Fire behavior determination method and device based on infrared temperature measurement, equipment and medium

Abstract

The embodiment of the invention discloses a fire behavior determination method and device based on infrared temperature measurement, equipment and a medium. The method comprises the following steps: determining position information of a suspected fire in a monitoring area according to an infrared temperature measurement result of an infrared sensor, and determining a first environment temperature of the position of the suspected fire and a second environment temperature of the position of the infrared sensor according to the position information of the suspected fire; correcting an infrared temperature measurement result of the suspected fire position according to a temperature difference between the first environment temperature and the second environment temperature to obtain an environment compensation temperature value of the suspected fire position; and determining a final fire behavior determination result of the suspected fire behavior position information according to the environment compensation temperature value. According to the technical scheme, temperature correction is carried out on the infrared temperature measurement result based on the environment temperature, the adverse effect of the environment temperature on infrared temperature measurement can be reduced, and therefore the fire behavior of the monitoring area can be accurately determined in time.

Description

Technical Field

[0001] The present invention relates to the field of infrared detection technology, and in particular to a method, device, equipment and medium for determining a fire condition based on infrared temperature measurement. Background Art

[0002] With the improvement of safety awareness, people are paying more and more attention to fire problems. Existing fire prevention units use infrared thermal imaging cameras or near-infrared cameras to detect suspected fires in the monitoring area.

[0003] However, in the process of infrared temperature measurement, the ambient temperature is the main factor affecting the accuracy of infrared temperature measurement. Due to the wide area of ​​the monitoring area (such as forests), the infrared camera and the suspected fire location are at different altitudes, resulting in a large difference in the ambient temperature of the infrared camera and the suspected fire location, which in turn leads to a greater deviation in the infrared temperature measurement value of the suspected fire location by the infrared camera. If temperature correction is not performed, the discovery of the suspected fire will be greatly delayed. Summary of the invention

[0004] The present invention provides a fire condition determination method, device, equipment and medium based on infrared temperature measurement, which performs temperature correction on the infrared temperature measurement result based on the ambient temperature, can reduce the adverse effect of the ambient temperature on the infrared temperature measurement, and thus timely and accurately determine the fire condition in the monitoring area.

[0005] According to one aspect of the present invention, a method for determining a fire condition based on infrared temperature measurement is provided, the method comprising:

[0006] Determine the suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and determine the first ambient temperature of the suspected fire location and the second ambient temperature of the location where the infrared sensor is located according to the suspected fire location information;

[0007] Correcting the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain an ambient compensation temperature value of the suspected fire location;

[0008] A final fire determination result of the suspected fire location information is determined according to the environmental compensation temperature value.

[0009] According to another aspect of the present invention, there is provided a fire condition determination device based on infrared temperature measurement, comprising:

[0010] An ambient temperature determination module is used to determine the suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and to determine the first ambient temperature of the suspected fire location according to the suspected fire location information and to determine the second ambient temperature of the location where the infrared sensor is located;

[0011] an environmental compensation temperature value determination module, configured to correct the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature, so as to obtain the environmental compensation temperature value of the suspected fire location;

[0012] The final fire situation result determination module is used to determine the final fire situation determination result of the suspected fire situation location information according to the environmental compensation temperature value.

[0013] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0014] at least one processor; and

[0015] a memory communicatively connected to the at least one processor; wherein,

[0016] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the fire condition determination method based on infrared temperature measurement described in any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the fire condition determination method based on infrared temperature measurement described in any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention determines the suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and determines the first ambient temperature of the suspected fire location and the second ambient temperature of the location where the infrared sensor is located according to the suspected fire location information; corrects the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain the environmental compensation temperature value of the suspected fire location; and determines the final fire determination result of the suspected fire location information according to the environmental compensation temperature value. This technical solution performs temperature correction on the infrared temperature measurement result based on the ambient temperature, which can reduce the adverse effects of the ambient temperature on the infrared temperature measurement, thereby timely and accurately determining the fire condition in the monitoring area.

[0019] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a flow chart of a method for determining a fire condition based on infrared temperature measurement according to Embodiment 1 of the present invention;

[0022] Figure 2 is a schematic diagram of a suspected fire location provided according to Embodiment 1 of the present invention;

[0023] Figure 3 is a schematic diagram of deployment of a temperature sensor provided according to Embodiment 1 of the present invention;

[0024] Figure 4 is a schematic diagram of a temperature comparison curve cluster before compensation provided according to the first embodiment of the present invention;

[0025] Figure 5 is a flow chart of a method for determining fire conditions based on infrared temperature measurement according to Embodiment 2 of the present invention;

[0026] Figure 6 is a structural schematic diagram of a fire condition determination device based on infrared temperature measurement provided according to Embodiment 3 of the present invention;

[0027] Figure 7 The invention is a schematic diagram of the structure of an electronic device for implementing a method for determining a fire condition based on infrared temperature measurement according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", "target", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Embodiment 1

[0031] Figure 1 This is a flow chart of a method for determining a fire condition based on infrared temperature measurement provided in the first embodiment of the present invention. This embodiment can be applied to the situation where the fire condition in the monitoring area is determined by temperature correction of the infrared temperature measurement result based on the ambient temperature. The method can be executed by a fire condition determination device based on infrared temperature measurement. The fire condition determination device based on infrared temperature measurement can be implemented in the form of hardware and / or software. The fire condition determination device based on infrared temperature measurement can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0032] S110, determining suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and determining a first ambient temperature of the suspected fire location and a second ambient temperature of the location where the infrared sensor is located according to the suspected fire location information.

