Dynamic Exposure Adjustment for HDR Image Quality
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Solution Overview
Problem
Current image capturing devices using HDR technology face challenges in selecting optimal exposure levels, leading to poor image quality due to limited exposure settings, resulting in abnormal effects such as overexposed or underexposed scenarios.
Innovation Solution
A method that determines a first exposure proportion of a preview image and adjusts exposure brightness adjustment multiples accordingly, capturing multiple groups of images with different exposure settings and compositing them to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed exposure levels are used for HDR capture, then the capturing process is simple, but image quality deteriorates due to overexposed or underexposed scenarios
Solution Approach 1:
The patent applies dynamics by making the exposure brightness adjustment multiples adjustable based on exposure proportion rather than fixed. The system dynamically determines first, second, and third exposure brightness adjustment multiples according to the calculated exposure proportion, allowing the exposure settings to adapt to different lighting conditions and scene requirements, thereby improving image quality while maintaining operational simplicity
Solution Approach 2:
The patent changes the exposure parameters by introducing exposure proportion as a basis for determining multiple adjustment multiples. Instead of using fixed EV values, the system calculates exposure proportion and uses it to determine appropriate brightness adjustment multiples, enabling flexible parameter adaptation to different capturing scenarios and resolving the contradiction between simplicity and image quality
2Device complexity
If limited exposure levels are used, then the capturing process is straightforward, but the ability to handle special scenarios deteriorates
Solution Approach 1:
The system dynamically determines exposure brightness adjustment multiples based on calculated exposure proportion, allowing the same device to adapt to various special scenarios including overexposed, underexposed, and normal lighting conditions. This dynamic approach enables the device to handle diverse requirements without increasing physical complexity
Solution Approach 2:
The patent introduces exposure proportion as a calculated parameter that drives the selection of appropriate brightness adjustment multiples. By changing from fixed exposure levels to parameter-driven dynamic exposure levels, the system achieves high adaptability to special scenarios while maintaining straightforward operation
3Ease of operation
If fixed EV values are used for overexposed and underexposed scenarios, then the capturing method is simple, but image quality deteriorates due to abnormal artificial effects
Solution Approach 1:
The patent implements feedback by calculating exposure proportion from the captured images and using this information to determine appropriate brightness adjustment multiples. This feedback mechanism ensures that the HDR processing adapts to the actual exposure conditions, preventing abnormal artificial effects while maintaining simple operation through automated calculation and adjustment
Solution Approach 2:
The system changes from using fixed EV values to using dynamically determined brightness adjustment multiples based on exposure proportion. This parameter change allows the HDR processing to adapt to different exposure scenarios, eliminating abnormal effects while keeping the process simple through automated parameter adjustment
Data Source
AI summary
A method and an apparatus for capturing an image are disclosed. In this embodiment, after an exposure brightness adjustment multiple group is determined, the exposure brightness adjustment multiple group is adjusted according to a current exposure proportion. In this way, exposure brightness adjustment multiple groups that are used for capturing images are also different.