Adjustable Polarization Filter for Specular Reflection Reduction
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Solution Overview
Problem
Existing imaging systems struggle to effectively reduce or eliminate unwanted specular reflections from transparent and reflective surfaces, which can render objects invisible or unrecognizable.
Innovation Solution
The implementation of an imaging system that includes an adjustable polarization filter positioned between the specular surface and the image sensor, allowing for the reduction or elimination of unwanted reflections without the need for on-site light polarization measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a polarization filter is used to reduce specular reflections, then image quality and object visibility are improved, but device complexity increases due to the need for filter adjustment mechanisms
Solution Approach 1:
The patent implements an adjustable polarization filter that can dynamically change its orientation angle based on detected reflection characteristics. The filter is positioned at a variable angle relative to the optical axis, allowing the system to adapt to different reflection conditions and optimize image quality by minimizing specular reflections through dynamic repositioning.
Solution Approach 2:
The system changes the polarization filter's angular parameter to optimize reflection reduction. By varying the filter angle relative to the optical axis based on detected reflection intensity and polarization characteristics, the system adapts to different scene conditions and maintains optimal image quality without requiring complex mechanical adjustments.
2Reliability
If multiple image sensors are used to capture images from different directions, then reflection reduction capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent divides the image sensor array into multiple groups, where each group is associated with a specific polarization filter orientation. This segmentation allows different sensor groups to capture images optimized for different reflection conditions, enabling the system to select the most appropriate images based on the detected reflection characteristics without requiring all sensors to operate simultaneously.
Solution Approach 2:
The system uses a single image sensor array that serves multiple functions by capturing images with different effective polarization orientations. The sensor array can function as multiple specialized sensors depending on which sensors are activated and how their data is processed, reducing the need for physically separate sensors for each orientation.
3Adaptability or versatility
If an adjustable polarization filter is implemented, then adaptability to different reflection conditions is improved, but ease of operation decreases due to automated control requirements
Solution Approach 1:
The system performs self-adjustment by automatically detecting reflection characteristics and autonomously determining the optimal polarization filter orientation. The processor analyzes captured images to identify specular reflections, calculates the appropriate filter angle, and adjusts the filter positioning without requiring manual intervention, enabling the system to adapt to changing conditions while maintaining ease of operation.
Solution Approach 2:
The system implements a feedback loop where images captured by the sensor array are analyzed to detect reflection characteristics, and this information is used to adjust the polarization filter orientation. The processor continuously monitors image quality and reflection intensity, adjusting the filter angle in response to feedback from the detected scene conditions, enabling automatic adaptation to varying reflection environments.
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 enables the acquisition of clear images of objects behind transparent and specular surfaces by minimizing specular reflections, thereby improving image quality and object visibility.
Implementation Method 1
The implementation of an imaging system that includes an adjustable polarization filter positioned between the specular surface and the image sensor, allowing for the reduction or elimination of unwanted reflections
Data Source
Figure 1A~1D
Figure 2A~2D
Figure 3
AI summary
Embodiments pertain to an imaging system configured to reduce or prevent the effect of unwanted specular reflections reflected by specular surfaces located in a scene. The system comprises at least one image acquisition device for acquiring a scene image comprising a specular surface providing specular light reflections. The at least one image acquisition device comprises at least one first image sensor and imaging optics having an optical axis for guiding light received from the scene along the optical axis onto the at least one first image sensor. The system further comprises at least one polarization filter operably positioned between the at least one first image sensor and an object. The system is configured to determine a polarization filter orientation such that an amount of specular light reflections incident onto the at least one first image sensor is reduced or eliminated.