BIOMETRIC AUTHENTICATION DEVICE AND BIOMETRIC IMAGE OUTPUT CONTROL METHOD

• US 20160188860A1
• Filed: 12/29/2015
• Published: 06/30/2016
• Est. Priority Date: 12/29/2014
• Status: Active Grant

• Current Assignee: Suprema Incorporated
• Original Assignee: Suprema Incorporated
• Inventors: LEE, Hyeonchang, SHIN, Hochul, LEE, Kideok, LEE, Jae Won, SONG, Bong Seop
• Granted Patent: US 10,068,079 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06V 40/166 using acquisition arrangements
• CPC Class Codes: G06V 40/172 Classification, e.g. identification
• CPC Class Codes: G06V 40/67 by interactive indications to the user

Abstract

A biometric image output control method in a biometric authentication device comprises the step of generating a biometric image by imaging an living body to be authenticated; determining whether an imaging environment; if the imaging environment satisfies a predetermined recognition condition, controlling a change rate of a size of a biometric image, a change rate of a focal point of the biometric image and a change rate of a brightness of the biometric image according to a distance to the living body to be authenticated; and if the imaging environment does not satisfy the predetermined recognition condition, overly controlling at least one of the change rate of the size of the biometric image, the change rate of the focal point of the biometric image and the change rate of the brightness of the biometric image according to the distance.

Claims

1. A biometric image output control method for a biometric authentication device including a living body imaging unit, the method comprising:

generating a biometric image by imaging a living body to be authenticated;

determining whether an imaging environment for the living body to be authenticated satisfies a predetermined recognition condition;

when the imaging environment satisfies the predetermined recognition condition, controlling a change rate of a size of the biometric image, a change rate of a focal point of the biometric image, and a change rate of brightness of the biometric image according to a change of a distance from the living body imaging unit to the living body to be authenticated; and

when the imaging environment does not satisfy the predetermined recognition condition, controlling at least one of the change rate of the size of the biometric image, the change rate of the focal point of the biometric image, and the change rate of the brightness of the biometric image to be greater than the change of the distance from the living body imaging unit to the living body to be authenticated.

2. The method of claim 1, wherein the predetermined recognition condition comprises a case where the distance falls within a predetermined recognition distance range.

3. The method of claim 1, wherein the predetermined recognition condition comprises a case where the focal point of the biometric image falls within a predetermined focal point range.

4. The method of claim 1, wherein the predetermined recognition condition comprises a case where a brightness of the imaging environment falls within a predetermined brightness range.

5. The method of claim 1, wherein the controlling when the imaging environment does not satisfy the predetermined recognition condition comprises making the change rate of the size of the biometric image greater than the change rate according to the distance from the living body imaging unit to the living body to be authenticated.

6. The method of claim 1, wherein the controlling when the imaging environment does not satisfy the predetermined recognition condition comprises making the change rate of the focal point of the biometric image greater than the change of the distance from the living body imaging unit to the living body to be authenticated.

7. The method of claim 1, wherein the controlling when the imaging environment does not satisfy the predetermined recognition condition comprises making the change rate of the brightness of the biometric image greater than the change of the distance from the living body imaging unit to the living body to be authenticated.

8. A biometric authentication device, comprising:

a living body imaging unit configured to generate a biometric image by imaging a living body to be authenticated;

an environment determining unit configured to determine whether an imaging environment for the living body to be authenticated satisfies a predetermined recognition condition; and

an output control unit configured to;

when the imaging environment satisfies the predetermined recognition condition, control a change rate of a size of the biometric image, a change rate of a focal point of the biometric image, and a change rate of brightness of the biometric image according to a change of a distance from the living body imaging unit to the living body to be authenticated; and

when the imaging environment does not satisfy the predetermined recognition condition, control at least one of the change rate of the size of the biometric image, the change rate of the focal point of the biometric image, and the change rate of the brightness of the biometric image to be greater than the change of the distance from the living body imaging unit to the living body to be authenticated.

9. The device of claim 8, wherein the predetermined recognition condition comprises a case where the distance falls within a predetermined recognition distance range.

10. The device of claim 8, wherein the predetermined recognition condition comprises a case where the focal point of the biometric image falls within a predetermined focal point range.

11. The device of claim 8, wherein the predetermined recognition condition comprises a case where a brightness of the imaging environment falls within a predetermined brightness range.

12. The device of claim 8, wherein, when the imaging environment does not satisfy the predetermined recognition condition, the output control unit is configured to make the change rate of the size of the biometric image greater than the change of the distance from the living body imaging unit to the living body to be authenticated.

13. The device of claim 8, wherein, when the imaging environment does not satisfy the predetermined recognition condition, the output control unit is configured to make the change rate of the focal point of the biometric image greater than the change of the distance from the living body imaging unit to the living body to be authenticated.

14. The device of claim 8, wherein, when the imaging environment does not satisfy the predetermined recognition condition, the output control unit is configured to make the change rate of the brightness of the biometric image greater than the change of the distance from the living body imaging unit to the living body to be authenticated.