Halftoning with random correlated noise

Robert J. Rolleston; Simon J. Cohen

doi:10.1117/12.57524

1 April 1992 Halftoning with random correlated noise

Robert J. Rolleston, Simon J. Cohen

Author Affiliations +

Journal of Electronic Imaging, Vol. 1, Issue 2, (April 1992). https://doi.org/10.1117/12.57524

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.

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Robert J. Rolleston and Simon J. Cohen "Halftoning with random correlated noise," Journal of Electronic Imaging 1(2), (1 April 1992). https://doi.org/10.1117/12.57524

Published: 1 April 1992

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