Correction Lens Group Positioning for Trimmed Image Quality
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Solution Overview
Problem
High-resolution camera systems face challenges in maintaining consistent optical performance across the entire image, particularly when trimming or electronically zooming, as the optical performance is often higher at the center and lower at the periphery, leading to potential image quality degradation in specific areas.
Innovation Solution
A lens system and camera system that include a movable lens group and a correction lens group, where the correction lens group's position is adjusted based on data tables correlating lens positions with optical performance, to enhance the image quality of specific image areas by driving the correction lens group to optimal positions for improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If trimming or electronic zoom is performed to use a specific area of the image, then the image quality of that area may be improved for the intended purpose, but the optical performance of the selected area is lower than the optical performance of other areas of the image
Solution Approach 1:
The patent applies local quality by adjusting the correction lens group position specifically for the selected image area (center or peripheral) to optimize optical performance locally. The system determines whether the selected area is central or peripheral and applies different correction lens positions accordingly, ensuring high optical quality in the specific region of interest rather than uniformly across the entire image.
2Manufacturing precision
If a correction lens group is added to adjust optical performance of specific image areas, then image quality of trimmed or zoomed areas can be improved, but the device complexity increases
Solution Approach 1:
The correction lens group serves multiple functions: it corrects optical performance for both central and peripheral image areas, and can be adjusted based on different operating conditions (full image mode, trimming mode, electronic zoom mode). This multi-functionality allows a single correction mechanism to handle various image quality optimization scenarios without requiring separate systems for each mode.
Solution Approach 2:
The correction lens group position is dynamically adjusted based on real-time operating conditions. The control section determines the selected image area and automatically positions the correction lens group appropriately (first correction position for central areas, second correction position for peripheral areas), making the system adaptive rather than static.
3Manufacturing precision
If assembly errors are minimized through precise adjustment, then high-image quality can be achieved, but the system becomes more sensitive to changes in optical system conditions such as movable lens group position
Solution Approach 1:
The system incorporates feedback by continuously monitoring the movable lens group position and the selected image area, then automatically adjusting the correction lens group position accordingly. This closed-loop control compensates for changes in optical conditions and maintains image quality stability despite variations in lens positions or assembly tolerances.
Data Source
AI summary
A lens system for a camera, includes: an image formation optical system including a movable lens group and a correction lens group; a drive section driving the correction lens group; a lens position acquisition section acquiring a lens position of the movable lens group; a specification section specifying a partial image of a part of region in an image; a storage section storing a data table; and a control section, in accordance with the lens position of the movable lens group acquired by the lens position acquisition section, on the basis of the data table, acquiring a position for the correction lens group that improves optical performance of the partial image specified by the specification section and then controlling the drive section such as to move the correction lens group to the acquired position.