Difficulty: starter
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Learning Objectives
After reading this article, you’ll be able to:
Understand XOVIS's people counting
Define if XOVIS’s data types suit your use case
What is Xovis?
The XOVIS sensors detect people flow across a(n imaginary) traffic line, and send analytics data over a secure, encrypted network connection.
Traffic Line areas are intended to track traffic going in and coming out of a specific location. They produce information such as “In the last update period, 5 people crossed the Traffic Line going IN to the area, 3 people crossed the line going OUT”. The delta, or difference, between these two values provides us with the information on how many people are still in the tracked area (utilization).
How does it work?
Non-intrusive solution
All of the image processing is done on the sensor itself, the sensor does not store or output images, and has no interface to extract images, so privacy is fully protected.
Data is only transmitted in text format and without any kind of personally identifiable information.
The functionality of Xovis 3D stereo vision sensors is based on two optical CMOS image sensors arranged at a certain distance to each other. The images are compiled to a stereo image in real time on the device. The processed images are not stored. Neither will these images leave the sensor at any time during operation. Only metadata, such as count metrics, timestamp, or path coordinates is pushed from the sensor.
Pixel lock
All Spacewell Xovis devices come with Pixel Lock: an irreversible function that applies a filter to all scene images right after the embedded processing.
People can be clearly seen, but not recognized.
Documents or screens are impossible to read.
Edges are kept sharp, to allow accurate placement of geometries or stitch sensors for wide entrances.
It is not possible to reproduce a sharp image anymore based on the Pixel Lock image.
How often is data captured?
Technically, the sensor is always on and could update the Workplace platform as soon as a detection has occurred.
As a default, the data is uploaded into the Workplace Cloud every 1 min: this interval is low enough, that a person will be captured, yet it also reduces false detection issues.
How is data treated?
When a XOVIS device is configured using Footfall, the footfall data will be visualized on https://spacewell.atlassian.net/wiki/spaces/KB/pages/159973452/Live+Data+floorplan#View-by Footfall IN/ Footfall OUT + Footfall TOTAL.
The difference between Traffic IN and Traffic OUT indicates how many people are still inside the location. This value is calculated and is used as (indirect) Utilization value. (see https://spacewell.atlassian.net/wiki/spaces/KB/pages/492545/Utilization+Occupancy+Matrix#Indirect-Utilization-&-Occupancy)
The calculated/ indirect Utilization value
real time data can be visualized in the Live Floorplan View By Space > "Utilization".
historical data can be visualized in the Replay - Timelapse and in the Space monitor dashboard.
In theory, the traffic line counter just continues counting. Because of the use cases within the Workplace platform (know daily flux of people coming in and going out; and indirect utilization), counters are reset at midnight.
XOVIS Accuracy
XOVIS provides highly accurate data on Traffic Line detection, yet some factors might impact people detection:
Make sure lights are turned on/there is enough daylight. It should not be too dark in the room
Nothing should be blocking the sensor detection area
items might be suspended from the ceiling (eg HVAC or light fixtures)
items might be too high and block visibility (eg high back chairs or office screens)
Reflections in windows (might be avoided by restricting count area in the configuration)
Installation needs to be level (not tilted)
Installation location: make sure to verify measurements (height + length/width) in the config platform
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