Dynamic Lens Shading Correction for Optical Image Stabilization
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Solution Overview
Problem
Lens shading correction methods are inadequate when optical image stabilization changes the chief ray angle, leading to visible flaws in images due to varying optical paths through the lens, as they are typically designed for a specific scenario and do not account for shifts or tilts caused by stabilization.
Innovation Solution
An optical image stabilization system that acquires system change information affecting the optical path during image capture and adjusts the lens shading correction function accordingly, using this information to apply the corrected function to image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If optical image stabilization is used to counteract handshake during image capture, then image stability is improved, but lens shading correction becomes inadequate due to changes in chief ray angle, causing visible flaws in the image
Solution Approach 1:
The lens shading correction function is made dynamic by adjusting it based on the actual optical path changes caused by OIS. Instead of using a fixed correction function designed for a specific scenario, the system dynamically adapts the correction function to match the actual chief ray angle changes during capture, thereby maintaining correction accuracy despite OIS-induced optical path variations
Solution Approach 2:
The system uses feedback from the OIS operation data (system change information) to adjust the lens shading correction function. By monitoring how the optical path changes during stabilization and using this information to modify the correction function accordingly, the system compensates for the adverse effects of OIS on shading correction accuracy
2Productivity
If a fixed lens shading correction function is used, then correction is simple and fast, but it fails to account for optical path changes during OIS, resulting in visible image flaws
Solution Approach 1:
The system performs preliminary acquisition of system change information related to optical path changes before applying the corrected lens shading function. By preparing and storing the OIS-related data in advance, the system can quickly adjust the correction function during image capture without significant processing delays, thus maintaining both speed and accuracy
Data Source
AI summary
A method including using an optical image stabilization function in an imaging apparatus comprising a lens and an image sensor; acquiring system change information, the system change information concerning changes that affect optical path through the lens to the image sensor during capturing of an image through the lens; adjusting a lens shading correction function on the basis of the acquired system change information; and applying the adjusted lens shading correction function to image data representing the captured image.