METHOD AND APPARATUS FOR HALFTONE RENDERING OF A GRAY SCALE IMAGE USING A BLUE NOISE MASK

摘要

A method of and system for rendering a halftone image of a gray scale image(500) by utilizing a pixel-by-pixel comparison (402) of the gray scale image against a bluenoise mask (502) is disclosed in which the gray scale image is scanned on a pixel-by-pixelbasis and compared on a pixel-by-pixel basis to an array of corresponding data pointscontained in a blue noise mask stored in a PROM (406) or computer memory in order toproduce the desired halftoned image. Both digital and optically implemented halftonemethods are disclosed. Application specific modifications of the blue noise mask as well asits use for producing halftoned color images are also disclosed.