compression 音标拼音: [kəmpr'ɛʃən]
n . 压缩,压榨,缩小
n . 压缩
压缩,压榨,缩小压缩
compression 压缩
compression 压缩
compression 压缩
compression n 1 :
an increase in the density of something [
synonym : {
compaction },
{
compression }, {
concretion }, {
densification }]
2 :
the process or result of becoming smaller or pressed together ; "
the contraction of a gas on cooling " [
synonym :
{
compression }, {
condensation }, {
contraction }]
3 :
encoding information while reducing the bandwidth or bits required [
ant : {
decompression }]
4 :
applying pressure [
synonym : {
compression }, {
compressing }] [
ant :
{
decompressing }, {
decompression }]
Compression \
Com *
pres "
sion \,
n . [
L .
compressio :
cf .
F .
compression .]
1 .
The act of compressing ,
or state of being compressed .
"
Compression of thought ." --
Johnson .
[
1913 Webster ]
2 . (
Computers )
reduction of the space required for storage (
of binary data )
by an algorithm which converts the data to a smaller number of bits while preserving the information content .
The act of compressing [
3 ].
Note :
Compression may be {
lossless compression },
in which all of the information in the original data is preserved ,
and the original data may be recovered in form identical to its original form ;
or {
lossy compression },
in which some of the information in the original data is lost ,
and decompression results in a data form slightly different from the original . {
Lossy compression }
is used ,
for example ,
to compress audio or video recordings ,
and sometimes images ,
where the slight differences in the original data and the data recovered after {
lossy compression }
may be imperceptable to the human eye or ear .
The {
JPEG }
format is produced by a {
lossy compression }
algorithm .
[
PJC ]
74 Moby Thesaurus words for "
compression ":
abbreviation ,
abridgment ,
abstract ,
agglutination ,
apocope ,
astriction ,
astringency ,
bottleneck ,
cervix ,
circumscription ,
clamping ,
clamping down ,
clumping ,
clustering ,
coarctation ,
compactedness ,
compaction ,
compressure ,
concentration ,
concretion ,
condensation ,
consolidation ,
conspectus ,
constriction ,
constringency ,
contraction ,
contracture ,
crush ,
curtailment ,
decrease ,
densification ,
diminuendo ,
elision ,
ellipsis ,
epitome ,
foreshortening ,
hardening ,
hourglass ,
hourglass figure ,
isthmus ,
knitting ,
narrow place ,
narrowing ,
neck ,
nip ,
pinch ,
precis ,
press ,
pressure ,
puckering ,
pursing ,
recap ,
recapitulation ,
reduction ,
retrenchment ,
shortening ,
solidification ,
squeeze ,
squeezing ,
stranglement ,
strangulation ,
striction ,
stricture ,
summary ,
summation ,
syncope ,
synopsis ,
systole ,
telescoping ,
tightening ,
truncation ,
tweak ,
wasp waist ,
wrinkling 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 {algorithms } 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 /)}.
Web Content Compression FAQ
http ://perl .apache .org /docs /tutorials /client /compression /compression .html )}.
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 .
2004 -04 -26 )
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