Face tracking based temperature measurement device and method

Abstract

The application provides a body temperature measuring device and method based on face tracking, wherein the body temperature measuring device based on face tracking comprises a fixing seat, a camera, a holder, a temperature measuring element, a distance measuring element and a controller; the bottom of the holder is rotationally connected with the fixing seat; the temperature measuring element, the distance measuring element and the camera are fixedly installed on the holder; and the controller is electrically connected with the camera, the temperature measuring element and the distance measuring element. The body temperature measuring device and method based on face tracking can meet the measurement accuracy, reduce manual operation, save manual labor, and reduce the risk of infection of personnel.

Description

Technical Field

[0001] This application relates to the field of measurement technology, and more specifically, to a body temperature measurement device and method based on face tracking. Background Technology

[0002] Currently, humanity is constantly threatened by infectious diseases, especially highly pathogenic viruses such as SARS and novel coronavirus. Once discovered, various measures are needed to prevent the spread of the epidemic. Among these measures, using temperature measurement devices to monitor the body temperature of people passing through crowded places such as long-distance bus stations, subway stations, high-speed rail stations, and airports is one of the most economical means of epidemic prevention and control.

[0003] In the existing technology, there are two commonly used body temperature measurement instruments. One is a handheld body temperature measuring instrument based on an infrared temperature sensor, and the other is a body temperature measurement gate based on infrared thermal imaging, which automatically measures the body temperature of the target when the target passes through the body temperature measurement gate.

[0004] The inventors discovered during their research that handheld thermometers require a dedicated person to hold the device, which is a significant physical challenge and increases the risk of infection for the person handling it. Furthermore, temperature measurement gates, which use infrared thermal imaging technology, suffer from poor temperature measurement accuracy and therefore fail to meet epidemic prevention and control requirements. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a body temperature measurement device and method based on face tracking, so as to meet the measurement accuracy while reducing manual operation and lowering the risk of personnel infection.

[0006] The first aspect of this application discloses a body temperature measurement device based on face tracking, the device including a fixed base, a camera, a pan-tilt unit, a temperature measuring element, a distance measuring element, and a controller;

[0007] The bottom of the gimbal is rotatably connected to the fixed base;

[0008] The temperature measuring device, the distance measuring device, and the camera are fixedly mounted on the pan-tilt unit;

[0009] Furthermore, the controller is electrically connected to the camera, the temperature measuring device, and the distance measuring device.

[0010] In the first aspect of this application, the facial information of the person being measured can be tracked and located by means of a pan-tilt unit, a camera, a rangefinder, a controller, and a rangefinder. Then, the temperature of the person's forehead can be accurately detected based on the facial information of the person being measured and the temperature measuring device, thereby completing the temperature measurement of the person being measured.

[0011] As an optional implementation, the imaging center axis of the camera is parallel to the infrared emission axis of the temperature measuring device and the center axis of the rangefinder.

[0012] In this optional embodiment, setting the imaging center axis of the camera to be parallel to the infrared emission axis of the temperature measuring device and the center axis of the ranging device can further improve the accuracy of facial information recognition of the person being measured, thereby further improving the accuracy of temperature measurement.

[0013] As an optional implementation, the temperature measuring device includes an infrared emitter, the emission axis of which is aligned with the imaging center axis of the camera.

[0014] In this optional embodiment, the temperature of the person being tested can be measured using an infrared emitter.

[0015] In one optional embodiment, the mounting base includes a rotating shaft and a base body, with one end of the rotating shaft connected to the base body and the other end of the rotating shaft rotatably connected to the gimbal. In this optional embodiment, the gimbal can rotate via the rotating shaft and the base body.

[0016] As an optional implementation, the gimbal includes a platform body, a support frame, a fixing component, and a connecting shaft passing through the platform body;

[0017] Both ends of the connecting shaft are connected to the lower end of the support frame;

[0018] The upper end of the support frame is connected to the fixing member;

[0019] The temperature measuring device, the distance measuring device, and the camera are all mounted in the fixing component.

[0020] In this optional embodiment, the temperature measuring device, the distance measuring device, and the camera can be fixedly installed using fasteners.

