Stochastic Moire

摘要

In digital halftoning, moire refers to the periodic interference pattern created by superimposing the cyan, magenta, yellow, and black halftone patterns of periodic amplitude modulated screens. This paper introduces the concept of stochastic moire―the aperiodic interference pattern created by superimposing the aperiodic halftone patterns of frequency modulated screens. Given two overlapping stochastic halftone patterns, this paper details how to extract a continuous-space surface that completely characterizes the spatial fluctuations in color/texture of stochastic moire that exist in the halftone. To quantitatively measure the visibility of stochastic moire, this paper introduces a statistic for characterizing the fluctuations in color/texture that result from stochastic moire and shows how this metric can be used to identify the better of two arrangements of dots at minimizing the visual distortion stochastic moire creates.