JP5398784B2 - A device for measuring changes in human dynamic facial temperature by thermography. - Google Patents

Description

The present invention relates to an apparatus for measuring changes in human dynamic facial temperature by thermography. More specifically, the present invention relates to a dynamic temperature of a human face or a head without hair (hereinafter also simply referred to as “face”). The present invention relates to a technique for accurately, rapidly and continuously measuring changes.

As shown in Patent Document 1 below, the present inventor measures human facial psychological or mental changes by measuring temporally changing facial temperature movements based on human facial temperature information obtained by thermography. Has been analyzed.
In recent years, thermography has become widespread, and many methods for measuring human body temperature and the like using thermography have come to be seen. However, it has been technically difficult to quickly and accurately capture the dynamic changes in human face temperature by thermography. That is, in order to convert the radiant heat recorded by the thermography into a temperature, it is necessary to consider the influence of the ambient temperature of the subject, especially when measuring a slight temperature change such as the human face temperature, It is important to measure the ambient temperature that affects radiant heat. In particular, in order to continuously measure the temperature change of the subject's face at short time intervals, it is necessary to make corrections as needed while simultaneously measuring the temperature around the subject.
However, in reality, it is not easy to convert the temperature into consideration while always taking into account the ambient temperature of the subject away from the camera. The infrared camera itself also has a unique temperature characteristic, which affects temperature changes. In addition, human body temperature is controlled to be almost constant except for a specific state in order to maintain biological functions. However, body surface radiant heat is easily affected by changes in ambient temperature and depends on the state of blood vessels in the skin. Also changes.

  In addition, in the body temperature measurement by the conventional thermography, the internal temperature of the camera is used as the ambient temperature for the temperature measurement by the radiant heat in the process of converting the thermal image data obtained by the infrared camera to the temperature. There is an example. However, when measuring a temporally weak temperature change of a living body, the temperature in the camera rises with the passage of time, so that there is a problem that the temperature change appears to be small and the ambient temperature is not accurately reflected.

Japanese Patent No. 2868192

The object of the present invention is to further improve the technique disclosed by the present inventor in the above-mentioned Patent Document 1, and more specifically, to eliminate the influence of the change in ambient temperature as described above when measuring the temperature change by thermography. However, an object of the present invention is to provide a device for measuring a human dynamic facial temperature change by thermography capable of accurately, rapidly and continuously measuring a minute temperature change of the human face or the like.

In order to achieve the above object, an apparatus for measuring a dynamic facial temperature change of a subject according to the present invention includes a thermography for measuring a temperature change of a human face being a subject or a head without hair; The human face or hair is placed in close proximity, radiating the ambient temperature of the person with infrared rays, and measuring the temperature simultaneously with the human face or hairless head with an infrared camera constituting the thermography. And a calibrator for calibrating the measured temperature of the head without a temperature to the ambient temperature, the calibrator having a high thermal conductivity metal plate and a temperature in at least a partial region of one side of the metal plate. A black body coating is provided to define the area to be measured, and the surroundings of this black body coating are surrounded by a light shielding frame. The thermography refers to the ambient temperature indicated by the black body coating of the calibrator. Characterized in that form to perform calibration of the temperature of the head without facial or hair of the person to.

The apparatus further includes a heart rate monitor, which is connected to a computer constituting the thermography, and output data of the heart rate monitor includes output data of the heart rate monitor.
The continuous shooting time interval of the infrared camera is preferably set to 1/100 second or more and 1 second or less.
The reason for setting the shooting interval to 1/100 second or more and 1 second or less is that it takes time to transfer the calculation result, and it is actually necessary to make it less than 1/100 second. This is because if it exceeds 1 second, it may fail to capture the temperature change of the face that changes in a short time.

The material of the metal plate or metal foil of the calibrator is most preferably copper, but other than that, aluminum and silver can be used, and various other metals and alloys having good heat conduction can be used.
The metal plate or the metal foil of the calibrator is formed as a frame-like frame provided with a cavity of the face of a human being who is a subject at the center, and the black body cover is provided on at least a part of the frame It is recommended that

  Preferably, the calibrator is preferably formed by attaching a temperature gauge to the back surface of the metal plate or metal foil in the area covered with the black body so that the calibrator itself can be calibrated based on the output data of the temperature gauge. Composed.

