Patent ID: 11872832
Assignee: IDEMIA IDENTITY & SECURITY FRANCE
Field: Computer technology (Electrical engineering)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A method for authenticating a digital image representative of an identity document (ID), comprising:
generating, based on the digital image, one or more local texture patches representative of texture information of one or more select local blocks of the ID, by:
detecting, for a target manipulation space, one or more features of interest of the ID;
defining the one or more select local blocks of the ID based on the detected one or more features of interest; and
extracting, based on the digital image, texture information at each of the one or more select local blocks of the ID to generate the one or more local texture patches; and

detecting the presence of a forgery in the digital image based on the one or more local texture patches;
wherein the target manipulation space is physical portrait photo substitution, wherein the one or more features of interest comprise a portrait photo of the ID; wherein the one or more select local blocks of the ID comprise one or more blocks straddling a boundary of the portrait photo.