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Suppression of Sampling Moire in Color Printing by Spline-Based Least-Squares Prefiltering

D. Van De Ville, W. Philips, I. Lemahieu, R. Van de Walle

Pattern Recognition Letters, vol. 24, no. 11, pp. 1787-1794, July 2003.


Many image processing systems, including those for printing applications, need sampling conversions for the representation of an image from one lattice to another. For example in the case of printing, classical halftoning requires new sample values on the halftone lattice. Although often considered as a straightforward procedure, resampling can cause so-called sampling moire due to aliasing. These artifacts are often very noticeable and as such undesirable, in particular for high-quality printing. In color printing, each color separation uses its own halftone lattice. Therefore, moire patterns will not only display an unexpected new frequency and orientation, but also influence the color appearance itself. These artifacts are frequently encountered in commercial (even high-quality) printing since the interpolation algorithms used in RIPs are simple (e.g., bilinear interpolation) and do not take into account the nature of the target lattice. Approaches such as simple low-pass filtering unacceptably blur the edges, while manual selective smoothing by an operator is very time-consuming.

This paper proposes an optimal prefilter which is based on the least-squares linear resampling paradigm. Our approach requires proper discrete/continuous models, i.e., for both the source and the target lattices, and computes the associated reconstruction function which minimizes the error between the representations in the continuous domain. The reconstruction function jointly takes into account the Nyquist areas of every color separation using a novel hexagonal spline model resulting into an optimal prefilter before halftoning. Experimental results show that after prefiltering, the images are much less prone to moire while not suffering from noticeable edge blurring.

@ARTICLE(http://bigwww.epfl.ch/publications/vandeville0302.html,
AUTHOR="Van De Ville, D. and Philips, W. and Lemahieu, I. and Van de
	Walle, R.",
TITLE="Suppression of Sampling Moire in Color Printing by
	Spline-Based Least-Squares Prefiltering",
JOURNAL="Pattern Recognition Letters",
YEAR="2003",
volume="24",
number="11",
pages="1787--1794",
month="July",
note="")

© 2003 Elsevier Science B.V.. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from Elsevier Science B.V.. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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