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Related Experiment Video

Updated: Aug 1, 2025

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior

Published on: November 14, 2018

An Automatic Calibration Method for Kappa Angle Based on a Binocular Gaze Constraint.

Jiahui Liu^1,2, Jiannan Chi^1,2,3, Hang Sun^1,2

¹School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Sensors (Basel, Switzerland)

|April 28, 2023

Summary

This summary is machine-generated.

This study introduces an automatic kappa-angle calibration method for 3D gaze tracking, eliminating complex user calibration. The new approach achieves high accuracy, enabling instant use of gaze-tracking systems.

Keywords:

binocular constraint eye-tracking interaction gaze estimation kappa angle user calibration

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Area of Science:

Ophthalmology
Computer Vision
Human-Computer Interaction

Background:

Kappa-angle calibration is crucial for accurate 3D gaze tracking.
Current explicit user calibration methods are complex and time-consuming.

Purpose of the Study:

To develop an automatic kappa-angle calibration method for gaze tracking.
To improve the efficiency and usability of gaze-tracking systems.

Main Methods:

Utilized 3D corneal centers and optical axes of both eyes.
Established an objective function based on the coplanar constraint of visual axes.
Employed a differential evolution algorithm for kappa-angle iteration.

Main Results:

Achieved gaze accuracy of 1.3° (horizontal) and 1.34° (vertical).
Results are within acceptable gaze-estimation error margins.
Demonstrated the feasibility of automatic calibration during screen browsing.

Conclusions:

The proposed automatic kappa-angle calibration method significantly simplifies the process.
This advancement is vital for the immediate application of gaze-tracking technology.
The method enhances the practical utility of 3D gaze tracking systems.