CN113554845A - Be used for forest fire prevention thermal imaging device - Google Patents
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Abstract
The invention discloses a thermal imaging device for forest fire prevention, which comprises: the device comprises a collecting module, an analyzing module and an analyzing module, wherein the collecting module is used for collecting a thermal image, a current image, an environmental temperature value and a current wind direction of a target forest, the analyzing module is used for obtaining a suspicious high-temperature point in the target forest on the thermal image, obtaining the position of the suspicious high-temperature point belonging to a fire point on the current image and generating an alarm instruction, the analyzing module is further used for analyzing the flame trend of the corresponding fire point based on the current wind direction after the target forest fires, and the alarming module is used for opening an alarm based on the alarm instruction and simultaneously transmitting the flame trend of the fire point to a specified terminal for displaying.
Description
Technical Field
The invention relates to the field of thermal imaging, in particular to a thermal imaging device for forest fire prevention.
Background
In recent years, forest fire incidents occur frequently in China, so that large-area natural resources are destroyed once, the conventional fire protection devices generally comprise two methods, one method is to detect smoke and temperature of the forest and further judge whether the forest fires, the other method is to collect images of the forest and further analyze whether burning flames exist in the forest, the two methods can detect whether the forest fires, but potential fire hazards are difficult to detect, such as unburnt cigarette ends and the like, and thus, the device which can detect whether the forest fires or not and can detect the high-temperature points which do not fire is very important.
The invention is improved on the second fire protection device, the thermal image and the current image of the forest in the monitoring area are displayed on the mobile terminal, the fire point in the forest is synchronously analyzed, if the forest meets the high temperature point, the fire-extinguishing personnel is informed to extinguish the high temperature point in time, the flame trend can be analyzed through the current environmental condition of the forest, the information of each fire point is provided for the fire-extinguishing personnel, and the fire-extinguishing personnel can be helped to finish the fire-extinguishing work within the effective time.
Disclosure of Invention
The invention provides a forest fire prevention thermal imaging device which is used for analyzing the high-temperature points in forests and the flame trend of fire ignition points by utilizing image processing.
The invention provides a thermal imaging device for forest fire prevention, which comprises:
the acquisition module is used for acquiring a thermal image, a current image, an environmental temperature value and a current wind direction of a target forest;
the analysis module is used for acquiring suspicious high-temperature points in the target forest on the thermal image, acquiring the positions of the suspicious high-temperature points belonging to the fire point on the current image and generating an alarm instruction;
the analysis module is also used for analyzing the flame trend corresponding to the fire point based on the current wind direction of the target forest after the fire;
and the alarm module is used for starting an alarm based on the alarm instruction and transmitting the flame trend of the fire point to a specified terminal for displaying.
In one way that can be achieved,
the collection module comprises:
the image acquisition unit is used for acquiring a thermal image and a current image of the target forest;
the temperature acquisition unit is used for acquiring an environmental temperature value of a target forest;
and the wind direction acquisition unit is used for acquiring the current wind direction of the target forest.
In one way that can be achieved,
the analysis module is further used for judging whether a shielding foreign matter exists in front of the image acquisition unit or not based on the definition of the current image.
In one way that can be achieved,
the analysis module is further used for acquiring dangerous objects around the corresponding fire point based on the current wind direction of the target forest and the inflammable objects around the fire point.
In one way that can be achieved,
the analysis module further comprises:
an image processing unit for respectively obtaining the corresponding gray value of each pixel point of the current image,
the analysis unit is used for extracting pixel points with gray values higher than a preset gray value from the current image, and when the number of the extracted pixel points is larger than a preset number, the fact that shielding foreign matters exist in front of the image acquisition unit is determined;
the analysis unit is further used for generating a processing instruction, acquiring the position of the extracted pixel point on the current image, acquiring the position of the foreign matter shielding the image acquisition unit, and transmitting the position to the mobile terminal for displaying.
