KR20220141976A - Apparatus and method for measuring temperature using thermal imaging camera - Google Patents

Abstract

The present invention relates to a temperature measurement apparatus using a thermal imaging camera and a method thereof. The temperature measurement apparatus of the present invention measures a body temperature of a subject and a temperature of a surrounding environment where the subject is located by using a thermal imaging camera. The temperature measurement apparatus measures a distance between the thermal imaging camera and the subject using a distance sensor. The temperature measurement apparatus calculates a deviation by comparing the measured distance and the temperature of the surrounding environment with a reference distance and a reference temperature, respectively, and corrects the body temperature measured by the thermal imaging camera according to the calculated deviation to obtain an accurate body temperature of the subject. According to the present invention, the accurate body temperature of the subject is measured by reflecting the distance to the subject and the temperature of the surrounding environment where the subject is located, to improve the accuracy and reliability of the temperature measurement apparatus.

Description

Temperature measuring device and method using thermal imaging camera

The present invention relates to a temperature measuring device, and more specifically, in order to accurately measure a subject's body temperature using a non-contact method, a thermal imaging camera is used to measure the subject's body temperature and the temperature of the surrounding environment where the subject is located, and the distance A temperature measuring device and method using a thermal imaging camera that measures the distance between a thermal imaging camera and a subject through a measuring instrument and corrects the measured body temperature according to the deviation between the reference distance and the reference temperature to measure the exact body temperature of the subject will be.

Recently, as various diseases occur frequently due to environmental factors such as global warming, the need for a temperature measuring device that can remotely measure a person's body temperature in a place with a large floating population and quickly restrict or isolate access is increasingly emerging. is becoming

In general, when a disease occurs, the local government or local government places a field agent in a place with a large floating population and measures the body temperature of a person with a thermometer in most cases. This is because the field agent directly faces the body temperature measurement target and measures the body temperature, so if the body temperature measurement target has a disease, there is a fatal problem that it can be transmitted to the field agent.

In order to solve this problem, recently, a method of measuring a person's body temperature using a thermal imaging camera has been applied. However, since this method simply displays the heat distribution obtained through the thermal imaging camera, it accurately measures the human body temperature. There is a problem that cannot be done.

Recently, various infectious diseases transmitted through humans or livestock have appeared, such as novel coronavirus (COVID-19), Middle East Respiratory Syndrome (MERS), severe acute respiratory syndrome (SARS), and avian influenza (AI). Accordingly, various studies on the prevention system for preventing the spread of infectious diseases are being conducted.

These infectious diseases are expressed in various ways depending on the type, but since they cause high fever as the most common symptom of infection, after installing a thermal imaging camera at the entrance of multi-use facilities such as airports, various buildings, government offices, hospitals, and restaurants, A temperature measuring device of a method of detecting a fever among people entering through a thermal image obtained by a thermal imaging camera is being introduced.

Such a temperature measuring device measures body temperature by, for example, displaying the subject to be positioned at a position in front of the temperature measuring device at a certain distance away from the temperature measuring device so as to focus on the thermal imaging camera, or moving the subject back and forth to focus on the thermal imaging camera When the subject is stopped in an appropriate position by guiding them to do so, the body temperature is measured.

In general, a temperature measuring device using a thermal imaging camera is often judged as a malfunction because the measured body temperature varies depending on the distance from the subject. To compensate for this, a standard temperature is set by placing a heating element or a virtual black body with a reference temperature at a specified distance, and the measured body temperature when the subject passes the heating element or virtual black body is compared with the standard temperature to determine whether it is normal or not. Alternatively, the measured body temperature is compared and calculated with the normal body temperature, and the corrected estimated value is displayed as the measured body temperature.

However, such a temperature measuring device provides inconvenience to the subject when measuring body temperature, and regardless of the distance from the subject or the temperature of the surrounding environment, since the fever is determined through the thermal image obtained by the thermal imaging camera, the measured body temperature is not affected. There is a problem in that the accuracy and reliability of the data are lowered.

Korean Patent Publication No. 10-2134903 (published on July 17, 2020) Korean Patent Publication No. 10-2135633 (published on August 26, 2020) Korean Patent Publication No. 10-2011-0031562 (published on March 29, 2011) Korean Patent Publication No. 10-2020-0066918 (published on June 11, 2020)

An object of the present invention is to provide a temperature measuring apparatus and method using a thermal imaging camera for accurately measuring the body temperature of at least one subject in a non-contact manner.

