Detection of fraud for access control system of biometric type

摘要

The invention relates to a method of detecting fraud for an access control system using biometric recognition, comprising the steps consisting in: taking at least two images (S2) of a face presented to the access control system by an individual (I) according to at least two positions of the individual in front of the access control system, or two angles of picture-taking of the individual, processing these two images to determine a score representative of the flatness of the face appearing on the images, and as a function of this flatness score, detecting a possible fraud on the part of the individual, said detection conditioning the implementation of an identification processing of the individual by the access control system. The invention also relates to an access control system implementing said method.

主权项

1. A method of fraud detection for an access control system via biometric recognition, comprising the steps:
taking at least two images (S2) of a face presented to the access control system by an individual (I) according to at least two positions of the individual in front of the access control system, or two angles of vision of the individual, extracting the face from each of the images, processing the at least two images to determine a score representative of a flatness of the face appearing on the images, and as a function of the flatness score, detecting any fraud on the part of the individual, said detection conditioning the use of identification treatment of the individual by the access control system,wherein the step for determination of a score representative of the flatness of the face comprises the steps:
creating a depth map of the face of the individual (I), estimating a median plane of the map of the face, and calculating the variance of the points of the map of the face relative to said median plane of the map of the face, isolating from the images a block of the face centred on a nose of the individual, creating a depth map of said block, estimating a median plane of the map of said block, and calculating the variance of the points of the map of said block relative to said median plane of the map of said block, and obtaining a flatness score of the face by linear combination of the variances of the points of the depth maps relative to the respective median planes.