Method and apparatus for halftone rendering of a gray scale...

Details Method and apparatus for halftone rendering of a gray scale... Method and apparatus for halftone rendering of a gray scale...

H - Electricity

04

N

H04N 1/40 (2006.01) G06T 3/40 (2006.01) H04N 1/405 (2006.01) H04N 1/41 (2006.01) G06F 15/62 (1990.01)

Patent

CA 2097508

A method of and system for rendering a halftone image of a gray scale image (500) by utilizing a pixel-by-pixel comparis- on (402) of the gray scale image against a blue noise mask (502) is disclosed in which the gray scale image is scanned on a pixel- by-pixel basis and compared on a pixel-by-pixel basis to an array of corresponding data points contained in a blue noise mask stored in a PROM (406) or computer memory in order to produce the desired halftoned image. Both digital and optically imple- mented halftone methods are disclosed. Application specific modifications of the blue noise mask as well as its use for producing hafltoned color images are also disclosed.

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