EP 1526972 A2 20050504 - METHOD FOR CHECKING AUTHENTICITY OF A SECURITY ELEMENT

Title (en)

METHOD FOR CHECKING AUTHENTICITY OF A SECURITY ELEMENT

Title (de)

VERFAHREN ZUR ECHTHEITSPRÜFUNG EINES SICHERHEITSELEMENTS

Title (fr)

PROCEDE D'EVALUATION DE L'AUTHENTICITE D'UN ELEMENT DE SECURITE

Publication

EP 1526972 A2 20050504 (DE)

Application

EP 03771090 A 20030724

Priority

DE 10233928 A 20020725
EP 0308135 W 20030724

Abstract (en)

[origin: WO2004011273A2] The invention relates to a method whereby a difference image is generated from two images taken of a security element, using right- and left-circular polarising filters and which is used to check the authenticity of the security element and a device for carrying out the above method.

IPC 1-7

B42D 15/00; G07D 7/12

IPC 8 full level

G07D 7/12 (2006.01); G07D 7/20 (2006.01)

CPC (source: EP US)

B42D 25/364 (2014.10 - US); B42D 25/391 (2014.10 - EP US); G07D 7/0034 (2017.04 - EP US); G07D 7/121 (2013.01 - EP US); G07D 7/206 (2017.04 - EP US); B42D 2033/26 (2022.01 - EP); B42D 2035/20 (2022.01 - EP)

Citation (search report)

See references of WO 2004011273A2

Citation (examination)

US 6301047 B1 20011009 - HOSHINO HIDEKAZU [JP], et al
EP 0911758 A2 19990428 - NHK SPRING CO LTD [JP]
EP 1028359 A1 20000816 - NIPPON MITSUBISHI OIL CORP [JP], et al
DON PEARSON: "IMAGE PROCESSING", 1991, MCGRAW-HILL BOOK COMPANY, LONDON
JOHN G. WEBSTER: "Wiley Encyclopedia of Electrical and Electronics Engineering, Volume 3", 1999, JOHN WILEY & SONS, NEW YORK

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

WO 2004011273 A2 20040205; WO 2004011273 A3 20040318; AU 2003257496 A1 20040216; AU 2003257496 B2 20080515; CA 2493211 A1 20040205; CN 100540328 C 20090916; CN 1668478 A 20050914; DE 10233928 A1 20040212; EP 1526972 A2 20050504; JP 2005534112 A 20051110; US 2006124741 A1 20060615; US 7537161 B2 20090526

DOCDB simple family (application)

EP 0308135 W 20030724; AU 2003257496 A 20030724; CA 2493211 A 20030724; CN 03816668 A 20030724; DE 10233928 A 20020725; EP 03771090 A 20030724; JP 2004523785 A 20030724; US 52223105 A 20050907