CN111297336B - A body temperature measurement method, device and security inspection equipment based on infrared and terahertz - Google Patents

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

A body temperature measurement method, device and security inspection equipment based on infrared and terahertz

technical field

The present application relates to the field of testing, and in particular, to an infrared and terahertz-based body temperature measurement method, device, and security inspection equipment.

Background technique

At present, in public places, border ports, airports, customs and other body temperature quarantine areas, in order to identify whether the temperature of the people in the body temperature quarantine area is normal, the security personnel usually hold an infrared temperature detector or use an infrared thermal imager. Personnel taking temperature measurements.

In practical applications, the infrared body temperature measurement method can only measure the temperature of the exposed skin of the human body, which is greatly affected by the external environment such as air temperature and airflow, thus reducing the accuracy of the measurement of the real temperature of the human body (also referred to as human body temperature or body temperature). Spend.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present application provide a body temperature measurement method, device and security inspection device based on infrared and terahertz, which can improve the measurement accuracy of the real temperature of the human body.

The embodiments of the present application mainly provide the following technical solutions:

In a first aspect, an embodiment of the present application provides a method for measuring body temperature based on infrared and terahertz, the method comprising: acquiring the infrared brightness temperature of a first part of the human body to be measured; wherein the first part is bare part; obtain the terahertz brightness temperature of the first part of the human body to be tested and the terahertz brightness temperature of the second part of the human body to be tested; wherein, the second part is different from the first part part; according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part, the terahertz brightness temperature of the second part is calibrated to obtain the body temperature of the measured human body.

In a second aspect, an embodiment of the present application provides a body temperature measurement device based on infrared and terahertz, the device includes: a first acquisition unit for acquiring the infrared brightness temperature of the first part of the human body to be measured; wherein, the The first part is a bare part; the second acquisition unit is used to acquire the terahertz brightness temperature of the first part of the human body to be measured and the terahertz brightness temperature of the second part of the human body to be measured; wherein, the The second part is a different part from the first part; the first obtaining unit is used for obtaining the second part according to the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part The terahertz brightness temperature is calibrated to obtain the body temperature of the measured body.

In a third aspect, an embodiment of the present application provides an infrared and terahertz-based security inspection device, the security inspection device includes: a terahertz-based detection device and the above infrared and terahertz-based body temperature measurement device; wherein, the The detection device includes: a third acquisition unit for acquiring a terahertz image of the human body under test; and a third determination unit for determining whether the human body under test is suspected of hiding a suspect based on the terahertz image.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, the storage medium includes a stored program, wherein, when the program runs, the electronic device where the storage medium is located is controlled to execute the above infrared and solar-based Steps of the Hertzian Body Temperature Measurement Method.

In a fifth aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: at least one processor; and at least one memory and a bus connected to the processor; wherein the processor and the memory pass through all the The bus completes mutual communication; the processor is used to call the program instructions in the memory to execute the steps of the above-mentioned infrared and terahertz-based body temperature measurement method.

The infrared and terahertz-based body temperature measurement methods, devices, and security inspection equipment provided by the embodiments of the present application can detect the infrared brightness temperature of the first part of the human body to be measured and the terahertz brightness temperature of the first part of the human body to be measured. The terahertz brightness temperature of the second part is calibrated, wherein, the first part is a bare part, and the second part is a different part from the first part, so that an accurate body temperature can be obtained. Thus, the measurement accuracy of the human body temperature is improved.

Other features and advantages of the present application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present application. Other advantages of the present application may be realized and attained by the approaches described in the specification and drawings.

Description of drawings

The accompanying drawings are used to provide an understanding of the technical solutions of the present application, and constitute a part of the specification. They are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

1 is a schematic flowchart 1 of a body temperature measurement method based on infrared and terahertz in an embodiment of the application;

Fig. 2 is the second schematic flow chart of the body temperature measurement method based on infrared and terahertz in the embodiment of the application;

3 is a schematic flowchart three of the infrared and terahertz-based body temperature measurement method in the embodiment of the application;

4 is a schematic structural diagram of a body temperature measurement device based on infrared and terahertz in an embodiment of the application;

5 is a schematic structural diagram 1 of a security inspection device in an embodiment of the present application;

FIG. 6 is a second schematic structural diagram of the security inspection device in the embodiment of the application;

FIG. 7 is a schematic structural diagram of an electronic device in an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

The embodiments of the present application provide a body temperature measurement method based on infrared and terahertz. In practical applications, the infrared and terahertz-based body temperature measurement method can be applied to various occasions that need to measure human body temperature in crowded public places, border ports, airports, customs and other body temperature quarantine areas.

In the embodiments of the present application, the brightness temperature may be referred to as "brightness temperature" for short. Specifically, at the same wavelength, if the spectral radiation intensity of an actual object and a black body (a hypothetical standard object used for thermal radiation research that does not depend on specific physical properties) is equal, then the temperature of the black body at this time is called the actual object at this wavelength. lower brightness temperature.

FIG. 1 is a schematic flow chart 1 of a method for measuring body temperature based on infrared and terahertz in an embodiment of the present application. Referring to FIG. 1 , the method for measuring body temperature based on infrared and terahertz may include:

Step 101: Acquire the infrared brightness temperature of the first part of the human body to be measured.

Among them, the first part of the human body to be tested is a bare 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 above step S101 may include: obtaining an infrared image of the human body to be measured; performing image processing on the infrared image to determine a target infrared image area where the first part of the human body to be measured is located; from the target infrared image area, Determine the infrared brightness temperature of the first part of the human body to be measured.

