CN111664946A - Wide-area temperature screening equipment - Google Patents
Wide-area temperature screening equipment Download PDFInfo
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- CN111664946A CN111664946A CN202010564545.0A CN202010564545A CN111664946A CN 111664946 A CN111664946 A CN 111664946A CN 202010564545 A CN202010564545 A CN 202010564545A CN 111664946 A CN111664946 A CN 111664946A
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- 238000012216 screening Methods 0.000 title claims abstract description 16
- 238000009529 body temperature measurement Methods 0.000 claims description 34
- 238000001931 thermography Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 18
- 230000036760 body temperature Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 210000003128 head Anatomy 0.000 description 4
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- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 206010011409 Cross infection Diseases 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
- G01J5/0025—Living bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Abstract
The invention discloses wide-area temperature screening equipment, which is characterized in that an image of a preset part of a to-be-detected body is captured by a visible light camera, a thermal imager is used for detecting the temperature information of the to-be-detected body, and whether the temperature of the to-be-detected body exceeds the standard or not is judged according to the distance between the to-be-detected body and the thermal imager through a display control device, so that the temperature of the to-be-detected body is accurately measured.
Description
Technical Field
The invention relates to the technical field of infrared detection, in particular to wide-area temperature screening equipment.
Background
The working principle of the infrared thermometer is to determine the temperature of a body to be measured by detecting an infrared image, but because the infrared temperature measurement is influenced by various environmental conditions, the traditional infrared thermometer only focuses on infrared detection for temperature measurement, and completely ignores the influence of factors such as environment and the like on the temperature, the existing infrared thermometer has false alarm and false alarm, thereby influencing the popularization and the use of the infrared thermometer.
Disclosure of Invention
The invention provides wide-area temperature screening equipment, which aims to solve the problem that the temperature of an infrared thermometer in the prior art is inaccurate.
The present invention provides a wide area temperature screening apparatus, the apparatus comprising: the device comprises a device main body and a display control device; the apparatus main body further includes: a visible light camera and a thermal imager for measuring temperature; the visible light camera is used for capturing an image of a preset part of the object to be detected and sending the captured image to the display control equipment; the thermal temperature measurement imager is used for detecting the temperature information of the object to be detected and sending the temperature information to the display and control equipment; and the display control equipment is used for judging whether to give an alarm or not according to the distance information between the object to be detected and the thermal imager, the temperature information and a preset temperature threshold value, superposing the image of the preset part of the object to be detected, captured by the visible light camera, with the temperature data of the object to be detected, detected by the thermal imager, and displaying in real time.
Optionally, the apparatus further comprises: a temperature indicator;
the display control equipment is also used for triggering the temperature indicator to start when the temperature data of the body to be detected is judged to exceed the preset temperature threshold, and highlighting the image and the temperature data of the preset part of the body to be detected, of which the temperature data exceeds the preset temperature threshold, through control;
the temperature indicator is used for emitting laser to the body to be measured with the temperature data exceeding the preset temperature threshold value and tracking the body to be measured in real time according to control so that related personnel can position the body to be measured.
Optionally, the apparatus further comprises: the baffle is arranged at the infrared lens of the thermal temperature measurement imager, a temperature sensor is arranged in the baffle, and the thermal temperature measurement imager is corrected based on the ambient temperature information measured by the temperature sensor.
Optionally, the display and control device is further configured to count and analyze the received temperature information of the object to be measured, and determine preset temperature thresholds at different distances from the thermal imager.
Optionally, the display and control device is further configured to select a preset number of pieces of temperature information according to a preset selection rule from the latest received temperature information of the object to be measured based on different distances from the thermal imager, determine a preset temperature threshold value at a corresponding distance according to an average value of the preset number of pieces of temperature information, and compare the temperature information at different distances with the preset temperature threshold value corresponding to the distance to determine whether to alarm.
Optionally, the preset selection rule is a principle that a temperature information value is the highest.
Optionally, the display and control device is further configured to determine a distance between the object to be measured and the visible light camera according to the pixels of the image, determine actual temperature information of the object to be measured based on a preset distance temperature classification table, compare the actual temperature information with the preset temperature threshold, determine whether the actual temperature information is greater than the preset temperature threshold, and alarm if the actual temperature information is greater than the preset temperature threshold.
Optionally, the apparatus further comprises: a tripod; the tripod is used for supporting the equipment main body.
Optionally, the detector in the thermography is a detector with more than 384 × 288 elements, and the temperature measurement angle is 30 ° × 24 °.
