Video Motion Detection - Axis IP-Surveillance system Design Manual

6.

Video motion detection

This section describes how video motion detection works in the network camera or video encoder and
how it functions with AXIS Camera Station.
The built-in video motion detection feature in Axis network cameras or video encoders is used to gener-
ate an alarm whenever movement occurs in the viewing area. You can configure a number of "included"
windows (a specific area in an image where you want motion to be detected), as well as "excluded"
windows (areas within an "included" window that should be ignored).
Figure 6a. Setting recording instructions using the network camera's or video encoder's video motion detection functionality.
When configuring for video motion detection, you can adjust the size of the window where you want
motion to be detected and drag the window to the desired position. You can then adjust sliders for the
object size (how large the object should be in order for the trigger to activate), history (how far back in
time the reference point for motion detection should be), and sensitivity (how big the pixel changes
should be in order to trigger an alarm).
Any detected motion within an active window is then indicated by red peaks in the activity window (the
active window has a red frame).
Once the video motion detection is configured, AXIS Camera Station will monitor the function and start
recording when the motion flag is raised by the network camera/video encoder. This is a very efficient
way of doing video motion detection as all the image processing is done by the network camera/video
encoder and not by the AXIS Camera Station server.
39