Data compression and decompression method and apparatus with...

Details Data compression and decompression method and apparatus with... Data compression and decompression method and apparatus with...

H - Electricity

03

M

H03M 7/30 (2006.01)

Patent

CA 2425227

A data compression and decompression system based on the LZW data compression and decompression methodology that includes exclusion tables storing strings that are infrequently encountered. If an extended string formed for updating the compressor and decompressor dictionaries is included in the exclusion tables, the extended string is not stored and the code counter for assigning codes to dictionary strings is not advanced. In this manner, dictionary codes are not usurped by infrequently encountered strings.

L'invention concerne un système de compression et de décompression basé sur la méthodologie LZW de compression et de décompression de données comprenant des tables d'exclusion stockant des chaînes rarement rencontrées. Si une chaîne étendue formée aux fins de mises à jour des dictionnaires de compression et de décompression est incluse dans les tables d'exclusion, la chaîne étendue n'est pas stockée et le compteur de code qui attribue des codes aux chaînes de dictionnaire n'est pas avancé. De cette façon, les codes de dictionnaire ne sont pas encombrés de chaînes rarement rencontrées.

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