Reading Device Color Correction Without a Calibration Chart
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Solution Overview
Problem
Existing image reading devices face challenges in correcting color variations caused by wavelength changes in light sources without imaging a color chart.
Innovation Solution
A reading device that emits a first and second light band towards a target object, using an imager with photoelectric conversion elements sensitive to different wavelengths, and circuitry to correct the first color read value based on the second color read value, without the need for a color chart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a color chart is used for correction, then color accuracy is improved, but operation time and complexity increase
Solution Approach 1:
The system uses the target object itself to perform correction by capturing images at different exposure times. The bright area in the first image and dark area in the second image provide self-contained correction data, eliminating the need for external color charts or reference objects.
Solution Approach 2:
The system performs preliminary correction by capturing reference information (bright and dark areas) during the normal imaging process itself. This preliminary data capture happens simultaneously with the target object imaging, so no additional time is required for separate correction operations.
2Measurement precision
If multiple light bands are used, then color correction capability is improved, but device complexity increases
Solution Approach 1:
The system uses dynamic exposure time variation instead of static multi-light-band hardware. By changing the exposure time of the single light source, the system creates different brightness conditions that provide correction information, avoiding the need for multiple physical light bands or complex optical filters.
Solution Approach 2:
The system changes the exposure time parameter to generate correction data. By varying the exposure time between first and second images, the system creates bright and dark area information that enables color correction without adding physical complexity to the optical system.
3Device complexity
If wavelength changes in light source are not corrected, then device simplicity is maintained, but color reproduction accuracy deteriorates
Solution Approach 1:
The system captures feedback information from the target object itself (bright and dark areas) and uses this feedback to calculate and apply correction values. This feedback mechanism enables automatic color reproduction accuracy improvement without requiring complex external correction systems.
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
Effectively corrects color variations due to light source deterioration, ensuring accurate color reproduction without the time and effort required for imaging a color chart.
Implementation Method 1
an imager including multiple photoelectric conversion elements, each photoelectric conversion element configured to be sensitive to one of multiple light reception wavelengths; and circuitry. The imager receives light having the multiple light reception wavelengths reflected from the reading target object
Data Source
AI summary
A reading device includes a light source configured to emit a first light band and a second light band towards a reading target object, the first and second light bands being different; an imager including multiple photoelectric conversion elements, each photoelectric conversion element configured to be sensitive to one of multiple light reception wavelengths; and circuitry. The imager receives light having the multiple light reception wavelengths reflected from the reading target object; outputs a first color read value of the reading target object with a first color having a first light reception wavelength of the multiple light reception wavelengths; and outputs a second color read value of the reading target object with a second color having a second light reception wavelength of the multiple light reception wavelengths. The circuitry corrects the first color read value based on the second color read value and output the corrected first color read value.