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Astigmatism
| CCTV glossary (глоссарий терминов по видеонаблюдению) |
- The uneven foreground and background blur that is in an image.
- A lens aberration that causes off-axis light bundles to focus to an elliptical, rather than circular, spot.
- Astigmatismo
- A condition where a misshaped cornea causes light to be focused over a range of distances rather than on a point. this can be corrected by a lens with cylinder power in a certain direction.
- A condition in which the eye cannot focus vertical and horizontal lines simultaneously, leading to blurring of vision
- Астигматизм
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Astigmatismo, испанский
Астигматизм, русский
- (от a - отрицательная приставка и греч . stigme - точка), искажение изображения оптической системой, связанное с тем, что преломление (или отражение) лучей в различных сечениях проходящего светового пучка неодинаково. вследствие астигматизма изображение предмета становится нерезким. каждая точка предмета изображается размытым эллипсом. астигматизм глаза устраняется с помощью очков с цилиндрическими стеклами, контактных линз.
- Один из видов аберраций, проявляющийся в том, что изображение точки, расположенной на оптической оси, представляет собой два взаимно перпендикулярных отрезка прямой линии, расположенных на некотором расстоянии друг от друга
- Тип аберраций, при котором для внеосевого пучка не совпадают точки фокусов в меридиональной и сагиттальной плоскостях (лучи бесконечно узкого пучка не сходятся в одной точке.
Астигматизм одна из аберраций, русский
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Foreground, английский
- Dark foregrounds help hold the eye within the frame and increase the illusion of depth. bright foreground objects, especially out-of-focus or moving ones, can be distracting. tip: back or side-light the foreground using little or no fill. also see: frame.
- The brush color of displayed characters and graphics, for example, the color of the text that is displayed in a textbox control.
Background, английский
- Фон
- The surface area against which the pattern is contrasted. the surface area of
- The portion of a scene that sits behind the main, foreground subject. the background can be made sharp or unsharp through the use of selective focusing techniques and depth of field manipulation.
- A фоновый; внеязыко- вой knowledge
- Sound or noise that interferes with radio or sonar reception.
- Фон, задний план о ~ for
- A page that you can assign to another page to create multiple layers in a drawing.
- In a graphical user interface such as windows, a pattern or picture in the screen background that can be chosen by the user.
- The area on a card that allows a user to make the card’s image a background when clicked on.
- The area that appears behind the tiles on the start screen.
- The color or image that appears behind the content of a visual element, for example, behind the text that is displayed in a textbox control or on your graphical user interface.
- The image that appears in the conversation window.
- The picture that appears in the photos hub.
- Formations on or signals from a test object that constitute the background to a discontinuity. the higher the level of background noise, the more difficult it is to distinguish a discontinuity. background signals may arise from visual, acoustic, chemical, electrical, or radiation sources that the sensor responds to. see also sensitivity; signal-to-noise ratio.
- Formations on or signals from a test object that constitutes the background to a discontinuity. the higher the level of background noise, the more difficult it is to distinguish a discontinuity. background signals may arise from visual, acoustic, chemical, electrical or radiation sources that the sensor responds to. see also neural acuity; sensitivity; signal-to-noise ratio.
- Formations on, or signals from, a test object that constitute the background to a discontinuity. the higher the level of background noise, the more difficult it is to distinguish a discontinuity. see also background fluorescence; neural acuity; sensitivity; signal-to-noise ratio. glossary b 491
- In magnetic particle testing, the appearance or brightness of the surrounding area acting to reduce the contrast of an indication. (2) nonrelevant signal that tends to interfere with the normal reception or interpretation of the target being sought.
Aberration, английский
- A term from optics that refers to anything affecting the fidelity of the image in regards
- A term from optics that refers to anything affecting the fidelity of the image in regards to the original scene.
- A distortion of image quality or color rendition in a photographic image caused by optical limitations of the lens used for image capture. aberrations commonly show up in the form of halation around high-contrast portions of the image, or “smearing” of color toward the edges of the frame. aspheric lens surfaces and advanced lens coatings are often used in more expensive or complex lenses as a means of reducing aberrations. for more on this subject, see the explora article, “optical anomalies and lens corrections explained.”
- Any flaw introduced during the manufacturing or grinding of a spectacle lens that can result in image blur. it may be inherent in the lens design or may result from an error in processing.
- An action or growth which is not usual or expected
- An apparent change of place, or alteration of their mean position, in the fixed stars, caused by the earth`s orbital movement.— aberration of a planet signifies its progressive geocentric motion, or the space through which it appears to move, as seen from the earth, during the time which light occupies in passing from the planet to us.—crown of aberration is a spurious circle surrounding the proper disc of the sun.—constant of aberration, or amount of displacement in the sun`s longitude, arising from
- In celestial navigation, the apparent displacement of a heavenly body due to the observer’s motion.
Elliptical, английский
Эллиптический (о маршруте ожидания)
Horizontal, английский
- Горизонталь; горизонтальный
- Горизонталь; горизонтальный 287
- At right angles to the direction of gravity; on the level; parallel to the horizon; neither vertical nor inclined.
- A direction parallel to the horizon, or what is commonly termed lying flat. one of the greatest inconveniences navigators have to struggle with is the frequent want of a distinct sight of the horizon. to obviate this a horizontal spinning speculum was adopted by mr. lerson, who was lost in the victory man-of-war, in which ship he was sent out to make trial of his instrument. this was afterwards improved by smeaton, and consists of a well-polished metal speculum about 3-1/2 inches in diameter, inclosed within a circular rim of brass, so fitted that the centre of gravity of the whole shall fall near the point on which it spins. this is the end of a steel axis running through the centre of the speculum, above which it finishes in a square for the convenience of fitting a
Simultaneously, английский
Adv одновре- менно
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Plumbicon., английский
Thermionic vacuum tube developed by philips, using a lead oxide photoconductive
Slow scan., английский
The transmission of a series of frozen images by means of analog or digital signals
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