Method and apparatus for halftone rendering of a gray scale imag

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

1991-12-03

1994-08-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358536, 358523, 358456, 358457, 358465, H04N 146

Patent

active

053412281

ABSTRACT:
A method of and system for rendering a halftone image of a gray scale image by utilizing a pixel-by-pixel comparison of the gray scale image against a blue noise mask 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 or computer memory in order to produce the desired halftoned image. Both digital and optically implemented halftone methods are disclosed. Application specific modifications of the blue noise mask as well as its use for producing halftoned color images are also disclosed.

REFERENCES:
patent: 4833531 (1989-05-01), Abe et al.
patent: 5079624 (1992-01-01), Sasuga et al.
patent: 5109282 (1992-04-01), Peli
patent: 5111310 (1992-05-01), Parker et al.

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