Camera Shake Correction Lens Movable Range Control
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Solution Overview
Problem
Image stabilization systems in cameras face challenges in correcting camera shake, especially during macro imaging, where translational shake is significant, and power consumption is high, while also dealing with shading issues caused by marginal illumination variations due to lens movement and focus adjustments.
Innovation Solution
An image processing apparatus that dynamically sets a movable range for the correction lens based on the focal length, subject distance, and imaging mode, prioritizing shake correction and minimizing power consumption by adjusting the correction range according to whether macro or normal imaging is being performed, thereby optimizing image quality and stabilization effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the movable range of the correction lens is increased to improve image stabilization effectiveness, then camera shake correction capability is improved, but shading occurs due to marginal illumination variations
Solution Approach 1:
The patent dynamically adjusts the movable range of the correction lens based on imaging conditions (macro vs. normal imaging). During macro imaging, a narrower movable range is set to prevent shading, while during normal imaging, a wider movable range is allowed for better stabilization. This dynamic adjustment resolves the contradiction by adapting the correction lens movement limits to the specific imaging scenario.
2Reliability
If image stabilization is continuously activated to maintain image quality, then image blur correction is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic assessment of imaging conditions (macro vs. normal) to determine when image stabilization should be actively applied. By evaluating whether macro imaging is being performed and adjusting the movable range accordingly, the system activates stabilization only when necessary, reducing power consumption while maintaining image quality when needed.
3Object-affected harmful factors
If the movable range is narrowed during macro imaging to prevent shading, then shading is reduced, but image stabilization effectiveness decreases
Solution Approach 1:
The patent applies different movable range settings for different imaging conditions: a narrower range for macro imaging to prevent shading, and a wider range for normal imaging for better stabilization. This local quality approach tailors the correction lens characteristics to the specific imaging scenario, optimizing both shading prevention and stabilization effectiveness for each condition.
4Reliability
If the movable range is widened for normal imaging to improve stabilization, then image stabilization effectiveness is improved, but power consumption increases
Solution Approach 1:
The patent changes the movable range parameter based on imaging conditions. During normal imaging, a wider movable range is set to improve stabilization effectiveness, while during macro imaging, the range is narrowed. This parameter change strategy allows the system to optimize stabilization performance when needed while conserving power during macro imaging where shading prevention is prioritized.
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 prevents significant image quality deterioration from shading and ensures efficient image stabilization, particularly in macro imaging scenarios, while reducing power consumption by tailoring the correction range to the specific imaging conditions.
Implementation Method 1
an angular velocity meter and an accelerometer are used when detecting camera shake in the image stabilization apparatus
Implementation Method 2
An accelerometer is often used to detect this translational shake
Data Source
AI summary
An image processing apparatus comprising: a first obtaining unit configured to obtain a focal length of an imaging optical system; a second obtaining unit configured to obtain a distance to a subject; a setting unit configured to set a movable range for a correction unit configured to correct camera shake, based on the focal length and the distance to a subject; and a calculation unit configured to calculate a correction amount for correcting the camera shake within the movable range that was set by the setting unit, based on a camera shake signal from a camera shake detection unit configured to detect camera shake and output the camera shake signal.