Method and circuit for demodulating encoded data of facsimile ap

Details Method and circuit for demodulating encoded data of facsimile ap Method and circuit for demodulating encoded data of facsimile ap

1984-07-12

1986-12-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, H04N 140

Patent

active

046269215

ABSTRACT:
In order to increase decoding speed of two-dimensionally encoded facsimile data, changing pixels a.sub.0, a.sub.1, a.sub.2 and b.sub.1 (defined by CCITT) on a decoding and reference lines are detected, and the address of b.sub.1 is stored into a reference line address memory. The address of b.sub.1 is compared with the address of a.sub.1 during the vertical mode, and if a.sub.1 >b.sub.1, the address of a.sub.1 is stored into the reference line address memory. During the horizontal mode, the addresses of b.sub.1 and a.sub.2 are compared. If a.sub.2 >b.sub.1, the address of a.sub.2 is stored into the reference line address memory.

REFERENCES:
patent: 3927251 (1978-12-01), White et al.
patent: 4245257 (1981-01-01), Yamazaki et al.
patent: 4486784 (1984-12-01), Abraham et al.
CCITT Yellow Book, vol. VII-Fascicle VII.2, Geneva, 1981, pp. 225-235.

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