CN111964790A - Temperature calibration method and infrared temperature measuring device - Google Patents
Temperature calibration method and infrared temperature measuring device Download PDFInfo
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- 230000036760 body temperature Effects 0.000 claims abstract description 56
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- 238000009529 body temperature measurement Methods 0.000 claims description 141
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- 229910052753 mercury Inorganic materials 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
- G01J5/0025—Living bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/143—Sensing or illuminating at different wavelengths
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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- G06V40/168—Feature extraction; Face representation
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
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Abstract
The invention discloses a temperature calibration method. In the scheme, because the distance between the temperature measurer and the infrared temperature measuring device has a certain relation with the pupil distance of the temperature measurer, when the distance between the temperature measurer and the infrared temperature measuring device is close, the pupil distance of the temperature measurer is large; when the distance between the temperature measurer and the infrared temperature measuring device is far, the pupil distance of the temperature measurer is small. Therefore, the method and the device provided by the invention take the influence of the distance between the temperature measurer and the temperature measuring device on the temperature measuring result into consideration, calibrate the body temperature measuring value of the current temperature measurer based on the pupil distance parameter, and have higher precision. The invention also discloses an infrared temperature measuring device which has the same beneficial effects as the temperature calibration method.
Description
Technical Field
The invention relates to the technical field of infrared temperature measurement, in particular to a temperature calibration method and an infrared temperature measurement device.
Background
With the development of science and technology, the traditional contact type body temperature measurement mode is gradually eliminated due to the defects of larger error, lower efficiency, easy personnel gathering, cross infection and the like, and is replaced by an infrared temperature measurement device based on an infrared temperature measurement technology. Although the infrared temperature measuring device realizes the intelligent measurement of the body temperature, the infrared temperature measuring device is also easily influenced by various factors to cause the existence of temperature measuring errors, and therefore, the infrared temperature measuring device needs to be calibrated in series so as to reduce the temperature measuring errors caused by various factors and improve the temperature measuring precision.
In the prior art, two constant temperature calibrations are usually performed based on a temperature calibration module. Performing preliminary calibration on each thermal imaging point on the thermopile infrared sensor through a preliminary calibration module to obtain preliminary calibration data of each thermal imaging point; and during the period of measuring the temperature of the person to be measured, carrying out secondary calibration on the thermopile infrared sensor to obtain secondary calibration data of the thermopile infrared sensor, and obtaining the actual temperature data of the person to be measured through the two-time calibration. However, the method does not take the influence of the distance between the temperature measurer and the temperature measuring device on the temperature measuring result into consideration.
Disclosure of Invention
The invention aims to provide a temperature calibration method and an infrared temperature measuring device, which take the influence of the distance between a temperature measurer and the temperature measuring device on a temperature measuring result into consideration, calibrate the human body temperature measuring value of the temperature measurer based on the pupil distance parameter and have higher precision.
In order to solve the above technical problem, the present invention provides a temperature calibration method, including:
acquiring pupil distance parameters and a first human body temperature standard value of a temperature measurer when the temperature measurer is at different distances from the infrared temperature measuring device, and acquiring a first human body temperature measured value of the temperature measurer through the infrared temperature measuring device;
establishing a first mapping relation between a first difference value of the first human body temperature measurement value and the first human body temperature standard value and the pupil distance parameter;
acquiring a current pupil distance parameter of a person to be subjected to temperature measurement and obtaining a first current human body temperature measurement value of the person to be subjected to temperature measurement through the infrared temperature measurement device;
calibrating the first current body temperature measurement value based on the current interpupillary distance parameter and the first mapping relationship.
Preferably, obtaining a first human body temperature measurement value of the temperature measurer through the infrared temperature measuring device includes:
acquiring a visible light image and an infrared image of a temperature measurer, which are acquired by the infrared temperature measuring device, and performing face recognition on the visible light image to obtain a face area;
carrying out face key point positioning on the visible light image to obtain a face key point external region;
amplifying the external area of the face key point, and taking the smaller of the face area and the amplified external area of the face key point as a face frame area on the visible light image;
mapping the face frame area to the infrared image to obtain an infrared face area;
acquiring first initial temperature data corresponding to the infrared face area, and determining the first human body temperature measurement value based on the first initial temperature data.