Optionally, the body to be measured is a human body, and the head of the preset part is arranged.
The invention has the following beneficial effects:
the image of the preset part of the body to be measured is captured through the visible light camera, the thermal imager for temperature measurement detects the temperature information of the body to be measured, and the display control equipment judges whether the temperature of the body to be measured exceeds the standard or not according to the distance between the body to be measured and the thermal imager for temperature measurement, so that the temperature of the body to be measured is accurately measured.
Drawings
FIG. 1 is a schematic block diagram of a wide-area temperature screening apparatus provided by an embodiment of the present invention;
fig. 2 is a schematic workflow diagram of a display and control device according to an embodiment of the present invention;
FIG. 3 is a schematic view of a monitoring process of a wide-area temperature screening apparatus according to an embodiment of the present invention.
Detailed Description
Aiming at the problem that the existing infrared thermometer is inaccurate in temperature measurement, the embodiment of the invention captures the image of the preset part of the object to be measured through the visible light camera, the thermal imager detects the temperature information of the object to be measured, and the display control equipment judges whether the temperature of the object to be measured exceeds the standard according to the distance between the object to be measured and the thermal imager, so that the object to be measured is accurately measured in temperature. The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
An embodiment of the present invention provides a wide-area temperature screening device, see fig. 1, including: the device comprises a device main body and a display control device; the apparatus main body further includes: a visible light camera and a thermal imager for measuring temperature;
the visible light camera is used for capturing an image of a preset part of the object to be detected and sending the captured image to the display control equipment;
the thermal temperature measurement imager is used for detecting the temperature information of the object to be detected and sending the temperature information to the display and control equipment;
and the display control equipment is used for judging whether to give an alarm or not according to the distance information between the object to be detected and the thermal imager, the temperature information and a preset temperature threshold value, superposing the image of the preset part of the object to be detected, captured by the visible light camera, with the temperature data of the object to be detected, detected by the thermal imager, and displaying in real time.
In specific implementation, the body to be detected is a human body, the head of the preset part is erected on a tripod, and the head of the human body is monitored by erecting the equipment main body on the tripod.
In the concrete implementation, the temperature of various heating elements can be measured by providing the device of the present invention. The present invention is not particularly limited in this regard.
The detector of the thermal temperature measurement thermal imager in the embodiment of the invention comprises the following components: 640 multiplied by 512, pixel spacing of 17 μm, temperature measurement angle: 30 ° × 24 °, high temperature alarm rate: better than 99%, temperature measurement distance: 2-20 m; focal length: 19mm, pixel pitch: 17nm, working band: 8-14 μm, temperature sensitivity: better than 0.3 ℃, temperature measuring range: -20 ℃ to +150 ℃; number of simultaneously detected targets: > 30, number of detections per minute: is more than 300.
The visible light camera in the embodiment of the invention has an effective pixel of 200 ten thousand, a focal length of 6mm, a light transmission aperture of more than 40mm, a minimum illumination of 0.002Lux @ (F1.2, AGCON),0Lux with IR, a resolution of 50Hz:25fps (1920 x 1080; 1280 x 960; 1280 x 720)
It should be noted that the above are only basic parameters of the thermal imager and the visible light camera in the embodiment of the present invention, and those skilled in the art may also use other parameters in the specific implementation, which is not limited in the present invention.
In order to obtain higher test accuracy, the thermal imager for temperature measurement of the embodiment of the invention adopts detection pixels larger than 384 x 288 and the temperature measurement angle is 30 degrees x 24 degrees, so that the reliability of temperature measurement of the thermal imager for temperature measurement is further improved, and the range of the collected temperature is expanded.
In other words, the image of the preset part of the body to be measured is captured by the visible light camera, the thermal imager for temperature measurement detects the temperature information of the body to be measured, and the display control equipment judges whether the temperature of the body to be measured exceeds the standard or not according to the distance between the body to be measured and the thermal imager for temperature measurement, so that the temperature of the body to be measured is accurately measured.
Overall, the device provided by the embodiment of the invention is a non-contact, convenient and safe rapid body temperature screening device. This product utilizes infrared temperature measurement technique and face identification technique based on visible light, can carry out quick body temperature monitoring and preliminary screening to a plurality of personnel in the formation of image visual field, can effectively reduce the cross infection risk because of closely the temperature measurement brings, and the personnel that generate heat of higher than normal human temperature range is checked out fast, applicable in all kinds of big occasions of people flow such as airport, railway station, subway station, hospital, office, mill.
