Area Transition Rule

Owned by Isabelle Avery (Unlicensed)
Last updated: Dec 06, 2023 by Charlotte Dakin-Norris
3 min read

 

Introduction

This rule checks for a track moving from one area to another within a specified period of time. The key advantage of this rule is that it does not necessarily have to be the same track. It works on the principal that if a track was in Area 1 and then the same or another track is detected in Area 2 within a specified time period, the rule will be considered broken, and an alarm will be raised.

This rule works with different tracks transitioning from Area 1 to Area 2 but keep in mind that this could be the same track that was lost and then reacquired with a new track Id. So this rule is tolerant of intermittent tracking but can still detect the progress of an intruder through a perimeter made up of layered alarm zones.

Contents

Configuration

 

NodesInputs

Track Sighting Input Rule Inputs | Track Sighting Input

Time Input Rule Inputs | Time Input

Checks

Area Check 1 Rule Checks | Area Check

Area Check 2

Link

Time Link Rule Checks | Time Link

The Time Frame stipulates how long we keep the output true from the first area check. This effectively means that if a track is detected in the second area within this the time period, then the alarm will be raised. In this example, the Time Frame is set to 26s.

Boolean Link: And Rule Checks | Boolean Link

Actions

Alarm Rule Actions | Alarm

Camera Rule Actions | Camera

PPI Example

The track must be move from Area 1 (blue) to Area 2 (purple) within the specified Time Frame of 26 seconds, otherwise the alarm will not be triggered.

As the target takes less than 26 seconds to reach Area 2 after leaving Area 1 the alarm is given.

Video

This video shows how to configure an Area Transition Rule and what happens when a track breaks that rule:

Related Information

Safety is everything.