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Detector is  is a software object (part of the software environment) that represents an algorithm or a set of algorithms that allows you to analyze analyzing video and audio streams according to a predefined scenario and signal signals about the analysis results by creating events within the software environment.

Sub-detector is a detector that processes the data received from the parent detector.

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Also, the default detector list displays camera inputs (see Configuring the Input object) that you can use in an automatic rule.