Wearable Eye Tracker Calibration via Remote Display Feedback
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Solution Overview
Problem
Existing eye tracking devices, particularly display-less ones, face challenges in accurately and efficiently calibrating users due to the need for meticulous guiding strategies, which often result in underperformance in terms of accuracy and speed.
Innovation Solution
A computer-implemented method and system that guides users in calibrating wearable eye tracking devices by determining calibration points and initial gaze points in fixed coordinate systems, calculating directions and distances, and updating calibration markers on a remote display device based on gaze movements, providing visual, haptic, or audio feedback to assist the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration procedures are used for display-less eye tracking devices, then the device can perform calibration, but the accuracy and speed of calibration deteriorates due to lack of visual feedback
Solution Approach 1:
A remote display device serves as an intermediary between the eye tracking device and the user. The system projects calibration markers onto the remote display, which the user views through the eye tracking device's cameras. This intermediary provides the necessary visual feedback without requiring the eye tracking device itself to have displays, resolving the contradiction between calibration accuracy and ease of operation.
Solution Approach 2:
The patent replaces traditional mechanical guidance methods (instructor physically guiding the user) with an automated optical system. The system uses cameras to track the user's gaze and computationally determines calibration points, substituting manual mechanical guidance with automated optical and computational mechanisms.
2Measurement precision
If multi-point calibration is implemented, then calibration coverage is improved, but the complexity of guiding the user deteriorates
Solution Approach 1:
The system continuously monitors the user's gaze position through cameras and provides real-time feedback by projecting calibration markers on the remote display. The markers dynamically adjust their positions based on the user's gaze trajectory, automatically guiding them through multi-point calibration without complex manual instructions. This feedback mechanism simplifies the guidance strategy while maintaining comprehensive calibration coverage.
Solution Approach 2:
The calibration markers are not static but dynamically positioned on the remote display based on real-time gaze tracking data. The system adapts the marker positions and guidance instructions dynamically according to the user's current gaze position and calibration progress, making the guidance strategy flexible and automatically adjusted rather than rigid and complex.
3Productivity
If automated gaze tracking is used, then calibration speed is improved, but the complexity of the system deteriorates
Solution Approach 1:
The eye tracking device's existing cameras and processing units are made multi-functional by using them for both normal eye tracking operations and calibration guidance. The same hardware components that perform gaze tracking are utilized to project calibration markers and monitor calibration progress, avoiding the need for separate dedicated calibration hardware and reducing overall system complexity.
Data Source
AI summary
A computer-implemented method for guiding a user in calibrating a wearable eye tracking device is disclosed. The method comprises determining a calibration point and an initial gaze point of a user wearing the eye tracking device. The method further comprises displaying a calibration marker on a remote display device at the initial gaze point, wherein the calibration marker is configured to indicate a direction. The method further comprises, in response to a movement of the gaze point in relation to the calibration point caused by movement of the user's head and/or movement of the remote display device, determining a current gaze point, and updating the calibration marker in accordance with a calculated direction and/or the distance from the current gaze point to the calibration point.