Segmented Correction Plates for Image Scanner Shading Accuracy
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Solution Overview
Problem
Existing shading correction techniques for image reading apparatuses face challenges in accurately correcting density unevenness due to warpage and non-uniform fluorescence characteristics of large correction plates, which are prone to environmental changes.
Innovation Solution
A shading correction apparatus using a flat-plate-shaped correction plate with a plane size corresponding to multiple small regions within the image detection area, acquiring correction image signals from each region, and creating a correction image to perform shading correction, while accounting for variations in fluorescence characteristics across multiple plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large correction plate with plane size equal to the image detection region is used, then the correction plate can cover the entire detection area, but the correction plate is likely to warp and fluorescence characteristics become non-uniform
Solution Approach 1:
The image detection region is divided into multiple small regions, and a separate correction plate is used for each small region. This segmentation prevents warpage and maintains uniform fluorescence characteristics in each correction plate, while collectively covering the entire detection area through multiple plates.
2Adaptability or versatility
If a large correction plate is used, then the entire image detection region can be corrected, but the warpage state changes depending on usage environment
Solution Approach 1:
By dividing the detection region into multiple small regions and using separate correction plates for each, the system achieves full coverage while each individual plate maintains stable composition and minimal warpage regardless of environmental changes.
Solution Approach 2:
Each correction plate is optimized for its specific small region, ensuring local quality and stability. The small size of each plate ensures it maintains its physical properties and fluorescence characteristics uniformly across its surface under various usage environments.
3Area of stationary object
If a large correction plate is used, then shading correction can be performed across the entire image, but fluorescence characteristics in the plane are likely to be non-uniform
Solution Approach 1:
The correction process is segmented into multiple small regions, each with its own correction plate. This ensures that fluorescence characteristics remain uniform within each small plate, avoiding the non-uniformity that would occur in a single large plate.
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 allows for accurate shading correction by minimizing warpage and non-uniformity, ensuring consistent performance across different usage environments.
Implementation Method 1
an excitation light source that irradiates an image carrier, which carries image information and includes a fluorescent material, with excitation light... a detection unit that detects fluorescence image on the basis of fluorescent light emitted from the fluorescent material excited by the excitation light
Implementation Method 2
a flat-plate-shaped correction plate that has a wavelength characteristic in which an excitation wavelength band and an emission wavelength band at least partially overlap an excitation wavelength band and an emission wavelength band of the fluorescent material
Data Source
AI summary
A correction plate has the same plane size as a small region obtained by equally dividing an image detection region. In addition, the correction plates whose number is equal to the number of small regions are prepared. In a maintenance mode, a plurality of correction plates are laid in the image detection region such that the entire image detection region is covered with the plurality of correction plates. In this state, scanning is performed and a correction image signal obtained by detecting fluorescent light from the correction plate is output. An acquisition unit of a console acquires a correction image signal and a creation unit creates a correction image on the basis of the correction image signal. A correction unit performs shading correction on the basis of the correction image.