Temperature measurement method based on infrared detector parameter adaptation, and electronic device

Abstract

A temperature measurement method based on infrared detector parameter adaption, and an electronic device. The method comprises the following steps: acquiring a radiation intensity matrix of a current infrared image, and obtaining a radiation response difference value of the infrared image; determining whether a difference value △F between the radiation response difference value of the infrared image and a preset optimal radiation response difference value is less than a specific threshold, and if not, adjusting a current integration time on the basis of the difference value △F until the difference value between the radiation response difference value of the current infrared image and the preset optimal radiation response difference value is less than the threshold; and outputting a current temperature measurement result on the basis of a radiation intensity-temperature curve corresponding to an integration time sampling point near the current integration time. The current integration time of a detector is adaptively adjusted, so that an optimal infrared image display effect and a maximum temperature measurement accuracy are obtained within a dynamic range of an infrared detector.

Description

Temperature measurement method based on infrared detector parameter self-adaption and electronic equipment TECHNICAL FIELD

[0001] The present application relates to the field of infrared temperature measurement, and in particular to a temperature measurement method based on infrared detector parameter self-adaption and an electronic equipment. BACKGROUND

[0002] With the increasing maturity of infrared thermal imaging technology, users have higher and higher requirements for the imaging effect and temperature measurement accuracy of infrared imaging equipment such as infrared thermal imagers.

[0003] Currently, infrared thermal imagers on the market are usually divided into 2-3 levels, and then the corresponding response rate parameters are set for each level in advance, and low (high) gain is used to observe or measure high (low) temperature targets. Then switch between two levels in a certain way to achieve adaptive adjustment of the temperature measurement range.

[0004] If there are target objects in the current scene in both levels, no matter how the switching strategy is adjusted, there will be a situation where one target exceeds the range (imaging as overexposure) or the signal-to-noise ratio is low.

[0005] SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a temperature measurement method based on infrared detector parameter self-adaption and an electronic equipment to improve the accuracy of temperature measurement in different environments.

[0007] To achieve the above object, the present application provides the following technical scheme:

[0008] In a first aspect, the present application provides a temperature measurement method based on infrared detector parameter self-adaption, comprising the following steps:

[0009] Obtain the radiation intensity matrix of the current infrared image and obtain the radiation response difference value of the infrared image, the radiation response difference value being the difference between the maximum radiation intensity and the minimum radiation intensity in the radiation intensity matrix;

[0010] Determine whether the difference between the radiation response difference value of the infrared image and the preset optimal radiation response difference value is less than a certain threshold value, if not, adjust the current integration time according to the difference value F until the difference between the radiation response difference value of the current infrared image and the preset optimal radiation response difference value is less than the threshold value;

[0011] Output the current temperature measurement result according to the radiation intensity-temperature curve corresponding to the integration time sampling point near the current integration time.

[0012] Preferably, the preset optimal radiation response difference value is determined according to the following method:

[0013] acquiring the maximum dynamic range of the infrared detector;

[0014] determining the maximum radiation intensity and the minimum radiation intensity of the infrared image according to the maximum dynamic range of the infrared detector and the working environment temperature of the infrared detector;

[0015] calculating the difference between the maximum radiation intensity and the minimum radiation intensity of the infrared image as a preset optimal radiation response difference value.

[0016] Preferably, the method for adjusting the current integration time according to the difference value ΔF is as follows:

[0017] determining the current integration time;

[0018] obtaining an integration time adjustment value according to the difference value ΔF and a corresponding relationship between the detector integration time and the radiation response difference value;

[0019] adding the current integration time and the integration time adjustment value to obtain an adjusted current integration time.

[0020] Preferably, the method for obtaining the corresponding relationship between the detector integration time and the radiation response difference value is as follows:

[0021] uniformly selecting a plurality of integration time sampling points within the integration time adjustment range of the infrared detector;

[0022] collecting the radiation amounts of two black bodies at different temperatures at each integration time sampling point, and obtaining the radiation amount difference between the two black bodies to obtain a plurality of integration time sampling point-radiation amount difference data;

[0023] linearly fitting the plurality of integration time sampling point-radiation amount difference data to obtain the corresponding relationship between the detector integration time and the radiation response difference value.

[0024] Preferably, the output of the current temperature measurement result according to the radiation intensity-temperature curve corresponding to the integration time sampling point near the current integration time specifically includes:

[0025] uniformly selecting a plurality of integration time sampling points within the integration time adjustment range of the infrared detector

[0026] obtaining the radiation intensity-temperature curve corresponding to each integration time sampling point;

[0027] determining one or two integration time sampling points near the current integration time and the corresponding radiation intensity-temperature curve;

[0028] obtaining the current temperature measurement result according to the determined radiation intensity-temperature curve and the radiation intensity of the current temperature measurement point and outputting.

