EP-4740123-A1 - SECURE FACE AUTHENTICATION

Abstract

A method for authenticating a user of a device comprising an illumination source, the method comprising: a) receiving a visible light image showing the object while the object is illuminated with visible light, b) receiving an IR pattern image showing the object while the object is illuminated with an infrared light pattern emitted from the illumination source, c) determining if a material indicator associated with the object shown in the IR pattern image corresponds to a living organism, in particular by providing the IR pattern image to an IR data-driven model parametrized based on an IR training data set comprising at least one training IR pattern image and at least one training material indicator, wherein the IR data-driven model provides a material indicator based on the IR pattern image, d) determining if the object shown in the visible light image corresponds to an authorized user, and, e1) allowing the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to an authorized user and determining that the material indicator corresponds to a living subject, or e2) declining the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to an unauthorized object and/or the material indicator corresponding to a non-living subject.

Inventors

• WIPFLER, Nicolas
• SCHILLEN, Peter
• HERMES, Wilfried
• SCHINDLER, PATRICK
• KNAPP, STEPHAN

Assignees

• trinamiX GmbH

Dates

Publication Date

20260513

Application Date

20240701

Claims (15)

1. 1 . A method for authenticating a user of a device comprising an illumination source, the method comprising: a) receiving a visible light image showing the object while the object is illuminated with visible light, b) receiving an IR pattern image showing the object while the object is illuminated with an infrared light pattern emitted from the illumination source, c) determining if a material indicator associated with the object shown in the IR pattern image corresponds to a living organism, in particular by providing the IR pattern image to an IR data- driven model parametrized based on an IR training data set comprising at least one training IR pattern image and at least one training material indicator, wherein the IR data-driven model provides a material indicator based on the IR pattern image, d) determining if the object shown in the visible light image corresponds to an authorized user, and, e) allowing the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to an authorized user and determining that the material indicator corresponds to a living organism, otherwise declining the object to access at least one function of the device.
2. 2. The method according to any one of the preceding claims, wherein determining if a material indicator associated with the object corresponds to a living object comprises determining if at least a part of the object shown in the IR pattern image comprises skin and wherein the material indicator corresponds to a living organism if the object comprises skin.
3. 3. The method according to claim 3, wherein determining if at least a part of the object shown in the IR pattern image comprises skin includes determining the material indicator and comparing the material indicator with a reference material indicator, and wherein the object shown in the IR pattern image comprises skin if the determined material indicator is within a range specified by the reference material indicator.
4. 4. The method according to any one of the preceding claims, further including generating the IR pattern image by a first camera and/or generating the visible light image generated by a second camera.
5. 5. The method according to claim 4, wherein the first camera and/or the second camera are covered at least partially by a display, and wherein the device is a display device comprising the display.
6. 6. The method according to claim 4 and 5, further including darkening at least a part of the display covering the illumination source during illumination and/or the first camera during generating the IR pattern image and/or the second camera during generating the visible light image.
7. 7. The method according to claim 4 to 6, wherein the second camera is a RGB camera and/or a selfie camera of the device.
8. 8. The method according to any one of the preceding claims, wherein the visible light is emitted independently from the illumination source of the device.
9. 9. The method according to any one of the preceding claims, wherein the visible light is ambient light and/or, wherein the visible light is emitted from a display of the device being a display device and comprising a display and/or wherein the visible light is emitted from a flashlight of the device.
10. 10. The method according to any one of the preceding claims, wherein determining if the object shown in the visible light image corresponds to an authorized user is based on image recognition.
11. 11. The method according to claim 10, wherein performing image recognition comprises determining at least one object feature based on the visible light image and matching the at least one object feature with at least one template feature.
12. 12. The method according to any one of the preceding claims, wherein the display provides feedback associated with the visible light image and/or the IR pattern image in response to allowing or declining the object to access at least one function of the device.
13. 13. A device for authenticating a user, the device comprising: a) an interface configured for receiving a visible light image showing the object while the object is illuminated with visible light and receiving an IR pattern image showing the object while the object is illuminated with an infrared light pattern emitted from the illumination source, b) a processor configured for determining if a material indicator associated with the object corresponds to a living organism, in particular by providing the IR pattern image to an IR data- driven model parametrized to output a material indicator in response to being provided with the IR pattern image based on an IR training data set comprising at least one training IR pattern image and at least one material indicator, and, determining if the object shown in the visible light image corresponds to an authorized object, and, allowing the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to an authorized user and determining that the material indicator corresponds to a living organism, otherwise, declining the object to access at least one function of the device.
14. 14. Use of a device according to claim 13 for authenticating a user.
15. 15. A computer program element with instructions, which when executed on a processing device is configured to carry out the steps of the method of any one of claims 1 to 12. 5

