Adaptive Exposure Compensation for High Dynamic Range Imaging
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Solution Overview
Problem
High dynamic range images captured by terminal devices often suffer from overexposure or underexposure due to varying shooting environments, resulting in low image quality and user experience.
Innovation Solution
A method that determines exposure compensation values by analyzing the relationship between brightness values and pixel ratios in different color channels, allowing for adaptive exposure adjustments to improve image quality and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Auto Exposure Control (AEC) is used to capture normal exposure image with preset underexposed value and preset overexposed value, then high dynamic range image can be obtained through image fusion, but the captured image may be overexposed or underexposed due to large difference between actual shooting environments, resulting in low image quality
Solution Approach 1:
The patent changes exposure parameters dynamically by analyzing color channel characteristics (RGB histograms) and pixel brightness distributions. It calculates exposure compensation values based on the relationship between brightness values and pixel ratios in different color channels, allowing the system to adapt exposure settings to match actual shooting environments rather than using fixed preset values.
Solution Approach 2:
The patent implements a feedback mechanism where the system analyzes the captured image's color channel distribution and brightness characteristics, then uses this information to calculate and apply appropriate exposure compensation values. This closed-loop approach ensures that exposure adjustments are based on actual scene conditions, improving both adaptability and precision.
2Productivity
If fixed preset underexposed value and preset overexposed value are used for capturing images, then the capture process is simple and fast, but the exposure compensation cannot adapt to different shooting scenes, resulting in poor image quality
Solution Approach 1:
The patent performs preliminary analysis of the shooting scene by examining color channel histograms and brightness distributions before finalizing exposure compensation values. This preliminary action allows the system to quickly assess scene characteristics and determine appropriate compensation values, maintaining fast capture speed while achieving scene-specific adaptation.
Solution Approach 2:
The system dynamically changes exposure parameters based on real-time analysis of image data. By calculating exposure compensation values from the relationship between brightness values and pixel ratios in different color channels, the system achieves rapid adaptation to different shooting scenes without sacrificing capture speed.
Data Source
AI summary
A method and device for obtaining exposure compensation values of a high-dynamic-range image, wherein the method includes: a relationship between brightness values and pixel ratios in different color channels corresponding to a current scene is determined; an underexposure degree and an overexposure degree of the current scene are determining, according to a preset normal exposure brightness threshold, a preset pixel ratio threshold, and the relationship between brightness values and pixel ratios; and an underexposure compensation value and an overexposure compensation value of the current scene are determined, according to the underexposure degree and the overexposure degree of the current scene.