In one way that can be achieved,
the analysis module comprises:
the image processing unit is also used for extracting pixel points containing target forest ground on the thermal image and connecting to obtain a ground thermal image;
the image processing unit is also used for dividing the ground thermal image into detection grids with preset sizes and respectively acquiring thermal radiation corresponding to each detection grid;
the analysis unit is further used for extracting a first detection grid with heat radiation higher than first preset heat radiation at the current environmental temperature based on the environmental temperature of the target forest, and defining the first detection grid as a first suspicious high-temperature point based on the position on the ground thermal image;
the analysis unit is also used for acquiring the rest part of the thermal image except the ground thermal image, and the rest part of the thermal image is defined as a tree thermal image;
the analysis unit is further used for extracting an area with heat radiation higher than second preset heat radiation at the current ambient temperature on the tree thermal image based on the ambient temperature of the target forest, and the area is defined as a second suspicious high-temperature point;
the first suspicious high-temperature point and the second suspicious high-temperature point are collectively called as suspicious high-temperature points;
the image processing unit is further configured to obtain a position of the suspicious high temperature point on the current image;
the analysis unit is further configured to obtain a first pixel around each suspicious high-temperature point on the current image, obtain a first gray value corresponding to the first pixel and a remote gray value having a preset distance from the high-temperature point in a distributed manner, and determine whether there is a suspicious high-temperature point where a difference between each first gray value and the corresponding remote gray value is greater than a preset difference;
if yes, determining that the corresponding suspicious high-temperature point belongs to a class of ignition points;
the analysis unit is further configured to remove the class of fire points from the current image, convert the current image into an RGB domain, and obtain RGB values corresponding to each remaining suspicious high-temperature point;
the analysis unit is further used for drawing an RGB value histogram of the remaining suspicious high-temperature points and judging whether the remaining suspicious high-temperature points with R values larger than a preset value exist or not;
if yes, determining that the suspicious high-temperature point with the pixel brightness outside the preset range belongs to a second class fire point;
wherein the first class fire point and the second class fire point are collectively called as fire points;
and acquiring the position of a fire point, and generating an alarm instruction.
In one way that can be achieved,
the analysis unit includes:
the acquisition block is used for acquiring the environmental thermal radiation of the target forest according to the environmental temperature acquired by the temperature acquisition unit;
a generation block for generating an environmental thermal image based on the environmental thermal radiation;
a synthesis block for eliminating the ambient thermal radiation contained on the terrestrial thermal image using the ambient thermal image, extracting a first detection grid on the terrestrial thermal image having a thermal radiation higher than a first preset thermal radiation;
the analysis unit is further used for acquiring a region, on the tree thermal image, of which the heat radiation is higher than a preset second heat radiation.
In one way that can be achieved,
the analysis module further comprises:
the analysis unit is further used for acquiring the downwind direction of each ignition point based on the current wind direction, and acquiring first images of all objects downwind from the ignition points on the current image;
the image processing unit is further used for traversing the first image by using a preset trunk color and respectively extracting the position of the inflammable object in the downwind direction of each ignition point;
the control unit is used for controlling the image acquisition unit to acquire a next frame image of the current image;
the image processing unit is further configured to obtain brightness of a flame edge pixel corresponding to each ignition point on the next frame of image, and obtain a first flame with highest flame brightness corresponding to each ignition point;
the image processing unit is further configured to cover each of the ignition points with a first rectangular frame on the current image, and simultaneously cover each of the ignition points with a second rectangular frame on the same position of the next frame of image;
the image processing unit is further configured to, when an uncovered ignition point exists on the next frame of image, respectively cover each corresponding ignition point by using an oval frame, and define the ignition point as a newly added ignition point;
the image processing unit is further used for respectively placing the image contained in the first rectangular frame, the image contained in the second rectangular frame and the image contained in the oval frame in preset images to define the images as flame images;
filling an image contained in a first rectangular frame with a first preset color, and filling an image contained in a second rectangular frame and an image contained in an elliptical frame with a second preset color on the flame image;
the analysis unit is further configured to obtain a flame growth area corresponding to each ignition point on the flame image based on a first rectangular frame area and a second rectangular frame area at the same position on the current image and the next frame image, determine a flame spread speed corresponding to the ignition point, and calculate a time length for the first flame to spread to the inflammable object according to a distance between the first flame and the inflammable object;
meanwhile, acquiring the inflammable objects with the spread duration less than the preset duration, and defining the inflammable objects as dangerous objects;
