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In information theory, an entropy coding (or entropy encoding) is any lossless data compression method that attempts to approach the lower bound declared by Shannon's source coding theorem, which states that any lossless data compression method must have an expected code length greater than or equal to the entropy of the source.
In the field of data compression, Shannon coding, named after its creator, Claude Shannon, is a lossless data compression technique for constructing a prefix code based on a set of symbols and their probabilities (estimated or measured).
In computer science and information theory, a Huffman code is a particular type of optimal prefix code that is commonly used for lossless data compression.The process of finding or using such a code is Huffman coding, an algorithm developed by David A. Huffman while he was a Sc.D. student at MIT, and published in the 1952 paper "A Method for the Construction of Minimum-Redundancy Codes".
In information theory, Shannon–Fano–Elias coding is a precursor to arithmetic coding, in which probabilities are used to determine codewords. [1] It is named for Claude Shannon , Robert Fano , and Peter Elias .
Unfortunately, Shannon–Fano coding does not always produce optimal prefix codes; the set of probabilities {0.35, 0.17, 0.17, 0.16, 0.15} is an example of one that will be assigned non-optimal codes by Shannon–Fano coding. Fano's version of Shannon–Fano coding is used in the IMPLODE compression method, which is part of the ZIP file format ...
For much of Huffman's tenure, the show's set was bleachers or benches for children against a backdrop mural of cartoon characters, mostly those from Looney Tunes. Special episodes were occasionally done on location, in area shopping malls or as part of large local events, like the annual Sternwheeler Regatta.
Prediction by partial matching (PPM) is an adaptive statistical data compression technique based on context modeling and prediction.PPM models use a set of previous symbols in the uncompressed symbol stream to predict the next symbol in the stream.
Shannon-Fano coding is used in the IMPLODE compression method, which is part of the ZIP file format. Can anyone actually confirm this? APPNOTE.TXT talks about the codes as Shannon-Fano codes, but as far as I can see, the specs don't put any limitation on what algorithm is used to generate the code lengths when the file is actually compressed.