
Run-length encoding (RLE) is a very simple form of data compression in which runs of data (that is, sequences in which the same data value occurs in many consecutive data elements) are stored as a single data value and count, rather than as the original run. This is most useful on data that contains many such runs. Consider, for example, simple gr...
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http://en.wikipedia.org/wiki/Run-length_encoding

(from the article `data compression`) ...alphabet. Arithmetic coding encodes strings of symbols as ranges of real numbers and achieves more nearly optimal codes. It is slower than Huffman ... Certain signal sources are known to produce `runs,` or long sequences of only 1s or 0s. In these cases it is more efficient to transmit ...
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http://www.britannica.com/eb/a-z/r/78

See Non-Lossy Compression.
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https://www.encyclo.co.uk/local/22369
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