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Abstract

This paper examines the possibilities of improving halftoning techniques using dispersed dots. This corresponds to finding micro-dot distributions that approximate the intensity levels that have to be rendered. A widely used halftoning method is ordered dithering, which uses a threshold matrix to decide if a micro-dot should be set in the output image. A way to generate improved threshold matrices for ordered dithering will be introduced that avoids unwanted low-frequency portions without introducing too much random noise into the rendered image. Since the presented method produces images of high quality it is ideally suited for output generation in high-end image processing systems.

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@techreport{Purgathofer-1994-FRD,
  title =      "Forced Random Dithering: Improved Threshold
                Matrices for Ordered Dithering",
  author =     "Werner Purgathofer and Robert F. Tobler and Manfred Geiler",
  year =       "1994",
  abstract =   "This paper examines the possibilities of improving
               halftoning techniques using dispersed dots. This corresponds
               to finding micro-dot distributions that approximate the
               intensity levels that have to be rendered. A widely used
               halftoning method is ordered dithering, which uses a
               threshold matrix to decide if a micro-dot should be set in
               the output image. A way to generate improved threshold
               matrices for ordered dithering will be introduced that
               avoids unwanted low-frequency portions without introducing
               too much random noise into the rendered image. Since the
               presented method produces images of high quality it is
               ideally suited for output generation in high-end            
                   image processing systems.",
  address =    "Favoritenstrasse 9-11/186, A-1040 Vienna, Austria",
  institution = "Institute of Computer Graphics and Algorithms, Vienna
               University of Technology",
  note =       "human contact: technical-report@cg.tuwien.ac.at",
  month =      nov,
  number =     "TR-186-2-94-15",
  keywords =   "digital halftoning, ordered dithering, threshold matrix",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/1994/Purgathofer-1994-FRD/",
}