CN111297336B - Body temperature measuring method and device based on infrared and terahertz and security check equipment - Google Patents

Body temperature measuring method and device based on infrared and terahertz and security check equipment Download PDF

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CN111297336B
CN111297336B CN202010112143.7A CN202010112143A CN111297336B CN 111297336 B CN111297336 B CN 111297336B CN 202010112143 A CN202010112143 A CN 202010112143A CN 111297336 B CN111297336 B CN 111297336B
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terahertz
temperature
human body
infrared
brightness
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CN111297336A (en
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赵自然
陈志强
李元景
王迎新
李亮
刘以农
张丽
李君利
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Tsinghua University
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/0507—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves  using microwaves or terahertz waves

Abstract

The embodiment of the application provides a body temperature measuring method, a body temperature measuring device and safety inspection equipment based on infrared and terahertz, wherein the method comprises the following steps: acquiring the infrared brightness temperature of a first part of a detected human body; wherein the first part is a naked part; acquiring the terahertz brightness temperature of a first part of the detected human body and the terahertz brightness temperature of a second part of the detected human body; wherein the second location is a different location than the first location; and calibrating the terahertz brightness temperature of the second part according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part to obtain the body temperature of the detected human body. Therefore, the measurement accuracy of the human body temperature can be improved.

Description

Body temperature measuring method and device based on infrared and terahertz and security check equipment
Technical Field
The application relates to the field of testing, in particular to a body temperature measuring method and device based on infrared and terahertz and security check equipment.
Background
At present, in body temperature quarantine areas such as public places, border ports, airports, customs and the like, in order to distinguish whether the temperature of personnel in the body temperature quarantine areas is normal or not, security inspectors usually hold an infrared temperature detector in a hand or use an infrared thermal imager to measure the body temperature of each detected personnel.
In practical application, the infrared body temperature measurement mode can only measure the temperature of the exposed skin of a human body, and is greatly influenced by external environments such as air temperature, air flow and the like, so that the measurement accuracy of the real temperature of the human body (also called the human body temperature or the body temperature for short) is reduced.
Disclosure of Invention
In view of this, the embodiment of the present application provides a body temperature measurement method and device based on infrared and terahertz, and a security check device, which can improve the measurement accuracy of the real temperature of a human body.
The embodiment of the application mainly provides the following technical scheme:
in a first aspect, an embodiment of the present application provides an infrared and terahertz-based body temperature measurement method, including: acquiring the infrared brightness temperature of a first part of a detected human body; wherein the first part is a naked part; acquiring the terahertz brightness temperature of a first part of the detected human body and the terahertz brightness temperature of a second part of the detected human body; wherein the second location is a different location than the first location; and calibrating the terahertz brightness temperature of the second part according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part to obtain the body temperature of the detected human body.
In a second aspect, an embodiment of the present application provides an infrared and terahertz based body temperature measurement device, which includes: the first acquisition unit is used for acquiring the infrared brightness temperature of a first part of a detected human body; wherein the first part is a naked part; the second acquisition unit is used for acquiring the terahertz brightness temperature of the first part of the measured human body and the terahertz brightness temperature of the second part of the measured human body; wherein the second location is a different location than the first location; and the first obtaining unit is used for calibrating the terahertz brightness temperature of the second part according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part to obtain the body temperature of the detected human body.
In a third aspect, an embodiment of the present application provides a security inspection apparatus based on infrared and terahertz, where the security inspection apparatus includes: terahertz-based detection devices and infrared and terahertz-based body temperature measurement devices as described above; wherein the detection device comprises: the third acquisition unit is used for acquiring a terahertz image of the detected human body; and the third determining unit is used for determining whether the detected human body is suspected to hide a suspected object or not based on the terahertz image.
In a fourth aspect, the present application provides a computer-readable storage medium, where the storage medium includes a stored program, where the program, when executed, controls an electronic device where the storage medium is located to perform the steps of the infrared and terahertz-based body temperature measurement method.
In a fifth aspect, an embodiment of the present application provides an electronic device, where the electronic device includes: at least one processor; and at least one memory, bus connected with the processor; the processor and the memory complete mutual communication through the bus; the processor is used for calling the program instructions in the memory so as to execute the steps of the infrared and terahertz-based body temperature measuring method.
According to the infrared and terahertz-based body temperature measuring method, device and security check equipment provided by the embodiment of the application, the terahertz brightness temperature of the second part of the detected human body is calibrated through the infrared brightness temperature of the first part of the detected human body and the terahertz brightness temperature of the first part of the detected human body, wherein the first part is a naked part, and the second part is a part different from the first part, so that the accurate body temperature of the detected human body can be obtained. Thus, the accuracy of measuring the temperature of the human body is improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a first schematic flow chart of a body temperature measurement method based on infrared and terahertz in an embodiment of the present application;
fig. 2 is a second schematic flowchart of a body temperature measurement method based on infrared and terahertz in the embodiment of the present application;
fig. 3 is a third schematic flowchart of a body temperature measurement method based on infrared and terahertz in the embodiment of the present application;
FIG. 4 is a schematic structural diagram of an infrared and terahertz based body temperature measuring device in an embodiment of the present application;
fig. 5 is a first schematic structural diagram of a security inspection apparatus in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a security inspection apparatus in the embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
The embodiment of the application provides a body temperature measuring method based on infrared and terahertz. In practical application, the body temperature measuring method based on the infrared and terahertz can be applied to various occasions needing to measure the temperature of the human body in the body temperature inspection areas such as public places with dense people streams, border ports, airports, customs and the like.
In the embodiment of the present application, the luminance temperature may be simply referred to as "luminance temperature". Specifically, if the spectral radiation intensities of the real object and the black body (a virtual standard object used for the thermal radiation research and not depending on specific physical properties) are equal at the same wavelength, the temperature of the black body at this time is referred to as the luminance temperature of the real object at the wavelength.