Preferably, the pupil distance parameter of the temperature measurer when the temperature measurer is at different distances from the infrared temperature measuring device is acquired, including:
acquiring visible light images of the temperature measurer, which are acquired by the infrared temperature measuring device when the temperature measurer is at different distances from the infrared temperature measuring device;
carrying out face key point positioning on the visible light image of the temperature measurer to obtain face key point coordinates;
the face key points comprise central points of left and right eyes;
and taking a straight-line distance parameter between two central points of the left eye and the right eye as the pupil distance parameter.
Preferably, obtaining a first human body temperature standard value of the temperature measurer comprises:
and acquiring the first human body temperature standard value through a mercury thermometer.
Preferably, calibrating the first current body temperature measurement value based on the current interpupillary distance parameter and the first mapping relationship comprises:
determining a first current difference value between the first current human body temperature measurement value and a first human body temperature standard value corresponding to the first current human body temperature measurement value based on the current pupil distance parameter and the first mapping relation;
and adding the first current difference value and the first current human body temperature measurement value to obtain a first current human body temperature standard value.
Preferably, before calibrating the first current body temperature measurement value based on the current interpupillary distance parameter and the first mapping relationship, the method further comprises:
acquiring the temperature of a black body;
acquiring initial temperature data of the black body through the infrared temperature measuring device;
recording the difference value of the temperature of the black body and the initial temperature data of the black body as a second difference value, and adding the first current human body temperature measurement value and the second difference value to obtain a second current human body temperature measurement value;
calibrating the first current human body temperature measurement based on the current interpupillary distance parameter and the first mapping relationship, comprising:
and calibrating the second current human body temperature measurement value based on the current interpupillary distance parameter and the first mapping relation.
Preferably, before calibrating the first current body temperature measurement value based on the current interpupillary distance parameter and the first mapping relationship, the method further comprises:
acquiring second human body temperature standard values of the temperature measurer at different environmental temperatures and obtaining a second human body temperature measured value of the temperature measurer through the infrared temperature measuring device;
establishing a second mapping relation between a third difference value of the second human body temperature measurement value and the second human body temperature standard value and the environment temperature;
acquiring the current environment temperature;
determining a second current difference value between the first current human body temperature measurement value and a first human body temperature standard value corresponding to the first current human body temperature measurement value based on the current environment temperature and the second mapping relation;
adding the second current difference value and the first current human body temperature measurement value to obtain a third current human body temperature measurement value;
calibrating the first current human body temperature measurement based on the current interpupillary distance parameter and the first mapping relationship, comprising:
and calibrating the third current human body temperature measurement value based on the current interpupillary distance parameter and the first mapping relation.
Preferably, the obtaining of different ambient temperatures comprises:
acquiring a visible light image and an infrared image acquired by the infrared temperature measuring device;
carrying out face recognition on the visible light image, and judging whether a face area exists in the visible light image or not;
if not, acquiring second initial temperature data corresponding to the infrared image, and taking the second initial temperature data as the environment temperature.
In order to solve the above technical problem, the present invention provides an infrared temperature measuring device, which includes a visible light camera and a thermopile infrared sensor, and further includes:
a memory for storing a computer program;
a processor for implementing the steps of the temperature calibration method as described above when executing the computer program.
The invention provides a temperature calibration method. In the scheme, because the distance between the temperature measurer and the infrared temperature measuring device has a certain relation with the pupil distance of the temperature measurer, when the distance between the temperature measurer and the infrared temperature measuring device is close, the pupil distance of the temperature measurer is large; when the distance between the temperature measurer and the infrared temperature measuring device is far, the pupil distance of the temperature measurer is small. Therefore, the method and the device provided by the invention take the influence of the distance between the temperature measurer and the temperature measuring device on the temperature measuring result into consideration, calibrate the human body temperature measuring value of the temperature measurer based on the interpupillary distance parameter, and have higher precision.
