Patent ID: 8467103
Filing Date: 2013-06-18
Classification: H04N

Abstract:
1. A moiré-free halftone image forming method for reproducing an image using a different halftone screen with hexagonally tiled clusters for each colorant associated with an image rendering device, the method comprising: a) defining a first colorant halftone screen with hexagonally tiled clusters having a first fundamental frequency vector V b) defining a second colorant halftone screen with hexagonally tiled clusters having a first fundamental frequency vector V c) selecting the values of the fundamental frequency vectors V d) generating the first colorant halftone screen, and the second colorant halftone screen; e) applying the first colorant halftone screen to the image to produce a first colorant halftone output, and applying the second colorant halftone screen to the image to produce a second colorant halftone output; and f) overlaying the first colorant halftone output and the second colorant halftone output to reproduce the image with a moiré-free halftone image.