Rotatable Shade Plate for Dome Camera Aberration Control
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Solution Overview
Problem
Dome-type cameras face issues with image quality due to aberrations caused by the dome cover's lens effect, leading to overlapping and deterioration of images, especially at wide tilt angles, where the partial shade filter's current reciprocating mechanism is insufficient in controlling shading rates to achieve optimal image capture.
Innovation Solution
A camera apparatus with a rotatable camera unit and a shade plate system that adjusts its position based on stored posture information, allowing for precise control of the camera's direction and shade plate positioning to prevent overlapping and ensure suitable image brightness, using a control unit and memory to associate imaging directions with shade plate positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the lens unit is offset from the center of the dome cover to prevent vignetting at wide tilt angles, then image coverage is improved, but aberration occurs due to the lens effect of the dome cover causing overlapping images and deteriorated image quality
Solution Approach 1:
A shade plate is introduced as an intermediary element between the dome cover and the image pickup device. The shade plate selectively blocks specific light rays that would otherwise cause overlapping images, while allowing other necessary light to pass through to the lens unit and image sensor, thus resolving the contradiction between coverage and image quality
Solution Approach 2:
The shade plate is designed with specific geometric shapes and positions to provide localized shading in specific regions of the optical path. Rather than uniformly blocking light, the shade plate applies selective shading only where needed to prevent overlapping images, maintaining image quality in critical areas while preserving overall coverage
2Manufacturing precision
If a partial shade filter is used to prevent overlapping images, then image quality is improved, but the fixed reciprocating mechanism cannot dynamically adjust shading rates to achieve optimal image capture in different monitoring directions
Solution Approach 1:
The shade plate mechanism is transformed from a static or simple reciprocating structure to a dynamic system with multiple rotatable shade plates. Each shade plate can be independently rotated to different angular positions, enabling continuous adjustment of shading rates to adapt to various monitoring directions and imaging conditions, thus resolving the contradiction between image quality and adaptability
Solution Approach 2:
The shading function is divided into multiple independent rotatable shade plates rather than using a single fixed filter. This segmentation allows each shade plate to be controlled independently, providing fine-grained adjustment capability for different regions of the optical path and enabling versatile shading rate control for various monitoring scenarios
3Adaptability or versatility
If the camera unit is rotated to capture images in different directions, then monitoring ability is improved, but aberration and overlapping images occur at wide tilt angles due to the dome cover's lens effect
Solution Approach 1:
The rotatable shade plate acts as a dynamic intermediary that compensates for the optical aberrations introduced by the dome cover at wide tilt angles. By rotating the shade plate to appropriate positions corresponding to different camera directions, the system maintains high image quality across all monitoring directions, resolving the contradiction between adaptability and image quality
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 improves image quality by dynamically adjusting the shading rate, preventing overlapping and ensuring optimal image capture across various monitoring directions, enhancing the monitoring ability of the camera apparatus.
Implementation Method 1
aberration occurs due to a lens effect of the dome cover 101
Implementation Method 2
the partial shade filter 104 reciprocates between an insertion position and a retreat position and blocks one side of light incident on an image pickup device
Data Source
AI summary
A camera apparatus includes: a cover that has transparency; a rotatable camera unit that is provided inside the cover; a shade plate portion that includes a shade plate capable of partially shading light incident on the camera unit, wherein a position of the shade plate is rotatable; a control unit that is configured to control rotation of the camera unit and the position of the shade plate; and a memory that stores posture information including an imaging direction of the camera unit and positional information on the shade plate in association with each other. The control unit controls a direction of the camera unit based on the posture information stored in the memory and controls the position of the shade plate based on the positional information on the shade plate stored in the memory.