Alarm: Motion
How Motion Detection Works
The way that the NVR looks for motion is quite straight forward
- it’s a process where it compares one frame (that is, a single
image taken approximately a 25th/30th of a second from the
previous image) with the next. A certain amount of “difference”
between these two “frames” is interpreted as motion.
As a result, the NVR is able to detect when there is a change
in the picture. However, this does not necessarily need to be
something moving in the frame. For example, a light being
turned on or off, a lightning flash or even the sun coming out
momentarily on a cloudy day might be enough to trigger the
motion detection on the NVR. However, as these events last
only a moment (and are relatively rare) they will only create a
few very short redundant clips, which will not take up too much
space or pose a problem with scanning through footage.
For this reason, don’t use PTZ systems and motion detection
simultaneously. The NVR will interpret the camera moving
as ‘motion’ and record. This is particularly true when using
Cruise Mode - as the camera is moving almost continually, so
too is the NVR recording almost continually!
Here, you’ll be able to set the motion detection features of
the NVR for each channel. We suggest that motion detection
is, under most circumstances, the most practical recording
method for the NVR to employ.
How it Works: Once motion detection has been enabled for a
channel, it will register to the NVR as a Motion Event. Thus,
you can use the Motion recording mode in the schedule to
trigger the NVR to record when motion detection triggers an
alarm signal.
Enable: Whether or not motion detection is enabled on a specific
channel. Each channel can be configured independently of one
another.
Motion Detection: Click the applicable Set button to setup the
motion detection area for that channel. See “Alarm: Motion
Detection Configuration” on page 39 for details on how to
do this, and what it means.
Say, for example, you are trying to monitor your front yard,
whilst in the background there is a busy street, and the cars
driving past continually set off the motion detection. What
can you do about it? Setting only part of the camera’s view to
be motion sensitive might be the answer. This is useful in a
number of circumstances, such as monitoring one particular
door at the end of a busy hallway, or a backyard with a tree that
keeps blowing in the wind.
Action: Here you can define what will happen when the camera
you’ve selected detects motion.
Note: If you’ve used the Copy-To feature to copy from one
camera to another, remember that you’ll still need to set the
Action for each channel independently - that information isn’t
copied.
If you’re planning to use Motion Detection as
the primary (or sole) recording mode for the
NVR, it’s worth taking a moment to ensure it’s
properly configured.
If the motion detection sensitivity is too
sensitive, then the NVR will record too
frequently or continually - any benefit of motion
detection will be lost.
If the motion detection sensitivity is not
sensitive enough, then the NVR will not record
when it should and may not record anything at
all.
We think that motion detection is the best way to
get your NVR to operate almost autonomously
for long periods of time (typically weeks to
months) without you having to worry about
losing old footage.
However, it can be important that it’s
configured correctly!
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