Adaptive Exposure Control for Image Brightness and Noise Reduction
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Solution Overview
Problem
Current automatic exposure control in image capture devices can introduce motion streaks and noise in images, failing to ensure optimal brightness and definition across varying lighting conditions.
Innovation Solution
An electronic device with a processor that adjusts exposure time, gain, and aperture based on a target frame brightness value, using an exposure table and weight calculations to determine optimal parameter values, ensuring expected brightness and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If automatic exposure control adjusts exposure parameters to achieve expected brightness, then image brightness is improved, but motion streak and noise are increased
Solution Approach 1:
The patent applies dynamics by making the exposure parameter selection adaptive to scene characteristics. The system dynamically determines whether to use exposure parameters from the first table (for static scenes) or the second table (for moving scenes) based on motion detection, thereby optimizing the balance between brightness and motion streak reduction in real-time
Solution Approach 2:
The patent applies local quality by creating different exposure parameter sets tailored to specific scene conditions. The first exposure parameter table is optimized for static scenes while the second table is optimized for moving scenes, allowing the system to apply the most appropriate parameters locally according to the detected scene type
2Manufacturing precision
If exposure parameters are adjusted to reduce motion streak, then image definition is improved, but brightness control becomes less accurate
Solution Approach 1:
The system dynamically switches between two distinct exposure parameter tables based on scene motion characteristics. This dynamic adaptation allows the system to maintain optimal brightness control for static scenes while using motion-optimized parameters for moving scenes, resolving the trade-off between brightness accuracy and motion streak reduction
3Reliability
If multiple exposure parameter tables are used to handle different scene types, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the exposure parameter space into two distinct tables: the first exposure parameter table for static scenes and the second exposure parameter table for moving scenes. This segmentation allows each table to be optimized for its specific purpose, improving overall image quality while maintaining manageable complexity through clear separation of concerns
Solution Approach 2:
The system uses scene detection feedback to determine which exposure parameter table to apply. By continuously monitoring scene characteristics and automatically selecting the appropriate parameter set, the system maintains high image quality without requiring complex manual intervention or configuration
Data Source
AI summary
The present disclosure relates to systems and methods for exposure control. The systems and methods may obtain a target frame brightness value of the image. The systems and methods may also obtain an exposure mode of the electronic device. The systems and methods may also obtain an exposure table corresponding to the exposure mode. The systems and methods may also determine a target value, corresponding to the target frame brightness value, for each of the one or more exposure parameters based on the exposure table. The systems and methods may also adjust one or more of the at least one lens, the at least one exposure-time controller, and the at least one sensor according to the target values of the one or more exposure parameters.