Fig. 1 is a first schematic flow chart of a body temperature measurement method based on infrared and terahertz in an embodiment of the present application, and referring to fig. 1, the body temperature measurement method based on infrared and terahertz may include:
step 101: and acquiring the infrared brightness temperature of the first part of the detected human body.
Wherein, the first part of the detected human body is a naked part.
Here, the infrared brightness temperature of the first part of the human body to be measured refers to the brightness temperature of the first part of the human body to be measured in the infrared band.
In other implementations of the present application, the step S101 may include: acquiring an infrared image of a detected human body; performing image processing on the infrared image, and determining a target infrared image area where a first part of the detected human body is located; and determining the infrared brightness temperature of the first part of the detected human body from the target infrared image area.
In a specific implementation process, the implementation manner of determining the infrared brightness temperature of the first part of the detected human body according to the target infrared image area where the first part of the detected human body is located in the infrared image of the detected human body may exist but is not limited to the following four manners:
in an exemplary embodiment, an average value of pixel values of all pixel points in the target infrared image area may be determined as the infrared brightness temperature of the first portion of the detected human body.
In an exemplary embodiment, the maximum pixel value of all pixel values corresponding to all pixel points in the target infrared image area may be determined as the infrared brightness temperature of the first portion of the measured human body.
In an exemplary embodiment, the pixel value of a specific pixel point in the target infrared image area may be determined as the infrared brightness temperature of the first part of the detected human body.
In an exemplary embodiment, the pixel value of any one pixel point in the target infrared image area may be determined as the infrared brightness temperature of the first part of the detected human body.
Of course, there may be other implementation manners besides the above-listed four manners, and the embodiments of the present application are not specifically limited herein.
In practical application, when the infrared and terahertz-based body temperature measurement method provided by the embodiment of the application is applied to a security check device, an infrared image of a detected human body can be acquired through an infrared imaging device in the security check device. For example, the infrared imaging device can collect infrared radiation emitted by a detected human body; converting the infrared radiation of the detected human body into an analog signal of the detected human body under an infrared band; processing the analog signal of the human body to be detected in the infrared band to obtain a digital signal of the human body to be detected in the infrared band; and processing the digital signal of the measured human body in the infrared band to obtain an imaging picture of the measured human body in the infrared band. Thus, an infrared image of the measured human body is obtained.
Step 102: the method comprises the steps of obtaining the terahertz brightness temperature of a first part of a detected human body and the terahertz brightness temperature of a second part of the detected human body.
Wherein the second portion is a different portion from the first portion.
Here, the terahertz brightness temperature of the first portion refers to the brightness temperature of the first portion of the measured human body in the terahertz waveband, and the terahertz brightness temperature of the second portion refers to the brightness temperature of the second portion of the measured human body in the terahertz waveband.
In other implementations of the present application, the step S102 may include: obtaining a terahertz image of a detected human body; performing image processing on the terahertz image, and determining a first target terahertz image area where a first part of a detected human body is located and a second target terahertz image area where a second part of the detected human body is located; determining the terahertz brightness temperature of a first part from a first target terahertz image region; and determining the terahertz brightness temperature of the second part from the second target terahertz image region.
Similar to the implementation manner of determining the infrared brightness temperature of the first part of the detected human body, in the specific implementation process, according to the first target terahertz image region where the first part of the detected human body is located in the terahertz image of the detected human body and the second target terahertz image region where the second part of the detected human body is located, the terahertz brightness temperature of the first part of the detected human body is determined, and the implementation manner of determining the terahertz brightness temperature of the second part of the detected human body is determined, which may include, but is not limited to, the following four manners:
in an exemplary embodiment, an average value of pixel values of all pixel points in the first target terahertz image region may be determined as the terahertz brightness temperature of the first portion of the measured human body. Similarly, the mean value of the pixel values of all the pixel points in the second target terahertz image region can be determined as the terahertz brightness temperature of the second part of the detected human body.
In an exemplary embodiment, the maximum pixel value of all pixel values corresponding to all pixel points in the first target terahertz image region can be determined as the terahertz bright temperature of the first part of the measured human body. Similarly, the maximum pixel value of all the pixel values corresponding to all the pixel points in the second target terahertz image region can be determined as the terahertz brightness temperature of the second part of the detected human body.
In an exemplary embodiment, a pixel value of a certain pixel point in the first target terahertz image region can be determined as a terahertz bright temperature of the first part of the measured human body. Similarly, the pixel value of a certain specific pixel point in the second target terahertz image region can be determined as the terahertz brightness temperature of the second part of the detected human body.
In an exemplary embodiment, the pixel value of any one pixel point in the first target terahertz image region can be determined as the terahertz bright temperature of the first part of the detected human body. Similarly, in an exemplary embodiment, the pixel value of any one pixel point in the second target terahertz image region can be determined as the terahertz brightness temperature of the second part of the detected human body.
It should be noted that the terahertz brightness temperature at the first portion and the infrared brightness temperature at the first portion are determined in the same manner. For example, if any point is selected, the terahertz brightness temperature of the first portion and the infrared brightness temperature of the first portion are selected as the brightness temperature of the same point.
Of course, there may be other implementation manners besides the above-listed four manners, and the embodiments of the present application are not specifically limited herein.
In practical application, when the infrared and terahertz-based body temperature measurement method provided by the embodiment of the application is applied to security check equipment, a terahertz image of a detected human body can be acquired by a terahertz imaging device in the security check equipment. For example, the terahertz imaging device can collect terahertz radiation emitted by a detected human body; converting terahertz radiation of a detected human body into an analog signal of the detected human body under a terahertz waveband; processing an analog signal of a measured human body under a terahertz waveband to obtain a digital signal of the measured human body under the terahertz waveband; and processing the digital signal of the measured human body in the terahertz waveband to obtain an imaging picture of the measured human body in the terahertz waveband. Thus, a terahertz image of the measured human body is obtained.
Step 103: and calibrating the terahertz brightness temperature of the second part according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part to obtain the body temperature of the detected human body.
