LZ78 - significado y definición. Qué es LZ78
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Qué (quién) es LZ78 - definición

LOSSLESS DATA COMPRESSION ALGORITHMS
LZ78; Lempel-Ziv; LZ77; LZ77 (algorithm); Lempel Ziv; LZ77 and LZ78 (algorithms); Lempel–Ziv; Lempel–Ziv coding; Lempel-Ziv coding; Data compression/LZ77 78; LZ1 compression; LZ2 compression; LZ compression; LZ77 & LZ78; LZ78 (algorithm); LZ1 (algorithm); LZ2 (algorithm)

LZ77 and LZ78         
LZ77 and LZ78 are the two lossless data compression algorithms published in papers by Abraham Lempel and Jacob Ziv in 1977 and 1978.
LZ compression         
LZ78 compression      
A substitutional compression scheme which works by entering phrases into a dictionary and then, when a reoccurrence of that particular phrase is found, outputting the dictionary index instead of the phrase. Several algorithms are based on this principle, differing mainly in the manner in which they manage the dictionary. The most well-known Lempel-Ziv scheme is Terry Welch's Lempel-Ziv Welch variant of LZ78. [comp.compression FAQ].

Wikipedia

LZ77 and LZ78

LZ77 and LZ78 are the two lossless data compression algorithms published in papers by Abraham Lempel and Jacob Ziv in 1977 and 1978. They are also known as LZ1 and LZ2 respectively. These two algorithms form the basis for many variations including LZW, LZSS, LZMA and others. Besides their academic influence, these algorithms formed the basis of several ubiquitous compression schemes, including GIF and the DEFLATE algorithm used in PNG and ZIP.

They are both theoretically dictionary coders. LZ77 maintains a sliding window during compression. This was later shown to be equivalent to the explicit dictionary constructed by LZ78—however, they are only equivalent when the entire data is intended to be decompressed.

Since LZ77 encodes and decodes from a sliding window over previously seen characters, decompression must always start at the beginning of the input. Conceptually, LZ78 decompression could allow random access to the input if the entire dictionary were known in advance. However, in practice the dictionary is created during encoding and decoding by creating a new phrase whenever a token is output.

The algorithms were named an IEEE Milestone in 2004. In 2021 Jacob Ziv was awarded the IEEE Medal of Honor for his involvement in their development.