Patent ID: 6833933
Filing Date: 2004-12-21
Classification: H04N

Abstract:
A method of generating a stochastic screen for use in printing a halftone containing image on a surface, where the generated stochastic screen comprises an array of threshold values each of which represents a halftone threshold at which pixels are printed at the corresponding location, the method comprising:a) entering a first threshold value into the array; b) for a first halftone level, defining a plurality of threshold values to be entered into the array and, for each threshold value to be placed, for each of a number of candidate locations in the array, evaluating a distance function between the candidate location and the locations of threshold values already placed into the array, and placing the threshold value into the array at a location for which the distance function is substantially minimized, and c) repeating the process of step b) for each subsequent halftone level.