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Suppressing sampling moiré by least-squares prefiltering in color printing

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Moiré patterns are undesirable artifacts in printing applications. Sampling moiré is caused by aliasing due to image resampling from one lattice to another. In color printing each color separation uses its own halftone lattice. Therefore, moiré patterns 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 fairly simple (e.g., bilinear interpolation). Additionally, high-resolution images become everyday fare which increases the chance of highfrequency components and so moiré patterns. Approaches such as simple low-pass filtering unacceptably blurs the edges, while manual smoothing by an operator is very time-consuming.

This paper proposes an optimal prefilter which is based on a least-squares resampling technique. Such an approach requires a suitable discrete/continuous model and computes the reconstruction function which minimizes the error between the continuous representations of the images on the source and target lattice. The reconstruction function jointly takes into account the Nyquist areas of the color separations and can be used as an optimal prefilter before halftoning. Experimental results show that after prefiltering, the images are much less prone to moiré and look as sharp as without prefiltering.
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Document Type: Research Article

Publication date: January 1, 2002

More about this publication?
  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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