EP 1264268 A1 20021211 - METHODS AND SYSTEMS USING MULTIPLE WATERMARKS
Title (en)
METHODS AND SYSTEMS USING MULTIPLE WATERMARKS
Title (de)
MEHRER WASSERZEICHEN ANWENDENDE SYSTEME UND VERFAHREN
Title (fr)
PROCEDES ET SYSTEMES UTILISANT DE MULTIPLES FILIGRANES
Publication
Application
Priority
- US 0029454 W 20001025
- US 43310499 A 19991103
- US 23478099 A 19990120
Abstract (en)
Two parameters related to fine and coarse grained watermarks in a document are sensed. Another parameter related to wear of the document is sensed. The document is assessed whether it is an original document by referring the three sensed parameters. Independent claims are also included for the following: (a) Document authenticity determining apparatus; (b) Document.
IPC 1-7
IPC 8 full level
G06K 9/00 (2006.01); G06T 1/00 (2006.01); G06T 7/00 (2006.01)
CPC (source: EP)
G06T 1/0071 (2013.01); G06T 7/0002 (2013.01); G06T 2201/0083 (2013.01)
Citation (search report)
See references of WO 0133495A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 00973864 A 20001025; AU 1232001 A 20001025