Liquid Discharge Image Correction for Media Expansion Variations
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Solution Overview
Problem
Existing liquid discharge apparatuses struggle to correct images accurately due to varying expansion-and-contraction rates of recording media caused by differences in image forming conditions such as speed and liquid discharge amounts, which conventional techniques like PTL 1 fail to address effectively.
Innovation Solution
A liquid discharge apparatus that includes a first image obtaining unit, a second image generating unit, a correcting unit, and a liquid discharging unit, which generates and corrects image data based on both predetermined figures and read image data to ensure accurate image formation on varying media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image correction techniques (PTL 1) are used, then the correction process is simple, but the correction accuracy is insufficient due to varying expansion-and-contraction rates of recording media
Solution Approach 1:
The patent divides the correction process into multiple stages: first obtaining original image data, then generating corrected image data by detecting expansion-and-contraction rates from read image data, and finally applying corrections. This segmentation allows accurate handling of page-by-page variations while maintaining systematic control.
Solution Approach 2:
The patent performs preliminary detection of expansion-and-contraction rates by reading image data from the recording medium before final image formation. This preliminary action enables pre-correction of image data to compensate for anticipated media deformation, achieving high correction accuracy.
2Measurement precision
If image correction is performed for each page based on read image data, then correction accuracy improves, but processing time increases
Solution Approach 1:
The patent extracts only the necessary correction information (expansion-and-contraction rates) from read image data by detecting predetermined figures or markers. This extraction approach obtains accurate correction parameters without processing entire pages, reducing time loss while maintaining high correction accuracy.
Solution Approach 2:
The patent changes the parameter being measured from entire image content to specific expansion-and-contraction rates derived from predetermined figures. This parameter change enables efficient calculation of correction values without analyzing complete page images, balancing accuracy and processing speed.
3Stability of the object's composition
If expansion-and-contraction rates vary by page, then image quality consistency deteriorates, but correcting each page individually increases system complexity
Solution Approach 1:
The patent creates a universal correction mechanism that handles various page conditions (different expansion-and-contraction rates) through a unified process. The same correction workflow applies to all pages regardless of their specific deformation characteristics, ensuring image quality consistency without requiring separate complex systems for each page type.
Data Source
AI summary
A liquid discharge apparatus according to an aspect of the present disclosure is a liquid discharge apparatus for forming an image on a recording medium, the liquid discharge apparatus including a first image obtaining unit configured to obtain first image data, a second image generating unit configured to generate second image data by adding a predetermined figure to the first image data, a correcting unit configured to generate third image data obtained by correcting, for each of pages, the first image data, based on the second image data and read image data obtained by reading an image formed on the recording medium based on the second image data, and a liquid discharging unit configured to discharge liquid onto the recording medium, based on the third image data.