Structured Light Demodulation for Ambient Light Suppression
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Solution Overview
Problem
Existing skin measurement systems struggle with ambient light interference in uncontrolled environments, leading to inaccurate skin analysis and potential privacy concerns due to non-discriminatory imaging.
Innovation Solution
A system comprising an image projection unit that projects a time-varying spatially modulated pattern, an imaging unit to capture multiple images, and a processing unit to demodulate these images, selectively suppressing ambient light and generating an ambient light-suppressed image based on a target section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional display devices are used in bright ambient light conditions, then the display remains visible, but the contrast ratio deteriorates and viewing quality deteriorates
Solution Approach 1:
The backlight is divided into multiple independently controllable light emitting regions (first, second, third light emitting regions) that can be selectively dimmed or turned off based on ambient light conditions and content requirements, allowing selective suppression of ambient light interference while maintaining necessary visibility
Solution Approach 2:
The display device dynamically adjusts the luminance parameters of different backlight regions based on detected ambient light intensity, changing the brightness parameters of light emitting regions to optimize contrast ratio and viewing quality under varying ambient light conditions
2Illumination intensity
If the entire backlight is dimmed to suppress ambient light, then ambient light suppression improves, but visibility of important content deteriorates
Solution Approach 1:
Different regions of the backlight are assigned different luminance characteristics - some regions are dimmed or turned off to suppress ambient light, while other regions maintain or increase brightness to ensure important content remains visible, creating local quality variations across the display
Solution Approach 2:
The backlight is segmented into multiple independently controllable regions that can be selectively adjusted, allowing the system to suppress ambient light in certain areas while maintaining visibility of important content in other areas through independent luminance control
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 suppresses ambient light interference, enhances skin analysis accuracy, and maintains user privacy by selectively projecting and demodulating images to exclude background elements.
Implementation Method 1
determining ambient light conditions using an ambient light sensor
Implementation Method 2
controlling luminance of light emitting regions in the backlight
Data Source
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AI summary
According to an aspect, there is provided a system (200) comprising: an image projection unit (210) configured to project an illumination pattern onto at least a portion of a scene, an imaging unit (220) configured to capture a plurality of images of the scene while the illumination pattern is projected onto the scene, and a processing unit (230) configured to: demodulate the plurality of images based on the illumination pattern and with respect to a target section in the plurality of captured images, wherein the target section corresponds to one of: a portion of the scene on which the illumination pattern is selectively projected while the plurality of images were captured, a portion of the scene at which the projected illumination pattern is resolvable, a portion of the scene with pixel depth values which satisfy a predetermined range; and generate an ambient light supressed image of the scene based on results of the demodulation.