Digital coding apparatus and digital coding/decoding apparatus

Details Digital coding apparatus and digital coding/decoding apparatus Digital coding apparatus and digital coding/decoding apparatus

1995-07-12

1999-05-04

Vu, Kim Yen

Image analysis

Image compression or coding

Lossless compression

3582614, 358432, 382245, H04N 141

Patent

active

059012501

ABSTRACT:
In a digital coding apparatus or a digital coding and decoding apparatus for image data compression and expansion by means of Huffman coding, a Huffman coding circuit converts a combination of ZERO RUN and VALUE into a variable-length code. A code length calculation circuit has an AC code length table for prestoring variable-length codes and their code lengths in corresponding relationship. The code length calculation circuit inputs not a ZERORUN-VALUE combination but a variable-length code from the Huffman coding circuit, thereby calculating from the variable-length code inputted its code length according to the AC code length table. The present invention can provide a downsized AC code length table in comparison with a conventional one that stores ZERORUN-VALUE combinations and code lengths in corresponding relationship.

REFERENCES:
patent: 5138316 (1992-08-01), Konishi
patent: 5173695 (1992-12-01), Sun et al.
patent: 5184229 (1993-02-01), Saito et al.
patent: 5216518 (1993-06-01), Yamagami
patent: 5304995 (1994-04-01), Dachiku
patent: 5561422 (1996-10-01), Kim
Bolton, M.: "A Complete Single-Chip Implemenation of the JPEG Image Compression Standard", Proceedings of the Custom Integrated Circuits Conference, San Diego, May 12-15, 1991.

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