Correction device, correction system, correction method, and correction program

Abstract

A correction device (1) includes: a calculation unit (11) that acquires the body-surface temperature of a first person staying outdoors for a predetermined period of time or more from a picture captured by a thermal camera (100) and calculates a correction value used for correcting the body-surface temperature on the basis of a measurement result of the body temperature of the first person; and a correction unit (12) that acquires the body-surface temperature of a second person other than the first person from a picture captured by the thermal camera (100) and corrects the body-surface temperature of the second person on the basis of the correction value.

Description

[Technical field]

[0001] The present invention relates to a correction device, a correction system, a correction method, and a non-transitory computer-readable medium, and more particularly to a correction device, a correction system, a correction method, and a non-transitory computer-readable medium for correcting a body surface temperature measured by a thermal camera. [Background technology]

[0002] During the COVID-19 pandemic, facilities are using thermal cameras to measure the body surface temperature of people entering the facility to screen for people with fevers. Although body surface temperature is different from body temperature, it has the advantage of being able to be measured immediately without contact.

[0003] In some cases, thermal cameras are installed near the entrances of facilities to screen people with fevers. In such cases, there is a problem that the results of body surface temperature measurements are affected by the outside temperature.

[0004] Patent Document 1 discloses a technique relating to a deep body temperature measuring device that uses thermal images to measure deep body temperature with high accuracy. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-183564 A Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, there is a problem in that the accuracy of measuring the body surface temperature decreases due to the influence of the outside air temperature. However, Patent Document 1 cannot solve this problem.

[0007] The present disclosure has been made to solve such problems, and aims to provide a correction device, a correction system, a correction method, and a non-transitory computer-readable medium that improve the measurement accuracy of body surface temperature. [Means for solving the problem]

[0008] A correction device according to a first aspect of the present disclosure includes: A calculation means for acquiring a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from an image captured by a thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; a correction means for acquiring a body surface temperature of a second person other than the first person from an image captured by a thermal camera, and correcting the body surface temperature of the second person based on the correction value; Equipped with.

[0009] A correction system according to a second aspect of the present disclosure includes: Thermal camera and A correction device; Equipped with The correction device comprises: obtaining a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from the image captured by the thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; The body surface temperature of a second person other than the first person is measured by the thermal camera, and the body surface temperature of the second person is corrected based on the correction value.

[0010] A correction method according to a third aspect of the present disclosure includes: The computer Obtaining a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from an image captured by a thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; The body surface temperature of a second person other than the first person is obtained from an image captured by a thermal camera, and the body surface temperature of the second person is corrected based on the correction value.

[0011] A non-transitory computer-readable medium having a program stored thereon according to a fourth aspect of the present disclosure includes: On the computer, A process of acquiring a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from an image captured by a thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; A process of acquiring a body surface temperature of a second person other than the first person from an image captured by a thermal camera, and correcting the body surface temperature of the second person based on the correction value; Execute the command. Effect of the Invention

[0012] The present disclosure provides a correction device, a correction system, a correction method, and a non-transitory computer-readable medium that improve the measurement accuracy of body surface temperature. [Brief description of the drawings]

[0013] [Figure 1] 1 is a block diagram showing an overall configuration of a correction device according to a first embodiment. [Diagram 2] FIG. 11 is a schematic configuration diagram of a correction system according to a second embodiment. [Diagram 3] FIG. 11 is a schematic configuration diagram showing the configuration of a correction device according to the second embodiment. [Figure 4] 10 is a schematic flowchart showing the flow of a correction method according to the second embodiment. [Diagram 5] 6 is a schematic time chart showing a flow of a correction method according to the second embodiment. [Figure 6] 13 shows an age-specific correction table generated by the correction device according to the second embodiment. [Figure 7] 13 is a schematic flowchart illustrating the flow of a correction method according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and duplicated descriptions will be omitted as necessary for clarity of explanation.

[0015] (Embodiment 1) 1 is a block diagram showing the overall configuration of a correction device 1 according to the embodiment 1. The correction device 1 is a computer that corrects the body surface temperature measured by a thermal camera so that it becomes closer to the body temperature.

