Another Huffman-based compressor was used in the tests –. WinRar, WinZip, and WinAce were chosen among the usual compression programs in order to compress the set of text files. The compression ratios obtained for the original and the transformed (*) files are presented in Figs. The files (book1 – 750.74 kB, book2 – 596.54 kB, paper1 – 51.91 kB, paper2 – 80.27 kB) are part of the Calgary Corpus. In order to test the influence of the Star Transform on the compression ratio we have performed a set of experiments using text files with different size and content. The compression ratio of the BWT algorithm is very close to the average of the compression ratios of the standard compressors. The advantages of using BTW for all files (and especially for the image file) are obvious. The dimensions of the compressed files (using the 3 standard compressors and the BWT algorithm) are shown in Fig. WinRAR, WinAce and WinZip were chosen among the usual compression programs, in order to compare the performances of the algorithm presented above, applied on the same 5-file test set. BWT but also by the adaptive arithmetic compression, which supposes a two- stage processing of the block and an adjustment of the codewords, depending on their frequencies and, eventually, on the number of symbols.
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