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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 19, Iss. 10 — Oct. 1, 2002
  • pp: 1969–1982

Multilevel screen design using direct binary search

Guo-Yau Lin and Jan P. Allebach  »View Author Affiliations


JOSA A, Vol. 19, Issue 10, pp. 1969-1982 (2002)
http://dx.doi.org/10.1364/JOSAA.19.001969


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Abstract

Screening is an efficient halftoning algorithm that is easy to implement. With multilevel devices, there is a potential to improve the overall image quality by using multilevel screening, which allows us to choose among multiple native tones at each addressable pixel. We propose a methodology for multilevel screen design using direct binary search (DBS). We refer to one period of the screen as a multitone cell. We define a multitone schedule, which for each absorptance level specifies the fraction of each native tone used in the multitone cell. Traditional multitoning uses only one native tone in smooth areas corresponding to absorptance values near the native tones, an approach that introduces contouring artifacts. To reduce contouring, we employ schedules that use more than one native tone at each absorptance level. On the basis of the multitone schedule, multitone patterns are designed level by level by adding native tones under the stacking constraint. At each level the spatial arrangement of the native tones is determined by a modified DBS search. We explore several different multitone schedules that illustrate the image-quality trade-offs in multitone screen design.

© 2002 Optical Society of America

OCIS Codes
(100.0100) Image processing : Image processing
(100.2810) Image processing : Halftone image reproduction

History
Original Manuscript: November 20, 2001
Revised Manuscript: May 16, 2002
Manuscript Accepted: May 16, 2002
Published: October 1, 2002

Citation
Guo-Yau Lin and Jan P. Allebach, "Multilevel screen design using direct binary search," J. Opt. Soc. Am. A 19, 1969-1982 (2002)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-19-10-1969

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