Item
Description
Frame rate divider
Range: [1...100]. Used to determine the number of frames used
for VMD. Only 1 divided by this value frames are evaluated.
Delay
Range: [1...10] frames. The delay in frames between the currently
processed frame and the stored frame with which it is to be
compared.
Event window size
Range: [1…32]. Number of frames evaluated at a time to
determine if there is a VMD alarm.
Event window low
mark
Range: [0…31]. Thresholds determining if there is a VMD alarm.
Event window high
mark
Feedback position
Enables you to position the detection window (not to be confused
with an event window).
Note on Advanced VMD Settings: Motion is detected by comparing the current frame with
a reference image (e.g. a previous frame) and calculating the difference between the two.
The value you enter for the Event window size parameter determines how many frames are
evaluated for VMD purposes at a time. Not all frames from the original video stream are
used for VMD. Only 1 divided by the value set for the frame rate divider frames are
evaluated.
A VMD event becomes active when, within the Event window, the number of frames with
motion exceeds a configurable value, the Event window high mark. After this, the VMD event
will remain active until the number of frames with motion drops below another configurable
value, the Event window low mark.
Video
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