[0016] The correction device 1 is connected to a network (not shown). The correction device 1 is connected to a thermal camera (not shown) via the network (not shown). The network (not shown) may be wired or wireless. The thermal camera (not shown) is installed, for example, at the entrance of a facility.

[0017] The correction device 1 includes a calculation unit 11 and a correction unit 12. The calculation unit 11 acquires the body surface temperature of a first person who stays outdoors for a predetermined time or more from an image captured by a thermal camera (not shown), and calculates a correction value used to correct the body surface temperature based on the measurement result of the first person's body temperature. The calculation unit 11 may generate a correction table that associates the correction value of the first person with the attributes of the first person. It is assumed that the attributes of the first person are identified by authentication of the first person.

[0018] The first person may be, for example, an employee (e.g., a security guard) working outdoors at a facility. The first person does not need to be outdoors all the time. The first person may be temporarily staying at the entrance of the facility when measuring the body surface temperature. Specifically, the calculation unit 11 calculates the difference between the measurement result of the body temperature and the measurement result of the body surface temperature as the correction value.

[0019] The body temperature of the first person may be acquired, for example, from a wearable thermometer (not shown) worn by the first person. Alternatively, the body temperature of the first person may be measured in a temperature-measuring booth installed in the vicinity of the facility.

[0020] The correction unit 12 acquires the body surface temperature of a second person other than the first person from an image captured by a thermal camera (not shown), and corrects the body surface temperature of the second person based on the correction value calculated by the calculation unit 11. The correction unit 12 may determine the correction value according to the attributes of the second person using the above-mentioned correction table. It is assumed that the attributes of the second person are identified by image analysis or the like. Specifically, the second person is an entrance to the facility, and may be a visitor to the facility or an employee other than the first person.

[0021] In this way, the correction device according to the present embodiment calculates a correction value for the body surface temperature according to the body surface temperature and body temperature of the first person staying outdoors. Therefore, the correction device 1 according to the present embodiment can highly accurately correct the body surface temperature of a second person other than the first person (for example, a visitor to a facility).

[0022] The correction device 1 includes a processor, a memory, and a storage device, which are not shown in the figure. The storage device stores a computer program that implements the processing of the correction method according to this embodiment. The processor then reads the computer program from the storage device into the memory and executes the computer program. In this way, the processor realizes the functions of the calculation unit 11 and the correction unit 12.

[0023] Alternatively, the calculation unit 11 and the correction unit 12 may each be realized by dedicated hardware. Also, a part or all of the components of each device may be realized by a general-purpose or dedicated circuit, processor, etc., or a combination of these. These may be configured by a single chip, or may be configured by multiple chips connected via a bus. A part or all of the components of each device may be realized by a combination of the above-mentioned circuits, etc., and a program. Also, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an FPGA (field-programmable gate array), a quantum processor (quantum computer control chip), etc. can be used as the processor.

[0024] Furthermore, when some or all of the components of the correction device 1 are realized by a plurality of information processing devices, circuits, etc., the plurality of information processing devices, circuits, etc. may be centrally arranged or distributed. For example, the information processing devices, circuits, etc. may be realized as a client-server system, a cloud computing system, etc., in a form in which each is connected via a communication network. Furthermore, the functions of the correction device 1 may be provided in a SaaS (Software as a Service) format.

[0025] (Embodiment 2) The second embodiment is a specific example of the first embodiment. Fig. 2 is a schematic diagram showing the configuration of a correction system according to the present embodiment. The correction system 1000 includes a thermal camera 100, a visible light camera 200, a display device 300, a wearable thermometer 400, and a correction device 500.

[0026] The correction system 1000 is a system that measures the body surface temperature of visitors at the entrance of a facility X (e.g., a commercial facility) and screens the visitors. Doors 10a and 10b are provided at the entrance of the facility X. Door 10a leads to the outside 20, and door 10b leads to the inside of the facility X.