Therefore, on one hand, because infrared cannot penetrate through clothes of the measured human body, only the brightness temperature of the exposed part of the measured human body under an infrared waveband can be measured, but the temperature of the exposed part is easily influenced by the external environment, terahertz can penetrate through the clothes of the measured human body, and the brightness temperature of the body surface of the measured human body under the clothes of the measured human body under the terahertz waveband can be measured; on the other hand, infrared imaging and terahertz imaging are combined, and the terahertz brightness temperature of the second part is calibrated through the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part, so that the body temperature of the measured human body is obtained. Thus, the accuracy of measuring the temperature of the human body can be improved.
In an exemplary embodiment, step 103 may include steps 1031 to 1034 of:
step 1031: and calculating the temperature of the first part of the detected human body according to the infrared brightness temperature of the first part.
In a specific implementation process, step 1031 may exist but is not limited to two implementation manners including:
in an exemplary embodiment, step 1031 may include: and dividing the infrared brightness temperature of the first part of the detected human body by a prestored infrared emission coefficient to obtain the temperature of the first part of the detected human body.
In practical applications, all media (e.g., gas, solid, liquid, etc.) radiate electromagnetic energy outward. The infrared emission coefficient can be used to represent the intensity of infrared radiation emitted by a target medium, such as a human body under test, in an infrared band. Therefore, the infrared brightness temperature of the human body to be measured (i.e. the brightness temperature of the human body to be measured in the infrared band) can be represented by the product of the body temperature of the human body to be measured and the infrared emission coefficient, i.e. the following formula (1).
Figure BDA0002390384480000071
Wherein, T1Indicating the temperature of a first part of the measured human body; t issIndicating the infrared brightness temperature of the first part of the detected human body;
Figure BDA0002390384480000072
representing the infrared emission coefficient.
In the practical application of the method, the material is,
Figure BDA0002390384480000073
determined experimentally by a person skilled in the art.
Then, the infrared brightness temperature T of the first part of the detected human body is acquiredsThen, the infrared emission coefficient can be known
Figure BDA0002390384480000074
Giving the infrared brightness temperature T of the first part of the measured human body by the formula (1)sDivided by prestored infrared emission coefficients
Figure BDA0002390384480000075
To obtain the temperature T of the first part of the measured human body1。
In another exemplary embodiment, step 1031 may include: calculating the temperature corresponding to the infrared brightness temperature of the first part according to a fitting curve which is generated in advance and used for representing the corresponding relation between the infrared brightness temperature and the temperature; the calculated temperature is determined as the temperature of the first portion.
In practical applications, considering that the cost of a blackbody calibration source for calibrating an infrared imaging device (such as an infrared sensor) is low, a plurality of infrared bright temperatures and a plurality of temperatures corresponding to the infrared bright temperatures can be measured in advance in an infrared blackbody calibration manner, wherein the plurality of infrared bright temperatures and the plurality of temperatures are in one-to-one correspondence; then, curve fitting is performed on the plurality of infrared light temperatures and the plurality of temperatures, and a fitting curve for representing the correspondence between the infrared light temperatures and the temperatures is generated. Then, after the infrared brightness temperature of the first part of the detected human body is obtained, the temperature corresponding to the infrared brightness temperature of the first part of the detected human body can be calculated by using the fitting curve, and then the calculated temperature is determined as the temperature of the first part.
For example, the curve fitting method may be a least square fitting method.
Of course, in addition to the two ways listed above, other predetermined operation formulas may be adopted to calculate the temperature of the first part of the measured human body according to the infrared brightness temperature of the first part of the measured human body, and the embodiment of the present application is not limited specifically here.
Step 1032: and calculating a calibration parameter according to the terahertz brightness of the first part and the temperature of the first part by presetting a first function relation.
The first function relation is preset as a function relation between the terahertz brightness temperature and the temperature when attenuation of the terahertz by the clothes is not considered. Here, the functional relationship between the terahertz brightness temperature and the temperature refers to a correspondence relationship between the terahertz brightness temperature and the temperature.
In an exemplary embodiment, a preset first functional relationship as shown in formula (2) may be set to represent a corresponding relationship between the terahertz brightness temperature and the temperature of the exposed part of the human body without being shielded by the clothes.
Figure BDA0002390384480000081
Wherein, T1Indicating the temperature of a first part of the measured human body; t isb1The terahertz brightness temperature represents a first part of a detected human body; lambda [ alpha ]2A wavelength of terahertz;
Figure BDA0002390384480000082
represents the terahertz emission coefficient, and C represents the calibration parameter.
In the practical application of the method, the material is,
Figure BDA0002390384480000083
determined experimentally by a person skilled in the art.
Due to terahertz emission coefficient
Figure BDA0002390384480000084
Wavelength lambda of terahertz2As known, the terahertz brightness temperature T of the first part of the tested human body is obtainedb1And the temperature T of the first part1Then, the terahertz brightness temperature T of the first part is measuredb1The temperature T of the first part1Terahertz emission coefficient
Figure BDA0002390384480000085
Wavelength lambda of terahertz2Substituting into equation (2) can calculate the required calibration parameter C.
Of course, other equations may be used to represent the predetermined first functional relationship, such as
Figure BDA0002390384480000086
Here, the embodiment of the present application is not particularly limited.
Step 1033: and obtaining the attenuation coefficient of the clothes of the detected human body under the terahertz wave band.
Since terahertz is emitted from a human body, attenuation occurs when terahertz penetrates through clothes. Therefore, in order to acquire a more accurate body temperature of the measured human body, it is necessary to acquire an attenuation coefficient of the clothes of the measured human body in the terahertz waveband.
Step 1034: and calculating the body temperature of the measured human body by presetting a second function relation based on the calibration parameters and the terahertz brightness and attenuation coefficient of the second part.
The preset second function relationship is a function relationship between the terahertz brightness temperature and the temperature when the attenuation of the terahertz by the clothes is considered.
In practical application, more than one functional relationship between the terahertz brightness temperature and the temperature exists. And when the terahertz is emitted by a human body and is attenuated when penetrating through clothes, the preset second functional relation shown in the following formula (3) can be set when the temperature of a second part shielded by the clothes needs to be calculated.
