Dome Camera Filter Insertion Mechanism for Aberration Control
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Solution Overview
Problem
Conventional dome cameras face a tradeoff between securing a wide field of view and reducing image quality deterioration when capturing images at large tilt angles, due to vignetting and lens aberrations caused by offsetting the camera lens from the dome cover's center.
Innovation Solution
Incorporating a polarizing filter or partially darkening filter on the optical axis of the camera lens, which is inserted when the tilt angle exceeds a threshold, to prevent image quality deterioration and maintain a wide field of view, and using a filter insertion mechanism that blocks light in areas with low molding precision to suppress image quality issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the camera lens is offset from the center of the dome cover in the zenith direction, then vignetting is reduced and wide field of view is secured, but lens aberration occurs and image quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the filter insertion state changeable based on tilt angle. The filter is inserted when the tilt angle exceeds a threshold and removed when it is below the threshold, allowing the system to dynamically adapt to different operating conditions and resolve the contradiction between wide field of view and image quality
Solution Approach 2:
The patent changes the parameter of filter insertion/removal based on the tilt angle parameter. When the tilt angle exceeds a predetermined threshold, the filter is inserted to correct aberration; when it is below the threshold, the filter is removed to maintain wide field of view. This parameter-based control resolves the technical contradiction
2Manufacturing precision
If a polarizing filter or partially darkening filter is inserted on the optical axis, then image quality deterioration is reduced, but device complexity increases
Solution Approach 1:
The patent merges the filter insertion mechanism with the existing tilt mechanism. The filter insertion is controlled based on the tilt angle, and the filter insertion means is integrated into the existing dome camera structure, reducing the overall device complexity while still providing image quality correction
Solution Approach 2:
The system uses the tilt angle information from the existing tilt mechanism to control filter insertion automatically. The control unit determines whether to insert the filter based on the tilt angle threshold, making the system self-regulating without requiring additional complex control mechanisms
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
The solution effectively prevents image quality deterioration while maintaining a wide field of view during large tilt angle captures, by inserting filters strategically based on tilt and zoom factors, and reduces manufacturing costs through integration with existing mechanisms.
Implementation Method 1
filter insertion means for inserting a polarizing filter or a partially darkening filter
Implementation Method 2
partially darkening filter
Data Source
AI summary
A camera includes a cover, a camera lens provided behind the cover, and a shield configured to block at least a portion of light entering the camera lens through the cover, wherein the shield is movable from a retracted position at which the shield does not block the at least a portion of light entering the camera lens through the cover, to an inserted position at which the shield position blocks the at least a portion of a field of view of the camera lens and is positioned between the cover and the camera lens.