Camera Module Autofocus Lens Control for Image Wobbling
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Solution Overview
Problem
Electronic devices with auto focusing functions experience image wobbling due to frequent movement of the focus lens during the focusing process, which affects the stability of the field of view displayed on the screen.
Innovation Solution
An electronic device with a camera module and a processor that captures and compares images at different focus lens positions to calculate the defocus amount and detect the on-focus region, allowing for controlled movement of the focus lens to prevent image wobbling by limiting the output of secondary images until the defocus amount is calculated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the focus lens is moved frequently to adjust focus, then the auto focusing function is achieved, but the image field of view shakes and wobbles
Solution Approach 1:
The processor outputs the first image obtained at the first lens position before obtaining subsequent images at different lens positions. This preliminary output action maintains a stable display during the focusing process, preventing image wobbling while the focus lens moves to achieve auto focusing.
Solution Approach 2:
The first image obtained at the first lens position serves as an intermediary display element. By outputting this intermediate image rather than continuously displaying images from varying lens positions, the system mediates between the moving focus lens and the display, eliminating the wobbling effect while maintaining stable visualization.
2Measurement precision
If the focus lens position is changed to achieve focusing, then the focus is adjusted, but the image magnification changes non-linearly causing wobbling
Solution Approach 1:
The system obtains and outputs the first image at a reference lens position before making further adjustments. This preliminary establishment of a baseline image provides a stable reference that compensates for non-linear magnification changes during subsequent focus adjustments, preventing wobbling while maintaining focusing precision.
Data Source
AI summary
A method and an apparatus for operating an electronic device is provided. A first image is obtained at a first position of a focus lens of a camera module of the electronic device. The first image is output through a display. A second image is obtained at a second position of the focus lens while the first image is being output. A defocus amount of the focus lens at the second position is calculated based on the first image and the second image. An on-focus region is detected based on the calculated defocus amount.