Stereo Vision Operator Alertness Detection
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Solution Overview
Problem
Monocular machine vision is inadequate for reliably detecting operator alertness, especially when the operator does not face forward or wears eyeglasses, as it lacks depth perception and is inefficient in determining three-dimensional characteristics.
Innovation Solution
A system using stereo vision with an image processor and analyzer to determine if an operator's eye is visible and assess their alertness by analyzing three-dimensional representations of the operator's position and movement, even when they are not facing forward or wearing eyeglasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If monocular machine vision is used to detect operator alertness, then the system complexity is reduced, but the measurement precision and reliability of operator position and movement detection deteriorate due to lack of depth perception
Solution Approach 1:
The patent transitions from monocular (2D) vision to stereo (3D) vision by introducing a second imaging unit positioned at a different location. This dimensional change enables depth perception through triangulation, allowing accurate determination of operator position and movement in three-dimensional space, which directly resolves the measurement precision problem while maintaining reasonable system complexity
2Device complexity
If monocular vision is used to detect operator alertness, then the device complexity is lower, but the reliability of detection deteriorates when operator does not face forward or wears eyeglasses
Solution Approach 1:
By adding the depth dimension through stereo vision, the system can accurately locate the operator's head position and orientation in 3D space regardless of facial direction. This enables reliable detection of alertness indicators even when the operator looks away or wears eyeglasses, as the system can track head position and movement patterns from multiple viewing angles
Solution Approach 2:
The stereo vision system provides multi-functional capability by simultaneously capturing images from two different positions, enabling the system to analyze operator alertness through multiple parameters (head position, movement patterns, orientation) rather than relying on a single viewing angle, thus improving detection reliability across various operator states
3Device complexity
If monocular vision is used, then the system is simpler, but the capability to determine three-dimensional characteristics of operator position and movement is insufficient
Solution Approach 1:
The patent directly addresses the three-dimensional detection requirement by implementing stereo vision with two imaging units positioned at different locations. This configuration enables the system to calculate depth through triangulation and accurately determine spatial coordinates (x, y, z) of the operator's head, providing complete three-dimensional characterization of position and movement
Data Source
AI summary
A method and system for detecting operator alertness of an operator of a vehicle or machine comprises an image processor and an analyzer. The image processor determines whether at least one eye of an operator is visible and determines whether the operator is generally facing forward with respect to the vehicle. The analyzer applies at least one of position analysis and motion analysis to a three dimensional representation of an operator to determine alertness of the operator if at least one eye of operator is not visible or If the operator is generally facing forward.