Method for restricting total code volume in data-compression

Details Method for restricting total code volume in data-compression Method for restricting total code volume in data-compression

1995-06-07

1997-02-11

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348405, 348404, 348419, H04N 7133

Patent

active

056025904

ABSTRACT:
In a data-compression of a moving picture employing MPEG system, the quantization step used for quantizing coefficients of frequency components obtained in DCT (discrete cosine transform), is determined on a first frame of the moving picture, and is used for all the frames of the moving picture. A frame is processed by first run of data-compression. Code volume is allotted for each block in accordance with data obtained by the first run of data-compression, and in second run of data-compression, Huffman coding is discontinued when generated code volume of a block becomes larger than the code volume allotted to the block. When generated code volume of a frame is smaller than the target code volume of a frame, the surplus target code volume is added to a target code volume of a succeeding frame.

REFERENCES:
patent: 5159447 (1992-10-01), Haskell et al.
patent: 5241383 (1993-08-01), Chen et al.
patent: 5245427 (1993-09-01), Kunishiro
patent: 5402176 (1995-03-01), Murakami et al.
patent: 5404168 (1995-04-01), Yamada et al.
patent: 5426463 (1995-06-01), Reininger et al.

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