Vehicle Window Reflection Elimination Using Polarization Filtering
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Solution Overview
Problem
Existing video monitoring systems for vehicles struggle to effectively eliminate the reflection of strong light from vehicle windows, particularly when the reflection forms a sky image, which interferes with the capture of interior conditions within the vehicle.
Innovation Solution
A vehicle monitoring method and system that calculates the polarization angle of polarized light in a sky image reflected by a vehicle window, uses this angle to determine a light-filtering polarization angle, and filters out the polarized light using a polarization light-filtering system, allowing for clear imaging of the vehicle interior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-optical-path camera system is used to eliminate window reflection, then the reflection elimination effect is improved, but the optical structure complexity and cost increase
Solution Approach 1:
The patent extracts and removes the harmful polarized reflection light from the optical path using a polarizing filter, separating the useful transmitted light from the harmful reflected light. This eliminates the need for complex dual-optical-path systems while achieving reflection elimination.
Solution Approach 2:
The patent changes the polarization parameter of the reflected light by using a polarizing filter oriented at specific angles (90 degrees to the polarization direction of reflected light) to block polarized reflections while allowing non-polarized transmitted light to pass through.
2Reliability
If a short-wave infrared camera system is used to eliminate window reflection, then the reflection elimination effect is improved, but the image quality (color information) deteriorates
Solution Approach 1:
The patent changes the polarization parameter of light to differentiate between reflected and transmitted light. By using a polarizing filter, the system maintains visible light transmission for color imaging while selectively blocking polarized reflections, thus preserving color information unlike infrared systems.
3Device complexity
If traditional monitoring systems are used without polarization filtering, then the system structure remains simple, but the monitoring accuracy deteriorates due to window reflection interference
Solution Approach 1:
The patent introduces a polarizing filter as an intermediary element in the optical path. This simple component acts as a mediator that selectively blocks polarized reflected light while allowing non-polarized transmitted light to pass, improving monitoring accuracy without significantly complicating the system structure.
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 solution effectively reduces the influence of window reflections, simplifies the optical structure of the monitoring system, and allows for the clear acquisition of both external and internal vehicle conditions, thereby enhancing the comprehensive monitoring of vehicles.
Implementation Method 1
a polarization angle of polarized light in a sky image reflected by a vehicle window in a monitoring scenario is calculated
Implementation Method 2
light provided by a sky region corresponding to the sky image is incident into a camera of a monitoring system after being reflected by the vehicle window
Data Source
AI summary
Provided are a vehicle monitoring method and a vehicle monitoring system. The vehicle monitoring method includes that: a polarization angle of polarized light in a sky image reflected by a vehicle window in a monitoring scenario is calculated, and a light-filtering polarization angle is calculated according to the polarization angle of the polarized light in the sky image reflected by the vehicle window, where the polarized light in the sky image is formed by scattered sunlight in a sky region corresponding to the sky image; the polarized light in the sky image reflected by the vehicle window in the monitoring scenario is filtered out according to the light-filtering polarization angle; and the monitoring scenario is imaged to form a monitoring image.