“War epidemic” weapon – ZLG intelligent face recognition temperature measurement solution
Abstract: The development of the epidemic has brought the dual challenges of temperature monitoring and management of people entering and leaving public places. Manual registration is difficult to achieve and cannot avoid crowds. Combining face recognition and infrared thermal imaging temperature measurement technology, ZLG has launched a systematic solution of infrared temperature measurement + face recognition + identity verification to help resume work and production.
1. Background overview
Body temperature screening is one of the main means of COVID-19 surveillance and case detection. With the resumption of work in various places, office buildings, parks and other workplaces and schools often have long queues for temperature measurement. How to not only complete the temperature screening, realize the safety management of the park, but also reduce the impact on people’s normal work and life, and avoid the risk of virus transmission caused by queuing for temperature measurement, has become an important requirement in the process of social resumption of work. At the same time, in some special places with identification requirements, such as schools, residential quarters, enterprise parks, etc., the linkage of body temperature detection and access control systems has also become a rigid demand in the current industry. In view of the limitations of the existing temperature measurement system, ZLG has launched a systematic solution of infrared temperature measurement + face recognition + identity verification. The solution is based on the M1808 AI core board, combined with face recognition and infrared thermal imaging technology, in a non-contact and non-perceptual way, to efficiently solve the problem of real-time body temperature detection in the case of high crowds and high mobility in public places. This solution can help maintain the order of public gathering places such as schools, hotels, airport stations, and residential quarters. In addition to preventing illegal intrusions and shortening the time to search for suspicious persons and collect data, it can also perform temperature checks during the resumption boom to ensure the safety of resumption of work. carried out efficiently.
Existing industry needs:
l Body temperature measurement, abnormal body temperature alarm;
l Face access control, brush face to detect body temperature and link access control system to enter and exit;
l Real-name registration, to register the identity of people entering and leaving, which is convenient for management;
l Real-time reporting of body temperature data, data query can be performed in the background;
l Personnel not wearing masks are detected and alarmed in real time;
l The black and white list confirms the alarm and finds out the intruder or the missing person.
2. Principle of face recognition
Face recognition refers to the computer technology that uses the analysis and comparison of visual feature information of faces for identification, including a series of related technologies for building face recognition systems, which are embodied in face image collection, face positioning, face black registration form recognition, Identity confirmation and identity search, etc. From face-scanning payment, access control and attendance, financial remote card opening to security and anti-terrorism, smart community and other fields, face recognition is becoming more and more popular and the market is expanding. In response to market demand, ZLG’s latest M1808 AI core board integrates a high-efficiency AI neural network processor NPU with a computing power of up to 3.0Tops. Combined with the face recognition algorithm developed by Z-Lab’s senior algorithm team, it can effectively help users Face recognition application development to reduce R&D costs.
3. Principle of infrared thermal imaging temperature measurement
All objects with a temperature above zero (-273.15°C) are constantly emitting infrared energy into the surrounding space. Its radiation characteristics, radiant energy size, wavelength distribution, etc. are closely related to the surface temperature of the object. In turn, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately determined, which is the mechanism of infrared radiation temperature measurement. The human body, like other living organisms, is also radiating infrared energy to the surrounding, so the surface temperature of the human body can be accurately determined only by measuring the infrared energy radiated by the human body itself.
4. Intelligent face recognition temperature measurement system
ZLG extracted common requirements in various practical application scenarios, and launched intelligent face temperature measurement solutions for large-scale public places temperature measurement and traditional access control systems, as shown below.
1. Large public places
In large public places, the flow of people is large and dense. Traditional methods of measuring body temperature include mercury thermometers and infrared body temperature guns. The disadvantages are obvious: it takes time, and requires contact and cooperation. In view of the limitations of the existing temperature measurement system, ZLG has launched a large-scale public place infrared thermal imaging temperature measurement solution based on M1808, which can reliably and efficiently solve the problem of high concentration of people in public places, The problem of real-time primary screening and detection of body temperature in the case of high mobility, the block diagram of the scheme is shown below.