Figure BDA0002390384480000091
Wherein, T2Indicating the temperature of a second part of the measured human body; t isb2The terahertz brightness temperature of a second part of the detected human body is represented; lambda [ alpha ]2A wavelength of terahertz;
Figure BDA0002390384480000092
the terahertz emission coefficient is represented, C represents a calibration parameter, and mu represents the attenuation coefficient of the clothes of the tested human body in the terahertz waveband.
In the practical application of the method, the material is,
Figure BDA0002390384480000093
determined experimentally by a person skilled in the art.
Due to terahertz emission coefficient
Figure BDA0002390384480000094
Wavelength lambda of terahertz2As is known, then, the calibration parameter C, the terahertz bright temperature T at the second location is obtainedb2And attenuation coefficientAfter mu, calibrating the parameter C and the terahertz brightness temperature T of the second partb2Attenuation coefficient mu and terahertz emission coefficient
Figure BDA0002390384480000095
And terahertz wavelength lambda2Substituting into formula (3), the temperature T of the second part of the measured human body can be calculated2. Then, the temperature T of the second part of the measured human body is measured2As the required body temperature of the measured human body, a more accurate human body temperature is obtained. Therefore, on one hand, the infrared can not penetrate through the clothes of the measured human body, and only the brightness temperature of the surface of the measured human body under the infrared waveband can be measured, and the terahertz can penetrate through the clothes of the measured human body, so that the brightness temperature of the body surface of the measured human body under the clothes of the measured human body under the terahertz waveband can be measured; on the other hand, infrared imaging and terahertz imaging are combined, the temperature of the corresponding first part is calculated through the infrared bright temperature of the first part, and then calibration parameters are calculated through the temperature of the first part and the terahertz bright temperature of the first part to calibrate the terahertz bright temperature of the second part, so that the body temperature of the measured human body is obtained, and the measurement accuracy of the human body temperature can be improved.
Of course, other equations may be used to represent the predetermined second functional relationship, such as other empirical formulas to obtain the predetermined second functional relationship according to the predetermined first functional relationship and the attenuation coefficient. Here, the embodiment of the present application is not particularly limited.
How to obtain the attenuation coefficient is explained below.
In a specific implementation, step 1033 may exist, but is not limited to, including the following three implementations:
in an exemplary embodiment, step 1033 can include: acquiring a terahertz brightness temperature of a first target part of a detected human body and a terahertz brightness temperature of a second target part of the detected human body; the first target part and the second target part are human body parts which are shielded by clothes; substituting the calibration parameters and the terahertz brightness temperature of the first target part into a preset second function relation to obtain a first equation; substituting the calibration parameters and the terahertz brightness temperature of the second target part into a preset second functional relation to obtain a second equation; subtracting the first equation from the second equation to obtain a third equation; substituting the preset human body temperature difference value into a third equation to calculate an attenuation coefficient; the human body temperature difference value refers to the difference value between the temperature of the first target part and the temperature of the second target part of the human body.
In one exemplary embodiment, the first target site may be, for example, a chest. The second target site may be, for example, the abdomen.
For example, assuming that the first target portion is a chest portion and the second target portion is an abdomen portion, in order to determine the required attenuation coefficient in real time more accurately, the attenuation coefficient may be calculated in real time through a relationship between the terahertz bright temperature of the chest portion of the measured human body and the temperature of the chest portion of the measured human body, a relationship between the terahertz bright temperature of the abdomen portion of the measured human body and the temperature of the abdomen portion of the measured human body, and a temperature difference between the chest portion of the human body and the abdomen portion.
For example, when the temperature difference of the human body is known, the calibration parameter and the terahertz brightness temperature of the first target portion are substituted into the preset second functional relationship shown in formula (2), so as to obtain a first equation shown in formula (4); then, substituting the calibration parameter and the terahertz brightness temperature of the second target part into the preset second functional relationship shown in the formula (2), so as to obtain a second equation shown in the formula (5); then, subtracting the first equation shown in formula (4) from the second equation shown in formula (5) to obtain a third equation shown in formula (6); finally, the required attenuation coefficient can be calculated by substituting the known human body temperature difference value into the third equation shown in equation (6).
Figure BDA0002390384480000101
Figure BDA0002390384480000111
Figure BDA0002390384480000112
Wherein, T2' represents the temperature of a first target part of a measured human body; t is2"represents the temperature of a second target portion of the human subject under test; t isb2' represents the terahertz brightness temperature of a first target part of a detected human body; t isb2"represents the terahertz brightness temperature of the second target part of the detected human body; lambda [ alpha ]2A wavelength of terahertz;
Figure BDA0002390384480000113
the terahertz emission coefficient is represented, C represents a calibration parameter, and mu represents the attenuation coefficient of the clothes of the tested human body in the terahertz waveband.
It should be understood that, the determination method of the terahertz brightness temperature at the first target portion of the detected human body and the terahertz brightness temperature at the second target portion of the detected human body may be understood by referring to the foregoing determination method of obtaining the terahertz brightness temperature at the first target portion of the detected human body and the terahertz brightness temperature at the second target portion of the detected human body, and here, the embodiments of the present application are not described in detail.
In an exemplary embodiment, step 1033 can include: acquiring a visible light image of clothes of a detected person; matching fabric images matched with visible light images of clothes of a detected human body in a pre-stored fabric image database; and obtaining the attenuation coefficient corresponding to the matched fabric image as the attenuation coefficient of the clothes of the tested human body under the terahertz waveband according to the mapping relation between the fabric image and the attenuation coefficient.
In practical application, considering that the attenuation coefficients of clothes made of different fabrics under a terahertz waveband are different, matching the fabric image of the clothes of the detected human body by matching the visible light image of the clothes of the detected human body, and taking the attenuation coefficient corresponding to the fabric as the attenuation coefficient of the clothes of the detected human body under the terahertz waveband. Thus, an accurate attenuation coefficient can be obtained.