[0021] As an alternative implementation, the fastener is spherical. Spherical fasteners offer the advantage of easy installation and rotation.

[0022] As an optional implementation, the front end of the fixing member is provided with a transmitting port and a receiving port, the ray of the ranging member is emitted from the transmitting port, and the ranging member receives the reflected ray from the receiving port.

[0023] As an optional implementation, the support frame includes two vertical rods, one of which has its lower end connected to one end of the connecting shaft, and the other of which has its lower end connected to the other end of the connecting shaft.

[0024] Furthermore, the support frame also includes a crossbar, one end of which is connected to the upper end of one of the vertical bars, and the other end of which is connected to the upper end of another vertical bar.

[0025] Furthermore, the fixing member is fixedly connected to the middle of the crossbar. In this optional embodiment, the fixing member can be connected to the rotating table via the vertical bar, the crossbar, and the connecting shaft.

[0026] The second aspect of this application discloses a body temperature measurement method based on face tracking, which is applied to the body temperature measurement device based on face tracking disclosed in the first aspect of this application. The method includes the following steps:

[0027] The camera captures images of the target person's face;

[0028] The controller detects faces in the image of the target face using a face recognition algorithm and identifies key points of the face;

[0029] The controller calculates the center pixel coordinates of the forehead based on the key points of the face and uses them as the first coordinates.

[0030] The rangefinder measures the straight-line distance between the target face and the camera;

[0031] The controller calculates the imaging pixel coordinates of the infrared point of the temperature measuring element on the camera screen based on the straight-line distance and the pre-calibrated equipment parameters, and uses it as the second coordinate.

[0032] The controller calculates the pixel difference between the first coordinate and the second coordinate;

[0033] When the pixel difference does not meet the preset conditions, the controller calculates the speed and direction of the gimbal rotation based on the pixel difference;

[0034] The pan-tilt unit drives the camera to rotate at the speed and in the direction until the pixel difference meets the preset condition, so that the infrared light of the temperature measuring device falls on the forehead of the target face.

[0035] The temperature measuring device acquires the forehead temperature of the target face.

[0036] In the second aspect of this application, the face-tracking-based body temperature measurement method can acquire an image of a target face, then detect the face in the image of the target face and identify the key points of the face according to a face recognition algorithm, and then calculate the center pixel coordinates of the forehead based on the key points of the face and use them as the first coordinates. At the same time, the face-tracking-based body temperature measurement method can calculate the imaging pixel coordinates of the infrared spot of the temperature measuring device on the camera screen based on the straight-line distance between the target face and the camera and the pre-calibrated device parameters and use them as the second coordinates. Furthermore, the face-tracking-based body temperature measurement method can determine that the infrared spot of the temperature measuring device is on the forehead of the target face based on the pixel difference between the first coordinates and the second coordinates, thereby obtaining the forehead temperature of the target face.

[0037] As an optional implementation, the pre-calibrated device parameters are the motion trajectory of the infrared rays falling on the camera screen at different distances, representing the coordinates of the imaging pixels.

[0038] In this optional embodiment, by pre-calibrating the device parameters, it is convenient to calculate the imaging pixel coordinates of the infrared point of the temperature measuring element on the camera screen based on the straight-line distance between the target face and the camera and the pre-calibrated device parameters, and use them as the second coordinates.

[0039] This application provides a face-tracking-based temperature measurement device and method, employing components such as a camera, pan-tilt unit, temperature measuring device, rangefinder, and controller. It can automatically track faces and accurately measure forehead temperature. Compared to existing technologies, this application eliminates the need for manual handheld operation and accurately measures forehead temperature, reducing physical exertion and the risk of viral infection. Existing handheld temperature measuring devices require a dedicated person to hold the device, resulting in significant physical exertion and increasing the risk of infection. Furthermore, existing temperature measurement gates, using infrared thermal imaging technology, suffer from poor temperature measurement accuracy and thus fail to meet epidemic prevention requirements. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a body temperature measurement device based on face tracking disclosed in an embodiment of this application;

