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Entropy 2015, 17(5), 3400-3418;

Entropy Approximation in Lossy Source Coding Problem

Department of Mathematics and Computer Science, Jagiellonian University, Lojasiewicza 6, 30-348 Kraków, Poland
Author to whom correspondence should be addressed.
Academic Editor: Raúl Alcaraz Martínez
Received: 26 March 2015 / Revised: 11 May 2015 / Accepted: 12 May 2015 / Published: 18 May 2015
(This article belongs to the Section Information Theory)
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In this paper, we investigate a lossy source coding problem, where an upper limit on the permitted distortion is defined for every dataset element. It can be seen as an alternative approach to rate distortion theory where a bound on the allowed average error is specified. In order to find the entropy, which gives a statistical length of source code compatible with a fixed distortion bound, a corresponding optimization problem has to be solved. First, we show how to simplify this general optimization by reducing the number of coding partitions, which are irrelevant for the entropy calculation. In our main result, we present a fast and feasible for implementation greedy algorithm, which allows one to approximate the entropy within an additive error term of log2 e. The proof is based on the minimum entropy set cover problem, for which a similar bound was obtained. View Full-Text
Keywords: Shannon entropy; entropy approximation; minimum entropy set cover; lossy compression; source coding Shannon entropy; entropy approximation; minimum entropy set cover; lossy compression; source coding
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Śmieja, M.; Tabor, J. Entropy Approximation in Lossy Source Coding Problem. Entropy 2015, 17, 3400-3418.

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