[0033] In this embodiment, when detecting a fire in a monitoring area by using an infrared sensor, it is first necessary to determine the suspected fire location information in the monitoring area based on the infrared temperature measurement results of the infrared sensor. The monitoring area may be a forest area. Optionally, the suspected fire location information in the monitoring area is determined based on the infrared temperature measurement results of the infrared sensor, including: combining the infrared temperature measurement results of the infrared sensor with a pre-configured three-dimensional topographic map, and determining the suspected fire location based on the combined results; determining the suspected fire distance between the infrared sensor deployment position and the suspected fire location based on the infrared sensor deployment position, the pitch angle, and the three-dimensional topographic map as the suspected fire location information; determining the lowest altitude at the infrared sensor deployment position of the infrared sensor; determining the suspected fire altitude based on the altitude between the infrared sensor deployment position and the lowest altitude, the suspected fire distance, and the pitch angle as the suspected fire location information.

[0034] In this embodiment, a three-dimensional topographic map can be pre-configured for the detection area of ​​the infrared sensor based on the satellite positioning information. When determining the suspected fire location information in the monitoring area, the infrared temperature measurement result of the infrared sensor is first combined with the pre-configured three-dimensional topographic map, and the suspected fire location is determined based on the combined result. Then, the suspected fire distance and the suspected fire altitude are determined respectively to determine the suspected fire location information. Among them, the suspected fire distance is the distance between the infrared sensor deployment location and the suspected fire location, and the suspected fire altitude is the altitude between the suspected fire location and the lowest altitude at the infrared sensor deployment location. It should be noted that when the infrared temperature measurement result of the infrared sensor is greater than the preset temperature threshold, the corresponding detection point location can be considered to be the suspected fire location. Among them, the preset temperature threshold can be set according to actual needs, and this embodiment does not make specific limitations on this.

[0035] Figure 2 A schematic diagram of a suspected fire location provided in Example 1 of the present invention. A represents the infrared sensor deployment location of the infrared sensor, B represents the suspected fire location, the line distance of AB is the suspected fire distance, and the AB line continues to extend and eventually intersects with the lowest altitude at the infrared sensor deployment location of the infrared sensor at C; B and D are at the same altitude, and I is the distance between BD; θ represents the pitch angle, that is, the angle between the center line of the infrared sensor and the horizontal line; h0 is the altitude between the infrared sensor deployment location and the lowest altitude, h is the distance between AD, and h0-h represents the suspected fire altitude.

[0036] like Figure 2 As shown, the position B where the line from A to B first encounters the mountain is the suspected fire location. According to the infrared sensor deployment position A, the pitch angle θ and the three-dimensional topographic map, the distance I between BD can be determined, and then the suspected fire distance can be determined as AB = I / cosθ. According to the suspected fire distance AB and the pitch angle θ, the distance between AD can be determined as h = (I / cosθ)*sinθ = I*tgθ, and then according to the distance h between AD and the altitude h0 between the infrared sensor deployment position and the lowest altitude, the suspected fire altitude can be determined as h0-h = h0-I*tgθ. The suspected fire distance AB and the suspected fire altitude h0-h are used as the suspected fire location information.

[0037] Through such a setting, this solution can quickly and accurately determine the location information of suspected fires in the monitoring area with the help of pre-configured three-dimensional terrain maps.

[0038] In this embodiment, after determining the suspected fire location information in the monitoring area, the first ambient temperature of the suspected fire location and the second ambient temperature of the infrared sensor location can be determined based on the suspected fire location information. The first ambient temperature is the ambient temperature of the suspected fire location. The second ambient temperature is the ambient temperature of the infrared sensor location. Specifically, the first ambient temperature can be determined based on the temperature sensors deployed within a certain range near the suspected fire location, and the second ambient temperature can be determined based on the temperature sensors deployed within a certain range near the infrared sensor location. Optionally, at least three temperature sensors are deployed at the infrared sensor deployment position of the infrared sensor, at a ground position corresponding to the infrared sensor deployment position, and between the infrared sensor deployment position and the ground position; accordingly, a first ambient temperature of the suspected fire position is determined according to the suspected fire position information and a second ambient temperature of the position where the infrared sensor is located is determined, including: determining the second ambient temperature according to the measurement value of the temperature sensor at the infrared sensor deployment position; determining whether there is a temperature sensor with a matching position between the infrared sensor deployment position and the ground position according to the suspected fire position information; if so, determining the first ambient temperature according to the measurement value of the matching temperature sensor; otherwise, constructing a relationship function between temperature and altitude according to the measurement value of the temperature sensor and the altitude information of the corresponding deployment position, and determining a reference ambient temperature corresponding to the altitude of the suspected fire position according to the relationship function between temperature and altitude and the altitude of the suspected fire position as the first ambient temperature.

