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Journal of Electronic Imaging

Halftoning with random correlated noise
Author(s): Robert J. Rolleston; Simon J. Cohen
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Paper Abstract

The process of digital halftoning replaces a visually continuous-tone image with a binary image. This procedure must be accomplished in such a way as to give the illusion of multiple gray levels while introducing a minimum amount of artifacts or structure not present in the original continuous-tone image. In this investigation, nonperiodic noise patterns that were uniformly distributed, so as to maintain good continuous-tone reproduction, were generated and used as random halftone screens. The noise patterns also had a prescribed two-dimensional spatial correlation, chosen in an attempt to reduce the undesirable artifacts normally introduced by the halftone process. Noise that has a correlation such that its spectrum is lacking low-frequency power is sometimes referred to as "blue noise." An iterative method of generating random correlated noise patterns is described, and some examples of the resulting halftoned images are presented.

Paper Details

Date Published: 1 April 1992
PDF: 9 pages
J. Electron. Imaging. 1(2) doi: 10.1117/12.57524
Published in: Journal of Electronic Imaging Volume 1, Issue 2
Show Author Affiliations
Robert J. Rolleston, Xerox Corp. (United States)
Simon J. Cohen, Lawrence Livermore National Lab. (United States)

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