Halftone Mask Dot Pattern Continuity and Stacking Elimination
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Solution Overview
Problem
Existing halftone mask manufacturing methods face limitations in securing continuity of dot patterns between gradations, leading to suboptimal image quality due to stacking limitations and independent optimization of dot arrangements without considering continuity.
Innovation Solution
A halftone mask manufacturing method that determines dot patterns by adjusting the number of dots and replacing them with non-dot arrangements based on gradation differences, ensuring continuity and improving image quality by partially maintaining stacking limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dot patterns are independently optimized at each density through error diffusion method, then image quality is improved, but continuity of dot patterns between densities is lost due to stacking limitations
Solution Approach 1:
The patent applies preliminary action by pre-determining dot patterns at specific reference densities before interpolating to intermediate densities. This ensures that the base dot patterns are optimized for image quality while maintaining a structured framework that allows continuous transition between densities through controlled interpolation of dot positions and densities.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying dot density and position parameters across different density levels. By treating dot patterns as parametric structures that can be continuously adjusted, the method maintains continuity while allowing optimization at each density level through controlled parameter transitions rather than independent optimization.
2Reliability
If dot patterns are independently optimized at each density, then stacking limitations are eliminated, but continuity and smooth transition between densities deteriorates
Solution Approach 1:
The patent establishes preliminary dot patterns at key density levels that serve as anchors for subsequent interpolation. This preliminary structuring eliminates stacking limitations at reference points while providing a stable framework that ensures smooth transitions between densities through systematic parameter interpolation, preventing abrupt changes in dot arrangements.
Solution Approach 2:
The patent implements continuity of useful action by establishing a continuous parameter space for dot patterns that allows smooth interpolation between density levels. Rather than treating each density as independent, the method maintains continuous variation in dot position and density parameters, ensuring that transitions between densities are smooth and visually coherent while still eliminating stacking artifacts through optimized reference patterns.
3Productivity
If dither method is used for high speed processing, then processing speed is improved, but image quality deteriorates due to stacking limitations
Solution Approach 1:
The patent applies preliminary action by pre-computing and storing optimized dot patterns at various density levels before actual halftoning operations. This allows the processing system to quickly retrieve and interpolate between pre-optimized patterns rather than performing complex optimization in real-time, thereby maintaining high processing speed while achieving superior image quality that eliminates dither method stacking limitations.
Solution Approach 2:
The patent utilizes parameter changes by representing dot patterns as parametric structures that can be efficiently interpolated between pre-computed reference states. This approach maintains the computational efficiency needed for high-speed processing while achieving image quality superior to traditional dither methods by systematically optimizing dot arrangements across the full density range through controlled parameter transitions.
Data Source
AI summary
A temporary dot pattern at a dot pattern determining target gradation is determined by adding or removing dots as much as the number of dots corresponding to a gradation difference to or from a dot pattern at a gradation at which a dot pattern is already determined, and a dot pattern at a dot pattern determining target gradation is determined by performing a replacement process of replacing dots including some of dots at a dot pattern determined gradation among the dots in the temporary dot pattern with non-dot arrangements. A halftone mask may be constituted by a group of dot patterns at each gradation, or the halftone mask may be constituted by setting a dot pattern for each gradation as a threshold value.