Avitech Rainier 3G Plus, Руководство пользователя

Страница: 103 / 147

97
Image
Video Detect Area
(L/T/R/B, %)
Change . . .
Freely adjust the horizontal ( L eft and R ight) and vertical ( T op and B ottom)
markers to set the scope of area to be monitored
for an occurrence of “no
video”.
Note: This item is only available when the previous item is set On .
If the Safe Area item has been previously set, Video Alarm will
temporarily use the mask area border to help set the Video Alarm .
Threshold
(mV
/ IRE)
(0 to 140 for mV)
(0 to 20 for IRE)
Set the brightness level (IRE/mV) of the “detect area” below which the
signal will be considered to be black.
Note: IRE/mV unit will depend on the choice in
“System”

“Option”

“General”

“Video black threshold unit”.
Set Duration
(1 to 255 seconds)
Set the “video black” alarm response time (seconds). If the “video black”
alarm feature is triggered, the alarm will be activated after the amount of
time set here.
Video Freeze
Enable
(On / Off)
Activate the “video freeze” alarm feature. Freeze detection is done by
comparing successive frames based on the parameters set on the next 2
items (Sensitivity Level and Set Duration).
Note: Analog input signal is not supported.
Sensitivity Level
(1 to 128)
Set the motion sensitivity of the image when “video freeze” alarm will be
triggered. Adjust the sensitivity according to the signal being monitored,
on a range of
1 (for filtering out the noise in a noisy signal) to 128 (for a
clean signal). If the “sensitivity” level is set very low, a lack of any change
in frame by frame content comparison in the “detect area” (e.g., a talk
show video where the background is constant and the only motion
detectable is the announcer’s lip movement) may trigger the alarm. In this
case consider increasing the “sensitivity level” or “set duration” (next
item) values.
Set Duration
(5 to 255 seconds)
Set the time interval to wait before activating the “video freeze” alarm
once the criteria (sensitivity level) for the alarm has been detected.
Note: It may take up to one second more than the value of the
“Set
Duration
” parameter to trigger a video freeze alarm.
The Video Black alarm (no video) and the Video Freeze alarm cannot happen simultaneously. If both
alarms are enabled, and both alarms are triggered, the Video Black alarm will be activated, as it has the
higher priority.
Likewise, both functions are not available for analog input signal.
Image
Border
Red Color
(On / Off)
Enable the image border to change to the color Red when a video alarm is
activated