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LZW |
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LZW (Lempel-Ziv-Welch) A data compression method that stems from techniques introduced by Jacob Ziv and Abraham Lempel. LZW has been used in many hardware and software products, including V.42bis modems, GIF, TIF and PDF files and PostScript Level 2. The LZ77 method creates pointers back to repeating data, while LZ78 creates a dictionary of repeating phrases with pointers to those phrases.The Welch in Lempel-Ziv-Welch is for Terry Welch, the Unisys researcher who created an enhanced version of these methods that was patented by Unisys. Unisys collected royalties from thousands of software publishers whose applications used this algorithm until the patents expired in 2004. This was the most widely licensed data compression patent in history. See PNG. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Topics include data preprocessing by sequential pattern mining for LZW, vowel and diphthong tutors for language therapy, an e-voting system for medium scale online elections, inferring acceptable arguments with answer set programming, and an ECMAScript compiler for the . The LZW graphics technology, that GIF is based on, is a legacy from the 1980s that Unisys inherited. A compression format developed by CompuServe using Unisys's patented LZW (Lempel-Ziv-Welch) technique, GIF files are bitmaps composed of individual pixels. |
LZW |
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