4. Visibility models
4.1 Definition of visibility
Visibility, noted S, is of prime importance when considering evacuations, and depends on the level of contrast between an object and its surroundings. For an isolated object placed on a uniform background, the contrast C can be defined by the formula (7) . Under solar illumination conditions, the contrast of a black object placed on a white background is C = – 0.02
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Visibility models
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