Digital halftoning combining multiple screens within a single im

Details Digital halftoning combining multiple screens within a single im Digital halftoning combining multiple screens within a single im

1997-04-01

2000-09-12

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 382237, H04N 140

Patent

active

061189359

ABSTRACT:
An apparatus and method of producing enhanced digital imaging for printing data, in flexographic and other types of printing environments, combines halftone screens which represent continuous "gray tone" (grey tone) levels, wherein the transition from one screen to the other is not visually detectable by an observer of the reproduction results. The digital processing method includes combining an (FM generated) dispersed dot screen with an (AM generated) cluster dot screen, with an overlay interval of both screens of acceptable resultant dot size (percent coverage), to obtain enhanced overall definition over the grey scale range of 1 to 100 percent (i.e., where 100 is equal to "255" in 8-bit environment), specifically over the more visually perceptive gray scale range of 1 to 20 (i.e., out of 0-255 value). The apparatus which implements the method algorithm is positioned intermediate a desktop publishing system and an image setter.

REFERENCES:
patent: 4866534 (1989-09-01), Tada
patent: 5802212 (1998-09-01), Shu et al.

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