Method of enlarging/reducing dithered images

Details Method of enlarging/reducing dithered images Method of enlarging/reducing dithered images

1989-06-06

1990-06-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358287, H04N 140

Patent

active

049376772

ABSTRACT:
The entire dithered image to be enlarged/reduced is divided into contiguous relatively small areas, called input areas, and the pixel pattern of each input area is represented by (i) an average gray level characterized by a standard pixel pattern and (ii) the pixels deviating from the standard pattern. Every input area is imaged onto an output area according to the enlargement/reduction factor, whereby the output area is filled with a standard pixel pattern yielding the average gray level of the input area and extra pixels are added to the standard pattern for the deviating pixels of the input area on locations determined by linear transformation.

REFERENCES:
patent: 4730221 (1988-03-01), Roetling
patent: 4758897 (1988-07-01), Hiratsuka
patent: 4766499 (1988-08-01), Inuzuka
patent: 4775886 (1988-10-01), Hirosawa
patent: 4796094 (1989-01-01), Van Dorsseater
patent: 4800443 (1989-01-01), Crinon et al.
patent: 4803558 (1989-02-01), Hiratsuka

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