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The Compression Optimality of Asymmetric Numeral Systems.

Josef Pieprzyk1,2, Jarek Duda3, Marcin Pawłowski3

  • 1Institute of Computer Science, Polish Academy of Sciences, 01-248 Warsaw, Poland.

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Summary
This summary is machine-generated.

Asymmetric numeral systems (ANS) offer efficient data compression. This study proves ANS achieves optimal compression for specific probability distributions and introduces algorithms to enhance compression ratios, even on quantum computers.

Keywords:
ANSentropy codinglossless compressionsource coding

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Area of Science:

  • Computer Science
  • Information Theory
  • Data Compression

Background:

  • Multimedia internet applications drive demand for efficient data compression.
  • Asymmetric numeral systems (ANS) provide high compression with low redundancy.
  • Designing optimal ANS instances requires careful selection of symbol spread functions.

Purpose of the Study:

  • Investigate the compression optimality of Asymmetric Numeral System (ANS).
  • Determine conditions under which ANS achieves optimal compression rates.
  • Develop algorithms for discovering high-performance ANS instances.

Main Methods:

  • Utilized Markov chains to calculate ANS state probabilities.
  • Analyzed compression optimality for symbol sources with power-of-1/2 probability distributions.
  • Developed two algorithms for finding ANS instances with improved compression ratios.

Main Results:

  • Demonstrated that ANS is optimal for symbol sources with probability distributions as natural powers of 1/2.
  • Presented algorithms that approximate or achieve near-optimal compression ratios.
  • Analyzed algorithmic complexity, including quantum computing implementations.

Conclusions:

  • ANS compression is mathematically elegant and practically efficient.
  • Optimal ANS instances can be systematically found, improving compression performance.
  • Future research can leverage quantum computing for further optimization.