The invention also provides an infrared temperature measuring device which has the same beneficial effects as the temperature calibration method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a process flow diagram of a temperature calibration method according to the present invention;
FIG. 2a is a schematic diagram of the interpupillary distance of a human face when the distance between a temperature measurer and an infrared temperature measuring device provided by the invention is 1.2 m;
FIG. 2b is a schematic diagram of the interpupillary distance of a human face when the distance between a temperature measurer and the infrared temperature measuring device provided by the invention is 1.0 m;
FIG. 2c is a schematic diagram of the interpupillary distance of a human face when the distance between a temperature measurer and the infrared temperature measuring device provided by the invention is 0.5 m;
FIG. 3 is a graph of a fit of the interpupillary distance parameter to a first difference value provided by the present invention;
FIG. 4 is an infrared image of a black body collected by the infrared temperature measuring device provided by the present invention;
FIG. 5 is a graph of a fit of ambient temperature to a third difference provided by the present invention;
fig. 6 is a schematic diagram of an infrared temperature measuring device provided by the present invention.
Detailed Description
The core of the invention is to provide a temperature calibration method and an infrared temperature measuring device, which take the influence of the distance between a temperature measurer and the temperature measuring device on a temperature measuring result into consideration, calibrate the human body temperature measuring value of the temperature measurer based on the pupil distance parameter and have higher precision.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 2a, fig. 2b, fig. 2c and fig. 3, fig. 1 is a process flow chart of a temperature calibration method according to the present invention; fig. 2a, fig. 2b and fig. 2c are schematic diagrams of pupil distances of a human face at different temperature measuring distances according to the present invention, where fig. 2a illustrates an example where a distance between a temperature measurer and an infrared temperature measuring device is 1.2 meters, fig. 2b illustrates an example where a distance between a temperature measurer and an infrared temperature measuring device is 1.0 meters, and fig. 2c illustrates an example where a distance between a temperature measurer and an infrared temperature measuring device is 0.5 meters; fig. 3 is a fitting graph of the interpupillary distance parameter and the first difference value provided by the present invention, wherein the abscissa is the interpupillary distance parameter, and the ordinate is the first difference value.
The method comprises the following steps:
s11: acquiring pupil distance parameters and a first human body temperature standard value of a temperature measurer when the temperature measurer is at different distances from the infrared temperature measuring device, and acquiring a first human body temperature measured value of the temperature measurer through the infrared temperature measuring device;
s12: establishing a first mapping relation between a first difference value of the first human body temperature measurement value and the first human body temperature standard value and the pupil distance parameter;
s13: acquiring a current pupil distance parameter of a person to be subjected to temperature measurement and obtaining a first current human body temperature measurement value of the person to be subjected to temperature measurement through an infrared temperature measurement device;
s14: and calibrating the first current human body temperature measurement value based on the current pupil distance parameter and the first mapping relation.
The applicant considers that the invention measures the surface temperature of a temperature measurer based on the energy radiated outwards by the temperature measurer received by an infrared temperature measuring device, and the energy radiated outwards by the temperature measurer is transmitted in the atmosphere and has certain loss, so that the temperature measuring distance has great influence on the temperature measuring accuracy. Considering that the distance between the temperature measurer and the infrared temperature measuring device has a certain relation with the pupil distance of the temperature measurer, when the distance between the temperature measurer and the infrared temperature measuring device is close, the pupil distance of the temperature measurer is large; when the distance between the temperature measurer and the infrared temperature measuring device is far, the pupil distance of the temperature measurer is small.
In this embodiment, the pupil distance parameter and the first body temperature standard value of the temperature measurer when the temperature measurer is at different distances from the infrared temperature measuring device are first obtained, and the first body temperature measurement value of the temperature measurer is obtained through the infrared temperature measuring device, and then the first body temperature measurement value is subtracted from the first body temperature standard value and is recorded as a first difference value, so that a first mapping relationship between the first difference value and the pupil distance parameter is established. In the actual temperature measurement process, the current pupil distance parameter of the person to be measured is obtained, the first current human body temperature measurement value of the person to be measured is obtained through the infrared temperature measurement device, the calibration value of the first current human body temperature measurement value is determined based on the current pupil distance parameter and the first mapping relation, and the first current human body temperature measurement value is calibrated based on the determined calibration value of the first current human body temperature measurement value.
