Lighting Control Apparatus for Surveillance Camera Zoom Adaptation
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Solution Overview
Problem
Surveillance cameras in varying light environments face challenges in maintaining image brightness and avoiding screen saturation and reflector non-identification due to inadequate lighting control, especially when optical zoom changes the angle of view.
Innovation Solution
A method and apparatus that control the zoom of a lighting unit based on the angle of view and optical zoom magnification, adjusting the diffusion range of light to ensure image brightness meets preset conditions, involving a controller, optical unit, and lighting lens to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lighting is used to illuminate the scene, then image brightness is improved, but screen saturation and reflector non-identification occur
Solution Approach 1:
The patent applies local quality by adjusting the diffusion range of light according to the angle of view. When the angle of view changes during optical zoom, the system modifies the lighting distribution locally to match the captured image's field of view, preventing both under-illumination and over-illumination (saturation) in different regions of the image
2Adaptability or versatility
If optical zoom is used to change angle of view, then surveillance coverage is improved, but image brightness becomes inconsistent
Solution Approach 1:
The system uses feedback by continuously monitoring the angle of view changes during optical zoom operations and adjusting the lighting unit's diffusion range accordingly. This closed-loop control ensures that image brightness remains consistent across different zoom levels by adapting the lighting to match the current field of view
3Device complexity
If lighting diffusion range is fixed, then device complexity is reduced, but image brightness cannot be maintained under varying angle of view
Solution Approach 1:
The patent implements dynamics by making the lighting diffusion range adjustable rather than fixed. The system dynamically changes the lighting distribution characteristics in response to angle of view variations during optical zoom, allowing the lighting unit to adapt to different surveillance scenarios without requiring multiple fixed lighting configurations
Data Source
AI summary
A method of controlling zoom of a lighting unit based on brightness of an image may include determining at least one of an angle of view of an optical unit and an optical zoom magnification of the optical unit configured to obtain an image by using an image sensor, determining a zoom adjustment range of a lighting unit based on at least one of the angle of view and the optical zoom magnification, and adjusting zoom of the lighting unit such that brightness of the image meets a preset condition within the zoom adjustment range, wherein a diffusion range of light from the lighting unit is adjusted through the zoom adjustment of the lighting unit.