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data compression
ARC
CCITT
DCT
decoder
disk compression
DSP
JPEG
lossless compression
lossy compression
LZW
MNP
MP3
MPEG
ZIP

Storing data in a format that requires less space than usual. Compressing data is the same as packing data.

Data compression is particularly useful in communications because it enables devices to transmit the same amount of data in fewer bits. There are a variety of data compression techniques, but only a few have been standardized. The CCITT has defined a standard data compression technique for transmitting faxes (Group 3 standard) and a compression standard for data communications through modems (CCITT V.42bis). In addition, there are file compression formats, such as ARC and ZIP.

Data compression is also widely used in backup utilities, spreadsheet applications, and database management systems. Certain types of data, such as bit-mapped graphics, can be compressed to a small fraction of their normal size.



For internet.com pages about data compression, . Also, check out the following links!


More Information

Outstanding Page Advanced Compression Algorithms
Detailed explanations of facsmile compression standards, GIF, PNG, BMP, fractal image compression, and TIFF.

Outstanding Page Compression Pointers
Excellent collection of links to compression resources, research groups and companies.

Outstanding Page Optimizing Web Graphics
Webreference.com article on how to minimize file size and dithering for Web graphics. Includes sections on the color palette, color reduction, compression, tools and techniques, and several online references.

  CCITT compression schemes
Contains an explanation of CCITT Group 3 and Group 4 compression mechanisms. Updated on Mar 23, 1998

  Compression information page
Contains several archiver benchmark comparisons, archiver information and download links, and compression news. Updated on Nov 16, 1997

  Data Compression FAQ
Contains links to three FAQs about data compression.

  Data compression in branch office networks - white paper
Outlines data compression usage and benefits, advantages and shortcomings, differences between internal and external data compression solutions, and the most efficient data compression option for environments with mixed public and private framed data networks. Updated on Dec 8, 1997

  PKWARE Home Page
Provides news and information about PKWARE Inc., and their popular data compression utility PKZIP. Updated on Oct 28, 1997

  Video compression
Contains technical overviews of JPEG, MPEG and H.261standards. Updated on Aug 4, 1998

  Video over the Internet
Extensive paper on some of the problems, solutions and technologies, and products associated with streaming video on the Internet.

  Wavelet image compression
Provides information on Wavelet image compression, a mathematical compression method developed by the Houston Advanced Research Center. Updated on Dec 4, 1997

  WinZip Home Page
Offers a collection of information for the WinZip archive utility for Windows including ordering information, download links, and support and FAQs. Updated on Jun 27, 1998

  Yahoo!'s archiving and compression utilities for UNIX page
Yahoo!'s directory of links to shareware, resources, and utilities for data archiving and compression for UNIX systems. Updated on Aug 4, 1998

  Yahoo!'s compression page
Yahoo!'s directory of compression software, utilities, and companies. Updated on Aug 4, 1998

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