Motorized Lens System for Driver Face Image Normalization
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Solution Overview
Problem
Conventional drowsy driving detection systems face challenges in accurately extracting and normalizing driver face images due to varying driving positions and face sizes, requiring frequent camera recalibration and increasing processing time.
Innovation Solution
An apparatus and method that adjust pan, tilt, and zoom parameters using motors and a controller to center and normalize the driver's face image, allowing for automatic adjustment of the lens to maintain a consistent image size and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed camera is used to photograph the driver's face, then the camera structure is simple, but the face image position and size vary due to different driving positions, requiring frequent recalibration
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed camera with a movable lens system that can dynamically adjust its position and orientation. The lens is controlled by motors to move in horizontal, vertical, and zoom directions, allowing the system to adapt to different driver positions and maintain consistent face image capture without requiring frequent recalibration.
2Device complexity
If software-based face area extraction is used, then the system structure is simple, but the extraction time is long and processing speed is reduced
Solution Approach 1:
The patent applies mechanics substitution by replacing the software-based face area extraction method with a hardware-based optical system. The movable lens, controlled by motors, physically adjusts to capture the face area directly, eliminating the need for time-consuming software processing while maintaining system structural simplicity.
3Measurement precision
If the camera position is fixed according to individual drivers, then the face image can be captured, but recalibration is required whenever driving habits change or other drivers use the vehicle
Solution Approach 1:
The patent applies self-service by implementing an automatic control system that uses a controller to manage the movable lens. The system automatically detects and tracks the driver's face, adjusting the lens position and orientation without requiring manual recalibration. This allows the system to adapt to different drivers and driving habits autonomously, maintaining measurement precision while eliminating the need for frequent recalibration.
4Manufacturing precision
If the lens is moved to adjust pan, tilt, and zoom parameters, then the face image can be centered and normalized, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a multi-functional control system where a single controller manages multiple motors that control the lens in various directions (horizontal, vertical, zoom). This integrated approach allows the system to perform multiple functions (pan, tilt, zoom adjustments) through a unified control architecture, achieving high manufacturing precision while minimizing the increase in device complexity through functional integration.
Data Source
AI summary
Disclosed are an apparatus and a method for normalizing an image of a driver's face in a predetermined size on the center of a monitor by automatically controlling a lens when the image of the driver's face is detected. The apparatus includes a lens for photographing a driver's face, a first motor for moving the lens in a forward or rearward direction in order to adjust a zoom parameter, a second motor for moving the lens in a horizontal or vertical direction in order to adjust a pan parameter or a tilt parameter, and a controller for extracting an initial face area from a photographed image and controlling operations of the first motor and the second motor according to the extracted initial face area.