In the present invention, a calibrator that directly measures the temperature around the subject is used, and the data obtained from the calibrator is used to calculate the relative radiant heat per area in consideration of the characteristics unique to the thermography device, By measuring the temperature change of the subject's face, etc. independently, the dynamic temperature change of the human face, etc., which changes minutely and rapidly, can be measured accurately and immediately without the influence of the ambient temperature. Became possible. As a result, changes in human face temperature can be measured in real time with a general-purpose personal computer.
In addition, the calibrator calibrates the amount of infrared rays at a constant emissivity of the black body by applying a black body coating with a high heat absorption rate to at least a partial region of one side of the metal plate or metal foil, The black body covered area quickly becomes the same temperature as the ambient temperature, and the temperature is measured quickly with a temperature gauge provided on the back side of a metal plate or metal foil with high thermal conductivity, and the actual temperature value measured simultaneously. It is something that can know. Since the ambient temperature change can be calibrated in advance, it can be corrected without measuring the temperature gauge voltage at the same time. Thus, based on the photographing data of the black body covering portion of the calibrator photographed by the infrared camera, calibration is performed when calculating the temperature from photographing data such as the face of the subject. Therefore, a slight temperature change of the face or the like can be measured accurately, quickly and continuously without being affected by changes in the ambient temperature of the subject's face or the like.
In the above case, by using a heart rate monitor (or electrocardiograph) in combination, and displaying the heart rate data (or electrocardiogram data) directly or with appropriate editing along with dynamic temperature changes on the subject's face, etc. The mental change of the subject can be determined more accurately.

It is a block diagram which shows one Example of the dynamic facial temperature change measuring apparatus by the thermography which concerns on this invention. It is a graph which shows the relationship of the temperature display of the black body furnace by thermography with respect to ambient temperature change. It is explanatory drawing which shows the example (measurement example 1) which measures the temperature change of a soldering iron with a thermography using the thing of 1st Example of the calibrator which concerns on this invention. It is a graph which shows the relationship between the electric potential change from the temperature gauge affixed on the copper plate back surface of the calibrator shown in FIG. 3, and the temperature display of a contact-type digital thermometer. It is a block diagram which shows the structure of the program for the temperature calibration in the measurement example 1 shown in FIG. It is a graph which shows the relationship between what converted the temperature of the soldering iron front-end | tip part in the measurement example 1 shown in FIG. 3 into the amount of radiant heat, and a calibrator infrared image average RGB value. It is a temperature calibration distribution map in the ambient temperature estimated by the interpolation method. It is a graph which shows the result (measurement example 2) which measured the temperature change of the human face by the thermography using the thing of the said 1st Example of the calibrator which concerns on this invention with the measurement result by the conventional thermography. . It is explanatory drawing which shows the thing of 2nd Example of the calibrator which concerns on this invention. It is explanatory drawing which shows the state which displayed on the display apparatus the result of having measured the temperature change of the human face using the thing of the said 1st Example of the calibrator which concerns on this invention, and the thing of 2nd Example.

  Hereinafter, preferred embodiments of an apparatus and a measuring method for measuring a dynamic face temperature change of a human by thermography according to the present invention and a calibrator according to the present invention used therefor will be described with reference to the drawings. The present invention is not limited to these embodiments, and various design changes can be made in accordance with the usage situation and the like within the technical scope of the present invention.

  FIG. 1 is a block diagram showing an embodiment of an apparatus for measuring a human dynamic facial temperature change according to the present invention. In FIG. 1, reference numeral 1 denotes an infrared ray for photographing a face or the like of a subject whose temperature change is to be measured. Camera 2 is a converter for digitally converting a thermal image from the infrared camera, 3 is a computer for calculating the temperature of the face of the subject in accordance with a predetermined program based on data from the converter, 4 is an output from the computer A printer for printing data, 5 a display device for displaying output data from a computer, 6 a heart rate monitor (or electrocardiograph 6), and 7 a black body coating on at least a part of the surface of a copper plate or the like as will be described later. A calibrator, T, is a thermography that combines the above devices 1-5. Of course, as the computer 3, in addition to a personal computer, a computer for business use such as a workstation having a larger capacity and a higher function may be used.

