The smoke density is described as the decrease of a local image contrast with the presence of
smoke as seen in the following graphic:
Figure 3.1: Smoke density definition
The effect of contrast reduction by smoke is described by the formula
with the contrast values for a temporal average image with smoke σ
s
and the contrast for the
background σ
bg
.
Exemplary images for smoke densities are shown in the following table:
AVIOTEC IP starlight 8000
System Overview | en 17
Bosch Sicherheitssysteme GmbH Operation manual 2017.06 | 6.0 | F.01U.318.200
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