Analysis on the scheme of face recognition thermometer


Recently, the most popular visual AI products are non-face recognition temperature and temperature all-in-ones. During special periods, entering and leaving public places such as schools, enterprises, communities, and stations, temperature measurement has become a "project" that everyone needs to experience. Therefore, the all-in-one face recognition temperature and temperature measurement machine that can achieve efficient temperature measurement under non-contact conditions has received strong attention from the global market, and overseas orders have also surged synchronously.

   In view of this situation, this article will help developers in need to further understand the products and R&D solutions of the face temperature measuring machine from three aspects: technical principles, free algorithm recommendation, and face recognition hardware selection.

Product principle: precise face lock, infrared remote temperature measurement

   Traditional hand-held temperature measurement equipment has low detection efficiency and requires direct contact between the target and the device, which has the risk of cross-infection. In contrast, a temperature measurement integrated machine based on face recognition and infrared thermal imaging technology has the following advantages:

   1. Low cost of use: no need for human operation, it is a high-cost automatic temperature measurement product, which is lower in cost, better in price, and easier to install than similar products such as infrared security doors commonly found in the industry;

   2. Abundant functions: it can replace ordinary time attendance machine and access control machine. Besides infrared non-contact temperature measurement function, it also has functions such as time attendance management and authority passage;

   3. Convenient integration: It can be directly installed on the existing access control and barriers, which is convenient to use and does not need to replace large equipment.

Specifically, the temperature measurement function of the temperature measuring machine is based on "infrared thermal imaging technology" to measure the target temperature: objects above absolute zero (minus 273 degrees Celsius) will emit "thermal infrared", which is captured by a specific detector. Can be converted into infrared thermal imaging visible to the naked eye.

  Compared with other temperature measurement methods, the advantages of thermal infrared temperature measurement are intuitive enough, no contact is required, the detection distance is relatively far, and people with abnormal body temperature can be quickly screened in crowded places.

  However, the infrared temperature measurement technology used alone also has shortcomings: On the thermal infrared imaging map, objects of the same temperature are classified as a class. In other words, if 37.3°C is used as a warning line, if the target body temperature is normal, but the warm water above 37.3°C is held, it will still be alerted by the traditional infrared temperature measuring machine.

   For this situation, it is necessary to introduce face recognition technology to accurately "segment" the temperature measurement target from the surrounding environment. Based on face recognition technology, it can not only accurately lock the face, but also achieve multiple functions such as access control, attendance, and visitor management.