Data processing apparatus

Details Data processing apparatus Data processing apparatus

1984-02-08

1989-04-04

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 341 67, H04N 100

Patent

active

048190799

ABSTRACT:
An apparatus for data compression, in which a code of variable code length, for example modified Huffman code, is converted into a code of constant length through a memory stores code data obtained by conversion of input image data in a memory device on a parallel basis. The storage of the code data is controlled to cause the memory device to store each set or group of code data immediately following the code data which have already been stored there, to permit continuous code data storage without a break and thus at high speed. The code data may first be stored in a separate memory device, in sets of variable length. Code data may, for example, be formed continuously from image data released in accordance with a first clock signal, the continuous data being formed in accordance with a second clock signal the frequency of which is higher than that of the first. In another aspect, image data obtained by reading a document image are sequentially encoded into code data, which are then taken into a register device which can shift a plurality of bits upon application of a single clock pulse.

REFERENCES:
patent: 4376933 (1983-03-01), Saran et al.
patent: 4533956 (1981-08-01), Fedde
IBM Technical Disclosure Bulletin, vol. 19, No. 5, pp. 1892-1895 (Oct. 1976).
IBM Technical Disclosure Bulletin, vol. 23, No. 3, pp. 1211-1216 (Aug. 1980).

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