Method of and apparatus for smoothing an image having a periodic

Details Method of and apparatus for smoothing an image having a periodic Method of and apparatus for smoothing an image having a periodic

1990-06-26

1991-11-12

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382 55, H04N 140

Patent

active

050652559

ABSTRACT:
An image signal representing image information containing a periodic pattern is processed before it is broken up into halftone dots. First, the image information is averaged to generate an unsharpness signal, and then the unsharpness signal is processed for edge sharpness to generate a sharpness signal. Thereafter, a halftone-dot image is generated from the sharpness signal. More specifically, the sharpness signal Sij* is generated from a first unsharpness signal Uij which is produced by averaging the image information and a second unsharpness signal Uij which is produced by averaging the first unsharpness signal Uij, according to the equation:

REFERENCES:
patent: 4703363 (1987-10-01), Kitamura
patent: 4855933 (1989-08-01), Kondo
patent: 4873577 (1989-10-01), Chamzas
patent: 4980923 (1990-12-01), Kawamoto et al.

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