In specific implementation, in this embodiment of the present invention, the apparatus further includes: a temperature indicator;
the display control equipment is also used for triggering the temperature indicator to start when the temperature data of the body to be detected is judged to exceed the preset temperature threshold, and highlighting the image and the temperature data of the preset part of the body to be detected, of which the temperature data exceeds the preset temperature threshold, through control;
the temperature indicator is used for emitting laser to the body to be measured with the temperature data exceeding the preset temperature threshold value and tracking the body to be measured in real time according to control so that related personnel can position the body to be measured.
The display control client, namely the display control device, not only plays a role of displaying real-time videos, but also combines an AI face recognition technology with an infrared thermal imaging technology, so that a large amount of data analysis and processing are required, and the display control device at the rear end needs to have high configuration performance.
The detection process of the embodiment of the invention is shown in fig. 2, and the human face detected by deep learning of each frame of visible light can be mapped on an infrared image by correcting the optical axes of the infrared light and the visible light, the synchronism of video frames and the synchronism of two eyes, and the temperature data superposed by the infrared video can be superposed on the visible light in real time, so that the real-time human face temperature can be seen on the visible light video, and the real-time human face temperature can be seen on the infrared video, and the synchronism of the temperature detection human face is realized.
When the temperature of the face is larger than the set alarm temperature threshold value, the current face is alarmed, and therefore the temperature measurement efficiency and accuracy are effectively improved. Simultaneously, different targets are subjected to face snapshot, and the snapshot pictures can be superimposed with alarm temperature information in real time, so that a user can visually count temperature information. The software also superimposes the motion tracks on the human face, and stores and classifies the motion tracks so as to be convenient for the user to search in detail.
In specific implementation, in this embodiment of the present invention, the apparatus further includes: the baffle is arranged at the infrared lens of the thermal temperature measurement imager, a temperature sensor is arranged in the baffle, and the thermal temperature measurement imager is corrected based on the ambient temperature information measured by the temperature sensor.
Namely, in the aspect of hardware design, the double-light temperature measuring equipment is additionally provided with a baffle for temperature correction in front of the infrared lens, and a temperature sensor is arranged in the baffle, so that the thermal imager can be corrected according to the change of the external environment, and the temperature measurement accuracy is ensured. Compared with other temperature measuring equipment needing to install the black body, the temperature measuring equipment has the advantages of convenience in deployment and low energy consumption.
Further, in the embodiment of the present invention, the display and control device is further configured to count and analyze the received temperature information of the object to be measured, and determine preset temperature thresholds corresponding to different distances from the thermal imager.
Namely, the display and control device is further configured to select a preset number of pieces of temperature information according to a preset selection rule from the latest received temperature information of the object to be measured based on different distances from the thermal imager, determine a preset temperature threshold value at a corresponding distance according to an average value of the preset number of pieces of temperature information, and compare the temperature information at different distances with the preset temperature threshold value corresponding to the distance to determine whether to alarm. The preset selection rule is a principle that the temperature information value is the highest.
In addition, when the method is specifically implemented, the display and control device is further configured to determine a distance between the object to be measured and the visible light camera according to the pixels of the image, determine actual temperature information of the object to be measured based on a preset distance temperature classification table, compare the actual temperature information with the preset temperature threshold, determine whether the actual temperature information is greater than the preset temperature threshold, and alarm if the actual temperature information is greater than the preset temperature threshold.
The device provided by the embodiment of the invention can realize linkage of visible light and infrared light, can help a user to quickly and safely screen abnormal body temperature personnel, and greatly improves the detection efficiency. The thermal imager adopts a 640 x 512-sized detector, and the higher pixels bring better imaging effect and larger action range: a horizontal effective detection area of over 30 degrees and an effective detection distance of over ten meters.
The filtering interference heat source of the embodiment of the invention comprises: the detection flow combines an AI face recognition technology with an infrared thermal imaging technology. The software adopts a deep learning algorithm, only the human face in each frame of image of visible light is detected, then the human face is mapped on the infrared image, the temperature data superposed by the infrared video is superposed on the visible light in real time, and the real-time human face temperature can be displayed on both the visible light and the infrared video. Therefore, the synchronism of detection can be ensured, other high-temperature heat sources can be excluded, and the accuracy of detection is improved.
