Switched Polarization Imaging for Display Detection
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Solution Overview
Problem
Current imaging systems face challenges in effectively detecting and identifying display screens within their field of view, particularly in environments with varying polarization states and lighting conditions, which affects their ability to recognize and map display screens accurately.
Innovation Solution
The implementation of a macrostructured polarizer and active polarization filter systems in imaging systems, which utilize differently configured polarizer portions and electronically switchable filters to acquire and compare digital images with different polarization filtering, allowing for the detection of display screens by analyzing light intensity differences and polarization states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional imaging systems are used without polarization filtering, then the system structure remains simple, but the ability to detect display screens in varying polarization states and lighting conditions deteriorates
Solution Approach 1:
The imaging system divides the sensor array into multiple regions, with each region having different polarization filtering characteristics. This segmentation allows the system to capture polarization information across different orientations simultaneously, improving display screen detection accuracy without requiring a complete polarization switching system.
Solution Approach 2:
Different portions of the sensor array are assigned different polarization filter orientations. This local differentiation enables the system to detect display screens with various polarization states by analyzing the differential response across different sensor regions, achieving reliable detection while maintaining relatively simple overall system architecture.
2Measurement precision
If polarization filtering is added to detect display screens, then detection precision improves, but the complexity of the imaging system increases
Solution Approach 1:
The sensor array is segmented into multiple regions with different polarization filter orientations, allowing the system to measure polarization states by comparing signals from different segments. This approach achieves precise polarization detection without requiring complex polarization switching mechanisms.
Solution Approach 2:
Instead of using a single sensor with switching polarization filters, the system uses multiple sensors with fixed different polarization filter orientations. This copying approach eliminates the need for mechanical or electronic polarization switching while maintaining the ability to detect various polarization states with high precision.
3Manufacturing precision
If multiple polarization filter orientations are used, then display screen recognition accuracy improves, but the number of components and system complexity increases
Solution Approach 1:
The imaging sensor is divided into multiple regions, each with a different fixed polarization filter orientation. This segmentation allows the system to capture polarization information for multiple orientations simultaneously in a single image, improving recognition accuracy without requiring multiple separate imaging systems or complex switching mechanisms.
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 approach enables precise detection and identification of display screens, even with varying polarization states, by comparing light intensities and polarization filtering responses, thereby enhancing the accuracy of display screen recognition and mapping in complex environments.
Implementation Method 1
a polarization filter including a plurality of polarizer portions, each of the plurality of polarizer portions being configured to transmit only light having a polarization axis in a predetermined direction
Data Source
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AI summary
An imaging system comprises an optical sensor array with a plurality of sensor elements, an objective lens, an active polarization filter, and associated logic. The objective lens is configured to direct light from a field of view onto the plurality of sensor elements. Switchable electronically between first and second operational states, the active polarization filter is positioned to filter the light en route to the optical sensor array. The active polarization filter provides unequal relative attenuance, in the first versus the second operational state, of nonparallel polarization components of the light. The logic is configured to switch the active polarization filter from the first operational state to the second operational state, and to compare a light-intensity response of the plurality of sensor elements in the first operational state to the light-intensity response of the plurality of sensor elements in the second operational state.