[0039] In this embodiment, since the temperature difference at different altitudes varies greatly, in order to collect the most realistic temperature, temperature sensors can be deployed in advance in the monitoring area according to different temperature layers. For example, temperature sensors can be deployed in multiple places such as sunny, transitional, and shady places. Figure 3 The following is a schematic diagram of the deployment of a temperature sensor provided in the first embodiment of the present invention. In which, O represents the ground position corresponding to the infrared sensor deployment position A, D0-D8 are different temperature sensors, and D0 is deployed at point O, and D8 is deployed at point A. Figure 3 As shown, a temperature sensor can be deployed at every altitude difference from the ground to the tower where the infrared sensor is located, so as to detect temperature values ​​at different altitudes.

[0040] When determining the second ambient temperature at the location of the infrared sensor according to the suspected fire location information, the second ambient temperature can be determined directly according to the measurement value of the temperature sensor at the location where the infrared sensor is deployed, such as Figure 3As shown, the second ambient temperature can be directly determined according to the measured value of D8. When determining the first ambient temperature of the suspected fire location according to the suspected fire location information, since the temperature sensor may not be deployed near the suspected fire location, it is impossible to determine the first ambient temperature according to the temperature sensor near the suspected fire location. In this case, in order to ensure that the first ambient temperature can be obtained, the first ambient temperature can be determined according to the temperature sensors deployed at other locations at the same altitude as the suspected fire location. Specifically, it is first necessary to determine whether there is a temperature sensor with a matching position between the infrared sensor deployment location and the ground location according to the suspected fire location information. Among them, if a temperature sensor is deployed at the same altitude of the suspected fire location, it is considered that there is a temperature sensor matching the suspected fire location between the infrared sensor deployment location and the ground location. If it is determined according to the suspected fire location information that there is a temperature sensor with a matching position between the infrared sensor deployment location and the ground location, the first ambient temperature can be directly determined according to the measured value of the matching temperature sensor. It should be noted that since there may be a fire at the suspected fire location, which causes the temperature measured by the temperature sensor to rise, in order to ensure the measurement accuracy of the first ambient temperature, the historical measurement value of the temperature sensor with a matching position can be searched, and the measured temperature before the temperature rise can be found as the first ambient temperature of the suspected fire location.

[0041] If it is determined based on the suspected fire location information that there is no temperature sensor that matches the position of the infrared sensor deployment location and the ground location, it is necessary to construct a temperature-altitude relationship function based on the temperature sensor's measurement value and the altitude information of the corresponding deployment location, and determine the reference ambient temperature corresponding to the altitude of the suspected fire location as the first ambient temperature based on the temperature-altitude relationship function and the altitude of the suspected fire location. Exemplarily, the temperature-altitude relationship function can be expressed as T=t(t0,h x ), where T is the temperature of the temperature sensor, and t0 represents the temperature sensor at the ground position corresponding to the infrared sensor deployment position (see Figure 3 The temperature measured at D0, h x is the altitude of the location where the temperature is to be calculated. For example, the relationship function between temperature and altitude can be T = 15.04-0.00649h x After the relationship function between temperature and altitude is constructed, the altitude of the suspected fire location can be substituted into the relationship function between temperature and altitude to determine the first ambient temperature of the suspected fire location.

[0042] Furthermore, based on the environment type of the suspected fire location (for example, sunny), a temperature sensor with the same environment type (sunny) can be selected from all deployed temperature sensors as a candidate temperature sensor, and a relationship function between temperature and altitude under the environment type (sunny) can be constructed based on the measurement value of the candidate temperature sensor and the altitude information of the corresponding deployment location. Then, the first ambient temperature can be determined based on the relationship function between temperature and altitude and the altitude of the suspected fire location, thereby improving the accuracy of the first ambient temperature.

[0043] Through such an arrangement, the present solution can quickly and accurately determine the first ambient temperature and the second ambient temperature by deploying temperature sensors at the infrared sensor deployment position of the infrared sensor, the ground position corresponding to the infrared sensor deployment position, and between the infrared sensor deployment position and the ground position.

[0044] S120, correcting the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain an environmental compensation temperature value of the suspected fire location.

[0045] In this embodiment, after determining the first ambient temperature and the second ambient temperature, the infrared temperature measurement result of the suspected fire location can be corrected according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain the environmental compensation temperature value of the suspected fire location. Wherein, the environmental compensation temperature value may refer to the corrected temperature of the suspected fire location obtained after correcting the infrared temperature measurement result of the suspected fire location based on the ambient temperature. Optionally, correcting the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain the environmental compensation temperature value of the suspected fire location includes: determining at least one intermediate ambient temperature between the first ambient temperature and the second ambient temperature based on a preset temperature difference interval; constructing an initial temperature compensation model according to the second ambient temperature and the infrared temperature measurement result corresponding to the second ambient temperature, and determining the initial environmental compensation temperature value according to the initial temperature compensation model; based on the initial environmental compensation temperature value, constructing an intermediate temperature compensation model according to the intermediate ambient temperature and the intermediate ambient compensation temperature value corresponding to the intermediate ambient temperature in turn, and determining the intermediate ambient compensation temperature value corresponding to the next intermediate ambient temperature according to the intermediate temperature compensation model, until the environmental compensation temperature value corresponding to the first ambient temperature is determined.

