Facsimile compression system

Details Facsimile compression system Facsimile compression system

1977-02-18

1978-05-23

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, H04B 712

Patent

active

040914240

ABSTRACT:
Disclosed herein is a data compression system for compressing binary facsimile data to reduce transmission times over standard telephone system circuits. At the transmit end of the circuit a segment of adjacent scans of, e.g., a white or light background document having, e.g., black typewritten characters or other symbols thereon is stored in a binary format in a buffer memory. A scanner scans the memory to locate the position of a beginning point of each individual character. A block definer circuit then defines a rectangular block closely enclosing the character. A block mapping circuit then scans the block following a predetermined pattern and provides a binary sequence of the black and white portions thereof. A run length encoder may then encode the binary sequence by run length or by Huffman code. A modem connected to the telephone lines sends data corresponding to the location, size and contents of each character block to a receiving modem at the receive end of the telephone circuit.

REFERENCES:
patent: 3980809 (1976-09-01), Cook

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