Barcode Reader Calibration Light Exposure Control
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Solution Overview
Problem
Imaging-based barcode readers face challenges in achieving optimal image quality under varying ambient light conditions, requiring multiple attempts to set exposure time and gain, which can reduce the life expectancy of the illumination system and lead to suboptimal image capture.
Innovation Solution
A method that generates calibration light when ambient light intensity is low, allowing for measurement and determination of an optimum exposure level for the imaging system, enabling the capture of images with the illumination system only at the determined exposure level, thereby extending the life expectancy of the illumination system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the illumination system is energized at full brightness to ensure adequate image illumination, then the image brightness is sufficient, but the life expectancy of the illumination system decreases
Solution Approach 1:
The patent applies preliminary action by performing a calibration step before actual barcode scanning. During calibration, the illumination system is activated at reduced intensity to allow the imaging system to determine optimal exposure settings. This preliminary calibration prevents the need for repeated full-brightness illumination attempts, thereby extending illumination system life while ensuring adequate image brightness during actual operation.
2Manufacturing precision
If multiple attempts are made to find the optimum exposure setting, then the image quality can be optimized, but the life expectancy of the illumination system is reduced
Solution Approach 1:
The calibration process performs preliminary action by determining optimal exposure settings before actual barcode scanning. The system uses a calibration target with known reflectivity characteristics to establish exposure parameters, eliminating the need for multiple trial attempts during actual scanning operations.
Solution Approach 2:
The patent uses a calibration target that replicates the optical properties of typical barcode labels. By scanning this calibration target first, the system learns the optimal exposure settings that would apply to actual barcodes, avoiding repeated full-intensity illumination attempts on real targets.
3Duration of action of stationary object
If the exposure time is set too short, then the illumination system life is extended, but the image appears dark and quality is poor
Solution Approach 1:
The system implements feedback by using the calibration scan results to automatically determine the optimal exposure time. The imaging system measures the reflected light intensity from the calibration target and adjusts the exposure setting accordingly, ensuring adequate image brightness without requiring prolonged or repeated illumination.
4Manufacturing precision
If the exposure time is set too long, then the image quality is improved, but multiple attempts are required and illumination system life is reduced
Solution Approach 1:
The calibration process performs preliminary measurement of the optical properties of the target surface, allowing the system to calculate the precise exposure time needed for optimal image quality. This eliminates the need for multiple trial attempts with varying exposure times during actual barcode scanning operations.
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 improves the efficiency of image capture by determining the optimal exposure level before full brightness illumination is applied, reducing the need for multiple attempts and prolonging the life of the illumination system while ensuring better image quality.
Implementation Method 1
measuring an intensity of the calibration light reflected into a detector system
Implementation Method 2
An illumination system including light emitting diodes (LEDs) or other light source directs illumination light toward a target object
Data Source
AI summary
A method and apparatus for reading optical indicia. The method includes generating calibration light, and measuring an intensity of the calibration light reflected into a detector system. The method also includes determining an optimum exposure level for the imaging system based on the measured intensity of the calibration light reflected into the detector system, and generating an illumination light with an illumination system. In addition, the method includes capturing an image of the optical indicia with the imaging system subjecting to the optimum exposure level.