The infrared camera 1 can continuously photograph the subject's face and the like many times at short time intervals of 1/100 second or more and 1 second or less by a control circuit (not shown).
The reason why the imaging interval of the infrared camera is set to 1/100 second or more and 1 second or less is that, as described above, it takes time to transfer the calculation result. This is because the necessity of setting the time to less than 1 second is scarce, and if it exceeds 1 second, the change in the temperature of the face that changes in a short time may not be captured.
The heart rate meter 6 (or electrocardiograph 6) measures the heart rate (or electrocardiographic data) of the subject, the output data is input to the computer 3, and changes in the heart rate (or electrocardiographic data) are directly or appropriately determined. The information is edited and displayed on the display device 4 and the printer 5 together with the temperature change of the face of the subject.

  The computer 3 has a function of calculating the temperature of the face of the subject or the head without hair according to a predetermined program based on the data from the converter 2, and in the present invention, the computer 3 is photographed by the infrared camera 1. On the basis of the photographing data of the black body covering portion of the calibrator 7, it is programmed to perform calibration when calculating the temperature of the face of the subject or the head without hair.

The calibrator 7 applies a black body coating to at least a partial region of one surface of a metal plate or metal foil having high thermal conductivity, and a temperature gauge on the back surface of the metal plate or metal foil in the region where the black body coating is applied. It is attached, and is arranged at a position where it can be photographed with the subject's face or head without hair by the infrared camera.
As the material of the metal plate or metal foil having high thermal conductivity, copper is most preferably used. In addition, aluminum and silver can be used, and various other metals and alloys having high thermal conductivity are also used. What can be done is as described above.
Further, the metal plate or the metal foil is formed as a frame-like frame whose central part is a cavity of a human face size, and is continuously shot by an infrared camera in a state in which the face of the subject is viewed from the cavity part. It is recommended to do so.

A combination of the infrared camera 1, the converter 2, the computer 3, the printer 5, and the display device 5 is provided on the market as a thermography T.
More specific description will be given below.

[Thermographic temperature calibration]
The temperature display of an example thermography (manufactured by NEC Sanei Co., Ltd .: product number TH5104) that can be used in the present invention is calibrated with the temperature analysis software attached to the product. As shown in FIG. It was revealed that the measurement error was large near the ambient temperature that is used most routinely. Further, the temperature indication value error was large for about 90 minutes after the power was turned on, and the fluctuation of about 0.5 ° C. continued thereafter. Therefore, as a result, it seems difficult to measure the living body temperature according to the present invention using the thermography. However, it was decided to consider whether image processing could be improved by using computer speedup, and resumed from recalibrating temperature using the output NTSC signal of the infrared camera.
Shooting data was first saved as a moving image, and the moving image information was converted into a still image, and image processing was performed with development software.

[Measurement Example 1]
<Temperature calibration>
If there are several adults in a small room, the ambient temperature rises after a few minutes, but the ambient temperature measurement sensor inside the camera housing cannot measure these changes. Therefore, in the present invention, the ambient temperature is detected by a separately prepared calibrator.

