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Multilevel screen design using direct binary search.

Guo-Yau Lin1, Jan P Allebach

  • 1School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907-1285, USA. lin8@ecn.purdue.edu

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|October 9, 2002
PubMed
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Multilevel screening enhances image quality by using multiple native tones per pixel. This new method reduces contouring artifacts common in traditional screening, improving visual fidelity in digital halftoning.

Area of Science:

  • Digital imaging
  • Computer graphics
  • Image processing

Background:

  • Screening is an efficient halftoning algorithm.
  • Multilevel devices offer potential for improved image quality.
  • Traditional multitoning can introduce contouring artifacts in smooth areas.

Purpose of the Study:

  • To propose a methodology for multilevel screen design.
  • To reduce contouring artifacts in digital halftoning.
  • To explore image-quality trade-offs in multitone screen design.

Main Methods:

  • Utilizing direct binary search (DBS) for multilevel screen design.
  • Defining a multitone schedule specifying native tone fractions for each absorptance level.
  • Designing multitone patterns level by level under a stacking constraint using a modified DBS search.

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Main Results:

  • Developed a novel methodology for multilevel screen design.
  • Demonstrated reduction of contouring artifacts by using multiple native tones.
  • Illustrated image-quality trade-offs associated with different multitone schedules.

Conclusions:

  • Multilevel screening with optimized schedules can significantly improve image quality.
  • The proposed DBS-based methodology provides an effective approach to designing multitone screens.
  • Further exploration of multitone schedules is valuable for balancing image quality and implementation complexity.