Facsimile system

Details Facsimile system Facsimile system

1976-02-19

1978-07-11

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

340347DD, 358261, H04N 140, H04N 712

Patent

active

041005805

ABSTRACT:
A facsimile system including a picture pick-up arrangement in which the picture information to be transmitted is processed in separate groups of picture elements. The information of a first number of adjacent lines and a second number of adjacent picture elements is applied to a picture element comparison circuit. When only white information occurs in a group of picture elements thus formed this picture element group is represented by a logical 1. When there is black information in the picture element group an instantaneous derived code signal is formed with a logical 0 followed by a number of bits suitable for picture element coding. A considerable bit reduction is the result as compared with a one-bit representation per picture element. A specific choice of a clock pulse frequency results in a simple signal coding.

REFERENCES:
patent: 3478266 (1969-11-01), Gardenhire
patent: 3483317 (1969-12-01), De Groat
patent: 3571505 (1971-03-01), Mounts
patent: 3580999 (1971-05-01), Mounts
patent: 3726993 (1973-04-01), Lavallee
patent: 3730988 (1973-05-01), Shimizu
patent: 3813485 (1974-05-01), Arps

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