<First embodiment of calibrator (calibrator for ambient temperature measurement)>
The thing of the 1st Example of the calibrator based on this invention was produced as the calibrator 7 shown in FIG. 3, for example.
That is, the illustrated calibrator 7 applies a black body coating 72 to at least a partial region of one surface of a metal plate (or metal foil; hereinafter simply referred to as a metal plate) 71 having a high thermal conductivity, and the black body coating. The temperature gauge 73 is attached to the back surface of the metal plate in the region 72. When photographing the area of the black body cover 72 by thermography, a light shielding frame 74 made of paper or the like is attached so as to surround the periphery of the black body cover 72 so that ambient reflected light does not enter from the metal plate 71. It is desirable to keep it. A contact-type digital thermometer 75 was also attached to the back surface of the metal plate 71.
As the material of the metal plate (or metal foil) 71, a material having high thermal conductivity such as copper, aluminum, silver or the like is used. In this specification, an example using a copper plate will be described, but the present invention is not necessarily limited thereto.
More specifically, the calibrator 7 of the illustrated example applies a black body paint (black matte heat-resistant paint, main component silicon resin: manufactured by Asahi Pen Co., Ltd.) to a part of the front surface of the copper plate 71 to form a black body. A coating 72 is formed, a temperature gauge 73 (manufactured by Kyowa Denki Co., Ltd .: TA-12UA) is attached to the back surface of the copper plate 71 of the black body coating 72, and the copper plate 71 is passed through a strain amplifier (not shown). The temperature change is measured. The temperature gauge 73 is used for calibrating the calibrator 7 itself, and is not required to be used when acquiring photographing data such as a human face.
In the calibrator 7 shown in FIG. 3, the horizontal width a of the copper plate 71 is 200 mm, the vertical and horizontal lengths b of the black body coating 72 are 110 mm, and the vertical and horizontal lengths c of the light shielding frame 74 are 150 mm. However, it is not necessarily limited to this.
Warm air was applied from a position 200 mm away from the calibrator 7 to warm the entire copper plate 71 of the calibrator 7, and a uniform temperature distribution was generated on the entire blackbody coating 72. The temperature change was caused by changing the distance and warming time between the hot air and the calibrator 7.
As for the temperature, (1) the potential change obtained from the temperature gauge 73 is taken into the computer 3 (Sony Corporation, personal computer VAIO-RZ) shown in FIG. 1 via the A / D converter at a sampling frequency of 500 Hz. ) Using a contact-type digital thermometer 75 (TD-70, manufactured by IWASU-ELECTRIC), the temperature change of the back surface of the copper plate 71 (capable of direct reading and analog potential output) is captured at intervals of 10 seconds, and (3) the infrared camera 1 also photographed and recorded the black body covering 72 portion on the copper plate 71 at the same time. After calibrating the calibrator 7 itself based on the output data of the temperature gauge 73, the calibrator 7 is placed near the subject and used as an ambient temperature monitoring device.
FIG. 4 shows the relationship between the potential change from the temperature gauge 73 attached to the back surface of the copper plate 71 of the calibrator 7 and the temperature display of the contact type digital thermometer 75. As shown in the figure, the relationship between temperature and output potential is constant. The straight line in the figure shows a regression line, and this straight line was used for radiant heat conversion.

<Temperature calibration using soldering iron>
As shown in FIG. 3, the black body paint was applied to the vicinity of the tip 81 (d = 45 mm) of the soldering iron 8 (H-110, manufactured by HOZAN) to make the emissivity constant. In order to perform temperature calibration by regarding this as a subject, the voltage is changed by a voltage regulator to change the temperature of the black body paint portion of the tip 81 within a range of 24 ° C. to 40 ° C., and at the same time the tip is contacted as described above The temperature was calibrated by recording with a digital thermometer and thermography.
In order to investigate how much the ambient temperature affects the soldering iron measurement, the ambient temperature was adjusted to 20 ° C., 24 ° C., and 28 ° C. in a small room with an air conditioner (44 m ² ), as shown in FIG. As described above, the ambient temperature was measured by the calibrator 7 installed at a distance e = 200 mm from the soldering iron 8 by the gantry 9. The relationship between the temperature of the soldering iron tip 81 and the average RGB value at this time is shown in the graph of FIG.

<Program structure>
For the temperature calibration, as shown in FIG. 5, the thermographic infrared camera 1 is used to simultaneously apply the black body paint portion at the tip 81 of the soldering iron 8 and the black body coating 72 portion of the copper plate 71 of the calibrator 7. After shooting and saving the output NTSC signal (black and white image) in MPEG2 format with recording software installed on the personal computer 3 (for example, “GigaPacket (trade name)” from Sony), it is converted into a still image, The software developed by “Visual C ++” was decomposed into numerical values for each pixel, and the thermography was converted into radiant heat by referring to the density information by the gray scale bar that was calibrated by the sensor in the housing. At this time, by using only the average value of the R, G, and B3 colors by conversion based only on the R value (or G value, B value), a good linearity of the color component characteristics was obtained. Average RGB value ”.
The performance of the thermography was taken at a focal length of 30 cm to infinity, a scanning angle length of 21.5 °, width of 21.5 °, temperature of 256 gradations, temperature resolution of 0.3-2 ° C, and 22 frames per second. ing.
A commercially available program (for example, Digital Imager: Hyper Image II) can be used as a computer program for performing the above-described conversion and the like.
In this example, when measuring the change in the facial temperature of the subject, the distance from the infrared camera 1 to the subject is 1 m so that the subject's face is photographed as large as possible on the screen of the infrared camera, and the measured facial temperature range of the subject 24 ° C. to 40 ° C., and the subject's posture is in a resting position, and a slight fluctuation occurs, but care should be taken not to go outside the measurement target screen. Since the external output of the thermography is an NTSC signal, the goal was to perform image processing at 30 frames per second.

