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data compression
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Data Compression
In computing, techniques for reducing the amount of storage needed for a given amount of data. They include word tokenization (in which frequently used words are stored as shorter codes), variable bit lengths (in which common characters are represented by fewer bits than less common ones), and run-length encoding (in which a repeated value is stored once along with a count).
In lossless compression the original file is retrieved unchanged after decompression. Some types of data (sound and pictures) can be stored by lossy compression where some detail is lost during compression, but the loss is not noticeable. Lossy compression allows a greater level of compression. The most popular compression program is PKZIP, widely available as shareware.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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document reader
input form
magnetic-ink character recognition
mark sensing
optical character recognition
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redundancy (computing)
run-time system
sequential file
survey (statistics)
turnaround document
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