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Halftone moiré due to imager distortion

[+] Author Affiliations
Orhan Bulan

University of Rochester, Department of Electrical and Computer Engineering, School of Engineering and Applied Science, Rochester, New York 14627-0126

Robert Loce

Xerox Research Center Webster, Webster, New York 14580

Beilei Xu

Xerox Research Center Webster, Webster, New York 14580

J. Electron. Imaging. 20(1), 013008 (February 22, 2011). doi:10.1117/1.3537830
History: Received July 27, 2010; Revised December 14, 2010; Accepted December 16, 2010; Published February 22, 2011; Online February 22, 2011
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Moiré in color printing is an undesirable visible artifact that can arise from overlaying multiple halftone color separations. Halftone geometric configurations designed to avoid moiré in the overlays strictly require that individual halftone color separations must possess a low degree of relative distortion. However, optical and mechanical errors of multiple imaging systems within a printer usually produce differences between the color planes in the trajectory and placement of the exposure spots. We study color halftone moiré due to these optical and mechanical errors for otherwise moiré-free halftone configurations. Distortions due to commonly used imaging systems in xerography (i.e., raster output scanners and image bars) are categorized into two classes that depend on the direction of the displacement errors [i.e., process direction distortions (such as shear, bow, and skew) and cross-process direction distortions (such as scanline magnification, magnification imbalance, and high-order scanline distortions)]. Using frequency vector representation of color halftones, we derive analytical expressions for acceptability bounds on these distortions. We evaluate the analytical expressions for a classical halftone screen configuration and a minimum rosette geometry to enable specification allocations for different imaging components in the design of an imaging system.

© 2011 SPIE and IS&T

Citation

Orhan Bulan ; Robert Loce and Beilei Xu
"Halftone moiré due to imager distortion", J. Electron. Imaging. 20(1), 013008 (February 22, 2011). ; http://dx.doi.org/10.1117/1.3537830


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