In an exemplary embodiment, step 1033 can include: reading a pre-stored preset attenuation coefficient from a local memory; and taking the preset attenuation coefficient as the attenuation coefficient of the clothes of the tested human body in the terahertz waveband.
In practical applications, the preset attenuation coefficient may be an empirical value that is set by a person skilled in the art in advance according to experiments.
Of course, besides the three ways listed above, other ways may also be adopted to obtain the attenuation coefficient of the clothing of the measured human body in the terahertz waveband, and here, the embodiment of the present application is not particularly limited.
In an exemplary embodiment of the present application, the first part of the measured human body is a face of the measured human body, such as forehead and the like; the second part of the human body to be measured is a trunk part of the human body to be measured, such as a chest part, which is covered by clothes.
In practical application, because the face of the detected human body is exposed and the trunk of the detected human body is covered under clothes, the first part of the detected human body can be selected as the face of the detected human body, such as the forehead, two sides of the forehead and the like, and the second part of the detected human body can be selected as the trunk of the detected human body, such as the chest, the back and the like, which is shielded by clothes. The body surface temperature of the measured human body under the clothes is not influenced by the external environment, so that the accurate body temperature of the measured human body is obtained. Thus, the accuracy of measuring the temperature of the human body is improved.
In another exemplary embodiment of the present application, the first part of the measured human body is an exposed part of the face of the measured human body, such as the forehead and the like; the second part of the human body to be detected is the face part of the human body to be detected, which is shielded by clothes, such as cheeks and the like, which are shielded by a worn mask.
In other embodiments of the present application, referring to fig. 2, after step 103, the method may further include:
step 201: determining whether the body temperature of the detected human body is greater than or equal to a preset temperature threshold value;
step 202: and if the body temperature of the detected human body is determined to be greater than or equal to the preset temperature threshold value, outputting early warning information.
Here, the warning information is used to warn the detected human body of abnormal temperature.
In practical applications, the step of outputting the warning information may include the following steps: one or more of playing preset alarm audio, displaying preset light effect, and sending an early warning notification message to a mobile terminal held by a security check worker.
In practical application, the infrared image and the terahertz image of the detected human body are used for respectively selecting the infrared bright temperature of the first part and the terahertz bright temperature of the first part of the detected human body in the two images, and then selecting the terahertz bright temperature of the second part of the detected human body in the terahertz image, so that the terahertz bright temperature of the second part is calibrated through the relation between the infrared bright temperature of the first part and the terahertz bright temperature of the first part, and the more accurate body temperature of the detected human body is obtained. Then, the body temperature of the detected human body is compared with a preset temperature threshold value, so that the detected person with abnormal body temperature can be identified and monitored. Therefore, the infection epidemic situation caused by unhealthy abnormal body temperature personnel can be effectively avoided, and the unhealthy abnormal body temperature personnel can possibly not endanger the health safety of other people.
In another embodiment of the present application, referring to fig. 3, the method may further include:
step 301: obtaining a terahertz image of a detected human body;
step 302: and determining whether the detected human body is suspected of hiding the suspected object based on the terahertz image.
Here, the suspicion may refer to contraband or dangerous goods.
In practical application, when a suspected substance is carried on a detected human body, the suspected substance can block terahertz radiation reflected or emitted by a corresponding part on the detected human body, so that a shadow can be formed on a terahertz image of the detected human body, and then the terahertz image of the detected human body can be used for judging whether the detected human body is suspected to hide the suspected substance.
For example, if the suspected object of the detected human body is judged, an early warning message can be sent to a security inspector so that the security inspector can process the suspected object or the detected human body. If the detected person is determined not to be suspected of hiding the suspected object, information for indicating passing of security inspection can be sent to the security inspector so that the security inspector can pass through the detected human body.
So far, the body temperature measurement process based on infrared and terahertz is completed.
As can be seen from the above, in the infrared and terahertz-based body temperature measuring method provided in the embodiment of the present application, first, the infrared brightness temperature of the first part of the measured human body is obtained; wherein the first part is a naked part; then, obtaining the terahertz brightness temperature of a first part of the detected human body and the terahertz brightness temperature of a second part of the detected human body; wherein the second portion is a different portion from the first portion; and finally, calibrating the terahertz brightness temperature of the second part according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part, and obtaining the body temperature of the detected human body. Therefore, the accurate body surface temperature of the detected human body under the clothes can be obtained. The body surface temperature of the measured human body under the clothes is not influenced by the external environment, so that the accurate body temperature of the measured human body is obtained. Thus, the accuracy of measuring the temperature of the human body is improved.
Based on the same invention concept, the embodiment of the application provides a body temperature measuring device based on infrared and terahertz. Fig. 4 is a schematic structural diagram of an infrared and terahertz-based body temperature measuring device in an embodiment of the present application, and referring to fig. 4, the body temperature measuring device 40 may include:
a first obtaining unit 401, configured to obtain an infrared brightness temperature of a first part of a detected human body; wherein the first part is a naked part;
a second acquiring unit 402, configured to acquire a terahertz brightness temperature of a first part of the human body to be detected and a terahertz brightness temperature of a second part of the human body to be detected; wherein the second portion is a different portion from the first portion;
the first obtaining unit 403 is configured to calibrate the terahertz brightness temperature at the second portion according to the infrared brightness temperature at the first portion and the terahertz brightness temperature at the first portion, and obtain the body temperature of the measured human body.
In this embodiment of the application, a first obtaining unit, configured to calibrate a terahertz brightness temperature at a second location according to an infrared brightness temperature at a first location and a terahertz brightness temperature at the first location, to obtain a body temperature of a measured human body, includes: the first obtaining unit is used for calculating the temperature of the first part of the detected human body according to the infrared brightness temperature of the first part; calculating a calibration parameter according to the terahertz brightness of the first part and the temperature of the first part by presetting a first function relation; the preset first functional relation is a functional relation between the terahertz brightness temperature and the temperature when attenuation of the terahertz by the clothes is not considered; obtaining the attenuation coefficient of clothes of a detected human body under a terahertz wave band; calculating the body temperature of the measured human body through presetting a second function relation based on the calibration parameters and the terahertz brightness and attenuation coefficient of the second part; the preset second function relationship is a function relationship between the terahertz brightness temperature and the temperature when the attenuation of the terahertz by the clothes is considered.
