ACCUMULATION AND CONFIDENCE ASSIGNMENT OF IRIS CODES

• US 20180276467A1
• Filed: 03/23/2018
• Published: 09/27/2018
• Est. Priority Date: 03/24/2017
• Status: Active Grant

• Current Assignee: Magic Leap, Inc.
• Original Assignee: Magic Leap, Inc.
• Inventors: KAEHLER, Adrian
• Granted Patent: US 11,055,530 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 2027/0138 comprising image capture systems, e.g. camera
• CPC Class Codes: G02B 2027/014 comprising information/image processing systems
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06F 3/013 Eye tracking input arrangements G06F3/015 takes precedence
• CPC Class Codes: G06T 19/006 Mixed reality object pose determination, tracking or camera calibration for mixed reality G06T7/00
• 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: G07C 9/37 using biometric data, e.g. fingerprints, iris scans or voice recognition

Abstract

Systems and methods pertaining to iris recognition are disclosed. A system is disclosed comprising an iris imager configured to acquire an iris image, and a processor configured to receive a first plurality of iris images from the iris imager, generate a first plurality of iris codes corresponding to the first plurality of iris images, generate a distribution metric corresponding to an iris cell location, generate a first composite iris code using the distribution metric, and generate a first match value using the first composite iris code and a first stored iris code.

Claims

1. A system comprising:

an iris imager configured to acquire an iris image; and

a processor configured to;

receive a first plurality of iris images from the iris imager,

generate a first plurality of iris codes corresponding to the first plurality of iris images,

generate a distribution metric corresponding to an iris cell location,

generate a first composite iris code using the distribution metric, and

generate a first match value using the first composite iris code and a first stored iris code.

2. The system of claim 1, wherein each iris code of the first plurality of iris codes comprises a plurality of values, each value of the plurality of values corresponding to an iris cell.

3. The system of claim 2, wherein:

the iris cell location corresponds to a first iris cell, and

each iris code of the first plurality of iris codes comprises a value corresponding to the first iris cell.

4. The system of claim 1, wherein the processor is further configured to:

in response to a determination that the first match value exceeds a threshold value, activate a functionality of the system.

5. The system of claim 1, further comprising a head-mounted display.

6. The system of claim 1, wherein the first composite iris code and the first stored iris code are each a fuzzy iris code.

7. The system of claim 1, wherein the first match value is at least one of a soft Hamming Distance, a median Hamming Distance, and a fuzzy Z-score.

8. The system of claim 1, wherein generating the distribution metric comprises determining a sample-size-dependent confidence value.

9. The system of claim 1, wherein generating the first match value comprises comparing a confidence interval of the first composite iris code to a confidence interval of the first stored iris code.

10. The system of claim 1, wherein generating the distribution metric comprises determining a probability of a cell value.

11. The system of claim 1, wherein generating the distribution metric comprises quantifying the number of occurrences of a cell value.

12. The system of claim 1, wherein an iris code of the first plurality of iris codes comprises binary cell values and the first composite iris code comprises non-binary cell values.

13. The system of claim 1, wherein the processor is further configured to:

assign a quality score to an iris image of the first plurality of iris images;

compare the quality score to a threshold; and

in response to a determination that the quality score does not meet the threshold, exclude the iris image.

14. The system of claim 1, wherein generating the first match value comprises calculating a Hamming Distance.

15. The system of claim 1, wherein the processor is further configured to determine whether the first match value corresponds to a complete match.

16. The system of claim 15, wherein the processor is further configured to determine whether the first match value corresponds to a conditional match.

17. The system of claim 16, wherein the processor is further configured to:

in response to a determination that the first match value corresponds to a complete match, activate a first functionality of the system; and

in response to a determination that the first match value corresponds to a conditional match, activate a second functionality of the system, the second functionality not identical to the first functionality.

18. The system of claim 16, wherein the processor is further configured to:

in response to a determination that the first match value corresponds to a conditional match;

receive a second plurality of iris images from the iris imager,

generate a second plurality of iris codes,

generate a second composite iris code, and

generate a second match value using the second composite iris code and the first stored iris code.

19. The system of claim 1, wherein the first plurality of iris images comprises a pre-determined minimum number of iris images.

20. A method comprising:

receiving a first plurality of iris images;

generating a first plurality of iris codes corresponding to the first plurality of iris images;

generating a distribution metric corresponding to an iris cell location;

generating a first composite iris code using the distribution metric; and

generating a first match value using the first composite iris code and a first stored iris code.

21. The method of claim 20, wherein each iris code of the first plurality of iris codes comprises a plurality of values, each value of the plurality of values corresponding to an iris cell.

22. The method of claim 21, wherein:

the iris cell location corresponds to a first iris cell, and

each iris code of the first plurality of iris codes comprises a value corresponding to the first iris cell.

23. A system comprising:

a headgear unit configured to be worn by a user, the headgear unit including;

a display configured to display a virtual environment to the user, the display comprising a transmissive eyepiece through which a real environment is visible;

an iris imager configured to acquire an image of an iris of the user, the iris imager configured to remain fixed relative to the user; and

a processor configured to;

receive a first plurality of iris images from the iris imager, the plurality of images associated with the user;

generate a first plurality of iris codes corresponding to the first plurality of iris images,

generate a distribution metric corresponding to an iris cell location,

generate a first composite iris code using the distribution metric, and

generate a first match value using the first composite iris code and a first stored iris code, the first match value corresponding to the user.