Camera Preview Image Scale Invariance During Autofocus
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Solution Overview
Problem
Conventional portable electronic devices with autofocus cameras display preview images that vary in scale with focus settings, causing user annoyance and dissatisfaction due to the scale-variant nature of the images during the autofocus process.
Innovation Solution
A method and apparatus that involve obtaining specific focus-related parameters from the camera module, determining corresponding resize parameters, and performing an image resize operation to display images in a scale-invariant or quasi-scale-invariant manner, ensuring consistent image scaling across multiple preview images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If autofocus procedure changes focus distance to achieve focus control, then focus quality is improved, but image scale becomes variant causing user annoyance
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the image scale parameter in reverse proportion to the focus distance changes. When the focus distance changes during autofocus, the system calculates a corresponding scale adjustment parameter and applies it to the preview image to compensate for the scale variation, thereby maintaining consistent visual scale while preserving focus quality improvement
Solution Approach 2:
The patent introduces an intermediary scaling mechanism between the focus control module and the display. The preview image processing module acts as a mediator that receives the original preview image and applies scale adjustment based on focus distance changes, producing a scaled preview image that eliminates the direct connection between focus distance variation and display scale variation
2Adaptability or versatility
If focus distance is varied for focus control, then focus adjustment is achieved, but image scale consistency deteriorates
Solution Approach 1:
The system dynamically changes the display scale parameter as a compensatory measure in response to focus distance changes. The processing module calculates the scale adjustment parameter based on the focus distance variation and applies it to maintain consistent image scale, thereby preserving both focus adjustment capability and scale stability
Solution Approach 2:
The patent implements a feedback mechanism where the focus control module's output (focus distance changes) is monitored and fed back to the preview image processing module. This feedback loop enables the system to automatically adjust the image scale in response to focus changes, maintaining scale consistency while allowing focus adjustment
Data Source
AI summary
A method for performing image control in an electronic device and an associated apparatus are provided, where the method may include the steps of: obtaining a specific image from a camera module of the electronic device, and obtaining a specific focus-related parameter corresponding to the specific image, wherein the specific focus-related parameter is related to focus control of the camera module; determining a specific resize parameter corresponding to the specific image according to a relationship between the specific resize parameter and the specific focus-related parameter; and performing a resize operation on the specific image according to the specific resize parameter, to control the specific image to be displayed in a quasi-scale-invariant manner.