Body temperature measuring device, body temperature measuring method, and body temperature measuring program

Abstract

To robustly measure the body temperature of an organism relative to the temperature of an environment, without contact.SOLUTION: A body temperature measurement apparatus comprises: an acquisition unit which acquires the temperature distribution of the body surface of an organism from the intensity of an infrared ray radiated from the body surface; a determination unit which determines first correction corresponding to the progress of the increase or decrease of the temperature of the body surface due to the temperature of an environment in which the organism exists, from the temperature distribution; and a calculation unit which calculates the body temperature of the organism by performing the first correction for the temperature of the body surface obtained from the temperature distribution.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a body temperature measuring device, a body temperature measuring method, and a body temperature measuring program. [Background technology]

[0002] A non-contact thermometer obtains the body surface temperature from the intensity of infrared rays emitted from the body surface of a living body, converts the obtained body surface temperature into the body temperature of the living body by referring to a previously set relational equation between the body surface temperature and the body temperature of the living body, and outputs the body temperature. The body surface is the forehead, the surface of the neck, the surface of the arms, etc. The body temperature is the temperature under the tongue, under the arm, etc.

[0003] Patent Document 1 discloses a method for acquiring personal information, in which a thermal image pattern in an imaging frame of a person photographed by an infrared surveillance camera is compared to a thermal image pattern in each database frame to determine whether the person is male or female (paragraph 0029). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-210354 A Summary of the Invention [Problem to be solved by the invention]

[0005] The relational equation between the body surface temperature and the body temperature of a living organism, which is referred to when a non-contact thermometer converts the body surface temperature into the body temperature of the living organism, changes when the temperature of the environment in which the living organism exists changes. For example, when a living organism exists outdoors where the temperature changes with the seasons, the relational equation changes when the seasons change. For example, the relational equation in summer when the temperature is high is different from the relational equation in winter when the temperature is low. For this reason, it is not easy to measure the body temperature of a living organism robustly against the temperature of the environment using a non-contact thermometer.

[0006] In addition, the relationship between the body surface temperature and the body temperature of the living body at a specific environmental temperature also changes when the time during which the living body is exposed to an environment having the specific environmental temperature changes. Therefore, even if the environmental temperature is measured and correction is performed according to the environmental temperature, it is not easy to measure the body temperature of the living body robustly with a non-contact thermometer against the environmental temperature.

[0007] The present disclosure has been made in view of this problem. An object of one embodiment of the present disclosure is to provide a body temperature measuring device, a body temperature measuring method, and a body temperature measuring program that can robustly measure the body temperature of a living body without contact with the environment. [Means for solving the problem]

[0008] A body temperature measuring device according to one embodiment of the present disclosure includes an acquisition unit that acquires a temperature distribution of a body surface from the intensity of infrared rays radiated from the body surface of a living organism, a determination unit that determines a first correction based on the temperature distribution according to the progress of an increase or decrease in the temperature of the body surface due to the temperature of the environment in which the living organism is present, and a calculation unit that calculates the body temperature of the living organism by applying the first correction to the temperature of the body surface obtained from the temperature distribution.

[0009] Another embodiment of a body temperature measurement method of the present disclosure comprises the steps of: a) acquiring a temperature distribution of a body surface of a living organism from the intensity of infrared rays emitted from the body surface; b) determining a correction based on the temperature distribution in accordance with the progress of an increase or decrease in the temperature of the body surface due to the temperature of the environment in which the living organism exists; and c) calculating the body temperature of the living organism by applying the correction to the temperature of the body surface obtained from the temperature distribution.

