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Universal Data Compression Algorithm Based on Approximate String Matching

Published online by Cambridge University Press:  27 July 2009

Ilan Sadeh
Affiliation:
Department of Communications Engineering, Center for Technological Education and Research, Holon affiliated with Tel Aviv University, P.O. Box 305, Holon, 58102, Israel

Abstract

A practical source coding scheme based on approximate string matching is proposed. It is an approximate fixed-length string matching data compression combined with a block-coder based on the empirical distribution. A lemma on approximate string matching, which is an extension of the Kac Lemma, is proved. It is shown, based on the lemma, that the deterministic algorithm converts the stationary and ergodic source, u, into an output process v, and under the assumption that v is a stationary process, after the scheme has run for an infinite time, the optimal compression ratio R(D) is achieved. This reduces the problem of the universal lossy coder to the proof of stationarity of the output process ν in the proposed algorithm. The main advantages of the proposed method are the asymptotic sequential behavior of the encoder and the simplicity of the decoder.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1996

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