User's Manual

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5.5.5.4 Missing Object
An alarm will be triggered when the selected target in the scene is taken away for the time longer
than the set duration.
The system analyzes static areas from the foreground, and determines whether it is missing object or
abandoned object from the similarity of its foreground and background. When the time exceeds the
set period, an alarm is triggered.
Applicable scenes: Scenes with sparse targets, no obvious and frequent light changes. For scenes with
intensive targets or too many obstacles, the missed alarm would increase; for scenes in which too
many people stay, the false alarm would increase. Keep the detection area texture as possible simple
as possible, because this function is not applicable to scenes with complex texture.
Step 1 Select Missing Object from the Rule Type list.
Figure 5-94 Missing object setting
Step 2 Click Draw Rule, and you can draw rules on the monitoring screen.
For parameter description, see Table 5-29.
Click Clear to the right of Draw Rule to clear all drawn rules.
Step 3 Configure missing object parameter.
Table 5-33 Description of missing object parameter
Parameter
Description
Duration
Configure the shortest time from the object disappearing to the alarm
being triggered.