Inkjet Dot Arrangement Patterns Suppress Joint Streaks
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Solution Overview
Problem
Ink jet printing technologies face issues with joint streaks and texture or feeling of granularity at the boundary parts due to adjustments in thinning ratios, which can make joint streaks more conspicuous despite attempts to minimize them.
Innovation Solution
An ink jet printing apparatus and method that utilize specific dot arrangement patterns for each gradation level and position on the printing medium, adjusting the number and position of dots to prioritize low frequency components over high frequency components at joint parts, thereby reducing the visibility of joint streaks and texture or granularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thinning ratio at the boundary part is adjusted in accordance with the gradation to reduce joint streaks, then the joint streak becomes less conspicuous, but the dot arrangement state at the joint part differs from other regions causing texture or granularity to occur and making the joint streak more conspicuous
Solution Approach 1:
The patent applies local quality by preparing multiple dot arrangement patterns (first through fourth patterns) with different dot numbers and arrangements for different regions. Specifically, different dot arrangement patterns are selected for joint parts versus non-joint parts based on position information, allowing each region to have optimized dot characteristics. This resolves the contradiction by enabling local optimization at joint boundaries while maintaining appropriate dot arrangement in other regions.
Solution Approach 2:
The patent changes parameters by selecting from multiple pre-prepared dot arrangement patterns that have different dot numbers, positions, and arrangements. The selection is based on position information (whether the pixel is at a joint part or not) and gradation level. This parameter change approach allows the system to switch between different dot arrangement configurations to optimize both joint streak reduction and dot arrangement uniformity in different regions.
2Object-affected harmful factors
If the dot arrangement pattern at the joint part is made different from other regions to reduce joint streaks, then the joint streak visibility is reduced, but the texture or feeling of granularity inherent in the joint part occurs
Solution Approach 1:
The patent applies local quality by preparing multiple dot arrangement patterns (first through fourth patterns) with different dot numbers and arrangements for different regions. Specifically, different dot arrangement patterns are selected for joint parts versus non-joint parts based on position information, allowing each region to have optimized dot characteristics. This resolves the contradiction by enabling local optimization at joint boundaries while maintaining appropriate dot arrangement in other regions.
Solution Approach 2:
The patent changes parameters by selecting from multiple pre-prepared dot arrangement patterns that have different dot numbers, positions, and arrangements. The selection is based on position information (whether the pixel is at a joint part or not) and gradation level. This parameter change approach allows the system to switch between different dot arrangement configurations to optimize both joint streak reduction and dot arrangement uniformity in different regions.
Data Source
AI summary
An ink jet printing apparatus and an ink jet printing method capable of suppressing the occurrence of the texture or the feeling of granularity at a joint part even in the case where a thinning ratio in a boundary region is adjusted in order to reduce a joint streak are provided. To achieve such purposes, one dot arrangement pattern is set from a plurality of dot arrangement patterns for each pixel in accordance with a gradation level and a position on a printing medium. At this time, in a pixel region located at the joint part, a second dot arrangement pattern whose number of dots is different from a first dot arrangement pattern, which is set in the pixel region located at a part other than the joint part, is arranged so that low frequency components are less than high frequency components.