Infrared thermal imaging crowd temperature measurement and screening system
Infrared thermal imaging crowd temperature measurement and screening system
1. Program overview
1. Construction background
A novel coronavirus outbreak broke out in Wuhan at the end of 2019. The virus has the characteristics of human-to-human transmission, medical staff infection, and a certain range of community transmission. The epidemic has spread to all parts of the country.
Figure 1: National epidemic trend map
Starting at 10 o'clock on January 23, Wuhan City and surrounding cities such as Ezhou City, Xiantao City, Qianjiang City, Huanggang City, Jingmen City, etc. have successively announced the suspension of urban bus, subway, ferry, and long-distance passenger transportation, and the temporary closure of airports and railway stations , Highways, etc. leave the passage to strictly prevent the spread of the new coronavirus in Wuhan. However, 13 days have passed since the Spring Festival travel from January 10 to 23, and the craze for returning home is coming to an end. The picture below shows the migration map of Wuhan on the 1st and 22nd, with destinations all over the country!
Figure 2: Wuhan migration map on January 22
On January 20, 2020, the State Council deployed pneumonia epidemic prevention and control work: implement measures such as temperature measurement in key places, and multi-department joint prevention and control.
On January 21, the Ministry of Transport held a ministerial meeting to urge the transportation departments at all levels to cooperate with the health and health departments to set up passenger temperature monitoring facilities at the passenger terminal of the transportation hub under the joint prevention and control work mechanism.
2. Current situation analysis
SARS, Ebola, H1N1, and Wuhan new coronavirus carriers and infected persons have common case characteristics: fever and cough. In clinical medicine, doctors need to measure the patient's body temperature with a thermometer to determine the patient's physiological state. However, in public places, especially in dense populations, if the thermometer in the hospital is still used to measure body temperature to achieve the function of monitoring and alarm, it consumes huge manpower and equipment costs, and the risk of infection is high, and the detection efficiency is low. , It is difficult to achieve the role of prevention and warning.
3. Construction goals
In response to the prevailing human temperature measurement needs in various public places, Beijing Shangbang relies on years of face recognition experience and thermal imaging temperature measurement technology innovations to realize the support of modern information technology to establish network interconnection, covering various public place scenes. A human body temperature measurement information system with information resource sharing, unified standards and specifications, and complete application functions. Combining current biometric technology, thermal imaging temperature measurement technology, video intelligent analysis and other technical means, focusing on the aspects of "high precision, high efficiency, low cost, flexible deployment, safety and reliability", it will achieve "effective prevention, timely control and elimination" The ambitious construction goal of "emergency public health incidents and their harm".
4. Design principles
The planning and design of the thermal imaging body temperature detection program should be oriented by application requirements, using computer application technology as the means, and intelligent prevention and control management as the goal. The planning and construction of the system should follow the following principles:
1) Practicality
In accordance with user requirements and adhere to the principle of practicability, the system must fully meet the actual needs of human body temperature measurement involving various scenarios in public places, adopt the current mainstream computer application technology and combine with the national emergency decision-making and command system for public health emergencies. Under the premise of considering future development needs, avoid blindly pursuing the advancement of system design and the luxury of equipment, make overall planning and seek truth from facts.
2) Security
The construction of the system needs to integrate previous construction experience, combined with the specific application requirements of the national emergency decision-making and command system for public health emergencies, use a software platform architecture with mature application practices to ensure the robustness of the system, and select high reliability and high security. Equipment with tens of thousands of hours of mean time between failures, while designing redundant backups for key equipment and key components. Establish and improve the system's safe and stable operation guarantee mechanism, build system operation failure plans, and guarantee the smooth operation of the system from all angles.
3) Advancement
The system design should follow the design criteria of system engineering. Through scientific and reasonable design, it not only prevents one-sided pursuit of a certain high index, but also fully reflects the advanced nature of the system. Advanced, mature and reliable equipment should be selected, and mature and reliable equipment should be used to a large extent. Inherit advanced security technology with broad development prospects, build an upgradeable, expandable, and compatible system and application platform, and build a digital, networked and intelligent security management system for public security checkpoints.