Infrared temperature measurement in large public places
2. Traditional access control system
For the traditional credit card access control system, ZLG intelligent face recognition temperature measurement system can realize the linkage of infrared temperature measurement and access control system, adding intelligent temperature measurement face recognition capability to the access control system. There is no need to carry an attendance card when entering and exiting the access control, and face verification synchronously measures temperature, which is convenient and fast, and further improves security and efficiency. The block diagram of the scheme is shown below.
Infrared temperature measurement linkage face access control
The main control platform of the above scheme adopts ZLG’s M1808 AI core board. As an artificial intelligence development platform-oriented product, the M1808 AI core board aims to provide users with an “embedded” + “AI” solution platform, enabling traditional embedded hardware with AI algorithms, and the internal integrated NPU provides up to 3.0 TOPs AI computing power. In the intelligent face recognition temperature measurement system solution, the ZLG M1808 platform not only provides a stable and reliable hardware platform, but also provides a face recognition AI algorithm based on application data set training for free, which can not only meet the requirements of full automation, multi-group, long-distance It can also realize the synchronization of body temperature detection and face recognition technology and identify problems when wearing masks. It can quickly identify people with abnormal body temperature and automatically alarm in real time, ensuring the accuracy of verification results to the greatest extent.
5. Algorithmic logic
The main technical points of the algorithm of this solution are face detection, key point positioning and infrared temperature measurement. The relevant algorithms are independently developed by the ZLG algorithm team, and are optimized in combination with the characteristics of the AI acceleration chip, and the algorithm is highly efficient. The algorithm of this scheme performs face detection on the input image. If a face is detected, the forehead area will be determined by the face key point positioning algorithm, which will be further mapped to the thermal infrared temperature data to determine whether the current temperature exceeds the limit value of 37.3 °C. The application logic is shown in the figure below.
6. Test effect
The ZLG infrared thermal imaging temperature measurement algorithm can realize the synchronization of face recognition and temperature measurement. The specific test results are as follows:
1. Detect the face, and read the area temperature, the temperature Display is normal.
2. Put a hot water bottle on the forehead, detect the face, display the abnormal state of body temperature and give a real-time warning.
7. Core Advantages
For the above application scenarios, this solution can be summarized as the following core advantages:
1. Simple and efficient: Quickly brush your face to measure temperature, and automatically alarm when the body temperature is above 37.3 °C, saving a lot of manpower and material resources and avoiding cross-infection. The M1808 platform integrates NPU and provides 3.0TOPs computing power. Combined with the face recognition algorithm developed by Z-Lab’s senior algorithm team, it can quickly monitor mobile crowds and realize real-time alarms for abnormal body temperature, with high detection efficiency and strong real-time performance;
2. Accurate and reliable: It can effectively solve the synchronization between ZLG face recognition algorithm and temperature detection technology and the recognition problem when wearing a mask. It can accurately locate and quickly lock people with abnormal body temperature and automatically alarm in real time, which is convenient for staff to carry out a second re-examination. And because face recognition technology has unique identification, identity authentication cannot be counterfeited, which can well solve the problems existing in the security management of various enterprises and institutions;
3. Stable and sustainable: On the basis of accurate body temperature measurement and matching records with personnel, attendance record management, check-in and check-out record management, etc. can be completed at the same time, and the data can be recorded objectively and continuously. At the same time, ZLG also provides free The cloud platform (ZWS-PaaS cloud platform) supports transparent data transmission and forwarding and a complete secondary development package, supports full privatization deployment, and provides a feature-rich background MIS system for unified management;
4. Strong compatibility: M1808 platform has abundant peripheral interface resources, and has powerful video hard decoding ability, which can easily and smoothly process various multimedia files, so that the system can integrate common security subsystems in public places, such as video surveillance, Access control, LED screen display, alarm linkage and other systems realize resource sharing among subsystems, provide non-sensing temperature sensing methods for public health emergency handling, and form a linkage control mechanism with associated security systems.