Eye Tracking Calibration Using Moving Stimulus Engagement Feedback
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Solution Overview
Problem
Existing eye tracking calibration methods rely on user engagement that is difficult to verify, leading to inaccurate results, especially with inexperienced users, children, infants, and those with cognitive disabilities, and often require repetitive calibration.
Innovation Solution
A method and system that uses a moving stimulus object to track gaze points, adapting the calibration procedure based on user engagement and capability, using motion parameters and control parameters to enhance accuracy and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a static grid of stimulus points is used for calibration, then the calibration procedure is simple to implement, but the calibration accuracy deteriorates because user engagement cannot be verified
Solution Approach 1:
The patent transforms the static stimulus points into a moving stimulus object that travels along a defined trajectory. This dynamic approach allows the system to verify user engagement by tracking whether the user's gaze follows the moving stimulus, thereby resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The system implements feedback by analyzing whether captured gaze points correspond to the expected position of the moving stimulus object. This feedback mechanism verifies user engagement and allows the system to detect when the user is properly following the stimulus, improving calibration accuracy while maintaining procedural simplicity.
2Measurement precision
If a moving stimulus point is used to increase user engagement, then calibration accuracy may improve, but the procedure becomes more complex and time-consuming
Solution Approach 1:
The moving stimulus object serves multiple functions: it acts as both the calibration target and the engagement verification mechanism. By combining these functions into a single element, the system improves accuracy without proportionally increasing procedural complexity.
Solution Approach 2:
The system uses the user's own gaze tracking data to verify their engagement with the moving stimulus. This self-service approach eliminates the need for additional sensors or complex verification procedures, maintaining simplicity while improving accuracy.
3Measurement precision
If traditional calibration procedures are repeated multiple times to achieve good results, then calibration accuracy improves, but the time required increases significantly
Solution Approach 1:
The moving stimulus object continuously traces a trajectory that covers the entire display area, providing continuous calibration data throughout the procedure. This eliminates the need for multiple discrete calibration steps, reducing total calibration time while maintaining accuracy.
Solution Approach 2:
The system performs preliminary verification of user engagement during the calibration process by checking whether gaze points follow the stimulus trajectory. This preliminary check prevents the need for repeated calibration attempts, saving time while ensuring accuracy.
4Loss of time
If static stimulus points are used, then the calibration procedure is quick to complete, but it fails for users who cannot accurately fixate points such as infants and children
Solution Approach 1:
The moving stimulus object naturally attracts and guides user gaze through its motion, which is particularly effective for infants and children who are drawn to moving objects. This dynamic approach maintains quick calibration while significantly improving compatibility with diverse user populations.
Data Source
AI summary
The invention is concerned with a method for performing a calibration procedure for calibrating an eye tracking device, wherein a stimulus object is displayed within a certain display area, such that the stimulus object is at least temporarily moving along a defined trajectory and images of at least one eye of at least one user are captured during the displaying of the stimulus object.