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Error diffusion halftoning system

  • US 7,417,771 B2
  • Filed: 06/26/2001
  • Issued: 08/26/2008
  • Est. Priority Date: 06/26/2001
  • Status: Expired due to Term
First Claim
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1. A method of selecting an intensity threshold in a halftoning system used to render respective pixels of an image on a display, said halftoning system providing respective accumulated errors, each based on at least one respective variance between a rendered intensity of a pixel and a quantized measured intensity of a corresponding pixel of a contone image to be displayed, each respective accumulated error subject to recalculation pixel-by-pixel, said method comprising the steps of:

  • (a) selecting a first predetermined intensity threshold if either one of said accumulated errors of a current pixel and a neighboring pixel exceeds a first error threshold;

    (b) selecting a second predetermined intensity threshold if said accumulated error of a pixel remotely neighboring said current pixel exceeds a second error threshold and said first predetermined intensity threshold is not selected;

    (c) selecting a third predetermined intensity threshold if neither of said first and said second intensity thresholds are selected; and

    (d) rendering a pixel of said image on a display based upon said selected predetermined intensity threshold.

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