Method of reproducing a picture having improved resolution

Details Method of reproducing a picture having improved resolution Method of reproducing a picture having improved resolution

1980-06-02

1983-07-12

Gruber, Felix D.

Boots, shoes, and leggings

358166, 358284, 382 50, G06F 1520, H04N 514

Patent

active

043934528

ABSTRACT:
In a picture processing method, the density data of picture elements in a particular picture element region in a 4.times.4 arrangement which is provided by decomposing an original picture into a number of picture elements are subjected to n-base quantization to provide density levels thereof, and the particular picture element region is divided into an aimed picture element region consisting of four picture elements in the central part of the particular picture element region and a surrounding region consisting of twelve picture elements surrounding the aimed picture element region. The aimed picture element region is converted into a minute picture element region in 3.times.3 arrangement consisting of nine minute picture elements. The estimation density levels of these minute picture elements are calculated according to particular equations by using the density levels of the picture elements in the particular picture element region, and are compared with the threshold levels in a predetermined threshold pattern provided for the minute picture element region, to determine whether the level of each minute picture element is "black" or "white".

REFERENCES:
patent: 3462547 (1969-08-01), Macovski
patent: 4124870 (1978-11-01), Schatz et al.
patent: 4127873 (1978-11-01), Katagi
patent: 4150401 (1979-04-01), Yamamoto et al.
patent: 4184206 (1980-01-01), Harano
patent: 4214277 (1980-07-01), Urich
patent: 4215414 (1980-07-01), Huelsman
patent: 4231095 (1980-10-01), Cassagne
patent: 4323974 (1982-04-01), Sekigawa

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