Iris detection

By estimating the pupil position and optical axis in a 3D coordinate system, and combining iris ellipse fitting and eyelid detection, the calibration error caused by pupil eccentricity in eye-tracking systems is solved, improving the accuracy and stability of gaze estimation.

CN122157339APending Publication Date: 2026-06-05TOBII TECH AB
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TOBII TECH AB
Filing Date
2025-12-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing eye-tracking systems suffer from decreased gaze estimation accuracy during calibration due to pupil decentering, especially with significant calibration errors caused by changes in ambient lighting, making it difficult to accurately determine the visual axis.

Method used

By estimating the pupil position and approximate optical axis in a 3D coordinate system, estimating the iris center based on the pupil position, and transforming the iris contour to the image coordinate system, the iris contour is accurately determined by combining iris ellipse fitting and eyelid detection.

Benefits of technology

This improves the gaze estimation accuracy of the eye-tracking system, reduces calibration errors caused by pupil decentering, and enhances the system's stability and accuracy under different lighting conditions.

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Abstract

A method for detecting an iris in a user eye image captured by a camera of an eye tracking system, the method comprising: processing the image to estimate a pupil position in a 3D coordinate system; estimating an approximate optical axis in the 3D coordinate system; estimating an iris center in the 3D coordinate system based on the pupil position in the 3D coordinate system; and estimating an iris contour in the 3D coordinate system as a circle with an estimated iris diameter centered at the iris center lying in a plane having a normal parallel to the approximate optical axis; and estimating an image iris contour by transforming the iris contour in the 3D coordinate system to an image coordinate system.
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