Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-04-11
1986-11-11
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, 358260, H04N 712
Patent
active
046225854
ABSTRACT:
In a system for the line-wise compression of binary data of a picture field, a first series of data bits of a current picture line and a second series of data bits of the directly preceding picture line are shifted together into a compression translator. A word of a line memory is read in a compression translator in order to obtain the data of the preceding line. At the same time the same word is written in to buffer the data of the current line. Compression bits are formed from the preceding and current line data. At the output of the compression translator the serial compression bits are regrouped in order to form words. Exclusive groups of significant compression bits are thus formed. During decompression a code word is read and a series of data bits is emulated and encoded as if it were the code word read. When the code word thus found corresponds to the code word read, a next code word is read and possibly a change of value for the data bits to be subsequently emulated is introduced.
REFERENCES:
patent: 3553362 (1971-01-01), Mounts
patent: 4276544 (1981-06-01), Iinuma
patent: 4394774 (1983-07-01), Wildergren et al.
patent: 4420771 (1983-12-01), Pirsch
patent: 4485402 (1984-11-01), Searby
CCITT Recommendation T4, Fascicle VII.2, pp. 3-17, sections 3.2-4.2.5 (Geneva 1980).
Briody Thomas A.
Britton Howard W.
Kostak Victor R.
Streeter William J.
U.S. Philips Corporation
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