[0010] Another embodiment of a body temperature measurement program of the present disclosure causes a computer to execute the steps of: a) accepting an input of a temperature distribution of a body surface of a living organism obtained from the intensity of infrared radiation emitted from the body surface; b) determining a correction based on the temperature distribution according to the progress of an increase or decrease in the temperature of the body surface due to the temperature of the environment in which the living organism exists; and c) calculating the body temperature of the living organism by applying the correction to the temperature of the body surface obtained from the temperature distribution. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view illustrating a schematic view of a part of a human body. [Diagram 2] 1 is a graph showing an example of the relationship between the temperature of an environment and the forehead temperature of a human body present in the environment. [Diagram 3] FIG. 1 is a diagram illustrating a schematic diagram of blood vessel distribution in the head of a human body. [Figure 4A] FIG. 13 is a diagram showing an example of a thermographic image of a face when the human body is in a normal temperature environment of 25° C. [Figure 4B] FIG. 13 is a diagram showing an example of a thermographic image of a face taken 5 seconds after the environment in which the human body is present is shifted from a normal temperature environment of 25° C. to a low temperature environment of 15° C.; [Figure 4C] FIG. 13 is a diagram showing an example of a thermographic image of a face taken 5 minutes after the environment in which the human body is present is shifted from a normal temperature environment of 25° C. to a low temperature environment of 15° C. [Diagram 5] FIG. 1 is a block diagram illustrating a body temperature measuring device according to a first embodiment. [Figure 6] FIG. 2 is a diagram illustrating a schematic diagram of data transition within the body temperature measuring device of the first embodiment. [Figure 7] 4 is a graph showing an example of the relationship between a temperature difference indicated by a temperature distribution on a body surface acquired by the body temperature measuring device of the first embodiment and a correction value used in a first correction performed by the body temperature measuring device. [Figure 8] 6 is a graph showing an example of the relationship between a second temperature calculated by the body temperature measuring device of the first embodiment and a correction value used in a second correction performed by the body temperature measuring device. [Figure 9] 4 is a graph showing an example of the relationship between a first temperature calculated by the temperature measuring device of the first embodiment and a body temperature of a living body calculated by the temperature measuring device. [Figure 10] 2 is a block diagram illustrating a schematic diagram of an acquisition unit provided in the body temperature measuring device of the first embodiment. FIG. [Figure 11A]FIG. 2 is a diagram illustrating an example of a thermography image obtained by the body temperature measuring device of the first embodiment in a low-temperature environment of 10° C. [Figure 11B] 1 is a diagram illustrating an example of a thermographic image acquired by the body temperature measuring device of the first embodiment in a normal temperature environment of 25° C. FIG. [Figure 11C] 1 is a diagram illustrating an example of a thermography image obtained by the body temperature measuring device of the first embodiment in a high temperature environment of 40° C. FIG. [Figure 12] FIG. 2 is a block diagram illustrating a computer constituting an extraction unit, a determination unit, and a calculation unit provided in the body temperature measuring device of the first embodiment. [Figure 13A] 4 is a flowchart illustrating a procedure for measuring body temperature performed by the body temperature measuring device of the first embodiment. [Figure 13B] 4 is a flowchart illustrating a procedure for measuring body temperature performed by the body temperature measuring device of the first embodiment. [Figure 14] 1 is a diagram illustrating a thermographic image acquired by the body temperature measuring device of the first embodiment and examples of a main body surface region, a first secondary body surface region, and a second secondary body surface region set in the thermographic image. FIG. [Figure 15] FIG. 11 is a block diagram illustrating a body temperature measuring device according to a second embodiment. [Figure 16] 10 is a flowchart illustrating a part of the flow of body temperature measurement performed by a body temperature measuring device of a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0013] 1. First embodiment 1.1 Increase or decrease in body surface temperature due to environmental temperature FIG. 1 is a cross-sectional view that diagrammatically illustrates a part of the human body.

[0014] 1, a blood vessel BV exists below a body surface BS of a human body HB. Blood B circulating inside the human body HB flows through the blood vessel BV.

[0015] The thermal energy generated at the center of the human body HB is called core body temperature, and is carried from the center to under the body surface BS by blood B. The thermal energy carried to under the body surface BS is released from the body surface BS.

[0016] When the temperature of the environment E in which the human body HB exists drops, heat energy is dissipated on the way by the blood B from the body center to under the body surface BS, and the temperature of the blood B flowing through the blood vessels BV under the body surface BS drops. This reduces the amount of heat energy released from the body surface BS. Also, when the temperature of the environment E drops, the body surface BS is cooled by the environment E. As a result, when the temperature of the environment E drops, the temperature of the body surface BS drops.

[0017] 2 is a graph showing an example of the relationship between the temperature of an environment and the forehead temperature of a human body in the environment, where the horizontal axis represents the temperature of the environment and the vertical axis represents the temperature of the forehead.

[0018] For example, as shown in FIG. 2, the temperature of the forehead of the human body HB decreases as the temperature of the environment E decreases.

[0019] Fig. 3 is a diagram showing a schematic diagram of the distribution of blood vessels in the head of a human body. In Fig. 3, the area marked "high" is an area with a high blood vessel density, the area marked "medium" is an area with a medium blood vessel density, and the area marked "low" is an area with a low blood vessel density.

[0020] 3, in the head H of the human body HB that may be the subject of body temperature measurement, when the face F is viewed from the front in a planar view, thick blood vessels BV are concentrated under the center of the face F, such as the nose and between the eyebrows, and blood vessels BV are sparsely present under the peripheral parts of the face F. Therefore, when the temperature of the environment E changes, the temperature of the center of the face F does not instantly reflect the temperature of the environment E, but the temperature of the peripheral parts of the face F instantly reflects the temperature of the environment E. Therefore, the temperature distribution of the face F, for example, the temperature difference between the temperature of the center of the face F and the temperature of the peripheral parts of the face F, reflects the progress of the decrease or increase in the temperature of the face F due to the temperature of the environment E.

