Noisy black
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In telecommunication, the term noisy black has the following meanings:
- In facsimile or display systems, such as television, a nonuniformity in the black area of the image, i.e., document or picture, caused by the presence of noise in the received signal.
- A signal or signal level that is supposed to represent a black area on the object, but has a noise content sufficient to cause the creation of noticeable white spots on the display surface or record medium.
See also: Noisy white
Source: from Federal Standard 1037C