4) Openness
The system design adopts a standardized design, strictly follows the international and domestic industry standards of related technologies, ensures the transparency and interconnection between the systems, and fully considers the connection with other monitoring systems. In the design and equipment selection, the future expansion demand will be scientifically predicted and the margin design will be carried out.
5) Easy to manage and maintain
The system uses an all-Chinese, graphical software platform to realize the management and maintenance of the entire thermal imaging body temperature detection system. It can automatically detect the operating status of any equipment in the system, and display detailed parameters to assist the management personnel in timely and accurate judgment and resolution of problems. The use of stable and easy-to-use hardware and software does not require any special maintenance tools at all, which not only reduces the cost of professional knowledge training for managers, but also saves daily maintenance costs.
5. Design basis
"National Emergency Plan for Public Health Emergencies"
"Law of the People's Republic of China on the Prevention and Control of Infectious Diseases"
"Infrared rapid screening instrument for human body surface temperature" (GB/T-19146)
"Video Security Monitoring System Engineering Design Specification" (GB50395-2007)
"Video Security Monitoring System Technical Requirements" (GA/T367-2001)
"Video Security Monitoring Digital Video Recording Equipment" (GB20815-2006)
"Technical Specification for Safety Protection Engineering" (GB50348-2004)
"Safety Protection Engineering Procedures and Requirements" (GA/T75-94)
"Safety requirements and test methods for security alarm equipment" (GB16796-1997)
"Civil CCTV System Engineering Technical Specifications" (GB50198-1994)
"Technical Requirements for Intrusion Alarm System" (GA/T368-2001)
"Computer Information System Security Protection Grade Classification Guidelines" (GB17859-1999)
"Computer Information System Security Grade Protection Management Requirements" (GA/T388-2002B)
"IP network technical requirements-network performance parameters and indicators" (YD/T 1171-2001)
"Safety of Information Technology Equipment" (GB4943-2001)
2. Demand analysis
1. The need for rapid temperature screening
In clinical practice, body temperature is an important physiological indicator. Changes in body temperature usually mark the occurrence, development and outcome of diseases. Since fever is a prodromal symptom of many diseases, including certain infectious diseases, fever is very important in the field of public health, especially disease surveillance. Therefore, fever is also an important indicator for symptom monitoring in various countries.
Instruments and meters used to measure human body temperature are roughly divided into two types, namely contact type and non-contact type. Contact-type instruments have the following disadvantages when used for human detection in public places:
1. The temperature measurement speed is slow, and human intervention is required to perform individual temperature measurement one by one;
2. The measurement needs to be in contact with the measured object, and cross-infection often occurs due to incomplete disinfection during use;
With the maturity of detection technology, non-contact instruments are widely used in human body temperature measurement in public places. Among them, the close-range thermal imaging temperature measurement technology has generally matured in various industries and has the following advantages:
1. The measurement speed is fast, usually the detection time is less than 1 second;
2. The detection rate is high, and the temperature of multiple people can be detected at the same time;
3. There is no need to contact the measured object during the measurement, and there will be no cross-infection due to incomplete disinfection;
Therefore, in public places such as stations, subway stations, high-speed rail stations, airports, ferry terminals, schools, etc., non-contact body temperature measurement methods are usually used to quickly measure pedestrians at entrances and exits, and to detect persons with abnormal body temperatures in time, and execute quickly. Intervention methods to prevent the spread of the virus epidemic in public places from a large range of infected people. At the same time, to the greatest extent, protect the managers who carry out epidemic protection in public places, and prevent internal personnel from frequently contacting the human body and becoming infected with the virus.