In an embodiment of the present application, a first obtaining unit, configured to obtain an attenuation coefficient of clothing of a human body under test in a terahertz waveband, includes: the device comprises a first obtaining unit, a second obtaining unit and a control unit, wherein the first obtaining unit is used for obtaining the terahertz brightness temperature of a first target part of a detected human body and the terahertz brightness temperature of a second target part of the detected human body; the first target part and the second target part are human body parts which are shielded by clothes; substituting the calibration parameters and the terahertz brightness temperature of the first target part into a preset second function relation to obtain a first equation; substituting the calibration parameters and the terahertz brightness temperature of the second target part into a preset second functional relation to obtain a second equation; subtracting the first equation from the second equation to obtain a third equation; substituting the preset human body temperature difference value into a third equation to calculate an attenuation coefficient; the human body temperature difference value refers to the difference value between the temperature of the first target part and the temperature of the second target part of the human body.
In an embodiment of the present application, the first obtaining unit, configured to calculate the temperature of the first portion of the detected human body according to the infrared brightness temperature of the first portion, includes: the first obtaining unit is used for dividing the infrared brightness temperature of the first part by the infrared emission coefficient to obtain the temperature of the first part of the detected human body; or calculating the temperature corresponding to the infrared brightness temperature of the first part according to a fitting curve which is generated in advance and used for representing the corresponding relation between the infrared brightness temperature and the temperature; the calculated temperature is determined as the temperature of the first portion.
In the embodiment of the application, the first part of the detected human body is the face of the detected human body; the second part of the human body to be measured is a trunk part of the human body to be measured, which is covered by clothes.
In other embodiments of the present application, the apparatus may further include: the second obtaining unit is used for obtaining a terahertz image of the detected human body; the first determining unit is used for determining whether the detected human body is suspected to hide a suspected object based on the terahertz image.
In other embodiments of the present application, the apparatus may further include: the second determining unit is used for determining whether the body temperature of the detected human body is greater than or equal to a preset temperature threshold value; and the output unit is used for outputting the early warning information if the body temperature of the detected human body is determined to be greater than or equal to the preset temperature threshold value.
Based on the same invention concept, the embodiment of the application provides security inspection equipment based on infrared and terahertz. Fig. 5 is a schematic structural diagram of a security inspection apparatus in an embodiment of the present application, and referring to fig. 5, the security inspection apparatus 50 may include: a terahertz-based detection device 501 and the infrared-and terahertz-based body temperature measurement devices 40 in one or more embodiments described above; wherein, detection device 501 includes: a third acquiring unit 5011, configured to acquire a terahertz image of a human body to be detected; the third determination unit 5012 is configured to determine whether the detected human body is suspected of hiding the suspected object based on the terahertz image.
As can be seen from the above, in the security inspection apparatus based on infrared and terahertz provided by the embodiment of the present application, on one hand, the surface temperature of the measured human body under the clothes can be obtained by calibrating the terahertz brightness temperature of the second part of the measured human body through the infrared brightness temperature of the first part of the measured human body and the terahertz brightness temperature of the first part of the measured human body. The body surface temperature of the measured human body under the clothes is not influenced by the external environment, so that the accurate body temperature of the measured human body is obtained. Thus, the accuracy of measuring the temperature of the human body is improved. On the other hand, whether the detected human body is suspected to hide a suspected object can be determined based on the terahertz image. Therefore, the infrared and terahertz-based security inspection equipment provided by the embodiment of the application is arranged in places such as airports, customs places, public places and the like, can identify suspected objects (namely dangerous objects or forbidden objects) hidden in clothes of a detected human body, can detect the body temperature of the detected human body, does not need a security inspector to hold an infrared body temperature measuring instrument (such as an infrared temperature detector, an infrared thermal imager and the like) to be in close contact with the detected human body, eliminates the risk that the security inspector is infected by diseases, realizes comprehensive and rapid security inspection, and improves the security inspection passing rate.
Based on the foregoing embodiments, the present application provides a security inspection apparatus. Fig. 6 is a schematic structural diagram of a security inspection apparatus in the embodiment of the present application, and referring to fig. 6, the security inspection apparatus may include: the system comprises a terahertz imaging module 601, an infrared imaging module 602 and a data processing module; wherein the content of the first and second substances,
the terahertz imaging module 601 is configured to inspect the human body 600 to be detected by using a terahertz imaging technology, and acquire terahertz imaging data (i.e., terahertz digital signals) of the human body 600 to be detected;
an infrared imaging module 602, configured to inspect the human body 600 to be detected by using an infrared imaging technology, and acquire infrared imaging data (i.e., infrared digital signals) of the human body 600 to be detected;
the data processing module is used for receiving terahertz imaging data transmitted by the terahertz imaging module and infrared imaging data transmitted by the infrared imaging module; processing terahertz imaging data transmitted by the terahertz imaging module and infrared imaging data transmitted by the infrared imaging module respectively to obtain a terahertz image and an infrared image of the detected human body 600 respectively; the terahertz image is also used for judging whether the detected human body 600 is suspected to hide suspected objects (such as dangerous objects or forbidden objects) based on the terahertz image of the detected human body 600; the terahertz image processing method is also used for selecting a first part of the detected human body 600 in two images, such as an infrared brightness temperature value T1 and a terahertz brightness temperature value T1 ' of the same point of the exposed face, and selecting a second part of the detected human body 600 in the terahertz image, such as a terahertz brightness temperature value T2 of another point of the human body trunk, based on the terahertz image and the infrared image of the detected human body 600, and then calibrating T2 through the relation between T1 and T1 ', so as to obtain an accurate terahertz brightness temperature value T2 '; based on the accurate terahertz brightness temperature value T2', a relatively accurate body temperature value of the detected human body 600 is obtained. Therefore, the accurate body temperature value of the detected human body is obtained, and the detected person with abnormal body temperature is identified and monitored.