Another object of the present invention is to provide a temperature measuring apparatus and method using a thermal imaging camera for calculating and displaying an accurate temperature by correcting the measured body temperature according to the distance from the subject and the environmental temperature of the installation place.

In order to achieve the above objects, the temperature measuring device of the present invention measures the body temperature of at least one subject and the ambient environment temperature in which the subject is located using a thermal imaging camera, and a distance between the thermal imaging camera and the subject using a distance measuring device One feature is that it corrects the measured body temperature according to the measured distance and the surrounding environment temperature. The temperature measuring device of the present invention as described above makes it possible to accurately measure the body temperature of a subject in a non-connected manner.

The temperature measuring apparatus of the present invention according to this feature includes: a thermal imaging camera for recognizing at least one subject using an infrared sensor, and measuring the recognized subject's body temperature and ambient environment temperature in which the subject is located; a distance measuring device for measuring the distance between the thermal imaging camera and the subject; a display unit for displaying the subject's body temperature and surrounding environment temperature; an alarm unit for generating an alarm to the outside; and controlling to measure the subject's body temperature, surrounding environment temperature and distance from the thermal imaging camera and the distance measuring device, and comparing the distance measured by the distance measuring device with a set reference distance to determine the measured body temperature according to the distance deviation Compensating, comparing the ambient environment temperature measured by the thermal imaging camera with a set reference temperature to compensate the primary corrected body temperature according to the temperature deviation, and control to display the secondary corrected body temperature on the display unit, When the corrected body temperature is equal to or greater than the reference body temperature, at least a control unit for generating an alarm through the alarm unit.

In this feature, the control unit, the object recognition unit for recognizing at least one subject from the thermal imaging camera; a body temperature determination unit for determining the body temperature of the subject recognized by the object recognition unit; a distance determining unit configured to measure the distance to the subject recognized by the object recognition unit through the distance measuring device, and to calculate a deviation by comparing the measured distance with a set reference distance; a temperature determination unit configured to measure the ambient environment temperature by the thermal imaging camera and to calculate a deviation by comparing the detected ambient environment temperature with a set reference temperature; Body temperature for calculating the subject's body temperature by correcting the subject's body temperature determined by the body temperature determining unit in response to the deviations calculated from each of the distance determining unit and the temperature determining unit, and outputting the calculated body temperature to the display unit correction unit; and an alarm generating unit configured to generate an alarm through at least one of the display unit and the alarm unit when the subject is determined to be in a fever state by determining whether the body temperature corrected by the body temperature correction unit is equal to or greater than the reference body temperature.

In this feature, when the thermal imaging camera recognizes a plurality of subjects and measures the body temperature of each of the subjects, the distance between the thermal imaging camera and each of the plurality of subjects is sequentially or randomly measured by the distance meter Controlled to be measured, and the measured body temperature of each subject is individually corrected according to the distance from each subject.

As described above, the temperature measuring apparatus of the present invention minimizes errors due to environmental factors of the subject by correcting the subject's body temperature measured using a thermal imaging camera according to the distance to the subject and the subject's ambient temperature. In this way, it is possible to measure the exact body temperature of the subject.

In addition, the temperature measuring device of the present invention can improve the accuracy and reliability of the product by measuring the exact body temperature of the subject by reflecting the distance between the thermal imaging camera and the subject and the temperature of the surrounding environment where the subject is located.

1 is a block diagram showing the configuration of a temperature measuring device using a thermal imaging camera according to the present invention;
Figure 2 is a block diagram showing the configuration of the control unit shown in Figure 1, and
3 is a flowchart illustrating a processing procedure for accurate temperature measurement of a temperature measuring apparatus using a thermal imaging camera according to the present invention.

Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited by the embodiments described below. This example is provided to more completely explain the present invention to those of ordinary skill in the art. Accordingly, the shapes of the components in the drawings are exaggerated in order to emphasize a clearer description.

The temperature measuring apparatus according to the present invention measures the body temperature of at least one subject and the ambient environment temperature in which the subject is located by using a thermal imaging camera. The temperature measuring apparatus according to the present invention measures a distance between a thermal imaging camera and subjects using a distance measuring device. The temperature measuring device according to the present invention corrects the measured body temperature in response to the measured distance and the surrounding environment temperature to calculate and display the accurate body temperature of the subject.

Therefore, the temperature measuring apparatus of the present invention can measure the exact body temperature of the subject by reflecting the distance between the thermal imaging camera and the subject and the ambient temperature in which the subject is located.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3 attached thereto.