[0021] Fig. 4A is a diagram showing an example of a thermographic image of a face when the environment in which the human body exists is a normal temperature environment of 25° C. Fig. 4B is a diagram showing an example of a thermographic image of a face five seconds after the environment in which the human body exists is shifted from a normal temperature environment of 25° C. to a low temperature environment of 15° C. Fig. 4C is a diagram showing an example of a thermographic image of a face five minutes after the environment in which the human body exists is shifted from a normal temperature environment of 25° C. to a low temperature environment of 15° C.

[0022] In these thermographic images, the closer a position in the thermographic image is to white, the higher the temperature of that position.

[0023] As shown in FIG. 4A, when the environment E in which the human body HB exists is a normal temperature environment of 25° C., the temperature of the entire area of ​​the face F is approximately uniform.

[0024] As shown in FIG. 4B, immediately after the environment E in which the human body HB exists has been shifted to a low temperature environment, the temperature of the cheeks, nose, etc., where blood vessels are sparsely present, is low.

[0025] As shown in FIG. 4C, when a long time has passed since the environment E in which the human body HB exists shifted to a low-temperature environment, the temperature of the face F other than the center portion is low.

[0026] Below, a technology is described that uses the change in temperature distribution of the body surface BS over time to estimate the degree of progress of a decrease or increase in the temperature of the body surface BS due to the temperature of the environment E, and uses the estimated degree of progress to estimate the body temperature of a living organism.

[0027] 1.2 Overview of body temperature measuring device Fig. 5 is a block diagram that illustrates the body temperature measuring device of the first embodiment. Fig. 6 is a diagram that illustrates the transition of data inside the body temperature measuring device of the first embodiment.

[0028] The body temperature measuring device 1 of the first embodiment shown in FIG. 5 estimates the body temperature BT of the living body LB from the intensity of infrared rays IR1 radiated from the body surface BS of the living body LB and infrared rays IR2 radiated from an object P other than the living body LB, and displays the estimated body temperature BT. This allows the body temperature measuring device 1 to measure the body temperature BT without contact and display the measured body temperature BT. In the first embodiment, the living body LB is a human body, and the body surface BS is the forehead. The living body LB may be a living body other than a human body, and the body surface BS may be a face other than the forehead or a body surface other than the face. In the first embodiment, the estimated body temperature BT is the sublingual temperature. The estimated body temperature may be a temperature other than the sublingual temperature. For example, the estimated body temperature BT may be the armpit temperature.

[0029] As shown in FIG. 5, the body temperature measuring device 1 includes an acquisition unit 11, a determination unit 12, a calculation unit 13, and a display unit .

[0030] The acquisition unit 11 acquires the temperature distribution TD of the body surface BS from the intensity of the infrared ray IR1. When acquiring the temperature distribution TD of the body surface BS from the intensity of the infrared ray IR1, the acquisition unit 11 uses the intensity of the infrared ray IR2.

[0031] 6, the determination unit 12 receives an input of the acquired temperature distribution TD and determines a first correction C1 from the acquired temperature distribution TD. In the first embodiment, the first correction C1 is determined by determining a correction value CV1 used in the first correction C1. The determined first correction C1 is a correction according to the progress of the rise or fall of the temperature TBS of the body surface BS due to the temperature of the environment E in which the living body LB exists.

[0032] Furthermore, the determining unit 12 obtains a temperature TBS of the body surface BS at which the first correction C1 is to be performed from the acquired temperature distribution TD.

[0033] The calculation unit 13 calculates the body temperature BT by performing the first correction C1 determined for the obtained temperature TBS of the body surface BS. This makes it possible to suppress the progress of the rise or fall of the temperature TBS of the body surface BS due to the temperature of the environment E in which the living body LB exists from affecting the calculated body temperature BT, and makes it possible to measure the body temperature BT robustly against the temperature of the environment E. For example, when the body temperature BT is measured outdoors, which is not a normal temperature environment, the calculated body temperature BT can be made approximately the same both when the living body LB is exposed to the temperature of the environment E for a long time and when the living body LB is exposed to the temperature of the environment E for only a short time.

[0034] Preferably, the calculation unit 13 performs the second correction C2 and conversion C in addition to the first correction C1 to calculate the body temperature BT. When the calculation unit 13 performs the second correction C2 and conversion C, the calculation unit 13 performs the first correction C1 on the temperature TBS of the body surface BS to calculate the second temperature T2 of the body surface BS when the increase or decrease of the temperature TBS of the body surface BS due to the temperature of the environment E is completed. The calculation unit 13 also performs the second correction C2 on the calculated second temperature T2 to calculate the first temperature T1 of the body surface BS when the living body LB is in a room temperature environment. The calculation unit 13 also performs the conversion C on the calculated first temperature T1 to calculate the body temperature BT from the first temperature T1. The room temperature environment is, for example, an environment having a specific temperature selected from a temperature range of 15°C to 25°C, and is preferably an environment having a temperature of 25°C.

