Image Stabilization Frequency Division for Reduced Load
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Solution Overview
Problem
Existing image stabilization techniques in image capture apparatuses face challenges in effectively stabilizing images during both moving and still image shooting without increasing calculation load and program volume, particularly in situations where both optical and electronic image stabilization are used, leading to inefficiencies and potential image disturbances.
Innovation Solution
An image capture apparatus is designed with a first image stabilization unit for optical correction, a second unit for electronic correction, and a shake detection unit that calculates stabilization amounts and divides them into separate frequency bands for optimal correction during still image exposure, allowing for improved image stabilization during moving image shooting without excessive computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If both optical image stabilization and electronic image stabilization are used to widen the correction range, then the image stabilization effect is enhanced, but the calculation load and program volume increase
Solution Approach 1:
The patent divides the image stabilization correction into two separate units: optical image stabilization (driving imaging lens) and electronic image stabilization (controlling image readout position). The division unit separates the first image stabilization amount into a second image stabilization amount for optical correction and a third image stabilization amount for electronic correction. This segmentation allows each unit to operate independently with optimized calculation loads while achieving comprehensive stabilization.
2Manufacturing precision
If optical image stabilization is used during still image exposure, then high-frequency image blur is corrected, but the correction range is limited and additional filters are required
Solution Approach 1:
The patent makes the image stabilization system universally applicable to both still image shooting and moving image shooting by combining optical and electronic stabilization units. The system can perform effective image stabilization during still image exposure without requiring additional frequency division filters, as the combination of optical and electronic units provides comprehensive correction capability across different shooting modes.
3Device complexity
If a boundary is set between electronic image stabilization and optical image stabilization, then the correction range is simplified, but image disturbance occurs at the boundary due to overshoot
Solution Approach 1:
The patent dynamically adjusts the distribution between optical and electronic image stabilization amounts based on the detected shake characteristics. Instead of using a fixed boundary, the system continuously optimizes the division of correction tasks between the two units, preventing overshoot and image disturbance at boundaries while maintaining simple control ranges.
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
The solution enhances image stabilization effects in both moving and still image shooting by optimizing the use of optical and electronic stabilization, reducing calculation load, and preventing image disturbances, thereby improving image quality and operational efficiency.
Implementation Method 1
a shake detection unit configured to detect a shake of the image capture apparatus to output a shake signal
Implementation Method 2
a first image stabilization unit configured to optically correct an image blur by driving part of the imaging optical system in a direction in which a blur of the object image is corrected
Implementation Method 3
a second image stabilization unit configured to electronically correct the image blur by controlling an image readout position of the image pickup device in the direction in which the blur of the object image is corrected
Data Source
AI summary
An image capture apparatus includes an image pickup device, a first image stabilization unit which optically corrects an image blur by driving part of the optical system, a second image stabilization unit which electronically corrects the image blur by controlling the image readout position of the image pickup device, a shake detection unit which detects a shake of the image capture apparatus, a correction amount calculation unit which calculates an image stabilization amount based on the detected shake signal, and a division unit which divides a first image stabilization amount of a predetermined frequency band into a second image stabilization amount for correcting the image blur by the first image stabilization unit and a third image stabilization amount for correcting the image blur by the second image stabilization unit.