TC620-PID
Page 84
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
.
VMD Alarm: Event window high/low mark
X = Event window size
Y = Event window high mark
Z = Event window low mark
VMD alarm becomes active when in at least Y out of X frames motion is detected.
VMD alarm becomes inactive when in at least Z out of X frames
no
motion is detected.