[0042] Figure 2This is a schematic flowchart of a face tracking-based body temperature measurement method disclosed in an embodiment of this application;

[0043] Figure 3 This is a schematic flowchart of a device parameter calibration method disclosed in an embodiment of this application;

[0044] The attached figures are labeled as follows:

[0045] 1. Base; 2. Rotating platform; 3. Rotating shaft; 4. Connecting shaft; 5. Camera; 6. Vertical rod; 71. Transmitter port; 72. Receiver port; 8. Fixing component; 9. Temperature measuring component. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0047] Example 1

[0048] Please see Figure 1 , Figure 1 This is a schematic diagram of a body temperature measurement device based on face tracking disclosed in an embodiment of this application. Figure 1 As shown, the face-tracking-based body temperature measurement device includes a mounting base, a camera 3, a pan-tilt unit, a temperature measuring element 9, a ranging element, and a controller, wherein:

[0049] The bottom of the gimbal is rotatably connected to the fixed base;

[0050] Temperature measuring component 9, distance measuring component, and camera 3 are fixedly mounted on the pan-tilt unit;

[0051] In addition, the controller is electrically connected to camera 3, temperature measuring device 9, and distance measuring device.

[0052] In this embodiment, the controller includes a detection module, a first calculation module, a second calculation module, and a third calculation module. The detection module is used to detect the face in the image of the target face and identify the key points of the face according to the face recognition algorithm. The first calculation module is used to calculate the imaging pixel coordinates of the infrared point of the temperature measuring device on the camera screen according to the straight-line distance and the pre-calibrated device parameters, and use them as the second coordinates. The second calculation module is used to calculate the imaging pixel coordinates of the infrared point of the temperature measuring device on the camera screen according to the straight-line distance and the pre-calibrated device parameters, and use them as the second coordinates. The third calculation module is used by the controller to calculate the speed and direction of the gimbal rotation based on the pixel difference.

[0053] In this embodiment, the controller is also electrically connected to a power supply, which supplies power to the controller.

[0054] In this embodiment, the gimbal, camera 3, rangefinder, controller, and rangefinder can track and locate the facial information of the person being measured. Then, the temperature of the person's forehead can be accurately detected based on the facial information and temperature measuring device 9, thereby completing the temperature measurement of the person being measured.

[0055] As an optional implementation, the imaging center axis of the camera 3 is parallel to the infrared emission axis of the temperature measuring device 9 and the center axis of the rangefinder.

[0056] In this optional embodiment, setting the imaging center axis of the camera 3 to be parallel to the infrared emission axis of the temperature measuring device 9 and the center axis of the ranging device can further improve the accuracy of facial information recognition of the person being measured, thereby further improving the accuracy of temperature measurement.

[0057] As an optional implementation, the temperature measuring device 9 includes an infrared emitter, the emission axis of which is aligned with the imaging center axis of the camera 3.

[0058] In this optional embodiment, the temperature of the person being tested can be measured using an infrared emitter.

[0059] As an optional implementation, the mounting base includes a rotating shaft, a base body 1, and a drive motor installed in the base body 1. One end of the rotating shaft is connected to the drive motor in the base body 1, and the other end of the rotating shaft is rotatably connected to the gimbal. In this way, the rotating shaft can drive the gimbal to rotate by rotating the drive motor.

[0060] In this optional embodiment, the drive motor is electrically connected to the controller, wherein the controller can input control commands to the drive motor to control the rotation of the drive motor.

[0061] As an optional implementation, the gimbal includes a platform body, a support frame, a fixing component 8, and a connecting shaft 4 that passes through the platform body;

[0062] Both ends of the connecting shaft 4 are connected to the lower end of the support frame;

[0063] The upper end of the support frame is connected to the fixing component 8;

[0064] Temperature measuring component 9, distance measuring component, and camera 3 are all installed in the fixing component 8.

[0065] In this optional embodiment, the temperature measuring element 9, the distance measuring element, and the camera 3 can be fixedly installed by the fastener 8.

[0066] As an alternative implementation, the fastener 8 is spherical. The spherical fastener 8 has the advantage of being easy to install and rotate.