For example, the first mapping relationship obtained by fitting the interpupillary distance parameter to the first difference value provided in fig. 3 is-0.8973 x +0.8128, R20.9489, where x is the current interpupillary distance parameter of the person to be thermometric, y is the calibration value for the first current body temperature measurement, R2To determine the coefficients.
The coefficient R is determined2The fitting degree of the curve is an index, the numerical value of the fitting degree can reflect the fitting degree between the estimated value of the curve and the corresponding actual data, and the higher the fitting degree is, the higher the reliability of the fitting curve is. R2Is a value in the range of 0-1, when fitting R of the curve2When the reliability is equal to 1 or close to 1, the reliability is highest, otherwise, the reliability is lower.
As can be seen from table 1, after the first current body temperature measurement value is calibrated based on the calibration value of the first current body temperature measurement value of the person to be measured, the first current body temperature measurement value is close to the first body temperature standard value.
TABLE 1 Effect of thermometric distance calibration on the first current body temperature measurement
Therefore, the method and the device provided by the invention take the influence of the distance between the temperature measurer and the temperature measuring device on the temperature measuring result into consideration, calibrate the human body temperature measuring value of the temperature measurer based on the interpupillary distance parameter, and have higher precision.
On the basis of the above-described embodiment:
as a preferred embodiment, obtaining a first human body temperature measurement of a temperature measurer by an infrared temperature measuring device comprises:
acquiring a visible light image and an infrared image of a temperature measurer, which are acquired by an infrared temperature measuring device, and performing face recognition on the visible light image to obtain a face area;
carrying out face key point positioning on the visible light image to obtain a face key point external connection area;
amplifying the external connection area of the key points of the human face, and taking the smaller of the external connection area of the key points of the human face and the amplified human face as a human face frame area on the visible light image;
mapping the face frame area to an infrared image to obtain an infrared face area;
first initial temperature data corresponding to the infrared face area are obtained, and a first human body temperature measurement value is determined based on the first initial temperature data.
The applicant considers that the first human body temperature measurement value of the temperature measurer is inevitably influenced by factors such as illumination, shielding and a face temperature measurement angle in the process of obtaining the first human body temperature measurement value of the temperature measurer through the infrared temperature measuring device, so that the first human body temperature measurement value of the temperature measurer is inaccurate. Therefore, in this embodiment, the first human body temperature measurement value of the temperature measurer is obtained by mapping the face area in the visible light image to the infrared image to obtain the infrared face area and calculating the first human body temperature measurement value based on the infrared face area.
Specifically, after a visible light image and an infrared image of a temperature measurer acquired by an infrared temperature measuring device are acquired, and a face area is obtained by carrying out face recognition on the visible light image, face key point positioning is combined on the basis of the face recognition, a face key point external area is obtained by carrying out the face key point positioning on the visible light image, the face key point external area is amplified, the smaller one of the face area and the amplified face key point external area is used as a face frame area on the visible light image, the face frame area is mapped to the infrared image, the infrared face area is obtained, first initial temperature data corresponding to the infrared face area is acquired, and a first human body temperature measurement value is calculated according to the first initial temperature data. By adopting the method, the first human body temperature measurement value of a temperature measurer is not accurate due to the influence of factors such as illumination, shielding and a human face temperature measurement angle, and the accuracy of the infrared temperature measuring device is improved.
In addition, the method for obtaining the first human body temperature measurement value of the temperature measurer by using the infrared temperature measuring device is not limited to a method for mapping a face area in a visible light image to an infrared image to obtain an infrared face area by using face recognition and face key point positioning, and calculating the first human body temperature measurement value based on the infrared face area, and the method is not particularly limited herein.
