Image Reading Device Light Source Color Intensity Calibration
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Solution Overview
Problem
Existing image reading devices face challenges in maintaining consistent light intensity across different color channels, leading to variations in image quality during color and black-and-white reading, which affects the reproducibility of image density and color balance.
Innovation Solution
An image reading device with a light source that adjusts light intensities of multiple colors to ensure values of image information fall within predetermined ranges, using a light intensity adjustment process that involves reading a reference plate to set initial lighting times for LEDs, and applying these settings for both color and black-and-white reading to maintain balanced color ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light intensities of multiple colors are adjusted separately for color reading, then color balance is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary light intensity adjustment by reading a reference plate before actual image reading. The adjustment unit determines appropriate light intensities for each color based on the reference plate reading, and stores these settings for subsequent color and black-and-white reading operations. This preliminary calibration ensures color balance is established before normal operation.
Solution Approach 2:
The light intensity adjustment mechanism serves multiple functions: it adjusts light intensities for color reading, black-and-white reading, and uses the same adjusted intensities for both modes. The adjustment unit and storage unit are designed to handle both color and monochrome reading operations with a single calibrated setting, eliminating the need for separate adjustment mechanisms for each mode.
2Manufacturing precision
If light intensities are optimized for color reading, then color image quality is improved, but black-and-white reading consistency deteriorates
Solution Approach 1:
The patent designs the light intensity adjustment system to serve both color and black-and-white reading operations. The same adjusted light intensities determined for color reading are also applied to black-and-white reading, ensuring that both modes benefit from the optimized color channel settings while maintaining reading consistency across different operational modes.
Solution Approach 2:
The system performs preliminary adjustment using a reference plate that is read before actual imaging operations. This calibration step establishes baseline light intensity settings that are then applied to both color and black-and-white reading modes, ensuring consistency across different reading types while optimizing for color performance.
3Manufacturing precision
If separate light intensity adjustment is performed for color and black-and-white reading, then mode-specific optimization is achieved, but processing time increases
Solution Approach 1:
The patent performs light intensity adjustment in advance by reading a reference plate before actual image reading operations. The adjustment unit determines appropriate light intensities and stores them for subsequent use. This preliminary calibration eliminates the need for real-time adjustment during both color and black-and-white reading operations.
Solution Approach 2:
The stored light intensity settings are universally applied to both color and black-and-white reading operations. The same calibrated intensities determined during the preliminary reference plate reading are reused for both modes, eliminating the need for separate adjustment processes for each reading type and reducing overall processing time.
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 ensures consistent light intensity across color channels, improving image quality by maintaining balanced color ratios and suppressing variations in image density, thereby enhancing the reproducibility of images in both color and black-and-white readings.
Implementation Method 1
a light source that includes a unit irradiating an image with light beams of plural colors determined in advance
Data Source
AI summary
Provided is an image reading device including a light source that includes a unit irradiating an image with light beams of plural colors and adjusting light intensities of the respective light beams of the plural colors, a reading unit that reads the image irradiated with the light beams of the plural colors from the light source, and outputs image information, and an adjustment unit that adjusts, for a case where an image is read in color, the light intensities of the respective light beams of the plural colors so that values of pieces of image information corresponding to the respective colors fall within a range, and adjusts, for a case where an image is read in black and white, the light intensities of the respective light beams of the plural colors so that values of pieces of image information output from the reading unit fall within a range.