Lateral Chromatic Aberration Correction via Lens Position Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Correcting lateral chromatic aberration in auto-focus cameras is difficult and expensive due to the dynamic change of lens position with focus distance, especially as image sensor resolution increases and pixel size decreases.
Innovation Solution
A method and device that construct a relationship model between lens position and lateral chromatic aberration magnitude using preset parameters, store this model as calibration data, and correct the aberration by acquiring system parameters and pre-stored data, involving image processing steps like target image capture, mass center calculation, outlier removal, and data conversion to a 2D grid for accurate aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hardware correction methods are used for LCA in auto-focus cameras, then correction effectiveness is improved, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent replaces complex hardware correction mechanisms with a software-based calibration method. By constructing a relationship model between lens position and LCA magnitude through image processing and storing it as calibration data, the system achieves LCA correction without additional optical elements or mechanical adjustment mechanisms, thereby reducing device complexity while maintaining correction effectiveness
Solution Approach 2:
The patent changes the approach from physical hardware modification to parameter-based correction. By measuring LCA magnitude at different lens positions and storing these parameters as calibration data, the system dynamically adjusts correction based on lens position parameters rather than requiring physical hardware changes, resolving the contradiction between correction effectiveness and hardware complexity
2Measurement precision
If traditional calibration methods are used for each lens position, then calibration accuracy is improved, but calibration time and processing complexity increase
Solution Approach 1:
The patent performs preliminary calibration by capturing images at multiple preset lens positions and constructing the relationship model between lens position and LCA magnitude in advance. This pre-calibration approach stores the correction data for rapid retrieval during actual operation, achieving high calibration accuracy without requiring time-consuming real-time calibration for each lens position
Solution Approach 2:
The patent segments the calibration process into discrete preset lens positions. By dividing the continuous lens movement range into specific measurement points and calibrating at each segment, the system achieves comprehensive coverage and high accuracy while keeping the calibration process manageable and efficient, avoiding the need for continuous real-time calibration
Data Source
AI summary
Provided is a method and a device for correcting lateral chromatic aberration, a storage medium and a computer equipment. In the method, a relationship model between lens position and magnitude of LCA is constructed based on preset parameters of lens positions, and the relationship model is stored as calibration data; system parameters of a camera to be corrected and pre-stored calibration data are obtained; the LCA of the camera to be corrected is obtained by calculating the system parameters; and the LCA is corrected by the calibration data. With the method, the LCA of the lens can be removed when the focus distance is changed, and the method is suitable for mass-production.