Image processing device, image processing system, and method for

Details Image processing device, image processing system, and method for Image processing device, image processing system, and method for

1997-05-20

2000-06-27

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358458, 358536, H04N 140

Patent

active

060813490

ABSTRACT:
An image processing system and method is presented which is capable of maintaining a high line count while preventing the generation of low-frequency periodic structures, using the supertiling method for image output devices such as printers. Threshold value matrix patterns are used for each supertile, and the input image data is compared with the threshold value. A dot pattern (binary image data) is generated based on the result of the comparison. Each supertile is divided up into a plurality (3.times.3) of halftone cells, and a dot pattern is generated for each halftone cell. A plurality of threshold value matrix patterns P1-P10 having identical shapes is used, and the pattern to be applied is selected randomly. This results in unevenness in the "centers of gravity" of the dots in the halftone cells. Thus, no periodic structures appear.

REFERENCES:
patent: 4930023 (1990-05-01), Yakame
patent: 5422742 (1995-06-01), Ostromoukhov et al.
patent: 5745660 (1998-04-01), Kolpatzik et al.

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