Panoramic image fire detection system and method for nuclear power plant

Abstract

The invention relates to a nuclear power plant panoramic image fire detection system and method. The system comprises a panoramic image fire detector, an image processing module and a fire detection system host. The panoramic image type fire detector monitors a monitoring area, outputs panoramic image information, and outputs a fire detection signal when monitoring fire alarm information; the panoramic image type fire detector comprises a panoramic acquisition module; the panoramic acquisition module comprises a plurality of spliced lenses; the image processing module is used for processing the panoramic image information to obtain panoramic image data, identifying the fire detection signal and outputting a fire alarm signal or a misjudgment signal according to an identification result; and the fire detection system host outputs and displays the panoramic image data, the fire alarm signal or the misjudgment signal. According to the invention, the requirement of panoramic detection can be met by using one panoramic image type fire detector, the convenience and flexibility of design can be improved, the processing burden of monitoring personnel can be reduced, and the disaster discovery speed can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant fire monitoring, and more specifically, to a nuclear power plant panoramic image fire detection system and method. Background Art

[0002] The image-based fire detection system is a visual early fire detection and alarm system based on advanced technologies such as video image processing, artificial intelligence processing and analysis, Internet of Things communication, and big data platform. It can detect the spectral characteristics of smoke, flame, temperature, etc. produced by the combustion of materials. The system is mainly composed of image-based flame fire detectors, image-based linear beam smoke fire detectors, image-based temperature fire detectors, image-based smoke and fire composite detectors, smart cameras, AI smart video analysis servers, and system management software.

[0003] In order to meet the requirement that the detector can cover the whole scene, the existing image-based fire detection system of nuclear power plants uses a single fixed-focus lens. The field of view of the single fixed-focus lens is a conical tetrahedron structure, which has great limitations in the detection range and a considerable proportion of detection blind spots. Therefore, in order to compensate for each other in the field of view, detectors are usually installed in pairs in an image-based fire detection system, which increases the equipment cost and the workload of construction, commissioning, and operation and maintenance. Since the spatial dimensions and structures of the protected areas are different, designers need to adapt to local conditions and analyze and calculate the number of detectors, detector control boxes, hubs, hosts, and control cabinets for each independent space in turn. The design process is long and the workload is large. Human errors are very likely to occur during the design process, which reduces the design efficiency. In a detection area, in order to ensure the complete coverage area, the detectors are usually designed diagonally. If one of them fails, the detection area will be reduced by nearly 50%. The reliability of this diagonal design is too low. Due to the limitations of the detection angle, image detectors are usually used for local detection and are difficult to be used for full-space protection in a specific area. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a nuclear power plant panoramic image fire detection system and method in view of the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: construct a panoramic image fire detection system for a nuclear power plant, including: a panoramic image fire detector, an image processing module and a fire detection system host;

[0006] The panoramic image type fire detector is used to monitor the monitoring area and output the panoramic image information of the monitoring area, and output a fire detection signal when the fire alarm information is detected; the panoramic image type fire detector comprises: a panoramic acquisition module; the panoramic acquisition module comprises a plurality of spliced ​​lenses;

[0007] The image processing module is connected to the panoramic image type fire detector, and is used to process the panoramic image information to obtain panoramic image data, and to identify the fire detection signal, and output a fire alarm signal or a false positive signal according to the identification result;

[0008] The fire detection system host is connected to the image processing module and is used to output and display the panoramic image data, the fire alarm signal or the misjudgment signal.

[0009] In the panoramic image fire detection system for a nuclear power plant of the present invention, the panoramic acquisition module comprises: a first lens, a second lens and a third lens;

[0010] The horizontal and vertical viewing angles of the first lens, the second lens and the third lens are all the same, and the first lens, the second lens and the third lens are radially adjacently arranged around the same center of a circle.

[0011] In the nuclear power plant panoramic image fire detection system described in the present invention, the horizontal field of view angle and the vertical field of view angle of the first lens, the second lens and the third lens are all 64°, and the detection angle after the first lens, the second lens and the third lens are spliced ​​is 180°.

[0012] In the panoramic image fire detection system for a nuclear power plant of the present invention, the panoramic image fire detector further comprises: an imaging component and an image stitching module;

[0013] The imaging component is connected to the panoramic acquisition module and is used to perform imaging processing on multiple acquisition signals of the panoramic acquisition module to obtain multiple acquisition images;

[0014] The image stitching module is connected to the imaging component and is used to stitch the multiple collected images to obtain the panoramic image information.