[0035] FIG. 7 is a graph showing an example of the relationship between the temperature difference indicated by the body surface temperature distribution acquired by the body temperature measuring device of the first embodiment and the correction value used in the first correction performed by the body temperature measuring device.

[0036] 7, the horizontal axis represents the correction value, and the vertical axis represents the temperature difference. The temperature difference on the vertical axis is the difference in temperature between multiple positions on the body surface BS, obtained from the temperature distribution TD on the body surface BS.

[0037] The determination unit 12 determines the first correction value C1 from the temperature difference by determining the correction value CV1 from the temperature difference with reference to the relationship shown in Fig. 7. The determined correction value CV1 increases as the temperature difference increases.

[0038] The calculation unit 13 performs a first correction C1 on the temperature TBS of the body surface BS by adding the determined correction value CV1 to the temperature TBS of the body surface BS. Therefore, the first correction C1 is a correction that adds the correction value CV1 to the temperature TBS of the body surface BS.

[0039] FIG. 8 is a graph showing an example of the relationship between the second temperature calculated by the body temperature measuring device of the first embodiment and the correction value used in the second correction performed by the body temperature measuring device.

[0040] In FIG. 8, the horizontal axis represents the second temperature, and the vertical axis represents the correction value.

[0041] The calculation unit 13 determines the second correction value CV2 from the second temperature T2 by determining the correction value CV2 from the second temperature T2 with reference to the relationship shown in Fig. 8. The determined correction value CV2 becomes lower as the second temperature T2 becomes higher.

[0042] Furthermore, the calculation unit 13 performs a second correction C2 on the second temperature T2 by adding the determined correction value CV2 to the second temperature T2. Therefore, the second correction C2 is a correction that adds the correction value CV2 to the second temperature T2.

[0043] FIG. 9 is a graph showing an example of the relationship between the first temperature calculated by the temperature measuring device of the first embodiment and the body temperature of a living body calculated by the temperature measuring device.

[0044] In FIG. 9, the horizontal axis represents the first temperature, and the vertical axis represents the body temperature of the living body.

[0045] The calculation unit 13 converts the first temperature T1 with reference to the relationship shown in FIG. 9, and calculates the body temperature BT of the living organism LB from the first temperature T1.

[0046] The relationships shown in FIGS. 7, 8 and 9 are given by mathematical expressions, tables, etc.

[0047] The display unit 14 displays the calculated body temperature BT.

[0048] 1.3 Acquisition part Fig. 10 is a block diagram showing a schematic diagram of an acquisition unit provided in the body temperature measuring device of the first embodiment. Fig. 11A, Fig. 11B, and Fig. 11C are schematic diagrams showing examples of thermographic images acquired by the body temperature measuring device of the first embodiment in a low temperature environment of 10°C, a normal temperature environment of 25°C, and a high temperature environment of 40°C, respectively.

[0049] The values ​​shown in Figures 11A, 11B and 11C are the degrees Celsius (°C) of the area to which they are shown.

[0050] As shown in FIG. 10, the acquisition unit 11 includes a thermograph 21 and an extraction unit 22.

[0051] The thermograph 21 detects the intensity of infrared rays emitted from a position within the viewing angle range of the thermograph 21, and converts the detected intensity into temperature using a formula, table, or the like prestored internally. In this way, the thermograph 21 obtains a thermographic image TI showing the temperatures of multiple regions R, as shown in Figures 11A, 11B, and 11C.

[0052] The intensity of infrared rays is detected by an infrared intensity detector or the like. The infrared intensity detector is an infrared camera or the like. The infrared camera is a thermopile type infrared camera, a bolometer type infrared camera, or the like.

[0053] The extraction unit 22 extracts a region R2 having a temperature other than the temperature of the body surface BS from the multiple regions R. As a result, the extraction unit 22 acquires the temperature TE of the environment E indicated by the temperature of the region R2. The region R2 is a background region, etc. As a result, the acquisition unit 11 acquires the temperature TE of the environment E from the intensity of infrared rays IR2 emitted from an object P other than the living body LB.

[0054] Moreover, the extraction unit 22 extracts two or more regions R1 having the temperature of the body surface BS from the multiple regions R. In this way, the extraction unit 22 obtains a temperature distribution TD indicated by the temperatures of the two or more regions R1.

