QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 114)

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3. Configure the IVA settings for video search.
a. Select the detection mode: Motion detection, Foreign object, Missing object, Out
of focus, or Camera occlusion. Multiple options can be selected.
b. Adjust the sensitivity for object detection.
c. Adjust the time interval for detecting the foreign objects and missing objects. If
a foreign object appears or a missing object disappears for a period of time which
is longer than the time interval, the NVR will record the event.
Note: The Interval slide bar appears only when ‘Foreign object’ or ‘Missing object’ is
selected.