The suspected heating target indication of the embodiment of the invention comprises the following steps: when the temperature of the face is larger than the set alarm temperature threshold value, the current face is alarmed. The double-light temperature measuring equipment is innovatively provided with the laser indicator: when the equipment finds the high-temperature target, the software gives an alarm and sends a laser signal to track the related target, and a worker can quickly catch the high-temperature target according to the laser signal without paying attention to a computer screen all the time to carry out secondary body temperature detection. Meanwhile, the output power of the laser is adjustable, so that the laser can accurately track without damaging human eyes. And the software can be used for snapshotting and video storage of high-temperature personnel, so that the evidence can be conveniently checked and obtained in detail after the accident. Compared with other temperature measuring equipment, the equipment provided by the embodiment of the invention solves the problem that workers are not easy to locate the alarm triggering personnel in a scene with large pedestrian volume.
The temperature measurement correction of the embodiment of the invention comprises the following steps: the double-light temperature measuring equipment is additionally provided with the baffle for temperature correction in front of the infrared lens, and the temperature sensor is arranged in the baffle, so that the thermal imager can be corrected according to the change of the external environment, and the temperature measurement accuracy is ensured. Compared with other temperature measuring equipment needing to install the black body, the temperature measuring equipment has the advantages of convenience in deployment and low energy consumption.
The remote wide-area human body temperature screening method comprises the following steps: the thermal infrared imager of the device adopts a high-performance detector, the focal length of the detector is 19mm, the horizontal field angle is 30 degrees, and the calculation process of the transverse observation range in the distance of 8 meters comprises the following steps: the observation range d at 8 meters is 2 × 8 × tan15 ° -4.3, and the temperature of more than 10 persons can be measured theoretically at the same time, with a specification of 8 meters and 5 persons at most, a measurement range of 3.8m at 7 meters, 4 persons at most, a measurement range of 3.2m at 6 meters, and 4 persons at most, at least one meter apart.
The false alarm rate of the new generation of double-light temperature measuring equipment to high-temperature personnel is basically zero, and the traditional single-infrared temperature measuring equipment can give an alarm to objects such as a heater, hot drinks and the like without difference. We performed one experiment as follows: the equipment is aligned to a blackbody adjusted to be 38.5 ℃, the alarm threshold value of software is manually input to be 37.5 ℃, then 1000 people pass through the field of view, the alarm frequency of the equipment to the blackbody is 0, and the detection rate of the equipment to the human face reaches 100 percent, so that the combination of the human face detection technology and infrared temperature measurement can effectively eliminate other high-temperature heat sources.
The double-light temperature measuring equipment can identify and detect the face in the view field after being started and detected, judge whether the face temperature exceeds a temperature threshold value or not, and send out an alarm if the face temperature exceeds the temperature threshold value, and snapshot suspected high-temperature face pictures and keep visible light videos. The staff can confirm the target to further verify according to the saved visible light image.
The double-light temperature measuring equipment can also emit laser to indicate a high-temperature target and send out warning to workers. We performed one experiment as follows: arranging a person as a target at a distance of ten meters from the dual-light thermodetector, opening a cross fork of an infrared picture in software, adjusting the direction and the pitching of equipment to enable the cross fork in the picture to be aligned with the head of the person, opening laser in the software, and finding that the laser hits the face or the neck of the person at the moment. The laser indicator can help workers to locate high-temperature workers in a scene with large pedestrian volume.
Compared with other similar products which need stopping and close-range one-by-one temperature measurement screening in the market, the wide-area group temperature screening is adopted, the delay of a large number of people caused by body temperature detection is avoided, and the number of people which can be screened in unit time is greatly increased.
The cable of the equipment is simple to connect, the main cable is provided with a network interface and a power supply, the network interface and the rear-end computer are connected by the network cable, the 12V power adapter is butted with the power supply interface, the other end of the power adapter is connected with 220V commercial power, and the equipment can normally work.