[0055] In the first embodiment, the temperature TE of the environment E is obtained from the temperatures of multiple regions R shown by the thermographic image TI. This makes it possible to configure the body temperature measuring device 1 using an existing device that does not have a space temperature sensor that detects the temperature TE of the environment E.

[0056] 1.4 Temperature Measurement Program FIG. 12 is a block diagram illustrating a computer that constitutes the extraction unit, the determination unit, and the calculation unit provided in the body temperature measuring device of the first embodiment.

[0057] 12 constitutes the extraction unit 22, the determination unit 12, and the calculation unit 13. The computer 31 includes a processor 41, a memory 42, and a storage 43.

[0058] The processor 41 is a central processing unit (CPU), a graphics processing unit (GPU), etc. The memory 42 is a random access memory (RAM), a read-only memory (ROM), etc. The storage 43 is a solid state drive (SSD), a hard disk drive (HDD), etc.

[0059] The body temperature measurement program 45 is installed in the storage 43. The installed body temperature measurement program 45 is loaded into the memory 42. The loaded body temperature measurement program 45 is executed by the processor 41. As a result, the body temperature measurement program 45 is executed by the computer 31, and the extraction unit 22, the determination unit 12, and the calculation unit 13 are configured.

[0060] The body temperature measurement program 45 may be installed in the storage 43 by writing data received via a network to the storage 43, or may be installed in the storage 43 by writing data read from the medium 44 to the storage 43. The medium 44 is a digital versatile disc (DVD), a compact disc (CD), a Blu-ray disc (BD), a universal serial bus (USB) memory, or the like.

[0061] The present disclosure is also directed to a body temperature measurement program 45 stored on a non-transitory recording medium readable by computer 31, such as memory 42, storage 43, medium 44, etc.

[0062] 1.5 Temperature measurement 13A and 13B are flow charts illustrating the flow of body temperature measurement performed by the body temperature measuring device of the first embodiment.

[0063] When measuring the body temperature BT, the body temperature measuring device 1 executes steps S101 to S113 illustrated in FIGS. 13A and 13B.

[0064] In step S101, the thermograph 21 determines whether or not a living body LB, the subject of which body temperature BT is to be measured, is present within the measurement range. If it is determined in step S101 that the living body LB is present within the measurement range, i.e., if the living body LB is detected, step S102 is executed. On the other hand, if it is determined in step S101 that the living body LB is not present within the measurement range, i.e., if a living body is not detected, step S101 is executed again. As a result, the body temperature measuring device 1 waits while repeatedly executing step S101 until it detects the living body LB, and executes steps S102 and onward in conjunction with the detection of the living body LB.

[0065] The thermograph 21 determines that a living body LB is present within the measurement range when the intensity of the detected infrared rays or the temperature obtained by converting the intensity of the infrared rays fluctuates by a set value or more.

[0066] In step S102, the thermographer 21 starts acquiring a thermographic image TI.

[0067] In the following step S103, the thermographer 21 acquires a thermographic image TI.

[0068] In the following step S104, the extraction unit 22 extracts two or more regions R1 having the temperature TE of the environment E and the temperature TBS of the body surface BS from the thermographic image TI.

[0069] When extracting the temperature TE of the environment E, the extraction unit 22 extracts a background region R2 other than the two or more extracted regions R1. The background region R2 is extracted from the same range as the range from which the two or more regions R1 having the temperature TBS of the body surface BS are extracted in the vertical direction of the thermographic image TI, for example, as shown in Figures 11A, 11B, and 11C.

[0070] Furthermore, the extraction unit 22 calculates the temperature TE of the environment E from the temperature of the extracted background region R2.

[0071] The calculated temperature TE of the environment E is, for example, the median temperature of the background region R2. When the thermographic images TI shown in Figures 11A, 11B, and 11C are acquired, the median temperatures of the background region R2, which are regarded as the temperature TE of the environment E, are 7.8°C, 27.3°C, and 37.1°C, respectively.

[0072] The temperature TE of the environment E may be a representative value of the temperature of the background region R2 other than the median value of the temperature of the background region R2. For example, the temperature TE of the environment E may be an average value of the temperature of the background region R2.

[0073] The temperature TE of the environment E may be a representative value of some of the temperatures included in the temperature of the background region R2. For example, the temperature TE of the environment E may be a representative value of the top 10 temperatures when the temperatures of the background region R2 are sorted in descending order.

[0074] The temperature TE of the environment E may be representative of the overall temperature of the thermographic image TI.

[0075] The temperature TE of the environment E may be extracted from a thermographic image TI acquired before the living body LB is determined to be present in the measurement range.

