Image Processing Apparatus Orthogonal Screen Angle Character Outline
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Solution Overview
Problem
Existing image processing techniques fail to effectively suppress jagged edges (jaggies) in character outlines with various angles, as they often rely on a single screen angle that does not account for the diverse orientations of line segments on a page.
Innovation Solution
An image processing method that performs first and second screen processing using different screen angles on line and outline regions, respectively, and composites the results to reduce jagged edges, with the second screen angle being orthogonal to the first, thereby addressing the issue of jagged edges in character outlines with various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If screen processing is performed using a single screen angle, then the processing is simple and fast, but jagged edges appear in character outlines with various angles
Solution Approach 1:
The patent divides the screen processing into two separate processing stages: first screen processing with a first screen angle and second screen processing with a second screen angle (orthogonal to the first). This segmentation allows each processing stage to target specific orientation requirements, reducing jagged edges in character outlines while maintaining processing efficiency.
Solution Approach 2:
The patent implements nested processing by performing second screen processing on the results of first screen processing. The outline regions identified in the first processing are then subjected to additional screen processing with a different screen angle, creating a nested structure where processing operations are applied hierarchically to achieve superior outline quality.
2Device complexity
If screen processing is performed using a single screen angle, then the device complexity is low, but jagged edges appear in character outlines with various angles
Solution Approach 1:
The processing system is segmented into two distinct screen processing units, each using a different screen angle. The first screen processing unit handles general screen processing, while the second screen processing unit specifically addresses outline regions with orthogonal screen angle, reducing system complexity while improving outline quality.
Solution Approach 2:
The patent applies different screen angles to different regions: the first screen angle is used for general processing, while the second orthogonal screen angle is specifically applied to outline regions. This local differentiation ensures high-quality character outlines without requiring complete system redesign.
3Ease of operation
If a single screen angle is used for all characters on a page, then the processing is uniform and simple, but jaggies are not reduced in line segments with angles different from the predetermined angle
Solution Approach 1:
The patent implements local quality by applying different screen angles to different regions and orientations. The first screen processing uses a first screen angle for uniform processing, while the second screen processing uses an orthogonal screen angle specifically for outline regions, ensuring high quality across line segments with various angles while maintaining operational simplicity.
Data Source
AI summary
An image processing apparatus includes a first screen processing unit that performs first screen processing using a first screen angle on a line region of a character, a second screen processing unit that performs second screen processing using a second screen angle on at least an outline region out of the line region, the second screen angle being different from the first screen angle, and a composition unit that performs composition of a processing result of the first screen processing and a processing result of the second screen processing, on at least the outline region out of the line region.