[0029] Preferably, if the integral time sampling points near the current integral time are two, the calculation method of the current temperature measurement result according to the determined radiation intensity-temperature curve and the radiation intensity of the current temperature measurement point is as follows:

[0030] Temp=β1*C i (Y16)+β2*C j (Y16)

[0031] In the above formula, Ci and Cj are the radiation intensity-temperature curves corresponding to the two integral time sampling points near the current integral time; β1 and β2 are the weights of the curves Ci and Cj, respectively; Ci(Y16) and Cj(Y16) are the temperature values queried in the curves Ci and Cj, respectively, according to the radiation intensity of the current temperature measurement point.

[0032] Preferably, the weights β1 and β2 of the curves Ci and Cj are determined according to the closeness of the integral time sampling points corresponding to the curves Ci and Cj to the current integral time, and the closer the integral time sampling point corresponding to a curve to the current integral time, the higher the weight of the curve.

[0033] Preferably, if the difference between the radiation response difference of the current infrared image and the preset optimal radiation response difference is not less than the threshold value after adjusting the current integral time according to the difference value ΔF, it is first determined whether the adjusted current integral time exceeds its linear working interval, and if so, the current integral time before adjustment is taken as the final integral time.

[0034] In a second aspect, the present application further provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the temperature measurement method based on the parameter adaptation of the infrared detector when executing the computer program.

[0035] In a third aspect, the present application further provides a readable storage medium, which stores a computer program, and the processor implements the steps of the temperature measurement method based on the parameter adaptation of the infrared detector when executing the computer program.

[0036] In summary, the present application has the following beneficial effects compared with the prior art:

[0037] The present application adjusts the current integration time of the detector adaptively, so that the difference between the radiation response difference of the current infrared image and the preset optimal radiation response difference is less than a certain threshold, thereby obtaining the optimal infrared image display effect and the highest temperature measurement accuracy in the dynamic range of the infrared detector, without the problems of image overexposure and temperature measurement failure caused by the target exceeding the range, and the problems of low image signal-to-noise ratio and inaccurate temperature measurement result caused by the target being lower than the range. BRIEF DESCRIPTION OF DRAWINGS

[0038] Fig. 1 is a whole flowchart of a temperature measurement method based on infrared detector parameter adaptation provided by the present embodiment;

[0039] Fig. 2 is a detailed flowchart of a temperature measurement method based on infrared detector parameter adaptation provided by the present embodiment. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely in the embodiments of the present application in combination with the accompanying drawings, obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments, based on the embodiments in the present application, all the other embodiments obtained by the ordinary skilled in the art without creative labor are within the protection scope of the present application.

[0041] As shown in Fig. 1 and Fig. 2, the present embodiment provides a temperature measurement method based on infrared detector parameter adaptation, which specifically includes the following steps:

[0042] S1, obtaining the radiation intensity matrix of the current infrared image, and obtaining the radiation response difference of the infrared image, the radiation response difference being the difference between the maximum radiation intensity and the minimum radiation intensity in the radiation intensity matrix;

[0043] Specifically, first, the infrared image is acquired in real time, each pixel point of the infrared image contains corresponding radiation intensity information, thereby forming a radiation intensity matrix, then the maximum radiation intensity and the minimum radiation intensity in the infrared intensity matrix are obtained, and the difference between the two is the radiation response difference of the infrared image. Assuming that the radiation intensity matrix obtained by the current infrared detector is YM, the length of which is m and the width of which is n, each radiation intensity in YM is traversed to obtain the maximum radiation intensity Y16 max and the minimum radiation intensity Y16 min , and the radiation response difference ΔRTY16=Y16 max -Y16 min .