2. The need for high-precision temperature detection
At present, the new coronavirus is prevalent in the initial stage of the infected person's limb weakness, fever, etc., it is necessary to adopt a high-precision non-contact temperature detection method to distinguish between normal people and people suspected of being infected with low temperature. It is recommended that the measurement accuracy of the body temperature detection device does not exceed ±0.5°C.
Due to the mobility and continuity of personnel in public places, it is also required that the body temperature detection device can perform 7*24 hours of continuous temperature measurement, and strengthen the continuous detection and prevention of personnel in the detection area.
3. The demand for online abnormal warning
Since there are usually more passages in public places such as subways and airports, there are two main problems. On the one hand, the on-site security personnel are limited, and it is impossible to guarantee the on-site personnel temperature detection for all the entrances and exits; on the other hand, there are many entrances and exits, and the personnel mobility is strong, and the on-site intervention and handling of persons with abnormal body temperature may not respond promptly .
It is necessary to network the transportation hubs or other public places with multiple entrances and exits through the networking of thermal imaging temperature measurement cameras, and conduct non-contact body temperature measurement and detection of all passing personnel online. By means of real-time warning of abnormal body temperature, the monitoring personnel of the monitoring center are notified to quickly find suspicious persons for manual intervention. For mobile personnel, through online real-time early warning methods, the trajectory of their actions can be traced through the entire video process, and the response speed of handling interventions can be improved. And can keep important records based on the video recording, so that the relevant personnel information can be traced afterwards.
4. The need for face detection and temperature measurement
The front-end camera that supports face detection can improve the accuracy of body temperature measurement when the target is a human body. In order to avoid invalid measurement of other non-human target objects, causing false alarms of early warning information.
Face detection can also be used for the purpose of fortifying key personnel, effectively fortifying and early warning personnel suspected of being infected and effectively controlled. Improve the efficiency of direct intervention and response to target fortified personnel at the entrance and exit of important public places.
3. Overall system design
With many years of experience in artificial intelligence technology and thermal imaging temperature measurement technology innovation, Beijing Shangbang Technology Co., Ltd. has achieved the support of modern information technology to build a human body temperature measurement that covers various public scenes with network interconnection, rapid detection and complete application functions. Early warning management and control information system. Combining current biometric technology, thermal imaging temperature measurement technology, video intelligent analysis and other technical means, focusing on the aspects of "high precision, high efficiency, low cost, flexible deployment, safety and reliability", it will achieve "effective prevention, timely control and elimination" The construction goal of "emergency public health incident and its harm".
1. Technical Principle
Infrared radiation:
In nature, any object with an absolute temperature greater than zero degrees (-273°C) can radiate electromagnetic wave energy related to its nature and temperature. This phenomenon is thermal radiation or infrared radiation.
Infrared radiation is one of the most widespread electromagnetic radiation in nature. It is based on the fact that any object will produce its own irregular movement of molecules and atoms in a normal environment, and constantly radiate thermal infrared energy, the movement of molecules and atoms The more intense, the greater the radiated energy, and vice versa, the smaller the radiated energy.
Thermal imaging camera composition:
Based on the principle of infrared radiation, Beijing Shangbang developed a thermal imaging camera. Thermal imaging camera includes optical lens, infrared detector, signal processing system and protective cover, as shown in the figure.
Figure 3: Principle and composition of thermal imaging camera temperature measurement
Thermal imaging camera temperature measurement principle:
The infrared radiation emitted by the measured object is collected by an optical lens and then captured by an infrared detector. The infrared radiation energy of the measured object is detected by the infrared detector. There is a corresponding relationship between radiant energy and temperature. The radiant energy, that is, temperature, is displayed in different gray scales through the signal processing system, and different gray scales represent different temperatures. Then use the black body (the reference source used to calibrate the infrared system) for temperature measurement calibration to establish an accurate corresponding relationship between grayscale and temperature to achieve the temperature measurement function.