In the specific implementation process, according to the target infrared image area where the first part of the measured human body is located in the infrared image of the measured human body, the implementation of determining the infrared brightness temperature of the first part of the measured human body may exist but is not limited to include the following Four ways:

In an exemplary embodiment, the average value of the pixel values of all the pixel points in the target infrared image area may be determined as the infrared brightness temperature of the first part of the human body to be measured.

In an exemplary embodiment, the maximum pixel value among 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 part of the human body to be measured.

In an exemplary embodiment, the pixel value of a certain pixel in the target infrared image area may be determined as the infrared brightness temperature of the first part of the human body to be measured.

In an exemplary embodiment, the pixel value of any pixel in the target infrared image area may be determined as the infrared brightness temperature of the first part of the human body to be measured.

Certainly, in addition to the above-mentioned four manners, there may also be other implementation manners, which are not specifically limited in the embodiments of the present application.

In practical applications, when the infrared and terahertz-based body temperature measurement methods provided by the embodiments of the present application are applied to security inspection equipment, an infrared image of the human body to be measured can be obtained through an infrared imaging device in the security inspection equipment. For example, the infrared imaging device can collect the infrared radiation emitted by the human body under test; convert the infrared radiation of the human body under test into the analog signal of the human body under test in the infrared band; process the analog signal of the human body under test in the infrared band , obtain the digital signal of the human body under test in the infrared band; process the digital signal of the human body under test in the infrared band to obtain the imaging image of the human body under test in the infrared band. In this way, the infrared image of the tested human body is obtained.

Step 102: Acquire the terahertz brightness temperature of the first part of the human body to be measured and the terahertz brightness temperature of the second part of the human body to be measured.

Among them, the second part is a different part from the first part.

Here, the terahertz brightness temperature of the first part refers to the brightness temperature of the first part of the human body to be measured in the terahertz band, and the terahertz brightness temperature of the second part refers to the terahertz brightness temperature of the second part of the human body to be measured in the terahertz band brightness temperature.

In other implementations of the present application, the above step S102 may include: obtaining a terahertz image of the human body to be measured; performing image processing on the terahertz image to determine the first target terahertz image area where the first part of the human body to be measured is located and the measured The second target terahertz image area where the second part of the human body is located; from the first target terahertz image area, determine the terahertz brightness temperature of the first part; from the second target terahertz image area, determine the terahertz brightness temperature of the second part Terahertz brightness temperature.

Similar to the implementation of determining the infrared brightness temperature of the first part of the human body to be measured, in the specific implementation process, according to the terahertz image of the human body to be measured, the first target terahertz image area and The second target terahertz image area where the second part of the human body is located, the terahertz brightness temperature of the first part of the human body to be measured is determined, and the realization method of determining the terahertz brightness temperature of the second part of the human body can be achieved. There are but are not limited to include the following four ways:

In an exemplary embodiment, the average value of the pixel values of all pixel points in the first target terahertz image area may be determined as the terahertz brightness temperature of the first part of the human body to be measured. Similarly, the average value of the pixel values of all the pixel points in the second target terahertz image area can be determined as the terahertz brightness temperature of the second part of the human body to be measured.

In an exemplary embodiment, the largest pixel value among all pixel values corresponding to all pixel points in the first target terahertz image area may be determined as the terahertz brightness temperature of the first part of the human body to be measured. Similarly, the largest pixel value among all pixel values corresponding to all pixel points in the second target terahertz image area may be determined as the terahertz brightness temperature of the second part of the human body under test.

In an exemplary embodiment, the pixel value of a certain pixel in the first target terahertz image area may be determined as the terahertz brightness temperature of the first part of the human body to be measured. Similarly, the pixel value of a specific pixel in the second target terahertz image area can be determined as the terahertz brightness temperature of the second part of the human body to be measured.

In an exemplary embodiment, the pixel value of any pixel in the first target terahertz image area may be determined as the terahertz brightness temperature of the first part of the human body to be measured. Similarly, in an exemplary embodiment, the pixel value of any pixel in the second target terahertz image area may be determined as the terahertz brightness temperature of the second part of the human body under test.

It should be noted that the same determination method should be used for the terahertz brightness temperature of the first part and the infrared brightness temperature of the first part. For example, if the method of selecting any point is adopted, then the brightness temperature of the same point is selected for the terahertz brightness temperature of the first part and the infrared brightness temperature of the first part.

Certainly, in addition to the above-mentioned four manners, there may also be other implementation manners, which are not specifically limited in the embodiments of the present application.

In practical applications, when the infrared and terahertz-based body temperature measurement methods provided in the embodiments of the present application are applied to security inspection equipment, a terahertz image of the human body under test can be obtained through a terahertz imaging device in the security inspection equipment. For example, the terahertz imaging device can collect the terahertz radiation emitted by the human body under test; convert the terahertz radiation of the human body under test into an analog signal of the human body under test in the THz band; The analog signal of the tested human body is processed to obtain the digital signal of the tested human body in the terahertz band; the digital signal of the tested human body in the terahertz band is processed to obtain the image of the tested human body in the terahertz band. In this way, a terahertz image of the human body under test is obtained.

Step 103 : calibrate 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 human body to be measured.

In this way, on the one hand, since infrared cannot penetrate the clothes of the tested human body, only the exposed part of the tested human body can be measured in the infrared band, but the temperature of the exposed part is easily affected by the external environment. Terahertz can penetrate the clothes of the tested human body, and can measure the brightness temperature of the body surface itself in the terahertz band under the clothes of the tested human body; on the other hand, combining infrared imaging with terahertz imaging, through the first The infrared brightness temperature of one part is the terahertz brightness temperature of the first part, and the terahertz brightness temperature of the second part is calibrated to obtain the body temperature of the measured human body. Thus, the measurement accuracy of the human body temperature can be improved.