[0015] In the nuclear power plant panoramic image fire detection system of the present invention, the image stitching module includes: an initial image processing unit, a feature extraction unit, a model building unit and an image stitching unit;

[0016] The initial image processing unit is used to perform image registration on the multiple acquired images to determine the spatial relationship and overlapping area between the multiple acquired images;

[0017] The feature extraction unit is used to extract features of the multiple acquired images to obtain a correspondence relationship between feature points of the multiple acquired images, and determine a transformation relationship between different images based on the correspondence relationship between the feature points of the multiple acquired images;

[0018] The model building unit is used to build a mathematical transformation model of two adjacent images based on the spatial relationship and overlapping area between the multiple acquired images and the transformation relationship between different images;

[0019] The image stitching unit is used to perform transformation according to the mathematical transformation model of the two adjacent images to obtain the panoramic image information.

[0020] In the panoramic image fire detection system for a nuclear power plant of the present invention, the panoramic image fire detector further comprises: an infrared detector;

[0021] The infrared detector is used to monitor the temperature of the monitoring area and output a temperature detection signal.

[0022] In the panoramic image fire detection system for nuclear power plants of the present invention, the panoramic image fire detector further comprises: a wired / wireless communication module;

[0023] The wired / wireless communication module is used to send the panoramic image data and / or the fire detection signal to the image processing module.

[0024] The present invention also provides a nuclear power plant panoramic image fire detection method, which is applied to the above-mentioned nuclear power plant panoramic image fire detection system, and comprises the following steps:

[0025] Monitor the monitoring area and output panoramic image information of the monitoring area, and output a fire detection signal when fire alarm information is detected;

[0026] Processing the panoramic image information to obtain panoramic image data; or identifying the fire detection signal and outputting a fire alarm signal or a false positive signal according to the identification result;

[0027] The panoramic image data, the fire alarm signal or the misjudgment signal is output and displayed.

[0028] In the nuclear power plant panoramic image fire detection method of the present invention, the monitoring of the monitoring area and outputting the panoramic image information of the monitoring area includes:

[0029] Capturing images of the monitoring area through multiple panoramic acquisition modules to obtain multiple acquisition signals;

[0030] Performing imaging processing on the multiple acquisition signals through an imaging component to obtain multiple acquisition images;

[0031] The multiple acquired images are stitched together to obtain the panoramic image information.

[0032] In the nuclear power plant panoramic image fire detection method of the present invention, the stitching of the multiple acquired images to obtain the panoramic image information includes:

[0033] By performing image registration on the multiple acquired images, a spatial relationship and an overlapping area between the multiple acquired images are determined;

[0034] Extracting features of the plurality of acquired images to obtain a correspondence relationship between feature points of the plurality of acquired images, and determining a transformation relationship between different images based on the correspondence relationship between the feature points of the plurality of acquired images;

[0035] Establishing a mathematical transformation model of two adjacent images based on the spatial relationship and overlapping area between the multiple acquired images and the transformation relationship between different images;

[0036] Transformation is performed according to the mathematical transformation model of the two adjacent images to obtain the panoramic image information.

[0037] The implementation of the nuclear power plant panoramic image fire detection system and method of the present invention has the following beneficial effects: including: a panoramic image fire detector, an image processing module and a fire detection system host; the panoramic image fire detector monitors the monitoring area and outputs panoramic image information, and outputs a fire detection signal when a fire alarm information is detected; the panoramic image fire detector includes a panoramic acquisition module; the panoramic acquisition module includes a plurality of spliced ​​lenses; the image processing module processes the panoramic image information to obtain panoramic image data and identifies the fire detection signal and outputs a fire alarm signal or a false positive signal according to the identification result; the fire detection system host outputs and displays the panoramic image data, the fire alarm signal or the false positive signal. The present invention uses a panoramic image fire detector to meet the needs of panoramic detection, which can not only increase the convenience and flexibility of the design, but also reduce the processing burden of the monitoring personnel and improve the speed of disaster discovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0039] Figure 1 It is a principle block diagram of the nuclear power plant panoramic image fire detection system provided by the present invention;

[0040] Figure 2 It is a schematic diagram of the stitching of the panoramic image stitching lens of the panoramic image type fire detector provided by the present invention;

[0041] Figure 3 It is a schematic diagram of the application of the panoramic image fire detection system for nuclear power plants provided by the present invention;

[0042] Figure 4It is a flow chart of the nuclear power plant panoramic image fire detection method provided by the present invention. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0044] In order to solve the problems of existing image-based fire detection systems, such as large workload when designing panoramic coverage, excessive information that multiple detectors need to process, insufficient coverage area of ​​a single fire detector, single detection method, and insufficient reliability of single-link transmission, the present invention provides a nuclear power plant panoramic image fire detection system, which can effectively solve the above problems.

