Can We Do without Ranks in Burrows Wheeler Transform Compression?

  • Authors:
  • Anthony Ian Wirth;Alistair Moffat

  • Affiliations:
  • -;-

  • Venue:
  • DCC '01 Proceedings of the Data Compression Conference
  • Year:
  • 2001

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Abstract

Abstract: Compressors based on the Burrows Wheeler transform (BWT) convert the transformed text into a string of (move-to-front) ranks. These ranks are then encoded with an Order-0 model, or a hierarchy of such models. Although these rank-based methods perform very well, we believe the transformation to MTF numbers blurs the distinction between individual symbols and is a possible cause of inefficiency. Instead of relying on symbol ranking, we examine the problem of directly encoding the symbols in the BWT text.