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Ranked dither for high-quality robust printing.
1Department of Electrical Engineering, University of Washington, Seattle, Washington 98103, USA. gupta@ee.washington.edu
Summary
A new parallelized halftoning method robustly handles dot loss in printing. It uses ranked dither thresholds for complex image areas, improving print quality for xerographic and high-resolution applications.
Area of Science:
- Digital imaging and printing technologies.
- Image processing and computer graphics.
Background:
- Dot loss is a common issue in xerographic and high-resolution printing, degrading image quality.
- Existing halftoning methods can be sensitive to such imperfections.
Purpose of the Study:
- To propose a novel parallelized halftoning method resilient to dot loss.
- To evaluate the performance of this new method against established techniques.
Main Methods:
- A hybrid approach combining clustered-dot dither for smooth regions and ranked dither thresholds for high-activity areas.
- Experimental comparison with standard dither, error diffusion, and green-noise error diffusion.
- Utilizing standard clustered-dot dither masks for four-color printing (CMYK).
Main Results:
- The proposed ranked dither method demonstrates robustness against dot loss.
- Effective halftoning of image blocks with high spatial activity.
- Performance comparable or superior to other methods in four-color printing scenarios.
Conclusions:
- The developed parallelized halftoning technique offers a significant improvement in print robustness.
- Ranked dither is a viable strategy for enhancing halftoning in challenging printing conditions.
- This method is suitable for applications requiring high-quality, dot-loss-tolerant printing.
