Method and system for detection of weighted contact lenses imprinted with iris images
Inventors
Assignees
Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-12131587-B2
Publication Date
2024-10-29
Expiration Date
Abstract
Disclosed herein are methods, apparatus, and systems for iris recognition. A method for weighted spoof contact lens detection includes requesting a subject to roll or tilt head when needing access via an iris recognition device, acquiring, by the iris recognition device, iris images of a rolled head, establishing, by the iris recognition device, a horizontal axis by connecting pupils in an iris image, matching, by the iris recognition device, at least one iris in the iris image to an enrolled iris, determining, by the iris recognition device, whether the horizontal axis is within a rotational variance of an enrolled horizontal axis associated with the enrolled iris, and rejecting, by the iris recognition device, access for the subject when the horizontal axis is greater than the rotational variance of an enrolled horizontal axis.
Core Innovation
The invention provides weighted spoof contact lens detection in iris recognition by requesting a subject to roll or tilt head when needing access via an iris recognition device. After the head is rolled, the iris recognition device waits for a period of time to permit weighted spoof contact lenses to reorient on the subject's eyes, and then acquires iris images of the rolled head.
The iris recognition device establishes a horizontal axis by connecting pupils in an iris image and matches at least one iris to an enrolled iris. The device determines whether the horizontal axis is within a rotational variance of an enrolled horizontal axis associated with the enrolled iris and rejects access when the horizontal axis is greater than the rotational variance.
In a further approach, the device acquires non-rolled head iris images and establishes a non-rolled head horizontal axis by connecting pupils. It then acquires rolled head iris images after a period of time, establishes a rolled head horizontal axis by connecting pupils, matches at least one iris to the enrolled iris, and determines whether the rolled head horizontal axis is within rotational variance of the enrolled horizontal axis or within rotational variance of the non-rolled horizontal axis.
Claims Coverage
The document includes four independent claims. Across these claims, the inventive features center on prompting head roll or tilt, waiting to permit weighted spoof contact lens reorientation, using a horizontal axis established by connecting pupils, and deciding access acceptance or rejection based on rotational variance relative to enrolled and, in one claim, non-rolled horizontal axes.
Head roll/tilt prompting for access via iris recognition device
Requesting a subject to roll or tilt head when needing access via an iris recognition device.
Waiting for weighted spoof lens reorientation before rolled-head capture
Waiting, by the iris recognition device, for a period of time after the head is rolled to acquire the iris images, wherein the period of time permits weighted spoof contact lenses to reorient on the subject's eyes.
Horizontal axis from pupil connection for rolled-head iris images
Establishing, by the iris recognition device, a horizontal axis by connecting pupils in an iris image.
Enrolled iris matching and rotational-variance determination for access rejection
Matching, by the iris recognition device, at least one iris in the iris image to an enrolled iris; determining whether the horizontal axis is within a rotational variance of an enrolled horizontal axis associated with the enrolled iris; rejecting access for the subject when the horizontal axis is greater than the rotational variance of the enrolled horizontal axis.
Non-rolled then rolled comparison using rotational variance thresholds
Acquiring non-rolled head iris images; establishing a non-rolled head horizontal axis by connecting pupils in a non-rolled head iris image; matching at least one iris to an enrolled iris; determining whether the non-rolled head horizontal axis is within a rotational variance of an enrolled horizontal axis; waiting for a period of time after a head is rolled to acquire rolled head iris images; establishing a rolled head horizontal axis by connecting pupils in a rolled head iris image; matching at least one iris in the rolled head iris image to the enrolled iris; determining whether the rolled head horizontal axis is within the rotational variance of the enrolled horizontal axis or within the rotational variance of the non-rolled horizontal axis; rejecting access when the rolled horizontal axis is greater than the rotational variance for at least one of those comparisons.
Iris recognition device architecture for rolled-head spoof detection
An iris recognition device comprising an image capture device configured to capture iris images of a rolled head of a subject needing access via the iris recognition device, wherein acquisition of the iris images of the rolled head occur after a period of time has elapsed to permit weighted spoof contact lenses to reorient on the subject's eyes; and an iris recognition module configured to establish a horizontal axis by connecting pupils in an iris image; match at least one iris in the iris image to an enrolled iris; determine whether the horizontal axis is within a rotational variance of an enrolled horizontal axis associated with the enrolled iris; and reject access for the subject when the horizontal axis is greater than the rotational variance of an enrolled horizontal axis.
Rotational variance check against enrolled or non-rolled horizontal axis
Determining whether the horizontal axis is within a rotational variance of an enrolled horizontal axis associated with the enrolled iris or is within a rotational variance of a non-rolled horizontal axis; rejecting access for the subject when the horizontal axis is at least one of greater than the rotational variance of the enrolled horizontal axis or greater than the rotational variance of the non-rolled horizontal axis.
Overall, the independent claims cover methods and a device that prompt head roll or tilt, wait to permit weighted spoof contact lens reorientation, form a horizontal axis by connecting pupils, match at least one iris to an enrolled iris, and decide access by determining whether the horizontal axis is within or greater than a rotational variance relative to enrolled and, in some configurations, non-rolled horizontal axes.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
Interested in licensing this patent?