As a preferred embodiment, acquiring the interpupillary distance parameter of the temperature measurer at different distances from the infrared temperature measuring device comprises:
acquiring visible light images of the temperature measurer, which are acquired by the infrared temperature measuring device when the temperature measurer is at different distances from the infrared temperature measuring device;
carrying out face key point positioning on a visible light image of a temperature measurer to obtain face key point coordinates;
the key points of the human face comprise central points of left and right eyes;
and taking a straight-line distance parameter between two central points of the left eye and the right eye as a pupil distance parameter.
In the prior art, the mode of acquiring the distance between a temperature measurer and an infrared temperature measuring device is to arrange an ultrasonic distance measuring sensor, but in the method, chips such as the ultrasonic distance measuring sensor need to be added during temperature calibration, the structure is complex, and the cost is high. In this embodiment, carry out people's face key point location to the visible light image of thermoscope, obtain people's face key point coordinate, because including the central point of eyes about the thermoscope in the people's face key point coordinate, the interpupillary distance parameter is regarded as the interpupillary distance parameter to the straight line distance parameter between two central points of eyes about will, can detect the interpupillary distance of thermoscope accurately, thereby calculate the distance between thermoscope and the infrared temperature measuring device, and need not additionally set up range finding sensor etc. simple structure, the cost is lower.
It should be noted that, considering that the temperature compensation is several degrees in zero degree under the general condition, if the pupil distance parameter takes several hundred pixel values, the horizontal and vertical coordinate difference is too large in the fitting image, and in order to make the fitting curve of fig. 3 easy to observe, the pupil distance parameter here is subjected to normalization processing, specifically, an actual pupil distance value is obtained by the distance between the center points of the left and right eyes in the visible light image, and the actual pupil distance value is divided by the width of the visible light image to obtain the pupil distance parameter, where the width of the visible light image is 1080.
As a preferred embodiment, obtaining a first human body temperature standard value of a temperature measurer comprises:
and acquiring a first human body temperature standard value through a mercury thermometer.
The mercury thermometer can measure the body temperature of a temperature measurer accurately and is close to the actual body temperature of the body. In this embodiment, the first human body temperature standard value is obtained by using the mercury thermometer, and the first human body temperature standard value is used as an accurate human body internal temperature.
It should be noted that the mercury thermometer is not limited in any way, and it is also possible to select the armpit, the oral cavity, or other parts of the thermometer for measurement when the first body temperature standard value is obtained by the mercury thermometer.
As a preferred embodiment, calibrating the first current body temperature measurement based on the current interpupillary distance parameter and the first mapping comprises:
determining a first current difference value between a first current human body temperature measurement value and a first human body temperature standard value corresponding to the first current human body temperature measurement value based on the current pupil distance parameter and the first mapping relation;
and adding the first current difference value and the first current human body temperature measurement value to obtain a first current human body temperature standard value.
In order to eliminate the influence of the distance between the temperature measurer and the infrared temperature measuring device on the temperature measuring accuracy, in this embodiment, the first current human body temperature measurement value is calibrated based on the current pupil distance parameter and the first mapping relationship, specifically, the first current human body temperature measurement value and a first current difference value of a first human body temperature standard value corresponding to the first current human body temperature measurement value are determined based on the current pupil distance parameter of the temperature measurer and the obtained first mapping relationship, and then the first current difference value is added to the first current human body temperature measurement value to obtain the first current human body temperature standard value. The first current human body temperature standard value of the person to be subjected to temperature measurement can be accurately obtained through the calculation method, and the influence of the distance between the person to be subjected to temperature measurement and the infrared temperature measurement device on the temperature measurement accuracy is eliminated.
As a preferred embodiment, before calibrating the first current human body temperature measurement value based on the current interpupillary distance parameter and the first mapping relationship, the method further comprises:
acquiring the temperature of a black body;
acquiring initial temperature data of a black body through an infrared temperature measuring device;
recording the difference value of the temperature of the black body and the initial temperature data of the black body as a second difference value, and adding the first current human body temperature measurement value and the second difference value to obtain a second current human body temperature measurement value;
calibrating the first current body temperature measurement based on the current interpupillary distance parameter and the first mapping relationship, comprising:
and calibrating the second current human body temperature measurement value based on the current pupil distance parameter and the first mapping relation.
