IMAGE EXPOSURE METHOD FOR MOBILE TERMINAL BASED ON EYEPRINT RECOGNITION AND IMAGE EXPOSURE SYSTEM

• US 20170150025A1
• Filed: 05/07/2015
• Published: 05/25/2017
• Est. Priority Date: 05/07/2015
• Status: Active Grant

• Current Assignee: JRD Communication Inc. (TCL Technology Group Corp.)
• Original Assignee: JRD Communication Inc. (TCL Technology Group Corp.)
• Inventors: TANG, XIANGDONG
• Granted Patent: US 10,437,972 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 21/31 User authentication
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06V 40/174 Facial expression recognition
• CPC Class Codes: G06V 40/19 Sensors therefor
• CPC Class Codes: G06V 40/193 Preprocessing; Feature extraction
• CPC Class Codes: G06V 40/197 Matching; Classification
• CPC Class Codes: H04L 63/0861 using biometrical features, e.g. fingerprint, retina-scan cryptographic mechanisms or cryptographic arrangements for entity authentication using biological data H04L9/3231
• CPC Class Codes: H04N 23/61 based on recognised objects
• CPC Class Codes: H04N 23/611 where the recognised objects include parts of the human body
• CPC Class Codes: H04N 23/63 by using electronic viewfinders
• CPC Class Codes: H04N 23/71 Circuitry for evaluating the brightness variation
• CPC Class Codes: H04N 23/73 by influencing the exposure time
• CPC Class Codes: H04N 23/76 by influencing the image signals
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/08 Access security

Abstract

An image exposure method for a mobile terminal may be based on eyeprint recognition and an image exposure system, wherein the image exposure method may include acquiring image data through a camera when it is detected that the mobile terminal turns on the eyeprint recognition; positioning an eyeball at an eyeball position, and acquiring a brightness parameter of the eyeball position; and querying a prestored exposure parameter corresponding to the acquired brightness parameter, adjusting the exposure parameter, and exposing the eyeball at the eyeball position according to the adjusted exposure parameter.

Claims

1. An image exposure method for a mobile terminal based on eyeprint recognition, comprising:

detecting whether eyeprint recognition unlocking is started or not;

if the eyeprint recognition unlocking is started, turning on a camera to acquire a user'"'"'s face image and display by preview the acquired face image on a display screen;

processing the face image by using eyeprint recognition software to position an eyeball at an eyeball position of the face image;

acquiring a brightness parameter of the eyeball position;

querying a prestored exposure parameter corresponding to the acquired brightness parameter, and adjusting the queried exposure parameter so that a brightness of an image exposed by using the adjusted exposure parameter is 128 gray-levels;

exposing the eyeball position based on the adjusted exposure parameter; and

matching an eyeprint image acquired after an exposure with prestored eyeprint data, and unlocking the mobile terminal if the matching succeeds, or prompting a failure in the unlocking of the mobile terminal if the matching fails.

2. The image exposure method for a mobile terminal based on eyeprint recognition according to claim 1, including

increasing a signal amplification factor and exposure time if the acquired brightness parameter is less than 128 gray-levels;

and

decreasing the signal amplification factor and the exposure time if the acquired brightness parameter is greater than 128 gray-levels.

12. The method of claim 1, wherein an alternate password is activated in response to a failure of the system to unlock the mobile terminal with the first password.

13. The method of claim 1, wherein the eyeprint image is formed from two sides of a person'"'"'s iris.

14. The method of claim 2, including determining whether to increase the exposure time based on a difference between a value of the acquired brightness parameter and a target brightness value.

3. An image exposure method for a mobile terminal based on eyeprint recognition, including:

acquiring image data through a camera when it is detected that the mobile terminal turns on the eyeprint recognition;

positioning an eyeball at an eyeball position, and acquiring a brightness parameter of the eyeball position;

querying a prestored exposure parameter corresponding to the acquired brightness parameter, adjusting the exposure parameter, and exposing an eyeball at the eyeball position according to the adjusted exposure parameter.

4. The image exposure method for a mobile terminal based on eyeprint recognition according to claim 3, including:

acquiring in advance and storing a corresponding relation among a user'"'"'s eyeprint data, the acquired brightness parameter and the adjusted exposure parameter.

5. The image exposure method for a mobile terminal based on eyeprint recognition according to claim 4, including:

verifying an image acquired after exposure with prestored eyeprint data to unlock the mobile terminal.

6. The image exposure method for a mobile terminal based on eyeprint recognition according to claim 5, including:

querying a prestored exposure parameter corresponding to the brightness parameter;

decreasing or increasing exposure time and signal amplification factor according to a corresponding relation; and

exposing the eyeball at the eyeball position according to an adjusted exposure parameter.

7. The image exposure method for a mobile terminal based on eyeprint recognition according to claim 3, wherein

the exposed eyeball may be a left eye or/and a right eye.

15. The method of claim 3, wherein an alternate nine-grid pattern is activated to unlock the camera in response to a failure of the system to unlock the mobile terminal with a first nine-grid pattern.

16. The method of claim 5, including determining whether to increase the exposure time based on a difference between a value of the acquired brightness parameter and a target brightness value.

17. The method of claim 3, wherein the eyeprint image is formed from two sides of a person'"'"'s iris.

8. An image exposure system for a mobile terminal based on eyeprint recognition, comprising:

a detecting and acquiring module, configured to acquire image data through a camera when it is detected that the mobile terminal turns on the eyeprint recognition;

a positioning module, configured to position an eyeball at an eyeball position, and acquire a brightness parameter of the eyeball position; and

an adjusting and exposing module, configured to query a prestored exposure parameter corresponding to the acquired brightness parameter of the eyeball position, adjust the prestored exposure parameter, and expose an eyeball at the eyeball position according to the adjusted exposure parameter.

9. The image exposure system for a mobile terminal based on eyeprint recognition according to claim 8, including:

a prestoring module, configured to acquire in advance and store a corresponding relation among a user'"'"'s eyeprint data, the acquired brightness parameter of the eyeball position and the prestored exposure parameter.

10. The image exposure system for a mobile terminal based on eyeprint recognition according to claim 9, including:

a verifying and unlocking module, configured to verify an image acquired after exposure with prestored eyeprint data to unlock the mobile terminal.

11. The image exposure system for a mobile terminal based on eyeprint recognition according to claim 10, wherein the adjusting and exposing module includes:

a querying unit, configured to query the prestored exposure parameter corresponding to the acquired brightness parameter of the eyeball position;

an adjusting unit, configured to decrease or increase exposure time and a signal amplification factor according to a corresponding relation; and

an exposing module, configured to expose the eyeball at the eyeball position according to the adjusted exposure parameter.

18. The system of claim 8, wherein the system activates an alternate password in response to a failure of the system to unlock the mobile terminal with the first password.

19. The system of claim 11, wherein the system determines whether to increase the exposure time based on a difference between a value of the acquired brightness parameter of the eyeball position and a target brightness value.

20. The system of claim 11, wherein the system determines whether to increase the signal amplification factor based on a difference between a value of the acquired brightness parameter of the eyeball position and a target brightness value.