In mathematics, physics, and engineering, spatial frequency is a characteristic of any structure that is periodic across position in space. The spatial frequency is a measure of how often the structure repeats per unit of distance. The SI unit of spatial frequency is cycles per meter. In image processing applications, the spatial frequency often is measured as lines per millimeter, which is 1000 times smaller than the SI unit. Wikibooks Wikiversity has more about this subject: School of Mathematics Wikiquote has a collection of quotations related to: Mathematics Look up Mathematics in Wiktionary, the free dictionary Wikimedia Commons has media related to: Mathematics Inter. ...
Since antiquity, people have tried to understand the behavior of matter: why unsupported objects drop to the ground, why different materials have different properties, and so forth. ...
Engineering applies scientific and technical knowledge to solve human problems. ...
The International System of Units (abbreviated SI from the French language name SystÃ¨me International dUnitÃ©s) is the most widely used system of units. ...
Cycles are series of states or conditions that repeat themselves, usually after a regular or nearly regular period. ...
The metre, or meter (symbol: m) is the SI base unit of length. ...
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A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre. ...
In wave mechanics, the spatial frequency is related to the wavelength by The wave equation is an important partial differential equation which generally describes all kinds of waves, such as sound waves, light waves and water waves. ...
Likewise, the wave number k is related to spatial frequency and wavelength by Wavenumber in most physical sciences is a wave property inversely related to wavelength, having units of inverse length. ...
