CN111751003B - Thermal imager temperature correction system and method and thermal imager - Google Patents
Thermal imager temperature correction system and method and thermal imager Download PDFInfo
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Abstract
The invention discloses a thermal imager temperature correction system, a thermal imager temperature correction method and a thermal imager, wherein the method is based on the system, and infrared rays are radiated outwards from the surface of equipment according to acquired distance data and air quality data, and the loss of the infrared rays in the process of transmission in the air when the infrared rays are acquired by the thermal imager; identifying equipment through visible light image data, acquiring the radiance of the equipment, and calculating the infrared ray quantity radiated and attenuated by the equipment through the radiance; calculating a temperature correction amount according to the consumption of infrared light in air and the infrared ray amount of radiation attenuation of equipment, and correcting the temperature; the thermal imager adopts the temperature correction system to correct the acquired temperature, so that the accuracy of the measured temperature is improved, and the error rate of judgment according to the measured temperature is reduced.
Description
Technical Field
The invention belongs to the technical field of data processing, and particularly relates to a thermal imager temperature correction system and method and a thermal imager.
Background
The thermal infrared imager receives an infrared radiation energy distribution pattern of a detected target by using an infrared detector and an optical imaging objective lens, and then reflects the infrared radiation energy distribution pattern on a photosensitive element of the infrared detector, so as to obtain an infrared thermograph, wherein the thermograph corresponds to a thermal distribution field on the surface of an object. Generally speaking, a thermal imager is an instrument that converts the invisible infrared energy emitted by an object into a visible thermal image. The different colors on the top of the thermal image represent the different temperatures of the object being measured.
Thermal infrared imagers are widely used in both military and civilian applications. With the development of computer processing technology and automatic detection technology, in the detection of a power system, an infrared thermal image of equipment is acquired through a thermal infrared imager, so that the temperature of the equipment is analyzed, and temperature reference is provided for analyzing the running state of the equipment. However, the transmission of infrared rays in the atmosphere is affected by environmental factors, and the surface material parameters of equipment also affect the radiation condition of infrared rays.
The invention patent with the application number of 201610907034.8 discloses a self-adaptive correction method for applying a thermal infrared imager scale function to an actual measurement environment, the method adopts a temperature-controllable black body to calibrate the scale function at a short distance, calculates the coefficient of a scale function expression, then calculates the ratio of a laboratory parameter and an actual temperature measurement environment parameter, and calculates the corrected scale function according to the ratio. According to actual measurement environment parameters (target distance, window, range) and the like, the scale function of the infrared detector is corrected, the defect that the existing scale function only adapts to the laboratory environment is overcome, and meanwhile, the algorithm is simple and easy to implement, no additional hardware module is added, and no power consumption is increased.
In the scheme, a black body with controllable temperature is used as a reference, and a scale function of the thermal infrared imager is corrected by calculating the ratio of laboratory parameters to actual measurement environment parameters. In the scheme, the influence of the environmental parameters on the actually measured infrared temperature is considered, but in the actual use process, the factors influencing the infrared temperature are not only the environmental parameters.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a thermal imager temperature correction system, a thermal imager temperature correction method and a thermal imager, wherein the method is based on the system, the infrared ray is calculated according to the collected distance data and the air quality data, the loss amount of the infrared ray radiated from the surface of equipment in the process of propagating in the air until the infrared ray is collected by the thermal imager is calculated, the equipment is identified through visible light image data, the radiance of the equipment is obtained, and the infrared ray amount radiated and attenuated by the equipment is calculated through the radiance; calculating temperature correction according to the consumption of infrared light in air and the infrared quantity of radiation attenuation of equipment, and correcting the temperature; the thermal imager adopts the temperature correction system to correct the acquired temperature, so that the accuracy of the measured temperature is improved, and the error rate of judgment according to the measured temperature is reduced.
In order to achieve the above purpose, the solution adopted by the invention is as follows: a thermal imager temperature correction system comprises a data receiving unit and a data processing unit, wherein the data receiving unit receives visible light image data, thermal image data corresponding to a visible light image, distance data and air quality data and transmits the data to the data processing unit, and the data processing unit comprises an image identification module, a radiance calculation module, a compensation amount calculation module, an air consumption rate calculation module, a consumption amount calculation module and a temperature correction calculation module; the image recognition module is used for recognizing equipment in the visible light image data; the radiance calculation module acquires equipment surface material parameters according to the equipment identified by the image identification module, and calculates radiance according to the surface material parameters; the compensation amount calculation module calculates the infrared amount of the radiation attenuation of the equipment through the radiance; the air consumption rate calculation module calculates the consumption rate of infrared light transmitted in the air according to the air quality data; the consumption calculating module calculates the consumption of infrared light in the air according to the consumption and distance data calculated by the air consumption calculating module; the temperature correction calculation module calculates a temperature correction amount according to the consumption of infrared light in air and the infrared amount of radiation attenuation of equipment, and corrects the temperature.