In an exemplary embodiment, step 103 may include the following steps 1031 to 1034:

Step 1031: Calculate the temperature of the first part of the human body to be measured according to the infrared brightness temperature of the first part.

In the specific implementation process, step 1031 may exist but is not limited to include the following two implementations:

In an exemplary embodiment, step 1031 may include: dividing the infrared brightness temperature of the first part of the human body to be measured by a pre-stored infrared emission coefficient to obtain the temperature of the first part of the human body to be measured.

In practical applications, all media (such as gases, solids, liquids, etc.) radiate electromagnetic energy outward. The infrared emission coefficient can be used to represent the target medium, such as the intensity of infrared radiation emitted by the measured human body in the infrared band. Therefore, the infrared brightness temperature of the measured person (that is, the brightness temperature of the measured human body in the infrared band) can be represented by the product of the measured human body temperature and the infrared emission coefficient, that is, the following formula (1).

表示红外发射系数。Among them, T ₁ represents the temperature of the first part of the human body to be measured; T _s represents the infrared brightness temperature of the first part of the human body to be measured;

Indicates the infrared emission coefficient.

由本领域技术人员根据实验测定。In practical applications,

It is determined experimentally by those skilled in the art.

通过上述公式(1)，给被测人体的第一部位的红外亮温T_s除以预先存储的红外发射系数

来得到被测人体的第一部位的温度T₁。Then, after obtaining the infrared brightness temperature T _s of the first part of the human body to be measured, the known infrared emission coefficient can be

According to the above formula (1), divide the infrared brightness temperature T _s of the first part of the human body by the pre-stored infrared emission coefficient

to obtain the temperature T ₁ of the first part of the human body to be measured.

In another exemplary embodiment, step 1031 may include: calculating a temperature corresponding to the infrared brightness temperature of the first part according to a pre-generated fitting curve representing the correspondence between the infrared brightness temperature and the temperature; The calculated temperature is determined as the temperature of the first site.

In practical applications, considering the low cost of the blackbody calibration source used for calibrating infrared imaging devices (such as infrared sensors), multiple infrared brightness temperatures and their corresponding infrared brightness temperatures can be measured in advance through infrared blackbody calibration. Multiple temperatures, wherein the multiple infrared brightness temperatures correspond to the multiple temperatures one-to-one; then, curve fitting is performed on the multiple infrared brightness temperatures and the multiple temperatures to generate a graph representing the difference between the infrared brightness temperature and the temperature The fitted curve of the corresponding relationship. Next, after obtaining the infrared brightness temperature of the first part of the human body to be measured, the fitting curve can be used to calculate the temperature corresponding to the infrared brightness temperature of the first part of the human body to be measured, and then the calculated The temperature is determined as the temperature of the first part.

For example, the above curve fitting method may be, for example, least squares fitting.

Of course, in addition to the two methods listed above, other predetermined arithmetic formulas can also be used to calculate the temperature of the first part of the human body to be measured according to the infrared brightness temperature of the first part of the human body to be measured. Here, the embodiment of the present application No specific limitation is made.

Step 1032: Calculate the calibration parameter by presetting the first functional relationship according to the terahertz brightness temperature of the first part and the temperature of the first part.

Wherein, the preset first functional relationship is the functional relationship between the terahertz brightness temperature and the temperature when the attenuation of the terahertz by the clothes is not considered. Here, the functional relationship between THz brightness temperature and temperature refers to the corresponding relationship between THz brightness temperature and temperature.

In an exemplary embodiment, a preset first functional relationship as shown in formula (2) may be set to represent the corresponding relationship between the terahertz brightness temperature and the temperature of the exposed part of the human body that is not covered by clothing.

表示太赫兹发射系数，C表示校准参数。Wherein, T ₁ represents the temperature of the first part of the human body to be measured; T _b1 represents the terahertz brightness temperature of the first part of the human body to be measured; λ ₂ is the wavelength of terahertz;

represents the terahertz emission coefficient, and C represents the calibration parameter.

由本领域技术人员根据实验测定。In practical applications,

It is determined experimentally by those skilled in the art.

太赫兹的波长λ₂为已知的，那么，在获得了被测人体的第一部位的太赫兹亮温T_b1和该第一部位的温度T₁之后，将第一部位的太赫兹亮温T_b1、该第一部位的温度T₁、太赫兹发射系数

太赫兹的波长λ₂代入公式(2)中，就可以计算出所需的校准参数C。Due to the terahertz emission coefficient

The wavelength λ ₂ of the terahertz is known, then, after obtaining the terahertz brightness temperature T _b1 of the first part of the human body and the temperature T ₁ of the first part, the terahertz brightness temperature of the first part is obtained. T _b1 , temperature T ₁ of the first part, terahertz emission coefficient

By substituting the terahertz wavelength λ ₂ into formula (2), the required calibration parameter C can be calculated.

这里，本申请实施例不做具体限定。Of course, other formulas can also be used to express the preset first functional relationship, such as

Here, the embodiments of the present application do not make specific limitations.

Step 1033: Obtain the attenuation coefficient of the clothing of the tested human body in the terahertz band.

Since terahertz is emitted from the human body, terahertz will attenuate when it penetrates clothing. Therefore, in order to obtain a more accurate body temperature of the measured human body, it is necessary to obtain the attenuation coefficient of the clothing of the measured human body in the terahertz band.

Step 1034: Based on the calibration parameters, the terahertz brightness temperature and the attenuation coefficient of the second part, and by presetting the second functional relationship, calculate the body temperature of the human body to be measured.

The preset second functional relationship is a functional relationship between the terahertz brightness temperature and the temperature when the attenuation of the terahertz by the clothes is considered.

