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

1990-12-04

1992-05-05

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, H04N 140

Patent

active

051113104

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.

REFERENCES:
patent: 4425642 (1984-01-01), Moses et al.
patent: 4698691 (1987-10-01), Suzuki et al.
patent: 4736254 (1988-04-01), Kotera et al.
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4819075 (1989-04-01), Imaide et al.
patent: 4912569 (1990-03-01), Petilli
patent: 4920501 (1990-04-01), Sullivan et al.
"Dithering with Blue Noise", Robert A. Ulichney, Proceedings of the IEEE, vol. 76, No. 1, Jan. 1988, pp. 56-79.

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