Automatic Light Adjusting Method for Camera Illumination Control
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Solution Overview
Problem
Conventional all-weather environmental monitoring systems fail to adjust light intensity of multiple light sources around a camera effectively, leading to inferior image quality due to over-bright or over-dark scenes.
Innovation Solution
An automatic light adjusting method that uses a camera with multiple lighting units and an operational processor to capture images, compute light intensity across regions, and set a lighting limitation ratio to optimize light distribution, adjusting exposure duration and intensity to maintain light within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If synchronous light intensity adjustment is applied to multiple light sources, then the control complexity is reduced, but the image quality deteriorates due to over-bright or over-dark scenes
Solution Approach 1:
The patent divides the image into multiple regions (first region, second region, third region) corresponding to different light source illumination areas. Each region's light intensity is independently calculated and adjusted, allowing precise control over each light source's contribution to the final image, thereby preventing over-bright or over-dark scenes while maintaining manageable control complexity.
Solution Approach 2:
The patent implements local quality adjustment by computing light intensity ratios for each region separately and applying region-specific lighting limitation ratios. This allows different parts of the image to have optimized lighting conditions according to their specific requirements, improving overall image quality without requiring complex global control mechanisms.
2Manufacturing precision
If light intensity of each light source is adjusted independently according to region, then the image quality is improved, but the computational complexity increases
Solution Approach 1:
The patent captures a preliminary image with all light sources at maximum intensity to establish baseline light intensity values for each region. This preliminary action provides reference data that simplifies subsequent calculations, as the system only needs to compute adjustment ratios relative to this baseline rather than performing full optimization calculations from scratch.
Solution Approach 2:
The patent implements a feedback mechanism where the captured image is analyzed to compute light intensity ratios, which then feed into the calculation of lighting limitation ratios. This feedback loop allows the system to automatically adjust each light source's intensity based on actual measured values, improving image quality while keeping computational complexity manageable through iterative refinement.
Data Source
AI summary
An automatic light adjusting method applied to a camera having at least one image capturing unit and a plurality of lighting units includes driving the plurality of lighting units to output maximal illumination, driving the at least one image capturing unit to acquire a first image by a first exposure duration, calculating a plurality of first light intensity of a plurality of regions on the first image, comparing the plurality of first light intensity with a predetermined range, and determining whether to set a first ratio about the plurality of first light intensity as a lighting limitation ratio of the plurality of lighting units according to a comparison result.