Thin Line Rendering Endpoint Displacement for Thickness Uniformity
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Solution Overview
Problem
The PostScript Edge system for rendering thin lines results in inconsistent line thickness, particularly for lines inclined at 45 or 135 degrees, leading to noticeable differences in thickness when passing through or not passing through grid points, causing uneven rendering of lines and curves.
Innovation Solution
An image processing apparatus and method that extracts thin lines with a width of equal to or less than a predetermined value and displaces at least one end point of the line within a predetermined range if it satisfies specific conditions, ensuring uniform thickness by adjusting the end points to avoid grid points, thereby maintaining consistent line width regardless of inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the PostScript Edge system is used to render thin lines, then rendering effectiveness is improved, but line thickness uniformity deteriorates
Solution Approach 1:
The patent changes the rendering parameter by selectively applying different rendering rules based on line characteristics. For thin lines with 45-degree or 135-degree inclination that pass through grid points, a special rendering rule is applied to ensure uniform thickness, while other lines use the standard PostScript Edge rendering. This parameter-based differentiation resolves the thickness uniformity issue while maintaining rendering effectiveness.
2Manufacturing precision
If determination processes are added to fix line thickness, then line thickness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by making the rendering process adaptive to local line characteristics. Instead of uniformly applying complex determination processes to all lines, the system only applies additional processing to specific line segments that meet certain criteria (thin lines with 45-degree or 135-degree inclination passing through grid points). This localized approach maintains line thickness uniformity while minimizing the increase in processing complexity.
3Ease of operation
If conventional rendering methods are used, then ease of operation is maintained, but line thickness consistency deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-identifying line segments that require special processing. The system determines in advance which lines are thin lines with 45-degree or 135-degree inclination that pass through grid points, and applies appropriate rendering rules to these identified segments. This preliminary identification and classification enables consistent line thickness while maintaining operational simplicity, as the complex processing is automatically applied only where needed.
Data Source
AI summary
An image processing apparatus has an extraction unit configured to extract a thin line with a width of equal to or less than a predetermined value from rendering data, and an end point processing unit configured to displace, with respect to a portion that satisfies a predetermined condition in the thin line, at least one of end points of the portion within a predetermined range.