the analysis unit is further used for respectively obtaining the flame height of each ignition point on the flame image, determining the flame intensity of the corresponding ignition point, and meanwhile determining that all objects around the ignition point with the strongest flame intensity belong to dangerous objects;
the analysis unit is further used for extracting a dangerous area with the highest distribution density of the oval frame and determining that all inflammable objects contained in the dangerous area belong to dangerous objects;
the analysis module is further used for acquiring the dangerous objects downwind of the newly-increased fire point;
the analysis module is further used for respectively placing the positions of the dangerous objects in a preset three-dimensional space, generating a suggested putting-out track based on the distribution density of the dangerous objects, and transmitting the suggested putting-out track to a designated terminal for displaying.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a thermal imaging apparatus for forest fire prevention according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an analysis module of a forest fire prevention thermal imaging apparatus according to an embodiment of the present invention;
fig. 3 is a schematic composition diagram of an analysis unit for a forest fire prevention thermal imaging apparatus according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
The embodiment of the invention provides a thermal imaging device for forest fire prevention, which comprises the following components in percentage by weight as shown in figure 1:
the acquisition module is used for acquiring a thermal image, a current image, an environmental temperature value and a current wind direction of a target forest;
the analysis module is used for acquiring suspicious high-temperature points in the target forest on the thermal image, acquiring the positions of the suspicious high-temperature points belonging to the fire point on the current image and generating an alarm instruction;
the analysis module is also used for analyzing the flame trend corresponding to the fire point based on the current wind direction of the target forest after the fire;
and the alarm module is used for starting an alarm based on the alarm instruction and transmitting the flame trend of the fire point to a specified terminal for displaying.
In this example, the suspicious high temperature point represents a high temperature point in the target forest;
in this example, the wind direction represents the direction of air flow in the target forest;
in this example, the flame tendency includes the diffusion velocity and the fire intensity of the flame.
The beneficial effect of above-mentioned design is: through the thermal image of collection and analysis target forest, can in time discover the suspicious high temperature point in the target forest, for the accurate ignition point who acquires the target forest, through current image of analysis and ambient temperature and then obtain the ignition point of target forest to judge the flame trend of ignition point according to current wind direction, in time open the police dispatch newspaper and transmit the flame trend of ignition point to appointed terminal, the personnel of being convenient for put out a fire in time acquire the information, carry out corresponding work of putting out a fire.
Example 2
Based on embodiment 1, a thermal imaging device for forest fire prevention, the collection module includes:
the image acquisition unit is used for acquiring a thermal image and a current image of the target forest;
the temperature acquisition unit is used for acquiring an environmental temperature value of a target forest;
and the wind direction acquisition unit is used for acquiring the current wind direction of the target forest.
In this example, the image acquisition units are thermal cameras and color cameras;
in this example, the temperature acquisition unit is a temperature sensor;
in this example, the wind direction acquisition unit is a wind sensor.
The beneficial effect of above-mentioned design is: the acquisition module is internally provided with different acquisition units for carrying out corresponding acquisition work, so that the phenomenon of shell jamming or transmission disorder when a single module acquires a plurality of information simultaneously is avoided, and the accuracy of the acquisition module is improved to a certain extent.
Example 3
Based on embodiment 1, the thermal imaging device for forest fire prevention comprises:
the analysis module is further used for judging whether a shielding foreign matter exists in front of the image acquisition unit or not based on the definition of the current image.
In this example, the blocking foreign matter includes both foreign matter and rain and snow blocking;
in this example, when the definition of the current image is smaller than the preset definition, it is determined that a blocking foreign object exists in front of the acquisition unit, and when the current image is black, it is determined that the acquisition unit is completely blocked.
The beneficial effect of above-mentioned design is: whether foreign matter shelters from in front of the image acquisition unit is judged by utilizing the definition of the current image, so that the thermal image and the current image of the target forest can be acquired in time, and the phenomenon that the target forest has a serious fire because the thermal image and the current image of the target forest are not acquired due to the sheltering of the foreign matter is avoided.
Example 4
Based on embodiment 1, a thermal imaging device for forest fire prevention, the analysis module further includes:
the analysis module is further used for acquiring dangerous objects around the corresponding fire point based on the current wind direction of the target forest and the inflammable objects around the fire point.
The beneficial effect of above-mentioned design is: the analysis module judges dangerous objects which are easy to be ignited by the ignition points around the ignition points based on the current wind direction of the target forest, guides fire extinguishing personnel to timely process the dangerous objects which are possibly ignited, and avoids further expansion of fire behavior.