[0067] As an optional implementation, the front end of the fixing member 8 is provided with a transmitting port 71 and a receiving port 72. The rays of the ranging member are emitted from the transmitting port 71, and the ranging member receives the reflected rays from the receiving port 72.

[0068] As an optional implementation, the support frame includes two vertical rods 6, the lower end of one vertical rod 6 is connected to one end of the connecting shaft 4, and the lower end of the other vertical rod 6 is connected to the other end of the connecting shaft 4.

[0069] Furthermore, the support frame also includes a crossbar, one end of which is connected to the upper end of a vertical bar 6, and the other end of which is connected to the upper end of another vertical bar 6.

[0070] Furthermore, the fixing member 8 is fixedly connected to the middle of the crossbar. In this optional embodiment, the fixing member 8 can be connected to the rotating table 2 via the vertical bar 6, the crossbar, and the connecting shaft 4.

[0071] This application provides a face-tracking-based temperature measurement device that employs components such as a camera, pan-tilt unit, temperature measuring element, rangefinder, and controller. It can automatically track faces and accurately measure forehead temperature. Compared to existing technologies, this application eliminates the need for manual handheld operation and accurately measures forehead temperature, thereby reducing physical exertion and the risk of viral infection. Existing handheld temperature measuring devices require a dedicated person to hold the device, resulting in significant physical exertion and increasing the risk of infection. Furthermore, existing temperature measurement gates, which utilize infrared thermal imaging technology, suffer from poor temperature measurement accuracy and thus fail to meet epidemic prevention requirements.

[0072] Example 2

[0073] Please see Figure 2 , Figure 2 This is a flowchart illustrating a face-tracking-based body temperature measurement method disclosed in an embodiment of this application. Figure 2As shown, the face-tracking-based body temperature measurement method includes the following steps:

[0074] 101. The camera captures an image of the target person's face;

[0075] 102. The controller detects faces in the image of the target face and identifies key points of the face based on the face recognition algorithm;

[0076] 103. Calculate the center pixel coordinates of the forehead based on the key points of the face and use them as the first coordinate;

[0077] 104. The rangefinder measures the straight-line distance between the target face and the camera;

[0078] 105. The controller calculates the imaging pixel coordinates of the infrared point of the temperature measuring element on the camera screen based on the straight-line distance and the pre-calibrated equipment parameters, and uses them as the second coordinate.

[0079] 106. The controller calculates the pixel difference between the first and second coordinates;

[0080] 107. When the pixel difference does not meet the preset conditions, the controller calculates the speed and direction of the gimbal rotation based on the pixel difference;

[0081] 108. The pan-tilt unit drives the camera to rotate according to the speed and direction until the pixel difference meets the preset conditions, so that the infrared light of the temperature measuring device falls on the forehead of the target face.

[0082] 109. The temperature measuring device acquires the forehead temperature of the target face.

[0083] In this embodiment, the face-tracking-based body temperature measurement method can acquire an image of a target face, then detect the face in the image of the target face and identify the key points of the face according to a face recognition algorithm. It can then calculate the center pixel coordinates of the forehead based on the key points of the face and use them as the first coordinate. Simultaneously, the face-tracking-based body temperature measurement method can calculate the imaging pixel coordinates of the infrared point of the temperature measuring device on the camera screen based on the straight-line distance between the target face and the camera and pre-calibrated device parameters, and use them as the second coordinate. Furthermore, the face-tracking-based body temperature measurement method can determine that the infrared point of the temperature measuring device is on the forehead of the target face based on the pixel difference between the first and second coordinates, thereby obtaining the forehead temperature of the target face.

[0084] As an optional implementation, the pre-calibrated device parameters are the motion trajectory of the infrared point of the temperature measuring element on the imaging pixel coordinates of the camera screen at different distances.

[0085] In this optional embodiment, by pre-calibrating the device parameters, it is convenient to calculate the imaging pixel coordinates of the infrared point of the temperature measuring element on the camera screen based on the straight-line distance between the target face and the camera and the pre-calibrated device parameters, and use them as the second coordinates.

