IEVref:845-11-21ID:
Language:enStatus: Obsolete
Term: visual contrast threshold
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Definition: smallest contrast, produced at the eye of an observer by a given object, which renders the object perceptible against a given background

NOTE – For meteorological observations, the object must be rendered recognizable, and hence a higher threshold is to be expected. The value of 0.05 has been adopted as the basis for the measurement of meteorological optical range.


Publication date:1987
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