Image Stabilization Center Shift for Lens Alignment Errors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In interchangeable lens cameras, manufacturing errors can cause the image circle center to be displaced from the image sensor center, limiting the image stabilization shift amount and potentially changing the composition unintentionally during shooting states like tripod use or time-lapse photography.
Innovation Solution
An image stabilization apparatus and method that calculates and controls the image sensor shift to compensate for shake, with a determination unit assessing the shooting state to adjust the shift amount based on the image circle center position, ensuring minimal composition change during priority states such as tripod use or time-lapse shooting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image sensor is shifted to compensate for optical axis displacement, then image stabilization effectiveness is improved, but the shooting area and composition change unintentionally
Solution Approach 1:
The patent dynamically adjusts the image stabilization center position based on the relationship between the image circle center and image sensor center. When the displacement exceeds a threshold, the stabilization center is shifted to the image circle center to maximize stabilization effectiveness. When displacement is within tolerance, the stabilization center remains at the image sensor center to maintain composition stability. This dynamic adjustment resolves the contradiction by adapting the stabilization strategy to actual optical conditions.
Solution Approach 2:
The patent changes the parameter of image stabilization center position based on detected optical axis displacement. By calculating the displacement between image circle center and image sensor center, the system adjusts the stabilization center coordinates to optimize both stabilization performance and composition accuracy, resolving the trade-off between these two requirements.
2Manufacturing precision
If the image sensor center and image circle center are aligned, then manufacturing precision is improved, but the adaptability to different lenses is reduced
Solution Approach 1:
The patent performs preliminary detection of the image circle center position and calculates the optimal stabilization center before image stabilization is executed. This preliminary action allows the system to pre-adjust for optical axis displacement specific to each lens, enabling both precise alignment for the current lens and adaptability to future lens changes without requiring physical repositioning of the image sensor.
Solution Approach 2:
The patent uses feedback from image circle center detection to dynamically adjust the stabilization center position. By continuously monitoring the relationship between image circle center and image sensor center, the system adapts to different lenses and their manufacturing variations, maintaining both precision and versatility through real-time parameter adjustment based on actual optical conditions.
Data Source
AI summary
An image stabilization apparatus comprising a calculation unit that calculates a driving amount for moving an image sensor so as to compensate for shake, an image stabilization control unit that controls image stabilization by moving the image sensor based on the calculated driving amount, a determination unit that determines whether a current state is a first state according to an image shooting state, and a control unit that controls a shift amount of a center position of image stabilization control so as to be smaller in a case where a center position of the image circle of a lens apparatus is moved from a first position to a second position and the first state is determined than in a case where the center position is moved from the first position to the second position and the first state is not determined.