Single Camera Polarization Measurement via Orientation Maneuvering
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Solution Overview
Problem
Current systems for measuring polarization of light in images, particularly for moving vehicles, are hindered by high cost, weight, and reliability issues due to the need for multiple cameras or complex optical components like filter wheels and rotating polarizers.
Innovation Solution
A method and system that utilize a single camera with a polarizing filter, where the camera and filter are maneuvered to different orientations to capture images, which are then registered and processed to compute polarization values, eliminating the need for multiple cameras or moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter wheel with multiple polarizing filters is used, then polarization measurement capability is improved, but weight and device complexity increase
Solution Approach 1:
The patent extracts the moving parts (filter wheel mechanism) from the system and replaces them with a fixed polarizing filter. The polarization measurement capability is achieved by capturing images at different camera orientations rather than rotating filters, thereby eliminating the heavy mechanical components while maintaining measurement functionality.
Solution Approach 2:
The patent replaces the mechanical filter wheel system with a computational approach. Instead of mechanically rotating filters to change orientation, the system uses a fixed filter combined with camera orientation changes and post-processing algorithms to achieve the same polarization measurement results, eliminating mechanical complexity and weight.
2Measurement precision
If a rotating polarizer is used, then polarization measurement capability is improved, but weight and reliability decrease
Solution Approach 1:
The patent removes the rotating polarizer mechanism entirely from the system. Instead of using a rotating component to achieve different polarization orientations, the system employs a fixed polarizing filter and achieves orientation diversity through camera positioning and computational processing, thereby eliminating the reliability issues associated with moving parts.
Solution Approach 2:
The patent transitions from a static filter orientation to a dynamic measurement approach by capturing images at multiple camera orientations. This allows the system to achieve polarization measurement capability without requiring the filter itself to rotate, maintaining reliability while preserving measurement functionality.
3Measurement precision
If multiple cameras are used, then polarization measurement capability is improved, but cost and device complexity increase
Solution Approach 1:
The patent merges the functions of multiple cameras into a single camera system. By using one camera with a fixed polarizing filter and capturing images at different orientations, the system achieves the same polarization measurement capability that would otherwise require multiple cameras, thereby reducing system complexity and cost.
Solution Approach 2:
The patent makes a single camera perform multiple functions: it captures images for both standard photography and polarization measurement by varying its orientation. This multi-functional approach eliminates the need for dedicated polarization measurement cameras, reducing overall system complexity while maintaining measurement capability.
4Measurement precision
If pixel-by-pixel polarizing filters are used, then polarization measurement capability is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent extracts the complex pixel-by-pixel filter structure and replaces it with a single macroscopic polarizing filter positioned in front of the camera lens. This approach maintains polarization measurement capability while using commercially available, easily manufactured filter components rather than requiring custom-fabricated pixel-level structures.
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 reduces weight, cost, and increases reliability by simplifying the system, allowing for concurrent color imaging and polarimetry without the need for new electronic fabrication processes, while maintaining high photonic efficiency.
Implementation Method 1
A polarizing filter can be placed in front of the camera lens. The camera can then be maneuvered (or the aircraft can be maneuvered) to different orientations, thereby orienting the polarizing filter in different directions.
Data Source
AI summary
Systems capable of acquiring polarimetry data using a single camera with or without a polarizing filter. When a polarizing filter is used, the data acquisition method comprises: (1) maneuvering the aircraft (or other vehicle) to orient the polarizing filter (and camera) in various directions when images are captured, (2) registering the various images to each other, and (3) computing polarimetry values (such as the Stokes parameters) for points of interest in the images. When a polarizing filter is not used, the data acquisition method comprises maneuvering the aircraft (or other vehicle) to orient the camera in various directions when images are captured and then performing the same operations (2) and (3). These methods measure the amount of polarization in a given scene by taking multiple camera images at different angles.