Image Stabilization Crop Position Adjustment During Zooming
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Solution Overview
Problem
In lens interchangeable camera systems, electronic image stabilization causes unnatural motion during zooming due to discontinuous focal length updates, leading to conspicuous swing back processes in moving images.
Innovation Solution
An image stabilization apparatus that adjusts the crop position based on detected vibration, with a control unit increasing the swing back amount during zooming and dispersing focal length changes over time intervals to maintain continuous motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If focal length information is updated at predetermined time intervals through communication between lens and camera body, then communication load is reduced and system stability is improved, but during zooming operations the focal length updates become discontinuous causing swing back process to become conspicuous as unnatural movement in moving images
Solution Approach 1:
The determination unit detects zooming operations in advance by monitoring focal length changes, and the control unit prepares adjusted swing back amounts before the swing back process executes. This preliminary detection and preparation of correction parameters prevents the discontinuous updates from causing noticeable unnatural movement during zooming operations.
Solution Approach 2:
The control unit dynamically adjusts the swing back amount based on the determined zooming state. When zooming is detected, the control unit applies a different swing back amount compared to normal operation, making the image stabilization correction adaptive to the current operational condition and preventing conspicuous artifacts.
2Manufacturing precision
If electronic image stabilization crops images to correct vibration, then image blur is reduced, but the crop position deviates from center during panning and fails to return to center during subsequent zooming, creating unnatural motion
Solution Approach 1:
The control unit continuously monitors the crop position and detects when it has deviated from the center during panning operations. This feedback mechanism triggers adjusted swing back correction during subsequent zooming operations to bring the crop position back to center, eliminating the unnatural motion artifact while preserving the vibration correction benefit.
Data Source
AI summary
An image stabilization apparatus comprising: an image stabilization unit that performs image stabilization by changing a crop position at which part of image is cropped from an image obtained by photoelectric conversion of an optical image formed through a detachable lens unit by an image sensor based on a vibration amount detected by a vibration detection unit; a control unit that controls the image stabilization unit so as to shift the crop position by a predetermined swing back amount toward a center of the image; and a determination unit that determines whether or not zooming is performed based on focal lengths obtained from the lens unit at a predetermined time interval, wherein the control unit increases the swing back amount in a case where zooming is performed than in a case where zooming is not performed.