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Proceedings Paper

Halftone blending between smooth and detail screens to improve print quality with electrophotographic printers
Author(s): Seong Jun Park; Mark Shaw; George Kerby; Terry Nelson; Di-Yuan Tzeng; Victor Loewen; Kurt Bengtson; Jan P. Allebach
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Paper Abstract

In this paper, we consider a dual-mode halftoning process for the electrophotographic laser printer - a low frequency halftoning for smooth regions and a high frequency halftoning for detail regions. These regions are described by an object map that is extracted from the page description language (PDL) version of the document. This manner of switching screens depending on the local content provides a stable halftone without artifacts in smooth areas and preserves detail rendering in detail or texture areas. However, when switching between halftones with two different frequencies, jaggies may occur along the boundaries between areas halftoned with low and high frequency screens. To reduce the jaggies, our screens obey a harmonic relationship. In addition, we implement a blending process based on a transition region. We propose a nonlinear blending process in which at each pixel, we choose the maximum of the two weighted halftones where the weights vary according to the position in the transition region. Moreover, we describe an on-line tone-mapping for the boundary blending process, based on an off-line calibration procedure that effectively assures the desired tone values within the transition region.

Paper Details

Date Published: 24 January 2012
PDF: 12 pages
Proc. SPIE 8292, Color Imaging XVII: Displaying, Processing, Hardcopy, and Applications, 829210 (24 January 2012); doi: 10.1117/12.913948
Show Author Affiliations
Seong Jun Park, Purdue Univ. (United States)
Mark Shaw, Hewlett-Packard Co. (United States)
George Kerby, Hewlett-Packard Co. (United States)
Terry Nelson, Hewlett-Packard Co. (United States)
Di-Yuan Tzeng, Hewlett-Packard Co. (United States)
Victor Loewen, Hewlett-Packard Co. (United States)
Kurt Bengtson, Hewlett-Packard Co. (United States)
Jan P. Allebach, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 8292:
Color Imaging XVII: Displaying, Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu; Alessandro Rizzi, Editor(s)

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