[0045] Specifically, Figure 1 As shown, in a preferred embodiment, the panoramic image fire detection system of a nuclear power plant includes: a panoramic image fire detector 100, an image processing module 200 and a fire detection system host 300.

[0046] The panoramic image type fire detector 100 is used to monitor a monitoring area and output panoramic image information of the monitoring area, and output a fire detection signal when fire alarm information is detected.

[0047] Optionally, in an embodiment of the present invention, if Figure 1 As shown, the panoramic image type fire detector 100 includes: a panoramic acquisition module 11; the panoramic acquisition module 11 includes a plurality of stitching lenses.

[0048] In a preferred embodiment, Figure 2 As shown, the panoramic acquisition module 11 includes: a first lens (lens 1), a second lens (lens 2) and a third lens (lens 3); the horizontal field of view angle and the vertical field of view angle of the first lens, the second lens and the third lens are the same, and the first lens, the second lens and the third lens are arranged radially adjacent to each other around the same center of a circle. Among them, the horizontal field of view angle and the vertical field of view angle of the first lens, the second lens and the third lens are both 64°, and the detection angle after the first lens, the second lens and the third lens are spliced ​​is 180°.

[0049] Specifically, since image-type fire detectors are all installed against the wall and the installation height must be above the moving objects and equipment on site to overlook the monitored area, in an embodiment of the present invention, the horizontal field of view angle and the vertical field of view angle of the first lens, the second lens and the third lens are all set to 64°, and are placed radially adjacent to each other around the same center of a circle, so that the detection angle of the panoramic image-type fire detector 100 can reach 180° panoramic detection.

[0050] Further, in the embodiment of the present invention, if Figure 1 As shown, the panoramic image type fire detector 100 further includes: an imaging component 12 and an image stitching module 13. The imaging component 12 is connected to the panoramic acquisition module 11, and is used to perform imaging processing on multiple acquisition signals of the panoramic acquisition module 11 to obtain multiple acquisition images; the image stitching module 13 is connected to the imaging component 12, and is used to stitch multiple acquisition images to obtain panoramic image information.

[0051] Further, in the embodiment of the present invention, if Figure 1 As shown, the image stitching module 13 includes: an initial image processing unit 131 , a feature extraction unit 132 , a model building unit 133 and an image stitching unit 134 .

[0052] Among them, the initial image processing unit 131 is used to perform image registration on multiple acquired images to determine the spatial relationship and overlapping area between the multiple acquired images; the feature extraction unit 132 is used to extract features of the multiple acquired images to obtain the correspondence between feature points between the multiple acquired images, and determine the transformation relationship between different images based on the correspondence between feature points between the multiple acquired images; the model establishment unit 133 is used to establish a mathematical transformation model of two adjacent images based on the spatial relationship and overlapping area between the multiple acquired images and the transformation relationship between different images; the image stitching unit 134 is used to perform transformation according to the mathematical transformation model of two adjacent images to obtain panoramic image information.

[0053] Further, in the embodiment of the present invention, if Figure 1 As shown, the panoramic image type fire detector 100 further includes: an infrared detector 14; wherein the infrared detector 14 is used to monitor the temperature of the monitoring area and output a temperature sensing detection signal.

[0054] Further, in the embodiment of the present invention, if Figure 1As shown, the panoramic image fire detector 100 also includes: a wired / wireless communication module 15; wherein the wired / wireless communication module 15 is used to send the panoramic image data and / or the fire detection signal to the image processing module 200. That is, the panoramic image fire detector 100 includes: a wired communication module and a wireless communication module, through which the wired transmission of signals / data can be realized, and through which the wireless communication module can be realized, the wireless transmission of signals / data can be realized, which effectively solves the problem of insufficient reliability of single-link transmission. Specifically, as Figure 3 As shown in the figure, in order to facilitate deployment and increase the reliability of signal transmission, the detector adds a wireless communication module. When the detector detects a disaster and sends an alarm signal to the host, the alarm signal can be transmitted simultaneously through wired and wireless. Such a dual-path link improves the reliability of fire alarm signal transmission.

