Bosch AVIOTEC IP starlight 8000 Operation And Commissioning Manual page 16

16 en | System Overview AVIOTEC IP starlight 8000
σ σ
BG S
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 and the contrast for the
s
background σ .
bg
Exemplary images for smoke densities are shown in the following table:
2020.08 | 01 | F.01U.391.015 Operation and Commissioning Manual Bosch Sicherheitssysteme GmbH