EP 0843860 A4 20010307 - OPTICAL IMAGE AUTHENTICATOR
Title (en)
OPTICAL IMAGE AUTHENTICATOR
Title (de)
AUTHENTIFIZIERUNG VON OPTISCHEN BILDERN
Title (fr)
AUTHENTIFICATEUR D'IMAGES OPTIQUES
Publication
Application
Priority
- AU 9600498 W 19960807
- AU PN462995 A 19950807
Abstract (en)
[origin: WO9706502A1] Optical Image Authenticator and method where a light intensity pixel array is detected and compared with a reference pixel array on a pixel by pixel basis to determine if each pixel is either good or bad. Authentication is done on the basis of the number of good/bad pixel's or their ratio. Pixel's are assigned a grey scale value or a binary value. Values are allocated with respect to different threshold levels. The optical memory can be a pixilated diffraction grating or "pixelgram". Detection is via a CCD sensor and a laser pulses every frame. Detected pattern starting point position is matched with the respective positions in the authentic pattern. The authentic pattern is stored in a variety of forms which have been rotated or linearly translated. For use in the field of securities and credit cards.
IPC 1-7
IPC 8 full level
G06K 7/10 (2006.01); G06K 7/12 (2006.01); G06K 9/64 (2006.01); G06K 17/00 (2006.01); G06K 19/06 (2006.01); G06K 19/10 (2006.01); G07D 7/00 (2006.01); G07D 7/06 (2006.01)
CPC (source: EP US)
G06K 7/1092 (2013.01 - EP US); G06V 10/751 (2022.01 - EP US)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 9706502A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9706502 A1 19970220; AU PN462995 A0 19950831; CA 2226321 A1 19970220; EP 0843860 A1 19980527; EP 0843860 A4 20010307; JP H11510283 A 19990907
DOCDB simple family (application)
AU 9600498 W 19960807; AU PN462995 A 19950807; CA 2226321 A 19960807; EP 96925610 A 19960807; JP 50795897 A 19960807