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


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