Camera Module Laser Power Control for Eye Safety
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Solution Overview
Problem
Laser projectors used in camera modules can emit high-powered laser light that poses a risk of damage to users, particularly when the projection distance is short, leading to potential eye harm due to excessive intensity.
Innovation Solution
A control method and device that determine a control parameter based on the projection distance between a target user and the camera module, adjusting the laser projector's power to prevent harm by emitting laser light with corresponding projection power, taking into account factors like facial image analysis, feature ratios, and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-powered laser light is emitted by the laser projector, then the projection quality and visibility are improved, but the risk of eye damage increases
Solution Approach 1:
The patent applies dynamics by making the laser projector's power adjustable based on real-time distance detection. The system dynamically changes the laser power level according to the detected distance between the projector and the user, transitioning from a static high-power state to a dynamic adaptive state that balances visibility and safety
Solution Approach 2:
The system implements feedback by using the imaging device to continuously detect the distance between the laser projector and the target object, then feeding this distance information back to the controller which adjusts the laser power accordingly. This closed-loop feedback mechanism ensures the laser intensity remains within safe boundaries while maintaining projection quality
Solution Approach 3:
The patent changes the power parameter of the laser projector based on distance measurements. When the detected distance is greater than a threshold, the system switches to high-power mode for better visibility; when the distance is less than or equal to the threshold, it switches to low-power mode to prevent eye damage, thus dynamically adjusting the laser parameter
2Length of stationary object
If the projection power is increased to improve visibility, then the projection distance can be extended, but the harmful effect on users increases
Solution Approach 1:
The system dynamically adjusts the laser power based on real-time distance detection. When the target is far away, high power is used to extend the effective projection distance; when the target approaches, the power is reduced automatically, thus dynamically managing both projection range and safety
Solution Approach 2:
The system takes preliminary anti-action by detecting the distance before emitting high-powered laser light. The imaging device continuously monitors the distance, and the controller preemptively adjusts the power level to prevent harmful intensity from reaching close objects, rather than reacting after damage occurs
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
Effectively reduces the risk of eye damage by dynamically adjusting the laser power according to the projection distance and user-specific parameters, ensuring safe operation of camera modules.
Implementation Method 1
A laser projector may emit laser light with preset pattern information and may project the laser light onto a target user in space. A laser light pattern reflected by the target user may be acquired by an imaging device
Data Source
AI summary
The present disclosure provides a control method of a camera module, a control device, a terminal, a nonvolatile computer readable storage medium and a computer device. The control method includes: obtaining a projection distance between a target user and the camera module; determining a control parameter of the camera module according to the projection distance and controlling the camera module based on the control parameter.