[0027] At the entrance of facility X, a thermal camera 100, a visible light camera 200, and a display device 300 are provided. It is preferable that the imaging area of ​​the visible light camera 200 overlaps with that of the thermal camera 100. The thermal camera 100 and the visible light camera 200 may be configured as a single camera.

[0028] The thermal camera 100 captures footage (also referred to as thermal images) of an employee 21 of facility X and an attendant 22 (e.g., a visitor) other than the employee 21. The employee 21 corresponds to the first person described above, and the attendant 22 corresponds to the second person described above. The visible light camera 200 captures visible light images of the employee 21 and the attendant 22. The display device 300 displays the thermal image captured by the thermal camera 100. The display device 300 also displays the value of the body surface temperature corrected by a correction device 500, which will be described later. If the corrected body surface temperature is higher than a set threshold value, the display device 300 notifies the person with a fever on the screen and warns them.

[0029] An employee 21 (e.g., a security guard) of facility X is working outside 20. The employee 21 is wearing a wearable thermometer 400. The wearable thermometer 400 is preferably, for example, an earphone-type thermometer worn on the ear. This is because ear-type thermometers generally have a short temperature measurement time and sufficient accuracy. The wearable thermometer 400 transmits the measurement results to a correction device 500, which will be described later. The wearable thermometer 400 may transmit the measurement results periodically. According to this embodiment, the employee 21 does not need to measure his / her body temperature in a temperature measurement booth or the like, and the employee 21's body temperature can be monitored in real time.

[0030] It is assumed that a plurality of employees 21 work in facility X. The plurality of employees 21 include employees with different attributes (e.g., age). It is also assumed that the attributes (e.g., age) of the employees 21 are registered in advance in the correction device 500. The employees 21 move to the entrance of facility X at predetermined time intervals and measure their body surface temperature with the thermal camera 100. For example, all of the employees 21 may pass in front of the thermal camera 100 and the visible light camera 200 about once every 30 minutes.

[0031] The correction device 500 is a computer equipped with a processor, a memory, and the like. The correction device 500 is connected to the wearable thermometer 400, the thermal camera 100, the visible light camera 200, and the display device 300 via a network (not shown). The correction device 500 includes a storage device in which the ID and attributes (e.g., age) of the employee 21 are registered. The function of the correction device 500 will be described later.

[0032] Next, the function of the correction device 500 will be described in detail with reference to Fig. 3. The correction device 500 is a specific example of the above-mentioned correction device 1. The correction device 500 includes a calculation unit 510, a video analysis unit 520, and a correction unit 530.

[0033] The calculation unit 510 is a specific example of the above-mentioned calculation unit 11. The calculation unit 510 measures the body surface temperature of the employee 21 from the thermal image captured by the thermal camera 100. The calculation unit 510 then performs a process of finding the difference between the measurement result of the wearable thermometer 400 and the measurement result of the body surface temperature of the employee 21.

[0034] The calculation unit 510 also has a function of performing personal authentication of the employee 21 using a DB (Data Base) that stores biometric information of the employee 21. For example, the calculation unit 510 may have a function of detecting a face area from a visible light image and then controlling face authentication of the employee 21. The calculation unit 510 may also analyze the employee's clothing, etc. to identify the individual. Note that personal authentication of the employee 21 may be performed based on the image captured by the thermal camera 100, etc. After identifying the employee 21, the calculation unit 510 determines a correction value for the body surface temperature in consideration of attributes (e.g., age) and parameters (e.g., outside temperature, outdoor activity time, time of day).

[0035] The calculation unit 510 outputs the calculated correction value to the correction unit 530. Here, the calculation unit 510 determines a correction value for each attribute such as age, and generates a correction table. As described above, it is assumed that there are a plurality of employees 21 with different attributes.

[0036] The video analysis unit 520 analyzes the visible light image captured by the visible light camera 200 and estimates the age of the visitor 22. The age estimation is performed using a known video analysis technique. The video analysis unit 520 outputs the estimated age of the visitor 22 to the correction unit 530.

