Chain code lossless compression using move-to-front transform and adaptive run-length encoding

  • Authors:
  • Borut Alik;Niko Lukač

  • Affiliations:
  • -;-

  • Venue:
  • Image Communication
  • Year:
  • 2014

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Abstract

Chain codes are the most size-efficient representations of rasterised binary shapes and contours. This paper considers a new lossless chain code compression method based on move-to-front transform and an adaptive run-length encoding. The former reduces the information entropy of the chain code, whilst the latter compresses the entropy-reduced chain code by coding the repetitions of chain code symbols and their combinations using a variable-length model. In comparison to other state-of-the-art compression methods, the entropy-reduction is highly efficient, and the newly proposed method yields, on average, better compression.