[0044] S2, judging whether a difference value between the radiation response difference value of the infrared image and the preset optimal radiation response difference value is less than a certain threshold value, if not, adjusting the current integration time according to the difference value ΔF until the difference value between the radiation response difference value of the current infrared image and the preset optimal radiation response difference value is less than the threshold value;

[0045] Before this step, the optimal radiation response difference value needs to be preset. The infrared image can obtain the best image display effect and the highest temperature measurement accuracy at the optimal radiation response difference value, and problems such as image overexposure and failure to measure temperature due to the target exceeding the range, and problems such as low image signal-to-noise ratio and inaccurate temperature measurement results due to the target being lower than the range will not occur. The optimal radiation response difference value is mainly determined according to the maximum dynamic range of the infrared detector. Since the actual range of the infrared detector is affected by the environmental temperature, in order to ensure the accuracy of the temperature measurement results of the infrared detector at different environmental temperatures, the determination of the optimal radiation response difference value also needs to consider the environmental temperature. In the embodiment, the preset optimal radiation response difference value is determined according to the following method:

[0046] Obtaining the maximum dynamic range R of the infrared detector max The maximum dynamic range of the infrared detector refers to the maximum radiation intensity that can be detected by the infrared detector, which is determined by the AD conversion bit number;

[0047] Determining the maximum radiation intensity and the minimum radiation intensity of the infrared image according to the maximum dynamic range of the infrared detector and the working environmental temperature of the infrared detector; that is, leaving a certain margin at both ends of the actual dynamic range of the infrared detector, in this embodiment, the maximum radiation intensity of the infrared image is determined to be 0.8R max and the minimum radiation intensity is determined to be 0.2R max through experiments at different working environmental temperatures;

[0048] Calculating the difference value between the maximum radiation intensity and the minimum radiation intensity of the infrared image as the preset optimal radiation response difference value, that is, the optimal radiation response difference value Range = 0.8R max - 0.2R max = 0.6R max in this embodiment.

[0049] Then the radiation response difference value of the current infrared image needs to be adjusted to the vicinity of the optimal radiation response difference value. First, judging whether the difference value ΔF between the radiation response difference value of the infrared image and the preset optimal radiation response difference value is less than a certain threshold value, if yes, it means that the radiation response difference value of the current infrared image is already in the vicinity of the optimal radiation response difference value, and the current integration time of the detector does not need to be adjusted. If not, the current integration time needs to be adjusted according to the difference value ΔF between the radiation response difference value of the infrared image and the preset optimal radiation response difference value.

[0050] Before adjusting the current integration time of the detector, a corresponding relationship between the integration time of the detector and the difference between the radiation responses needs to be obtained, and in the embodiment, the specific obtaining method is as follows:

[0051] A plurality of integration time sampling points are uniformly selected within the integration time adjustment range of the infrared detector; it is assumed that the adjustment range of the integration time of the infrared detector is T min ~T max , and n integration time sampling points T1, T2, T3…T n ,

[0052] The radiation intensities Y16 BB1 and Y16 BB2 of two black bodies BB1 and BB2 at different temperatures are respectively collected at each integration time sampling point Tn, wherein the two black bodies at different temperatures are preferably two black bodies corresponding to the minimum temperature and the maximum temperature that can be detected by the detector; and the difference ΔY16n between the radiation responses of the two black bodies is calculated, and the calculation method is as follows:

[0053] ΔY16 n = Y16 BB1 - Y16 BB2

[0054] A plurality of sets of integration time sampling point-radiation quantity difference data are obtained; and the plurality of sets of integration time sampling point-radiation quantity difference data are linearly fitted to obtain a corresponding relationship formula between the integration time Tn of the detector and the difference ΔY16n between the radiation responses:

[0055] ΔY16 n = f(T n )

[0056] The corresponding relationship between the integration time of the detector and the difference between the radiation responses obtained by the above method is basically consistent with the corresponding relationship between the integration time of the infrared image and the difference between the radiation responses, so that the integration time adjustment value corresponding to the difference △F between the radiation response difference of the infrared image and the preset optimal radiation response difference can be obtained through the above corresponding relationship. The method for adjusting the current integration time according to the difference △F is as follows:

[0057] The current integration time is determined; specifically, the current integration time of the infrared detector can be directly determined according to the stored current integration time of the infrared detector, or the current integration time of the detector can be obtained according to the radiation response difference of the current infrared image and the corresponding relationship between the integration time of the detector and the difference between the radiation responses

[0058] The integration time adjustment value is obtained according to the difference △F and the corresponding relationship between the integration time of the detector and the difference between the radiation responses;

[0059] adding the current integration time and the integration time adjustment value to obtain an adjusted current integration time.

[0060] After adjusting the current integration time, steps S1 and S2 are repeated until the difference between the radiation response difference of the current infrared image and the preset optimal radiation response difference is less than the threshold value.

[0061] S3. Outputting a current temperature measurement result according to the radiation intensity-temperature curve corresponding to the integration time sampling point near the current integration time.

