People counting technologies

Camera vs LiDAR vs thermal people counting

Camera analytics, LiDAR and thermal sensors all count people, but they suit different spaces. Cameras fit doorways and defined zones and can reuse hardware you already own. LiDAR covers large open areas without a camera image. Thermal counts in darkness with the least detail.

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How each technology counts

Technology	How it works	In darkness	What it captures	Hardware
Camera analytics	AI on the camera detects people crossing a line or inside a zone	Needs light or infrared illumination	A camera image; counting can run on the camera and send only counts	A compatible camera, often one already installed
Overhead 3D sensor	A stereo or time-of-flight sensor above the doorway measures depth to separate people	Depends on the model	A depth view from above	A dedicated unit at each entrance
LiDAR	Laser pulses build a 3D view of an area and track the shapes moving through it	Yes	A point cloud, not a picture	A dedicated sensor and processing unit
Thermal	Detects body heat against the background	Yes	A heat pattern with no recognisable features	A dedicated sensor at each doorway or zone
Infrared beam	Counts each time a beam across the doorway is broken	Yes	Nothing but beam breaks	A transmitter and receiver on the door frame

Where each one fits

Space	Usual best fit	Why
Shop, office and facility entrances	Camera analytics or an overhead 3D sensor	A defined doorway is the easiest place to count accurately, and direction matters
Sites already covered by compatible cameras	Camera analytics	No new device to buy, cable or mount
Large open areas such as concourses and plazas	LiDAR	One sensor covers a wide area with no doorway to count at
Spaces where a camera is not acceptable	Thermal or LiDAR	Neither produces a recognisable image
One door and a rough number	Infrared beam	Cheapest option, with the least detail

Counting people without cameras

You can count people without a camera using thermal sensors, LiDAR, infrared beams or estimates from Wi-Fi and Bluetooth signals. Thermal and LiDAR give real counts without a recognisable image. Beams are cheap but cannot separate people walking side by side. Wi-Fi and Bluetooth give an estimate of presence, not a count.

The trade-off is hardware. Each of these needs a dedicated device installed for counting alone. Where a compatible security camera already covers the doorway, counting on that camera adds no new device, and the analytics can run on the camera and send only counts.

People counting and privacy

Accuracy: what matters more than the technology

Mounting position. A sensor or camera that cannot see the full width of the doorway will miss people, whatever technology it uses.
Doorway width and crowding. Wide entrances and groups moving in both directions are the hardest conditions for every counter.
Lighting and environment. Cameras need usable light. Thermal sensors are affected by warm backgrounds.
Validation. Check counts against a manual count at your own entrances before you rely on them, and repeat the check after any change.

Where CountIQ fits

CountIQ uses camera analytics. Counting runs on compatible Axis cameras and the counts are sent to a cloud dashboard for occupancy, footfall trends, alerts and scheduled reports.

It is a good fit where Axis cameras already cover your entrances. It is not the right tool for an area with no Axis camera, or for a space where a camera is not acceptable. For those, look at thermal or LiDAR.

Common questions

Is LiDAR more accurate than camera people counting?

Not as a rule. Accuracy depends more on where the device is mounted and how crowded the space is than on the technology. LiDAR has the advantage in large open areas and in darkness. Cameras and overhead 3D sensors do well at defined doorways.

Can you count people without cameras?

Yes. Thermal sensors, LiDAR and infrared beams all count people without a camera image, and Wi-Fi or Bluetooth signals can estimate presence. Each needs dedicated hardware installed for counting.

What is the cheapest way to count people?

An infrared beam counter is the cheapest device, but it cannot separate people walking side by side and basic units cannot tell direction. If compatible cameras are already installed, counting on those cameras avoids buying counting hardware at all.

Do camera-based people counters record video?

Counting and recording are separate. Counting analytics run on the camera and produce numbers. Whether video is also recorded is a setting of your camera or video management system, not of the counting.

Which people counting technology is best for retail stores?

Most stores count at the entrance, where camera analytics or an overhead 3D sensor work well. If the store already has compatible cameras at its doors, camera analytics is usually the lower-cost route because there is no new hardware to install.