The system also comprises a storage unit, wherein the storage unit is used for storing pictures, models and surface material parameters of different devices. The image identification module can identify the type and the model of equipment contained in the visible light image data according to pictures of different equipment stored in the storage unit, and can acquire the surface material parameters according to the model for calculating the radiance of the surface of the equipment.
The image recognition module is used for recognizing the type of equipment in the visible light image data, and the air quality data comprises air humidity and air particulate content. The humidity and particulate content of air can cause infrared rays radiated by the equipment to be reflected or absorbed in the process of transmission, so that loss is caused.
The calculation formula of the consumption of the infrared light transmitted in the air is as follows: consumption = consumption rate × distance. Infrared rays radiated by the equipment are absorbed or reflected by particles or water vapor in the air when the infrared rays are transmitted in the air, and the consumption process is accompanied by the whole process of infrared ray transmission, so that the longer the transmission distance is, the larger the consumption is, and therefore, distance factors need to be considered when the consumption amount transmitted in the air is calculated, errors are further reduced, and the corrected data are more accurate.
The calculation formula of the temperature correction quantity is as follows: actual temperature = measured temperature + consumption + amount of infrared attenuated by the device radiation.
The thermal imager temperature correction system based method comprises the following steps:
s1: receiving visible light image data, thermal image data corresponding to the visible light image, distance data and air quality data;
s2: the image identification module is used for identifying equipment in the visible light image data;
s3: the radiance calculation module acquires equipment surface material parameters according to the equipment identified by the image identification module, and calculates radiance according to the surface material parameters;
s4: the compensation amount calculation module calculates the infrared amount of the radiation attenuation of the equipment through the radiance;
s5: the air consumption rate calculation module calculates the consumption rate of infrared light transmitted in the air according to the air quality data;
s6: the consumption calculating module calculates the consumption of infrared light in the air according to the consumption and the distance data calculated by the air consumption calculating module;
s7: the temperature correction calculation module calculates a temperature correction amount according to the consumption of infrared light in air and the infrared ray amount of radiation attenuation of equipment, and corrects the temperature.
The calculation formula of the consumption of the infrared light in the air is as follows: consumption = consumption rate × distance; the calculation formula of the temperature correction quantity is as follows: actual temperature = measured temperature + consumption + amount of infrared attenuated by the device radiation. According to the thermal imager temperature correction system, the collected equipment temperature is corrected by combining the consumption of infrared light transmitted in the air and the infrared quantity of radiation attenuation of the equipment, so that the collected equipment temperature is more accurate.
The thermal imager using the thermal imager temperature correction system comprises an air quality detection device, a visible light image acquisition device, a distance acquisition device, an infrared thermal image acquisition device and a processor, wherein the processor is used for operating the thermal imager temperature correction system, the air quality detection device acquires air quality data and transmits the air quality data to a data receiving unit, the visible light image acquisition device acquires visible light image data and transmits the data to the data receiving unit, the distance acquisition device acquires distance data and transmits the distance data to the data receiving unit, and the infrared thermal image acquisition device acquires thermal image data corresponding to the visible light image and transmits the thermal image data to the data receiving unit. The air quality data includes air humidity and air particulate content. The thermal imager can collect visible light image data, thermal image data corresponding to the visible light image, distance data and air quality data, and a temperature correction system is adopted to correct the collected temperature, so that the accuracy of the measured temperature is improved, and the error rate of judgment according to the measured temperature is reduced.
The beneficial effects of the invention are:
based on the system, the method calculates the loss amount of infrared rays radiated from the surface of equipment and transmitted in the air when the infrared rays are collected by a thermal imager according to collected distance data and air quality data, identifies the equipment through visible light image data, obtains the radiance of the equipment, and calculates the infrared ray amount attenuated by the radiation of the equipment through the radiance; calculating temperature correction according to the consumption of infrared light in air and the infrared quantity of radiation attenuation of equipment, and correcting the temperature; the thermal imager adopts the temperature correction system to correct the acquired temperature, so that the accuracy of the measured temperature is improved, and the error rate of judgment according to the measured temperature is reduced.
The thermal imager can collect visible light image data, thermal image data corresponding to the visible light image, distance data and air quality data, and a temperature correction system is adopted to correct the collected temperature, so that the accuracy of the measured temperature is improved, and the error rate of judgment according to the measured temperature is reduced.
