US 2026/0253236 A1 · KORDLOU MULTI-CAMERA EYE TRACKING SYSTEM WITH CONTINUOUS CALIBRATION

Abstract

An eye tracking system comprises exactly three cameras arranged in a triangular configuration around a display perimeter with a baseline-to-distance ratio between 0.48 and 0.58 for optimal stereoscopic triangulation. Each camera independently computes a gaze estimate using pupil position detection. The system performs weighted data fusion of the three independent gaze estimates to generate a fused gaze position achieving 93%+accuracy for medical applications or 78-85% accuracy for gaming applications. A geometric consistency metric based on angular deviation among the three gaze vectors enables continuous calibration monitoring. When sustained geometric inconsistency exceeds threshold across successive frames, calibration parameters are automatically updated without user interaction. The three-camera architecture provides graceful degradation: if one camera fails, two-camera operation maintains reduced but functional accuracy. The system scales across display sizes from 13 to 27 inches while maintaining the critical baseline-to-distance ratio through proportional camera positioning.

Claims40

Dependent claims

An eye tracking system for use with a display having a perimeter, the system comprising:

exactly three cameras configured to be positioned around said perimeter in a triangular configuration, wherein:
a first camera is configured to be positioned along a top portion of said perimeter;
a second camera is configured to be positioned along a bottom-left portion of said perimeter;
a third camera is configured to be positioned along a bottom-right portion of said perimeter;
wherein a baseline distance (B) between said second camera and said third camera and a working distance (D) between said display and a user's eyes define a baseline-to-distance ratio (B/D) in the range of 0.48 to 0.58;
a processing system operatively connected to said three cameras, said processing system configured to:
receive image data from each of said three cameras;
detect user eyes in said image data from each of said three cameras;
extract pupil position coordinates from said detected user eyes for each of said three cameras;
calculate three independent gaze estimates from said pupil position coordinates for said three cameras;
perform weighted data fusion of said three independent gaze estimates to generate a fused gaze estimate;
and
output said fused gaze estimate as screen coordinates on said display.

10 more elements

A method of eye tracking comprising:

positioning exactly three cameras around a display perimeter in a triangular configuration such that:
a first camera is positioned along a top portion of said perimeter;
a second camera is positioned along a bottom-left portion of said perimeter;
a third camera is positioned along a bottom-right portion of said perimeter;
wherein a baseline distance (B) between said second camera and said third camera and a working distance (D) from said display to a user's eyes define a baseline-to-distance ratio (B/D) between 0.48 and 0.58;
capturing images of said user's eyes using said three cameras;
detecting pupil positions in said images from each of said three cameras;
calculating three independent gaze estimates from said pupil positions detected by said three cameras;
assigning confidence weights to said three independent gaze estimates based on image quality metrics;
performing weighted fusion of said three independent gaze estimates according to said confidence weights to generate a fused gaze estimate;
and
outputting said fused gaze estimate as screen coordinates.

9 more elements

An eye tracking apparatus comprising:

at least three camera modules configured to be positioned around a display perimeter in a triangular arrangement, each camera module comprising:
an image sensor;
a lens assembly;
and
a mounting bracket configured to attach to said display perimeter;
wherein a baseline distance (B) between two camera modules of said at least three camera modules and a working distance (D) from said display to user eyes define a baseline-to-distance ratio (B/D) in the range of 0.48 to 0.58;
a processing unit configured to:
receive image streams from said at least three camera modules;
synchronize said image streams;
detect and track user eye features in said synchronized image streams;
generate independent gaze estimates from at least three camera modules;
fuse said independent gaze estimates using weighted averaging to produce a combined gaze estimate;
monitor calibration accuracy using geometric consistency evaluation;
and
trigger automatic recalibration when calibration accuracy degrades below a threshold.

12 more elements

Dependencies are inferred from the claim text.

Kordlou multi-camera eye tracking system with continuous calibration

Life of this patent

Kordlou multi-camera eye tracking system with continuous calibration

Life of this patent

Abstract

Claims40