Example 5
Based on embodiment 3, a thermal imaging device for forest fire prevention, the analysis module further includes:
an image processing unit for respectively obtaining the corresponding gray value of each pixel point of the current image,
the analysis unit is used for extracting pixel points with gray values higher than a preset gray value from the current image, and when the number of the extracted pixel points is larger than a preset number, the fact that shielding foreign matters exist in front of the image acquisition unit is determined;
the analysis unit is further used for generating a processing instruction, acquiring the position of the extracted pixel point on the current image, acquiring the position of the foreign matter shielding the image acquisition unit, and transmitting the position to the mobile terminal for displaying.
In this example, the processing instruction represents a foreign object cleaning instruction, and belongs to a force instruction.
The beneficial effect of above-mentioned design is: when the foreign matter blocks the image acquisition unit, the position of the foreign matter on the image acquisition unit is conveniently and quickly positioned by a user, the position of the foreign matter on the image acquisition unit is determined by acquiring the position of an abnormal pixel point on a current image, and the foreign matter is transmitted to a terminal for reference of the user.
Example 6
Based on embodiment 3, the device for forest fire prevention thermal imaging includes, as shown in fig. 2:
the image processing unit is also used for extracting pixel points containing target forest ground on the thermal image and connecting to obtain a ground thermal image;
the image processing unit is also used for dividing the ground thermal image into detection grids with preset sizes and respectively acquiring thermal radiation corresponding to each detection grid;
the analysis unit is further used for extracting a first detection grid with heat radiation higher than first preset heat radiation at the current environmental temperature based on the environmental temperature of the target forest, and defining the first detection grid as a first suspicious high-temperature point based on the position on the ground thermal image;
the analysis unit is also used for acquiring the rest part of the thermal image except the ground thermal image, and the rest part of the thermal image is defined as a tree thermal image;
the analysis unit is further used for extracting an area with heat radiation higher than second preset heat radiation at the current ambient temperature on the tree thermal image based on the ambient temperature of the target forest, and the area is defined as a second suspicious high-temperature point;
the first suspicious high-temperature point and the second suspicious high-temperature point are collectively called as suspicious high-temperature points;
the image processing unit is further configured to obtain a position of the suspicious high temperature point on the current image;
the analysis unit is further configured to obtain a first pixel around each suspicious high-temperature point on the current image, obtain a first gray value corresponding to the first pixel and a remote gray value having a preset distance from the high-temperature point in a distributed manner, and determine whether there is a suspicious high-temperature point where a difference between each first gray value and the corresponding remote gray value is greater than a preset difference;
if yes, determining that the corresponding suspicious high-temperature point belongs to a class of ignition points;
the analysis unit is further configured to remove the class of fire points from the current image, convert the current image into an RGB domain, and obtain RGB values corresponding to each remaining suspicious high-temperature point;
the analysis unit is further used for drawing an RGB value histogram of the remaining suspicious high-temperature points and judging whether the remaining suspicious high-temperature points with R values larger than a preset value exist or not;
if yes, determining that the suspicious high-temperature point with the pixel brightness outside the preset range belongs to a second class fire point;
wherein the first class fire point and the second class fire point are collectively called as fire points;
and acquiring the position of a fire point, and generating an alarm instruction.
In this example, the ground thermal image represents a thermal image acquired on the thermal image containing only the target forest ground;
in this example, when the ground thermal image is divided into inspection cells of a predetermined size, if there is a remaining portion of a size less than the predetermined size, the remaining portion is regarded as an inspection cell;
in this example, the first suspect high temperature point represents a suspect high temperature point on the ground;
in this example, the tree thermal image represents a thermal image acquired on the thermal image containing only the target forest trees;
in this example, the second suspect high temperature point represents a suspect high temperature point on the tree;
in this example, the one-type fire point represents a fire point at which smoke has been generated, and the fire is great compared with the two-type fire point;
in this example, the RGB domain represents the expression of an image by red, green, blue;
in this example, the RGB values represent color compositions, where R represents red, G represents green, and B represents blue;
in this example, the second type of ignition point is indicated as the ignition point that generates smoke, e.g., unburned butts, unextinguished ashes;
in this example, when only two types of fire spots exist in the target forest, the word "work can be done by a small number of fire fighting personnel" is displayed on the mobile terminal.
