Method and apparatus for generating halftone dots

Details Method and apparatus for generating halftone dots Method and apparatus for generating halftone dots

1997-05-15

1999-07-13

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358457, 358298, 382237, H04N 140

Patent

active

059238232

ABSTRACT:
The present invention generates a first threshold value constituting a first threshold pattern and a second threshold value constituting a second threshold pattern. The first threshold pattern is to reproduce a relatively large number of tones and is relatively small in size, while the second threshold pattern has a relatively small number of tones and is relatively large in size. An arithmetic operation is carried out on the first threshold value and the second threshold value so as to generate a third threshold value. The third threshold value is compared with an image signal to generate a dot signal representing a halftone dot.

REFERENCES:
patent: 4736254 (1988-04-01), Kotera et al.
patent: 5418618 (1995-05-01), Kagawa et al.
patent: 5469515 (1995-11-01), Lin
patent: 5703692 (1997-12-01), Nguyen

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