Fingerprint authentication device and information processing device

• US 20070223791A1
• Filed: 06/19/2006
• Published: 09/27/2007
• Est. Priority Date: 03/27/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Shinzaki, Takashi
• Granted Patent: US 8,385,611 B2
• Time in Patent Office: Days
• US Class Current: 382/124
• CPC Class Codes: G06V 40/1335 Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement
• CPC Class Codes: G06V 40/1388 using image processing

Abstract

A fingerprint authentication device includes a sweep fingerprint sensor that acquires images of a fingerprint on a finger at at least two different sensitivity levels in a single scan, and a counterfeit-finger determining unit that determines whether the finger is counterfeit based on the images acquired by the sweep fingerprint sensor.

Claims

1. A fingerprint authentication device comprising:

a sweep fingerprint sensor that acquires images of a fingerprint on a finger at at least two different sensitivity levels in a single scan; and

a counterfeit-finger determining unit that determines whether the finger is counterfeit based on the images acquired by the sweep fingerprint sensor.

2. The fingerprint authentication device according to claim 1, wherein the counterfeit-finger determining unit determines that the finger is counterfeit when a difference in a parameter relating to the images is less than a threshold.

3. The fingerprint authentication device according to claim 2, wherein the parameter includes luminance of the images.

4. The fingerprint authentication device according to claim 2, wherein the parameter includes unevenness in luminance of the images.

5. The fingerprint authentication device according to claim 2, wherein the parameter includes distribution in luminance of the images.

6. The fingerprint authentication device according to claim 2, wherein the parameter includes difference in the images.

7. The fingerprint authentication device according to claim 1, further comprising a sweat-pattern detecting unit that detects whether any of the images acquired by the sweep fingerprint sensor includes a sweat pattern, wherein

the counterfeit-finger determining unit determines whether the finger is counterfeit based on the images acquired by the sweep fingerprint sensor and a result of detection obtained by the sweat-pattern detecting unit.

8. The fingerprint authentication device according to claim 7, wherein the counterfeit-finger determining unit determines that the finger is counterfeit when a difference in a parameter relating to the images is less than a threshold and when the sweat-pattern detecting unit detects a sweat pattern in any of the images.

9. The fingerprint authentication device according to claim 1, wherein

the sweep fingerprint sensor acquires images of the fingerprint at three different sensitivity levels in a single scan, and

the fingerprint authentication device further comprises a fingerprint authentication unit that determines whether the fingerprint is authentic based on the image of the fingerprint at an intermediate sensitivity level among the images at the three different sensitivity levels.

10. The fingerprint authentication device according to claim 1, further comprising a warning unit that outputs a warning when the sweep fingerprint sensor can not acquire an image of the fingerprint on the finger.

11. The fingerprint authentication device according to claim 1, wherein the sweep fingerprint sensor is a capacitance fingerprint sensor.

12. The fingerprint authentication device according to claim 1, wherein the sweep fingerprint sensor is a weak-electric-field fingerprint sensor.

13. An information processing device comprising:

a storage unit that stores therein images of a fingerprint on a finger acquired by a sweep fingerprint sensor at at least two different sensitivity levels in a single scan; and

a counterfeit-finger determining unit that determines whether the finger is counterfeit based on the images in the storage unit.