[0086] Specifically, please refer to Figure 3 , Figure 3 This is a flowchart illustrating a device parameter calibration method disclosed in an embodiment of this application, as shown below. Figure 3 As shown, the device parameter calibration method includes the following steps:

[0087] 201. Fix the constant temperature module on the bracket that can be finely adjusted up, down, left, right, forward, and backward;

[0088] 202. Rotate the pan-tilt head to align the camera and temperature measuring device with the constant temperature module;

[0089] 203. Set the temperature of the constant temperature module to a specified temperature that is significantly different from the ambient temperature, and keep it constant.

[0090] 204. Fine-tune the constant temperature module at equal intervals up, down, left, and right, and turn on the temperature measuring device to measure the temperature; record the pixel coordinates of the center of the constant temperature module on the camera screen when all the measured temperatures are equal to the specified temperature. The above pixel coordinates form a regular dot matrix on the camera screen.

[0091] 205. Take the center of the dot matrix as the imaging pixel coordinates of the infrared point of the temperature measuring device at that distance on the camera screen;

[0092] 206. Move the bracket back and forth in any step length, and repeat steps 204 and 205 to obtain the imaging pixel coordinates of the infrared point of the temperature measuring device at the new distance on the camera screen.

[0093] 207. Using the least squares method, fit the imaging pixel coordinates obtained from multiple distance measurements to the motion trajectory of the infrared point of the temperature measuring device on the camera screen at different distances.

[0094] It is evident that the equipment parameters used to calculate the second coordinate can be obtained through the equipment parameter calibration method.

[0095] This application provides a face-tracking-based temperature measurement device that employs components such as a camera, pan-tilt unit, temperature measuring element, rangefinder, and controller. It can automatically track faces and accurately measure forehead temperature. Compared to existing technologies, this application eliminates the need for manual handheld operation and accurately measures forehead temperature, thereby reducing physical exertion and the risk of viral infection. Existing handheld temperature measuring devices require a dedicated person to hold the device, resulting in significant physical exertion and increasing the risk of infection. Furthermore, existing temperature measurement gates, which utilize infrared thermal imaging technology, suffer from poor temperature measurement accuracy and thus fail to meet epidemic prevention requirements.

[0096] This application provides a face-tracking-based temperature measurement method. Using components such as a camera, pan-tilt unit, temperature measuring device, rangefinder, and controller, it can automatically track faces and accurately measure forehead temperature. Compared to existing technologies, this method eliminates the need for manual handheld operation and accurately measures forehead temperature, reducing physical exertion and the risk of viral infection. Existing handheld temperature measuring devices require a dedicated person to hold the device, resulting in significant physical exertion and increasing the risk of infection. Furthermore, existing temperature measurement gates, which use infrared thermal imaging technology, suffer from poor temperature measurement accuracy and thus fail to meet epidemic prevention requirements.