Drawings
FIG. 1 is a block diagram of a thermal imager temperature correction system of the present invention;
FIG. 2 is a flow chart of a thermal imager temperature correction method of the present invention;
FIG. 3 is a block diagram of a thermal imager in accordance with the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, a thermal imager temperature correction system comprises a data receiving unit and a data processing unit, wherein the data receiving unit receives visible light image data, thermal image data corresponding to a visible light image, distance data and air quality data, and transmits the data to the data processing unit, and the data processing unit comprises an image identification module, a radiance calculation module, a compensation amount calculation module, an air consumption rate calculation module, a consumption amount calculation module and a temperature correction calculation module; the image identification module is used for identifying equipment in the visible light image data; the radiance calculation module acquires equipment surface material parameters according to the equipment identified by the image identification module and calculates radiance according to the surface material parameters; the compensation amount calculation module calculates the infrared amount of the radiation attenuation of the equipment through the radiance; the air consumption rate calculation module calculates the consumption rate of infrared light transmitted in the air according to the air quality data; the consumption calculating module calculates the consumption of the infrared light in the air according to the consumption calculated by the air consumption calculating module and the distance data; the temperature correction calculation module calculates temperature correction according to the consumption of infrared light in air and the infrared quantity of equipment radiation attenuation, and corrects the temperature.
The system also comprises a storage unit, wherein the storage unit is used for storing pictures, models and surface material parameters of different devices. The image recognition module can recognize the type and the model of equipment contained in the visible light image data according to pictures of different equipment stored in the storage unit, and can acquire the surface material parameters according to the model for calculating the radiance of the surface of the equipment.
The image recognition module is used for recognizing the type of equipment in the visible light image data, and the air quality data comprises air humidity and air particulate content. The humidity and particulate content of air can cause infrared rays radiated by the equipment to be reflected or absorbed in the process of transmission, so that loss is caused.
The calculation formula of the consumption of the infrared light in the air is as follows: consumption = consumption rate × distance. Infrared rays radiated by the equipment are absorbed or reflected by particles or water vapor in the air when the infrared rays are transmitted in the air, and the consumption process is accompanied by the whole process of infrared ray transmission, so that the longer the transmission distance is, the larger the consumption is, and therefore, distance factors need to be considered when the consumption amount transmitted in the air is calculated, errors are further reduced, and corrected data are more accurate.
The calculation formula of the temperature correction quantity is as follows: actual temperature = measured temperature + consumption + amount of infrared attenuated by the device radiation.
As shown in fig. 2, the method based on the thermal imager temperature correction system includes the following steps:
s1: receiving visible light image data, thermal image data corresponding to the visible light image, distance data and air quality data;
s2: the image identification module is used for identifying equipment in the visible light image data;
s3: the radiance calculation module acquires equipment surface material parameters according to the equipment identified by the image identification module and calculates radiance according to the surface material parameters;
s4: the compensation amount calculation module calculates the infrared amount of the radiation attenuation of the equipment through the radiance;
s5: the air consumption rate calculation module calculates the consumption rate of infrared light transmitted in the air according to the air quality data;
s6: the consumption calculating module calculates the consumption of infrared light in the air according to the consumption and the distance data calculated by the air consumption calculating module;
s7: the temperature correction calculation module calculates a temperature correction amount according to the consumption of infrared light in air and the infrared ray amount of radiation attenuation of equipment, and corrects the temperature.
The calculation formula of the consumption of the infrared light transmitted in the air is as follows: consumption = consumption rate × distance; the calculation formula of the temperature correction quantity is as follows: actual temperature = measured temperature + consumption + amount of infrared attenuated by the device radiation. According to the thermal imager temperature correction system, the collected equipment temperature is corrected by combining the consumption of infrared light transmitted in the air and the infrared quantity of radiation attenuation of the equipment, so that the collected equipment temperature is more accurate.
As shown in fig. 3, the thermal imager using the thermal imager temperature correction system includes an air quality detection device, a visible light image acquisition device, a distance acquisition device, an infrared thermal image acquisition device and a processor, wherein the processor is used for operating the thermal imager temperature correction system, the air quality detection device acquires air quality data and transmits the air quality data to a data receiving unit, the visible light image acquisition device acquires visible light image data and transmits the visible light image data to the data receiving unit, the distance acquisition device acquires distance data and transmits the distance data to the data receiving unit, and the infrared thermal image acquisition device acquires thermal image data corresponding to the visible light image and transmits the thermal image data to the data receiving unit. The air quality data includes air humidity and air particulate content. The thermal imager can collect visible light image data, thermal image data corresponding to the visible light image, distance data and air quality data, and a temperature correction system is adopted to correct the collected temperature, so that the accuracy of the measured temperature is improved, and the error rate of judgment according to the measured temperature is reduced.
