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Was (wer) ist by compression - definition
CONCEPT IN COMPUTER DATA COMPRESSION
Asymmetric compression; Symmetric compression
lossy
DATA COMPRESSION APPROACH THAT RESULTS IN LOSS OR CHANGE OF SOME DATA
Lossy; Lossy encoding; Lossy data compression; Data compression/lossy; List of lossy compression methods; Irreversible compression
<algorithm> A term describing a data compression algorithm
which actually reduces the amount of information in the data,
rather than just the number of bits used to represent that
information. The lost information is usually removed because
it is subjectively less important to the quality of the data
(usually an image or sound) or because it can be recovered
reasonably by interpolation from the remaining data.
MPEG and JPEG are examples of lossy compression
techniques.
Opposite: lossless.
(1995-03-29)
Compression artifact
![Loss of edge clarity and tone "fuzziness" in heavy [[JPEG]] compression](https://commons.wikimedia.org/wiki/Special:FilePath/Sego lily cm-150.jpg?width=200 "Loss of edge clarity and tone \"fuzziness\" in heavy [[JPEG]] compression")
.png?width=200 "Block coding artifacts in a JPEG image. Flat blocks are caused by coarse quantization. Discontinuities at transform block boundaries are visible.")
NOTICEABLE DISTORTION OF MEDIA CAUSED BY THE APPLICATION OF LOSSY DATA COMPRESSION
Compression artefact; Compression artifacts; Block artifact; JPEG artifacts; JPEG artifact; Compression artefacts; JPEG compression artifacts; Mosquito noise; Datamoshing; Datamosh; JPEG artefacts; Mosquito artifact; JPEG artefact; Jpg artifacting; Jpeg artefacts; JPG artefacting; Lossy compression artefact; Lossy compression artifact; Data moshing; Video compression artifact; Image compression artifact; Artifact (compression)
A compression artifact (or artefact) is a noticeable distortion of media (including images, audio, and video) caused by the application of lossy compression. Lossy data compression involves discarding some of the media's data so that it becomes small enough to be stored within the desired disk space or transmitted (streamed) within the available bandwidth (known as the data rate or bit rate).
lossy
DATA COMPRESSION APPROACH THAT RESULTS IN LOSS OR CHANGE OF SOME DATA
Lossy; Lossy encoding; Lossy data compression; Data compression/lossy; List of lossy compression methods; Irreversible compression
¦ adjective
1. having or involving dissipation of electrical or electromagnetic energy.
2. Computing (of data compression) in which unnecessary information is discarded.
Wikipedia
Data compression symmetry
Symmetry and asymmetry, in the context of data compression, refer to the time relation between compression and decompression for a given compression algorithm.
If an algorithm takes the same time to compress a data archive as it does to decompress it, it is considered symmetrical. Note that compression and decompression, even for a symmetric algorithm, may not be perfectly symmetric in practice, depending on the devices the data is being copied to and from, and other factors such as latency and the fragmentation on the device.
In turn, if the compression and decompression times of an algorithm are vastly different, it is considered asymmetrical.
Beispiele aus Textkorpus für by compression
1. Doctors said the carpal tunnel syndrome is caused by compression of the median nerve, running from the forearm into the hand, at the wrist.
2. Alderton, 24, who was three months pregnant, was asphyxiated and Clennell, 24, was killed by "compression to the neck." Nicholls, 2', was the fifth victim.
3. Alderton, 24, who was three months pregnant, was strangled and Clennell, 24, was killed by "compression to the neck," police said.
4. A medical examiner determined that the death was consistent with asphyxiation caused by compression of the neck and chest, Conservation Officer Mark Farmer said.
5. Anneli Alderton, 24, was strangled and an unidentified woman was killed by "compression to the neck," detectives said as they appealed for help in one of Britain‘s biggest manhunts.