Ink Jet Printer Edge Processing Parameter Optimization
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Solution Overview
Problem
Ink jet printing faces issues with ink bleeding at edge pixels, leading to blurred images or partially printed characters due to excessive ink reduction, and insufficient reduction causing ink bleeding, which affects the overall quality of printed images.
Innovation Solution
An ink jet printer method that involves printing two images with different edge pixel ratios and average densities, determining a processing parameter to match the printing average densities of both images, and storing this parameter to ensure appropriate ink distribution and prevent excessive or insufficient ink reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ink amount is reduced at edge pixels to suppress ink bleeding, then ink bleeding is reduced, but printing average density decreases causing partially printed characters or deficiently thin lines
Solution Approach 1:
The patent changes the processing parameter (edge processing strength) to find an optimal value where the printing average density of the first image with edge processing matches that of the second image without edge processing. This parameter optimization resolves the contradiction by preventing both ink bleeding and insufficient printing density.
Solution Approach 2:
The patent employs feedback by measuring the printing average density of test images and using this information to determine the appropriate edge processing parameter. The system adjusts the processing based on the measured density to achieve the desired balance between preventing ink bleeding and maintaining printing quality.
2Measurement precision
If ink amount is reduced at edge pixels, then edge sharpness improves, but line thickness decreases causing blurred characters or thin lines
Solution Approach 1:
The patent optimizes the edge processing parameter to achieve the right balance between edge sharpness and line thickness. By matching printing average densities, the system determines the appropriate processing strength that maintains both edge definition and adequate line thickness.
3Object-affected harmful factors
If pre-print processing reduces ink amount in specific parts, then ink bleeding is suppressed, but printing quality deteriorates due to excessively small ink amount
Solution Approach 1:
The patent uses feedback from density measurements of printed test images to determine the appropriate pre-print processing parameter. This ensures that ink bleeding is suppressed while maintaining adequate ink amounts for high-quality printing.
Solution Approach 2:
The patent adjusts the pre-print processing parameter to an optimal value that prevents ink bleeding while preserving printing quality. The parameter is determined by matching printing average densities between processed and unprocessed images.
Data Source
AI summary
A technique includes printing a first image including a plurality of edge pixels and a second image with a lower ratio of edges pixels than the first image and an average density equal to that of the first image and determining a value of a processing parameter so that the average densities of the first image and the second image match. The technique is configured to realize appropriate pre-print processing while preventing the average densities from being low due to the excessive pre-print processing or being high due to the insufficient pre-print processing.