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  • Contrast sensation — is a human ability to distinguish objects which scarcely stand out against a background. Contrast sensation is evaluated on the basis of sinusoidal grids.Fact|date=November 2007 The increased threshold of contrast sensation may be a symptom of… …   Wikipedia

  • background — [bak′ground΄] n. 1. the part of a scene or picture that is or seems to be toward the back 2. surroundings, esp. those behind something and providing harmony or contrast; surface against which something is seen 3. a less important or unobtrusive… …   English World dictionary

  • Contrast (vision) — Left side of the image has low contrast, the right has higher contrast …   Wikipedia

  • Contrast effect — A contrast effect is the enhancement or diminishment, relative to normal, of perception, cognition and related performance as a result of immediately previous or simultaneous exposure to a stimulus of lesser or greater value in the same dimension …   Wikipedia

  • Contrast (statistics) — In statistics, particularly analysis of variance, a contrast is a linear combination of two or more factor level means (averages) whose coefficients add up to zero.[1][2] A simple contrast is the difference between two means. A contrast may be… …   Wikipedia

  • contrast medium — Med. a radiopaque substance injected into a part of the body, as the stomach or duodenum, to provide a contrasting background for the tissues in an x ray or fluoroscopic examination. [1950 55] * * * Substance comparatively opaque to X rays, which …   Universalium

  • contrast — {{Roman}}I.{{/Roman}} noun ADJECTIVE ▪ clear, marked, sharp, stark, strong ▪ There is a stark contrast between the lives of the rich and those of the poor. ▪ complete …   Collocations dictionary

  • Contrast transfer function — Typical contrast transfer function observed from an electron micrograph The contrast transfer function is a type of optical transfer function that affects images collected in an transmission electron microscope. The contrast transfer function… …   Wikipedia

  • Background light — The background light is used to illuminate the background area of a set. The background light will also provide separation between the subject and the background. In the standard 4 point lighting setup, the background light is placed last and is… …   Wikipedia

  • contrast — 1. noun /ˈkɒntrɑːst,ˈkɑntræst,kənˈtrɑːst,kənˈtræst,ˈkɑntræst/ a) A difference in lightness, brightness and/or hue between two colours that makes them more or less distinguishable. The red and the orange dont have much contrast between them mdash; …   Wiktionary

  • Contrast-to-noise ratio — Haze over Kuala Lumpur. Contrast to noise ratio (CNR) is a measure used to determine image quality. CNR is similar to the metric, signal to noise ratio (SNR), but subtracts off a term before taking the ratio. This is important when there is a… …   Wikipedia

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