The beneficial effect of above-mentioned design is: because the ground temperature in the forest is different from the tree temperature, the thermal images are divided into the ground thermal image and the tree thermal image, corresponding suspicious high-temperature points are respectively obtained on the two thermal images, the type of the fire point is determined according to the properties of the suspicious high-temperature points, and because one type of fire ignition is large, a fire extinguisher can preferentially put out the fire point with large fire according to the type of the fire point, so that the loss of the target forest is reduced to the minimum within the same time.
Example 7
Based on embodiment 6, an apparatus for forest fire prevention thermal imaging, the analysis unit is shown in fig. 3, and includes:
the acquisition block is used for acquiring the environmental thermal radiation of the target forest according to the environmental temperature acquired by the temperature acquisition unit;
a generation block for generating an environmental thermal image based on the environmental thermal radiation;
a synthesis block for eliminating the ambient thermal radiation contained on the terrestrial thermal image using the ambient thermal image, extracting a first detection grid on the terrestrial thermal image having a thermal radiation higher than a first preset thermal radiation;
the analysis unit is further used for acquiring a region, on the tree thermal image, of which the heat radiation is higher than a preset second heat radiation.
In this example, ambient heat radiation represents heat radiation of the target forest ambient temperature;
in this example, the environmental thermal image represents a thermal image corresponding to the target environmental temperature.
The beneficial effect of above-mentioned design is: when the environmental temperature of the forest is high, the temperature of the ground and trees can be increased, and suspicious high-temperature points of a plurality of non-ignition points exist on the thermal image, so that the thermal image of the ground and the thermal image of the trees can work after the environmental heat radiation is eliminated, and the work efficiency is improved for reducing unnecessary subsequent work.
Example 8
Based on embodiment 4, a thermal imaging device for forest fire prevention, the analysis module further includes:
the analysis unit is further used for acquiring the downwind direction of each ignition point based on the current wind direction, and acquiring first images of all objects downwind from the ignition points on the current image;
the image processing unit is further used for traversing the first image by using a preset trunk color and respectively extracting the position of the inflammable object in the downwind direction of each ignition point;
the control unit is used for controlling the image acquisition unit to acquire a next frame image of the current image;
the image processing unit is further configured to obtain brightness of a flame edge pixel corresponding to each ignition point on the next frame of image, and obtain a first flame with highest flame brightness corresponding to each ignition point;
the image processing unit is further configured to cover each of the ignition points with a first rectangular frame on the current image, and simultaneously cover each of the ignition points with a second rectangular frame on the same position of the next frame of image;
the image processing unit is further configured to, when an uncovered ignition point exists on the next frame of image, respectively cover each corresponding ignition point by using an oval frame, and define the ignition point as a newly added ignition point;
the image processing unit is further used for respectively placing the image contained in the first rectangular frame, the image contained in the second rectangular frame and the image contained in the oval frame in preset images to define the images as flame images;
filling an image contained in a first rectangular frame with a first preset color, and filling an image contained in a second rectangular frame and an image contained in an elliptical frame with a second preset color on the flame image;
the analysis unit is further configured to obtain a flame growth area corresponding to each ignition point on the flame image based on a first rectangular frame area and a second rectangular frame area at the same position on the current image and the next frame image, determine a flame spread speed corresponding to the ignition point, and calculate a time length for the first flame to spread to the inflammable object according to a distance between the first flame and the inflammable object;
meanwhile, acquiring the inflammable objects with the spread duration less than the preset duration, and defining the inflammable objects as dangerous objects;
the analysis unit is further used for respectively obtaining the flame height of each ignition point on the flame image, determining the flame intensity of the corresponding ignition point, and meanwhile determining that all objects around the ignition point with the strongest flame intensity belong to dangerous objects;
the analysis unit is further used for extracting a dangerous area with the highest distribution density of the oval frame and determining that all inflammable objects contained in the dangerous area belong to dangerous objects;
the analysis module is further used for acquiring the dangerous objects downwind of the newly-increased fire point;
the analysis module is further used for respectively placing the positions of the dangerous objects in a preset three-dimensional space, generating a suggested putting-out track based on the distribution density of the dangerous objects, and transmitting the suggested putting-out track to a designated terminal for displaying.