In practical applications, there is more than one functional relationship between terahertz brightness temperature and temperature. When the human body emits terahertz, the terahertz will attenuate when it penetrates clothing. Therefore, when it is necessary to calculate the temperature of the second part covered by clothing, the preset second as shown in the following formula (3) can be set. Functional relationship.

表示太赫兹发射系数，C表示校准参数，μ表示被测人体的衣物在太赫兹波段下的衰减系数。Wherein, T ₂ represents the temperature of the second part of the human body to be tested; T _b2 represents the terahertz brightness temperature of the second part of the human body to be tested; λ ₂ is the wavelength of terahertz;

represents the terahertz emission coefficient, C represents the calibration parameter, and μ represents the attenuation coefficient of the clothing of the tested human body in the terahertz band.

由本领域技术人员根据实验测定。In practical applications,

It is determined experimentally by those skilled in the art.

太赫兹的波长λ₂为已知的，那么，在获得了校准参数C、第二部位的太赫兹亮温T_b2和衰减系数μ之后，将校准参数C、第二部位的太赫兹亮温T_b2、衰减系数μ、太赫兹发射系数

和太赫兹的波长λ₂代入公式(3)中，就可以计算出所需的被测人体的第二部位的温度T₂。然后，将该被测人体的第二部位的温度T₂作为所需的被测人体的体温，就得到了更为精准的人体温度。如此，一方面，由于红外不能穿透被测人体的衣服，只能测量到被测人体的表面在红外波段下的亮温，而太赫兹能够穿透被测人体的衣服，可以测量到被测人体的衣服下的体表本身在太赫兹波段下的亮温；另一方面，将红外成像与太赫兹成像相结合，通过第一部位的红外亮温计算出对应的第一部位的温度，再通过该第一部位的温度和第一部位的太赫兹亮温计算出校准参数来对第二部位的太赫兹亮温进行校准，得到的被测人体的体温，能够提高人体温度的测量准确度。Due to the terahertz emission coefficient

The wavelength λ ₂ of the terahertz is known, then, after the calibration parameter C, the terahertz brightness temperature T _b2 of the second part and the attenuation coefficient μ are obtained, the calibration parameter C, the terahertz brightness temperature T of the second part are obtained. _b2 , attenuation coefficient μ, terahertz emission coefficient

and the wavelength λ ₂ of the terahertz are substituted into formula (3), and the required temperature T ₂ of the second part of the human body to be measured can be calculated. Then, the temperature T2 of the _second part of the human body to be measured is taken as the required body temperature of the human body to be measured, so that a more accurate human body temperature is obtained. In this way, on the one hand, since infrared cannot penetrate the clothes of the human body under test, only the brightness temperature of the surface of the human body under test in the infrared band can be measured, while terahertz can penetrate the clothes of the human body under test and can measure the temperature of the human body under test. The brightness temperature of the body surface under the clothes of the human body in the terahertz band; on the other hand, the infrared imaging and the terahertz imaging are combined to calculate the temperature of the corresponding first part through the infrared brightness temperature of the first part, and then The temperature of the first part and the terahertz brightness temperature of the first part are used to calculate calibration parameters to calibrate the terahertz brightness temperature of the second part, and the obtained body temperature can improve the measurement accuracy of the human body temperature.

Of course, other formulas can also be used to represent the preset second functional relationship, such as obtaining the preset second functional relationship according to the preset first functional relationship and the attenuation coefficient through other empirical formulas. Here, the embodiments of the present application do not make specific limitations.

The following describes how to obtain the attenuation coefficient.

In the specific implementation process, step 1033 can exist but is not limited to include the following three implementations:

In an exemplary embodiment, step 1033 may include: acquiring the terahertz brightness temperature of the first target part of the human body to be measured and the terahertz brightness temperature of the second target part of the human body to be measured; The two target parts are all parts of the human body covered by clothing; the calibration parameters and the terahertz brightness temperature of the first target part are substituted into the preset second functional relationship to obtain the first equation; the calibration parameters and the terahertz brightness temperature of the second target part are Substitute the brightness temperature into the preset second functional relationship to obtain the second equation; subtract the first equation from the second equation to obtain the third equation; substitute the preset human body temperature difference into the third equation, The attenuation coefficient is calculated; wherein, the human body temperature difference refers to the difference between the temperature of the first target part of the human body and the temperature of the second target part.

In an exemplary embodiment, the first target site may be, for example, the chest or the like. The second target site may be, for example, the abdomen.

Exemplarily, assuming that the first target part is the chest and the second target part is the abdomen, in order to more accurately determine the required attenuation coefficient in real time, the terahertz brightness temperature of the measured human chest and the measured human chest can be calculated. The relationship between the temperature, the relationship between the measured terahertz brightness temperature of the abdomen of the human body and the temperature of the measured human abdomen, and the temperature difference between the human chest and the abdomen are used to calculate the attenuation coefficient in real time.

For example, when the temperature difference of the human body is known, the calibration parameter and the terahertz brightness temperature of the first target site are substituted into the preset second functional relationship shown in formula (2), and the formula (4) can be obtained. ) shown in the first equation; next, the calibration parameters and the terahertz brightness temperature of the second target site are substituted into the preset second functional relationship shown in formula (2), and can be obtained as shown in formula (5) The second equation of equation; finally, the required attenuation coefficient can be calculated by substituting the known human body temperature difference into the third equation shown in equation (6).

表示太赫兹发射系数，C表示校准参数，μ表示被测人体的衣物在太赫兹波段下的衰减系数。Wherein, T ₂ ′ represents the temperature of the first target part of the human body to be measured; T ₂ ″ represents the temperature of the second target part of the human body to be measured; T _b2 ′ represents the terahertz brightness temperature of the first target part of the human body to be measured; T _b2 ″ represents the terahertz brightness temperature of the second target part of the tested human body; λ ₂ is the wavelength of terahertz;

represents the terahertz emission coefficient, C represents the calibration parameter, and μ represents the attenuation coefficient of the clothing of the tested human body in the terahertz band.