[0062] Before this step, the radiation intensity-temperature curves corresponding to a plurality of integration time sampling points need to be obtained, and the specific obtaining method is as follows:

[0063] Selecting a plurality of integration time sampling points uniformly within the integration time adjustment range of the infrared detector

[0064] At each integration time sampling point Tn, the radiation intensity Y16mn corresponding to m temperature points is collected, and then the fourth power relationship is used to calibrate the radiation intensity-temperature curve Cn corresponding to the integration time Tn, that is:

[0065] T BB =a1*Y16 4 +a2*Y16 3 +a3*Y16 2 +a4*Y16+a5.

[0066] Wherein, T BB represents temperature, Y16 represents radiation intensity, a1, a2, a3, a4, and a5 all represent coefficients.

[0067] In one embodiment, the outputting of the current temperature measurement result according to the radiation intensity-temperature curve corresponding to the integration time sampling point near the current integration time specifically includes:

[0068] Determining one or two integration time sampling points near the current integration time and the corresponding radiation intensity-temperature curve; if the current integration time coincides with or has a small error with a certain integration time sampling point, the integration time sampling point is determined as the integration time sampling point near the current integration time; if the current integration time is between two integration time sampling points, the two integration time sampling points are determined as the integration time sampling points near the current integration time.

[0069] According to the determined radiation intensity-temperature curve and the radiation intensity of the current temperature measurement point, a current temperature measurement result is obtained and outputted.

[0070] If the integral time sampling points near the current integral time are one, the current temperature measurement result is obtained according to the radiation intensity-temperature curve corresponding to the integral time sampling point and the radiation intensity of the current temperature measurement point, and outputted; if the integral time sampling points near the current integral time are two, the calculation method of the current temperature measurement result according to the determined radiation intensity-temperature curve and the radiation intensity of the current temperature measurement point is as follows:

[0071] Temp = β1 * C i (Y16) + β2 * C j (Y16)

[0072] In the above formula, Ci and Cj are the radiation intensity-temperature curves corresponding to the two integral time sampling points near the current integral time; β1 and β2 are the weights of the curves Ci and Cj, respectively; Ci(Y16) and Cj(Y16) are the temperature values of the current temperature measurement point radiation intensity inquired in the curves Ci and Cj, respectively.

[0073] Preferably, the weights β1 and β2 of the curves Ci and Cj are determined according to the proximity of the integral time sampling points corresponding to the curves Ci and Cj to the current integral time, and the closer the integral time sampling point corresponding to a certain curve to the current integral time, the higher the weight of the curve.

[0074] In one embodiment, the calculation method of the weights β1 and β2 of the curves Ci and Cj is as follows:

[0075] Suppose the current integral time T' is between the integral time sampling points Ti and Tj, then:

[0076] Preferably, if the difference between the radiation response difference of the current infrared image and the preset optimal radiation response difference is not less than the threshold value after adjusting the current integral time according to the difference value ΔF, it is first judged whether the adjusted current integral time exceeds its linear working interval, and if so, the adjusted current integral time is taken as the final integral time. This method can avoid the current integral time exceeding its linear working interval and causing temperature measurement failure.

[0077] Based on the same inventive concept, the embodiments of the present application also provide an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the temperature measurement method based on the infrared detector parameter self-adaption as described above when executing the computer program.

[0078] The processor in some embodiments can be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor is generally used to control the overall operation of the electronic device. In the present embodiment, the processor is used to run program codes or process data stored in the memory, such as the program code of the vehicle collision warning method.

[0079] The memory includes at least one type of readable storage medium, such as flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory can be an internal storage unit of the electronic device, such as a hard disk or memory of the electronic device. In other embodiments, the memory can also be an external storage device of the electronic device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on the electronic device. Of course, the memory can also include both the internal storage unit and the external storage device of the electronic device. In the present embodiment, the memory is generally used to store the operating method and various application software installed on the electronic device, such as the program code of the vehicle collision warning method, etc. In addition, the memory can also be used to temporarily store various data that have been output or will be output.

[0080] Based on the same inventive concept, the present application also provides a readable storage medium having a computer program stored therein, wherein the computer program is executed by a processor to implement the steps of the infrared detector parameter adaptive temperature measurement method as described above.

[0081] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage, etc.) containing computer-usable program code.

[0082] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks or in conjunction with the flowchart blocks.

[0083] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks or in conjunction with the flowchart blocks.

[0084] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks or in conjunction with the flowchart blocks.