In addition, the data processing module is also used for judging the suspected object of the detected human body according to the terahertz image. If the detected human body is judged to be suspected of hiding the suspected object, a security inspector is requested to process the detected person; if the detected human body is judged not to be suspected of hiding the suspected object, the detected person is released.
In practical application, the terahertz imaging module can obtain a terahertz image of the body of the detected person, so that the data processing module can be used for judging whether the body of the detected person carries a suspect or not according to the terahertz image. Specifically, when the person to be detected carries a suspected substance, the suspected substance blocks terahertz radiation reflected or emitted by a corresponding part on the person to be detected, so that a shadow is formed on a terahertz image of the person to be detected, and the fact that the corresponding part on the person to be detected carries the suspected substance is further judged.
In the embodiment of the present application, still referring to fig. 6, the terahertz imaging module 601 may include: the terahertz detection device comprises a terahertz acquisition device 6011, a terahertz focusing device 6012, a terahertz detector 6013, a terahertz data acquisition device and a terahertz controller. The terahertz acquisition device 6011 is configured to acquire terahertz radiation emitted by a human body 600 to be detected, and focus the terahertz radiation onto the terahertz detector 6013 by using an optical focusing manner through the terahertz focusing device 6012. The terahertz detector 6013 is configured to receive terahertz radiation and convert the terahertz radiation into a terahertz analog signal; outputting the terahertz analog signal to a terahertz data acquisition unit; the terahertz data acquisition unit is used for receiving a terahertz analog signal output by the terahertz detector 6013; and performing signal and data processing on the received analog signal to obtain a terahertz digital signal serving as terahertz imaging data. In addition, the terahertz controller is configured to receive a control command of the data processing module to control operations of the terahertz acquisition device 6011, the terahertz focusing device 6012, the terahertz detector 6013, and the terahertz data acquisition device, such as scanning the human body 600, acquiring a signal, and processing corresponding data and signals to obtain terahertz imaging data of the human body 600.
In an embodiment of the present application, still referring to fig. 6, infrared imaging module 602 may include: the device comprises an infrared acquisition device 6021, an infrared detector 6022, a black body calibration device 6023, an infrared data acquisition unit and an infrared controller. The infrared acquisition device 6021 is configured to acquire infrared radiation emitted by the human body 600 to be detected and focus the infrared radiation onto the infrared detector 6022. The infrared detector 6022 is used for receiving the infrared radiation collected by the infrared collection device 6021 and converting the infrared radiation into an infrared analog signal; and outputting the infrared analog signal to an infrared data acquisition unit. The infrared data acquisition unit is used for processing the infrared analog signals generated by the infrared detector 6022 to form infrared digital signals serving as infrared imaging data; and transmitting the infrared digital signal to a data processing module for image processing. The infrared controller receives the control command of the data processing module to control the operations of the infrared acquisition device 6021, the infrared detector 6022 and the infrared data acquisition device, such as scanning the measured human body 600, acquiring signals and processing corresponding data and signals to obtain infrared imaging data. The black body calibration device 6023 is used for calibrating the infrared imaging module 602 in real time according to the environmental temperature of the security inspection place.
In practical application, the infrared imaging module may be an active type, and at this time, the infrared imaging module may further include an infrared radiation source for emitting infrared radiation emitted by irradiating a human body to be detected; or the infrared imaging module can be passive, and the infrared imaging module collects infrared radiation emitted by a detected human body to generate infrared imaging data.
In practical applications, the movement mode of the infrared acquisition device may include rotation, swing, linear movement, standing still, and the like.
Still referring to fig. 6, infrared imaging module 602 may be integrated on or in terahertz imaging module 601 such that they may share a common physical link, such as a link for communicating relevant data and signals, etc.
It should be noted here that although fig. 6 shows that the terahertz imaging module 601 and the infrared imaging module 200 respectively have their own data collector and controller, in another embodiment of the present invention, they may be arranged to share one data collector and controller, so that they may share more physical links and may be processed via the same data processing module.
In an alternative embodiment, the infrared imaging module may be integrated inside or on the terahertz imaging module, so that the image acquisition of the infrared imaging module, the image acquisition of the terahertz imaging module, and the acquisition of the video image (if the security inspection apparatus is provided with a corresponding video camera or a camera) share a physical link for data transmission, and finally, all data may share one data processing module (for example, one computer) for data processing and display, so that the security inspection apparatus has a simple layout and is integrated.
Further, still referring to fig. 6, the security inspection apparatus may be configured with a video camera 603 to capture video images of the detected human body 600, and at the same time, count the detected human body 600. The human body video image formed by the video camera 603 is used for locking a specific person carrying a suspected object and is fused with the terahertz image and the infrared image, so that comparison and identification are facilitated.
In this embodiment of the application, still referring to fig. 6, the video camera 603 may be disposed on the window 604 of the security inspection apparatus and a horizontal optical axis of the terahertz optical path of the security inspection apparatus, so as to ensure that the size ratio of the acquired human body video image to the terahertz image is equal.
In the embodiment of the present application, still referring to fig. 6, the video camera 603 and the infrared capturing device 6021 ensure that the captured video image and the infrared image are in equal size proportion by the black body calibration device 6023. The three images form relevant consistency, and the temperature positions acquired by each image are ensured to be consistent, so that the accurate body temperature value of the measured human body 600 can be obtained through algorithm calculation.
Additionally, the security inspection equipment can be also provided with a depth measurement camera for collecting distance information of the human body, so that the distance information of the detected human body and the human body security inspection equipment is collected, and the position of the detected human body is accurately identified.
Further, when a detected human body carrying a suspected substance is found, the security inspection equipment can perform alarm identification, sound-light alarm and the like on the terahertz image and the video image.
In one example, the data processing module may be implemented as a PC computer or as an embedded processing unit.
