Gaze Point Correction Using Eye Tracking History
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Solution Overview
Problem
Existing methods for correcting gaze point positions are either environment-dependent and ineffective or burden users with explicit input requirements, failing to accurately and effortlessly adjust gaze point positions.
Innovation Solution
An optical apparatus with a display unit, processor, and memory that estimates gaze points from image signals, displays a marker, and corrects its position based on gaze point position history and rotation angle history to reduce shifts between actual and estimated gaze points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gaze point correction is based on environment-dependent methods (scenery detection), then the system can operate without user input, but the correction accuracy deteriorates due to variability in viewing conditions
Solution Approach 1:
The system implements feedback by detecting the user's actual gaze point through camera imaging, comparing it with the estimated gaze point, and using the detected offset to correct the estimation. This closed-loop feedback mechanism maintains accuracy across varying environmental conditions without requiring user input.
Solution Approach 2:
The patent replaces environment-dependent computational methods with a direct optical measurement approach using camera imaging to detect the pupil center position. This substitution of mechanical/optical measurement for environmental analysis provides consistent accuracy independent of scenery or viewing conditions.
2Measurement precision
If gaze point correction requires explicit user indication (button pressing), then the correction accuracy improves, but the ease of operation deteriorates due to user burden
Solution Approach 1:
The system performs self-calibration by automatically detecting the offset between estimated and actual gaze points during normal operation. The correction mechanism operates autonomously without requiring user initiation or explicit input, making the system both accurate and easy to use.
Solution Approach 2:
The continuous feedback loop automatically detects and corrects gaze point offsets without user intervention. The system monitors the relationship between estimated and actual gaze points and applies real-time corrections, eliminating the need for explicit user indication while maintaining high accuracy.
3Device complexity
If gaze point estimation uses simple methods, then the ease of operation improves, but the measurement precision deteriorates due to shifts between actual and estimated positions
Solution Approach 1:
The system employs feedback-based correction where the offset between estimated and camera-detected gaze points is continuously measured and used to adjust the estimation algorithm. This feedback mechanism maintains high precision without requiring complex hardware modifications.
Solution Approach 2:
The patent adjusts estimation parameters dynamically based on the detected offset between estimated and actual gaze points. By changing the correction parameters in real-time, the system maintains accuracy without increasing overall device complexity.
Data Source
AI summary
An optical apparatus includes an estimating unit configured to estimate a gaze point position of a user from an image signal of an eyeball of the user, a display unit configured to display a marker indicating the gaze point position estimated by the estimating unit, and a correcting unit configured to correct a position of the marker displayed on the display unit based on at least one of position history of the gaze point position and rotation angle history of the eyeball.