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
Pushforward measure Pushforward measure In measure theory, a discipline within mathematics, a pushforward measure (also push forward, push-forward or image measure) is obtained by transferring ("pushing forward") a measure from one measurable space to another using a measurable function. Given measurable spaces formula_1 and formula_2, a measurable mapping formula_3 and a measure formula_4, the pushforward of formula_5 is defined to be the measure formula_6 given by This definition applies "mutatis mutandis" for a signed or complex measure. The pushforward measure is also denoted as formula_9, formula_10, or formula_11. Theorem: A measurable function "g" on "X" is integrable with respect to the pushforward