1 is a block diagram illustrating a configuration of a temperature measuring apparatus using a thermal imaging camera according to the present invention, and FIG. 2 is a block diagram illustrating the configuration of a control unit shown in FIG. 1 .

1 and 2 , the temperature measuring apparatus 100 of the present invention uses a thermal imaging camera 112 to accurately measure a subject's body temperature and at least one subject's body temperature and the ambient temperature in which the subject is located. measures the distance between the thermal imaging camera 112 and the subject using the distance measuring device 114, and corrects the measured body temperature according to the measured distance and the ambient temperature to calculate and display the exact body temperature of the subject .

The temperature measuring device 100 of the present invention is installed at the entrance of a multi-use facility, for example, an airport, various buildings, government offices, hospitals, restaurants, etc. Measure the subject's body temperature. Such a temperature measuring device may be provided in various forms such as, for example, a stand type, an attachment type, a tabletop type, and the like.

To this end, the temperature measuring apparatus 100 of the present invention includes a thermal imaging camera 112 , a distance measuring device 114 , a display unit 122 , an alarm unit 124 , a communication unit 126 , a storage unit 128 and a control unit 130 . includes In an embodiment of the present invention, the thermal imaging camera 112 and the distance measuring device 114 are provided as one measurement module 110 , and a display unit 122 , an alarm unit 124 , a communication unit 126 , and a storage unit 128 . ) and the control unit 130 are provided as a control module 120 , and the measurement module 110 and the control module 120 are connected through a wired network such as a cable.

Specifically, the thermal imaging camera 112 measures the body temperature of at least one subject positioned in front and the ambient environment temperature in which the subject is positioned by having a shooting range of a certain angle. The thermal imaging camera 112 detects thermal radiation emitted from each of the at least one subject using, for example, an infrared sensor, visualizes the detected body temperature in various colors through thermal resolution, and outputs it to the display unit 122 . The thermal imaging camera 112 detects and displays the body temperature of each subject when the plurality of subjects are in different positions. At this time, when the subject is recognized and the body temperature is measured, the thermal imaging camera 112 receives the control of the controller 130 to detect the ambient environment temperature for a specific location, for example, the subject at the closest position or the subject located at a set reference distance. Measure the ambient temperature as a reference.

The distance meter 114 measures a distance between the thermal imaging camera 112 and the subjects. The range finder 114 is, for example, provided as an integrated module with the thermal imaging camera 112 and is configured to have the same sensing surface. When a plurality of subjects are recognized through the thermal imaging camera 112 , the distance measuring device 114 measures the distance to each of the subjects sequentially or randomly from one side to the other under the control of the controller 130 . .

The display unit 122 is provided with, for example, a touch panel, an LED display panel, an OLED display panel, etc., and displays the body temperature of the subject and the subject recognized by the thermal imaging camera 112 and the ambient environment temperature of the position where the subject is recognized do. The display unit 122 may further display the distance to the subject measured by the distance measurer 114 . When the measured and corrected body temperature of the subject is determined as a fever state, the display unit 122 displays an alarm message and the like. In addition, when the display unit 122 is provided as a touch panel, various pieces of information stored in the storage unit 128 , for example, a reference distance, a reference temperature, a reference body temperature, etc. may be set. Of course, the display unit 122 displays various interface screens according to the process of processing the function of the temperature measuring device 100 .

The alarm unit 124 is provided with, for example, a speaker and outputs an alarm sound, a voice guidance message, etc. to the outside when the measured body temperature of the subject is determined to be higher than or equal to the reference body temperature.

The communication unit 126 is, for example, connected to a wired/wireless communication network, etc. to connect the temperature measuring device 100 to, for example, a manager's smart phone, a personal computer, or an electronic device such as an access management server for controlling access to a corresponding facility. (not shown) is connected so that mutual data communication is established.

The storage unit 128 stores reference distance information for setting a reference distance between the thermal imaging camera and the subject, reference temperature information for setting a reference temperature for the surrounding environment temperature, and reference body temperature information for determining the fever state of the subject do. The storage unit 128 stores a control program for processing the function of the temperature measuring device 100 , a temperature correction algorithm, and the like. Here, the reference distance may be set differently depending on the type or performance of the infrared sensor of the thermal imaging camera 112, and the reference temperature is for each time zone such as morning, afternoon, and night, for each season such as winter and summer, indoor, outdoor, etc. It can be set differently depending on the installation location. In addition, the reference body temperature is set as the average normal body temperature of a general person (around 36.5 ° C.). In this case, each of the reference distance, the reference temperature, and the reference body temperature is set within a range having an allowable error.

