Luminance while imaging luminance meters measure luminance in a way similar to the way a digital camera records color images. Luminance Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted or reflected from a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m). A non-SI term for the same unit is the nit. The CGS unit of luminance is the stilb, which is equal to one candela per square
Lebesgue measure is translation-invariant, but not complete. The Haar measure can be defined on any locally compact group and is a generalization of the Lebesgue measure (R with addition is a locally compact group). The Hausdorff measure is a generalization of the Lebesgue measure that is useful for measuring the subsets of R of lower dimensions than "n", like submanifolds, for example, surfaces or curves in R and fractal sets. The Hausdorff measure is not to be confused with the notion of Hausdorff dimension. It can be shown that there is no infinite-dimensional analogue of Lebesgue measure. Lebesgue measure In measure theory,