Image processing method and apparatus

Details Image processing method and apparatus Image processing method and apparatus

1996-04-25

1998-07-07

Moore, David K.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358456, H04N 121

Patent

active

057777594

ABSTRACT:
An image processing apparatus includes an input unit for inputting image information, and a conversion unit for comparing the input image information with a plurality of threshold values and converting the input image information into data of three or more levels, wherein the conversion unit converts the input image information so as to form a dot at the central area of a screen mask if the input image information is low in density, and converts the input image information so as to form dots at the whole area of a screen mask if the input image information is middle and high in density.

REFERENCES:
patent: 4780768 (1988-10-01), Tomohisa et al.
patent: 4884080 (1989-11-01), Hirahara et al.
patent: 4977464 (1990-12-01), Ikuta
patent: 5495278 (1996-02-01), Oda et al.
patent: 5546197 (1996-08-01), Shibazaki et al.

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