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F-number
| Глоссарий по системам видеоохраны и видеонаблюдения |
- Указывает яркость изображения формируется объективом, контролируемые по радужной оболочке глаза. чем меньше f-число, тем ярче изображение.
- Indicates the brightness of the image formed by the lens, controlled by the iris. the smaller the f-number the brighter the image.
- In lenses with adjustable irises, the maximum iris opening is expressed as a ratio
- The standard measure of the lens aperture, which is the iris diameter, divided by the focal length of the lens. the lower the maximum aperture (f-number or f-stop), the more light that passes through the lens.
- In lenses with adjustable irises, the maximum iris opening is expressed as a ratio (focal length of the lens)/(maximum diameter of aperture). this maximum iris will be engraved on the front ring of the lens.
- The focal length of lens divided by its usable diameter. in the case of a laser, the usable diameter is the diameter of the laser beam or a smaller aperture which restricts a laser beam.
- In photography, the diameter of the aperture expressed in terms of the focal length of the camera lens. the greater the f-number, the less light reaches the film and the more in focus the objects in the foreground and the background will be. for example, with an f-number = 16 the objects in the far background will be in focus. whereas, with an fnumber = 2 the background will be blurry (while foreground objects are in focus). foad
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Апертура (относительное отверстие), русский
F-число, русский
Знаменатель относительного отверстия величина, русский
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Изображения, русский
Изображение, русский
- Изображение, вид, лик, икона, образ, картина, портрет, карточка, снимок, слепок, фигура, изваяние, кумир, статуя, бюст, силуэт; копия, подражание; описание, представление, проявление. ср. вид и рисунок. , картина, отражение, рисунок
- Картина, состоящая из точек пересечения лучей, выходящих из оптической системы, с некоторой поверхностью в пространстве изображений.
Brightness, английский
- Term for the intensity of illumination of a reproduced video picture.
- 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.
- 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
- 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.)
- In ntsc and pal video signals, the brightness information at any particular instant in
- Яркость
- 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).
- 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).
- 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.
- 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.
- A term mostly used in a qualitative way, related to the output power and beam quality of a laser; quantitatively
- 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.
- 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.
- That attribute of visual perception in accordance with which a surface appears to emit more light or less light. now called luminance.
- The amount of light that is emitted by a computer monitor or picture displayed on the monitor.
- Яркость. для видеосигналов систем ntsc и pal
Controlled, английский
- Управляемый; регулируемый
- Управляемый
- Подконтрольный (о предприятиях)
Adjustable, английский
- Регулируемый; переставной; корректируемый
- Zero, adjustable range регулируемый нуль, регулируемая дальность
- Настраиваемый; регулируемый adjustable arrayмассив переменной длины; массив с переменными границами
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Апертура (относительное отверстие), русский
Антикражевая ситема, русский
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