[0046] The preset temperature difference interval may refer to a preset temperature difference interval, which may be set according to actual needs, and this embodiment does not specifically limit this. For example, the preset temperature difference interval may be set to 1 degree. The intermediate ambient temperature may refer to an ambient temperature between the first ambient temperature and the second ambient temperature that satisfies the preset temperature difference interval. The temperature compensation model may be used to perform temperature correction on the infrared temperature measurement results of the suspected fire location. For example, the initial temperature compensation model may be expressed as , where y1 is the initial environmental compensation temperature value, T0 is the second environmental temperature, and y0 is the infrared temperature measurement result corresponding to the second environmental temperature.

[0047] It should be noted that the same target temperature has different corresponding temperature compensation models under different ambient temperatures and measured temperatures. Therefore, the corresponding temperature compensation model can be found through the ambient temperature and measured temperature, so as to calculate the target temperature under the ambient temperature. Figure 2 For example, the purpose of this embodiment is to find the ambient temperature T corresponding to point D. D The target temperature under the same altitude is used as the ambient compensation temperature value of point B at the same altitude. D With T A When the difference between (the ambient temperature corresponding to point A) is greater than the preset temperature difference interval, it is necessary to switch to one or more temperature compensation models for temperature compensation. It can be understood that the infrared radiation from point B passes through x stratospheres (the larger the x, the smaller the temperature difference between adjacent stratospheres), and the ambient temperature changes from T D Transition to T A , calculate the influence of ambient temperature on the measured temperature value in each stratosphere, and accumulate the influence of x stratospheres to get the influence of the final ambient temperature on the infrared radiation of point B. The infrared radiation of point B changes from the ambient temperature T D Gradually transition to ambient temperature T A Finally, the infrared radiation is detected by the infrared sensor at A and the temperature value is obtained.

[0048] In this embodiment, in order to obtain the true temperature measurement value, it is necessary to correct the infrared temperature measurement result y0 corresponding to the second ambient temperature. Specifically, the preset temperature difference interval is set to Δt, from the ambient temperature T A At the beginning, the measured temperature value y0 is gradually corrected until it is corrected to the ambient temperature T D , that is, the ambient compensation temperature output by the previous temperature compensation model is used as part of the input of the next temperature compensation model. Among them, the smaller Δt is, the lower the error introduced is, and it satisfies T A ≤T D .

[0049] Assume T A +(n-1)Δt≤T D ≤T A +nΔt, then:

[0050] T0=T A ,

[0051] T n =T0+nΔt,

[0052]

[0053]

[0054] …

[0055]

[0056]

[0057] in, is the true temperature (i.e. the ambient compensation temperature value) n+1 and ambient temperature T n The temperature compensation model is as follows. For example, It can be expressed as follows:

[0058] y1=y0–k 11 T0 3 +k 12 T0 2 –k 13 T0+k 14 ,

[0059] …

[0060] y n+1 =y n –k n1 T n 3 +k n2 T n 2 –k n3 T n +k n4 .

[0061] From this we can get:

[0063] y n+1 =y n –k n1 (T0+nΔt) 3 +k n2 (T0+nΔt) 2 –k n3 (T0+

[0064] nΔt)+k n4 Among them, k n1 -k n4is a constant pre-calibrated by experiments.

[0065] Through such a setting, the present scheme can perform temperature correction on the infrared temperature measurement results of the suspected fire location based on the constructed temperature compensation model, thereby improving the accuracy of the environmental compensation temperature value corresponding to the first ambient temperature.

[0066] S130, determining a final fire determination result of the suspected fire location information according to the environmental compensation temperature value.

[0067] In this embodiment, after the infrared temperature measurement result of the suspected fire location is temperature corrected to obtain the environmental compensation temperature value of the suspected fire location, the final fire determination result of the suspected fire location information can be determined based on the environmental compensation temperature value. Specifically, if the environmental compensation temperature value is greater than the preset temperature threshold, it can be determined that there is a fire at the suspected fire location; if the environmental compensation temperature value is less than or equal to the preset temperature threshold, it can be determined that there is no fire at the suspected fire location. Furthermore, when it is determined that there is a fire at the suspected fire location, an alarm can be immediately initiated so that management personnel can handle the fire in a timely manner.

