Biometric authentication apparatus, biometric authentication system and biometric authentication method

Patent metadata

Field	Value
Publication number	US-10726282-B2
Application number	US-201715840212-A
Country	US
Kind code	B2
Filing date	Dec 13, 2017
Priority date	Dec 20, 2016
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A processor obtains characteristics information of a biometric image captured while casting first or second illumination light onto an authentication target. The first illumination light includes light of a first wavelength, and the second illumination light includes light of the first wavelength and light of a second wavelength. The processor reads characteristics information of a biometric image captured while casting illumination light cast onto the authentication target from a memory that stores first characteristics information of a first biometric image and second characteristics information of a second biometric image. The first biometric image is captured while casting the first illumination light onto a registration target, and the second biometric image is captured while casting the second illumination light onto the registration target. The processor calculates a similarity between the obtained characteristics information and the characteristics information read from the memory, and conducts authentication.

First claim

What is claimed is:

1. A biometric authentication apparatus comprising:
a memory configured to store first characteristics information of a first biometric image captured while casting first illumination light including light of a first wavelength onto a living body that is a registration target and second characteristics information of a second biometric image captured while casting second illumination light including light of the first wavelength and light of a second wavelength different from the first wavelength onto the living body that is the registration target, wherein the first illumination light is output from a first light source and the second illumination light is output from a second light source; and
a processor coupled to the memory and configured to
obtain characteristics information of a biometric image captured while casting the first illumination light or the second illumination light onto a living body that is an authentication target,
read characteristics information of a biometric image captured while casting illumination light cast onto the living body that is the authentication target from the memory,
calculate a similarity between the obtained characteristics information and the characteristics information read from the memory, and
conduct authentication of the living body that is the authentication target on the basis of the similarity.

2. The biometric authentication apparatus according to claim 1 , wherein
the obtained characteristics information includes characteristics information of a first authentication-target living-body image captured while casting the first illumination light onto the living body that is the authentication target and characteristics information of a second authentication-target living-body image captured while casting the second illumination light onto the living body that is the authentication target,
the processor reads the first characteristics information and the second characteristics information from the memory, and
the similarity includes a first similarity between the characteristics information of the first authentication-target living-body image and the first characteristics information, a second similarity between the characteristics information of the first authentication-target living-body image and the second characteristics information, a third similarity between the characteristics information of the second authentication-target living-body image and the first characteristics information, and a fourth similarity between the characteristics information of the second authentication-target living-body image and the second characteristics information.

3. The biometric authentication apparatus according to claim 1 , wherein
the processor estimates a spectral distribution of an image capturing region, and
the biometric image of the living body that is the authentication target is a biometric image captured while casting, onto the living body that is the authentication target, illumination light selected from between the first illumination light and the second illumination light on the basis of the spectral distribution estimated by the processor.

4. The biometric authentication apparatus according to claim 3 , wherein
the processor reads the first characteristics information and the second characteristics information from the memory, and
the similarity includes a first similarity between the obtained characteristics information and the first characteristics information and a second similarity between the obtained characteristics information and the second characteristics information.

5. The biometric authentication apparatus according to claim 3 , wherein
the image capturing region is a region that is within an angle of view of a camera that captures the biometric image of the living body that is the authentication target,
the processor estimates the spectral distribution from a brightness of the image capturing region captured by the camera, and
the second illumination light is selected when the brightness is lower than a prescribed value, and the first illumination light is selected when the brightness is higher than the prescribed value.

6. The biometric authentication apparatus according to claim 3 , wherein
the image capturing region is a region that is within an angle of view of a camera that captures the biometric image of the living body that is the authentication target,
the processor estimates the spectral distribution from a brightness of the image capturing region measured by an illuminance sensor, and
the second illumination light is selected when the brightness is lower than a prescribed value, and the first illumination light is selected when the brightness is higher than the prescribed value.

7. A biometric authentication system comprising:
a first light source configured to output first illumination light including light of a first wavelength;
a second light source configured to output second illumination light including light of the first wavelength and light of a second wavelength different from the first wavelength;
a camera configured to capture an image of a living body;
a memory configured to store first characteristics information of a first biometric image captured while casting the first illumination light onto a living body that is a registration target and second characteristics information of a second biometric image captured while casting the second illumination light onto the living body that is the registration target; and
a processor configured to obtain characteristics information of a biometric image captured while casting the first illumination light or the second illumination light onto a living body that is an authentication target, to read, from the memory, characteristics information of a biometric image captured while casting illumination light cast onto the living body that is the authentication target, to calculate a similarity between the obtained characteristics information and the characteristics information read from the memory, and to conduct authentication of the living body that is the authentication target on the basis of the similarity.

8. The biometric authentication system according to claim 7 , wherein
the obtained characteristics information includes characteristics information of a first authentication-target living-body image captured while casting the first illumination light onto the living body that is the authentication target and characteristics information of a second authentication-target living-body image captured while casting the second illumination light onto the living body that is the authentication target,
the processor reads the first characteristics information and the second characteristics information from the memory, and
the similarity includes a first similarity between the characteristics information of the first authentication-target living-body image and the first characteristics information, a second similarity between the characteristics information of the first authentication-target living-body image and the second characteristics information, a third similarity between the characteristics information of the second authentication-target living-body image and the first characteristics information, and a fourth similarity between the characteristics information of the second authentication-target living-body image and the second characteristics information.

9. The biometric authentication system according to claim 7 , wherein
the processor estimates a spectral distribution of an image capturing region, and
the biometric image of the living body that is the authentication target is a biometric image captured while casting, onto the living body that is the authenti

Assignees

• Fujitsu Ltd
• Fujitsu Limtited

Inventors

• Hama Soichi
• Abiko Yukihiro
• Maeda Satoshi
• Semba Satoshi
• Nada Hajime

Classifications

• G06F21/83 Primary

  input devices, e.g. keyboards, mice or controllers thereof · CPC title

• G06V10/761

  Proximity, similarity or dissimilarity measures · CPC title

• G06V40/10

  Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands · CPC title

• G06F18/22

  Matching criteria, e.g. proximity measures · CPC title

• G06V10/143

  Sensing or illuminating at different wavelengths · CPC title