EP4295252

• trinamiX GmbHsince Nov 24, 2023

A method for face authentication is proposed. The method comprising the following steps: a) at least one face detection step (110) comprising determining at least one first image by using at least one camera (112); b) at least one skin detection step (116) comprising projecting at least one illumination pattern comprising a plurality of illumination features on the scene by using at least one illumination unit (118), determining at least one second image using the at least one camera (112), determining a first beam profile information of at least one of the reflection features located inside an image region of the second image corresponding to an image region of the first image comprising the identified geometrical feature by analysis of its beam profile, and determining at least one material property of the reflection feature from the first beam profile information by using the processing unit (114), wherein the detected face is characterized as skin if the material property corresponds to at least one property characteristic for skin; c) at least one 3D detection step (120) comprising determining a second beam profile information of at least four of the reflection features located inside the image region of the second image corresponding to the image region of the first image comprising the identified geometrical feature by analysis of their beam profiles and determining at least one depth level from the second beam profile information of said reflection features by using the processing unit (114), wherein the detected face is characterized as 3D object if the depth level deviates from a pre-determined or pre-defined depth level of plane objects; d) at least one authentication step (122) comprising authenticating the detected face by using at least one authentication unit if in step b) (116) the detected face is characterized as skin and in step c) (120) the detected face is characterized as 3D object.

From the international application WO2022175386