Vehicle Drowsiness Detection Using Sitting-Height Threshold Adjustment
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Solution Overview
Problem
Existing drowsiness determination systems struggle with accuracy due to individual differences in occupant reactions to vehicle vibrations, particularly when determining drowsiness based solely on head movement information.
Innovation Solution
A drowsiness determination system that incorporates vibration information, head movement information, and sitting height information to enhance accuracy by using threshold values adjusted based on sitting height, and includes features like image processing for estimating sitting height and determining drowsiness through comparison with adjusted thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If drowsiness determination is based solely on head movement information, then the system is simple to operate, but the determination accuracy is reduced due to individual differences in occupant reactions
Solution Approach 1:
The patent applies parameter changes by introducing sitting height as an additional parameter to adjust the threshold values for drowsiness determination. The determination threshold is no longer fixed but varies based on the occupant's sitting height, which accounts for individual differences in reaction to vehicle vibrations. This allows the system to maintain simplicity in operation while improving determination accuracy through dynamic threshold adjustment.
Solution Approach 2:
The system transitions from a static threshold approach to a dynamic one by automatically adjusting determination thresholds based on detected sitting height. The threshold values are no longer fixed but adapt to each occupant's physical characteristics, making the system more accurate without requiring manual input or complex operation from the user.
2Device complexity
If fixed threshold values are used for drowsiness determination, then the system is simple to implement, but individual differences in occupant reactions reduce accuracy
Solution Approach 1:
The patent changes the parameter approach by replacing fixed threshold values with dynamic thresholds that depend on sitting height. The determination process uses the formula comparing head movement amount against a threshold that is adjusted based on the detected sitting height parameter, thereby accounting for individual differences without significantly increasing system complexity.
Solution Approach 2:
The system performs preliminary action by automatically detecting the occupant's sitting height before conducting drowsiness determination. This preliminary detection allows the system to pre-adjust the appropriate threshold values for that specific occupant, ensuring accurate determination without requiring manual setup or complex real-time adjustments during the actual drowsiness check.
3Measurement precision
If sitting height information is acquired and used for threshold adjustment, then determination accuracy is enhanced, but the system complexity increases
Solution Approach 1:
The system applies self-service by automatically detecting sitting height and using it to adjust determination thresholds without requiring manual input from the occupant. The sitting height detection is performed autonomously by the system's existing sensors, and the threshold adjustment is automatically calculated and applied, maintaining ease of operation while improving accuracy.
Data Source
AI summary
A drowsiness determination system includes a first acquirer, a second acquirer, a third acquirer, and a determiner. The first acquirer acquires vibration information indicating the vibration of a vehicle. The second acquirer acquires head information indicating a variation in the movement of the head of an occupant. The third acquirer acquires sitting height information indicating the sitting height of the occupant. The determiner determines whether the occupant is drowsy based on the head information and the sitting height information, when the vibration information indicates the occurrence of the vibration of the vehicle.