Polarization Filter Sensor Brightness Control
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Solution Overview
Problem
Conventional imaging devices face challenges in accurately controlling brightness and exposure when capturing images, especially in scenarios with high reflectance, as they rely on single polarization angles, leading to unnatural image brightness and cumbersome user operations.
Innovation Solution
An electronic device equipped with a sensor having polarizing filters at multiple angles (e.g., 0°, 45°, 90°, 135°) acquires polarization information and calculates an evaluation value by weighting image data from these angles, enabling precise brightness control and automatic exposure adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single polarization angle filter is used for image capture, then the device structure is simple, but the brightness control accuracy deteriorates in high reflectance scenarios
Solution Approach 1:
The polarizing filter is segmented into multiple areas with different polarization angles (0°, 45°, 90°, 135°), allowing the system to capture image data at multiple polarization angles simultaneously. This segmentation enables accurate brightness measurement in high reflectance scenarios without increasing overall device complexity.
Solution Approach 2:
The system changes the polarization angle parameter across different filter areas to optimize brightness control. By acquiring image data at multiple polarization angles and selecting or weighting the most appropriate data based on reflectance characteristics, the system achieves accurate exposure control without manual intervention.
2Manufacturing precision
If manual filter adjustment is required for optimal image capture, then image quality can be optimized, but user operation becomes cumbersome
Solution Approach 1:
The system performs self-service by automatically analyzing image data from multiple polarization angles and selecting the most appropriate data for exposure control. The device autonomously determines the optimal polarization angle based on reflectance characteristics, eliminating the need for manual filter adjustment while maintaining high image quality.
Solution Approach 2:
The system uses feedback from image data acquired at multiple polarization angles to automatically adjust exposure settings. By continuously monitoring the polarization characteristics of reflected light and adjusting the selection of image data accordingly, the system optimizes image quality without requiring user intervention.
3Measurement precision
If image data from multiple polarization angles is acquired, then brightness control accuracy is improved, but data processing complexity increases
Solution Approach 1:
The system acquires image data at multiple polarization angles (excessive action) but only processes and uses the most relevant data for exposure control (partial action). By selecting or weighting specific polarization angle data based on reflectance characteristics rather than processing all data equally, the system maintains high brightness control accuracy while minimizing processing complexity.
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
This solution allows for accurate exposure control and natural image brightness by detecting high reflectance areas and adjusting exposure values, eliminating the need for manual filter adjustments and reducing the acquisition of images with unnatural brightness.
Implementation Method 1
a polarizing filter provided with areas having different polarization angles
Data Source
AI summary
An electronic device acquires polarization information of a subject based on a plurality of pieces of image data based on a first signal output from a first sensor. The first sensor can capture an optical image of the subject acquired via a polarizing filter provided with areas having different polarization angles. The device further acquires an evaluation value for controlling brightness of an image at the time of capturing the optical image of the subject, based on the plurality of pieces of image data. The plurality of pieces of image data have different polarization angles, by respectively being acquired via areas of the polarizing filter having the plurality of different polarization angles. A degree of weighting to be assigned to the plurality of pieces of image data at the time of acquiring the evaluation value based on the polarization information.