Method for Identifying and/or Authenticating an Individual by Iris Recognition

摘要

The present invention relates to a method for identifying and/or authenticating an individual comprising the following steps performed by a system comprising a storage device storing at least one binary code of a reference iris and a binary code of an associated reference mask:
acquisition 101 of an image of an eye of the individual,segmentation 102 of the acquired image of the eye so as to isolate a region containing the texture of the iris and determine an associated mask,division 103 of said region containing the iris texture and of said mask into N2 of concentric rings,normalization 104 of said region containing the texture of the iris and of said mask of Cartesian coordinates in polar coordinates,determination 105 of a binary iris code IC of size equal to N2*P*F and a binary code of mask IM associated by application of F Gabor filters to each position of P positions of each ring,matching 106 at least one ring of the iris of the acquired image with a ring of the reference iris so as to minimize a matching distance (HDviterbi) between the acquired image and the reference image, said matching distance being obtained from the determined and stored reference iris codes and the associated mask codes by computing a sum of distances (Dist) between each of said rings of the matched acquired image iris and the ring of the reference iris which corresponds to it,computation 107 of the minimized matching distance,identification and/or authentication of the individual 108 if said minimized matching distance is less than a predetermined threshold.

主权项

1. A method for identifying and/or authenticating an individual comprising the following steps performed by a system for identifying and/or authenticating an individual,
said system for identifying and/or authenticating an individual comprising a storage device storing at least one binary code of a reference iris obtained from a reference iris image divided into a first predetermined number N1 of concentric rings, and a binary code of associated reference mask identifying regions of the reference iris in which eyelids, eyelashes, reflections or other sources of noise have been detected: acquisition of an image of an eye of the individual to be identified and/or authenticated, segmentation of the acquired image of the eye so as to isolate a region containing the texture of the iris and determine an associated mask, division of said region containing the iris texture and of said mask into a second number N2 of concentric rings, normalization of said region containing the texture of the iris and of said mask of Cartesian coordinates into polar coordinates, determination of a binary iris code IC of size equal to N2*P*F coding said region containing the texture of the normalized iris and a binary code of mask IM of size equal to N2*P*F coding the associated mask, by application of a third predetermined number of Gabor filters F to each position from a fourth predetermined number P of positions of each ring, matching at least one ring of the iris of the acquired image with a ring of one of said reference irises so as to minimize a matching distance between the acquired image and the reference image, said matching distance being obtained from the determined and stored reference iris codes and the associated mask codes by computing a sum of distances between each of said rings of the matched acquired image iris and the ring of the reference iris which corresponds to it, computation of said minimized matching distance, identification and/or authentication of the individual if said minimized matching distance is less than a predetermined threshold.