Picture processing method

Details Picture processing method Picture processing method

1979-11-01

1981-03-24

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358138, 358280, 364515, H04N 140

Patent

active

042583934

ABSTRACT:
In a picture processing method according to the present invention, a picture element S(i,j) to be processed is divided into four smaller picture elements S.sub.1 (i,j) through S.sub.4 (i,j). The density of each of the smaller picture elements is determined from the algebraic mean value of the densities of the picture element and the picture elements surrounding the firstly mentioned picture elements. Each smaller picture element S.sub.m (i,j) (m=1,2,3, and 4) is determined by a DITHER MATRIX T(k,l) as S.sub.m (i,j)=1 when S.sub.m (i,j).gtoreq.T(k,l) and S.sub.m (i,j)=0 when S.sub.m (i,j)<T(k,l) where, using Gauss' notation,

REFERENCES:
patent: 3294896 (1966-12-01), Young
patent: 3739082 (1973-06-01), Lippel
patent: 3916096 (1975-10-01), Everett
patent: 4184206 (1980-01-01), Harano
patent: 4205341 (1980-05-01), Mitsuya

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