Dynamic Optical Electronic Shake Correction Distribution
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Solution Overview
Problem
Image quality degrades with electronic shake correction, especially at higher zoom magnifications, and existing methods struggle to correct image shake within exposure time, limiting the correctable range of image shake.
Innovation Solution
An image pickup apparatus with a controller that dynamically distributes the shake angle between optical and electronic shake correction based on zoom magnification and exposure time, ensuring equal ratios between the correctable ranges of both systems to maximize their combined effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic shake correction is used to extend the correctable range, then the correctable range of image shake is extended, but image quality degrades
Solution Approach 1:
The shake correction function is segmented into two independent systems: optical shake correction (using moving lens groups to physically shift the optical axis) and electronic shake correction (using image processing to shift the captured image). Each system operates independently with its own correction mechanism, allowing the patent to distribute the correction burden between them based on zoom magnification levels.
Solution Approach 2:
Different correction methods are applied to different zoom magnification ranges. At wide-angle (low zoom) positions, electronic shake correction is prioritized to extend the correctable range. At telephoto (high zoom) positions, optical shake correction is prioritized to maintain image quality. This local differentiation resolves the contradiction by applying the appropriate correction type to each operational context.
2Adaptability or versatility
If the ratio of electronic shake correction is increased at higher zoom magnification, then the correctable range is extended, but image quality degrades further
Solution Approach 1:
The distribution ratio between optical and electronic shake correction is made dynamic rather than fixed. The controller automatically adjusts the correction ratio based on the current zoom magnification level. At high zoom magnification, the system dynamically increases the proportion of optical shake correction to maintain image quality, while at wide-angle positions, it dynamically increases electronic shake correction to extend the correctable range.
3Manufacturing precision
If optical shake correction is used to maintain image quality, then image quality is preserved, but the correctable range is limited
Solution Approach 1:
The patent merges two shake correction systems (optical and electronic) into a unified hybrid correction system. The optical shake correction unit (using moving lens groups) and the electronic shake correction unit (using image processing) work together in coordination. The controller distributes the shake correction demand between both systems, allowing the combination to achieve a correctable range larger than either system alone while maintaining image quality through optimized distribution.
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 extends the correctable range of image shake while maintaining image quality by optimally utilizing both optical and electronic shake correction systems, even at high zoom magnifications and short exposure times.
Implementation Method 1
an image pickup element configured to generate an electric signal by photoelectrically converting incident light that enters the image pickup apparatus from a subject
Data Source
AI summary
A system controller sets an optical correction ratio, which is a distribution ratio in which a shake angle detected by a gyro sensor is distributed to optical shake correction, in accordance with an optical zoom magnification and controls a prism driver to correct the shake angle multiplied by the optical correction ratio by the optical shake correction, and also controls a read controller to correct the rest of the angle by electronic shake correction.