Inkjet Image Processing Quantization for Surface Tension Management
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Solution Overview
Problem
Inkjet printing technologies face challenges in maintaining high-density and excellent coloring properties when using inks with high surface tension, as they tend to penetrate deeply into the print medium, leading to decreased image quality and rub-fastness due to overlapping with inks of lower surface tension.
Innovation Solution
An image processing method that quantizes gradation values for each ink, minimizing the overlap of inks with high surface tension by adjusting quantization thresholds and offset values, ensuring that inks with high surface tension are printed with minimal overlap with other inks, thereby maintaining image density and coloring quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pigment ink with high surface tension is used to achieve excellent coloring property, then coloring property is improved, but rub-fastness deteriorates due to deep penetration into print medium
Solution Approach 1:
The patent applies preliminary action by performing quantization processing for the first color (pigment ink) before processing for the second color (dye ink). The threshold matrix for the first color is established in advance, and the second color's threshold is offset based on the first color's gradation values. This sequential approach ensures that pigment ink dots are positioned optimally before dye ink is applied, preventing deep penetration and improving rub-fastness while maintaining coloring property.
2Adaptability or versatility
If black ink with high surface tension is printed to overlap color ink with low surface tension, then both colors can be printed, but density and coloring property of black ink decrease due to promoted penetration
Solution Approach 1:
The patent processes black ink (first color) before color inks (second and third colors) through quantization processing. By establishing the black ink threshold matrix first and offsetting subsequent color thresholds based on black ink gradation values, the system ensures black ink dots are firmly positioned before color inks are applied, preventing penetration and maintaining high density and coloring property.
Solution Approach 2:
The patent applies local quality by using different threshold offset strategies for different color combinations. The threshold offset amount is calculated based on the specific gradation values of previously processed colors, allowing localized adjustment of quantization thresholds for each pixel position. This ensures that black ink maintains its density and coloring property in regions where it overlaps with color inks, while still achieving multi-color printing capability.
3Reliability
If inter-color processing is used to minimize overlapping of first and second colors, then rub-fastness is improved, but overlapping with additional color inks still occurs causing density decrease
Solution Approach 1:
The patent extends preliminary action to handle three or more colors by sequentially processing each color and accumulating threshold offset amounts. The first color (black ink) is processed first, then the second color (cyan) is processed with offset based on the first color, and the third color (magenta) is processed with offset based on the accumulated gradation values of previous colors. This ensures that each subsequent color is positioned to minimize overlapping with all previously processed colors, maintaining both rub-fastness and image density.
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
The method effectively enhances image density and coloring properties by reducing the penetration of high surface tension inks, preventing a decrease in image quality and ensuring better rub-fastness.
Implementation Method 1
surface tension of the first coloring material is higher than surface tension of the second coloring material and a third coloring material
Data Source
AI summary
An image is printed by using a first, second and third ink. A surface tension difference between a first ink and a third ink is smaller than a surface tension difference between the first ink and a second ink. A first gradation value for the first ink, a second gradation value for the second ink and a third gradation value for the third ink are quantized to generate a first quantized value, a second quantized value, and a third quantized value respectively. This quantization processing is performed such that, the number of pixels for each of which the first quantized value indicates printing, a the second quantized value indicates non-printing and the third quantized value indicates non-printing is greater than the number of pixels for each of which the first quantized value indicates printing and at least the second quantized value indicates printing or the third quantized value indicates printing.