Exposure Control Method for Night Scene Image Quality
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Solution Overview
Problem
Mobile terminal devices struggle to capture high-quality images in night scenes due to low dynamic range and high noise levels, caused by low ambient light luminance, leading to poor user experience.
Innovation Solution
An exposure control method that determines target exposure based on ambient light luminance, adjusts exposure time and photo-sensitivity, and updates exposure time when it exceeds a certain limit to improve image quality, reducing noise and enhancing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If exposure time is increased to improve image brightness in low light conditions, then image brightness is improved, but image shake and blur increase
Solution Approach 1:
The system performs preliminary detection of ambient light luminance and shake degree before capturing the image. Based on these detections, it pre-calculates and sets the optimal exposure time and photo-sensibility parameters, ensuring that the exposure time does not exceed the upper limit that would cause noticeable shake, thus preventing blur before it occurs
Solution Approach 2:
The system dynamically adjusts exposure parameters (exposure time and photo-sensibility) based on detected ambient light conditions and shake degree. By changing these parameters adaptively and setting an upper limit on exposure time, the system improves image brightness while maintaining image stability
2Illumination intensity
If photo-sensibility is increased to improve image brightness, then image brightness is improved, but noise level increases
Solution Approach 1:
The system dynamically adjusts photo-sensibility based on ambient light luminance detection. By optimizing the photo-sensibility parameter according to actual lighting conditions and combining it with controlled exposure time within the upper limit, the system achieves improved image brightness while suppressing noise generation
3Illumination intensity
If exposure time is extended to capture more light, then dynamic range is improved, but image shake becomes noticeable
Solution Approach 1:
The system performs preliminary detection of ambient light luminance and shake degree before capturing the image. Based on these detections, it pre-calculates and sets the optimal exposure time and photo-sensibility parameters, ensuring that the exposure time does not exceed the upper limit that would cause noticeable shake, thus preventing blur before it occurs
Solution Approach 2:
The system dynamically adjusts exposure parameters (exposure time and photo-sensibility) based on detected ambient light conditions and shake degree. By changing these parameters adaptively and setting an upper limit on exposure time, the system improves image brightness while maintaining image stability
Data Source
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AI summary
The disclosure provides an exposure control method, an exposure control device, an electronic device and a computer readable storage medium. The method includes: determining (101) a target exposure for an image to be captured based on ambient light luminance; determining (102) an exposure time for the image to be captured based on the target exposure and a preset photo-sensibility for the image to be captured; in response to determining that the exposure time for the image to be captured is greater than an upper limit, updating (103) the exposure time for the image to be captured based on the upper limit; and performing (104) an exposure control based on the exposure time and the photo-sensibility for the image to be captured.