On high performance VF coding allowing fast and and sophisticated pattern matching

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In this study, the applicant addressed the problem of improving variable-length-to-fixed-length codes (VF codes). A VF code is an encoding scheme that uses a fixed-length code, which provides easy access to compressed data. However, conventional VF codes generally have an inferior compression ratio compared with variable-length codes. The applicant et al. proposed a new VF coding method that applies a fixed-length code to a set of rules extracted using the Re-Pair algorithm, which was proposed by Larsson and Moffat in 1999. The Re-Pair algorithm is a simple offline grammar-based compression method, which has good compression-ratio performance with moderate compression speed. The proposed method is named as Re-Pair-VF coding. The experimental results showed that Re-Pair-VF coding is superior to the existing VF coding method.