The following describes in detail a monitoring process of the wide-area temperature screening device according to an embodiment of the present invention with reference to fig. 3, with a human face as a detection object:
simultaneously collecting a visible light image, a long-wave infrared image and the ambient temperature;
carrying out face detection on each frame of visible light image, and calculating the distance between a target face and equipment according to the detected visible light face image;
through calculation, finding a region corresponding to the visible light face image in the infrared image, measuring the temperature of the region, and giving an alarm when the number of pixels exceeding a certain critical temperature in the region reaches a rated value;
recording the measured environmental temperature, the human face distance and the human face reference temperature as a group of sample data, calculating the human body temperature of a body to be measured in the current working scene according to the measured multi-sample data and a machine learning algorithm, and displaying the human face position and the human body temperature in a visible light image and an infrared image;
the device automatically generates a high-temperature alarm threshold value according to stored sample data, alarms suspected high-temperature targets appearing in a scene, marks the targets in a red block diagram in visible light and infrared images, indicates the targets by using laser signals safe to people, and simultaneously takes a snapshot and records the high-temperature targets.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. A wide-area temperature screening apparatus, comprising: the device comprises a device main body and a display control device; the apparatus main body further includes: a visible light camera and a thermal imager for measuring temperature;
the visible light camera is used for capturing an image of a preset part of the object to be detected and sending the captured image to the display control equipment;
the thermal temperature measurement imager is used for detecting the temperature information of the object to be detected and sending the temperature information to the display and control equipment;
and the display control equipment is used for judging whether to give an alarm or not according to the distance information between the object to be detected and the thermal imager, the temperature information and a preset temperature threshold value, superposing the image of the preset part of the object to be detected, captured by the visible light camera, with the temperature data of the object to be detected, detected by the thermal imager, and displaying in real time.
2. The apparatus of claim 1, further comprising: a temperature indicator;
the display control equipment is also used for triggering the temperature indicator to start when the temperature data of the body to be detected is judged to exceed the preset temperature threshold, and highlighting the image and the temperature data of the preset part of the body to be detected, of which the temperature data exceeds the preset temperature threshold, through control;
the temperature indicator is used for emitting laser to the body to be measured with the temperature data exceeding the preset temperature threshold value and tracking the body to be measured in real time according to control so that related personnel can position the body to be measured.
3. The apparatus of claim 1, further comprising: the baffle is arranged at the infrared lens of the thermal temperature measurement imager, a temperature sensor is arranged in the baffle, and the thermal temperature measurement imager is corrected based on the ambient temperature information measured by the temperature sensor.
4. The apparatus of claim 1,
the display control equipment is further used for counting and analyzing the received temperature information of the body to be measured and respectively determining preset temperature thresholds at different distances from the thermal imager.
5. The apparatus of claim 1,
the display and control equipment is further used for selecting a preset number of temperature information according to a preset selection rule from the latest received temperature information of the body to be detected based on different distances from the thermal imager, determining a preset temperature threshold value at the corresponding distance according to the average value of the preset number of temperature information, and comparing the temperature information at the different distances with the preset temperature threshold value corresponding to the distance to judge whether to alarm or not.
6. The apparatus of claim 5,
the preset selection rule is a principle that the numerical value of the temperature information is the highest.
7. The apparatus of claim 5,
the display control equipment is further used for determining the distance between the object to be measured and the visible light camera according to the pixels of the image, determining the actual temperature information of the object to be measured based on a preset distance temperature classification table, comparing the actual temperature information with the preset temperature threshold value, judging whether the actual temperature information is larger than the preset temperature threshold value or not, and if yes, giving an alarm.
8. The apparatus of claim 1, further comprising: a tripod;
the tripod is used for supporting the equipment main body.
9. The apparatus according to any one of claims 1 to 8,
the detector in the thermal imaging temperature measurement system is a detector with more than 384 × 288 elements, and the temperature measurement angle is 30 degrees × 24 degrees.
10. The apparatus according to any one of claims 1 to 8,
the body to be measured is a human body, and the head of the preset part is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010564545.0A CN111664946A (en) | 2020-06-19 | 2020-06-19 | Wide-area temperature screening equipment |
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| CN202010564545.0A CN111664946A (en) | 2020-06-19 | 2020-06-19 | Wide-area temperature screening equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175996A (en) * | 2021-05-19 | 2021-07-27 | 云从科技集团股份有限公司 | Temperature monitoring method and device, computer readable storage medium and computer equipment |
| SE2051080A1 (en) * | 2020-09-16 | 2022-03-17 | Bmp Innovation Ab | Method and device for detecting a temperature of a subject |
-
2020
- 2020-06-19 CN CN202010564545.0A patent/CN111664946A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE2051080A1 (en) * | 2020-09-16 | 2022-03-17 | Bmp Innovation Ab | Method and device for detecting a temperature of a subject |
| SE545401C2 (en) * | 2020-09-16 | 2023-08-01 | Bmp Innovation Ab | Method and device for detecting a temperature of a person capturing a visual and a thermal image |
| CN113175996A (en) * | 2021-05-19 | 2021-07-27 | 云从科技集团股份有限公司 | Temperature monitoring method and device, computer readable storage medium and computer equipment |
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