Image Stabilization Lens Range Adjustment for Macro Shading
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Solution Overview
Problem
Existing image capturing apparatuses face challenges in providing effective image stabilization, especially during macro imaging, as they fail to adequately correct for parallel vibrations and shading issues, leading to image deterioration and inefficient power consumption.
Innovation Solution
An image capturing apparatus with a calculation unit to determine the correction amount for vibrations and a setting unit that adjusts the range of movement of the correction unit based on object distance, ensuring a larger range of movement as the object distance increases, thereby enhancing image stabilization while minimizing shading effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the range of movement of the correction unit is increased to improve image stabilization for macro imaging, then parallel vibration correction is enhanced, but shading in the marginal area worsens
Solution Approach 1:
The patent applies dynamics by making the range of movement of the correction unit variable rather than fixed. The control unit dynamically adjusts the range of movement based on detection results - expanding it when parallel vibration is detected during macro imaging, and restricting it when angular vibration predominates or during wide-angle imaging. This dynamic adjustment resolves the contradiction by allowing the system to optimize between stabilization performance and shading prevention according to actual imaging conditions.
2Reliability
If image blur correction is performed continuously to maintain image quality, then image stabilization is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by continuously monitoring vibration conditions through the vibration detection unit and periodically adjusting the correction unit's operation. The system detects current vibration characteristics and periodically modifies the range of movement accordingly, rather than maintaining a fixed operational state. This allows the system to consume power only when necessary for effective stabilization, resolving the contradiction between continuous correction and power efficiency.
3Object-affected harmful factors
If the range of movement is restricted to prevent shading, then image quality is maintained, but image stabilization effectiveness decreases
Solution Approach 1:
The patent applies parameter changes by modifying the operational parameters of the correction unit based on detected vibration characteristics. Specifically, the control unit changes the range of movement parameter according to the type and magnitude of detected vibration. When parallel vibration is detected during macro imaging, the range is expanded beyond normal limits; when angular vibration is detected or during wide-angle imaging, the range is restricted. This parameter adaptation resolves the contradiction by optimizing the range of movement for each specific imaging scenario.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively stabilizes images by adjusting the range of movement of the correcting lens in accordance with object distance, preventing significant image quality degradation due to shading and maintaining optimal image stabilization performance across varying distances.
Implementation Method 1
the image blur correction apparatus uses an angular velocity meter and an accelerometer to detect the vibration
Implementation Method 2
the image blur correction apparatus uses an angular velocity meter and an accelerometer to detect the vibration
Implementation Method 3
the image blur correction apparatus outputs the correction position control signal corresponding to the movable member position signal, whereby feedback control is achieved
Data Source
AI summary
A range of movement of a correction unit is set based on an object distance value. According to various embodiments, the range of movement of the correction unit is set to be larger as the object distance increases. According to one embodiment, a setting unit sets the range of movement of the correction unit to be larger as the object distance increases in a range where an object distance is larger than a first threshold and is equal to or smaller than a second threshold, and the setting unit fixes the range of movement of the correction unit to be a first range of movement where the object distance is equal to or smaller than the first threshold, and to be a second range of movement where the object distance is larger than the second threshold.