Adaptive Arithmetic Coding
One advantage of arithmetic coding over other similar methods of data compression is the convenience of adaptation. Adaptation is the changing of the frequency (or probability) tables while processing the data. The decoded data matches the original data as long as the frequency table in decoding is replaced in the same way and in the same step as in encoding. The synchronization is, usually, based on a combination of symbols occurring during the encoding and decoding process. Adaptive arithmetic coding significantly improves the compression ratio compared to static methods; it may be as effective as 2 to 3 times better in the result.
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