Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1984-12-11
1986-12-16
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358263, 358133, H04N 1417
Patent
active
046301240
ABSTRACT:
A facsimile signal coding system is disclosed, in which initial encoding is performed for detecting, from picture elements forming a facsimile picture signal, picture elements at intervals of .DELTA.X picture elements on every .DELTA.Yth line and encoding the detected picture elements. Encoding of mode 1 is carried out for encoding, by referring to four of the encoded picture elements, a picture element surrounded by the reference picture elements and lying centrally thereof. Encoding of mode 2 is performed by encoding, by referring to four picture elements encoded by the initial encoding and the encoding of mode 1, a picture element surrounded by the four picture elements lying above and below it and on its left and right. The initial encoding and the encoding of mode 1 and mode 2 are effected using 2.sup.n (where n is an integer) as an initial value of each of the .DELTA.X and .DELTA.Y and thereafter the encoding operations of mode 1 and mode 2 are repeated with the values of the .DELTA.X and .DELTA.Y reduced by half.
REFERENCES:
patent: 4222076 (1980-09-01), Knowlton
patent: 4261018 (1981-04-01), Knowlton
patent: 4414580 (1983-11-01), Johnsen et al.
Endoh Toshiaki
Yamazaki Yasuhiro
Adams Bruce L.
Burns Robert E.
Kokusai Denshin Denwa Kabushiki Kasiha
Lobato Emmanuel J.
Peng John K.
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