[0076] The two or more regions R1 may be, for example, fixed regions of interest (ROI) in the thermographic image TI. The two or more regions R1 may be regions that have a temperature difference from the temperature before it is determined that the living body LB is present in the measurement range and have a temperature equal to or higher than a threshold. The threshold may be set according to the temperature TE of the environment E. For example, when the environment E is a low temperature environment of 10°C, a normal temperature environment of 25°C, and a high temperature environment of 40°C, the thresholds are set to 25°C, 30°C, and 32°C, respectively.

[0077] An RGB camera may be provided in the body temperature measuring device 1, and facial recognition may be performed using an image captured by the RGB camera, and two or more regions R1 may be extracted based on the results of the facial recognition.

[0078] In the subsequent steps S105 to S112, the degree of progress of the rise or fall of the temperature TBS of the body surface BS due to the temperature TE of the environment E is estimated from the temperature distribution TD of the body surface BS indicated by the temperatures of two or more regions R1. Also, a first temperature T1 and a second temperature T2 reflecting the estimated degree of progress are calculated.

[0079] In step S105, the determination unit 12 extracts the main temperature and the sub-temperature of the body surface BS from the temperature distribution TD of the body surface BS indicated by the temperatures of two or more regions R1.

[0080] FIG. 14 is a diagram illustrating an example of a thermographic image acquired by the body temperature measuring device of the first embodiment and an example of a main body surface region, a first secondary body surface region, and a second secondary body surface region set in the thermographic image.

[0081] As shown in FIG. 14, when extracting the main temperature and the sub-temperature of the body surface BS, the determination unit 12 sets a main surface region MR, a first sub-surface region SR1, and a second sub-surface region SR2 in the thermography image TI. The determination unit 12 divides the forehead region included in the thermography image TI of the head into three parts in the horizontal direction to set the main surface region MR, the first sub-surface region SR1, and the second sub-surface region SR2. The main surface region MR is set in the center. The first sub-surface region SR1 is set to the left of the main surface region MR. The second sub-surface region SR2 is set to the right of the main surface region MR. The horizontal size of each of the main surface region MR, the first sub-surface region SR1, and the second sub-surface region SR2 is approximately 1 / 3 of the horizontal range of the face.

[0082] Moreover, the determination unit 12 sets the temperature of the main surface region MR to the main temperature of the body surface BS.

[0083] In addition, the determination unit 12 sets the temperature of the first secondary body surface region SR1 and the second secondary body surface region SR2, whichever is closer to the temperature of the main surface region MR, as the secondary temperature of the body surface BS. For example, if the temperature of the main surface region MR is 27.1°C, the temperature of the first secondary body surface region SR1 is 26.5°C, and the temperature of the second secondary body surface region SR2 is 26.0°C, the temperature of the first secondary body surface region SR1, which is closer to the temperature of the main surface region MR, 27.1°C, is set as the secondary temperature of the body surface BS.

[0084] In the following step S106, the determination unit 12 calculates the temperature difference between the main temperature of the body surface BS and the sub-temperature of the body surface BS.

[0085] In the following step S107, the determination unit 12 judges whether the calculated temperature difference is equal to or greater than the first threshold and equal to or less than the second threshold. If it is judged in step S107 that the temperature difference is equal to or greater than the first threshold and equal to or less than the second threshold, step S108 is executed. If it is judged in step S107 that the temperature difference is not equal to or greater than the first threshold and equal to or less than the second threshold, step S110 is executed. The first threshold is set, for example, within a range of 0°C to 0.49°C, and preferably set to 0.49°C. The second threshold is set, for example, to 1.01°C or greater, and preferably set to 1.01°C. There is a temperature difference in cases other than when the living organism LB is in a high temperature environment. This is because, in the case where the living organism LB is in a high temperature environment, for example, when the living organism LB is in a high temperature environment of 40°C, there is no temperature difference in the biological principle.

[0086] In step S108, the determination unit 12 determines the correction value CV1 to be used for the first correction C1.

[0087] In the next step S109, the calculation unit 13 performs a first correction C1 on the temperature TBS of the body surface BS to calculate a second temperature T2 of the body surface BS when the increase or decrease of the temperature TBS of the body surface BS due to the temperature of the environment E has ended. The calculation unit 13 also performs a second correction C2 on the calculated second temperature T2 to calculate a first temperature T1 of the body surface BS when the living body LB is in a room temperature environment. The temperature TBS of the body surface BS to which the first correction C1 is performed may be the main temperature of the body surface BS or an average value of the main temperature and the sub-temperature of the body surface BS.

[0088] In step S110, the calculation unit 13 determines whether the calculated temperature difference is greater than the first threshold. If it is determined in step S107 that the temperature difference is greater than the first threshold, step S111 is executed. If it is determined in step S110 that the temperature difference is not greater than the first threshold, step S112 is executed.