<Calculation of radiant heat>
Record the temperature change of the part of the black body covering 72 of the calibrator 7 by thermography placed 1m away from the calibrator 7, and substitute the indicated value (° C) into the Stefan-Boltzmann equation as the object temperature change. On the other hand, the relationship between the temperature of the object per unit area and the amount of radiant heat per unit area was obtained.

(1) Radiation heat quantity Q ₁ = σ (T ₀ ⁴ −T _a ⁴ )
Q ₁ : Radiant heat from unit area (m ² ) (W / m ² )
σ: Stefan Boltzmann's constant
5.67 × 10 ⁻⁸ (W / m ² · K ⁴ )
T ₁ : Absolute temperature of the object surface (K)
T _a : Air temperature (° C.) away from the object
(2) natural convective heat _{Q 2 = H m (t 0} -t a)
Q ₂ : amount of heat released from the unit area (m ² ) (W / m ² )
(3) Average natural convection heat transfer coefficient _{H m = 1.173 × (t 0} -t a) -1/3
H _m : Average natural convection heat transfer coefficient (W / m ² · ° C)
t ₀ : temperature of the object surface (° C.)
t _a : Air temperature away from the object (° C.)
(4) Total amount of radiant heat Q = Q ₁ + Q ₂
Q: Total radiant heat (W / m ² )

The total amount of radiant heat generated from the target object was calculated using the above formula.
In order to calibrate the temperature of the subject (the person who measures the change in the temperature of the face), an experiment was first performed with water and liquid paraffin in a thermostatic bath. The temperature calibration gave very good linear characteristics, but problems such as difficulty in temperature control and the possibility of water vapor being generated and adverse effects on the infrared camera occurred, and the measurement target was changed to a soldering iron. .

<Calibration by soldering iron ambient temperature>
FIG. 6 shows the relationship between “thermographic temperature information decomposed into average RGB values” and “radiant heat at the soldering iron tip” measured by a contact type digital thermometer. 6A shows a distribution curve when the room temperature is constant at 20 ° C., (b) constant at 24 ° C., and (c) constant at 28 ° C., the regression curve shows (a) correlation coefficient 0.977, accuracy. ± 7.446 (W / m ² ),
(B) Correlation coefficient 0.9819, accuracy ± 7.446 (W / m ² ),
(C) The correlation coefficient was 0.971, and the accuracy was ± 5.007 (W / m ² ).

<Calibration of non-measurement parts by interpolation method>
The change in the ambient temperature is not uniform, and a complicated temperature change may occur depending on the environment, but the temperature information obtained from the target object also changes due to the change in the ambient temperature. However, since the calibration for all temperature changes is actually very inefficient, the results of FIG. 6 indicate that the radiant heat amounts at ambient temperatures of 20 ° C., 24 ° C., and 28 ° C. show that the slopes of the respective regression lines are nearly parallel. As shown, an attempt was made to calibrate the temperature at all ambient temperatures by interpolation to allow correction of any ambient temperature within the range of 20-28 ° C.

FIG. 7 shows the result of calibration by the interpolation method.
In FIG. 7, (a) ambient temperature 20 ° C., (b) ambient temperature 24 ° C., (c) ambient temperature 28 ° C.
The results of estimating a temperature calibration diagram with an ambient temperature of 22 ° C. between (a) and (b) and an ambient temperature of 26 ° C. between (b) and (c) are shown.
In order to confirm the accuracy of the calibration map estimated by this interpolation method, the distribution map measured from the actual ambient temperature was compared with the estimated distribution map. As a result, the tolerance was ± 4.965 (W / m ² ) at an ambient temperature of 22 ° C. and ± 6.236 (W / m ² ) at an ambient temperature of 26 ° C.
From this result, if the ambient temperature is between 20 ° C. and 28 ° C. by using the interpolation method, it is possible to estimate an arbitrary temperature generated therebetween.

