From Run Length Encoding to LZ78 and Back Again

2013 Data Compression Conference Pub Date : 2013-03-20 DOI:10.1109/DCC.2013.22

Yuya Tamakoshi, T. I., Shunsuke Inenaga, H. Bannai, M. Takeda

引用次数: 8

Abstract

In this paper, we present efficient algorithms for interconversion between Lempel-Ziv 78 (LZ78) encoding and run length encoding (RLE). We show how, given an RLE of size n for a string S, we can compute the corresponding LZ78 encoding of size m for S in O((n + m) log σ) time, where σ is the number of distinct characters appearing in S. We also show how, given an LZ78 encoding of size m for a string S, we can compute the corresponding RLE of size n in O(n + m) time. Both algorithms use O(m) extra working space.

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从运行长度编码到LZ78再返回

本文提出了LZ78 (Lempel-Ziv 78)编码与RLE编码之间的有效转换算法。我们展示了如何在给定字符串S的大小为n的RLE的情况下，在O((n + m) log σ)时间内计算出大小为m的对应的LZ78编码，其中σ是S中出现的不同字符的数量。我们还展示了如何在给定字符串S的大小为m的LZ78编码的情况下，在O(n + m)时间内计算出大小为n的对应的RLE。两种算法都使用O(m)的额外工作空间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2013 Data Compression Conference

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