Fixed length semiorder preserving code for field level data file compression

摘要

An encoding scheme (FLSOPC) is presented as a new data compression method. The generated fixed-length codes are preserving the order on the original data representations in the sense of semiorder preservation as defined in this paper. The FLSOPC employing binary sectioning assignment algorithm requires the code size that is linear to logarithm of the data cardinality. It is about 2.8 times that required by FLMB (fixed-length minimum bit) encoding when no knowledge about data is given a priori. This factor can be reduced to 2.1 if a half of data has been available as the initial load and approaches 1 when even more data is known.