[0085] It can be understood that the above implementation is only an exemplary implementation adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and principle of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A temperature measurement method based on infrared detector parameter self-adaption, characterized in that, The method comprises the following steps: obtaining a radiation intensity matrix of a current infrared image and obtaining a radiation response difference value of the infrared image, the radiation response difference value being a difference value between a maximum radiation intensity and a minimum radiation intensity in the radiation intensity matrix; determining whether a difference value ΔF between the radiation response difference value of the infrared image and a preset optimal radiation response difference value is less than a certain threshold value, and if not, adjusting a current integration time according to the difference value ΔF until the difference value between the radiation response difference value of the current infrared image and the preset optimal radiation response difference value is less than the threshold value; outputting a current temperature measurement result according to a radiation intensity-temperature curve corresponding to an integration time sampling point near the current integration time.

2. The method for self-adapting temperature measurement based on infrared detector parameters according to claim 1, characterized in that, The preset optimal radiation response difference value is determined according to the following method: obtaining a maximum dynamic range of an infrared detector; determining a maximum radiation intensity and a minimum radiation intensity of an infrared image according to the maximum dynamic range of the infrared detector and an operating environment temperature of the infrared detector; calculating a difference value between the maximum radiation intensity and the minimum radiation intensity of the infrared image as the preset optimal radiation response difference value.

3. The method of claim 1, wherein the infrared detector parameter adaptive temperature measurement method is characterized by, The method for adjusting the current integration time according to the difference value ΔF is as follows: determining the current integration time; obtaining an integration time adjustment value according to the difference value ΔF and a corresponding relationship between a detector integration time and a radiation response difference value; adding the current integration time and the integration time adjustment value to obtain an adjusted current integration time.

4. The method of claim 3, wherein the step of determining the temperature of the infrared detector is performed by using a look-up table. The corresponding relationship between the detector integration time and the radiation response difference value is obtained as follows: uniformly selecting a plurality of integration time sampling points within an integration time adjustment range of the infrared detector; collecting radiation amounts of two black bodies at different temperatures under each integration time sampling point and obtaining a radiation amount difference value between the two black bodies to obtain a plurality of integration time sampling point-radiation amount difference value data; linearly fitting the plurality of integration time sampling point-radiation amount difference value data to obtain the corresponding relationship between the detector integration time and the radiation response difference value. The method for outputting the current temperature measurement result according to the radiation intensity-temperature curve corresponding to the integration time sampling point near the current integration time specifically comprises the following steps:

5. The method of claim 1, wherein the infrared detector parameter adaptive temperature measurement method is characterized by, uniformly selecting a plurality of integration time sampling points within an integration time adjustment range of the infrared detector obtaining a radiation intensity-temperature curve corresponding to each integration time sampling point; determining one or two integration time sampling points near the current integration time and corresponding radiation intensity-temperature curves; obtaining a current temperature measurement result according to the determined radiation intensity-temperature curve and a radiation intensity of a current temperature measurement point and outputting the current temperature measurement result. If the integration time sampling points near the current integration time are two, the method for obtaining the current temperature measurement result according to the determined radiation intensity-temperature curve and the radiation intensity of the current temperature measurement point is as follows:

6. The method for self-adapting temperature measurement based on infrared detector parameters according to claim 5, characterized in that, In the above formula, Ci and Cj are radiation intensity-temperature curves corresponding to the two integration time sampling points near the current integration time; β1 and β2 are weights of the curve Ci and the curve Cj, respectively; Ci(Y16) and Cj(Y16) are temperature values of the current temperature measurement point radiation intensity inquired in the curve Ci and the curve Cj, respectively. Temp = β1 * C i (Y16) + β2 * C j (Y16) ​ 7. The method of claim 6, wherein the step of determining the temperature of the infrared detector is based on a parameter of the infrared detector. The weights β1 and β2 of the curve Ci and the curve Cj are determined according to the proximity of the integral time sampling point corresponding to the curve Ci and the curve Cj to the current integral time, and the closer the integral time sampling point corresponding to a curve to the current integral time, the higher the weight of the curve.

8. The method of claim 1, wherein the infrared detector parameter adaptive temperature measurement method is characterized by, If the difference between the radiation response difference of the current infrared image and the preset optimal radiation response difference is not less than the threshold after the current integral time is adjusted according to the difference ΔF, it is first determined whether the adjusted current integral time exceeds its linear working interval, and if yes, the current integral time before the adjustment is taken as the final integral time.

9. An electronic device, comprising: The computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the temperature measurement method based on infrared detector parameter self-adaption according to any one of claims 1 to 8 are implemented. 10.A readable storage medium, wherein a computer program is stored in the readable storage medium, and when the computer program is executed by a processor, the steps of the temperature measurement method based on infrared detector parameter self-adaption according to any one of claims 1 to 8 are implemented.

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