[0037] Moreover, the video analysis unit 520 analyzes the visible light image captured by the visible light camera 200, and estimates the outdoor activity time of the visitor 22. For example, it is assumed that a second visible light camera is installed in a parking lot, a bicycle parking lot, the nearest bus stop, and on a route from the nearest train station. The video analysis unit 520 captures a person with the second visible light camera and automatically registers the face. Then, when the same person appears at the entrance of the facility X, the video analysis unit 520 estimates the outdoor activity time based on the distance from the second visible light camera. Furthermore, if the facility X is a hospital or a membership-based facility, and the visitor 22 can be identified, the means of transportation (X minutes on foot / X minutes by bicycle / train / bus / car) may be linked to the individual in advance, and the outdoor activity time may be estimated by identifying the individual with the visible light camera 210 at the entrance of the facility X. In other words, the individual may be associated with the outdoor activity time.

[0038] The extent to which the age-specific correction value described below is taken into consideration is determined according to the estimated outdoor activity time. In other words, the longer the outdoor activity time, the larger the correction value is determined, and the shorter the outdoor activity time, the smaller the correction value is determined.

[0039] Furthermore, the image analysis unit 520 performs overlap detection processing and mask non-wearing detection processing, which will be described later.

[0040] The correction unit 530 is a specific example of the correction unit 12 described above. The correction unit 530 measures the body surface temperature of the visitor 22 from the thermal image captured by the thermal camera 100. The correction unit 530 corrects the body surface temperature of the visitor 22 using the correction value calculated by the calculation unit 510. Here, the age and outdoor activity time determined by the image analysis unit 520 are taken into consideration. Then, the correction unit 530 notifies (issues) an alert when the corrected body surface temperature is equal to or higher than a threshold value (e.g., 37.5°C). The alert may be displayed on a monitoring terminal 600 installed in a security room or the like. This allows a security guard to check the alert.

[0041] Next, the flow of operations of the correction system 1000 will be described with reference to FIG. 4. First, as shown in the lower left of FIG. 4, the correction system 1000 is assumed to include an identification DB 540 for identifying the employee 21 and an authentication DB 550 for recording the authentication result. The identification DB 540 and the authentication DB 550 may be included in the correction device 500 described above. The identification DB 540 stores an ID 541 for identifying the employee 21, an age 542 of the employee 21, and a feature amount 543 of the employee 21 in association with each other. In addition, the authentication DB 550 records an authentication time 551 as an authentication result. The authentication of the employee 21 may be performed by face authentication using the visible light camera 200 (A), by ear acoustic authentication using the ear-type wearable thermometer 400 (B), or by grasping the shape of the heat source using the thermal camera 100 (C).

[0042] Moreover, the correction system 1000 is assumed to have an external parameter input 700 as shown in the middle right side of Fig. 4. The correction system 1000 receives input of time 701 and temperature 702 from the outside. The temperature 702 may be measured by a thermometer or may be obtained from the Internet or the like.

[0043] First, the temperature measurement (S100) in the wearable thermometer will be described. In the temperature measurement (S100), the employee 21's temperature is measured (S101) and the employee 21's temperature is monitored (S102). The result of the temperature measurement (S101) is used to correct the body surface temperature. Based on the result of the temperature monitoring (S102), an alert is output (S103) if the employee 21 has a fever or a low temperature. This makes it possible to detect changes in the employee 21's physical condition and manage the employee 21's health.

[0044] Next, the measurement of body surface temperature by the thermal camera (S200) will be described. In measuring the body surface temperature, the body surface temperature of the employee 21 is measured (S201) and the body surface temperature of the visitor 22 is measured (S202).

[0045] Next, the analysis of visible light images by the visible light camera (S300) will be described. The entrance of facility X is suitable for screening because all visitors 22 pass through it, but there is a possibility that body surface temperature cannot be measured if people overlap. In the analysis of visible light images (S300), the ages of visitors 22 are estimated (S301), the outdoor activity time of visitors 22 is estimated (S302), overlapping people are detected (S303), people whose body surface temperature cannot be measured due to accessories or the like are detected (S304), and people not wearing masks are detected (S305).