And the control unit 130 controls the overall operation of the temperature measuring apparatus 100 to be processed. That is, the control unit 130 controls each function of the thermal imaging camera 112 , the distance measurer 114 , the display unit 122 , the alarm unit 124 , the communication unit 126 and the storage unit 128 to organically process each other. control

Specifically, the controller 130 corrects the subject's body temperature measured by the thermal imaging camera 112 in response to the distance between the thermal imaging camera 112 and the subject and the surrounding environment temperature, and displays the corrected subject's body temperature. control To this end, the controller 130 recognizes at least one subject through the thermal imaging camera 112 and controls to measure the subject's body temperature and ambient environment temperature, and measures the distance to each subject through the distance meter 114 . control to do At this time, when the thermal imaging camera 112 recognizes the plurality of subjects and the body temperature of each of the subjects is measured, the controller 130 uses the distance measuring device 114 to measure the distance between the thermal imaging camera 112 and each of the plurality of subjects. is controlled to measure sequentially or randomly.

The controller 130 compares, analyzes, and determines the measured body temperature to the reference distance and the reference temperature, corrects the measured body temperature according to the deviation, and controls to display the corrected body temperature. At this time, when there are a plurality of subjects, the controller 130 individually corrects the measured body temperature of each of the subjects.

When it is determined whether the corrected body temperature is in a fever state, that is, the corrected body temperature is higher than the reference body temperature, the controller 130 generates an external alarm.

As shown in FIG. 2 , the controller 130 of this embodiment includes an object recognition unit 132 , a body temperature determination unit 134 , a distance determination unit 136 , a temperature determination unit 138 , and a body temperature correcting unit 140 . and at least an alarm generating unit 142 . The control unit 130 is provided with an algorithm and a control program for determining the body temperature by object recognition and image processing, and correcting the determined body temperature.

The object recognition unit 132 recognizes at least one target detected by the thermal imaging camera 112 . The body temperature determination unit 134 determines the body temperature of each of the subjects recognized by the object recognition unit 132 . The distance determination unit 136 measures the distance to each of the subjects recognized by the object recognition unit 132 through the distance measurer 114 , and calculates a deviation by comparing the measured distance with a set reference distance. The temperature determination unit 138 measures the ambient environment temperature sensed by the thermal imaging camera 112 and calculates a deviation by comparing the detected ambient environment temperature with a set reference temperature. The body temperature correcting unit 140 corrects the subject's body temperature determined by the body temperature determining unit 134 in response to each of the deviations calculated from the distance determining unit 136 and the temperature determining unit 138, and correcting the subject's accurate body temperature. , and output the calculated body temperature to the display unit 122 . And the alarm generator 142 determines whether the body temperature corrected by the body temperature correction unit 140 is above the reference body temperature, that is, whether the subject is in a fever state, and when it is determined that the body temperature is in a fever state, the display unit 122 and/or the alarm unit 124 ) to generate an alarm.

Here, the reference distance may be set differently according to the type or performance of the infrared sensor of the thermal imaging camera 112 . In addition, the reference temperature may be set differently according to time zones such as morning, afternoon, and night, seasons such as winter and summer, and installation locations such as indoors and outdoors. In addition, the reference body temperature is set as the average normal body temperature of a general person (around 36.5 ° C.).

Therefore, the controller 130, for example, when the reference distance is set to 1 m, the reference temperature is set to 24 ~ 28 ℃, and the normal body temperature is set to 36 ~ 38 ℃, the thermal imaging camera 112 is within the reference distance Alternatively, when the body temperature measured from a subject located other than the reference distance is measured above or below normal body temperature, a distance deviation is calculated by comparing the distance to the subject with the reference distance. In addition, when the measured ambient temperature is higher or lower than the reference temperature, the controller 130 compares the measured ambient temperature with the reference temperature to calculate a temperature deviation. For example, if the measured distance is 2m, the measured body temperature is 33℃, and the ambient temperature is -10℃, corresponding to 1m, which is a deviation from the reference distance, and 34 to 38℃, which is a deviation of the ambient temperature, respectively. The body temperature measured by correction can be calculated as the actual body temperature of the subject, 36°C.

Accordingly, the controller 130 firstly corrects the body temperature measured by the thermal imaging camera 112 according to the distance deviation, and secondarily corrects the firstly corrected body temperature according to the temperature deviation.