Referring to fig. 4, fig. 4 is a black body infrared image acquired by the infrared temperature measuring device provided by the present invention, wherein a dark circular area in the middle of the image is a black body area.
Considering that the infrared temperature measuring device can be influenced by internal components, for example, the internal components can generate certain errors in the transportation process from production completion to use, therefore, in order to improve the temperature measurement precision, the temperature of the internal components is firstly calibrated by using a black body before temperature measurement.
In this embodiment, since the infrared temperature measuring device is used to measure the body temperature of the human body, the temperature of the black body is set near the body surface temperature of the human body, and the distance between the black body and the infrared temperature measuring device is also set near the average distance between the temperature measurer and the infrared temperature measuring device, as shown in fig. 4, the different color representative sensors receive different temperatures, and the dark circular area in the middle of the image is the black body area. In the calibration process, the temperature of the initial temperature data of the black body collected by the infrared temperature measuring device within a certain time is calculated, and the difference value between the temperature of the black body and the initial temperature data of the black body is recorded as a second difference value. For example, setting the black body to 35 ℃ at 0.5 meters from the infrared temperature measuring device yields initial temperature data for the black body of 34.892 ℃, and the second difference is 0.108 ℃. Therefore, the internal components of the infrared temperature measuring device are calibrated through the black body, and the temperature measuring precision of the infrared temperature measuring device is improved.
It should be noted that, in practical application, the black body calibration is performed on the infrared temperature measurement device, the first current human body temperature measurement value and the second difference value are added to obtain a second current human body temperature measurement value, then the temperature measurement distance calibration is performed, and the second current human body temperature measurement value is calibrated based on the current pupil distance parameter and the first mapping relation.
In addition, in this embodiment, the blackbody is a constant temperature water tank, the material reflection coefficient of the constant temperature water tank is closest to 1, and the accuracy of calibrating the internal components of the infrared temperature measurement device by using the constant temperature water tank is high.
Of course, the black body is not limited to the constant temperature water tank, and other types of black bodies may be used to calibrate the internal components of the infrared temperature measuring device, and the application is not limited in this respect.
As a preferred embodiment, before calibrating the first current human body temperature measurement value based on the current interpupillary distance parameter and the first mapping relationship, the method further comprises:
acquiring second human body temperature standard values of the temperature measurer at different environmental temperatures and obtaining a second human body temperature measured value of the temperature measurer through an infrared temperature measuring device;
establishing a second mapping relation between a third difference value of the second human body temperature measurement value and the second human body temperature standard value and the environment temperature;
acquiring the current environment temperature;
determining a second current difference value between the first current human body temperature measurement value and a first human body temperature standard value corresponding to the first current human body temperature measurement value based on the current environment temperature and the second mapping relation;
adding the second current difference value and the first current human body temperature measurement value to obtain a third current human body temperature measurement value;
calibrating the first current body temperature measurement based on the current interpupillary distance parameter and the first mapping relationship, comprising:
and calibrating the third current human body temperature measurement value based on the current pupil distance parameter and the first mapping relation.
Referring to fig. 5, fig. 5 is a fitting graph of the ambient temperature and the third difference value provided by the present invention, wherein the abscissa is the ambient temperature and the ordinate is the third difference value.
Considering that the surface of the forehead area of the face is generally measured in the temperature measuring process and is influenced by the temperature of the environment where the human body is located, when the environment temperature is higher/lower, the temperature of the forehead surface may be higher/lower, so that the measured temperature is higher/lower, and the real body temperature is basically stable.
In this embodiment, first, the second body temperature standard values of the thermometers at different environmental temperatures and different environmental temperatures are obtained, the second body temperature measurement value of the thermometer is obtained through the infrared temperature measurement device, and a second mapping relationship between a third difference value between the second body temperature measurement value and the second body temperature standard value and the environmental temperature is established. In the actual temperature measurement process, the current environment temperature is obtained, a first current human body temperature measurement value of a person to be measured and a second current difference value of a first human body temperature standard value corresponding to the first current human body temperature measurement value are determined based on the current environment temperature and a second mapping relation, the second current difference value is added with the first current human body temperature measurement value to obtain a third current human body temperature measurement value, and then the third current human body temperature measurement value is calibrated based on the current pupil distance parameter and the first mapping relation. Therefore, in the embodiment, the second human body temperature measurement value of the person to be measured is calibrated according to the current environment temperature, so that the temperature measurement precision of the infrared temperature measurement device is improved.
