Driver State Detection Using Shoulder-Width Adaptive Thresholds
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Solution Overview
Problem
Existing driving state monitoring systems face challenges in accurately determining a driver's state due to variations in camera angle and focal length, as well as differences in driver size, leading to inconsistent angle thresholds and potential misclassification of distracted or looking-aside states.
Innovation Solution
A driving state determination apparatus that detects the positions of a driver's shoulders and calculates their width to set dynamic determination thresholds, allowing for accurate assessment of driving states regardless of driver size or camera perspective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed angle thresholds are used for determining distracted state, then the determination process is simple, but the accuracy deteriorates due to variations in camera angle, focal length, and driver size
Solution Approach 1:
The patent applies the dynamics principle by transforming fixed thresholds into dynamic thresholds that adapt to individual drivers. The system calculates a shoulder width for each driver and uses this measurement to dynamically adjust the angle thresholds. This allows the determination process to remain relatively simple while significantly improving accuracy by accounting for variations in driver size, camera angle, and focal length.
Solution Approach 2:
The patent implements parameter changes by modifying the threshold parameters based on the driver's shoulder width. Instead of using constant angle thresholds, the system calculates adjusted thresholds that are proportional to the measured shoulder width. This parameter adaptation resolves the contradiction by maintaining simple determination logic while improving measurement precision through personalized threshold calibration.
2Ease of manufacture
If fixed determination thresholds are used, then the system is easy to implement, but it cannot accurately determine driving states for drivers of different sizes
Solution Approach 1:
The patent applies preliminary action by performing shoulder width measurement and threshold calculation before the actual driving state determination. The system first captures the driver's image, measures the shoulder width, calculates the appropriate thresholds, and then uses these personalized thresholds for state determination. This preliminary calibration step ensures reliable determination for drivers of all sizes while keeping the overall system easy to implement.
Solution Approach 2:
The system implements self-service by automatically adapting to each driver without requiring manual configuration. The driver's shoulder width is automatically measured from captured images, and the appropriate thresholds are automatically calculated and applied. This self-adjusting mechanism maintains ease of implementation while significantly improving determination reliability across different driver sizes.
3Measurement precision
If dynamic thresholds based on shoulder width are used, then determination accuracy improves, but the processing complexity increases
Solution Approach 1:
The patent applies universality by using the shoulder width measurement for multiple purposes. The same shoulder width data is used not only to calculate angle thresholds but also to determine detection box sizes and other determination parameters. This multi-functional use of a single measurement minimizes the increase in processing complexity while maximizing determination accuracy across multiple aspects of driver state analysis.
Data Source
AI summary
A position detection unit detects positions of right and left shoulders of a driver, and positions of at least two body parts of the driver from a driver image obtained by capturing an image of the driver. A shoulder width calculation unit calculate a width of shoulders of the driver based on the detected positions of the right and left shoulders. A threshold determination unit determines at least one determination threshold based on the calculated width of shoulders. A determination unit determines a driving state of the driver by using the positions of the at least two detected body parts detected by the position detection unit and the at least one determination threshold determined by the threshold determination unit.