[0046] If overlapping people is detected (S303), or if a person whose body surface temperature cannot be measured due to accessories (e.g., a cap, mask) is detected (S304), an alert is output indicating that measurement is not possible (S306). Furthermore, if a person not wearing a mask is detected (S305), an alert is output indicating that the visitor 22 is not wearing a mask (S307). Therefore, the correction system 1000 can improve the screening function for the visitor 22.

[0047] Next, the correction of body surface temperature (S400) will be described. First, the body temperature measured by the wearable thermometer 400 is compared with the body surface temperature measured by the thermal camera 100 (S401). Note that a measured body temperature that is significantly different from the employee 21's normal body temperature (for example, determined in S102) may be excluded from the analysis. Next, a correction value is calculated based on the comparison result (S402), and an age-specific correction value (also referred to as age-specific correction table 560) is determined (S403). In the age-specific correction table 560, ages and correction values ​​are stored in association with each other. Here, a correction table according to attributes other than age may be generated.

[0048] When calculating the correction value in S402, parameters such as the outdoor activity time P1 of the employee 21, the actual age P2 of the employee 21, the time period P3, and the outside temperature P4 are taken into consideration. The outdoor activity time P1 is obtained from the authentication time 551 of the authentication DB 550. The outdoor activity time P1 may be set according to, for example, the time between two adjacent authentication times 551. The actual age P2 is obtained from the age 542 of the identification DB 540 in response to successful authentication. The time period P3 and the outside temperature P4 are obtained from the external parameter input 700. The outside temperature P4 may be obtained from a thermometer or the Internet.

[0049] For example, when the outside air temperature P4 is low, as the outdoor activity time P1 increases, the body surface temperature will decrease, and the difference between the body temperature and the body surface temperature will increase. Also, when the outside air temperature P4 is high, as the outdoor activity time increases, the body surface temperature will increase, and the difference between the body temperature and the body surface temperature will decrease. Therefore, by taking the outdoor activity time P1 and the outside air temperature P4 into consideration, it may be possible to determine a more appropriate correction value.

[0050] Furthermore, regarding time period P3, it is known that body temperature in the evening is lower than body temperature in the morning by about 1° C. Therefore, by taking time period P3 into consideration, it may be possible to determine a more appropriate correction value.

[0051] Specifically, the outdoor activity time P1 and the outside air temperature P4 are used to correct the body surface temperature, and the actual age P2 is used as the age in the age-specific correction table 560. The time period P3 is used to determine the age-specific correction table for each time period (e.g., every 30 minutes).

[0052] Next, the estimated age of the visitor 22 is obtained (S404), and the estimated outdoor activity time is obtained (S405). Next, a correction value according to the estimated age is determined from the age-specific correction table 560 (S406). Here, as described above, the extent to which the age-specific correction value is taken into consideration is determined according to the estimated outdoor activity time. Next, the body surface temperature is obtained by the thermal camera 100 (S407), and the body surface temperature is determined by adding the correction value determined in S406 (S408). Finally, if the determined body surface temperature is equal to or greater than a threshold, an alert is output (S409).

[0053] It is known that the body temperature of elderly people is about 0.2°C lower than that of young people. Therefore, the appropriate correction value for body surface temperature may differ depending on age group. For example, body surface temperature is greatly affected by the outside air temperature, and may not differ significantly between elderly people and young people. In such cases, it is necessary to determine the correction value for elderly people to be lower than that for young people.

[0054] The correction system 1000 can correct the body surface temperature with high accuracy by estimating the age of the visitor 22. Of course, the attribute is not limited to age, and sex, race, etc. may also be taken into consideration.

[0055] Next, the correction method according to this embodiment will be specifically described with reference to Fig. 5. The horizontal direction represents time, with the right side representing later times. The interval between adjacent vertical lines corresponds to 10 minutes. This shows a case in which employee A, age 55, employee B, age 70, and employee C, age 35, measure their body surface temperatures at the entrance of the facility approximately every 30 minutes.

