Method for identifying a person and acquisition device
View Patent ↗A method for identifying a person ( 200 ) by capturing an image of the iris producing an anamorphic transformation of the image along a horizontal axis and then a vertical axis to code it in the form of one or two models. The model is compared with reference models stored in a database to determine the identity of the person. The acquisition device captures the image of the iris through means of optical deformation to produce the anamorphic transformation of the image and then codes the image into the models.
1. A method ( 200 ) of identifying a person implemented by using an acquisition device ( 150 ) and comprising:
(a) a step ( 202 ) of capturing an image of the irises ( 102 ) of the person through optical deformation means ( 160 ) by the acquisition device ( 150 ) which effects an anamorphic transformation of the image of the irises ( 102 ) along a first axis that passes through the centers of the two irises ( 102 ) of the person and along a second axis perpendicular to the first axis;
(b) a step ( 204 ) of processing the image thus captured so as to code it in the form of two models;
(c) a step ( 206 ) of comparing the models thus obtained with reference models contained in storage means ( 156 ); and
(d) a decision-taking step ( 208 ) concerning the identity of the person from the result of the comparison step ( 206 ).
2. The identification method ( 200 ) according to claim 1 , wherein, during the processing step ( 204 ) and prior to the coding of the image, the captured image is processed so as to reverse the effects of the deformation means( 160 ).
3. The acquisition device ( 150 ) for implementing an identification method according to claim 1 and comprising:
(a) a capture means ( 152 ) designed to capture an image of the irises ( 102 ) of a person;
(b) a processing means ( 154 );
(c) a storage means ( 156 );
(d) a comparison means ( 158 );
(e) a decision-taking means ( 164 ); and
(f) a means ( 160 ) of optical deformation between the capture means ( 152 ) and the irises ( 102 ) that are designed to effect an anamorphic transformation of the image of the irises ( 102 ) before its capture, the anamorphic transformation taking place along a first axis that passes through the centers of the two irises ( 102 ) of the person and along a second axis perpendicular to the first axis.
4. The acquisition device ( 150 ) for implementing an identification method according to claim 2 and comprising:
a. a capture means ( 152 ) designed to capture an image of the irises ( 102 ) of a person;
b. a processing means ( 154 );
c. a storage means ( 156 );
d. a comparison means ( 158 );
e. a decision-taking means ( 164 );
f. a means ( 160 ) of optical deformation between the capture means ( 152 ) and the irises ( 102 ) that are designed to effect an anamorphic transformation of the image of the irises ( 102 ) before its capture, the anamorphic transformation taking place along a first axis that passes through the centers of the two irises ( 102 ) of the person and along a second axis perpendicular to the first axis; and
g. the processing means ( 154 ) is designed to subject to the captured image an anamorphic transformation that is the reverse of that generated by the optical deformation means ( 160 ).
5. The acquisition device ( 150 ) according to claim 3 , wherein the coefficient of the anamorphic transformation along the first axis is lower than the coefficient of the transformation along the second axis.
6. The acquisition device ( 150 ) according to claim 5 , wherein the coefficient of the anamorphic transformation along the first axis is lower than the coefficient of the transformation along the second axis.