資料來源 : pyDict
壓縮,壓榨,縮小壓縮
資料來源 : Webster's Revised Unabridged Dictionary (1913)
Compression \Com*pres"sion\, n. [L. compressio: cf. F.
compression.]
The act of compressing, or state of being compressed.
``Compression of thought.'' --Johnson.
資料來源 : WordNet®
compression
n 1: an increase in the density of something [syn: {compaction},
{concretion}, {densification}]
2: the process or result of becoming smaller or pressed
together; "the contraction of a gas on cooling" [syn: {condensation},
{contraction}]
3: encoding information while reducing the bandwidth or bits
required [ant: {decompression}]
4: applying pressure [syn: {compressing}] [ant: {decompression}]
資料來源 : Free On-Line Dictionary of Computing
compression
1. (Or "compaction") The coding of data to save
storage space or transmission time. Although data is already
coded in digital form for computer processing, it can often be
coded more efficiently (using fewer bits). For example,
{run-length encoding} replaces strings of repeated characters
(or other units of data) with a single character and a count.
There are many compression {algorithms} and utilities.
Compressed data must be decompressed before it can be used.
The standard {Unix} compression utilty is called {compress}
though {GNU}'s superior {gzip} has largely replaced it. Other
compression utilties include {pack}, {zip} and {PKZIP}.
When compressing several similar files, it is usually better
to join the files together into an {archive} of some kind
(using {tar} for example) and then compress them, rather than
to join together individually compressed files. This is
because some common compression {algorithm}s build up tables
based on the data from their current input which they have
already compressed. They then use this table to compress
subsequent data more efficiently.
See also {TIFF}, {JPEG}, {MPEG}, {Lempel-Ziv Welch},
"{lossy}", "{lossless}".
{Compression FAQ
(ftp://rtfm.mit.edu/pub/usenet/news.answers/compression-faq/)}.
{Usenet} newsgroups: {news:comp.compression},
{news:comp.compression.research}.
2. Reducing the dynamic range of an audio signal,
making quiet sounds louder and loud sounds quieter. Thus,
when discussing digital audio, the preferred term for reducing
the total amount of data is "compaction". Some advocate this
term in all contexts.
(2001-01-30)