Iris recognition method, electronic device and computer-readable storage medium

• US 10,643,069 B2
• Filed: 05/01/2018
• Issued: 05/05/2020
• Est. Priority Date: 06/16/2017
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: Zhang, Haiping
• Primary Examiner(s): Vu, Kim Y
• Assistant Examiner(s): Bloom, Nathan J
• Application Number:
  US15/968,070
• Publication Number:
  US 20180365494A1
• Time in Patent Office: 735 Days
• Field of Search: None
• CPC Class Codes: G06T 2207/10048 Infrared image
• CPC Class Codes: G06T 2207/30201 Face
• CPC Class Codes: G06T 7/20 Analysis of motion motion estimation for coding, decoding, compressing or decompressing digital video signals H04N19/43, H04N19/51
• CPC Class Codes: G06V 10/17 using hand-held instruments
• CPC Class Codes: G06V 40/19 Sensors therefor
• CPC Class Codes: G06V 40/197 Matching; Classification
• CPC Class Codes: G06V 40/28 Recognition of hand or arm movements, e.g. recognition of deaf sign language static hand signs G06V40/113

Abstract

Embodiments of the present disclosure provide an iris recognition method applied for an electronic device. The electronic device includes an iris recognition module and a motion sensor. The iris recognition module includes an infrared camera. The method includes: detecting motion information of the electronic device by the motion sensor; when the motion information of the electronic device satisfies a preset condition, capturing an image of a user by the infrared camera; and when determining that there is a face contour in the image, performing iris recognition by the iris recognition module. Further, embodiments of the present disclosure provide an electronic device and a computer-readable storage medium.

Claims

1. An iris recognition method, applied for an electronic device, wherein the electronic device comprises an iris recognition module and a motion sensor, the iris recognition module comprises an infrared camera, and the method comprises:

detecting motion information of the electronic device by the motion sensor;

when the motion information of the electronic device satisfies a preset condition, starting the infrared camera and capturing an image of a user by the infrared camera; and

when determining that there is a face contour in the image, performing iris recognition by the iris recognition module;

wherein, the iris recognition module further comprises an infrared light source, and performing the iris recognition by the iris recognition module when determining that there is the face contour in the image comprises;

filling light by the infrared light source;

capturing an iris image by the infrared camera;

positioning an iris by extracting an inner boundary of the iris using a grayscale histogram of the iris image and by extracting an outer boundary of the iris using Hough transform method;

processing the iris image based on the position of the iris to extract feature information;

determining whether the feature information matches pre-stored iris feature information; and

when the feature information matches the pre-stored iris feature information, determining that the iris recognition is successful.

2. The method according to claim 1, wherein the motion sensor comprises a gyroscope and/or an acceleration sensor.

3. The method according to claim 1, wherein the motion information comprises trajectory information, and detecting the motion information of the electronic device by the motion sensor comprises:

detecting the trajectory information of the electronic device by the motion sensor.

4. The method according to claim 3, wherein the preset condition is a preset motion trajectory,

wherein, the method further comprises:

obtaining a motion trajectory based on the trajectory information;

determining whether a difference between the motion trajectory and the preset motion trajectory is less than a preset value;

determining that the trajectory information of the electronic device satisfies the preset condition when the difference is less than the preset value.

5. The method according to claim 1, wherein the motion information comprises shake information, and detecting the motion information of the electronic device by the motion sensor comprises:

detecting the shake information of the electronic device by the motion sensor.

6. The method according to claim 5, wherein the preset condition is a preset number of shakes, wherein, the method further comprises:

determining whether a sudden acceleration change occurs based on the shake information;

counting a number of sudden acceleration changes when determining that the sudden acceleration change occurs;

determining whether the number of sudden acceleration changes during a time period is greater than the preset number of shakes; and

determining that the shake information of the electronic device satisfies the preset condition when the number of sudden acceleration changes during the time period is greater than the preset number of shakes.

18. The method of claim 5, further comprising:

detecting acceleration data of the motion sensor at different times and recording the different times;

calculating a time difference between an adjacent first acceleration and second acceleration;

calculating absolute values of change of acceleration between the first acceleration and the second acceleration on an X, Y, Z axes of the electronic device;

determining an average value for a rate of the change of acceleration based on the time difference and the absolute values;

determining that a sudden acceleration change occurs when the average value is larger than a preset average threshold;

when the number of the sudden acceleration change is greater than a preset number of shakes, starting the infrared camera and capturing the image of the user by the infrared camera; and

when determining that there is a face contour in the image, performing iris recognition by the iris recognition module.

7. An electronic device, comprising:

a motion sensor, configured to detect motion information of the electronic device;

an infrared camera, configured to be started when the motion information of the electronic device satisfies a preset condition, and to capture an image of a user; and

an iris recognition module, comprising the infrared camera and configured to, when it is determined that there is a face contour in the image, perform iris recognition;

wherein the iris recognition module further comprises an infrared light source;

the infrared light source is configured to fill light;

the infrared camera is further configured to capture an iris image; and

the iris recognition module is further configured to position an iris by extracting an inner boundary of the iris using a grayscale histogram of the iris image and by extracting an outer boundary of the iris using Hough transform method;

process the iris image based on the position of the iris to extract feature information;

determine whether the feature information matches pre-stored iris feature information; and

when the feature information matches the pre-stored iris feature information, determine that the iris recognition is successful.

