Left and Removed Item Detection event settings

Processing mask

Draw a processing mask to determine what areas can trigger an event.

Alarm based on percentage of object inside alarm mask

Select if the event triggers rules based on the percentage of the object inside of the processing mask.

Alarm size

Define the maximum and minimum size of objects that can trigger the rule.

Alarm only if

Select to alarm only if there are multiple alarms in a specific time. You can define both the number of alarms and the time.

Or at least

Select to alarm if a number of pixels change in a specific time. You can define both the number of pixels and the time.