Eye State Determination with Face-Orientation Reference Switching
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Solution Overview
Problem
Existing eye determination systems inaccurately assess the open or closed state due to variations in face orientation, particularly when the face swings left or right, leading to significant changes in measured eye openness values.
Innovation Solution
An open or closed eye determination apparatus and method that adjusts open and closed eye reference values based on detected face orientation, using a video acquisition unit, face orientation detection, eye image extraction, and open or closed eye determination units to precisely determine eye state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed reference value is used for eye openness determination, then the determination process is simple, but the precision of eye state determination deteriorates when face orientation changes
Solution Approach 1:
The reference value is changed from a fixed static value to a dynamic value that automatically adjusts according to the detected face orientation angle. The determination unit selects different reference values based on the yaw angle ranges, making the system adaptive to different face orientations and maintaining high determination precision without requiring complex manual calibration.
Solution Approach 2:
The system changes the reference parameter (eye openness threshold) based on the face orientation parameter (yaw angle). By detecting the face orientation and selecting appropriate reference values from a set of pre-defined values corresponding to different orientation ranges, the system maintains accurate eye state determination across various face positions.
2Ease of manufacture
If the camera is positioned diagonally above the face, then the device structure is simplified, but the measurement precision of eye openness deteriorates when the face swings left or right
Solution Approach 1:
The system continuously detects the face orientation angle and uses this feedback information to dynamically adjust the reference value for eye openness determination. This closed-loop approach compensates for the perspective distortion caused by the diagonal camera position, maintaining measurement precision without requiring the camera to be positioned directly in front of the face.
Solution Approach 2:
The system compensates for the fixed diagonal camera position by changing the reference parameter based on the detected face orientation. Different reference values are applied for different yaw angle ranges, effectively correcting the perspective distortion and maintaining accurate eye state determination despite the simplified camera installation position.
Data Source
AI summary
A video acquisition unit in an open or closed eye determination apparatus acquires video data from a camera. A face orientation detection unit detects a face orientation based on a face image in the video data acquired by the video acquisition unit. An eye image extraction unit extracts an eye image including an eye region based on the face image in the video data acquired by the video acquisition unit. An open or closed eye determination unit determines an open or closed eye state based on an amount of eye openness acquired from the eye image, an open eye reference value, and a closed eye reference value. The open or closed eye determination unit has the open eye reference value and the closed eye reference value corresponding to a face orientation and switches the open eye reference value and the closed eye reference value based on the face orientation.