[0055] Specifically, in the embodiment of the present invention, since the field of view of the three lenses partially overlaps, in order to reduce the number of fire images at the remote monitoring end, reduce the processing burden of the monitoring personnel, and improve the speed of disaster discovery, the present invention performs panoramic plane stitching on the video images with overlapping areas of the three partial areas. The specific stitching process is as follows:

[0056] First, the initial image processing unit 131 performs image registration on multiple collected images to determine the spatial relationship and overlapping area between different images. Then, the feature extraction unit 132 uses the SIFT (Scale-invariant feature transform) feature extraction algorithm to extract image features, find feature points (such as boundary points, inflection points) in different images, and determine the correspondence between feature points between images, and then use this correspondence to find the transformation relationship between the two images. Then, the RANSAC algorithm is used to purify the SIFT feature points and eliminate abnormal matching feature points to obtain a high-quality matching point set. Then, the model building unit 133 uses a point-to-point direct comparison algorithm combined with a coverage reduction algorithm to estimate the parameter values ​​of the image registration according to the correspondence between the features, thereby establishing a mathematical transformation model of the two images. Finally, the image splicing unit 134 completes the splicing of the transformation matrix obtained by DLT (direct linear transformation) on the image.

[0057] Each module in the panoramic image fire detector 100 is arranged in a corresponding outer protective cover. The panoramic image fire detector 100 has the characteristic of being able to take panoramic photos, that is, the image output by the panoramic image fire detector 100 is a spliced ​​panoramic image. Since it has the characteristic of being able to take panoramic photos, almost all rooms whose detection area is smaller than the detection area of ​​the image fire detector can be covered by only one set of image fire detection system.

[0058] In the embodiment of the present invention, in order to allow the panoramic image fire detector 100 to have multiple detection functions of smoke, temperature and flame detection at the same time, the panoramic image fire detector 100 is also equipped with an infrared detector 14, which can realize temperature monitoring of the monitoring area. Specifically, when the panoramic image fire detector is working, the panoramic acquisition module 11 and the infrared detector 14 work at the same time, the camera collects images of the monitoring area, and obtains panoramic image information of the monitoring area through image processing, and then the subsequent image processing module 200 performs image analysis and processing to extract fire-related feature information such as flames and smoke. If the parameters such as grayscale changes, flickering frequency, color and motion mode of a certain area in the image meet the characteristics of fire or smoke, a fire alarm can be determined. The infrared sensor is also used to detect the monitoring area, and the infrared sensing technology is used to detect abnormal temperature and detect fire in time. When the camera or infrared sensor recognizes the fire characteristic signal, an alarm signal is issued; when the camera and the infrared sensor recognize the fire characteristic signal at the same time, it can be used as a confirmed fire signal.

[0059] The image processing module 200 is connected to the panoramic image type fire detector 100, and is used to process the panoramic image information to obtain panoramic image data, and to identify the fire detection signal, and output a fire alarm signal or a false positive signal according to the identification result.

[0060] Specifically, after the images are stitched, the APAP algorithm is used through the image processing module 200 to divide the images into a large number of regular small grids, namely, local homography transformation matrices, and then these local homography transformation matrices are calculated separately to reduce the overall homography transformation error, so as to correct the discontinuity or overlap in the panoramic image, and finally eliminate the color distortion caused by lighting changes or camera setting differences between different images to ensure color consistency.

[0061] The fire detection system host 300 is connected to the image processing module 200 and is used to output and display panoramic image data, fire alarm signals or misjudgment signals.

[0062] refer to Figure 4 , Figure 4 A nuclear power plant panoramic image fire detection method is provided. The nuclear power plant panoramic image fire detection method can be applied to a nuclear power plant panoramic image fire detection system disclosed in an embodiment of the present invention.

[0063] Specifically, Figure 4 As shown, the nuclear power plant panoramic image fire detection method includes the following steps:

[0064] Step S401: monitor the monitoring area and output panoramic image information of the monitoring area, and output a fire detection signal when fire alarm information is detected.

