There
are several benefits to
Volume 23
using the site’s surveillance
system for intrusion detec-
tion:
May 2018 Edition
• The same cameras can be used
for detection and assessment
capabilities
• The per-video stream analytic
cost is very low, and
• Detection is not limited to just
the fence (i.e. the systems can
detect and potentially track in-
dividuals both inside and out-
side the perimeter)
However, if the implementa- A perimeter protected by a fence-mounted sensor. People approaching the fence are
tracked via a video analytic, enabling PTZ cameras to capture high resolution video of any
tion of video analytics is to be intrusion attempt.
successful (that is, provide a
high probability of detection
These practical considerations do not diminish the
while minimizing nuisance alarms), the following power of video analytics.
rule must be observed: video analytics work only
as well as the quality and coverage of their video On the contrary, when properly deployed and inte-
grated, video analytics offer an exciting new set of
streams.
capabilities that greatly enhance perimeter security
at relatively low cost:
This means that:
• For perimeter intrusion detection applications, fixed
cameras must have line of sight visibility of the entire
fence line.
• Cameras must be installed in such a way to avoid
movement and vibrations caused by wind.
• The cameras must be able to provide clear images un-
der low light situations. Weather conditions including
snow, rain and dense fog will affect visibility and detec-
tion capabilities.
• Video analytics typically require buffer space around
the detection area that may be impractical in busy
environments, such as urban areas with adjacent side-
walks.
• The algorithms must be optimized for outdoor use and
be able to distinguish between people/objects of inter-
est and background noise like shadows or vegetation
movement.
• Supplement fence sensors by providing additional de-
tection capabilities (especially important for low fenc-
es, ornamental fences, and walls)
• Determine the direction of intrusions (ingress or
egress)
• Provide covert detection (no visible equipment on
fence)
• Detect and track people near both sides of the perime-
ter fences to provide early warning of potential security
events before they can occur.
• This early warning can be used to direct PTZ cameras,
so that high-resolution video can be captured of the in-
truder at the time the alarm (from the fence sensor) is
generated
• Use anti-loitering analytics to detect persons “camped
out” near the perimeter
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