[0056] First, employee A measures his body surface temperature, and 10 minutes later employee B measures his body surface temperature, and 10 minutes later employee C measures his body temperature (S201a). Then, a correction value is calculated taking into account outdoor activity time P1, actual age P2, time period P3, and outside temperature P4 (S402a), and a correction value for each age group, that is, an age-specific correction table 560, is determined (S403a). Then, the age of the visitor 22 is estimated (S301), the outdoor activity time is estimated (S302), and the visitor's body temperature is determined by adding (or subtracting) the measured value and the correction value (S407a). In other words, the body surface temperature is corrected by the age-specific correction table 560 determined (learned) in advance (for example, 30 minutes ago).

[0057] In the next 30 minutes after S201a, the body surface temperatures of staff B, staff C, and staff A are measured every 10 minutes (S201b), and a correction value for the body surface temperatures is calculated (S402b). Here, the outdoor activity time P1 is determined by performing personal authentication. Specifically, the outdoor activity time P1 is the time elapsed since the previous authentication, and staff A's outdoor activity time P1 is determined to be 50 minutes. Then, a correction value for each age group is determined (S403b). The body surface temperature of the entrant is added (or subtracted) from the correction value to determine the body temperature of the entrant (S407b). The body temperature of employees is constantly monitored (S102).

[0058] Fig. 6 illustrates an example of an age-specific correction table 560 created in the above example. In the case of Fig. 5, a new correction value is determined every 30 minutes.

[0059] Next, the effects of the second embodiment will be described. In some cases, a thermal camera is installed near the entrance of a facility to screen people with fever. In such cases, there is a problem that the measurement results of the body surface temperature are affected by the outside temperature. That is, a person who is in a place with a low outside temperature will have a low measured body surface temperature, and a person who is in a place with a high outside temperature will have a high measured body surface temperature. In addition, it is considered that the effect of the outside temperature on the body surface temperature differs depending on the time of exposure to the outside temperature. In general, it is said that the effect of the outside temperature returns to normal in about 20 minutes.

[0060] One method to improve the accuracy of body surface temperature measurement is to input and adjust parameters such as ambient temperature and emissivity. This method has the problem that it takes time and requires skill. Furthermore, in places where the temperature environment changes greatly throughout the day, tuning may be required for each time period. Another method is to place a blackbody furnace to calibrate the thermal camera and use it as a temperature standard to stabilize the measurement. However, this method has the problem that it cannot take into account the influence of the outside temperature.

[0061] The correction system according to the second embodiment can use an appropriate correction value by taking into account the attributes of the visitor. Therefore, the correction system according to the second embodiment can correct the body temperature of the visitor with higher accuracy.

[0062] (Embodiment 3) The third embodiment is a specific example of the first embodiment. The correction system according to the third embodiment is different from the second embodiment in that it does not include a visible light camera and does not estimate the attributes of visitors. Even in such a case, the correction system can correct the body surface temperature of the visitor based on the body temperature of the employee.

[0063] Fig. 7 is a flowchart showing the operation of the correction system according to the third embodiment. The processes of measuring body temperature by a wearable thermometer (S100) and measuring body surface temperature by a thermal camera (S200) are the same as those in the second embodiment (Fig. 4), and therefore their explanations are omitted. The configuration of the external parameter input 700 is also the same as that in the second embodiment (Fig. 4), and therefore their explanations are omitted. Fig. 7 does not include the image analysis by a visible light camera (S300) in the second embodiment (Fig. 4).

[0064] The correction system according to the third embodiment includes a classification DB 540a. In the classification DB 540a, ID 541 and age 542 are stored in association with each other, and it is not necessary to store feature amount 543 as in the classification DB 540 of FIG.

[0065] Employee 21 is identified by method (A) using a manual individual switch, or by manual registration by visual confirmation (B). In method (A), for example, a switch is provided at the entrance of facility X, and employee 21 inputs his / her own ID 541, etc. In method (B), for example, another employee visually confirms employee 21, etc., whose body surface temperature is to be measured, and inputs ID 541, etc.

