Gaze Detector Posture Calibration via Reference Parameters
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Solution Overview
Problem
Existing gaze detection technologies, such as the corneal reflection method, are affected by personal differences in corneal shape and the presence of eyeglasses or contact lenses, requiring frequent recalibration when head posture changes, which burdens the user with repetitive calibration processes.
Innovation Solution
A gaze detector system that includes an imaging unit, a detector, a generation unit, a calibration unit, and a correction unit to capture and analyze images, detect head postures and gaze directions, generate gaze direction distributions, select a reference posture, calculate calibration parameters, and correct gaze directions for varying head postures, thereby automatically adjusting for posture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed for each head posture change, then measurement precision is improved, but ease of operation deteriorates due to frequent recalibration requirements
Solution Approach 1:
The system performs preliminary calibration for multiple head postures in advance, storing calibration parameters for each posture. When a posture change is detected, the system retrieves pre-computed parameters instead of requiring recalibration, thus maintaining precision while reducing operational burden.
Solution Approach 2:
The system changes calibration parameters based on detected head posture. By maintaining multiple sets of calibration parameters corresponding to different postures and selecting the appropriate set dynamically, the system adapts to posture changes without requiring user recalibration.
2Measurement precision
If multiple standard points are used for calibration, then measurement precision is improved, but loss of time increases due to longer calibration processes
Solution Approach 1:
The system performs comprehensive calibration using multiple standard points in advance, storing the results as reusable calibration parameters. This preliminary comprehensive calibration eliminates the need for time-consuming recalibration processes during actual use.
Solution Approach 2:
The system creates calibration parameter sets for different postures based on reference calibration data. Instead of performing full multi-point calibration for each posture, the system generates and stores parameter copies that can be quickly applied when postures are detected.
3Adaptability or versatility
If calibration parameters are stored for multiple head postures, then adaptability is improved, but device complexity increases due to parameter management requirements
Solution Approach 1:
The system segments calibration parameters by head posture, creating separate parameter sets for different posture categories. This segmentation allows organized storage and efficient retrieval based on detected posture, managing complexity through structured organization.
Solution Approach 2:
The calibration parameter storage system is designed to handle multiple postures universally. A single parameter storage mechanism serves all posture types, with automatic selection based on detected posture, rather than requiring separate dedicated systems for each posture.
Data Source
AI summary
A detector detects head postures and gaze directions from images of a person to be measured captured by an imaging unit; a generation unit generates a gaze direction distribution with respect to each of the head postures, from the head postures and the gaze directions detected by the detector; a calibration unit determines predetermined one of the head postures as a reference posture, and calculates calibration parameters to be used to calibrate the gaze direction distribution with respect to the reference posture; and a correction unit corrects the gaze direction distributions with respect to the head postures other than the reference posture by using the calibration parameters calculated by the calibration unit. This reduces the influence on the calibration which may vary due to change in the head posture.