Dynamic Correction Ratio Between OIS and IIS
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Solution Overview
Problem
Existing image stabilization methods, such as optical image-stabilization (OIS) and image-sensor shift type image stabilization (IIS), face issues with overshoot, delayed following of commands, and deteriorated image stabilization performance due to discontinuous changes in correction ratios and limitations in movable ranges.
Innovation Solution
A control apparatus and method that dynamically adjust the correction ratio between OIS and IIS based on the distance to the movable end of the OIS, increasing the proportion of IIS in the correction ratio as the distance decreases, to prevent overshoot and ensure smooth image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the correction ratio between OIS and IIS is changed discontinuously, then the correction amount can reach the movable range limit, but overshoot and delayed following occur causing deteriorated IS performance
Solution Approach 1:
The correction ratio between OIS and IIS is changed dynamically and continuously based on the current correction amount and remaining movable range, rather than discontinuously. This dynamic adjustment prevents overshoot and delayed following by smoothly transitioning the correction ratio as the correction lens approaches its movable range limit.
Solution Approach 2:
The system calculates the remaining movable range in advance and adjusts the correction ratio proactively before the correction lens reaches its limit. By predicting the approaching limit and pre-adjusting the correction ratio, the system prevents overshoot from occurring in the first place.
2Productivity
If the proportion of IIS in correction ratio is not increased to 100% when correction lens contacts movable end, then OIS can continue operating, but high-performance IS cannot be achieved
Solution Approach 1:
The correction ratio parameters are continuously adjusted based on the real-time correction amount and remaining movable range. When the correction lens approaches or reaches its movable end, the system changes the correction ratio parameters to increase IIS proportion, ensuring optimal IS performance under different operational conditions.
3Manufacturing precision
If correction ratio changes are made to reach movable range limit, then correction capacity is maximized, but shake and noise are generated deteriorating IS quality
Solution Approach 1:
The correction ratio is adjusted dynamically and continuously rather than in discrete steps. This smooth dynamic adjustment eliminates sudden changes that cause shake and noise, while still allowing the system to utilize the full movable range of the correction lens for maximum correction capacity.
Data Source
AI summary
A control apparatus configured to perform image stabilization using a first image stabilization unit and a second image stabilization unit includes a determining unit configured to determine a correction ratio between the first image stabilization unit and the second image stabilization unit. The determining unit determines the correction ratio between the first image stabilization unit and the second image stabilization unit such that a proportion of the second image stabilization unit in the correction ratio increases as a distance to a movable end of the first image stabilization unit decreases.