SafeZone-2D (SZ-2D) can run in one of two analysis modes (how it performs its analysis), and has two detection modes (what it should look for). These can be used in any combination.
Analysis modes:
Sterile Zone – quiet locations that do not normally
expect movementPublic Safety – busy locations that have consistent
movement
Detection modes:
Detect moving – look for moving object in the scene
Detect stationary – look for objects that stay/loiter in the scene.
Analytics mode - Sterile Zone
When to use: In areas that are normally quiet.
In this mode SZ-2D will quickly analyse the scene to learn what is classed as ‘background’ - this can include trees and plants moving in the wind. It will then safely ignore all background elements (reducing false alarms) and focus on objects that enter the foreground.
It is capable of determining if there is camera movement, where it will disable analysis while it re-learns the background scene.
Use cases with Detect Moving:
Detecting individuals or vehicles entering a quiet area
Use cases with Detect Stationary:
Detecting cars who park in unexpected locations (e.g. fly tipping)
Detecting individuals who stop for an extended period at a building entrance
Analytics mode – Public Safety
When to use: In areas that have consistent movement, such as public spaces.
In Public Safety mode SZ-2D is considerably more sensitive than Sterile Zone mode. It reduces the use of background analysis to eliminate false alarms and has been tailored to more accurately find objects in busy scenes. In this mode it is crucial to set the detection sizes appropriate to the kind of object to be detected (e.g. a person, group or vehicle).
The camera should be installed securely to minimise/eliminate camera movement as the increased sensitivity of Public Safety can trigger false alarms with camera wobble.
Use cases with Detect Moving:
Detecting vehicles in a pedestrian zone, by setting the desired object size to detect large objects in the scene.
Detecting groups of people, by setting the desired object size to detect large objects in the scene.
Use cases with Detect Stationary:
Detecting loiterers in a pedestrian zone
Additional options - false alarm mitigation
Headlights/vehicles in scene
SafeZone 2D can perform additional analysis to determine when vehicle headlights (or other light sources) passing nearby causes the scene to suffer a sudden increase in brightness.
Insects/droplets on lens
After detecting an object, SafeZone 2D can perform an additional check to determine if it is out-of-focus – a common characteristic of items very close to the camera lens such as spiders and insects drawn to a camera’s IR lamps, or water droplets running down the lens. It is possible to set a sensitivity – values 3 and below won’t affect positive detections, while higher values may have a small effect on detection performance).
Activation minimum presence (seconds)
How long an object should be moving/stationary before SafeZone 2D will consider an object meets the desired criteria. Be aware that in Detect Stationary mode SafeZone 2D requires 8 seconds to initially detect an object is stationary – this is on top of any additional minimum presence time requested. For this reason values above 5 seconds are not recommended.