It should be understood that, for the method of determining the terahertz brightness temperature of the first target part of the human body to be tested, the terahertz brightness temperature of the second target part of the human body to be tested can be determined by referring to the above-mentioned about obtaining the terahertz brightness temperature of the first part of the human body to be tested. The determination method of the brightness temperature and the terahertz brightness temperature of the second part of the human body to be measured is understood.

In an exemplary embodiment, step 1033 may include: acquiring a visible light image of the clothing of the tested person; matching a fabric image matching the visible light image of the clothing of the tested person in a pre-stored fabric image database; The mapping relationship between the image and the attenuation coefficient is obtained, and the attenuation coefficient corresponding to the matched fabric image is obtained as the attenuation coefficient of the clothing of the tested human body in the terahertz band.

In practical applications, considering that the attenuation coefficients of clothing made of different fabrics are different in the terahertz band, the fabric image of the clothing of the tested human body is matched by matching the visible light image of the clothing of the tested human body. The attenuation coefficient corresponding to the fabric is used as the attenuation coefficient of the clothing of the tested human body in the terahertz band. In this way, an accurate attenuation coefficient can be obtained.

In an exemplary embodiment, step 1033 may include: reading a pre-stored preset attenuation coefficient from the local memory; and using the preset attenuation coefficient as the attenuation coefficient of the clothing of the human body under test in the terahertz band.

In practical applications, the preset attenuation coefficient may be an empirical value set in advance by those skilled in the art according to experiments.

Of course, in addition to the three methods listed above, other methods may also be used to obtain the attenuation coefficient of the clothing of the human body under test in the terahertz band, which is not specifically limited in the embodiments of the present application.

In an exemplary embodiment of the present application, the first part of the human body to be measured is the face of the human body to be measured, such as the forehead; chest etc.

In practical applications, since the face of the human body to be tested is often exposed, and the trunk of the human body to be tested is often covered under clothing, the first part of the human body to be tested can be selected as the face of the human body to be tested, such as The forehead, the sides of the forehead, etc., and the second part of the human body to be tested is selected as the trunk part covered by clothing, such as the chest, back, etc. The brightness temperature is the terahertz wave brightness temperature of the first part of the human body to be tested, and the terahertz wave brightness temperature of the second part of the human body to be measured is calibrated to obtain the body surface temperature of the human body to be measured under the clothes. However, the temperature of the body surface of the tested human body under the clothes will not be affected by the external environment, therefore, an accurate body temperature of the tested human body is obtained. Thus, the measurement accuracy of the human body temperature is improved.

In another exemplary embodiment of the present application, the first part of the human body to be measured is the exposed part of the face of the human body to be measured, such as the forehead; the second part of the human body to be measured is the part of the human body to be measured that is covered by clothing The face, such as the cheeks covered by the mask being worn, etc.

In other embodiments of the present application, as shown in FIG. 2 , after the foregoing step 103, the foregoing method may further include:

Step 201: determine whether the body temperature of the measured human body is greater than or equal to a preset temperature threshold;

Step 202: If it is determined that the body temperature of the measured human body is greater than or equal to a preset temperature threshold, output warning information.

Here, the warning information is used to warn the measured human body with abnormal temperature.

In practical applications, the above step of outputting early warning information may include one or more of the following: playing a preset alarm audio, displaying a preset light effect, and sending an early warning notification message to a mobile terminal held by a security inspector.

In practical applications, the infrared and terahertz images of the human body to be measured are used to select the infrared brightness temperature of the first part of the human body to be measured in the two images and the terahertz brightness temperature of the first part of the human body. The terahertz brightness temperature of the second part of the human body to be measured in the Hertz image, so that the terahertz brightness temperature of the second part is calibrated through the relationship between the infrared brightness temperature of the first part and the terahertz brightness temperature of the first part , to get a more accurate body temperature. Then, by comparing the body temperature of the detected human body with a preset temperature threshold, it is possible to identify and monitor the detected persons with abnormal body temperature. In this way, it is possible to effectively prevent unhealthy personnel with abnormal body temperature from causing an infectious epidemic, so that unhealthy personnel with abnormal body temperature may not be able to endanger the health and safety of others.

In another embodiment of the present application, as shown in FIG. 3 , the above method may further include:

Step 301: Obtain a terahertz image of the human body under test;

Step 302: Based on the terahertz image, determine whether the detected human body is suspected of hiding a suspect.

Here, the suspect may refer to a prohibited item or a dangerous item.

In practical applications, when the body under test carries a suspect, the suspect will block the terahertz radiation reflected or emitted by the corresponding part of the body under test, so that the terahertz radiation of the body under test will be blocked. Shadows are formed on the hertz image, and then, the terahertz image of the tested human body can be used to determine whether the tested human body is suspected of hiding a suspect.

Exemplarily, if it is determined that the tested human body is suspected of hiding a suspect, an early warning message may be sent to the security inspector, so that the security inspector can process the suspect or the detected human body. If it is determined that the inspected person is not suspected of hiding the suspect object, a message for instructing the security inspection to pass can be sent to the security inspector, so that the inspected human body can be released by the security inspector.

So far, the body temperature measurement process based on infrared and terahertz has been completed.

