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What (who) is eccentric compression - definition

CONCEPT IN COMPUTER DATA COMPRESSION

Asymmetric compression; Symmetric compression

eccentricity

WIKIMEDIA DISAMBIGUATION PAGE

Eccentric; Excentric; Eccentricity (disambiguation)

n.

1.

Deviation from circularity, ellipticity, oblateness, flatness, flattening.

2.

Distance from centre to focus.

3.

Irregularity, peculiarity, oddness, oddity, singularity, waywardness, strangeness, aberration.

Excentric

WIKIMEDIA DISAMBIGUATION PAGE

Eccentric; Excentric; Eccentricity (disambiguation)

·adj ·Alt. of Excentrical.

Eccentric

WIKIMEDIA DISAMBIGUATION PAGE

Eccentric; Excentric; Eccentricity (disambiguation)

·adj Not coincident as to motive or end.

II. Eccentric ·adj Pertaining to an eccentric; as, the eccentric rod in a steam engine.

III. Eccentric ·noun A circle not having the same center as another contained in some measure within the first.

IV. Eccentric ·noun One who, or that which, deviates from regularity; an anomalous or irregular person or thing.

V. Eccentric ·noun A circle described about the center of an elliptical orbit, with half the major axis for radius.

VI. Eccentric ·noun In the Ptolemaic system, the supposed circular orbit of a planet about the earth, but with the earth not in its center.

VII. Eccentric ·adj Deviating or departing from the center, or from the line of a circle; as, an eccentric or elliptical orbit; pertaining to deviation from the center or from true circular motion.

VIII. Eccentric ·adj Not having the same center;

- said of circles, ellipses, spheres, ·etc., which, though coinciding, either in whole or in part, as to area or volume, have not the same center;

- opposed to concentric.

IX. Eccentric ·adj Deviating from stated methods, usual practice, or established forms or laws; deviating from an appointed sphere or way; departing from the usual course; irregular; anomalous; odd; as, eccentric conduct.

X. Eccentric ·noun A disk or wheel so arranged upon a shaft that the center of the wheel and that of the shaft do not coincide. It is used for operating valves in steam engines, and for other purposes. The motion derived is precisely that of a crank having the same throw.

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.

https://en.wikipedia.org/wiki/Data compression symmetry