Anti-spoofing face id sensing

Patent metadata

Field	Value
Publication number	US-2020226237-A1
Application number	US-201916361197-A
Country	US
Kind code	A1
Filing date	Mar 21, 2019
Priority date	Jan 16, 2019
Publication date	Jul 16, 2020
Grant date	—

Abstract

A security check system using face ID sensing for secure access to an electronic platform includes a camera. The camera includes an imaging lens configured to form a modulated image of an object positioned in front of the camera. The modulated image of the object includes deviations from an ideal image. The security check system further includes a computer memory configured to store face ID data of an authorized person. The face ID data is generated from one or more modulated images of a live face of the authorized person acquired by the camera during a registration process. The security check system further includes a processing module configured to analyze the modulated image of the object to extract facial signatures, compare the facial signatures to the face ID data, and determine whether the object is the live face of the authorized person based on the comparison.

First claim

What is claimed is:

1 . A security check system using face ID sensing for secure access to an electronic platform, the security check system comprising:
a camera comprising an imaging lens configured to form a modulated image of an object positioned in front of the camera, the modulated image of the object including deviations from an ideal image; a computer memory configured to store face ID data of an authorized person, the face ID data being generated from one or more modulated images of a live face of the authorized person acquired by the camera during a registration process; and a processing module coupled to the camera and the computer memory, the processing module configured to:
analyze the modulated image of the object to extract facial signatures;
compare the facial signatures to the face ID data; and
determine whether the object is the live face of the authorized person based on the comparison.

2 . The security check system of claim 1 , wherein the modulated image of the object includes distortions.

3 . The security check system of claim 2 , wherein the distortions comprise barrel distortions.

4 . The security check system of claim 1 , wherein the modulated image of the object includes depth information of the object.

5 . The security check system of claim 1 , wherein the imaging lens comprises:
a transparent slab having a first surface facing the object, and a second surface opposite to the first surface; and a half-ball lens attached to the second surface of the transparent slab.

6 . The security check system of claim 5 , wherein the imaging lens further comprises an aperture positioned at the second surface of the transparent slab, a center of the aperture substantially coinciding with a center of the half-ball lens.

7 . The security check system of claim 1 , wherein the imaging lens has a first field of view (FOV), and the camera further comprises:
FOV converter optics positioned in front of the imaging lens and configured so that a combination of the imaging lens and the FOV converter optics has a second FOV that is less than the first FOV.

8 . The security check system of claim 1 , further comprising:
an output interface communicatively coupled to the processing module and the electronic platform; wherein the processing module is further configured to:
in response to determining that the object is not the live face of the authorized person, output a negative facial recognition decision to the electronic platform via the output interface so as to cause the electronic platform to deny access thereto; and
in response to determining that the object is the live face of the authorized person, output a positive facial recognition decision to the electronic platform via the output interface so as to cause the electronic platform to grant access thereto.

9 . A face ID sensor comprising:
an imaging lens configured to form a modulated image of an object, the imaging lens comprising:
a transparent slab having a first surface facing the object, and a second surface opposite to the first surface; and
a half-ball lens attached to the second surface of the transparent slab; and
a photodetector positioned substantially at a focal plane of the imaging lens and configured to convert optical signals of the modulated image into electrical signals.

10 . The face ID sensor of claim 9 , wherein the imaging lens further comprises an aperture positioned at the second surface of the transparent slab, a center of the aperture substantially coinciding with a center of the half-ball lens.

11 . The face ID sensor of claim 9 , wherein the transparent slab has a first index of refraction, and the half-ball lens has a second index of refraction that is substantially equal to the first index of refraction.

12 . The face ID sensor of claim 9 , wherein the modulated image of the object includes distortions.

13 . The face ID sensor of claim 12 , wherein the distortions comprise barrel distortions.

14 . The face ID sensor of claim 9 , wherein the imaging lens has a first field of view (FOV), and the face ID sensor further comprising:
FOV converter optics positioned in front of the imaging lens and configured so that a combination of the imaging lens and the FOV converter optics has a second FOV that is less than the first FOV.

15 . The face ID sensor of claim 14 , wherein the FOV converter optics comprises a telescope.

16 . A method of security check using face ID sensing for secure access to an electronic platform, the method performed by a security check system including a camera, a computer memory, and a processing module, the method comprising:
storing face ID data of an authorized person in the computer memory, the face ID data generated from one or more images of a live face of the authorized person acquired by the camera during a registration process, wherein the camera comprises an imaging lens configured to form modulated images; acquiring, using the camera, a modulated image of a first object positioned in front of the camera; analyzing, using the processing module, the modulated image of the first object to extract facial signatures; comparing, using the processing module, the facial signatures to the face ID data; and determining, using the processing module, whether the first object is the live face of the authorized person based on the comparison.

17 . The method of claim 16 , wherein the modulated image of the first object includes distortions.

18 . The method of claim 17 , wherein the distortions comprise barrel distortions.

19 . The method of claim 16 , wherein the modulated image of the first object includes depth information of the first object.

20 . The method of claim 16 , further comprising:
in response to determining that the first object is not the live face of the authorized person, denying access to the electronic platform; and in response to determining that the first object is the live face of the authorized person, granting access to the electronic platform.

Assignees

• Shenzhen Goodix Tech Co Ltd

Inventors

• He Yi
• Pi Bo

Classifications

• H04L63/0861 Primary

  using biometrical features, e.g. fingerprint, retina-scan (cryptographic mechanisms or cryptographic arrangements for entity authentication using biological data H04L9/3231) · CPC title

• G06V40/166

  using acquisition arrangements · CPC title

• G06V40/45

  Detection of the body part being alive · CPC title

• H04N23/56

  provided with illuminating means · CPC title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title