[Measurement Example 2]
<Human facial temperature measurement>
Using this measurement system, the human face temperature was measured.
After obtaining the consent of the test subject, the thermography was recorded for 60 seconds when the test subject was in the correct sitting position, and then the patient was instructed to take a deep breath once and optionally stop breathing for 30 seconds. It was measured for 300 seconds including the subsequent recovery process. The time elapsed was reported in advance, but the countdown was read 10 seconds in advance to get the subject's motivation and prepared to stop breathing in advance. In order to measure these face temperatures, an infrared camera was matched with the height of the subject's face, and the infrared camera was fixed at a position 1 m in a straight line distance from the forehead portion of the face. For facial photography, subjects were not allowed to have their hair on their forehead. The calibrator 7 for measuring the ambient temperature was placed at a position of 0.5 m from the subject, and the ambient temperature change was captured in a personal computer in real time.
A comparison was made between the infrared measurement system created in this example and the TH5107 remote program (thermographic accessory) developed by NEC Sanei Co., Ltd.
When the measurement data of the heart rate (or electrocardiogram data) of the subject by the heart rate monitor (or electrocardiograph) 6 is also adopted at the same time, the measurement data is input to the computer 3 to change the temperature of the subject's face or the like. At the same time, the data is output and displayed by the display device 4 and the printer 5.

In the TH5107 remote program, the image processing speed can be set in units of seconds in a real-time memory (which can store up to 64 thermal images) inside the thermography. In order to process all 300 seconds in this experiment, the processing time was set at a speed of 1 sheet per 5 seconds. The measurement target range was only the forehead part, and the average value of the amount of radiant heat generated from the forehead part was calculated.
Using this temperature calibration graph, convert the voltage obtained from the temperature gauge to the ambient temperature with accuracy (maximum deviation) ± 0.580 ° C when the room temperature changes in the range of 19 ° C to 37 ° C. I was able to. (However, when using the calibrator 7 to measure the ambient temperature, it was necessary to acclimate to the ambient temperature for 15 minutes or more before starting the experiment.)

  The obtained result is shown in FIG. The lower solid line graph is obtained by converting the amount of radiant heat calculated by the measurement system into temperature information, and the upper dotted line graph is temperature information obtained by the TH5107 (NEC Sanei) remote program. The measurement result shows that the temperature tends to rise slightly in the preparation state 10 seconds before breathing stop, and the temperature information does not change so much during breathing stop, but the temperature of the forehead part decreases in the recovery process after breathing stop I guess it is. In the dotted line graph (TH5107), it is difficult to estimate the tendency with respect to the temperature change.

From this result, it can be inferred that a physiological function change caused by stopping breathing occurs in the face portion. By stopping breathing, the heart rate decreases and blood pressure increases. Although the facial temperature rises due to the blood pressure temporarily increased due to this influence, the blood pressure decreases with the start of breathing, and thus the blood flow volume is reduced, and it is considered that the facial temperature is lowered due to the influence.
FIG. 8 shows a value converted into temperature information using an electrical signal from a temperature gauge obtained by averaging every 10 seconds by an ambient temperature measurement system, for example, but is a short experiment of about 5 minutes. Therefore, no change in the ambient temperature is seen.

<Second embodiment of calibrator>
FIG. 9 shows a second embodiment of the calibrator according to the present invention. In FIG. 9, a front view of the calibrator 10 is drawn at the center, a cross-sectional view along the line AA is drawn at the bottom, and a cross-sectional view along the line BB is drawn at the left side.
Similar to the calibrator 7 shown in FIG. 3, the calibrator 10 applies a black body coating 102 to at least a partial region of one surface of a metal plate (or metal foil) 101 such as a copper plate having high thermal conductivity, A temperature gauge 103 is attached to the back surface of the metal plate in the region to which the black body coating 102 is applied.
The main difference from the calibrator 7 is that the central portion of the metal plate 101 is a human face-sized cavity 104 and the entire metal plate 101 is formed in a frame frame. The face of the subject (or head without hair) is configured to enter the central cavity 104. In the illustrated example, the black body coating 102 is formed on the surface of the metal plate 101 at the lower side portion of the cavity 104, but the arrangement and area of the black body coating 102 are not limited to the illustrated example.
This calibrator 10 is a table-top type, and a subject sitting on a chair allows his / her face or head to look into the infrared camera from the central cavity of the calibrator 10 so that photographing and measurement of ambient temperature change can be performed. It is designed to be accurate, quick and easy.
The dimensions of each part of the calibrator 10 are, for example, f = 300 mm, g = 240 mm, h = 400 mm, and i = 300 mm, but are not necessarily limited thereto.
As the material of the metal plate (or metal foil) 101, as in the first embodiment, a material having high thermal conductivity such as copper, aluminum, silver or the like is used. Black body paint (black matte heat-resistant paint, main component silicone resin: manufactured by Asahi Pen Co., Ltd.) can be applied and the back surface temperature gauge 103 can be the same as in the first embodiment, but they are not necessarily It is not limited to. The calibration method performed using the calibrator 10 is the same as that of the calibrator 7.

