brightness difference

См. также в других словарях:

• difference — The magnitude or degree by which one quality or quantity differs from another of the same kind. alveolar arterial oxygen d. the d. or gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood : P( …   Medical dictionary

• Just-noticeable difference — In psychophysics, a just noticeable difference, customarily abbreviated with lowercase letters as jnd, is the smallest detectable difference between a starting and secondary level of a particular sensory stimulus.[1] It is also known as the… …   Wikipedia

• Just noticeable difference — In psychophysics, a just noticeable difference, customarily abbreviated with lowercase letters as jnd, is the smallest difference in a specified modality of sensory input that is detectable by a human being. It is also known as the difference… …   Wikipedia

• photometry — photometric /foh teuh me trik/, photometrical, adj. photometrist, photometrician /foh teuh me trish euhn/, n. /foh tom i tree/, n. 1. the measurement of the intensity of light or of relative illuminating power. 2. the science dealing with such… …   Universalium

• Main sequence — A Hertzsprung Russell diagram plots the actual brightness (or absolute magnitude) of a star against its color index (represented as B V). The main sequence is visible as a prominent diagonal band that runs from the upper left to the lower right.… …   Wikipedia

• Dale Purves — Born 11 March 1938 (1938 03 11) (age 73) …   Wikipedia

• magnitude — (mag)    1. a unit traditionally used in astronomy to express the apparent brightness of stars, planets, and other objects in the sky. For centuries, the brightest stars were said to be of the first magnitude, with fainter ones of the second… …   Dictionary of units of measurement

• threshold — 1. The point at which a stimulus first produces a sensation. 2. The lower limit of perception of a stimulus. 3. The minimal stimulus that produces excitation of any structure; e.g., the minimal stimulus eliciting a moto …   Medical dictionary

• Color–color diagram — In astronomy, color–color diagrams are a means of comparing the apparent magnitudes of stars at different wavelengths. Astronomers typically observe at narrow bands around certain wavelengths, and objects observed will have different brightnesses …   Wikipedia

• Dark slope streak — Slope Streaks in Acheron Fossae in 2010 …   Wikipedia

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