[0068] The technical solution of the embodiment of the present invention determines the suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and determines the first ambient temperature of the suspected fire location and the second ambient temperature of the location where the infrared sensor is located according to the suspected fire location information; corrects the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain the environmental compensation temperature value of the suspected fire location; and determines the final fire determination result of the suspected fire location information according to the environmental compensation temperature value. This technical solution performs temperature correction on the infrared temperature measurement result based on the ambient temperature, which can reduce the adverse effects of the ambient temperature on the infrared temperature measurement, thereby timely and accurately determining the fire condition in the monitoring area.

[0069] In this embodiment, optionally, before determining the ambient compensation temperature value corresponding to the first ambient temperature, the method further includes: determining whether the temperature difference between the first ambient temperature and its corresponding adjacent intermediate ambient temperature is equal to a preset temperature difference interval; if not, constructing a temperature compensation function based on all intermediate ambient temperatures and the corresponding intermediate ambient compensation temperature values; and determining the ambient compensation temperature value corresponding to the first ambient temperature based on the temperature compensation function and the first ambient temperature.

[0070] In this embodiment, before determining the environmental compensation temperature value corresponding to the first ambient temperature, it is also possible to determine whether the temperature difference between the first ambient temperature and the corresponding adjacent intermediate ambient temperature is equal to the preset temperature difference interval, and determine the environmental compensation temperature value corresponding to the first ambient temperature according to the judgment result. Specifically, if they are equal, the environmental compensation temperature value corresponding to the first ambient temperature can be directly determined according to the temperature compensation model; if they are not equal, it is necessary to construct a temperature compensation function according to all the intermediate ambient temperatures and the corresponding intermediate ambient compensation temperature values, and then determine the environmental compensation temperature value corresponding to the first ambient temperature according to the temperature compensation function and the first ambient temperature.

[0071] For example, due to T D In the interval [T A +(n-1)Δt,T A +nΔt], so we need to further find T D Specifically, based on the above calculation result set (y i , T i ), a temperature compensation function y=h(T) of the compensation value y and the ambient temperature T can be constructed. Wherein, i ranges from 1 to n.

[0072] In this embodiment, optionally, a temperature compensation function is constructed based on all intermediate ambient temperatures and corresponding intermediate ambient compensation temperature values, including: determining that the function expression of the temperature compensation function is a polynomial function based on the change relationship between all intermediate ambient temperatures and the corresponding intermediate ambient compensation temperature values; determining the polynomial fitting parameters in the polynomial function based on all intermediate ambient temperatures and the corresponding intermediate ambient compensation temperature values; and determining the temperature compensation function based on the polynomial fitting parameters.

[0073] Figure 4 Schematic diagram of a temperature comparison curve cluster before compensation provided by the first embodiment of the present invention. Figure 4 It can be seen that y=h() is a convergent function. As the ambient temperature increases, the compensation value y decreases slowly and monotonically. Therefore, the temperature compensation function between the compensation value y and the ambient temperature T can be constructed according to the principle of least squares method. Among them, the least squares method fits the most suitable function expression by minimizing the sum of squared errors. The least squares method can fit many types of functions, such as polynomial functions, exponential functions, sine functions, etc. Figure 4 It can be found that the relationship between the compensation value y and the ambient temperature T decreases in a curve, so the type of temperature compensation function can be determined as a polynomial function, which can be specifically expressed as Among them, f(t) is the compensation value y, t is the ambient temperature, k determines the polynomial fitting order, a i are the polynomial fitting coefficients of the fitting.

[0074] Considering the processing speed of the computer, the order of t should not be too high, but the error must not be too large. After multivariate function extreme value calculation, matrix operation and other operations, the polynomial fitting coefficient can be finally solved, and the temperature compensation function between the compensation value y and the ambient temperature T is obtained as follows:

[0075] Where m is the polynomial fitting order.

[0076] After the temperature compensation function is constructed, T D Substituting into y = h(T), we can find T D The corresponding ambient compensation temperature value.

[0077] Through such an arrangement, the present solution adopts different methods to determine the environmental compensation temperature value corresponding to the first ambient temperature based on the judgment result of whether the temperature difference between the first ambient temperature and its corresponding adjacent intermediate ambient temperature is equal to the preset temperature difference interval, thereby improving the accuracy of the environmental compensation temperature value.

[0078] Embodiment 2

[0079] Figure 5 A flow chart of a fire determination method based on infrared temperature measurement is provided for the second embodiment of the present invention, and this embodiment is optimized based on the above embodiment. The specific optimization is as follows: the suspected fire location information includes the suspected fire distance between the infrared sensor deployment position and the suspected fire location; accordingly, before determining the final fire determination result of the suspected fire location information according to the environmental compensation temperature value, the method further includes: determining a corresponding temperature distance compensation model according to the suspected fire distance and the infrared temperature measurement results of the suspected fire location; determining the distance compensation temperature value according to the temperature distance compensation model; and determining the final fire determination result of the suspected fire location information according to the environmental compensation temperature value and the distance compensation temperature value.

[0080] like Figure 5 As shown, the method of this embodiment specifically includes the following steps:

[0081] S210, determining suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and determining a first ambient temperature of the suspected fire location and a second ambient temperature of the location of the infrared sensor according to the suspected fire location information.

