Processor for increasing the run-length of facsimile data

Details Processor for increasing the run-length of facsimile data Processor for increasing the run-length of facsimile data

1976-10-21

1978-04-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358133, 358261, H04N 712

Patent

active

040866203

ABSTRACT:
A facsimile scene typically includes a plurality of lines, each line having a plurality of picture elements (pels). Often, pel signals are adaptable for run-length coding, a run being one or more successive pels having the same brightness level. To increase the length of a run and hence to permit a more efficient use of a transmission link, a processor is disclosed for permuting a measure of the pel signals responsive to a reference signal. Illustratively, the reference signal is the pel signal from a previous line. In one exemplary bi-level pel signal embodiment, the measure is the current pel signal. Specifically, if the reference pel signal is a logic one, the current pel signal is loaded beginning at one end of a memory; if the reference pel signal is a logic zero, the current pel signal is loaded beginning at the other end of the memory. In a second embodiment, the measure is an error signal for indicating a difference between the reference signal and the current pel signal. But for loading the error signal rather than the current pel signal, the operations aforedescribed are again followed.

REFERENCES:
patent: 2978535 (1961-04-01), Brown
patent: 3804975 (1974-04-01), Abe

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