29 September 2022 - Tom Opio

Featured in: Product information and OPTEX tech tips, Tech Tip, Intrusion detection

Our ONVIF compliant LiDAR REDSCAN Pro series allows the ability to create alerts based on specific detection criteria or logic. Alarms can be raised based on the sequence of zone detection or based on detection in multiple zones. One zone would be considered as ‘judgement zone’ and the second as ‘alert zone’. With this REDSCAN Pro can generate smart alerts dynamically by processing both ‘judgment zone’ and ‘alarm zone’ status.

Getting started: Zones allocation for dynamic event filtering

The zones are separated by letters and numbers, A for alert zone and B for the judgment zone.

  • To set the alert zone, choose from: A11, A12, A21 or A22.
  • To set the judgement zone, choose from: B11, B12, B21 or B22


What can dynamic event filtering be used for and how to configure it

There are many applications of dynamic event filtering and each requires a certain configuration. Some of the most common applications are explained here.

Directional tracking protection

If there is a requirement to only allow movement in one direction REDSCAN Pro is able to generate alarms for movement in the unwanted direction and no alarm when a person goes in the desired direction. One example of this application would be an exit only walkway.

For this application, REDSCAN Pro is installed in horizontal mount and the alarm and judgment zones are allocated to suit the site requirement. Set detection target for both alarm and judgment zones to ‘mobile object’ then apply the setting as in the table below:

Tech tip dynamic event
Event filterDirectional tracking protection
Mount modeHorizontal
Detection targetMobile object
ActionAdvance
Judgement processingOnce
Alert hold-off periodAny value as required

Alerts for un-audited entry when a security guard is absent

Minimum height limit requirements at the loading bay

In this example, there is a requirement for an alert when a person enters a zone and the security guard is not on location; there is no alert when the security guard is present.

REDSCAN Pro is mounted horizontally and we set the security guard standing area as judgement zone and entry area as an alert zone. Both alert and judgment zone detection target need to be set to ‘presence’ and apply dynamic event filtering settings as below.

Event filterGuard absence protection
Mount modeHorizontal
Detection targetPresence
ActionSuppress
Judgement processingAlways
Alert hold-off periodAny value as required
Judgement timeAny value as required

Tunnel protection

Tech tip dynamic event security guard

Parked car protection

In this application, an alert is raised if a small car or van approaches a truck loading bay and there would be no alert for big trucks. The REDSCAN Pro is installed in vertical mount generating a virtual wall parallel to the loading bays.

The area above the minimum required height is set as ‘judgment zone’ and area below the minimum height as ‘alert zone’. To avoid false alarms by staff walking through the detection area, the minimum target size can be set to be reasonably large to ensure there is no alert when a person walks past this point.

Event filterMinimum height requirement
Mount modeVertical
Detection targetPresence
ActionSuppress
Judgement processingOnce
Alert hold-off periodAny value as required
Judgement extension timeGreater than 2
Tech tip dynamic event loading bay height
Parked car tech tip

Contact our tech team to find out more about REDSCAN Pro and discuss your specific application.

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The REDSCAN Pro dynamic filtering feature can be used for rail tunnel entry protection to ensure there is an alert if a person walks into the tunnel but no alerts for trains. The REDSCAN Pro can be installed in a vertical mount to generate a virtual door in the tunnel entrance.

The detection minimum target size is set to a value small enough to detect a person and maximum detection target size to include train width. We set the area above 2 m as ‘judgment zone’ and area in the tunnel entry below 2 m as ‘alert zone’. The judgement extension parameter is used to allow for a small time window when the nose of the train is detected in the alert area before the top of the train detection in the judgment area.

Event filterTunnel protection
Mount modeVertical
Detection targetPresence
ActionSuppress
Judgement processingOnce
Alert hold-off periodGreater than 0
Judgement extension timeGreater than 0
Tech tip dynamic event tunnel protection

In this application there is a requirement for an alert when a person approaches an area while a car is parked, but no alert when there is no car

The REDSCAN Pro is installed in a horizontal mount. We set the location where the car is normally parked as ‘judgment zone’ and all the areas around the parked car as ‘alert zone’. It is recommended to set the judgment zone to be just large enough for the parked car. Set the minimum target size to be small enough to detect a person and large enough to include a car as a target.

Event filterParked car protection
Mount modeHorizontal
Detection targetPresence
ActionAdvance
Judgement processingOnce
Alert hold-off periodAny value as required
Judgement timeAny value as required

Watch the following video about REDSCAN Pro LiDAR dynamic event filtering applications

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