Image Reading Device Color Correction Adjustment
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Solution Overview
Problem
Conventional image reading devices face challenges in maintaining proper color correction due to variations in the density of the reference whiteboard and the distance between the reading unit and the whiteboard, which affect the output level, and existing technologies cannot correct these variations at the input side of the color-correction circuit.
Innovation Solution
An image reading device with a reading unit that includes an optical unit, a converting unit, an adjusting unit, and a color correction unit, where correction coefficients are generated before installation to ensure a predetermined output level, and then adjusted without the color-correction process, allowing for proper color correction despite changes in installation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If correction coefficients are set before installation, then color correction can be performed, but output level variations occur due to differences in reference whiteboard density and distance
Solution Approach 1:
The patent applies preliminary action by pre-setting correction coefficients during the manufacturing phase before installation. These coefficients are calculated based on predetermined reference conditions (reference whiteboard density and distance) to enable color correction functionality. However, this preliminary setting creates a contradiction because actual installation conditions may differ from the predetermined references, causing output level variations.
Solution Approach 2:
The patent implements dynamics by enabling the correction coefficients to be dynamically adjusted after installation. The system allows users to modify the coefficients based on actual installation conditions (different reference whiteboard densities and distances), transforming the static pre-set values into adaptive parameters that maintain both color correction accuracy and output level stability across varying conditions.
2Ease of manufacture
If reading unit and image reading device are produced separately, then ease of installation is improved, but output level consistency deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the system into separate components: the reading unit (with optical unit and converting unit) and the image reading device. This modular design enables independent production and flexible installation, allowing the reading unit to be manufactured and tested separately before integration into the image reading device.
Solution Approach 2:
The patent implements parameter changes by allowing adjustment of correction coefficients after installation to compensate for variations between separately produced components. The system enables modification of optical and electrical parameters (correction coefficients) to maintain output level consistency despite differences in manufacturing conditions and assembly variations between the reading unit and image reading device.
3Reliability
If correction coefficients are adjusted after installation, then output level stability is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling users to independently adjust correction coefficients without requiring complex automated calibration systems. The adjustment mechanism is designed to be user-friendly, allowing operators to modify coefficients based on observed output levels and installation conditions, thereby achieving stability without introducing significant complexity.
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
Enables proper color correction and stable output levels by recalculating correction coefficients after installation, ensuring consistent image data quality even when the reading unit and image reading device are produced separately.
Implementation Method 1
an optical unit that irradiates the original document with a light, and receives a reflected light from the original document
Data Source
AI summary
An adjusting unit adjusts an output level of digital data converted from image data, based on a correction coefficient for each color. A color correction unit performs a color-correction process of correcting a fluctuation of adjusted output level based on a color-correction parameter that differs from one image reading device to another. The correction coefficient is generated before a reading unit is installed in the image reading device such that the output level becomes a predetermined value when reading the original document without the color-correction process, and then adjusted without the color-correction process at a time of installing the reading unit.