20 en | Planning AVIOTEC IP starlight 8000
2019.01 | 10 | F.01U.318.200 Operation manual Bosch Sicherheitssysteme GmbH
4 Planning
A fire safety analysis should be performed to determine the characteristics of the area
including a fire load calculation. The placement of the camera or cameras results from the
application environment of the customer.
4.1 Influencing factors at the installation site
You can influence some factors that might disturb the video-based fire detection algorithm. If
you consider these conditions during the planning phase, you will minimize the probability of
false alarms. The following information is very important to achieve an environment optimized
for better and faster detection. Choose carefully the position of the camera by considering the
following values:
Influencing factor Countermeasure Information
ILLUMINATION Take care of a well
illuminated environment. Use
a luxmeter to determine the
illumination values (see
Illumination, page 8).
A well and evenly illuminated
environment is important to
achieve better image quality
and therefore a better base
for analyzing the video image.
DYNAMIC RANGE The dynamic range in the
detection area must be equal
or less than factor 5. Use a
luxmeter to determine the
illumination values. These
values have to be collected
successively in the same
scene.
The dynamic range represents
the ratio between the
minimum and maximum
brightness in the
environment.
BACKLIGHT Avoid backlights in the video
image by:
– Changing the camera
position and monitor in
another direction.
– Changing the horizontal
and/or vertical tilt angle.
– Excluding windows and
roof lights from the field
of view of the camera.
Backlights create bright areas
in the video image and can
lead to false alarms. Due to
the high dynamic range
resulting from the backlight,
fires may not be detected.
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