Глоссарий

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20 июля, 2015

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Albedo

Глоссарий по астрономии
    The ratio of the amount of light reflected by an object and the amount of incident light; a measure of the reflectivity or intrinsic brightness of an object (a white, perfectly reflecting surface would have an albedo of 1.0; a black perfectly absorbing su




Reflectivity, английский
  1. 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.

  2. Отражательная способность


Brightness, английский
  1. Term for the intensity of illumination of a reproduced video picture.

  2. The attribute of visual perception in accordance with which an area appears to emit or reflect more or less light (this attribute of color is used in the color model hsb - hue, saturation, brightness). see lightness.

  3. A term to indicate the relative amount of light intensity available. brighter is more light, dimmer is less light. in an infrared system, the brightness control may affect actual image intensity or it may change the temperature range displayed. either eff

  4. The attribute of visual perception in accordance with which an area appear to emit more of less light. (luminance is the recommended name for the photo-electric quantity which has also been called brightness.)

  5. In ntsc and pal video signals, the brightness information at any particular instant in

  6. Яркость

  7. The value of a pixel in an electronic image, representing its lightness value from black to white. usually defined as brightness levels ranging in value from 0 (black) to 255 (white).

  8. In ntsc and pal video signals, the brightness information at any particular instant in a picture is conveyed by the corresponding instantaneous dc level of active video. control is an adjustment of setup (black level, black reference).

  9. Is strictly defined as an attribute of a visual sensation according to which an area appears to emit more or less light. we sometimes misuse the term brightness in this catalog instead of the more correct “luminance.” luminance, used for sources, is the luminous flux in an elemental beam from a given point per unit area per solid angle in the specified direction.

  10. The visual sensation of the luminous intensity of a light source. the brightness of a laser beam is most closely associated with the radiometric concept of radiance.

  11. A term mostly used in a qualitative way, related to the output power and beam quality of a laser; quantitatively

  12. The luminance of objects. the brightness of any area of the subject is dependent on how much light falls on it and how reflective it is. brightness range is the relationship we perceive between the light and dark subjects in a scene. brightness contrast is a judgment of the relative measure of that range, such as high, low, or normal. brightness values are sometimes referred to as ev (exposure values), a combination of aperture and shutter speed. brightness values in the scene are translated to tonal values on film.

  13. Value of a pixel in a digital image giving its value of lightness from black to white, with o being black and 255 being white.

  14. That attribute of visual perception in accordance with which a surface appears to emit more light or less light. now called luminance.


Reflecting, английский

Antipodal point, французский
    The point that is directly on the opposite side of the planet


Adams, john couch 1819-1892, французский
    English astronomer and mathematician who, at the age of 24, was the first person to predict the position of a planetary mass beyond uranus. but, unfortunately, adams did not publish his prediction. galle confirmed the existance of neptune based on indepen