Coding method for increasing data compression efficiency in tran

Details Coding method for increasing data compression efficiency in tran Coding method for increasing data compression efficiency in tran

1991-07-26

1992-11-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 7133

Patent

active

051629089

ABSTRACT:
A coding method for increasing the compression efficiency during transmissions or storing of video data is disclosed. The device for carrying out the coding method includes a CPU, a ROM, a RAM and a zig-zag scanning section. In carrying out the coding method, first, run fields, a count and a coefficient number is initialized. Then ac coefficients are zig-zag scanned, and the ac coefficients are checked as to whether they are 0 or not. If the ac coefficients are not 0, the run field and the count are increased by 1, and the non-zero coefficients are grouped together. The non-zero coefficients are coded, and an EONZ code is outputted to indicate the completion of the coding of the non-zero coefficients. Then the run field for the ac coefficients is coded. According to the present invention, the size of the coding table becomes smaller, the average length of the code word can be shortened, and the encoding and decoding can be carried out in a simpler manner.

REFERENCES:
patent: 4974078 (1990-11-01), Tsai
patent: 5045938 (1991-09-01), Sugiyama

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