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XOR'easter (talk | contribs) Undid revision 1261657597 by JulioISalazarG (talk): the cited article is about macaque brains, not run-length encoding or JPEG compression |
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which are hardly comparable to compression techniques typically called ''adaptive''.
[[Run-length encoding]] and the typical [[JPEG]] compression with run length encoding and predefined Huffman codes do not transmit a model.
A lot of other methods adapt their model to the current file and need to transmit it in addition to the encoded data, because both the encoder and the decoder need to use the model.
In adaptive coding, the encoder and decoder are instead equipped with a predefined meta-model about how they will alter their models in response to the actual content of the data, and otherwise start with a blank slate, meaning that no initial model needs to be transmitted. As the data is transmitted, both encoder and decoder adapt their models, so that unless the character of the data changes radically, the model becomes better-adapted to the data it is handling and compresses it more efficiently approaching the efficiency of the static coding.
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