[0097] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0098] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0099] In addition, the functional units in the embodiments provided in this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0100] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0101] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0102] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A body temperature measurement device based on face tracking, characterized in that, The device includes a mounting base, a camera, a pan-tilt unit, a temperature measuring device, a distance measuring device, and a controller; The bottom of the gimbal is rotatably connected to the fixed base; The temperature measuring device, the distance measuring device, and the camera are fixedly mounted on the pan-tilt unit; Furthermore, the controller is electrically connected to the camera, the temperature measuring device, and the ranging device, wherein the ranging device is used to measure the straight-line distance between the target face and the camera, so that the infrared light from the temperature measuring device falls on the forehead of the target face; Furthermore, the imaging center axis of the camera is parallel to the infrared emission axis of the temperature measuring device and the center axis of the ranging device. The controller is used for: The camera captures images of the target person's face; The controller detects faces in the image of the target face using a face recognition algorithm and identifies key points of the face; The controller calculates the center pixel coordinates of the forehead based on the key points of the face and uses them as the first coordinates. The rangefinder measures the straight-line distance between the target face and the camera; The controller calculates the imaging pixel coordinates of the infrared point of the temperature measuring element on the camera screen based on the straight-line distance and the pre-calibrated equipment parameters, and uses it as the second coordinate. The controller calculates the pixel difference between the first coordinate and the second coordinate; When the pixel difference does not meet the preset conditions, the controller calculates the speed and direction of the gimbal rotation based on the pixel difference; The pan-tilt unit drives the camera to rotate at the speed and in the direction until the pixel difference meets the preset condition, so that the infrared light of the temperature measuring device falls on the forehead of the target face, and the imaging center axis of the camera is parallel to the infrared emission axis of the temperature measuring device and the center axis of the ranging device. The temperature measuring device acquires the forehead temperature of the target face; Furthermore, the pre-calibrated device parameters are obtained in the following manner: Fix the temperature control module on a bracket that can be finely adjusted up, down, left, right, forward, and backward; Rotate the pan-tilt head to align the camera and temperature measuring device with the temperature control module; Set the temperature of the thermostat module to a specified temperature that is significantly different from the ambient temperature, and keep it constant. Fine-tune the constant temperature module at equal intervals up, down, left, and right, and turn on the temperature measuring device to measure the temperature; record the pixel coordinates of the center of the constant temperature module on the camera screen when all the measured temperatures are equal to the specified temperature, and the above pixel coordinates form a regular dot matrix on the camera screen. The center of the dot matrix is ​​taken as the imaging pixel coordinates of the infrared point of the temperature measuring device at that distance on the camera screen; Move the bracket back and forth in any step length, and repeat the steps to fine-tune the constant temperature module at equal intervals in the up, down, left and right directions, and turn on the temperature measuring device to measure the temperature; record the pixel coordinates of the center of the constant temperature module on the camera screen when all the measured temperatures are equal to the specified temperature, and the above pixel coordinates form a regular dot matrix on the camera screen. The center of the dot matrix is ​​taken as the imaging pixel coordinates of the infrared point of the temperature measuring device at that distance on the camera screen, and the imaging pixel coordinates of the infrared point of the temperature measuring device at the new distance on the camera screen are obtained. The imaging pixel coordinates measured at multiple distances are used to fit the motion trajectory of the infrared rays falling on the camera screen at different distances using the least squares method.

2. The body temperature measurement device based on face tracking as described in claim 1, characterized in that, The temperature measuring device includes an infrared emitter, the emission axis of which is aligned with the imaging center axis of the camera.

3. The body temperature measurement device based on face tracking as described in claim 1, characterized in that, The fixed base includes a rotating shaft and a base body. One end of the rotating shaft is connected to the base body, and the other end of the rotating shaft is rotatably connected to the gimbal.

4. The body temperature measurement device based on face tracking as described in claim 1, characterized in that, The gimbal includes a platform body, a support frame, a fixing component, and a connecting shaft passing through the platform body; Both ends of the connecting shaft are connected to the lower end of the support frame; The upper end of the support frame is connected to the fixing member; The temperature measuring device, the distance measuring device, and the camera are all mounted in the fixing component.

5. The body temperature measurement device based on face tracking as described in claim 4, characterized in that, The fastener is spherical.

6. The body temperature measurement device based on face tracking as described in claim 4, characterized in that, The front end of the fixing member is provided with a transmitting port and a receiving port. The rays of the ranging device are emitted from the transmitting port, and the ranging device receives the reflected rays from the receiving port.

7. The body temperature measurement device based on face tracking as described in claim 4, characterized in that, The support frame includes two vertical rods, one of which has its lower end connected to one end of the connecting shaft, and the other of which has its lower end connected to the other end of the connecting shaft.

8. The body temperature measurement device based on face tracking as described in claim 7, characterized in that, The support frame also includes a crossbar, one end of which is connected to the upper end of one of the vertical bars, and the other end of which is connected to the upper end of another vertical bar.

9. The body temperature measurement device based on face tracking as described in claim 8, characterized in that, The fastener is fixedly connected to the middle of the crossbar.

10. The body temperature measurement device based on face tracking as described in claim 1, characterized in that, The pre-calibrated device parameters are the motion trajectory of the infrared rays falling on the camera screen at different distances, representing the coordinates of the imaging pixels.

Images