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People Counting System Market: Global Industry Analysis, Forecast -2027 A people counter is an electronic device that counts the number of people passing through a tunnel, entering a building, or passing through an exit. Simple clickers, smart-flooring techniques, infrared beams, thermal imaging systems, WiFi tracking systems, and video counts that use powerful machine learning algorithms are just a few examples of people counter applications. Retailers use them to assess the efficiency of marketing efforts, the design and layout of buildings, and the popularity of certain brands.