[0082] Among them, the suspected fire location information includes the suspected fire distance between the infrared sensor deployment location and the suspected fire location.

[0083] S220, correcting the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain an environmental compensation temperature value of the suspected fire location.

[0084] Among them, the specific implementation method of S210-S220 can refer to the detailed description of S110-S120, which will not be repeated here.

[0085] S230, determining a corresponding temperature distance compensation model according to the infrared temperature measurement results of the suspected fire distance and the suspected fire position.

[0086] It should be noted that in addition to ambient temperature, distance also has a great influence on infrared temperature measurement. The farther the distance, the greater the deviation of the temperature measurement value. Therefore, it is also necessary to correct the infrared temperature measurement results in combination with the distance in order to further improve the accuracy of the infrared temperature measurement results. After determining the suspected fire location information in the monitoring area, the corresponding temperature distance compensation model can be determined according to the suspected fire distance and the infrared temperature measurement results of the suspected fire location.

[0087] Exemplarily, the temperature distance compensation model can be expressed as y=f(x,y0). Wherein, y represents the compensated temperature (i.e., the distance compensated temperature value), y0 is the infrared temperature measurement value (i.e., the infrared temperature measurement result), and x is the temperature measurement distance (i.e., the suspected fire distance). It should be noted that different heat source temperatures correspond to different temperature distance compensation models, where the heat source temperature can be determined based on the suspected fire distance x and the infrared temperature measurement result y0 of the suspected fire location.

[0088] Exemplarily, the temperature distance compensation model with a heat source temperature of 460K can be expressed as:

[0089] y=y0+148.1916–44.6229e -0.2009x , where x>20m.

[0090] Exemplarily, the temperature distance compensation model with a heat source temperature of 505K can be expressed as:

[0091] y=y0+189.4307–185.7308e -0.2009x , where x>20m.

[0092] S240: Determine a distance compensation temperature value according to a temperature distance compensation model.

[0093] In this embodiment, after determining the corresponding temperature distance compensation model, the distance compensation temperature value can be determined according to the temperature distance compensation model. The distance compensation temperature value may refer to the temperature value obtained after correcting the infrared temperature measurement result of the suspected fire location by the temperature distance compensation model. Figure 2 Taking as an example, the suspected fire distance I / cosθ is substituted into the temperature distance compensation model corresponding to AB and y0, and the output result of the temperature distance compensation model is the distance compensated temperature value.

[0094] S250, determining a final fire determination result of the suspected fire location information according to the environment compensation temperature value and the distance compensation temperature value.

[0095] In this embodiment, after respectively determining the environmental compensation temperature value and the distance compensation temperature value, the final fire determination result of the suspected fire location information can be further determined based on the environmental compensation temperature value and the distance compensation temperature value. It should be noted that the correction order based on the environmental temperature and distance is not limited in this embodiment, and can be set according to actual needs. If the environmental temperature correction is performed first, the environmental compensation temperature value obtained after the environmental temperature correction needs to be used as the input parameter of the distance correction for distance correction; correspondingly, if the distance correction is performed first, the distance compensation temperature value obtained after the distance correction needs to be used as the input parameter of the environmental temperature correction for environmental temperature correction. If the compensated temperature value after the environmental temperature correction and the distance correction is greater than the preset temperature threshold, it can be determined that there is a fire at the suspected fire location, and an alarm can be issued immediately at this time so that the management personnel can deal with the fire in time.

[0096] The technical solution of the embodiment of the present invention determines the corresponding temperature distance compensation model according to the suspected fire distance and the infrared temperature measurement results of the suspected fire location before determining the final fire determination result of the suspected fire location information according to the environmental compensation temperature value; determines the distance compensation temperature value according to the temperature distance compensation model; and determines the final fire determination result of the suspected fire location information according to the environmental compensation temperature value and the distance compensation temperature value. This technical solution performs temperature correction on the infrared temperature measurement results based on the ambient temperature and distance, which can reduce the adverse effects of the ambient temperature and distance on the infrared temperature measurement, thereby more timely and accurately determining the fire situation in the monitoring area.

[0097] Embodiment 3

[0098] Figure 6 This is a schematic diagram of the structure of a fire condition determination device based on infrared temperature measurement provided in the third embodiment of the present invention. The device can execute the fire condition determination method based on infrared temperature measurement provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. Figure 6 As shown, the device comprises:

[0099] The ambient temperature determination module 310 is used to determine the suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and determine the first ambient temperature of the suspected fire location according to the suspected fire location information and determine the second ambient temperature of the location where the infrared sensor is located;

[0100] An environment compensation temperature value determination module 320 is used to correct the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain the environment compensation temperature value of the suspected fire location;

[0101] The final fire condition result determination module 330 is used to determine the final fire condition determination result of the suspected fire position information according to the environmental compensation temperature value.

