Image Stabilization Control for Decentered Optical Systems
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Solution Overview
Problem
Existing image stabilization systems for optical systems using the central projection method fail to adequately address image blur differences between the central and peripheral parts of an image, leading to insufficient or excessive image stabilization when considering decentering of the image stabilizing optical system.
Innovation Solution
A control apparatus and method that calculates and adjusts the image stabilization driving amount based on both tilt-image shift sensitivity and decentering-image shift sensitivity for each image height, using a lens microcomputer and camera microcomputer to determine the optimal movement of the image stabilizing optical system, ensuring effective image stabilization at a predetermined image point position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image stabilization is performed considering only tilt-image shift sensitivity, then image stabilization at the central part of the image is improved, but image stabilization at the peripheral part and predetermined image point position becomes insufficient
Solution Approach 1:
The patent applies local quality by calculating different image stabilization amounts for different image point positions. Specifically, it computes a first image stabilization amount based on tilt-image shift sensitivity for the central part, and a second image stabilization amount based on decentering-image shift sensitivity for the peripheral part and predetermined image point position. This allows each region to receive optimized stabilization tailored to its specific characteristics, resolving the contradiction between central accuracy and peripheral coverage.
2Device complexity
If image stabilization amount is not calculated in consideration of decentering-image shift sensitivity, then device complexity is reduced, but image stabilization precision at predetermined image point position deteriorates
Solution Approach 1:
The patent segments the image stabilization control into two distinct calculation paths: one for the central part using tilt-image shift sensitivity, and another for the peripheral part and predetermined image point position using decentering-image shift sensitivity. This segmentation allows the system to maintain simplicity for central stabilization while adding precision for peripheral and specific point stabilization, effectively resolving the contradiction between device complexity and measurement precision.
3Measurement precision
If image stabilization is performed for image blur at predetermined image point position, then image stabilization at that position is improved, but image stabilization at other positions may become excessive or insufficient
Solution Approach 1:
The patent changes the control parameter from a single uniform image stabilization amount to position-dependent image stabilization amounts. By introducing decentering-image shift sensitivity as an additional parameter and calculating separate stabilization amounts for different image point positions, the system achieves precise stabilization at the predetermined position while maintaining balanced performance across the entire image, resolving the contradiction between localized precision and overall balance.
Data Source
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Figure 3A~3B
AI summary
A control apparatus includes a first acquisition unit configured to acquire information on image shift sensitivity relative to decentering of an image stabilizing optical system, the information being associated with an image point position of an image pickup optical system, the image pickup optical system including the image stabilizing optical system configured to perform image stabilization, and a second acquisition unit configured to acquire a first image stabilizing driving amount of the image stabilizing optical system during the image stabilization. The second acquisition unit is configured to acquire the first image stabilizing driving amount associated with a predetermined image point position by using the information on the image shift sensitivity associated with the predetermined image point position.