[0089] In step S111, which is executed when the temperature difference is greater than the first threshold value, the calculation unit 13 sets the temperature TBS of the body surface BS to a second temperature T2 that the body surface BS has when the increase or decrease in the temperature TBS of the body surface BS due to the temperature of the environment E has ended. The calculation unit 13 also performs a second correction C2 on the second temperature T2 to calculate a first temperature T1 that the body surface BS has when the living organism LB is in a normal temperature environment. The temperature TBS of the body surface BS that is set to the second temperature T2 may be the main temperature of the body surface BS, or may be an average value of the main temperature and the sub-temperature of the body surface BS.

[0090] In step S112, which is executed when the temperature difference is smaller than the second threshold value, the calculation unit 13 sets the temperature TBS of the body surface BS to a first temperature T1 that the body surface BS has when the living body LB is in a room temperature environment. The temperature TBS of the body surface BS set to the first temperature T1 is the main temperature of the body surface BS.

[0091] In step S113 following steps S109, S111 and S112, the calculation unit 13 performs conversion C on the first temperature T1 to calculate the body temperature BT of the living organism LB from the first temperature T1.

[0092] The magnitude of the temperature difference indicates the width of the temperature distribution TD on the body surface BS.

[0093] Therefore, in the case where the temperature distribution TD of the body surface BS has a first distribution range, the first correction is applied to the temperature TBS of the body surface BS to calculate the second temperature T2 by steps S107 to S113. In addition, the second correction C2 is applied to the calculated second temperature T2 to calculate the first temperature T1. In addition, the conversion C is applied to the calculated first temperature T1 to calculate the body temperature BT of the living body LB from the first temperature T1. As a result, in the case where it is estimated that the rise or fall of the temperature TBS of the body surface BS due to the temperature TE of the environment E has not yet ended, the first correction C1 and the second correction C2 are applied, and the first correction C1 according to the progress is applied.

[0094] Also, when the temperature distribution TD of the body surface BS has a second distribution range wider than the first distribution range, the temperature TBS of the body surface BS is set as the second temperature T2. Also, a second correction C2 is performed on the second temperature T2 to calculate the first temperature T1. Also, a conversion C is performed on the calculated first temperature T1 to calculate the body temperature BT of the living body LB from the first temperature T1. As a result, when the temperature distribution TD of the body surface BS has a wide distribution range and the living body LB has been exposed to the temperature TE of the environment E for a long time, and it is estimated that the progress of the rise or fall of the temperature TBS of the body surface BS due to the temperature TE of the environment E has ended, the first correction C1 is omitted, and the body temperature BT of the living body LB is calculated from the second temperature T2, which is the temperature TBS of the body surface BS, via the first temperature T1.

[0095] Furthermore, when the temperature distribution TD of the body surface BS has a third distribution range narrower than the first distribution range, the temperature TBS of the body surface BS is set to the first temperature T1. Furthermore, a conversion C is performed on the calculated first temperature T1, and the body temperature BT of the living body LB is calculated from the first temperature T1. As a result, when the temperature distribution TD of the body surface BS has a narrow distribution range and it is estimated that the influence of the temperature TE of the environment E on the temperature TBS of the body surface BS is small, the first correction C1 and the second correction C2 are omitted, and the body temperature BT of the living body LB is calculated from the first temperature T1, which is the temperature TBS of the body surface BS.

[0096] 2. Second embodiment The following describes the differences between the second embodiment and the first embodiment. For points that are not described, the second embodiment employs the same configuration as that employed in the first embodiment.

[0097] FIG. 15 is a block diagram illustrating a body temperature measuring device according to the second embodiment.

[0098] The body temperature measuring device 2 of the second embodiment shown in FIG.

[0099] The space temperature sensor 15 detects the temperature TE of the environment E.

[0100] In the second embodiment, the temperature TE of the environment E is detected by the space temperature sensor 15. This makes it possible to increase the accuracy of the acquired temperature TE of the environment E. Also, the temperature TE of the environment E can be acquired reliably.

[0101] FIG. 16 is a flowchart illustrating a part of the flow of body temperature measurement performed by the body temperature measuring device of the second embodiment.

[0102] In the second embodiment, the body temperature measuring device 2 performs steps S202 to S204 shown in FIG. 16 instead of steps S102 to S104 shown in FIG. 13A when measuring the body temperature BT.

[0103] In step S202, the space temperature sensor 15 starts detecting the temperature TE of the environment E. In addition, the thermography 21 starts acquiring a thermography image TI.

[0104] In step S203, the space temperature sensor 15 detects the temperature TE of the environment E. In addition, the thermograph 21 acquires a thermographic image TI.