[0102] Optionally, the environment compensation temperature value determination module 320 includes:

[0103] an intermediate ambient temperature determining unit, configured to determine at least one intermediate ambient temperature between the first ambient temperature and the second ambient temperature based on a preset temperature difference interval;

[0104] an initial environment compensation temperature value determining unit, configured to construct an initial temperature compensation model according to the second environment temperature and an infrared temperature measurement result corresponding to the second environment temperature, and determine an initial environment compensation temperature value according to the initial temperature compensation model;

[0105] The first environmental compensation temperature value determination unit is used to construct an intermediate temperature compensation model based on the initial environmental compensation temperature value, in turn according to the intermediate ambient temperature and the intermediate ambient compensation temperature value corresponding to the intermediate ambient temperature, and determine the intermediate ambient compensation temperature value corresponding to the next intermediate ambient temperature according to the intermediate temperature compensation model until the environmental compensation temperature value corresponding to the first ambient temperature is determined.

[0106] Optionally, the environment compensation temperature value determination module 320 further includes:

[0107] an ambient temperature difference judgment unit, used to determine whether the temperature difference between the first ambient temperature and its corresponding adjacent intermediate ambient temperature is equal to the preset temperature difference interval before determining the ambient compensation temperature value corresponding to the first ambient temperature;

[0108] a temperature compensation function building unit, for building a temperature compensation function according to all intermediate environment temperatures and corresponding intermediate environment compensation temperature values ​​if they are not equal;

[0109] The second environment compensation temperature value determining unit is used to determine the environment compensation temperature value corresponding to the first environment temperature according to the temperature compensation function and the first environment temperature.

[0110] Optionally, the temperature compensation function construction unit is used to:

[0111] Determining that the function expression of the temperature compensation function is a polynomial function according to the change relationship between all intermediate environment temperatures and the corresponding intermediate environment compensation temperature values;

[0112] Determine the polynomial fitting parameters in the polynomial function according to all the intermediate environment temperatures and the corresponding intermediate environment compensation temperature values;

[0113] The temperature compensation function is determined according to the polynomial fitting parameters.

[0114] Optionally, at least three temperature sensors are deployed at an infrared sensor deployment position of the infrared sensor, a ground position corresponding to the infrared sensor deployment position, and between the infrared sensor deployment position and the ground position;

[0115] Accordingly, the ambient temperature determination module 310 is used to:

[0116] determining the second ambient temperature according to a measurement value of a temperature sensor at a location where the infrared sensor is deployed;

[0117] Determine, based on the suspected fire location information, whether there is a temperature sensor with a matching position between the infrared sensor deployment position and the ground position;

[0118] If yes, determining the first ambient temperature according to the measurement value of the matched temperature sensor;

[0119] Otherwise, a temperature-altitude relationship function is constructed based on the measurement value of the temperature sensor and the altitude information of the corresponding deployment location, and a reference ambient temperature corresponding to the altitude of the suspected fire location is determined based on the temperature-altitude relationship function and the altitude of the suspected fire location as the first ambient temperature.

[0120] Optionally, the ambient temperature determination module 310 is further configured to:

[0121] combining the infrared temperature measurement result of the infrared sensor with a pre-configured three-dimensional topographic map, and determining the suspected fire location according to the combined result;

[0122] Determine the suspected fire distance between the infrared sensor deployment position and the suspected fire position as suspected fire position information according to the infrared sensor deployment position, the pitch angle and the three-dimensional terrain map;

[0123] determining a minimum altitude at an infrared sensor deployment location of the infrared sensor;

[0124] The suspected fire altitude is determined according to the altitude between the infrared sensor deployment position and the minimum altitude, the suspected fire distance and the pitch angle as the suspected fire location information.

[0125] Optionally, the suspected fire location information includes a suspected fire distance between the infrared sensor deployment location and the suspected fire location;

[0126] Accordingly, the device further comprises:

[0127] a temperature distance compensation model determination module, for determining a corresponding temperature distance compensation model according to the suspected fire distance and the infrared temperature measurement result of the suspected fire location before determining the final fire determination result of the suspected fire location information according to the environmental compensation temperature value;

[0128] A distance compensation temperature value determination module, used to determine the distance compensation temperature value according to the temperature distance compensation model;

[0129] The second final fire condition result determination module is used to determine the final fire condition determination result of the suspected fire position information according to the environment compensation temperature value and the distance compensation temperature value.

[0130] A fire condition determination device based on infrared temperature measurement provided in an embodiment of the present invention can execute a fire condition determination method based on infrared temperature measurement provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0131] Embodiment 4

[0132] Figure 7 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0133] like Figure 7As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0134] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0135] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a fire determination method based on infrared temperature measurement.

[0136] In some embodiments, the fire determination method based on infrared temperature measurement can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the fire determination method based on infrared temperature measurement described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the fire determination method based on infrared temperature measurement in any other appropriate manner (for example, by means of firmware).

[0137] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0138] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0139] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0140] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0141] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0142] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0143] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0144] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining fire conditions based on infrared temperature measurement, characterized in that: The method comprises: Determine the suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and determine the first ambient temperature of the suspected fire location and the second ambient temperature of the location where the infrared sensor is located according to the suspected fire location information; Correcting the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain an ambient compensation temperature value of the suspected fire location; A final fire determination result of the suspected fire location information is determined according to the environmental compensation temperature value.

