Driver Gaze Detection Using Steering-Based Allowable Range
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Solution Overview
Problem
Conventional driver state detection devices inaccurately judge a driver as distracted when information on the road shape is unavailable or when a turn signal is not operated, leading to false positives during steering wheel operations.
Innovation Solution
A driver state detection device with a driver monitor camera and control device that adjusts the allowable range for facial orientation and line-of-sight based on steering wheel operations and vehicle speed, expanding the range during curved sections to prevent false distractions judgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the allowable range is expanded by a predetermined amount based on road shape information, then the accuracy of distracted driving detection is improved when curves are detected, but the system fails to expand the range when road shape information is unavailable, causing false positives during steering operations
Solution Approach 1:
The system changes the parameter for determining allowable range from road shape information to steering wheel operation information. When road shape information is unavailable, the system uses steering wheel operation parameters (rotation amount, rotation speed) to dynamically adjust the allowable range, ensuring consistent detection accuracy across different information availability conditions
Solution Approach 2:
The steering wheel operation information serves as an intermediary parameter that indirectly reflects road conditions. Instead of directly using unavailable road shape information, the system uses the driver's steering actions as a proxy to infer whether the vehicle is navigating a curve, thereby expanding the allowable range appropriately
2Adaptability or versatility
If the allowable range is expanded based on turn signal operation, then the system adapts to lane change scenarios, but it expands the range even without turn signal operation, causing false positives when steering wheel is operated normally
Solution Approach 1:
The system implements dynamic adjustment of the allowable range based on real-time steering wheel operation characteristics. The expansion amount and direction are continuously updated according to the actual steering input (rotation amount, rotation speed), allowing the range to adapt naturally to lane changes only when actual steering actions occur, rather than relying on turn signal status which may not reflect actual driving intentions
3Ease of manufacture
If a fixed predetermined amount is used to expand the allowable range, then the system is simple to implement, but it cannot accurately adapt to different steering operation intensities and vehicle speeds
Solution Approach 1:
The system transitions from a static fixed expansion amount to a dynamic expansion amount that varies with steering operation intensity and vehicle speed. The allowable range expansion is calculated based on real-time parameters including steering wheel rotation amount, rotation speed, and vehicle speed, ensuring the range accurately matches the driver's actual viewing requirements under different driving conditions
Solution Approach 2:
The system changes multiple parameters simultaneously (steering wheel rotation amount, rotation speed, vehicle speed) to determine the allowable range expansion, rather than using a single fixed value. This multi-parameter approach allows the system to accurately adapt to different driving scenarios while maintaining reasonable computational complexity
Data Source
AI summary
A driver state detection device provided with a driver monitor camera configured to capture the face of a driver of a vehicle to generate a facial image of the driver and a control device. The control device is configured so as to detect the facial orientation or the line-of-sight direction of the driver based on the facial image, judge that the driver is driving distracted when the facial orientation or the line-of-sight direction of the driver is maintained for greater than or equal to a predetermined time period at the outside from the allowable range allowed as the facial orientation or the line-of-sight direction of the driver, and set the allowable range based on an operating parameter which is in a correlative relationship with steering operation of the steering wheel of the vehicle and the speed of the vehicle.