Figure 4: Thermal imaging effect diagram
2. System composition
The temperature measurement screening system is composed of a front-end human body temperature measurement sound and light alarm system and a site computer. The front-end human body temperature measurement system can be composed of a cloth-controlled thermal imaging human body temperature measurement camera and a high-precision human body temperature measurement black body at the pedestrian passage entrance, and a temperature measurement gate can be used at the pedestrian entrance. The site computer deploys local temperature measurement management software to manage temperature measurement cameras and temperature measurement barriers, and to measure temperature alarms.
3. System advantages
The two modes of the system can be flexibly deployed according to different scenarios. It can be used as an emergency sensorless body temperature measurement and screening of mobile personnel at the entrance and exit of the passage in emergencies, and can also be used to normalize the entrances of various passages in transportation hubs, schools, and parks. Non-sensitivity temperature measurement and screening of migrants are carried out. The system can integrate common security subsystems in public places, such as video surveillance, LED screen display, access control, alarm linkage and other systems, to realize resource sharing among the subsystems, provide non-sensing temperature measurement methods for public health emergency handling, and associate with security systems Form a linkage control mechanism between.
4. Distributed human body temperature measurement and screening system
1. Application scenarios
For temperature measurement stations with professionals on duty, such as passenger stations, railway stations, subway stations, airports and other security check entrances, the orderly passage of passengers is only required to deploy a human body temperature measurement binocular camera (self-contained sound) at each entrance Light alarm) and high-precision human body temperature measurement blackbody, connected to the on-site computer (installed Beijing Shangbang temperature measurement management system software) for configuration management, you can realize the temperature detection of the over-examined personnel, if the body temperature is abnormal, the alarm will remind the duty personnel to proceed further Disposal.
2. Business Process
Figure 5: Business process of distributed temperature measurement and screening
3. System composition
The system consists of a front-end human body temperature measurement system and a site computer.
The front-end human body temperature measurement system includes a human body temperature measurement camera and a high-precision human body temperature measurement black body;
Site deployment and installation of Beijing Shangbang temperature measurement management software.
4. System function
Thermal imaging human body temperature measurement
Through the thermal imaging camera (non-contact method), preliminary human body temperature detection of persons entering the temperature measurement range.
Sound and light alarm for abnormal body temperature
If an individual with abnormal temperature is found, the thermal imaging camera (with its own acousto-optic alarm module) triggers an acousto-optic alarm to remind the on-site staff to take further action.
Face Detection
Automatic face detection effectively eliminates interference from non-temperature measurement targets; abnormal body temperature alarms carry face pictures for accurate tracking and disposal.
Intelligent Video Storage Server (IVSS)
① Temperature measurement alarm: front-end human body temperature measurement screening alarm access, display, processing, storage and playback
② Video compression: to the original
The original video is losslessly compressed, and a forwarding stream is provided for the platform
③Face recognition: It carries the intelligent face recognition technology based on deep learning, which can realize accurate face analysis and application
④ Perimeter alarm: filter invalid intrusion targets through deep learning algorithm to realize human/vehicle identification and alarm
⑤Data structuring: extract the key information of "person", "machine" and "non" in the video, and extract the attributes of the key information to realize the precise deployment and control of key objects, query and later big data application
In the scenario of a small security room, IVSS is an NVR+, a device that integrates "storage", "decoding" and "intelligence".
Temperature measurement management software
① Video surveillance
Support multiple devices at the same time real-time preview (window split); support manual recording, snapshot; support local pictures, video playback; support video wall, window round robin.
② Alarm management
Support human body temperature measurement abnormal alarm access, pop-up reminder; alarm event processing (resolved, unresolved, processing, false alarm, ignored); support alarm linkage video; support viewing alarm event related pictures and videos.
③ Equipment management
Support automatic search, manual, and import equipment; support remote configuration of equipment; support equipment exception handling (network disconnection, IP conflict, illegal access, etc.)
