Time-of-Flight people counters: how accuracy is measured
Ensuring counting accuracy is of utmost importance to derive meaningful insights and make informed decisions based on the collected data.
In this article, we will explore how counting accuracy is measured with Time-of-Flight people counters, drawing from reputable sources to provide reliable information.
Principles of Time-of-Flight people counters
Time-of-Flight people counters work on the principle of emitting short bursts of infrared light and measuring the time it takes for the light to return after hitting an object (a person in this case).
By calculating the time taken and applying formulas, the distance between the sensor and the object can be determined accurately. Typically, these sensors are installed at entrances, exits, or designated areas to capture people’s movements as they enter or leave a location.
Optimizing counting accuracy
Terabee People Counting sensors rely on specific factors for optimal performance. Proper positioning of the sensor to ensure an unobstructed view of the monitored area is crucial. By ensuring minimal blind spots and maximal coverage, you can optimize the placement. To achieve this, consult the device user manual for guidance on proper device orientation and placement.
Impact of sunlight
Consider the impact of sunlight exposure on the Terabee People Counting sensors. The Time-of-Flight technology they employ uses infrared light, which partially overlaps with sunlight radiation. This overlap can affect the device’s functionality. To prevent any issues, Terabee recommends installing the device indoors to prevent the sun’s reflection from falling on people’s heads and shoulders. If indoor installation isn’t feasible, you can consider the following steps:
- Adjust the installation height to reduce the direct sunlight’s effect on the device’s field of view.
- Place non-reflective flooring in areas where sunlight reaches the ground.
Take care when dealing with obstacles and external infrared sources, for example, avoid positioning people counting devices above ‘Exit’ signs or obstructions that could hinder the field of view or introduce interference.
In rare instances, other infrared sources like automatic door sensors or security cameras might impact the device’s functionality. If unusual counts or distorted infrared images occur (black pixels), relocate the device and verify if the issue persists.
Measuring counting accuracy
To assess the counting accuracy of Time-of-Flight people counters, manufacturers and researchers conduct validation studies. During these studies, controlled experiments are designed with known numbers of people passing through the sensor’s field of view. The actual count is then compared with the system’s recorded count to determine the accuracy level. To evaluate counting accuracy of Terabee Time-of-Flight people counters, various methodologies are employed:
This is one of the most reliable methods and it involves creating a controlled environment. Terabee experts manually count individuals passing through the sensor’s field of view and compare it with the system’s output.
Real-life use case accuracy testing
In order to validate counting accuracy in real-world scenarios, Terabee ToF people counters are deployed in multiple live environments which cover most use cases. The system’s performance is compared against manual counts or data from other counting methods.
Time-of-Flight people counters from Terabee
Terabee people counters are designed to be accurate, reliable, and easy to install. The sensors use advanced algorithms to filter out false readings and noise. They provide accurate counting in a variety of settings. All data is fully anonymous, privacy-respecting and GDPR-compliant.
Terabee’s people counting devices are designed to be highly adaptable and can be used in a variety of settings, including space and flow monitoring in commercial real estate settings, operations optimization in company canteens and staff dining rooms, and smart university campuses.
With its ability to aggregate data taken from up to five separate sensors, the Terabee People Counting L-XL device offers easy installation and configuration. It is a highly accurate solution to gather data on people flow at large doors, entrances and indoor gates, such as auditoriums and large theatres. Its smaller sibling, the Terabee People Counting M LoRa device is suitable for standard doors and narrow corridors, such as in meeting rooms and washrooms.