Luminance 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 centimetre or 10 kcd/m. Luminance is often used to characterize emission or reflection from flat, diffuse surfaces. The luminance
Random measure are measurable, so they are random variables. The distribution of a random measure is uniquely determinded by the distributions of for all continuous functions with compact support formula_41 on formula_57. For a fixed semiring formula_58 that generates formula_2 in the sense that formula_60, the distribution of a random measure is also uniquely determined by the integral over all positive simple formula_61-measurable functions formula_41. A measure generally might be decomposed as: Here formula_64 is a diffuse measure without atoms, while formula_65 is a purely atomic measure. A random measure of the form: where formula_67 is the Dirac measure, and formula_68 are