5. Deployment Design
1) Site survey requirements
Thermal imaging temperature camera installation height: 2 meters; black body installation height: 1.8 meters. Product pictures and tripod installation instructions are as follows:
Figure 8: Schematic diagram of installation of thermal imaging camera tripod
The thermal imaging camera and the black body are installed on the same side, the pedestrian passage is on the other side, and the distance between the camera and the black body is 3 meters to avoid obstruction between the camera and the black body during temperature measurement.
Figure 9: Blackbody installation diagram
The black body radiation surface needs to be in the direction facing the camera, and the black body needs to be on the left or right side of the thermal imaging screen
The following boldface is on the right side of the image:
Figure 10: Schematic diagram of black body installation
The viewing angle of the camera is less than 30 degrees, and it is not suitable to look up or down.
It is required that the visible light channel has sufficient illuminance, and avoid the effects of backlight/return light/strong light change/blocking/high temperature interference.
The installation area needs to be relatively isolated and stable from the outside world, avoid outdoor or open scenes, and it is not suitable for environments with airflow or strong electromagnetic interference or vibration.
Avoid installation scenario diagram (insufficient light: backlight/scenario connected to the outdoors)
2) Recommended distance
Lens focal length Recommended use distance
3.5mm 2m~3m
7mm 3m~4m
6. Program features
1) Convenient deployment: human body temperature measurement thermal imaging camera + black body + ordinary PC constitutes a small temperature measurement station
2) Safety: non-contact thermal imaging temperature measurement to avoid the risk of cross infection
3) High efficiency: the detection time is less than 1 second, and it can detect multiple people at the same time
4) High detection rate: face detection and temperature measurement to avoid interference from other non-human targets
5) All-weather: 7x24 hours online real-time temperature measurement, preliminary screening, early warning intervention
5. Temperature measurement and screening system for customs clearance gates
1. Application scenarios
For scenarios where barriers can be installed in airports, customs, stations, buildings, etc., deploy integrated human body temperature measurement gate equipment, and connect to the on-site computer (install Beijing Shangbang temperature measurement management system software) for configuration management, and you can realize the check Check the identity of the inspector and measure the body temperature. If the identity is verified and the body temperature is normal, the door will be cleared. If the identity or body temperature is abnormal, the door opening prohibition mode will be activated and the guard will be alerted for further treatment. After the treatment is completed, the privilege card will be swiped to return to the normal door opening mode.
2. Business Process
Figure 12: The business process of the temperature measurement and screening system of customs clearance gates
3. System composition
Figure 13: Topological diagram of the temperature measurement and screening system of the customs clearance gate
4. System function
1) Human body temperature access control
Human body temperature integrated gate design, anti-collision, anti-following, legal identity verification and normal body temperature before opening the door.
2) Sound and light alarm for abnormal body temperature
If an individual with abnormal temperature is found, the integrated turnstile will trigger an audible and visual alarm and turn on the prohibition of opening the door mode to remind the on-site staff to take further action.
3) Face detection
Automatic face detection effectively eliminates interference from non-temperature measurement targets; abnormal body temperature alarms carry face pictures for accurate tracking and disposal.
4) Supporting software function (temperature measurement management system)
① Video surveillance
Support multiple devices at the same time real-time preview (window split); support manual recording, screenshots; support local pictures, video playback; support video wall, window patrol.
② Alarm management
Support human body temperature measurement abnormal alarm access, pop-up reminder; alarm event processing (resolved, unresolved, processing, false alarm, ignored); support alarm linkage video; support viewing alarm event related pictures and videos.
③ Access control management
Supports one-key normally open and one-key normally closed for all access control channels to return to normal; supports monitoring and control of the door open and close status of access control channels.
④ Equipment management
Support automatic search, manual, and import equipment; support remote configuration of equipment; support equipment exception handling (network disconnection, IP conflict, illegal access, etc.)
