Interchangeable Lens Magnification Correction for Moving Image Stability
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Solution Overview
Problem
Existing camera systems with interchangeable lenses face challenges in maintaining consistent image quality due to angle-of-view variations caused by focus lens position changes, particularly during moving image capture, as conventional techniques either fail to address interchangeable lens systems or limit focus lens drive speed, leading to degradation in moving image quality.
Innovation Solution
An imaging apparatus and lens apparatus system that includes a sensor, generation unit, control unit, and correction unit to correct image magnification based on focal length variations, allowing for precise communication and calculation of correction information to stabilize image quality across different lens positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focus lens position is changed to adjust focus, then the focus accuracy is improved, but the angle of view varies causing degradation in moving image quality
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the image magnification parameter based on the actual focal length variation. The correction unit calculates the required magnification correction from the focal length variation amount and applies it to the captured image, thereby compensating for the angle-of-view variation caused by focus lens movement while maintaining focus accuracy.
2Stability of the object's composition
If conventional magnification correction techniques are applied to interchangeable lens systems, then the angle of view can be maintained constant, but the system complexity increases due to additional communication and calculation requirements
Solution Approach 1:
The patent implements feedback by having the lens apparatus measure and communicate the actual focal length to the imaging apparatus, which then uses this feedback information to calculate and apply the appropriate magnification correction. This closed-loop feedback mechanism maintains angle of view consistency while keeping the system relatively simple by utilizing existing communication interfaces.
Solution Approach 2:
The patent introduces an intermediary correction unit that acts as a mediator between the lens apparatus and the image output. This correction unit receives the captured image and the focal length variation information, calculates the necessary magnification adjustment, and produces the corrected image, thereby maintaining angle of view consistency without requiring complex modifications to the lens or camera body.
3Reliability
If the focus lens drive is limited to reduce angle of view variation, then the moving image quality is improved, but the driving speed of the focus lens is reduced
Solution Approach 1:
The patent replaces the mechanical approach of limiting focus lens drive speed with a digital/image processing approach. Instead of mechanically constraining the focus lens movement speed, the system allows the lens to drive at full speed and applies digital magnification correction to the captured images, thereby maintaining moving image quality without sacrificing focus response speed.
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 system effectively reduces angle-of-view variation degradation in moving image quality by accurately correcting image magnification, enabling faster and more efficient focus lens drive while maintaining image stability across various lenses.
Implementation Method 1
a sensor configured to photoelectrically convert an optical image formed via the lens apparatus
Data Source
AI summary
A lens apparatus having a focus lens can be detachably attached to an imaging apparatus. A sensor of the imaging apparatus photoelectrically converts an optical image formed via the lens apparatus. A generation unit generates an image based on an image signal output from the imaging apparatus. The imaging apparatus receives information about a focal length variation from the lens apparatus received by a lens communication control unit configured to control communication with the lens apparatus, and an image magnification variation correction control unit corrects the magnification of the image based on the information.