Eye Opening Degree Detection System for Vehicle Doze Monitoring
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Solution Overview
Problem
Existing eye opening degree detection systems for vehicles face inaccuracies in bad light environments, leading to unstable doze detection due to varying threshold values for eye opening and closing determination.
Innovation Solution
A system utilizing multiple cameras to image a driver's eyes, with a one eye opening degree calculation unit, selection unit, and determination unit that creates pixel value histograms to stabilize eye opening degree calculations by comparing images from different cameras and adjusting coefficients based on light environment conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threshold value for determining eye opening and closing is changed in a bad light environment, then the determination of eye opening and closing can be performed, but the eye opening degree detected using the image imaged in a bad light environment becomes inaccurate and the determination of dozing becomes unstable
Solution Approach 1:
The patent divides the eye opening degree detection into multiple independent components: a first value obtained from pixel value comparison and a second value obtained from histogram analysis. By segmenting the detection process into multiple independent measurements, the system can combine these values to obtain a more accurate and stable eye opening degree even in bad light environments where single-method detection fails.
2Reliability
If multiple imaging devices are used to generate images while shifting time, then the reliability of eye opening degree detection is improved, but the device complexity increases
Solution Approach 1:
The patent employs a dynamic selection mechanism that adaptively chooses between different calculation methods based on environmental conditions. The system determines whether to use the first value (pixel comparison) or second value (histogram) or a combination thereof based on light environment assessment. This dynamic approach maintains high reliability across varying conditions without requiring permanently active multiple imaging devices, thereby reducing overall system complexity.
Data Source
AI summary
An object of the present invention is to provide an eye opening degree detection system that can accurately and stably calculate an eye opening degree. The eye opening degree detection system includes imaging devices that generate images including regions of both eyes, a one eye opening degree calculation unit that calculates each one eye opening degree of the left and right eyes of a first image, an eye opening degree selection unit that selects a correctly-calculated one eye opening degree, an eye opening degree calculation unit that calculates an eye opening degree on the basis of the one eye opening degree and an eye opening degree determination unit that compares the eye opening degree calculated on the basis of the first image with an eye opening degree calculated on the basis of a second image prior to the first image to determine the propriety of the eye opening degree.