As described above, the temperature measuring device 100 of the present invention reflects the distance to the subject and the ambient temperature in which the subject is located in the measured body temperature of the subject using the thermal imaging camera 112 and the distance meter 114 . to measure the exact body temperature of the subject.

And FIG. 3 is a flowchart illustrating a processing procedure for accurate temperature measurement of a temperature measuring apparatus using a thermal imaging camera according to the present invention. This procedure is a computer program processed by the control unit 130 of the temperature measuring device 100 of the present invention, and the computer program is stored in the control unit 130 or the storage unit 128 .

Referring to FIG. 3 , the temperature measuring apparatus 100 of the present invention recognizes at least one subject using the thermal imaging camera 112 in step S200 and measures the subject's body temperature and the ambient environment temperature of the place where the subject is located. do. In step S210, the distance between the thermal imaging camera 112 and the recognized subject is measured using the distance meter 114. At this time, when there are a plurality of subjects recognized by the thermal imaging camera 112 , the distance measurer 114 may measure the distances of each of the subjects sequentially or randomly.

In step S220, the temperature measuring apparatus 100 corrects the measured body temperature as a primary temperature according to the distance, and in step S230, corrects the first corrected body temperature as a secondary temperature according to the ambient temperature.

In step S240, the temperature measuring apparatus 100 displays the corrected body temperature on the display unit 122, and in step S250, the corrected body temperature is greater than or equal to the reference body temperature, that is, it is determined whether the subject of the corrected body temperature is in a fever state. Subsequently, when it is determined that the reference body temperature is higher than the reference body temperature in step S260 , an alarm is generated by the display unit 122 and the alarm unit 124 .

In the above, the configuration and operation of the temperature measuring device and the method using the thermal imaging camera according to the present invention have been illustrated according to the detailed description and drawings, but this is merely described by way of example and does not depart from the technical spirit of the present invention. Various changes and modifications are possible within the scope.

100: temperature measuring device
110: measurement module
112: thermal imaging camera
114: distance finder
120: control module
122: display unit
124: alarm unit
126: communication department
128: storage
130: control unit

Claims (3)

A temperature measuring device comprising:
a thermal imaging camera for recognizing at least one subject using an infrared sensor and measuring the recognized subject's body temperature and ambient temperature in which the subject is located;
a distance measuring device for measuring the distance between the thermal imaging camera and the subject;
a display unit for displaying the subject's body temperature and surrounding environment temperature;
an alarm unit for generating an alarm to the outside; and
Control to measure the subject's body temperature, ambient temperature and distance from the thermal imaging camera and the distance measuring device, and comparing the distance measured by the distance measuring device with a set reference distance to first correct the measured body temperature according to the distance deviation And, by comparing the ambient environment temperature measured by the thermal imaging camera with the set reference temperature, the primary corrected body temperature according to the temperature deviation is corrected secondary, and the display unit controls to display the secondary corrected body temperature. and a control unit for generating an alarm through at least the alarm unit when the measured body temperature is equal to or greater than the reference body temperature.
The method according to claim 1,
The control unit is
an object recognition unit for recognizing at least one subject from the thermal imaging camera;
a body temperature determination unit for determining the body temperature of the subject recognized by the object recognition unit;
a distance determining unit configured to measure the distance to the subject recognized by the object recognition unit through the distance measuring device, and to calculate a deviation by comparing the measured distance with a set reference distance;
a temperature determination unit configured to measure the ambient environment temperature by the thermal imaging camera and to calculate a deviation by comparing the detected ambient environment temperature with a set reference temperature;
Body temperature for calculating the subject's body temperature by correcting the subject's body temperature determined by the body temperature determining unit in response to the deviations calculated from each of the distance determining unit and the temperature determining unit, and outputting the calculated body temperature to the display unit correction unit; and
and at least an alarm generating unit configured to generate an alarm through at least one of the display unit and the alarm unit when the subject is determined to be in a fever state by determining whether the body temperature corrected by the body temperature correction unit is higher than or equal to the reference body temperature. .
The method according to claim 1 or 2,
The control unit is
When the thermal imaging camera recognizes a plurality of subjects and measures the body temperature of each of the subjects, the distance meter is controlled to sequentially or randomly measure the distance between the thermal imaging camera and each of the plurality of subjects, A temperature measuring device, characterized in that the measured body temperature is individually corrected according to the distance from each of the subjects.

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