It should be noted that, in order to make the second human body temperature measurement value of the temperature measurer more accurate and stable, in this embodiment, the infrared temperature measuring device is used to perform multiple infrared temperature measurements on the temperature measurer at different environmental temperatures, and the multiple human body temperature measurement values of the temperature measurer at different environmental temperatures are weighted and averaged to obtain the second human body temperature measurement value of the temperature measurer at different environmental temperatures.
It should be noted that, in order to improve the fitting accuracy, when the second mapping relationship between the third difference between the second body temperature measurement value and the second body temperature standard value and the ambient temperature is established, the polynomial y is ax3+bx2And fitting a fitting curve of the third difference value and the ambient temperature by + cx + d to obtain a second mapping relation, wherein coefficients a, b, c and d are obtained by fitting according to actual data.
In addition, the present application is not limited to performing temperature calibration before calibrating the temperature measurement distance, and may also perform temperature calibration first and then perform temperature measurement distance calibration, and the order of temperature measurement distance calibration and temperature calibration is not particularly limited herein.
As a preferred embodiment, acquiring different ambient temperatures comprises:
acquiring a visible light image and an infrared image acquired by an infrared temperature measuring device;
carrying out face recognition on the visible light image, and judging whether a face area exists in the visible light image or not;
and if not, acquiring second initial temperature data corresponding to the infrared image, and taking the second initial temperature data as the environment temperature.
In consideration of the fact that the ambient temperature is obtained by arranging a temperature sensor and the like in the prior art, the method needs to add chips such as the temperature sensor and the like when ambient temperature calibration is carried out, and is complex in structure and high in cost. In this embodiment, the ambient temperature is obtained through the infrared image that infrared temperature measuring device gathered. Specifically, a visible light image and an infrared image acquired by an infrared temperature measuring device are acquired, face recognition is performed on the visible light image, whether a face region exists in the visible light image or not is judged, if the face region does not exist in the visible light image, second initial temperature data corresponding to the infrared image is acquired, and the second initial temperature data is used as the environment temperature. The method for acquiring the ambient temperature does not need to add chips such as a temperature sensor and the like, and is simple in structure and low in cost.
It should be noted that, in order to obtain a more accurate and stable ambient temperature, in this embodiment, under the same environment, the infrared temperature measurement device processes a plurality of infrared images without an infrared face area, so as to obtain a plurality of second initial temperature data, and an exponentially weighted average of the plurality of second initial temperature data is used as the ambient temperature.
Referring to fig. 6, fig. 6 is a schematic view of an infrared temperature measuring device provided by the present invention.
The invention provides an infrared temperature measuring device, which comprises a visible light camera 1 and a thermopile infrared sensor 2, and further comprises:
a memory 3 for storing a computer program;
a processor 4 for implementing the steps of the temperature calibration method as described above when executing a computer program.
For the description of the infrared temperature measuring device provided by the present invention, please refer to the above embodiment of the present invention, and the present invention is not described herein again.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A temperature calibration method is applied to an infrared temperature measuring device and is characterized by comprising the following steps:
acquiring pupil distance parameters and a first human body temperature standard value of a temperature measurer when the temperature measurer is at different distances from the infrared temperature measuring device, and acquiring a first human body temperature measured value of the temperature measurer through the infrared temperature measuring device;
establishing a first mapping relation between a first difference value of the first human body temperature measurement value and the first human body temperature standard value and the pupil distance parameter;
acquiring a current pupil distance parameter of a person to be subjected to temperature measurement and obtaining a first current human body temperature measurement value of the person to be subjected to temperature measurement through the infrared temperature measurement device;
calibrating the first current body temperature measurement value based on the current interpupillary distance parameter and the first mapping relationship.
