Device and method for biometrics authentication

Patent metadata

Field	Value
Publication number	US-2017286741-A1
Application number	US-201715444568-A
Country	US
Kind code	A1
Filing date	Feb 28, 2017
Priority date	Mar 31, 2016
Publication date	Oct 5, 2017
Grant date	—

Abstract

A biometrics authentication apparatus and a biometrics authentication method are disclosed. The biometrics authentication apparatus includes: a light source configured to emit a light; a modulator configured to change a spatial distribution of the light that is scattered and reflected from a region of interest of a user; a detector configured to detect an integral power of the light that is scattered from the region of interest; and a processor configured to obtain a measurement signal based on the integral power of the light, compare the measurement signal with a reference signal stored in a memory, and determine whether to authenticate the user based on a degree of match between the measurement signal and the reference signal.

First claim

What is claimed is:

1 . A biometrics authentication apparatus comprising:
a light source configured to emit a light; a modulator configured to change a spatial distribution of the light that is scattered and reflected from a region of interest of a user; a detector configured to detect an integral power of the light that is scattered from the region of interest; and a processor configured to obtain a measurement signal based on the integral power of the light, compare the measurement signal with a reference signal stored in a memory, and determine whether to authenticate the user based on a degree of match between the measurement signal and the reference signal.

2 . The biometrics authentication apparatus of claim 1 , wherein the modulator comprises a 2-dimensional (2D) binary mask comprising a block area in which light is blocked and a pass area in which light passes, and
the detector is further configured to detect the integral power of the light as respective values with regard to the 2D binary mask that is formed at temporal intervals according to sequence control of the modulator.

3 . The biometrics authentication apparatus of claim 1 , wherein the modulator is further configured to operate based on a spatial distribution of an amplitude transmission function to generate a 2-dimensional (2D) binary mask comprising a block area in which light is blocked and a pass area in which light passes, and
wherein the processor is further configured to control the modulator to change the spatial distribution of the light through the 2D binary mask.

4 . The biometrics authentication apparatus of claim 1 , wherein the processor is further configured to determine whether to authenticate the user based on a correlation value used to determine the degree of match between the measurement signal and the reference signal.

5 . The biometrics authentication apparatus of claim 4 , wherein the processor is further configured to determine that the user has been authenticated when a correlation value between the measurement signal and the reference signal is greater than or equal to 0.95.

6 . The biometrics authentication apparatus of claim 1 , wherein the degree of match is represented by a correlation value between the measurement signal and the reference signal, and
the processor is further configured to perform an authentication process until the correlation value becomes greater than or equal to a predetermined value by repeating a shift of a 2-dimensional (2D) binary mask of the modulator to correct misalignment of the biometrics authentication apparatus.

7 . The biometrics authentication apparatus of claim 6 , wherein the predetermined value is greater than or equal to 0.95.

8 . The biometrics authentication apparatus of claim 6 , wherein the processor is further configured to obtain a matrix comprising the correlation value by repeating the shift of the 2D binary mask along at least one of an x axis and a y axis of the 2D binary mask.

9 . The biometrics authentication apparatus of claim 1 , wherein the light emitted from the light source comprises near infrared light having a wavelength ranging from about 750 nm to about 950 nm.

10 . The biometrics authentication apparatus of claim 1 , wherein the biometrics authentication apparatus comprises a wearable device configured to be worn on a wrist of the user.

11 . A biometrics authentication method comprising:
emitting a light onto a region of interest of a user; changing a spatial distribution of the light that is scattered from the region of interest; detecting an integral power of the light that is scattered from the region of interest; obtaining a measurement signal based on the integral power of the light; comparing the measurement signal with a reference signal; and determining whether to authenticate the user based on a degree of match between the measurement signal and the reference signal.

12 . The biometrics authentication method of claim 11 , wherein the changing the spatial distribution of the light comprises changing the spatial distribution of the light based on a 2-dimensional (2D) binary mask comprising a block area in which light is blocked and a pass area in which light passes, and
the detecting of the integral power of the light comprises detecting the integral power of the light as respective values with regard to the 2D binary mask.

13 . The biometrics authentication method of claim 12 , the changing the spatial distribution of the light further comprises changing the 2D binary mask to generate the 2D binary mask at a temporal interval.

14 . The biometrics authentication method of claim 11 , wherein the determining whether to authenticate the user comprises determining whether to authenticate the user based on a correlation value used to determine the degree of match between the measurement signal and the reference signal.

15 . The biometrics authentication method of claim 14 , wherein the determining whether to authenticate the user comprises determining that the user has been authenticated when the correlation value is greater than equal to 0.95.

16 . The biometrics authentication method of claim 12 , wherein the degree of match is represented by a correlation value between the measurement signal and the reference signal, and
the method further comprises, while a shift of the 2D binary mask is repeatedly performed, performing an authentication process until the correlation value becomes greater than or equal to a predetermined value to correct misalignment of a biometrics authentication apparatus that performs the biometrics authentication method.

17 . The biometrics authentication method of claim 16 , wherein the predetermined value is greater than or equal to 0.95.

18 . The biometrics authentication method of claim 16 , wherein the performing the authentication process comprises obtaining a matrix comprising the correlation value while the shift of the 2D binary mask is repeatedly performed along at least one of an x axis and a y axis of the 2D binary mask.

19 . The biometrics authentication method of claim 11 , wherein the emitted light comprise near infrared light having a wavelength ranging from about 750 nm to about 950 nm.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lantsov Alexey Dmitrievich
• SHCHEKIN Alexey Andreevich
• RIABKO Maksim Vladimirovich
• MEDVEDEV Anton Sergeevich
• Koptyaev Sergey Nikolaevich

Classifications

• G06K9/00087

  Physics · mapped topic

• G06K9/52

  Physics · mapped topic

• G06K9/32

  Physics · mapped topic

• G06K9/2054

  Physics · mapped topic

• G06K9/0004 Primary

  Physics · mapped topic