Aperiodic Dot Arrangement Patterns for Inkjet Binarization Texture Reduction
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Solution Overview
Problem
Existing binarization processes using dot arrangement patterns in ink-jet printing often result in deviations of formed dots, leading to texture or granular feelings in printed images due to inadequate dispersion of dot arrangement patterns across different levels.
Innovation Solution
A data processing apparatus and method that select dot arrangement patterns based on aperiodic expansion patterns with fewer low-frequency components than high-frequency components, ensuring highly dispersed dot data formation to reduce texture and granular feelings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If periodic or pseudo-random expansion patterns are used to arrange dot arrangement patterns, then data processing and transfer time are reduced, but dot deviation occurs resulting in texture or granular feelings in printed images
Solution Approach 1:
The patent changes the fundamental parameter of pattern arrangement from periodic or pseudo-random to aperiodic. This parameter change resolves the contradiction by eliminating the regularity that causes dot deviation and texture, while still maintaining the reduced resolution benefit for faster data processing. The aperiodic arrangement ensures that dots do not align in predictable patterns that would manifest as texture or granular feelings.
Solution Approach 2:
The patent introduces asymmetry in the arrangement of dot patterns across different gray levels. Instead of using symmetric or regular periodic patterns, the invention employs asymmetric aperiodic arrangements where the position and configuration of dots vary irregularly. This asymmetry prevents the formation of regular textures and granular feelings while maintaining efficient data compression.
2Quantity of substance
If dot arrangement patterns are used for binarization at low resolution, then memory capacity is reduced, but dot deviation and texture appearance occur
Solution Approach 1:
The patent changes the arrangement parameter from periodic to aperiodic, which resolves the contradiction between reduced memory usage and maintained dot formation accuracy. The aperiodic arrangement prevents the systematic errors that would otherwise manifest as texture or granular feelings, allowing low-resolution pattern expansion to achieve both memory efficiency and accurate dot formation.
3Manufacturing precision
If multiple dot arrangement patterns are selected based on pixel position, then binarization quality is improved, but complexity of pattern selection and arrangement increases
Solution Approach 1:
The patent simplifies the complexity issue by changing from periodic to aperiodic arrangement. This parameter change reduces the computational burden of pattern selection because aperiodic patterns do not require complex tracking of repeating sequences or synchronization across different regions of the image, while still providing high binarization quality through the irregular dispersion of dots.
Data Source
AI summary
A data processing apparatus uses a pattern table arranging binarizing patterns correspondingly to positions of a pixel, each of which is used for a binarization process in which an arrangement of a number of dots depending on a value of multi-valued image data corresponding to the pixel is determined, to select the binarizing pattern depending on the position of the pixel and on the value of multi-valued image data corresponding to the pixel for executing the binarization process. The pattern table corresponding to one of the values to be taken by the multi-valued image data includes a plurality of types of binarizing patterns which determine different arrangements of dots from each other. The arrangement of each of the plurality of types of binarizing patterns in the pattern table corresponding to the one value has a characteristic that the arrangement is aperiodic and that low frequency components are fewer than high frequency components.