It can be known from the above content that the security check equipment provided by the embodiment of the application is the human body security check imaging equipment capable of synchronously measuring the body temperature, and the human body security check imaging equipment utilizes the terahertz imaging technology and the infrared imaging technology to perform human body security check, so that the security check function of the equipment is increased. Firstly, terahertz imaging is not affected by body clothes and the like of a detected person to carry out real-time dynamic quick detection, and secondly, the problem of inaccurate body temperature measurement caused by the influence of an external environment on infrared body temperature measurement is solved by the technology of combining terahertz imaging and infrared imaging. Therefore, the security inspection equipment provided by the embodiment of the application has the advantages that terahertz imaging is not affected by body clothes and the like of the detected person, and accurate body temperature measurement can be achieved based on the combination of terahertz imaging and infrared imaging, and the security inspection equipment is suitable for security inspection and body temperature measurement in public places with many persons, high person flowing speed and the like.
Based on the same inventive concept, the embodiment of the application provides electronic equipment. Fig. 7 is a schematic structural diagram of an electronic device in an embodiment of the present application, and referring to fig. 7, the electronic device 70 includes: at least one processor 701; and at least one memory 702, bus 703 connected to processor 701; the processor 701 and the memory 702 complete mutual communication through a bus 703; the processor 701 is configured to invoke program instructions in the memory 702 to perform the steps of the infrared and terahertz based body temperature measurement methods in one or more of the embodiments described above.
The Processor may be implemented by a Central Processing Unit (CPU), a microprocessor Unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like. The Memory may include volatile Memory in a computer readable medium, Random Access Memory (RAM), and/or nonvolatile Memory such as Read Only Memory (ROM) or Flash Memory (Flash RAM), and the Memory includes at least one Memory chip.
It should be noted that, in the embodiments of the present application, if the infrared and terahertz-based body temperature measurement method in one or more of the above embodiments is implemented in the form of a software functional module and sold or used as a separate product, it may also be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or portions thereof that contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling an electronic device (which may be a personal computer, a server, or a network device) to execute all or part of the methods of the embodiments of the present application.
Accordingly, based on the same inventive concept, embodiments of the present application further provide a computer-readable storage medium, where the computer-readable storage medium includes a stored program, where the program, when executed, controls an electronic device in which the storage medium is located to perform the steps of the infrared and terahertz-based body temperature measurement method in one or more embodiments.
Here, it should be noted that: the above description of the apparatus, security check device, electronic device, or computer-readable storage medium embodiments is similar to the description of the method embodiments described above, with similar beneficial effects as the method embodiments. For technical details not disclosed in the embodiments of the apparatus, the security check device, the electronic device or the computer-readable storage medium of the present application, reference is made to the description of the embodiments of the method of the present application for understanding.
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

Claims (6)

1. An infrared and terahertz based body temperature measurement device, comprising:
the first acquisition unit is used for acquiring the infrared brightness temperature of a first part of a detected human body; wherein the first part is a naked part;
the second acquisition unit is used for acquiring the terahertz brightness temperature of the first part of the measured human body and the terahertz brightness temperature of the second part of the measured human body; wherein the second location is a different location than the first location;
the first obtaining unit is used for calibrating the terahertz brightness temperature of the second part according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part to obtain the body temperature of the detected human body, and comprises: calculating the temperature of the first part of the detected human body according to the infrared brightness temperature of the first part;
calculating a calibration parameter according to the terahertz brightness of the first part and the temperature of the first part through presetting a first function relation; the preset first functional relation is a functional relation between the terahertz brightness temperature and the temperature when attenuation of the terahertz by the clothes is not considered;
obtaining the attenuation coefficient of clothes of a detected human body under a terahertz wave band;
calculating the body temperature of the measured human body through presetting a second function relation based on the calibration parameters, the terahertz brightness of the second part and the attenuation coefficient; the preset second function relationship is a function relationship between the terahertz brightness temperature and the temperature when the attenuation of the terahertz by the clothes is considered.
2. The infrared and terahertz-based body temperature measurement device according to claim 1, wherein the obtaining of the attenuation coefficient of the measured body clothes in the terahertz waveband comprises:
acquiring the terahertz brightness temperature of a first target part of the detected human body and the terahertz brightness temperature of a second target part of the detected human body; the first target part and the second target part are human body parts which are covered by clothes;
substituting the calibration parameter and the terahertz brightness temperature of the first target part into the preset second function relation to obtain a first equation;
substituting the calibration parameter and the terahertz brightness temperature of the second target part into the preset second functional relation to obtain a second equation;
subtracting the first equation from the second equation to obtain a third equation;
substituting a preset human body temperature difference value into the third equation to calculate the attenuation coefficient; the human body temperature difference value refers to the difference value between the temperature of the first target part and the temperature of the second target part of the human body.
3. The infrared and terahertz-based body temperature measuring device according to claim 2, wherein calculating the temperature of the first part of the measured human body according to the infrared brightness temperature of the first part comprises:
dividing the infrared bright temperature of the first part by an infrared emission coefficient to obtain the temperature of the first part of the detected human body;
or calculating the temperature corresponding to the infrared brightness temperature of the first part according to a fitting curve which is generated in advance and used for representing the corresponding relation between the infrared brightness temperature and the temperature; and determining the calculated temperature as the temperature of the first part.
4. The infrared and terahertz-based body temperature measurement device of claim 1, wherein the first part of the human subject is a face of the human subject;
the second part of the human body to be measured is a trunk part of the human body to be measured, which is covered by clothes.
5. The infrared and terahertz-based body temperature measurement device according to claim 4, wherein the device determines whether the body temperature of the human subject is greater than or equal to a preset temperature threshold after the body temperature of the human subject is obtained;
and if the body temperature of the detected human body is determined to be greater than or equal to the preset temperature threshold value, outputting early warning information.
6. The utility model provides a security check equipment based on infrared and terahertz, its characterized in that, security check equipment includes: a terahertz-based detection device and the infrared and terahertz-based body temperature measurement device of claim 1;
wherein the detection device comprises: the third acquisition unit is used for acquiring a terahertz image of the detected human body; and the third determining unit is used for determining whether the detected human body is suspected to hide a suspected object or not based on the terahertz image.
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