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

Claim 4:
5. A system for authenticating a digital image representative of an identity document (ID), the system comprising:
a processor;
a memory storing instructions that, when executed by the processor, cause the processor to implement; a texture information generator configured to generate, 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;
said texture information generator being configured to:
detect, for a target manipulation space, one or more features of interest of the ID;
define the one or more select local blocks of the ID based on the detected one or more features of interest; and
extract, based on the digital image, texture information at each of the one or more select local blocks to generate the one or more local texture patches; and

a detector configured to detect the presence of a forgery in the digital image based on the global texture profile or 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, and wherein the one or more select local blocks comprise one or more blocks straddling a boundary of the portrait photo.