Camera Module Watchdog Control for Laser Eye Exposure
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Solution Overview
Problem
The rapid development of face recognition technologies and structured light in consumer electronics poses a risk to human eyes due to harmful laser light emitted during face unlocking and face payment processes, as existing systems lack effective mechanisms to prevent prolonged exposure to laser light.
Innovation Solution
A control system for electronic devices that includes a first processing unit and a target processing unit, which monitor the operation of camera components like laser projectors and infrared cameras. If the target processing unit fails to write data within a preset time interval, the system resets or reboots the camera component to prevent prolonged laser emission, ensuring the safety of human eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If laser light is emitted for face recognition, then face unlocking and face payment functions are enabled, but human eyes are exposed to harmful laser light
Solution Approach 1:
The system uses structured light projection with periodic modulation patterns (multiple frames of different patterns) instead of continuous laser emission. The laser projector emits light in controlled periodic cycles with specific duty cycles, reducing continuous exposure while maintaining face recognition functionality through temporal sampling of reflected patterns.
Solution Approach 2:
The patent introduces an intermediary control mechanism (processor controlling laser duty cycle and projection timing) between the face recognition system and laser emitter. This intermediary manages the laser emission parameters dynamically, ensuring functional operation while limiting harmful exposure through controlled intermediate states of laser activation.
2Measurement precision
If laser projector operates continuously for face recognition, then recognition accuracy is maintained, but risk of eye damage increases
Solution Approach 1:
The system projects multiple frames of structured light patterns in periodic succession rather than continuous emission. Each frame uses different spatial patterns, and the periodic modulation allows accurate face mapping through temporal sampling while reducing cumulative laser exposure duration, maintaining recognition precision with reduced harm.
Solution Approach 2:
The system maintains continuous face recognition capability through rapid sequential projection of multiple structured light frames. The useful action (face mapping) continues without interruption in terms of functional output, while the actual laser emission is pulsed periodically, creating continuity of service with discontinuity of harmful exposure.
3Reliability
If monitoring system checks processing unit operation, then laser projector safety is improved, but system complexity increases
Solution Approach 1:
The system implements feedback control where the processor continuously monitors the operational status of the target processing unit controlling the laser projector. Based on this feedback (whether the processing unit is responding within expected time intervals), the system automatically adjusts laser emission or triggers safety protocols, improving reliability through closed-loop monitoring without requiring complex additional hardware.
Data Source
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AI summary
Embodiments of the present disclosure provide a system (30) for controlling a camera component (80), a camera component (80) is applicable for an electronic device (100), and the system (30) comprises a first processing unit (302) and a target processing unit (301). The target processing unit (301) is configured to control the camera component (80). The first processing unit (302) is configured to determine whether the target processing unit (301) writes data to the first processing unit (302) in accordance with a preset time interval, and when the target processing unit (302) does not write data to the first processing unit (32) over the preset time interval, change an operating state of the camera component (80) and/or control the electronic device (100) to restart.