Description

SECURE FACE AUTHENTICATION TECHNICAL FIELD The invention relates a device and/or a system for authenticating a user, a method for authenticating an user, a use of a device, a computer program element, a non-transitory computer-readable data medium TECHNICAL BACKGROUND An object can be authenticated based on an IR image. Such an IR image is generated while the object is illuminated with flood IR illumination. This IR image is then provided to recognition models trained for detecting and recognizing an authorized user. These detection and recognition models are trained with large datasets comprising a plurality of visible light images. Hence, the performance ef face authentication algorithms operating on IR images is decreased. SUMMARY In an aspect, the disclosure relates to a method for authenticating a user of a device comprising an illumination source, the method comprising: a) receiving a visible light image showing the object while the object is illuminated with visible light, b) receiving an IR pattern image showing the object while the object is illuminated with an infrared light pattern emitted from the illumination source, c) determining if a material indicator associated with the object shown in the IR pattern image corresponds to a living organism, in particular by providing the IR pattern image to a IR data-driven model parametrized based on an IR training data set comprising at least one training IR pattern image and at least one training material indicator, wherein the IR data-driven model provides a material indicator based on the IR pattern image, d) determining if the object shown in the visible light image corresponds to an authorized user, and, e1) allowing the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to an authorized user and determining that the material indicator corresponds to a living organism, or e2) optionally, declining the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to an unauthorized object and/or the material indicator corresponding to a non-living organism. In another aspect, the disclosure relates to a method for authenticating a user of a device comprising an illumination source, the method comprising: a) receiving a visible light image showing the object while the object is illuminated with visible light, b) receiving an IR pattern image showing the object while the object is illuminated with an infrared light pattern emitted from the illumination source, c) determining if a material indicator associated with the object shown in the IR pattern image corresponds to a living organism, in particular by providing the IR pattern image to an IR data-driven model parametrized based on an IR training data set comprising at least one training IR pattern image and at least one training material indicator, wherein the IR data-driven model provides a material indicator based on the IR pattern image, d) determining if the object shown in the visible light image corresponds to an authorized user, and, e) allowing the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to an authorized user and determining that the material indicator corresponds to a living organism, otherwise declining the object to access at least one function of the device. In an aspect, the disclosure relates to a method for authenticating a user of a device comprising an illumination source, the method comprising: a) receiving a visible light image showing the object while the object is illuminated with visible light, b) receiving an IR pattern image showing the object while the object is illuminated with an infrared light pattern emitted from the illumination source, c) determining if a material indicator associated with the object shown in the IR pattern image corresponds to a living organism, in particular by providing the IR pattern image to an IR data-driven model parametrized based on an IR training data set comprising at least one training IR pattern image and at least one training material indicator, wherein the IR data-driven model provides a material indicator based on the IR pattern image, d) determining if the object shown in the visible light image corresponds to an authorized user, and, e1) allowing the object to access at least one function of the device based on determining that the object shown in the visible light image corresponds to the authorized user and determining that the material indicator corresponds to the living organism, or e2) optionally, declining the object to access at least one function of the device based on determining that the object shown in the visible light image does not correspond to the authorized object and/or the material indicator does not correspond to the living organism. In another aspect, it relates to a