  FIG. 10 is a thermographic image in which the subject looks into the face from the central cavity 104 of the calibrator 10 according to the second embodiment of the present invention as shown in FIG. 9 and only the face of the subject is photographed. In this case, the black body covering 102 is present immediately below the face, the ambient temperature in the vicinity of the face can be measured more accurately, and the face range for image processing can be easily set, making the face more accurate and quick. Temperature change can be measured. The result of calibrating and calculating the ambient temperature using the calibrator according to the present invention is displayed in a graph as shown in FIG.

  The present invention is not limited to the above-described embodiments. For example, the size and shape of the metal plate or metal foil of the calibrator, the arrangement, size, forming means, etc. of the blackbody coating are within the scope of the object of the present invention. The design can be modified as appropriate, and therefore the present invention encompasses all modified embodiments within the scope of the claims.

  In accordance with the present invention, a unique calibrator that directly measures the ambient temperature of the subject is used, and the data obtained therefrom is used to calculate the relative radiant heat per area taking into account the unique characteristics of the thermographic device. In addition, by independently calculating the change in room temperature and the change in temperature of the subject, it was possible to immediately measure the change in temperature of the subject that was minute and rapidly changing. As a result, even a slight temperature change such as the human face temperature can be accurately measured in real time by a general-purpose personal computer.

DESCRIPTION OF SYMBOLS 1 Infrared camera 2 Converter 3 Computer 4 Display apparatus 5 Printer 6 Heart rate monitor (or electrocardiograph)
7 Calibrator 71 Metal Plate 72 Black Body Cover 73 Temperature Gauge 74 Shading Frame 75 Contact Digital Thermometer 8 Soldering Iron 9 Mounting Base 10 Calibrator 101 Metal Plate 102 Black Body Cover 103 Temperature Gauge 104 Cavity T Thermography

Claims (6)

A thermography for measuring a change in temperature of the face of a human being who is a subject or a head without hair, and an infrared camera that is placed in the vicinity of the human and radiates the ambient temperature of the human by infrared rays and constitutes the thermography Comprising a calibrator for calibrating the measurement temperature of the human face or head without hair by adjusting the temperature simultaneously with the ambient temperature by measuring temperature simultaneously with the human face or head without hair;
The calibrator provides a metal plate having a high thermal conductivity and a black body coating that defines a region for measuring temperature on at least a partial region of one surface of the metal plate, and further surrounds the black body coating with a light shielding frame. The thermography is configured to calibrate the temperature of the human face or the head without hair with reference to the ambient temperature indicated by the black body cover of the calibrator. A device for measuring dynamic facial temperature changes in humans. The said apparatus is further equipped with a heart rate monitor , The said heart rate monitor is connected to the computer which comprises the said thermography, The output data of the said heart rate monitor are also contained in the output data of the said computer. For the measurement of human dynamic facial temperature changes by thermography.   The apparatus for measuring a human dynamic facial temperature change by thermography according to claim 1, wherein a time interval of continuous shooting of the infrared camera is 1/100 second or more and 1 second or less.   The material for the metal plate or the metal foil of the calibrator is any one of copper, aluminum, and silver, for measuring a human dynamic facial temperature change by thermography according to any one of claims 1 to 3. apparatus. The metal plate or the metal foil of the calibrator is formed as a frame-like frame provided with a cavity of the face size of a human being who is a subject at the center, and the black body cover is provided on at least a part of the frame. An apparatus for measuring a human dynamic facial temperature change by thermography according to any one of claims 1 to 4.   The calibrator is configured by attaching a temperature gauge to the back surface of the metal plate or metal foil in the region covered with the black body, and configured to calibrate the calibrator itself based on output data of the temperature gauge. An apparatus for measuring a dynamic facial temperature change of a human by thermography according to any one of claims 1 to 5.