Image processing apparatus

Details Image processing apparatus Image processing apparatus

1990-07-06

1993-04-06

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358453, H04N 140

Patent

active

052008401

ABSTRACT:
An image processing apparatus comprises an image-area discriminating circuit for discriminating the attribute of an image, such as whether it is a character/line image or a dot image or whether or not it is an isolated point noise, and outputting a discrimination result, an enlargement/reduction processing circuit for performing enlargement/reduction processing on an image, and a filtering circuit for controlling the spatial frequency response of an image in accordance of a discrimination signal.

REFERENCES:
patent: 4661843 (1987-04-01), Sekizawa et al.
patent: 4663662 (1987-05-01), Sekizawa et al.
patent: 4895431 (1990-01-01), Tsujiuchi et al.
patent: 5023919 (1991-06-01), Wataya
patent: 5072291 (1991-12-01), Sekizawa et al.
Patent Abstracts of Japan vol. 12 no. 217 (-624) (3064) Jun. 21, 1988 & JP-A-63 013 578 (Canon) Jan. 20, 1988.

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