Lempel–Ziv–Welch (LZW)
LZW achieves compression by creating a string table and using shorter codes to represent longer strings. LZW compression algorithm It is a patent of Unisys and is valid until 2003, so its use is limited. The correspondence between strings and encodings is dynamically generated during the compression process and is implicit in the compressed data. It is calculated according to the table when decompressing Recovery is a kind of lossless compression. According to the compression algorithm of Lempel-Ziv-Welch Encoding, referred to as LZW, it can be implemented in any Chinese language.