2. The method according to claim 1, characterized in that Correcting the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature to obtain the environmental compensation temperature value of the suspected fire location includes: determining at least one intermediate ambient temperature between the first ambient temperature and the second ambient temperature based on a preset temperature difference interval; constructing an initial temperature compensation model according to the second ambient temperature and an infrared temperature measurement result corresponding to the second ambient temperature, and determining an initial ambient compensation temperature value according to the initial temperature compensation model; Based on the initial environmental compensation temperature value, an intermediate temperature compensation model is constructed in turn according to the intermediate ambient temperature and the intermediate ambient compensation temperature value corresponding to the intermediate ambient temperature, and the intermediate ambient compensation temperature value corresponding to the next intermediate ambient temperature is determined according to the intermediate temperature compensation model until the environmental compensation temperature value corresponding to the first ambient temperature is determined.

3. The method according to claim 2, characterized in that Before determining the environment compensation temperature value corresponding to the first environment temperature, the method further includes: Determining whether the temperature difference between the first ambient temperature and its corresponding adjacent intermediate ambient temperature is equal to the preset temperature difference interval; If not equal, construct a temperature compensation function according to all intermediate ambient temperatures and corresponding intermediate ambient compensation temperature values; An environment compensation temperature value corresponding to the first environment temperature is determined according to the temperature compensation function and the first environment temperature.

4. The method according to claim 3, characterized in that A temperature compensation function is constructed based on all intermediate ambient temperatures and corresponding intermediate ambient compensation temperature values, including: Determining that the function expression of the temperature compensation function is a polynomial function according to the change relationship between all intermediate environment temperatures and the corresponding intermediate environment compensation temperature values; Determine the polynomial fitting parameters in the polynomial function according to all the intermediate environment temperatures and the corresponding intermediate environment compensation temperature values; The temperature compensation function is determined according to the polynomial fitting parameters.

5. The method according to claim 1, characterized in that deploying at least three temperature sensors at an infrared sensor deployment position of the infrared sensor, a ground position corresponding to the infrared sensor deployment position, and between the infrared sensor deployment position and the ground position; Accordingly, determining the first ambient temperature of the suspected fire location and determining the second ambient temperature of the location of the infrared sensor according to the suspected fire location information includes: determining the second ambient temperature according to a measurement value of a temperature sensor at a location where the infrared sensor is deployed; Determine, based on the suspected fire location information, whether there is a temperature sensor with a matching position between the infrared sensor deployment position and the ground position; If yes, determining the first ambient temperature according to the measurement value of the matched temperature sensor; Otherwise, a temperature-altitude relationship function is constructed based on the measurement value of the temperature sensor and the altitude information of the corresponding deployment location, and a reference ambient temperature corresponding to the altitude of the suspected fire location is determined based on the temperature-altitude relationship function and the altitude of the suspected fire location as the first ambient temperature.

6. The method according to claim 1, characterized in that The suspected fire location information in the monitoring area is determined based on the infrared temperature measurement results of the infrared sensor, including: combining the infrared temperature measurement result of the infrared sensor with a pre-configured three-dimensional topographic map, and determining the suspected fire location according to the combined result; Determine the suspected fire distance between the infrared sensor deployment position and the suspected fire position as suspected fire position information according to the infrared sensor deployment position, the pitch angle and the three-dimensional terrain map; determining a minimum altitude at an infrared sensor deployment location of the infrared sensor; The suspected fire altitude is determined according to the altitude between the infrared sensor deployment position and the minimum altitude, the suspected fire distance and the pitch angle as the suspected fire location information.

7. The method according to claim 1, characterized in that The suspected fire location information includes the suspected fire distance between the infrared sensor deployment location and the suspected fire location; Accordingly, before determining the final fire determination result of the suspected fire location information according to the environmental compensation temperature value, the method further includes: Determine a corresponding temperature distance compensation model according to the suspected fire distance and the infrared temperature measurement result of the suspected fire location; Determining a distance compensation temperature value according to the temperature distance compensation model; A final fire determination result of the suspected fire location information is determined according to the environment compensated temperature value and the distance compensated temperature value.

8. A fire condition determination device based on infrared temperature measurement, characterized in that: The device comprises: An ambient temperature determination module is used to determine the suspected fire location information in the monitoring area according to the infrared temperature measurement result of the infrared sensor, and to determine the first ambient temperature of the suspected fire location according to the suspected fire location information and to determine the second ambient temperature of the location where the infrared sensor is located; an environmental compensation temperature value determination module, configured to correct the infrared temperature measurement result of the suspected fire location according to the temperature difference between the first ambient temperature and the second ambient temperature, so as to obtain the environmental compensation temperature value of the suspected fire location; The final fire situation result determination module is used to determine the final fire situation determination result of the suspected fire situation location information according to the environmental compensation temperature value.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the fire condition determination method based on infrared temperature measurement described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the fire condition determination method based on infrared temperature measurement described in any one of claims 1 to 7 when executed.

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