Multi-Camera Exposure Adjustment via Dynamic Feedback
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Solution Overview
Problem
Conventional high dynamic range (HDR) image synthesis methods using autobracketing to capture images with different exposure values often result in suboptimal image quality in various photographing scenes.
Innovation Solution
A camera device with multiple camera modules and a processing module that continuously captures images in sync, adjusts exposure values based on current and previous images, meeting specific conditions related to pixel values and differences, to optimize image capture across different scenes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional autobracketing method is used to capture images with different exposure values, then HDR image can be synthesized, but image quality is not good enough in some photographing scenes
Solution Approach 1:
The patent applies dynamics by continuously adjusting exposure values of multiple camera modules in real-time based on feedback from captured images. The system dynamically modifies exposure parameters (EV) for each camera module based on the current scene conditions, transitioning from static predetermined exposure settings to adaptive dynamic adjustment, thereby improving image quality across diverse photographing scenes
Solution Approach 2:
The patent implements feedback by using the processing module to analyze captured images and determine whether pixel value conditions are met. Based on this feedback, the system automatically adjusts exposure values for subsequent images. This closed-loop feedback mechanism enables the system to adapt to different scene conditions and improve image quality by correcting exposure issues in real-time
2Manufacturing precision
If exposure value is reduced for the first camera module to meet pixel value conditions, then image detail in bright portions is improved, but capture time and processing iterations increase
Solution Approach 1:
The patent applies segmentation by dividing the image capture task across multiple camera modules (first to Mth modules), where each module captures images at different exposure values simultaneously. This parallel segmentation allows the system to obtain multiple exposure variants in one capture cycle, reducing the need for repeated captures and minimizing time loss while ensuring accurate pixel value coverage
Solution Approach 2:
The patent implements preliminary action by having multiple camera modules pre-capture images at different exposure values before the final synthesis. The first camera module is prepared to capture at reduced exposure values, and other modules are simultaneously positioned to capture complementary exposure data, ensuring all necessary pixel value ranges are covered in advance, thus avoiding iterative recaptures
Data Source
AI summary
A method for adjusting exposure of a camera device is provided to include steps of: using first to Mth camera modules to continuously capture images in sync; reducing an exposure value of the first camera module according to a first current image captured at a latest time point by the first camera module until a first condition associated with the first current image is met; adjusting an exposure value of an ith camera module according to an ith current image, which is captured at the latest time point by the ith camera module, and an (i−1)th previous image, which is captured at a time point immediately previous to the latest time point by an (i−1)th camera module.