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Brightness, luminance
| Light Glossary |
A measure of a surface`s or subject`s reflectivity in a given direction.
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Luminance, английский
- Brightness. in cctv refers to the part of the video signal that contains information about the scene brightness.
- Яркость. составляющая изображения, определяющая его относительную яркость в каждой точке экрана монитора
- This refers to the part of a video signal that carries the monochrome information. i.e. brightness information.
- Luminous intensity (photometric brightness) of any surface in a given direction per unit of projected area of the surface as viewed from that direction, measured in foot lamberts (fl).
- Luminous intensity (photometric brightness) of any surface in a given direction per unit of projected area of the surface as viewed from that direction, measured in footlamberts (fl).
- Refers to the video signal information about the scene brightness. the measurable,
- The part of a composite video signal that expresses brightness. also called y. separately transmitted in y/c (s-video).
- 1. luminous flux emitted, rejected, or transmitted per unit of solid angle per projected area of the source. 2. the photometric equivalent of brightness. 3. the brightness part of a television picture.
- Refers to the video signal information about the scene brightness. the measurable, luminous intensity of a video signal. differentiated from brightness in that the latter is nonmeasurable and sensory. the color video picture information contains two components, luminance (brightness and contrast) and chrominance (hue and saturation). the photometric quantity of light radiation.
- The luminous intensity of any surface in a given direction per unit of projected area of the surface, as viewed from that direction; a directional property of luminous radiation.
- The perceived brightness component of a given color, as opposed to its hue or its saturation.
- Яркость. относится к содержащейся в видеосигнале информации об освещенности объекта. фотометрическая единица измерения светового излучения.
- Ratio of a surface’s luminous intensity in a given direction to a unit of projected area. measured in candela per square meter.
- Photometric brightness of a light source defined by the density of its luminous intensity, measured as luminous flux per unit solid angle per unit area in a given direction. reported in candela per square meter (cd·m–2).
- Photometric brightness of a light source defined by the density of its luminous intensity, measured as luminous flux per unit solid angle per unit area in a given direction. reported in candela per square meter (cd/m2). compare illuminance. 504 glossary l-m luminous efficacy; luminous efficiency: ratio of the total luminous flux of a light source to the total radiant flux or to the power input.
- Photometric brightness of a light source as defined by the density of its luminous intensity. luminance is a measure of the luminous flux per unit solid angle per unit area in a given direction and is reported in candela per square meter (cd·m–2).
Luminance (or brightness), английский
A measure of flux reflected or emitted from a surface. it has
Luminance contrast, английский
The relationship between the luminance of an object and the luminance of the immediate background.
Luminance decay, английский
- Ослабление яркости. постепенное снижение относительной яркости экрана монитора с течением времени
- Ослабление яркости
Luminance factor, английский
- The ratio of the luminance of a surface or medium under specified conditions of incidence, observation, and light source to the luminance of a lossless, perfectly diffusing surface or medium under the same conditions. luminance meter, brightness meter a visual instrument or a photoelectric instrument used to measure luminance.
- Коэффициент яркости
Luminance of a surface, английский
Luminance ratio, английский
Luminance signal, английский
- That portion of the ntsc color television signal which contains the luminance or brightness information.
- That portion of the television signal which conveys the luminance or brightness information.
Luminance temperature, английский
Яркостная температура
Luminance threshold, английский
Порог яркости
Luminance variance, английский
Неравномерность яркости
Luminance., английский
Reflectivity, английский
- A measure of the fraction of incident radiation falling on a surface that is turned back from it by reflection. reflectivity also refers to the degree by which precipitation is able to reflect a radar beam.
- Отражательная способность
- Коэффициент отражения, отражательная способность
- Ability of a surface to reflect electromagnetic radiation, expressed as ratio r of the intensity of the total energy reflected from a surface to total radiation on that surface. for a perfect mirror, reflectivity r approaches 1.0; for a blackbody, the reflectivity is zero.
- Ability of a surface to reflect radiation, expressed as the ratio ? of the intensity of the total energy reflected from a surface to total radiation on that surface. for a perfect mirror, reflectivity r approaches 1.0; for a blackbody the reflectivity is 0. compare reflectance; reflection.
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Volts (v), английский
A measure of electrical "pressure." formula: volts = watts ÷ amps. tip: to save bucks and save face, check lamp-voltages before plugging in; and check overseas voltages before grabbing your passport.
Gray card, английский
A matte 18% reflectance card used instead of a subject for a reflected light meter reading. tips: exposure corrections for unusually light or dark subjects are the same as for an ilm - not an rlm. angle the card for typical but glare-free light. see: 18% assumption*.
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