8. The electronic device according to claim 7, wherein the motion sensor comprises a gyroscope and/or an acceleration sensor.

9. The electronic device according to claim 7, wherein the motion information comprises trajectory information, and the motion sensor is configured to detect the trajectory information of the electronic device.

10. The electronic device according to claim 9, wherein the electronic device further comprises a processor, the preset condition is a preset motion trajectory, and the processor is further configured to:

obtain a motion trajectory based on the trajectory information;

determine whether a difference between the motion trajectory and the preset motion trajectory is less than a preset value;

determine that the trajectory information of the electronic device satisfies the preset condition when the difference is less than the preset value.

11. The electronic device according to claim 7, wherein the motion information comprises shake information, and the motion sensor is configured to detect the shake information of the electronic device.

12. The electronic device according to claim 11, wherein the electronic device further comprises a processor, the preset condition is a preset number of shakes, and the processor is further configured to:

determine whether a sudden acceleration change occurs based on the shake information;

count a number of sudden acceleration changes when determining that the sudden acceleration change occurs;

determine whether the number of sudden acceleration changes during a time period is greater than the preset number of shakes; and

determine that the shake information of the electronic device satisfies the preset condition when the number of sudden acceleration changes during the time period is greater than the preset number of shakes.

19. The electronic device according to claim 11, further comprising a processor, wherein

the motion sensor is configured to detect acceleration data of the motion sensor at different times and record the different times;

the processor is configured to calculate a time difference between an adjacent first acceleration and second acceleration, calculate absolute values of change of acceleration between the first acceleration and the second acceleration on an X, Y, Z axes of the electronic device (100);

determine an average value for a rate of the change of acceleration based on the time difference and the absolute values; and

determine that a sudden acceleration change occurs when the average value is larger than a preset average threshold;

the infrared camera is configured to be started when the number of the sudden acceleration change is greater than a preset number of shakes and to capture the image of the user; and

an iris recognition module is configured to, when it is determined that there is the face contour in the image, perform the iris recognition.

13. A non-transitory computer-readable storage medium, comprising computer programs configured to combine with an electronic device capable of photographing,

wherein the electronic device comprises an iris recognition module and a motion sensor, the iris recognition module comprises an infrared camera, and the computer programs are configured to be executed by a processor to perform an iris recognition method, the method comprising:

detecting motion information of the electronic device by the motion sensor;

when the motion information of the electronic device satisfies a preset condition, starting the infrared camera and capturing an image of a user by the infrared camera; and

when determining that there is a face contour in the image, performing iris recognition by the iris recognition module;

wherein the iris recognition module further comprises an infrared light source, and performing the iris recognition by the iris recognition module when determining that there is the face contour in the image comprises;

filling light by the infrared light source;

capturing an iris image by the infrared camera;

positioning an iris by extracting an inner boundary of the iris using a grayscale histogram of the iris image and by extracting an outer boundary of the iris using Hough transform method;

processing the iris image based on the position of the iris to extract feature information;

determining whether the feature information matches pre-stored iris feature information; and

when the feature information matches the pre-stored iris feature information, determining that the iris recognition is successful.

14. The non-transitory computer-readable storage medium according to claim 13, the motion information comprises trajectory information, and detecting the motion information of the electronic device by the motion sensor comprises:

detecting the trajectory information of the electronic device by the motion sensor.

15. The non-transitory computer-readable storage medium according to claim 14, wherein the preset condition is a preset motion trajectory, and the method further comprises:

obtaining a motion trajectory based on the trajectory information;

determining whether a difference between the motion trajectory and the preset motion trajectory is less than a preset value;

determining that the trajectory information of the electronic device satisfies the preset condition when the difference is less than the preset value.

16. The non-transitory computer-readable storage medium according to claim 13, wherein the motion information comprises shake information, and detecting the motion information of the electronic device by the motion sensor comprises:

detecting the shake information of the electronic device by the motion sensor.

17. The non-transitory computer-readable storage medium according to claim 16, wherein the preset condition is a preset number of shakes, and the method further comprises:

determining whether a sudden acceleration change occurs based on the shake information;

counting a number of sudden acceleration changes when determining that the sudden acceleration change occurs;

determining whether the number of sudden acceleration changes during a time period is greater than the preset number of shakes; and

determining that the shake information of the electronic device satisfies the preset condition when the number of sudden acceleration changes during the time period is greater than the preset number of shakes.

20. The non-transitory computer-readable storage medium according to claim 16, wherein the method further comprises:

detecting acceleration data of the motion sensor at different times and recording the different times;

calculating a time difference between an adjacent first acceleration and second acceleration;

calculating absolute values of change of acceleration between the first acceleration and the second acceleration on an X, Y, Z axes of the electronic device;

determining an average value for a rate of the change of acceleration based on the time difference and the absolute values;

determining that a sudden acceleration change occurs when the average value is larger than a preset average threshold;

when the number of the sudden acceleration change is greater than a preset number of shakes, starting the infrared camera and capturing the image of the user by the infrared camera; and

when determining that there is a face contour in the image, performing iris recognition by the iris recognition module.