In this example, downwind represents the downwind mouth of the wind direction, e.g., the current wind direction is west-east, then downwind is east;
in this example, combustible objects represent trees in the target forest and combustible materials present on the forest floor;
in this example, the rectangular frame and the oval frame both represent hollow rectangles that can cover the corresponding fire points;
in this example, the flame image representation is composed of an image contained in a first rectangular frame on the current image and an image contained in a second rectangular frame and an oval frame on the subsequent frame image;
in this example, the first flame means a flame that is sufficiently burned in the corresponding ignition point;
in this example, the flame propagation speed represents the amount of propagation of flame per unit time;
in this example, the dangerous object represents an object that will be ignited within a preset time.
The beneficial effect of above-mentioned design is: because the wind direction can influence the track of spreading of flame, the event gathers the current wind direction of target forest and utilizes and predetermine the first image that trunk color traversed the downwind direction of ignition, draw the position of downwind direction dangerous object, wind direction is less to the track of spreading of flame when the intensity of a fire is great, the event acquires all dangerous object's around the ignition position under this condition position, simultaneously, when there is newly-increased ignition, in time acquire dangerous object around it, and appoint the suggestion track of putting out a fire according to dangerous object's distribution density, supply the personnel of putting out a fire to refer to.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A thermal imaging apparatus for forest fire prevention, comprising:
the acquisition module is used for acquiring a thermal image, a current image, an environmental temperature value and a current wind direction of a target forest;
the analysis module is used for acquiring suspicious high-temperature points in the target forest on the thermal image, acquiring the positions of the suspicious high-temperature points belonging to the fire point on the current image and generating an alarm instruction;
the analysis module is also used for analyzing the flame trend corresponding to the fire point based on the current wind direction of the target forest after the fire;
and the alarm module is used for starting an alarm based on the alarm instruction and transmitting the flame trend of the fire point to a specified terminal for displaying.
2. A forest fire protection thermal imaging apparatus according to claim 1, wherein the acquisition module comprises:
the image acquisition unit is used for acquiring a thermal image and a current image of the target forest;
the temperature acquisition unit is used for acquiring an environmental temperature value of a target forest;
and the wind direction acquisition unit is used for acquiring the current wind direction of the target forest.
3. A forest fire prevention thermal imaging apparatus as defined in claim 1 wherein:
the analysis module is further used for judging whether a shielding foreign matter exists in front of the image acquisition unit or not based on the definition of the current image.
4. A forest fire prevention thermal imaging apparatus as defined in claim 1 wherein:
the analysis module is further used for acquiring dangerous objects around the corresponding fire point based on the current wind direction of the target forest and the inflammable objects around the fire point.
5. A forest fire prevention thermal imaging apparatus as claimed in claim 3, wherein the analysis module further comprises:
an image processing unit for respectively obtaining the corresponding gray value of each pixel point of the current image,
the analysis unit is used for extracting pixel points with gray values higher than a preset gray value from the current image, and when the number of the extracted pixel points is larger than a preset number, the fact that shielding foreign matters exist in front of the image acquisition unit is determined;
the analysis unit is further used for generating a processing instruction, acquiring the position of the extracted pixel point on the current image, acquiring the position of the foreign matter shielding the image acquisition unit, and transmitting the position to the mobile terminal for displaying.
