9
Alarm: Motion Detection & Sensitivity
The way that the device looks for motion is quite straight forward - it’s a
process where it compares one frame with the next. A certain amount of
“difference” between these two “frames” is interpreted as motion. As a
result, the device 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. 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 prob-
lem with scanning through footage.
Channel:
Select the camera that you would like to alter.
Motion Detection:
Tap the Set button to setup the motion detection area
for that channel. You will see a grid of red boxes. The outlined boxes
mark the area that is sensitive to motion. The area without the red out-
lines is not sensitive to motion. Tap and drag to select the area you want
to select or de-select.
Sensitivity:
The Sensitivity setting is controlled by a slider, allowing you
to set a value between 0 and 50. The lower the number, the more sensi-
tive the motion detection will be. There are four time periods which you
can define different motion sensitivity values for. You can change what
time(s) each period starts and ends to best match the changing light-
ing conditions in your location. At night, you may get numerous false
triggers unless you raise the sensitivity setting, perhaps as high as 25 -
30. This is because when cameras use active infrared night vision, they
dramatically increase the gain controls to the image sensor. To find the
best sensitivity values for different times of day/night, it’s best to test the
system during different time periods. Get an able-bodied volunteer to
move about in front of the cameras you’d like to tune the sensitivity for.
The ideal sensitivity level is when your volunteer moving about always
triggers the motion detection, but there are no false triggers (or very
few) when your volunteer isn’t moving about.
Tap APPLY to save settings.