[0105] In the next step S204, the extraction unit 22 extracts the temperature TE of the environment E from the result of detection by the space temperature sensor 15, and extracts two or more regions R1 having the temperature TBS of the body surface BS from the thermographic image TI.

[0106] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that has the same action and effect, or a configuration that can achieve the same purpose. [Explanation of symbols]

[0107] 1,2 Body temperature measuring device, 11 Acquisition unit, 12 Decision unit, 13 Calculation unit, 14 Display unit, 15 Space temperature sensor, 21 Thermography, 22 Extraction unit, 31 Computer, 41 Processor, 42 Memory, 43 Storage, 44 Media, 45 Body temperature measuring program, IR1, IR2 Infrared, LB Living body, E Environment, P Object, BT Body temperature, TI Thermography image, TD Temperature distribution, TBS Body surface temperature, TE Environment temperature, T1 First temperature, T2 Second temperature, C1 First correction, C2 Second correction, C Conversion, CV1 Correction value, CV2 Correction value, R, R1, R2 Multiple regions, MR Main surface region, SR1 First secondary body surface region, SR2 Second secondary body surface region

Claims

1. an acquisition unit that acquires a temperature distribution of a body surface of a living body from the intensity of infrared rays radiated from the body surface; a determination unit that determines a first correction value to be used in a first correction according to a progress of an increase or decrease in the temperature of the body surface due to a temperature of an environment in which the living body exists, based on a difference in temperature between a plurality of positions on the body surface obtained from the temperature distribution; a calculation unit that calculates a body temperature of the living body based on a result obtained by performing the first correction on the body surface temperature obtained from the temperature distribution; A body temperature measuring device comprising:

2. The calculation unit calculates a first temperature that the body surface has when the living body is in a normal temperature environment based on a result obtained by performing the first correction on the body surface temperature, and calculates the body temperature from the first temperature. The body temperature measuring device according to claim 1 .

3. The calculation unit calculates a second temperature by performing the first correction on the body surface temperature, and calculates the first temperature by performing a second correction on the second temperature. The body temperature measuring device according to claim 2 .

4. The calculation unit is When the temperature distribution has a first distribution range, the first correction is performed on the body surface temperature to calculate the second temperature, the second correction is performed on the second temperature to calculate the first temperature, and the body temperature is calculated from the first temperature; When the temperature distribution has a second distribution range wider than the first distribution range, the body surface temperature is set as the second temperature, the second temperature is corrected to calculate the first temperature, and the body temperature is calculated from the first temperature; When the temperature distribution has a third distribution range narrower than the first distribution range, the body surface temperature is set as the first temperature, and the body temperature is calculated from the first temperature. The body temperature measuring device according to claim 3.

5. the first correction is a correction of adding the first correction value to the body surface temperature obtained from the temperature distribution, The first correction value increases as the difference increases. The body temperature measuring device according to claim 1 .

6. The acquisition unit acquires the temperature of the environment from the intensity of infrared rays emitted from the non-living object.

6. The body temperature measuring device according to claim 1.

7. A space temperature sensor is provided to detect the temperature of the environment.

6. The body temperature measuring device according to claim 1.

8. The acquisition unit is a thermograph for acquiring thermographic images indicative of temperatures in a plurality of regions; An extraction unit that extracts two or more regions having the body surface temperature from the plurality of regions; Equipped with The temperature distribution is represented by the temperatures of the two or more regions.

8. The body temperature measuring device according to claim 1.

9. The extraction unit extracts an area having a temperature other than the body surface temperature from the plurality of areas, The temperature of the environment is indicated by the temperature of the area. The body temperature measuring device according to claim 8.

10. The body surface is the face.

10. The body temperature measuring device according to claim 1.

11. a) obtaining a temperature distribution of a body surface of a living body from the intensity of infrared rays emitted from the body surface; b) determining a correction value to be used for correction according to the progress of the rise or fall of the temperature of the body surface due to the temperature of the environment in which the living body exists, from the temperature difference between the temperatures at the multiple positions on the body surface obtained from the temperature distribution; c) calculating the body temperature of the living body based on the result of the correction performed on the body surface temperature obtained from the temperature distribution; A body temperature measuring method comprising:

12. a) receiving an input of a temperature distribution of a body surface of a living body obtained from the intensity of infrared rays radiated from the body surface; b) determining a correction value to be used for correction according to the progress of the rise or fall of the temperature of the body surface due to the temperature of the environment in which the living body exists, from the temperature difference between the temperatures at the multiple positions on the body surface obtained from the temperature distribution; c) calculating the body temperature of the living body based on the result of the correction performed on the body surface temperature obtained from the temperature distribution; A body temperature measurement program that causes a computer to execute the following.

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