6. A forest fire prevention thermal imaging apparatus as claimed in claim 3, wherein the analysis module comprises:
the image processing unit is also used for extracting pixel points containing target forest ground on the thermal image and connecting to obtain a ground thermal image;
the image processing unit is also used for dividing the ground thermal image into detection grids with preset sizes and respectively acquiring thermal radiation corresponding to each detection grid;
the analysis unit is further used for extracting a first detection grid with heat radiation higher than first preset heat radiation at the current environmental temperature based on the environmental temperature of the target forest, and defining the first detection grid as a first suspicious high-temperature point based on the position on the ground thermal image;
the analysis unit is also used for acquiring the rest part of the thermal image except the ground thermal image, and the rest part of the thermal image is defined as a tree thermal image;
the analysis unit is further used for extracting an area with heat radiation higher than second preset heat radiation at the current ambient temperature on the tree thermal image based on the ambient temperature of the target forest, and the area is defined as a second suspicious high-temperature point;
the first suspicious high-temperature point and the second suspicious high-temperature point are collectively called as suspicious high-temperature points;
the image processing unit is further configured to obtain a position of the suspicious high temperature point on the current image;
the analysis unit is further configured to obtain a first pixel around each suspicious high-temperature point on the current image, obtain a first gray value corresponding to the first pixel and a remote gray value having a preset distance from the high-temperature point in a distributed manner, and determine whether there is a suspicious high-temperature point where a difference between each first gray value and the corresponding remote gray value is greater than a preset difference;
if yes, determining that the corresponding suspicious high-temperature point belongs to a class of ignition points;
the analysis unit is further configured to remove the class of fire points from the current image, convert the current image into an RGB domain, and obtain RGB values corresponding to each remaining suspicious high-temperature point;
the analysis unit is further used for drawing an RGB value histogram of the remaining suspicious high-temperature points and judging whether the remaining suspicious high-temperature points with R values larger than a preset value exist or not;
if yes, determining that the suspicious high-temperature point with the pixel brightness outside the preset range belongs to a second class fire point;
wherein the first class fire point and the second class fire point are collectively called as fire points;
and acquiring the position of a fire point, and generating an alarm instruction.
7. A forest fire prevention thermal imaging apparatus as claimed in claim 6, wherein the analysis unit comprises:
the acquisition block is used for acquiring the environmental thermal radiation of the target forest according to the environmental temperature acquired by the temperature acquisition unit;
a generation block for generating an environmental thermal image based on the environmental thermal radiation;
a synthesis block for eliminating the ambient thermal radiation contained on the terrestrial thermal image using the ambient thermal image, extracting a first detection grid on the terrestrial thermal image having a thermal radiation higher than a first preset thermal radiation;
the analysis unit is further used for acquiring a region, on the tree thermal image, of which the heat radiation is higher than a preset second heat radiation.
8. A forest fire prevention thermal imaging apparatus as claimed in claim 4, wherein the analysis module further comprises:
the analysis unit is further used for acquiring the downwind direction of each ignition point based on the current wind direction, and acquiring first images of all objects downwind from the ignition points on the current image;
the image processing unit is further used for traversing the first image by using a preset trunk color and respectively extracting the position of the inflammable object in the downwind direction of each ignition point;
the control unit is used for controlling the image acquisition unit to acquire a next frame image of the current image;
the image processing unit is further configured to obtain brightness of a flame edge pixel corresponding to each ignition point on the next frame of image, and obtain a first flame with highest flame brightness corresponding to each ignition point;
the image processing unit is further configured to cover each of the ignition points with a first rectangular frame on the current image, and simultaneously cover each of the ignition points with a second rectangular frame on the same position of the next frame of image;
the image processing unit is further configured to, when an uncovered ignition point exists on the next frame of image, respectively cover each corresponding ignition point by using an oval frame, and define the ignition point as a newly added ignition point;
the image processing unit is further used for respectively placing the image contained in the first rectangular frame, the image contained in the second rectangular frame and the image contained in the oval frame in preset images to define the images as flame images;
filling an image contained in a first rectangular frame with a first preset color, and filling an image contained in a second rectangular frame and an image contained in an elliptical frame with a second preset color on the flame image;
the analysis unit is further configured to obtain a flame growth area corresponding to each ignition point on the flame image based on a first rectangular frame area and a second rectangular frame area at the same position on the current image and the next frame image, determine a flame spread speed corresponding to the ignition point, and calculate a time length for the first flame to spread to the inflammable object according to a distance between the first flame and the inflammable object;
meanwhile, acquiring the inflammable objects with the spread duration less than the preset duration, and defining the inflammable objects as dangerous objects;
the analysis unit is further used for respectively obtaining the flame height of each ignition point on the flame image, determining the flame intensity of the corresponding ignition point, and meanwhile determining that all objects around the ignition point with the strongest flame intensity belong to dangerous objects;
the analysis unit is further used for extracting a dangerous area with the highest distribution density of the oval frame and determining that all inflammable objects contained in the dangerous area belong to dangerous objects;
the analysis module is further used for acquiring the dangerous objects downwind of the newly-increased fire point;
the analysis module is further used for respectively placing the positions of the dangerous objects in a preset three-dimensional space, generating a suggested putting-out track based on the distribution density of the dangerous objects, and transmitting the suggested putting-out track to a designated terminal for displaying.
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