Eye Tracking Calibration via Gaze Verification
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Solution Overview
Problem
Existing eye tracking devices face accuracy issues during calibration when the subject is not gazing at the target position, leading to deteriorated calibration accuracy.
Innovation Solution
An eye tracking device and method that utilize a stereo camera system and light sources to detect the position of the pupil center and corneal reflex center, determining whether the subject is gazing at a target position by assessing the distance and angle between these points within predetermined thresholds, and performing calibration only when the subject is correctly aligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If calibration is performed assuming a certain target position is gazed, then calibration process is simple, but calibration accuracy deteriorates when the subject is not gazing at the target position
Solution Approach 1:
The gaze determining unit performs preliminary verification before calibration by checking whether the subject is gazing at the target position. This preliminary action ensures that calibration is only performed when the subject's gaze is correctly positioned, preventing accuracy deterioration while maintaining a simple calibration process.
Solution Approach 2:
The system implements feedback by continuously monitoring the subject's gaze position through the gaze determining unit and using this information to control the calibration unit. This feedback mechanism ensures that calibration accuracy is maintained by only performing calibration when the subject is properly positioned.
2Productivity
If calibration is performed without verifying gaze position, then calibration speed is fast, but calibration accuracy deteriorates
Solution Approach 1:
The gaze determining unit performs a quick preliminary check before calibration to verify the subject's gaze position. This preliminary action is designed to be rapid while ensuring accuracy, allowing the system to maintain both fast calibration speed and high accuracy by filtering out incorrect calibration attempts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate calibration by confirming the subject's gaze before performing calibration, thereby preventing accuracy deterioration and enhancing the reliability of eye tracking device calibration.
Implementation Method 1
at least one light source configured to irradiate detection light for eye tracking to at least one eyeball of a subject
Implementation Method 2
at least one imager configured to capture image of the at least one eyeball
Data Source
AI summary
An eye tracking device includes at least one light source configured to irradiate detection light for eye tracking to at least one eyeball of a subject; at least one imager configured to capture image of the at least one eyeball; a position detecting unit configured to detect a position of a pupil center of the at least one eyeball and a position of a corneal reflex center of the at least one eyeball from the captured image; a gaze determining unit configured to determine whether the subject is gazing at a target position based on the position of the pupil center and the position of the corneal reflex center; and a calibration unit configured to perform calibration for the eye tracking based on the captured image when the gaze determining unit determines that the target position is gazed at by the subject.