It can be seen from the above content that the infrared and terahertz-based body temperature measurement methods provided by the embodiments of the present application firstly obtain the infrared brightness temperature of the first part of the human body to be measured; wherein, the first part is the exposed part; Measure the terahertz brightness temperature of the first part of the human body and the terahertz brightness temperature of the second part of the human body to be tested; the second part is a different part from the first part; finally, according to the infrared brightness temperature of the first part The terahertz brightness temperature of the first part is calibrated to the terahertz brightness temperature of the second part to obtain the body temperature of the measured human body. In this way, an accurate body surface temperature of the measured human body under the clothes can be obtained. However, the temperature of the body surface of the tested human body under the clothes will not be affected by the external environment, therefore, an accurate body temperature of the tested human body is obtained. Thus, the measurement accuracy of the human body temperature is improved.

Based on the same inventive concept, the embodiments of the present application provide a body temperature measurement device based on infrared and terahertz. FIG. 4 is a schematic structural diagram of a body temperature measurement device based on infrared and terahertz in an embodiment of the present application. Referring to FIG. 4 , the body temperature measurement device 40 may include:

The first obtaining unit 401 is used to obtain the infrared brightness temperature of the first part of the human body under test; wherein, the first part is a bare part;

The second obtaining unit 402 is configured to obtain the terahertz brightness temperature of the first part of the human body to be tested and the terahertz brightness temperature of the second part of the human body to be tested; wherein, the second part is a different part from the first part;

The first obtaining unit 403 is configured to calibrate 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, so as to obtain the body temperature of the measured human body.

In the embodiment of the present application, the first obtaining unit is configured to calibrate 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, so as to obtain the body temperature of the measured human body, It includes: a first obtaining unit, used to calculate the temperature of the first part of the human body to be measured according to the infrared brightness temperature of the first part; according to the terahertz brightness temperature of the first part, the first function is preset according to the temperature of the first part. The calibration parameters are calculated according to the relationship; wherein, the preset first functional relationship is the functional relationship between the terahertz brightness temperature and the temperature without considering the attenuation of the clothing on the terahertz; Attenuation coefficient; based on the calibration parameters, the terahertz brightness temperature and the attenuation coefficient of the second part, the body temperature of the measured human body is calculated by a preset second functional relationship; wherein, the preset second functional relationship is to consider the attenuation of clothing to terahertz The functional relationship between the terahertz brightness temperature and temperature.

In the embodiment of the present application, the first obtaining unit is used to obtain the attenuation coefficient of the clothing of the tested human body in the terahertz band, including: a first obtaining unit, used to obtain the terahertz of the first target part of the tested human body The brightness temperature is the terahertz brightness temperature of the second target part of the human body under test; wherein, the first target part and the second target part are both parts of the human body covered by clothing; the calibration parameters and the terahertz brightness temperature of the first target part are substituted into Presetting the second functional relationship to obtain the first equation; substituting the calibration parameters and the terahertz brightness temperature of the second target site into the preset second functional relationship to obtain the second equation; combining the first equation and the second equation Subtraction to obtain the third equation; substitute the preset human body temperature difference into the third equation to calculate the attenuation coefficient; wherein, the human body temperature difference refers to the temperature of the first target part of the human body and the temperature of the second target part difference between the temperatures.

In the embodiment of the present application, the first obtaining unit is used to calculate the temperature of the first part of the human body to be measured according to the infrared brightness temperature of the first part, including: a first obtaining unit, used to give the infrared brightness of the first part Divide the temperature by the infrared emission coefficient to obtain the temperature of the first part of the human body to be measured; The temperature corresponding to the temperature; the calculated temperature is determined as the temperature of the first part.

In the embodiment of the present application, the first part of the human body to be measured is the face of the human body to be measured; the second part of the human body to be measured is the trunk of the human body to be measured that is covered by clothing.

In other embodiments of the present application, the above-mentioned apparatus may further include: a second obtaining unit, configured to obtain a terahertz image of the human body under test; a first determination unit, configured to determine whether the human body under test is suspected of hiding suspicion based on the terahertz image thing.

In other embodiments of the present application, the above-mentioned device may further include: a second determination unit, configured to determine whether the body temperature of the detected human body is greater than or equal to a preset temperature threshold; an output unit, configured to determine whether the body temperature of the detected human body is greater than or equal to Equal to the preset temperature threshold, output warning information.

Based on the same inventive concept, the embodiments of the present application provide a security inspection device based on infrared and terahertz. FIG. 5 is a first structural schematic diagram of a security inspection device in an embodiment of the present application. Referring to FIG. 5 , the security inspection device 50 may include: a terahertz-based detection device 501 and an infrared-based and terahertz-based detection device 501 in the above one or more embodiments Hertz body temperature measurement device 40; wherein, the detection device 501 includes: a third acquisition unit 5011 for acquiring a terahertz image of the human body under test; a third determination unit 5012 for determining whether the human body under test is suspected of being suspected based on the terahertz image Hide suspects.

It can be seen from the above content that the security inspection equipment based on infrared and terahertz provided by the embodiments of the present application, on the one hand, through the infrared brightness temperature of the first part of the human body to be tested and the terahertz brightness temperature of the first part of the human body to be tested, By calibrating the terahertz brightness temperature of the second part of the human body to be measured, the surface temperature of the human body to be measured under the clothes can be obtained. However, the temperature of the body surface of the tested human body under the clothes will not be affected by the external environment, therefore, the accurate body temperature of the tested human body is obtained. Thus, the measurement accuracy of the human body temperature is improved. On the other hand, based on the terahertz image, it can also be determined whether the tested human body is suspected of hiding a suspect. In this way, the infrared and terahertz-based security inspection equipment provided by the embodiment of the present application is arranged in places such as airports, customs, and public places, which can not only detect the suspected objects hidden in the clothes of the tested human body (that is, dangerous objects or prohibited objects) Recognition, and can also detect the body temperature of the tested human body, without the need for security personnel to hold infrared body temperature measuring instruments (such as infrared temperature detectors, infrared thermal imaging cameras, etc.) It can realize comprehensive and rapid security inspection, and improve the security inspection pass rate.