[0066] Also, comparing Figure 4 with Figure 7, body surface temperature correction (S400) has been replaced with body surface temperature correction (S400a). In Figure 4, a correction value was calculated from the measurement results of each employee 21 (S402), and an age-specific correction table 560 was determined. On the other hand, in Figure 7, a correction value that can be applied to visitors of all ages is determined from the measurement results of the employee 21 (S410).

[0067] Here, similarly to the second embodiment, parameters such as outdoor activity time P1, actual age P2, time period P3, and outside air temperature P4 are taken into consideration. The actual age P2 of the employee 21 is acquired from the identification DB 540a. Furthermore, the processes of S406 to S409 of the body surface temperature correction (S400) are similar to those of the second embodiment, and therefore will not be described.

[0068] The correction system according to the present embodiment can highly accurately correct the body temperature of visitors by using a correction value based on the body temperature of employees. Here, the correction system according to the present embodiment does not require a visible light camera, so the introduction cost can be reduced. In addition, the correction system according to the present embodiment can take into consideration the privacy of visitors because it does not perform image analysis using a visible light camera.

[0069] In the above examples, the program includes instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The program may be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, the computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray® disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, the transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0070] The present disclosure is not limited to the above-described embodiment, and may be modified as appropriate without departing from the spirit and scope of the present disclosure. In addition, the present disclosure may be implemented by appropriately combining the respective embodiments.

[0071] Although the present invention has been described above with reference to the embodiment, the present invention is not limited to the above embodiment. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. [Explanation of symbols]

[0072] 1 Correction device 11 Calculation section 12 Correction section 100 Thermal Camera 200 Visible Light Camera 300 display device 400 Wearable Thermometer 500 Corrector 510 Calculation Unit 520 Video Analysis Department 530 Correction Unit 540, 540a identification DB 541 ID 542 Age 543 Features 550 Authentication DB 551 Authentication Time 560 Age-specific correction table 600 Monitoring terminal 700 External parameter input 701 Time 702 Temperature 10a, 10b Doors 20 Outdoors 21 employees

Claims

1. a calculation means for acquiring a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from an image captured by a thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; a correction means for acquiring a body surface temperature of a second person other than the first person from an image captured by a thermal camera, and correcting the body surface temperature of the second person based on the correction value; A correction device comprising:

2. the first person is wearing a wearable thermometer; The calculation means is Calculating a correction value used to correct the body surface temperature based on the measurement result of the wearable thermometer; The correction device according to claim 1 .

3. The calculation means is generating a correction table in which a correction value of the body surface temperature of the first person is associated with an attribute of the first person; 3. A correction device according to claim 1 or 2.

4. The correction device comprises: an estimation means for estimating attributes of the second person based on an image captured by a visible light camera; Further equipped with The correction means is determining a correction value according to an attribute of the second person using the correction table; correcting the body surface temperature of the second person based on the determined correction value; The correction device according to claim 3 .

5. The attribute is age.

5. A correction device according to claim 3 or 4.

6. The first person is an employee of a facility and the second person is a visitor to the facility. The correction device according to any one of claims 1 to 5.

7. Thermal camera and A correction device; Equipped with The correction device comprises: obtaining a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from the image captured by the thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; acquiring a body surface temperature of a second person other than the first person from the image captured by the thermal camera, and correcting the body surface temperature of the second person based on the correction value; Compensation system.

8. The correction system comprises: a wearable thermometer worn by the first person; The correction device comprises: Calculating a correction value used to correct the body surface temperature based on the measurement result of the wearable thermometer; The compensation system of claim 7.

9. The computer obtaining a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from an image captured by a thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; acquiring a body surface temperature of a second person other than the first person from an image captured by a thermal camera, and correcting the body surface temperature of the second person based on the correction value; Correction method.

10. On the computer, A process of acquiring a body surface temperature of a first person who stays outdoors for a predetermined period of time or more from an image captured by a thermal camera, and calculating a correction value used to correct the body surface temperature based on the measurement result of the body temperature of the first person; A process of acquiring a body surface temperature of a second person other than the first person from an image captured by a thermal camera, and correcting the body surface temperature of the second person based on the correction value; A correction program that executes the above.

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