[0065] In an embodiment of the present invention, a panoramic image type fire detector 100 includes: a panoramic acquisition module 11; the panoramic acquisition module 11 includes a plurality of spliced ​​lenses. In a preferred embodiment, the panoramic acquisition module 11 includes: a first lens (lens 1), a second lens (lens 2) and a third lens (lens 3); the horizontal field of view angle and the vertical field of view angle of the first lens, the second lens and the third lens are the same, and the first lens, the second lens and the third lens are arranged radially adjacent to each other around the same center of a circle. The horizontal field of view angle and the vertical field of view angle of the first lens, the second lens and the third lens are both 64°, and the detection angle after the first lens, the second lens and the third lens are spliced ​​is 180°.

[0066] Specifically, since image-type fire detectors are all installed against the wall and the installation height must be above the moving objects and equipment on site to overlook the monitored area, in an embodiment of the present invention, the horizontal field of view angle and the vertical field of view angle of the first lens, the second lens and the third lens are all set to 64°, and are placed radially adjacent to each other around the same center of a circle, so that the detection angle of the panoramic image-type fire detector 100 can reach 180° panoramic detection.

[0067] In an embodiment of the present invention, monitoring a monitoring area and outputting panoramic image information of the monitoring area includes: performing image acquisition on the monitoring area through multiple panoramic acquisition modules 11 to obtain multiple acquisition signals; performing imaging processing on the multiple acquisition signals through an imaging component 12 to obtain multiple acquisition images; and stitching the multiple acquisition images to obtain panoramic image information.

[0068] Step S402: Process the panoramic image information to obtain panoramic image data; or, identify the fire detection signal and output a fire alarm signal or a false positive signal according to the identification result.

[0069] In the embodiment of the present invention, the image stitching module 13 includes: an initial image processing unit 131, a feature extraction unit 132, a model building unit 133 and an image stitching unit 134. The initial image processing unit 131 is used to perform image registration on multiple acquired images to determine the spatial relationship and overlapping area between the multiple acquired images; the feature extraction unit 132 is used to extract features of the multiple acquired images to obtain the correspondence between feature points between the multiple acquired images, and determine the transformation relationship between different images based on the correspondence between feature points between the multiple acquired images; the model building unit 133 is used to establish a mathematical transformation model of two adjacent images based on the spatial relationship and overlapping area between the multiple acquired images and the transformation relationship between different images; the image stitching unit 134 is used to perform transformation according to the mathematical transformation model of the two adjacent images to obtain panoramic image information.

[0070] Specifically, stitching multiple acquired images to obtain panoramic image information includes: performing image registration on the multiple acquired images to determine the spatial relationship and overlapping areas between the multiple acquired images; extracting features of the multiple acquired images to obtain the correspondence between feature points between the multiple acquired images, and determining the transformation relationship between different images based on the correspondence between the feature points between the multiple acquired images; establishing a mathematical transformation model of two adjacent images based on the spatial relationship and overlapping areas between the multiple acquired images and the transformation relationship between different images; and performing transformation according to the mathematical transformation model of the two adjacent images to obtain panoramic image information.

[0071] Step S403: output and display the panoramic image data, fire alarm signal or misjudgment signal.

[0072] The present invention can meet the needs of panoramic detection by using one detector, and does not require accurate calculation of the detector's coverage area and the number of corresponding detector control boxes, hubs, hosts and control cabinets, which increases the convenience and flexibility of the design. The images from multiple angles transmitted by the detector camera are combined and spliced ​​into a panoramic picture, which increases the convenience of fire monitoring, reduces the processing burden of monitoring personnel, and improves the speed of disaster discovery.

[0073] In addition, the present invention also improves economic efficiency. The workload of detectors and terminations is less, and the workload of installation, debugging, and operation and maintenance is reduced accordingly, which improves the economic efficiency of the project. Among them, the installation position and height of the detector are more flexible. It can be installed on the wall or under the ceiling according to the needs of the site, and can achieve detection protection for the entire space. The panoramic image type fire detector 100 of the present invention also has three detection modes: smoke, temperature, and flame, and has early warning and fire alarm functions. At the same time, the use of wired / wireless dual-channel transmission increases the reliability of detector signal transmission.