Based on the foregoing embodiments, the embodiments of the present application provide a security inspection device. FIG. 6 is a second structural schematic diagram of the security inspection device in the embodiment of the application. Referring to FIG. 6 , the security inspection device may include: a terahertz imaging module 601, an infrared imaging module 602, and a data processing module; wherein,

The terahertz imaging module 601 is used to inspect the human body 600 to be tested by using the terahertz imaging technology, and collect the terahertz imaging data (ie, digital signals of terahertz) of the human body 600 to be tested;

The infrared imaging module 602 is used for inspecting the measured human body 600 by using infrared imaging technology, and collecting infrared imaging data (ie, infrared digital signals) of the measured human body 600;

The data processing module is used for receiving the terahertz imaging data transmitted by the terahertz imaging module and the infrared imaging data transmitted by the infrared imaging module; respectively processing the terahertz imaging data transmitted by the terahertz imaging module and the infrared imaging data transmitted by the infrared imaging module The imaging data is processed to obtain a terahertz image and an infrared image of the tested human body 600 respectively; it is also used to judge whether the tested human body 600 is suspected of hiding suspected objects (such as dangerous objects or prohibited items based on the terahertz image of the tested human body 600 ). Item); also used to select the first part of the tested human body 600 in the two pictures based on the terahertz image and the infrared image of the tested human body 600, such as the infrared brightness temperature value T1 and the terahertz brightness temperature value of the same point on the exposed face T1', select the second part of the measured human body 600 in the terahertz image, such as the terahertz brightness temperature value T2 of another point on the human torso, and then calibrate T2 through the relationship between T1 and T1' 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 600 is obtained. In this way, the accurate body temperature value of the human body to be measured is obtained, and further, the inspected personnel with abnormal body temperature are identified and monitored.

In addition, the data processing module is also used for judging the suspects that the tested human body is suspected of hiding according to the terahertz image. If it is judged that the tested human body is suspected of hiding suspect objects, the security inspector is requested to deal with the inspected person; if it is determined that the tested human body is not suspected of hiding suspect objects, the inspected person will be released.

In practical applications, the terahertz imaging module can obtain a terahertz image of the inspected person's body, so that the data processing module can be used to determine whether the inspected person carries a suspect or the like according to the terahertz image. Specifically, when a suspect is carried on the body of the inspected person, the suspect will block the terahertz radiation reflected or emitted by the corresponding part of the inspected person's body, which will form a shadow on the terahertz image of the human body, and then judge The corresponding part of the body of the inspected person carried the suspect.

In this embodiment of the present application, still referring to FIG. 6 , the terahertz imaging module 601 may include: a terahertz acquisition device 6011, a terahertz focusing device 6012, a terahertz detector 6013, a terahertz data collector, and a terahertz controller . The terahertz collecting device 6011 is used to collect the terahertz radiation emitted by the human body 600 under test, and the terahertz radiation is focused on the terahertz detector 6013 by the terahertz focusing device 6012 using an optical focusing method. The terahertz detector 6013 is used to receive the terahertz radiation and convert the terahertz radiation into a terahertz analog signal; output the terahertz analog signal to the terahertz data collector; the terahertz data collector is used to receive the terahertz detector 6013. Output terahertz analog signal; perform signal and data processing on the received analog signal to obtain a terahertz digital signal as terahertz imaging data. In addition, the terahertz controller is used to receive control commands from the data processing module to control the operation of the terahertz acquisition device 6011, the terahertz focusing device 6012, the terahertz detector 6013 and the terahertz data acquisition device, for example, for the human body 600 to be tested. Scanning is performed, signals are acquired, and corresponding data and signals are processed to obtain terahertz imaging data of the human body 600 under test.

In this embodiment of the present application, still referring to FIG. 6 , the infrared imaging module 602 may include: an infrared acquisition device 6021 , an infrared detector 6022 , a blackbody calibration device 6023 , an infrared data collector and an infrared controller. The infrared collection device 6021 is used to collect the infrared radiation emitted by the human body 600 under test, and focus the infrared radiation on the infrared detector 6022 . The infrared detector 6022 is used to receive the infrared radiation collected by the infrared acquisition device 6021, convert the infrared radiation into an infrared analog signal, and output the infrared analog signal to the infrared data collector. The infrared data collector is used to process the infrared analog signal generated by the infrared detector 6022 to form an infrared digital signal as infrared imaging data; and transmit the infrared digital signal to the data processing module for image processing. The infrared controller receives the control command of the data processing module to control the operation of the infrared acquisition device 6021, the infrared detector 6022 and the infrared data acquisition device, for example, scans, collects signals and processes the corresponding data and signals by comparing the measured human body 600 to obtain Infrared imaging data. The black body calibration device 6023 is used to calibrate the infrared imaging module 602 in real time according to the ambient temperature of the security inspection place.

In practical applications, the infrared imaging can be active. In this case, the infrared imaging module can also include an infrared radiation source for emitting infrared radiation emitted by the human body under test; or, the infrared imaging can be passive, and the infrared imaging module Collects the infrared radiation emitted by the human body under test to generate infrared imaging data.

In practical applications, the motion modes of the infrared acquisition device may include rotation, swing, linear motion, stationary and the like.

Still referring to FIG. 6, the infrared imaging module 602 can be integrated on or in the terahertz imaging module 601 so that they can share a common physical link, such as for transmitting related data and signals link, 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 collectors and controllers, in other embodiments of the present invention, they can also Setting them up to share a data collector and controller allows them to share more physical links and can be processed via the same data processing module.

