FINGERPRINT IDENTIFICATION DEVICE AND FINGERPRINT IDENTIFICATION METHOD

• US 20180225502A1
• Filed: 03/31/2018
• Published: 08/09/2018
• Est. Priority Date: 08/26/2014
• Status: Active Grant

• Current Assignee: Gingy Technology Inc.
• Original Assignee: Gingy Technology Inc.
• Inventors: Hung, Chun-Lang, Wu, Jen-Chieh
• Granted Patent: US 10,216,978 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/1172 using fingerprinting
• CPC Class Codes: G06V 10/143 Sensing or illuminating at different wavelengths
• CPC Class Codes: G06V 40/1312 direct reading, e.g. contactless acquisition
• CPC Class Codes: G06V 40/1365 Matching; Classification
• CPC Class Codes: G06V 40/1394 using acquisition arrangements
• CPC Class Codes: G06V 40/15 Biometric patterns based on physiological signals, e.g. heartbeat, blood flow

Abstract

A fingerprint identification device including a light source, a processor, and a light receiver is provided. The light source emits a light beam to an object. The light receiver captures an object image of the object in a time interval. The processor analyzes the object image to obtain a fingerprint image, and performs a fingerprint identification operation on the fingerprint image to obtain a fingerprint identification result. The processor further analyzes the object image to obtain pixel change data of the object image in the time interval, and determines whether the fingerprint image is verified according to the fingerprint identification result and the pixel change data. A fingerprint identification method is also provided.

Claims

1. A fingerprint identification device, comprising:

a light source, configured to emit a light beam to an object;

a processor, coupled to the light source; and

a light receiver, coupled to the processor, and configured to capture an object image of the object in a time interval,

wherein the processor analyzes the object image to obtain a fingerprint image, and the processor performs a fingerprint identification operation on the fingerprint image to obtain a fingerprint identification result, wherein the processor further analyzes the object image to obtain pixel change data of the object image in the time interval, and the processor determines whether the fingerprint image is verified according to the fingerprint identification result and the pixel change data.

2. The fingerprint identification device according to claim 1, further comprising:

a touch sensor, coupled to the processor, and configured to sense whether the object is placed on the touch sensor to output a sensing signal to the processor,

wherein the processor determines whether to drive the light source to enable the light source to emit the light beam according to the sensing signal.

3. The fingerprint identification device according to claim 1, wherein the light beam emitted by the light source is a single-wavelength light beam or a multi-wavelength light beam.

4. The fingerprint identification device according to claim 1, wherein the object image captured by the light receiver comprises a plurality of object pictures, and the processor selects one of the object pictures for analysis to obtain the fingerprint image.

5. The fingerprint identification device according to claim 1, wherein the object image captured by the light receiver comprises a plurality of object pictures, and the processor analyzes at least one partial block of each of the object pictures respectively to obtain pixel data corresponding to the object pictures in the time interval, wherein the processor collects statistics of the pixel data to obtain the pixel change data.

6. The fingerprint identification device according to claim 5, wherein the pixel data is a total red pixel value of the at least one partial block of each of the object pictures respectively.

7. The fingerprint identification device according to claim 5, wherein the pixel data is an operation result of red pixel data, green pixel data, and blue pixel data of the at least one partial block of each of the object pictures respectively.

8. The fingerprint identification device according to claim 1, wherein the processor analyzes the pixel change data to determine whether a pixel value in the pixel change data presents a periodical change in the time interval.

9. The fingerprint identification device according to claim 8, wherein when the processor determines that the pixel value in the pixel change data presents the periodical change in the time interval, the processor further generates heartbeat information according to a periodical change result of the pixel value in the time interval.

10. A fingerprint identification method, adapted for a fingerprint identification device, comprising:

emitting a light beam to an object by a light source;

capturing an object image of the object in a time interval by a light receiver;

analyzing the object image to obtain a fingerprint image, and performing a fingerprint identification operation on the fingerprint image to obtain a fingerprint identification result;

further analyzing the object image to obtain pixel change data of the object image in the time interval; and

determining whether the fingerprint image is verified according to the fingerprint identification result and the pixel change data.

11. The fingerprint identification method according to claim 10, further comprising:

sensing whether the object is placed on a touch sensor to output a sensing signal by the touch sensor; and

determining whether to drive the light source to enable the light source to emit the light beam according to the sensing signal.

12. The fingerprint identification method according to claim 10, wherein the light beam emitted by the light source is a single-wavelength light beam or a multi-wavelength light beam.

13. The fingerprint identification method according to claim 10, wherein the object image captured by the light receiver comprises a plurality of object pictures, and analyzing the object image to obtain the fingerprint image comprises:

selecting one of the object pictures for analysis to obtain the fingerprint image.

14. The fingerprint identification method according to claim 10, wherein the object image captured by the light receiver comprises a plurality of object pictures, and further analyzing the object image to obtain the pixel change data of the object image in the time interval comprises:

analyzing at least one partial block of each of the object pictures respectively to obtain pixel data corresponding to the object pictures in the time interval; and

collecting statistics of the pixel data to obtain the pixel change data.

15. The fingerprint identification method according to claim 14, wherein the pixel data is a total red pixel value of the at least one partial block of each of the object pictures respectively.

16. The fingerprint identification method according to claim 14, wherein the pixel data is an operation result of red pixel data, green pixel data, and blue pixel data of the at least one partial block of each of the object pictures respectively.

17. The fingerprint identification method according to claim 10, wherein determining whether the fingerprint image is verified according to the fingerprint identification result and the pixel change data comprises:

analyzing the pixel change data to determine whether a pixel value in the pixel change data presents a periodical change in the time interval.

18. The fingerprint identification method according to claim 17, further comprising:

further generating heartbeat information according to a periodical change result of the pixel value in the time interval when the pixel value in the pixel change data presents the periodical change in the time interval.

19. A fingerprint identification device, comprising:

an organic light emitting diode display panel, comprises a light source configured to emit a light beam to an object;

a processor, coupled to the light source and the organic light emitting diode display panel; and

a light receiver, coupled to the processor, and configured to capture an object image of the object in a time interval,

wherein the processor analyzes the object image to obtain a fingerprint image, and the processor performs a fingerprint identification operation on the fingerprint image to obtain a fingerprint identification result, wherein the processor further analyzes the object image to obtain pixel change data of the object image in the time interval, and the processor determines whether the fingerprint image is verified according to the fingerprint identification result and the pixel change data,

wherein the processor analyzes the pixel change data to determine whether a pixel value in the pixel change data presents a periodical change in the time interval,

wherein when the processor determines that the pixel value in the pixel change data presents the periodical change in the time interval, the processor further generates heartbeat information according to a periodical change result of the pixel value in the time interval.

20. A fingerprint identification method, adapted for a fingerprint identification device, comprising:

emitting a light beam to an object by a light source of an organic light emitting diode display panel;

capturing an object image of the object in a time interval by a light receiver;

analyzing the object image to obtain a fingerprint image, and performing a fingerprint identification operation on the fingerprint image to obtain a fingerprint identification result;

further analyzing the object image to obtain pixel change data of the object image in the time interval;

determining whether the fingerprint image is verified according to the fingerprint identification result and the pixel change data, wherein determining whether the fingerprint image is verified according to the fingerprint identification result and the pixel change data comprises;

analyzing the pixel change data to determine whether a pixel value in the pixel change data presents a periodical change in the time interval; and

further generating heartbeat information according to a periodical change result of the pixel value in the time interval when the pixel value in the pixel change data presents the periodical change in the time interval.