2. The method of temperature calibration according to claim 1, wherein obtaining a first human body temperature measurement of a thermoscope via the infrared thermometry device comprises:
acquiring a visible light image and an infrared image of a temperature measurer, which are acquired by the infrared temperature measuring device, and performing face recognition on the visible light image to obtain a face area;
carrying out face key point positioning on the visible light image to obtain a face key point external region;
amplifying the external area of the face key point, and taking the smaller of the face area and the amplified external area of the face key point as a face frame area on the visible light image;
mapping the face frame area to the infrared image to obtain an infrared face area;
acquiring first initial temperature data corresponding to the infrared face area, and determining the first human body temperature measurement value based on the first initial temperature data.
3. The method of temperature calibration according to claim 1, wherein obtaining pupillary distance parameters of the thermometer at different distances from said infrared thermometry device comprises:
acquiring visible light images of the temperature measurer, which are acquired by the infrared temperature measuring device when the temperature measurer is at different distances from the infrared temperature measuring device;
carrying out face key point positioning on the visible light image of the temperature measurer to obtain face key point coordinates;
the face key points comprise central points of left and right eyes;
and taking a straight-line distance parameter between two central points of the left eye and the right eye as the pupil distance parameter.
4. The temperature calibration method of claim 1, wherein obtaining a first human body temperature standard value for the thermometer comprises:
and acquiring the first human body temperature standard value through a mercury thermometer.
5. The temperature calibration method of claim 1, wherein calibrating the first current human body temperature measurement based on the current interpupillary distance parameter and the first mapping comprises:
determining a first current difference value between the first current human body temperature measurement value and a first human body temperature standard value corresponding to the first current human body temperature measurement value based on the current pupil distance parameter and the first mapping relation;
and adding the first current difference value and the first current human body temperature measurement value to obtain a first current human body temperature standard value.
6. The temperature calibration method of any one of claims 1 to 5, wherein prior to calibrating the first current human body temperature measurement based on the current interpupillary distance parameter and the first mapping, further comprising:
acquiring the temperature of a black body;
acquiring initial temperature data of the black body through the infrared temperature measuring device;
recording the difference value of the temperature of the black body and the initial temperature data of the black body as a second difference value, and adding the first current human body temperature measurement value and the second difference value to obtain a second current human body temperature measurement value;
calibrating the first current human body temperature measurement based on the current interpupillary distance parameter and the first mapping relationship, comprising:
and calibrating the second current human body temperature measurement value based on the current interpupillary distance parameter and the first mapping relation.
7. The temperature calibration method of any one of claims 1 to 5, wherein prior to calibrating the first current human body temperature measurement based on the current interpupillary distance parameter and the first mapping, further comprising:
acquiring second human body temperature standard values of the temperature measurer at different environmental temperatures and obtaining a second human body temperature measured value of the temperature measurer through the infrared temperature measuring device;
establishing a second mapping relation between a third difference value of the second human body temperature measurement value and the second human body temperature standard value and the environment temperature;
acquiring the current environment temperature;
determining a second current difference value between the first current human body temperature measurement value and a first human body temperature standard value corresponding to the first current human body temperature measurement value based on the current environment temperature and the second mapping relation;
adding the second current difference value and the first current human body temperature measurement value to obtain a third current human body temperature measurement value;
calibrating the first current human body temperature measurement based on the current interpupillary distance parameter and the first mapping relationship, comprising:
and calibrating the third current human body temperature measurement value based on the current interpupillary distance parameter and the first mapping relation.
8. The method of temperature calibration according to claim 7, wherein obtaining different ambient temperatures comprises:
acquiring a visible light image and an infrared image acquired by the infrared temperature measuring device;
carrying out face recognition on the visible light image, and judging whether a face area exists in the visible light image or not;
if not, acquiring second initial temperature data corresponding to the infrared image, and taking the second initial temperature data as the environment temperature.
9. The utility model provides an infrared temperature measuring device, includes visible light camera and thermopile infrared sensor, its characterized in that still includes:
a memory for storing a computer program;
a processor for implementing the steps of the temperature calibration method according to any one of claims 1 to 8 when executing the computer program.
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