Method and device for image reduction in image processing

Details Method and device for image reduction in image processing Method and device for image reduction in image processing

1988-12-08

1990-05-29

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, H04N 140

Patent

active

049300229

ABSTRACT:
Dither element values predetermined at all pixels of a dither matrix pattern prepared for an equality function are outputted one by one each time on n.times.n unit matrix of a read-out image obtained from a given original image by an image reading device such as an image scanner is subjected to extraction of brightness feature in 1
image reducing mode. Thus, even a halftone image such as a photograph can be effectively reduced to scale an reproduced as a reduced image on a monitor display or the like.

REFERENCES:
patent: 4639790 (1987-01-01), Kusaka
patent: 4740844 (1988-04-01), Yoshimura
patent: 4758897 (1988-07-01), Hiratsuka et al.
patent: 4803558 (1989-02-01), Hiratsuka et al.
patent: 4827353 (1989-05-01), Ehlers et al.

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