Method and apparatus for halftone rendering of a gray scale image using a blue noise mask

  • US 5,726,772 A
  • Filed: 10/06/1995
  • Issued: 03/10/1998
  • Est. Priority Date: 12/04/1990
  • Status: Expired due to Term
First Claim
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1. A machine comprising a computer readable storage device which stores a dither matrix for use in halftoning image information and a comparator responsive to said computer readable storage device, said dither matrix comprising at least one array, said at least one array, when thresholded at a number of levels produces a number of dot profiles, a plurality of said number of dot profiles each having a power spectrum substantially characteristic of a blue noise power spectrum for the level at which such dot profile is produced.

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