Specifications
98
network video product and agged to the management software program for further actions to be
taken. This process oers a number of benets:
> It enables a more ecient use of bandwidth and storage space since there is no need for a
camera to continuously send video to a video management server for analysis of any
potential events. Analysis takes place at the network video product and video streams are
sent for recording and/or viewing only when an event occurs.
> It does not require the video management server to have a fast processing capability,
thereby providing some cost-savings. Conducting intelligent video algorithms is CPU
intensive.
> Scalability can be achieved. If a server were to perform intelligent video algorithms, only a
few cameras can be managed at any given time. Having the intelligent functionality “at the
edge”, i.e. in the network camera or video encoder, enables a fast response time and a very
large number of cameras to be managed proactively.
Figure 11.3d Event management and intelligent video enable a surveillance system to be constantly on guard in
analyzing inputs to detect an event. Once an event is detected, the system can automatically respond with actions
such as video recording and sending alerts.
Event triggers
An event can be scheduled or triggered. Events can be triggered by, for example:
> Input port(s): The input port(s) on a network camera or video encoder can be connected to
external devices such as a motion sensor or a door switch.
> Manual trigger: An operator can make use of buttons to manually trigger an event.
PIR
detector
Computer with video
management
software
Home
Office
INTERNET
Mobile
telephone
Video
recording
server
IP NETWORK
Relay
Alarm siren
Analog camera
Axis network
camera
CHAPTER 11 - VIDEO MANAGEMENT SYSTEMS