Context exhumation after the Burrows--Wheeler transform

  • Authors:
  • Sebastian Deorowicz

  • Affiliations:
  • Silesian University of Technology, Institute of Computer Science, 44-100 Gliwice, Akademicka 16, Poland

  • Venue:
  • Information Processing Letters
  • Year:
  • 2005

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Abstract

The essence of compression algorithms based on the Burrows-Wheeler transform is their first stage. In this stage, the information about the symbol contexts in the original sequence is lost and cannot be used in the rest of the algorithm. We show how to obtain some knowledge of the symbol contexts after the BWT. Using this information makes the prediction of symbol occurrence in further stages more accurate, which is confirmed by experiments.