In an alternative embodiment, the infrared imaging module can 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 video images (if the security inspection equipment If there is a corresponding video camera device or camera), it shares the physical link for data transmission, and finally all data can share a data processing module (such as a computer) for data processing and display, which makes the layout of the security inspection equipment simple and integrated. change.

Further, still referring to FIG. 6 , the security inspection device may be configured with a video camera 603 to collect video images of the human body under test 600 and at the same time count the human body under test 600 . The human body video image formed by the video camera 603 is used to lock the specific person carrying the suspect and is fused with the terahertz image and the infrared image to facilitate comparison and identification.

In this embodiment of the present application, still referring to FIG. 6 , the video camera 603 can be arranged on the horizontal optical axis of the window 604 of the security inspection device and the terahertz optical path of the security inspection device, so as to ensure the size of the collected human video image and the terahertz image. The proportions are equal.

In the embodiment of the present application, still referring to FIG. 6 , the video camera 603 and the infrared acquisition device 6021 use the black body calibration device 6023 to ensure that the size ratio of the acquired video image and the infrared image is equal. The three images constitute correlation consistency, which ensures that the temperature positions collected by each image are consistent, so that through algorithm calculation, the precise body temperature value of the measured human body 600 can be obtained.

In addition, the security inspection equipment can also be equipped with a depth measurement camera to collect the distance information of the human body, so as to collect the distance information between the measured human body and the human body security inspection equipment and accurately identify the position of the measured human body.

Further, the security inspection equipment can use terahertz images and video images to perform alarm identification and sound and light alarms when it finds a human body under test carrying a suspect.

In one example, the data processing module can be implemented by a PC computer or an embedded processing unit.

It can be seen from the above that the security inspection equipment provided by the embodiments of the present application is a human body security inspection imaging device that can measure body temperature synchronously. security check function. One is to use terahertz imaging to conduct real-time dynamic and fast inspection without being affected by the body and clothes of the inspected person. question. Therefore, the security inspection equipment provided in the embodiments of the present application has the advantage that terahertz imaging is not affected by the body and clothes of the inspected person, and has the advantage of being able to accurately measure body temperature based on the combination of terahertz imaging and infrared imaging, and is suitable for a large number of people. Safety checks and body temperature measurement in public places such as fast flow.

Based on the same inventive concept, the embodiments of the present application provide an electronic device. FIG. 7 is a schematic structural diagram of an electronic device in an embodiment of the present application. Referring to FIG. 7 , the electronic device 70 includes: at least one processor 701 ; and at least one memory 702 and a bus 703 connected to the processor 701 ; wherein, The processor 701 and the memory 702 communicate with each other through the bus 703; the processor 701 is used to call the program instructions in the memory 702 to execute the steps of the infrared and terahertz-based body temperature measurement method in the above-mentioned one or more embodiments .

The above-mentioned processor can be a central processing unit (Central Processing Unit, CPU), a microprocessor (MicroProcessor Unit, MPU), a digital signal processor (Digital Signal Processor, DSP), or a field programmable gate array (Field Programmable Gate Array, FPGA) ) and so on. The memory may include non-persistent memory in computer readable media, random access memory (RAM) and/or non-volatile memory, such as read only memory (ROM) or flash memory (Flash RAM). ), 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 methods in the above-mentioned one or more embodiments are implemented in the form of software function modules, and sold or used as independent products, the Can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence or in the parts that make contributions to the prior art. The computer software products are stored in a storage medium and include several instructions for An electronic device (which may be a personal computer, a server, or a network device, etc.) is caused to execute all or part of the methods of the various embodiments of the present application.

Correspondingly, based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored program, wherein, when the program is run, the electronic device where the storage medium is located is controlled to execute one or more of the above. Steps of an infrared and terahertz-based body temperature measurement method in one embodiment.

It should be pointed out here that the descriptions of the above embodiments of the apparatus, security inspection device, electronic device or computer-readable storage medium are similar to the descriptions of the above method embodiments, and have similar beneficial effects to the method embodiments. For technical details not disclosed in the embodiments of the apparatus, security inspection equipment, electronic device or computer-readable storage medium of the present application, please refer to the description of the method embodiments of the present application for understanding.

This application describes a number of embodiments, but the description is exemplary rather than restrictive, and it will be apparent to those of ordinary skill in the art that within the scope of the embodiments described in this application can be There are many more examples and implementations. 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. Unless expressly limited, any feature or element of any embodiment may be used in combination with, or may be substituted for, any other feature or element of any other embodiment.

This application includes and contemplates combinations with features and elements known to those of ordinary skill in the art. The embodiments, features and elements that have been disclosed in this application can also be combined with any conventional features or elements to form unique inventive solutions as defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other inventive arrangements to form another unique inventive arrangement defined by the claims. Accordingly, 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 to be limited except in accordance with the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Furthermore, in describing representative embodiments, the specification may have presented methods and/or processes as a particular sequence of steps. However, to the extent that the method or process does not depend on the specific order of steps described herein, the method or process should not be limited to the specific order of steps described. Other sequences of steps are possible, as will be understood by those of ordinary skill in the art. Therefore, the specific order of steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to performing their steps in the order written, as those skilled in the art will readily appreciate that these orders may be varied and still remain within the spirit and scope of the embodiments of the present application Inside.

Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, functional modules/units in the systems, and devices can be implemented as software, firmware, hardware, and appropriate 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 composed of several physical components Components execute cooperatively. 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). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules or other data flexible, removable and non-removable media. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or may Any other medium used to store desired information and which can be 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 can include any information delivery media, as is well known to those of ordinary skill 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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