5. Deployment design (points of equipment installation)
Please refer to the manual of sidewalk gate
6. Program features
1) High integration: Thermal imaging human body temperature measurement camera + pedestrian leading integrated design, convenient for installation and deployment;
2) Safety: non-contact thermal imaging temperature measurement to avoid the risk of cross infection
3) High efficiency: the detection time is less than 1 second, and it can detect multiple people at the same time
4) High detection rate: face detection and temperature measurement to avoid interference from other non-human targets
5) All-weather: 30x24 hours online real-time temperature measurement, preliminary screening, early warning intervention
6) Reliable: anti-collision and anti-tailing
6. Introduction of core products
1. Human body temperature measurement binocular camera
Vanadium oxide uncooled infrared focal plane detector
Detector resolution: 256*192
Spectral range: 8μm~14μm
Thermal imaging lens: 3.5mm/7mm optional
Sensitivity: <50 mK
Visible light: 1/2.8" CMOS
Visible light lens: 4mm/8mm optional
Sound and light warning: built-in white light warning light, horn
Temperature measurement range: 30℃～45℃,
Resolution: 1080P
Temperature measurement accuracy: ±0.3℃, with black; ±1℃, without black body
2. Human body temperature measurement binocular ball machine
Thermal imaging adopts industry-leading uncooled vanadium oxide focal plane detector, with high sensitivity and good image quality
AI intelligence: face detection, face temperature measurement, and can link multiple alarm actions, such as email, external alarm, etc.
Support high-precision non-contact temperature measurement, ±0.3℃, with black body; ±1℃, without black body
Security: Support IP whitelist and blacklist, MAC whitelist and blacklist, multi-level user management, humanized monitoring confidentiality and authority management
H.265 encoding: low bit stream transmission, saving bandwidth
Support GBT28181, ONVIF and other network protocols, making networking more convenient
Support WEB, mobile phone and PC and other clients to preview and view video images
SD card local storage, support for continuous transmission
Support white heat, black heat, fusion, rainbow, golden autumn, midday, iron red, amber, spring, summer, autumn and winter, etc. 18 kinds of pseudo color adjustable
Support voice intercom
Support sound and light warning
3. Body temperature measurement black body
Working temperature: 40.0℃ (Ambient temperature +5.0℃~ 50.0℃ adjustable)
Temperature resolution: 0.1℃
Temperature measurement accuracy: ±0.2℃ (single point)
Temperature stability: ±( 0.1～0.2 )℃/30min
Effective emissivity: 0.97±0.02
Power supply: 220VAC 50Hz
Environmental temperature and humidity: 0~40℃/ ≤80%RH
4. Human body temperature measuring gate
Human body temperature measurement module: temperature measurement range: 30℃～45℃, temperature measurement accuracy: ±0.3℃, with black body; ±1℃, without black body; functions: face detection, face temperature measurement, sound and light warning
Barrier gate module: chassis material: 304 stainless steel, wall thickness 2.0mm
Motor type: Servo motor
Infrared detection number: 30 pairs
Channel width: 600mm~1000mm optional
Swing arm material: Acrylic
Function: face recognition, IC card, QR code, fingerprint, etc. optional
Power supply: AC 100-240V/50~60HZ
5. Intelligent video surveillance integrated machine
Support 300,000 face pictures, 50 face list library
Support 6-channel face recognition (1080p video stream) or 20 pictures/second picture stream comparison alarm
Support 10 million face history snapshot library
Support 10 million people body detection history snapshot library
Support linkage video, snapshot, log, buzzer, email, preset point, local alarm output, IPC alarm output, access control, voice broadcast
Network bandwidth: network bandwidth 400Mbps access, 320Mbps storage, 96Mbps forwarding;
Access capacity: 128 channels
Decoding ability: 20 1080P
Video output: 2 VGA outputs, 3 HDMI outputs, of which VGA1 and HDMI1 output from the same source, VGA2 and HDMI2 output from different sources
Support 4K display hard disk interface: 8, SATA3.0, single disk maximum 10T