Driver Monitoring Diffuser Check for Eye-Safe Illumination
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Solution Overview
Problem
The risk of eye damage from direct light irradiation in driver monitoring systems is exacerbated by a loose or improperly positioned diffuser, necessitating a method to ensure the diffuser is functional and correctly arranged in the beam path.
Innovation Solution
A method and device that utilize image processing techniques to determine the functionality and position of the diffuser by comparing illumination differences across image sections, applying filters to enhance edge detection, and analyzing pixel intensity to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the illumination device is activated to illuminate the driver's head for monitoring, then the driver monitoring function is improved, but the risk of eye damage increases if the diffuser is loose or improperly positioned
Solution Approach 1:
The system performs a preliminary check of the diffuser's position and function before activating the illumination device for driver monitoring. The control unit verifies that the diffuser is properly positioned and scattering light correctly, ensuring that the illumination intensity at the driver's eyes remains below the damage threshold before allowing the monitoring function to operate.
Solution Approach 2:
The system continuously monitors the light scattering effect of the diffuser by analyzing the illumination pattern in the captured images. The control unit compares the actual illumination distribution against expected patterns to detect if the diffuser has become loose or improperly positioned, and automatically deactivates the illumination device when anomalies are detected, providing real-time feedback control to prevent eye damage.
2Object-affected harmful factors
If the diffuser is positioned to scatter light effectively, then eye safety is improved, but the illumination intensity for driver monitoring may be reduced
Solution Approach 1:
The system adjusts the illumination parameters, specifically increasing the light output intensity of the VCSEL illumination device, to compensate for the light scattering effect of the diffuser. By dynamically changing the illumination intensity parameter, the system maintains sufficient lighting for driver monitoring while ensuring the diffuser continues to scatter light effectively to keep eye exposure below damage thresholds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures the diffuser is correctly positioned, preventing eye damage by deactivating the illumination device if the diffuser is not functional, thereby enhancing driver safety.
Implementation Method 1
a diffuser which scatters the light in such a way that the intensity of the light hitting the eyes is too low to damage the eyes
Implementation Method 2
an image capturing device for capturing an image of the driver's head illuminated using the illumination device
Data Source
AI summary
A method for determining a state of a driver monitoring device includes generating a first image. The first image is based on an image of an interior illuminated by means of an illumination device. The method includes dividing the first image into multiple image sections. The method includes determining a maximum intensity of pixels of a first group of image sections of the first image and an average intensity of a second group of image sections of the first image and determining a difference in illumination of the first image by dividing the maximum intensity of the first group by the mean intensity of the second group. The method includes determining whether or not a diffuser is functional and properly arranged and activating or deactivating the illumination device for driver monitoring if the difference in illumination of the first image is smaller or greater than a lower threshold value.