Picture processing method

Details Picture processing method Picture processing method

1980-04-11

1982-09-14

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, 358138, 364515, H04N 140

Patent

active

043498469

ABSTRACT:
A picture is sampled to provide the density levels of picture elements forming the picture. The estimation density level of an aimed picture element (to be processed) is calculated according to a particular equation, by using the density level of the aimed picture element and those of picture elements surrounding the aimed picture element. The estimation density level thus calculated is compared with a threshold, corresponding to the aimed picture element, in a threshold pattern, to determine whether the level of the aimed picture element is black or white. This process is carried out for all of the picture elements to restore the picture with binary outputs.

REFERENCES:
patent: 4184206 (1980-01-01), Harano
patent: 4214277 (1980-07-01), Urich
patent: 4258393 (1981-03-01), Ejiri et al.
patent: 4280144 (1981-07-01), Bacon

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