Image Capture Device Adaptive Light Intensity Control
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Solution Overview
Problem
Existing image capture devices, particularly those used in interactive audio and video systems, face the challenge of ensuring that the light source does not damage users' eyes within the maximum operation distance, as the luminance of the structure light required for increased depth map quality can still cause eye damage even if it does not exceed safety limits.
Innovation Solution
An image capture device equipped with a light source, image capture circuit, and processor that adjusts the intensity of the emitting light based on luminance values and a target value, using methods such as digital dimming or analog dimming to prevent eye damage by ensuring luminance levels are within safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light source emits stronger power to increase operation distance, then the operation distance is extended, but the luminance may damage user eyes within the maximum operation distance
Solution Approach 1:
The patent implements dynamic adjustment of light source intensity based on real-time detection of user position and distance. The processor continuously monitors the operation distance and adjusts the driving current to the light source accordingly, transitioning from static fixed-intensity emission to dynamic adaptive intensity control, thereby extending safe operation distance while preventing eye damage
Solution Approach 2:
The system employs feedback mechanisms where the image capture circuit detects user position and distance, feeds this information to the processor, which then adjusts the light source intensity in response. This closed-loop feedback control ensures that the luminance remains within safe limits while maximizing operation distance based on actual user conditions
2Object-affected harmful factors
If the luminance is reduced to prevent eye damage, then eye safety is improved, but the operation distance decreases
Solution Approach 1:
The patent changes the intensity parameter of the light source dynamically based on detected user distance. When users are farther away, the system increases luminance parameters to maintain effective operation distance; when users approach, it reduces luminance to prevent eye damage. This parameter adaptation resolves the contradiction between eye safety and operation distance
Solution Approach 2:
The system transitions from static luminance settings to dynamic intensity adjustment, where the light source adapts its output in real-time based on user position. This dynamic behavior allows the system to maintain safe luminance levels while preserving adequate operation distance through continuous adaptation
3Manufacturing precision
If the light source intensity is increased to improve depth map quality, then depth map quality is improved, but the luminance may exceed safe limits for user eyes
Solution Approach 1:
The patent applies different intensity levels to different spatial regions and user distances. Rather than using uniform high intensity throughout, the system provides localized appropriate intensity - higher when users are distant (maintaining depth map quality) and lower when users are close (ensuring eye safety). This spatially differentiated quality approach resolves the contradiction
Solution Approach 2:
The system dynamically changes the intensity parameter of the light source based on real-time user detection data. By adjusting the driving current and thus the luminance parameter in response to user position, the system maintains sufficient intensity for quality depth mapping while preventing excessive luminance that would harm user eyes
Data Source
AI summary
An image capture device includes a light source, an image capture circuit, and a processor. The light source is used for generating emitting light. The image capture circuit is used for capturing an image corresponding to the emitting light. The processor is coupled to the light source and the image capture circuit for optionally adjusting the intensity of the emitting light of the light source according to luminance corresponding to the image and a target value.