In one embodiment of the application, the visible light image acquisition device adopts a high definition camera, the resolution ratio of the high definition camera is the same as that of the infrared thermal image acquisition device, and the high definition camera and the infrared thermal image acquisition device need to be arranged to acquire images which can be superposed. The distance acquisition device adopts a laser range finder, the distance measurement of the laser range finder is accurate, and the laser range finder needs to be arranged to acquire the distance from equipment acquired by a high-definition camera to a thermal imager.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. A thermal imager temperature correction system is characterized in that: the system comprises a data receiving unit and a data processing unit, wherein the data receiving unit receives visible light image data, thermal image data corresponding to a visible light image, distance data and air quality data and transmits the data to the data processing unit, and the data processing unit comprises an image identification module, a radiance calculation module, a compensation amount calculation module, an air consumption rate calculation module, a consumption amount calculation module and a temperature correction calculation module; the image recognition module is used for recognizing equipment in the visible light image data; the radiance calculation module acquires equipment surface material parameters according to the equipment identified by the image identification module, and calculates radiance according to the surface material parameters; the compensation amount calculation module calculates the infrared amount of the radiation attenuation of the equipment through the radiance; the air consumption rate calculation module calculates the consumption rate of infrared light transmitted in the air according to the air quality data; the consumption calculating module calculates the consumption of infrared light in the air according to the consumption and distance data calculated by the air consumption calculating module; the temperature correction calculation module calculates temperature correction according to the consumption of infrared light in air and the infrared quantity of equipment radiation attenuation, and corrects the temperature.
2. The thermal imager temperature correction system of claim 1, wherein: the system also comprises a storage unit, wherein the storage unit is used for storing pictures, models and surface material parameters of different devices.
3. The thermal imager temperature correction system of claim 1 or 2, wherein: the image recognition module is used for recognizing the type of equipment in the visible light image data, and the air quality data comprises air humidity and air particulate content.
4. The thermal imager temperature correction system of claim 3, characterized in that: the calculation formula of the consumption of the infrared light in the air is as follows: consumption = consumption rate × distance.
5. The thermal imager temperature correction system of claim 4, wherein: the calculation formula of the temperature correction quantity is as follows: actual temperature = measured temperature + consumption + amount of infrared attenuated by the device radiation.
6. A thermal imager temperature correction method applied to the thermal imager temperature correction system of any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1: receiving visible light image data, thermal image data corresponding to the visible light image, distance data and air quality data;
s2: the image identification module is used for identifying equipment in the visible light image data;
s3: the radiance calculation module acquires equipment surface material parameters according to the equipment identified by the image identification module and calculates radiance according to the surface material parameters;
s4: the compensation amount calculation module calculates the infrared amount of radiation attenuation of the equipment through the radiance;
s5: the air consumption rate calculation module calculates the consumption rate of the infrared light transmitted in the air according to the air quality data;
s6: the consumption calculating module calculates the consumption of infrared light in the air according to the consumption and the distance data calculated by the air consumption calculating module;
s7: the temperature correction calculation module calculates a temperature correction amount according to the consumption of infrared light propagating in the air and the infrared amount of radiation attenuation of the equipment, and corrects the temperature.
7. The thermal imager temperature correction method of claim 6, characterized in that: the calculation formula of the consumption of the infrared light transmitted in the air is as follows: consumption = consumption rate × distance; the calculation formula of the temperature correction quantity is as follows: actual temperature = measured temperature + consumption + amount of infrared attenuated by the device radiation.
8. A thermal imager comprising the thermal imager temperature correction system of any one of claims 1-5, characterized in that: the thermal imager temperature correction system comprises an air quality detection device, a visible light image acquisition device, a distance acquisition device, an infrared thermal image acquisition device and a processor, wherein the processor is used for operating the thermal imager temperature correction system as claimed in any one of claims 1 to 5, the air quality detection device acquires air quality data and transmits the air quality data to a data receiving unit, the visible light image acquisition device acquires visible light image data and transmits the visible light image data to the data receiving unit, the distance acquisition device acquires distance data and transmits the distance data to the data receiving unit, and the infrared thermal image acquisition device acquires thermal image data corresponding to the visible light image and transmits the thermal image data to the data receiving unit.
9. The thermal imager of claim 8, wherein: the air quality data includes air humidity and air particulate content.
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| PCT/CN2021/099186 WO2021249437A1 (en) | 2020-06-10 | 2021-06-09 | Thermal imager temperature correction system and method, thermal imager and computer-readable recording medium |
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| CN110196103A (en) * | 2019-06-27 | 2019-09-03 | Oppo广东移动通信有限公司 | Thermometry and relevant device |
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| CN111751003B (en) * | 2020-06-10 | 2022-12-13 | 四川省东宇信息技术有限责任公司 | Thermal imager temperature correction system and method and thermal imager |
-
2020
- 2020-06-10 CN CN202010525138.9A patent/CN111751003B/en active Active
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2021
- 2021-06-09 WO PCT/CN2021/099186 patent/WO2021249437A1/en active Application Filing
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2022
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| WO2021249437A1 (en) | 2021-12-16 |
| CN111751003A (en) | 2020-10-09 |
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