Image Sensor Shake Correction for Mechanical Shutter Vibration
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Solution Overview
Problem
Existing imaging apparatuses struggle to effectively suppress image shake caused by mechanical shutter vibrations and user discomfort, particularly at varying shutter speeds.
Innovation Solution
The imaging apparatus employs a mechanical shutter with a processor that performs movement control of the image sensor to correct image shake and gain-up control at specific shutter speeds, along with low-pass filter processing and phase difference in drive signals for actuators to enhance stability and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If gain-up control is applied to suppress image shake at short shutter speeds, then image stability improves, but user discomfort increases due to excessive sensor movement
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gain of movement control based on shutter speed. Specifically, gain-up control is applied only when shutter speed is shorter than a first default time and longer than a second default time, creating a threshold-based parameter adjustment strategy that optimizes image stability while avoiding excessive correction at extreme shutter speeds
Solution Approach 2:
The patent implements dynamics by making the movement control gain adjustable and adaptive rather than fixed. The gain value changes dynamically according to the shutter speed setting, allowing the system to optimize performance across different operating conditions without causing user discomfort at extreme settings
2Manufacturing precision
If movement control is applied to correct image shake, then image quality improves, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent uses parameter changes to control the gain of movement control based on shutter speed. By adjusting the gain parameter dynamically, the system achieves improved image quality without adding complex hardware, relying instead on intelligent parameter adjustment within the existing control framework
Solution Approach 2:
The patent implements feedback control by continuously monitoring shutter speed and adjusting movement control gain accordingly. The system feeds back the shutter speed information to the gain control unit, which automatically adjusts the movement control parameters to maintain optimal image quality across different shooting conditions
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 suppresses image shake and user discomfort by optimizing sensor movement and gain control based on shutter speed, improving image stability and quality across different shutter settings.
Implementation Method 1
perform, based on vibration of the imaging apparatus, movement control of moving the image sensor in a direction in which shake of an image is corrected
Implementation Method 2
perform gain-up control of increasing a gain of the movement control in a case where a shutter speed of the mechanical shutter is shorter than a first default time
Implementation Method 3
perform low-pass filter processing on a signal obtained in accordance with the vibration of the imaging apparatus at a default cutoff frequency
Data Source
AI summary
A processor of an imaging apparatus is configured to: perform, based on vibration of the imaging apparatus, movement control of moving the image sensor in a direction in which shake of an image, which is obtained by imaging performed by the image sensor, is corrected; and perform, in the imaging performed by the image sensor, gain-up control of increasing a gain of the movement control in a case where a shutter speed of the mechanical shutter is shorter than a first default time compared to a case where the shutter speed of the mechanical shutter is longer than the first default time.