Information forming apparatus

Details Information forming apparatus Information forming apparatus

1979-09-13

1982-12-28

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358288, H04N 712

Patent

active

043665055

ABSTRACT:
The present invention is featured, in the transmission of pixel (picture element) signals grouped into blocks defined in a series of pixel signals, by sending a control signal instead of said pixel signals when the pixel signals contained in a block are all white signals or sending pixel signals after modulation when black signals are present in said block thereby compressing the time required for transmission, also by selecting the maximum amplitude of said control signal larger than the maximum amplitude of said modulated pixel signals thereby enabling identification of said control signals from said pixel signals, and by sending, when the final black pixel signal in a black signal containing block is followed by consecutive white pixel signals, a control signal instead of such white pixel signals thereby achieving further compression of the transmission time.

REFERENCES:
patent: 3588329 (1971-06-01), Monk
patent: 4186415 (1980-01-01), Takaynma

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