[0074] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0075] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0076] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0077] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power plant panoramic image fire detection system, characterized in that: include: Panoramic image fire detectors, image processing modules and fire detection system host; The panoramic image type fire detector is used to monitor the monitoring area and output the panoramic image information of the monitoring area, and output a fire detection signal when a fire alarm information is detected; The panoramic image type fire detector comprises: a panoramic acquisition module; the panoramic acquisition module comprises a plurality of spliced ​​lenses; The image processing module is connected to the panoramic image type fire detector, and is used to process the panoramic image information to obtain panoramic image data, and to identify the fire detection signal, and output a fire alarm signal or a false positive signal according to the identification result; The fire detection system host is connected to the image processing module and is used to output and display the panoramic image data, the fire alarm signal or the misjudgment signal.

2. The nuclear power plant panoramic image fire detection system according to claim 1, characterized in that: The panoramic acquisition module includes: a first lens, a second lens and a third lens; The horizontal and vertical viewing angles of the first lens, the second lens and the third lens are all the same, and the first lens, the second lens and the third lens are radially adjacently arranged around the same center of a circle.

3. The nuclear power plant panoramic image fire detection system according to claim 2, characterized in that: The horizontal and vertical field angles of the first lens, the second lens, and the third lens are all 64°, and the detection angle of the first lens, the second lens, and the third lens after being spliced ​​is 180°.

4. The nuclear power plant panoramic image fire detection system according to claim 1, characterized in that: The panoramic image type fire detector also includes: an imaging component and an image stitching module; The imaging component is connected to the panoramic acquisition module and is used to perform imaging processing on multiple acquisition signals of the panoramic acquisition module to obtain multiple acquisition images; The image stitching module is connected to the imaging component and is used to stitch the multiple collected images to obtain the panoramic image information.

5. The nuclear power plant panoramic image fire detection system according to claim 4, characterized in that: The image stitching module includes: an initial image processing unit, a feature extraction unit, a model building unit and an image stitching unit; The initial image processing unit is used to perform image registration on the multiple acquired images to determine the spatial relationship and overlapping area between the multiple acquired images; The feature extraction unit is used to extract features of the multiple acquired images to obtain a correspondence relationship between feature points of the multiple acquired images, and determine a transformation relationship between different images based on the correspondence relationship between the feature points of the multiple acquired images; The model building unit is used to build a mathematical transformation model of two adjacent images based on the spatial relationship and overlapping area between the multiple acquired images and the transformation relationship between different images; The image stitching unit is used to perform transformation according to the mathematical transformation model of the two adjacent images to obtain the panoramic image information.

6. The nuclear power plant panoramic image fire detection system according to claim 1, characterized in that: The panoramic image type fire detector also includes: an infrared detector; The infrared detector is used to monitor the temperature of the monitoring area and output a temperature detection signal.

7. The nuclear power plant panoramic image fire detection system according to claim 1, characterized in that: The panoramic image type fire detector further comprises: a wired / wireless communication module; The wired / wireless communication module is used to send the panoramic image data and / or the fire detection signal to the image processing module.

8. A nuclear power plant panoramic image fire detection method, applied to the nuclear power plant panoramic image fire detection system according to any one of claims 1 to 7, characterized in that: The following steps are involved: Monitor the monitoring area and output panoramic image information of the monitoring area, and output a fire detection signal when fire alarm information is detected; Processing the panoramic image information to obtain panoramic image data; or identifying the fire detection signal and outputting a fire alarm signal or a false positive signal according to the identification result; The panoramic image data, the fire alarm signal or the misjudgment signal is output and displayed.

9. The nuclear power plant panoramic image fire detection method according to claim 8, characterized in that: The monitoring of the monitoring area and outputting the panoramic image information of the monitoring area comprises: Capturing images of the monitoring area through multiple panoramic acquisition modules to obtain multiple acquisition signals; Performing imaging processing on the multiple acquisition signals through an imaging component to obtain multiple acquisition images; The multiple acquired images are stitched together to obtain the panoramic image information.

10. The nuclear power plant panoramic image fire detection method according to claim 9, characterized in that: The stitching of the multiple acquired images to obtain the panoramic image information includes: By performing image registration on the multiple acquired images, a spatial relationship and an overlapping area between the multiple acquired images are determined; Extracting features of the plurality of acquired images to obtain a correspondence relationship between feature points of the plurality of acquired images, and determining a transformation relationship between different images based on the correspondence relationship between the feature points of the plurality of acquired images; Establishing a mathematical transformation model of two adjacent images based on the spatial relationship and overlapping area between the multiple acquired images and the transformation relationship between different images; Transformation is performed according to the mathematical transformation model of the two adjacent images to obtain the panoramic image information.

Images