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Proceedings Paper

Multilevel color halftoning algorithms
Author(s): Victor Ostromoukhov; Patrick Emmel; Nicolas Rudaz; Isaac Amidror; Roger David Hersch
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Paper Abstract

Methods for the halftoning of images on multi-level printing devices such as multi-level inkjet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occurs between the basic levels attainable by printing one, two or several droplets at the same position, artefacts are less visible than in equal resolution bilevel printers. When dithering algorithms are used for the halftoning task, the dither threshold tiles should have oblique orientations so as to make the halftoning artifacts less visible. They should be designed so as to break up the inherent artifacts of variable dot size printers, such as for example continuous lines made up of elongated elliptic dots. Error-diffusion in color space is also appropriate for multi-level halftoning. Visual artifacts can be reduced by introducing dot over dot color inhibiting constraints.

Paper Details

Date Published: 7 February 1997
PDF: 9 pages
Proc. SPIE 2949, Imaging Sciences and Display Technologies, (7 February 1997); doi: 10.1117/12.266337
Show Author Affiliations
Victor Ostromoukhov, Swiss Federal Institute of Technology (Canada)
Patrick Emmel, Swiss Federal Institute of Technology (Switzerland)
Nicolas Rudaz, Swiss Federal Institute of Technology (Switzerland)
Isaac Amidror, Swiss Federal Institute of Technology (Switzerland)
Roger David Hersch, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 2949:
Imaging Sciences and Display Technologies
Jan Bares; Christopher T. Bartlett; Paul A. Delabastita; Jose Luis Encarnacao; Nelson V. Tabiryan; Panos E. Trahanias; Arthur Robert Weeks, Editor(s)

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