Steering-Wheel Camera Face Estimation for Driver State Determination
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Solution Overview
Problem
The position change of the steering wheel in vehicles with integrated driver monitoring cameras causes a delay in determining the driver's state, as the camera's imaging range changes, affecting the accuracy and speed of face recognition.
Innovation Solution
A driver state determination apparatus that estimates the driver's face position after a steering wheel position change using position change information, allowing for faster and more accurate state determination by processing a predetermined range of the image and adjusting determination thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the driver monitoring camera is integrated on the steering wheel to improve monitoring coverage, then the adaptability of the monitoring system is improved, but the determination time of driver state increases due to position changes
Solution Approach 1:
The system performs preliminary actions by acquiring steering wheel position change information and estimating the new face position in advance before actual driver state determination. This allows the system to prepare the search region and adjustment parameters beforehand, reducing the time required when position changes occur during operation.
Solution Approach 2:
The system uses feedback from position change information acquisition to continuously adjust the face position estimation. By monitoring steering wheel position changes and feeding this information back into the position estimation algorithm, the system dynamically adapts to position changes without requiring full re-determination of driver state.
2Adaptability or versatility
If the driver monitoring camera is integrated on the steering wheel to improve adaptability, then the versatility of the monitoring system is improved, but the measurement precision of driver state deteriorates due to position changes
Solution Approach 1:
The system changes parameters by adjusting the face position estimation based on steering wheel position change information. When the steering wheel position changes, the system modifies the search region and position adjustment parameters accordingly, maintaining measurement precision despite camera position changes.
Solution Approach 2:
The system implements dynamic adaptation by continuously updating the face position estimation as the steering wheel position changes. Rather than using a fixed search region, the system dynamically adjusts the search region and position parameters based on real-time position change information, maintaining determination accuracy throughout operation.
3Adaptability or versatility
If the driver monitoring camera is integrated on the steering wheel to improve adaptability, then the versatility of the monitoring system is improved, but the productivity of driver state determination deteriorates due to position changes
Solution Approach 1:
The system performs preliminary calculations by estimating the new face position based on position change information before actual driver state determination begins. This preliminary positioning allows the system to focus processing on a smaller, pre-calculated search region, improving determination speed while maintaining adaptability to position changes.
Solution Approach 2:
The system applies local quality optimization by concentrating processing resources on the estimated face position region rather than analyzing the entire image. By using position change information to define a localized search region, the system improves determination speed while maintaining accurate driver state assessment in the critical facial area.
Data Source
AI summary
A driver state determination apparatus determines the state of a driver's face based on an image captured by a driver monitoring camera provided for the steering wheel. The device comprises a driver state determination unit that determines the driver's state from the image and a position change information acquisition unit that acquires position change information of the steering wheel. The driver state determination unit estimates the position of the driver's face in the image after the position change based on the position of the driver's face in the image before the position change and the position change information. It then determines the driver's state from the estimated position of the driver's face and the image after the position change.