Variable length decoding using lookup tables

Details Variable length decoding using lookup tables Variable length decoding using lookup tables

1990-12-31

1993-10-12

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382 56, H04N 712

Patent

active

052530531

ABSTRACT:
A method and apparatus for decoding a variable length codeword (VLC) by reading a VLC, the VLC having a maximum length of X bits. The VLC is used as an index into a first table, wherein the first table contains decoded values for all possible VLC's with Y bits not equal to any value in a first set of values. Y is typically less than X and comprises, in the preferred embodiment, the most significant bits of the VLC. If the first Y bits of the VLC are not equal to any value in a first set of values then a second value is returned from the first table. If the first Y bits of the VLC are equal to any value in a first set of values, then a pointer to a second table is returned from the first table. The VLC is used as an index into the second table, and a third value is returned from the second table.

REFERENCES:
patent: 4845559 (1989-07-01), Labit et al.
patent: 4922508 (1990-05-01), Moriya
patent: 4933762 (1990-06-01), Guichard et al.
patent: 4963030 (1990-10-01), Makur
patent: 5068723 (1991-11-01), Dixit et al.

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