Optical Reader Polarization Sensor Illumination Control
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Solution Overview
Problem
Existing optical readers face challenges in effectively reading decodable indicia, particularly barcodes, on both non-backlit substrates like paper and backlit screens, due to differences in light polarization, which affects the illumination needed for accurate decoding.
Innovation Solution
The development of an indicia reading terminal equipped with a polarization sensor that senses light polarization from decodable indicia, controlling the illumination subsystem to either energize or inhibit light projection based on the polarization detected, allowing for optimized image capture and decoding of barcodes on various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the illumination subsystem is always energized to ensure sufficient light for reading, then the reading capability is improved, but the energy consumption increases
Solution Approach 1:
The polarization sensor performs preliminary detection of the substrate's polarization characteristics before the illumination subsystem is activated. This allows the system to pre-determine the appropriate illumination strategy, energizing the illumination subsystem only when necessary (for non-polarized substrates) and avoiding unnecessary energy consumption while maintaining reading capability.
2Measurement precision
If the illumination subsystem is energized for reading barcodes on non-backlit substrates, then the reading capability is improved, but it creates interference when reading barcodes on backlit screens
Solution Approach 1:
The polarization sensor provides feedback about the substrate's polarization state to the control logic, which then adjusts the illumination subsystem's operation accordingly. When backlit screens are detected (polarized light), the feedback signal causes the control logic to inhibit or reduce illumination subsystem operation, eliminating light interference. When non-backlit substrates are detected (non-polarized light), the feedback signal enables full illumination subsystem operation for optimal reading capability.
3Device complexity
If the system uses a fixed illumination strategy, then the device complexity is reduced, but the adaptability to different substrates deteriorates
Solution Approach 1:
The system transitions from a fixed illumination strategy to a dynamic, adaptive illumination strategy. The polarization sensor continuously monitors substrate characteristics, and the control logic dynamically adjusts the illumination subsystem's operation in real-time based on detected polarization states, enabling the system to adapt to different substrate types (backlit screens, non-backlit paper, electronic paper) while maintaining relatively simple hardware architecture.
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 terminal to efficiently read and decode barcodes on both non-backlit substrates and backlit screens by tailoring the illumination, improving its operational range and accuracy across different environments.
Implementation Method 1
sensing the polarization of light from a plurality of orientations in connection with the decodable indicia
Data Source
AI summary
A method for decoding decodable indicia includes sensing the polarization of light from a plurality of orientations in connection with the decodable indicia, and controlling at least one of energizing an illumination subsystem based on the sensed polarization indicating a generally randomly polarized light, and inhibiting energization of the illumination subsystem based on the sensed polarization indicating a generally linearly polarized light. One or more images are captured, and an attempt is made to decode the decodable indicia using at least one of the one or more images.