# US 2018/0025207 A1 · Iris recognition via plenoptic imaging

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- Number: US 2018/0025207 A1
- Document ID: US20180025207A1
- Status: Published application
- Kind: A1
- Application number: 15/721,427
- Filed: 2017-09-29
- Published: 2018-01-25
- Earliest claimed: 2015-05-12
- Assignees: UT-Battelle, LLC
- Applicants: UT-Battelle, LLC
- Inventors: Hector J. Santos-Villalobos; Chris Bensing Boehnen; David S. Bolme
- Web page: https://patentgrep.com/patent/US20180025207A1

## CPC

- G06V 40/193: {Preprocessing; Feature extraction}
- G06T 5/50: using two or more images, e.g. averaging or subtraction
- G06T 5/73: Deblurring; Sharpening
- G06V 40/19: Sensors therefor
- G06T 2200/21: involving computational photography
- G06T 2207/10052: Images from lightfield camera
- G06T 2207/30041: Eye; Retina; Ophthalmic
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

Iris recognition can be accomplished for a wide variety of eye images by using plenoptic imaging. Using plenoptic technology, it is possible to correct focus after image acquisition. One example technology reconstructs images having different focus depths and stitches them together, resulting in a fully focused image, even in an off-angle gaze scenario. Another example technology determines three-dimensional data for an eye and incorporates it into an eye model used for iris recognition processing. Another example technology detects contact lenses. Application of the technologies can result in improved iris recognition under a wide variety of scenarios.

## Claims

### Claim at position 1

1-17. (canceled)

### Claim 18

A method implemented at least in part by a computing system, the method comprising:
receiving a plenoptic iris image depicting an iris;
from the plenoptic iris image depicting an iris, determining a three-dimensional shape of the iris;
storing the three-dimensional shape of the iris;
applying the three-dimensional shape of the iris as part of iris recognition processing; and
based on the three-dimensional shape of the iris, determining that no obfuscating contact lens is present.

### Claim 19

A method implemented at least in part by a computing system, the method comprising:
receiving a plenoptic iris image depicting an apparent iris;
from the plenoptic iris image depicting an apparent iris, computing a geometric shape of the apparent iris;
storing the geometric shape of the apparent iris;
comparing the geometric shape of the apparent iris against one or more characteristics of a contact lens; and
responsive to determining that the geometric shape of the apparent iris matches the one or more characteristics of the contact lens, sending a message to an iris recognition system indicating that an apparent iris in the plenoptic iris image is covered by a contact lens.

### Claim 20 (depends on 19)

The method of claim 19 wherein:
the one or more characteristics of the contact lens comprise a threshold curvature; and
comparing the geometric shape of the apparent iris against one or more characteristics of a contact lens comprises comparing curvature of the geometric shape of the apparent iris against the threshold curvature.