Infrared Eye Fatigue Detection via Reflected Light Intensity
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Solution Overview
Problem
Current fatigue detection methods for drivers, such as grip force analysis, have low accuracy and fail to effectively identify fatigue states, posing a safety risk during long drives.
Innovation Solution
An optical detection method and apparatus that uses infrared light to determine a driver's fatigue state by analyzing the intensity of reflected infrared light, including time periods and blink frequencies, to accurately assess eye openness and fatigue levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If grip force detection is used to assess driver fatigue, then the detection system is simple to implement, but the detection accuracy is low
Solution Approach 1:
The patent replaces the mechanical grip force detection system with an optical detection system. Specifically, it uses infrared light emission and reflection principles to detect eye state changes, substituting mechanical measurement with optical measurement to achieve higher accuracy in fatigue detection
Solution Approach 2:
The patent changes the detection parameter from grip force magnitude to reflected infrared light intensity. By monitoring changes in light intensity caused by eye closure and blinking, the system achieves more accurate fatigue assessment compared to mechanical grip force measurement
2Measurement precision
If infrared light reflection intensity is measured to detect fatigue, then the detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent introduces an infrared light as an intermediary to detect eye state changes. The infrared light serves as a mediator between the detection device and the driver's physiological state, enabling accurate fatigue detection without direct contact or complex mechanical sensors
Solution Approach 2:
The patent uses optical reflection to create a copy of the eye state information. By detecting the reflected infrared light pattern, the system obtains an optical copy of the eye closure state, which can be analyzed to determine fatigue levels without directly measuring physiological parameters
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
Improves the accuracy of fatigue detection by using infrared light to assess eye openness and blink patterns, providing timely reminders to prevent driver fatigue-related safety hazards.
Implementation Method 1
a photosensor for receiving an infrared light reflected from eyes of the user and outputting a light intensity detection signal
Data Source
AI summary
Disclosed are an optical detection method and an optical detection apparatus for a fatigue state of a user, and an optical detection device, this application relates to the field of detection technology, and is for improving accuracy of detection of the fatigue state. An optical detection method includes: irradiating eyes of the user with an infrared light; obtaining an intensity of an infrared light reflected by the eyes of the user; and determining whether the user is in a fatigue state based on the intensity of the reflected infrared light.