Arithmetic coding is a form of entropy encoding used in lossless data compression. Normally, a string of characters such as the words `hello there` is represented using a fixed number of bits per character, as in the ASCII code. When a string is converted to arithmetic encoding, frequently used characters will be stored with fewer bits and not-s.....
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http://en.wikipedia.org/wiki/Arithmetic_coding
Perhaps the major drawback to each of the Huffman encoding techniques is their poor performance when processing texts where one symbol has a probability of occurrence approaching unity. Although the entropy associated with such symbols is extremely low, each symbol must still be encoded as a discrete value. Arithmetic coding removes this restrictio...
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https://www.encyclo.co.uk/local/20687
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