFACE
Title (en)
METHOD FOR PREVENTING COUNTERFEITING OR ALTERATION OF A PRINTED OR ENGRAVED SURFACE
Title (de)
VERFAHREN ZUR VORBEUGUNG DER VERFÄLSCHUNG ODER ÄNDERUNG VON BEDRUCKTEN ODER GRAVIERTEN FLÄCHEN
Title (fr)
PROCEDE DESTINE A PREVENIR LA CONTREFAÇON OU L'ALTERATION D'UNE SURFACE IMPRIMEE OU GRAVEE
Publication
Application
Priority
- CH 0100560 W 20010917
- CH 18322000 A 20000920
Abstract (en)
[origin: EP2261867A2] A 'fragile' signature in the form of a numerical watermark is incorporated in a part or whole of the document. The watermark has asymmetric modulation of amplitude of a visible or invisible component. To detect the presence or absence of the signature the surface has to be of uniform color. Pre-treatment of the image is carried out in order to eliminate visible printed or engraved data which does not contain the watermark. During searching for the signature the image defining the original surface is predicted from the image of the signed surface. The signature can also be printed so that it is visible on the surface. During searching for the signature the numerical watermark is digitized by a scanner, or portable device. The non visible property of the ink is used to form the asymmetric modulation. Different signatures can be hidden in different regions of the surface.
IPC 1-7
IPC 8 full level
G07D 7/004 (2016.01); G07D 7/005 (2016.01)
CPC (source: EP US)
G07D 7/004 (2013.01 - EP US); G07D 7/0056 (2017.05 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0225599 A1 20020328; AT E488822 T1 20101215; CN 1252653 C 20060419; CN 1475001 A 20040211; DE 60143487 D1 20101230; DK 1319219 T3 20110221; EP 1319219 A1 20030618; EP 1319219 B1 20101117; EP 2261867 A2 20101215; EP 2261867 A3 20121219; EP 2261867 B1 20180718; ES 2356598 T3 20110411; US 2004013285 A1 20040122; US 7684088 B2 20100323
DOCDB simple family (application)
CH 0100560 W 20010917; AT 01964793 T 20010917; CN 01818814 A 20010917; DE 60143487 T 20010917; DK 01964793 T 20010917; EP 01964793 A 20010917; EP 10174049 A 20010917; ES 01964793 T 20010917; US 38091403 A 20030804