Method and apparatus for image data compression and decompressio

Details Method and apparatus for image data compression and decompressio Method and apparatus for image data compression and decompressio

1981-10-13

1983-08-16

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358262, 340347DD, H04N 100

Patent

active

043994679

ABSTRACT:
A data compression system which generates several types of symbols from bands of data derived from the digital image. Each group of data bits located in the same bit position across the data band is represented by a mode symbol, which signifies the decimal value of the binary combination of the data contained in that group. The mode symbol is followed by a run symbol, which represents the number of times or incremental positions that the same mode occurs successively until a different mode is generated. Mode and run symbols are transmitted in alternation, with each mode symbol followed by its corresponding run symbol, to an encoder, which generates variable length code words that are transmitted to a receiving station and decoded to provide symbols which are used to form a facsimile image. In one embodiment of this system, the mode and run symbols are combined to form a different type of symbol, known as a ternary octade symbol, to further improve the compression performance of the system.

REFERENCES:
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patent: 4070694 (1978-01-01), Sakamoto et al.
patent: 4096520 (1978-06-01), Furuta
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patent: 4136363 (1979-01-01), Saran
patent: 4163260 (1979-07-01), Hisao et al.
patent: 4254438 (1981-03-01), Yamazaki et al.
U.S. Pat. appln. Ser. No. 269,237, filed Jun. 1, 1981, "Image Reduction System", by Robert S. Moore et al.
U.S. Pat. appln. Ser. No. 303,676, filed Sep. 18, 1981, "Data Decompression Apparatus and Method", by Robert S. Moore.

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