Imaging Pixel-Unit Exposure Ratio Control for Brightness Adaptation
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Solution Overview
Problem
Existing imaging devices face challenges in maintaining image quality due to poor adjustment of exposure pixel ratios in varying ambient brightness levels, leading to loss of details and uneven brightness in images.
Innovation Solution
A control method that adjusts the ratio of medium-exposure pixels in photosensitive pixel-units based on ambient brightness levels, switching between short-, medium-, and long-exposure pixels to optimize image capture, thereby retaining more image details and improving brightness and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed pixel-cell array structure is used for imaging, then the device structure is simple, but image quality deteriorates in varying ambient brightness levels due to poor exposure pixel ratio adjustment
Solution Approach 1:
The patent applies dynamics by making the pixel-cell array structure adjustable rather than fixed. The pixel units can dynamically switch between different exposure pixel ratios (short-exposure, medium-exposure, long-exposure pixels) based on ambient brightness levels, allowing the imaging device to adapt to varying lighting conditions while maintaining good image quality
Solution Approach 2:
The patent changes the exposure ratio parameter of pixels based on ambient brightness conditions. By adjusting the proportion of short-, medium-, and long-exposure pixels according to lighting levels, the system optimizes image quality for different brightness scenarios without requiring a complete redesign of the pixel array
2Manufacturing precision
If the ratio of medium-exposure pixels is increased, then image details are better retained in high or low brightness, but device complexity increases due to multiple pixel types
Solution Approach 1:
The patent segments each pixel unit into multiple exposure pixels (short-exposure, medium-exposure, long-exposure) with different exposure characteristics. This segmentation allows the system to capture details across different brightness ranges simultaneously, improving image detail retention while managing complexity through modular pixel design
Solution Approach 2:
The patent makes pixel units multi-functional by incorporating multiple exposure pixel types within each unit. The same pixel unit can adapt its exposure characteristics based on ambient brightness, providing universal functionality across different lighting conditions without requiring separate imaging systems for each scenario
3Ease of operation
If exposure pixel ratios are not adjusted according to ambient brightness, then device operation is simple, but image brightness uniformity deteriorates leading to over/underexposure
Solution Approach 1:
The patent implements self-service by enabling the imaging device to automatically adjust its own exposure pixel ratios based on detected ambient brightness levels. The system monitors lighting conditions and autonomously optimizes the mix of short-, medium-, and long-exposure pixels to achieve uniform image brightness without requiring manual intervention
Solution Approach 2:
The patent uses feedback by continuously monitoring ambient brightness conditions and adjusting the exposure pixel ratios accordingly. The system measures the current lighting environment and uses this information to dynamically reconfigure the pixel array, ensuring optimal brightness uniformity across different shooting scenarios
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances image quality by automatically adjusting exposure pixel ratios according to ambient conditions, reducing noise and over/underexposure, and improving the user's shooting experience, especially in backlit scenes.
Implementation Method 1
each photosensitive pixel-unit of the photosensitive pixel-units includes at least two exposure pixels, the at least two exposure pixels include at least one medium-exposure pixel
Data Source
AI summary
A control method in an imaging device is provided. The imaging device includes a pixel-cell array including a plurality of photosensitive pixel-units, each photosensitive pixel-unit of the photosensitive pixel-units includes at least two exposure pixels including at least one medium-exposure pixel. The method includes determining an ambient brightness level of a photographing environment; adjusting a first ratio to be a first value, in response to a brightness level of the photographing environment belonging to a high-level or a low-level, wherein the first ratio indicates a ratio of the at least one medium-exposure pixel in the each photosensitive pixel-unit; and adjusting the first ratio to be a second value, in response to the brightness level of the photographing environment belonging to a medium-level, wherein the low-level, the medium-level, and the high-level are in an ascending order, and the first value is greater than the second value.