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

  • US 5,111,310 A
  • Filed: 12/04/1990
  • Issued: 05/05/1992
  • Est. Priority Date: 12/04/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for the halftoning of gray scale images by utilizing a pixel-by-pixel comparison of the image against a blue noise mask in which the blue noise mask is comprised of a random non-deterministic, non-white noise single valued function which is designed to produce visually pleasing dot profiles when thresholded at any level of said gray scale images.

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