A device for active detection of a short-wave infrared scope

Abstract

The application provides a device for actively detecting a short-wave infrared sighting telescope, and relates to the field of photoelectric detection. The device comprises a short-wave infrared observation module, a detection and calculation module, a main control module and a display module. The short-wave infrared observation module is used for collecting images of an environment area. The detection and calculation module comprises a target calculation unit and a laser detector. The laser detector is used for emitting detection laser, capturing the detection laser returned by a target object in the environment area, capturing the position information of the returned detection laser, and enhancing the returned detection laser through signal processing. The target calculation unit is used for determining the display screen coordinates corresponding to the target object based on a first image and a second image collected by the short-wave infrared observation module through an image difference method and a threshold analysis method, and sending the display screen coordinates to the main control module. The main control module is used for framing the display screen coordinates and controlling the display module to display the environment area, the target object and the frame.

Description

Technical Field

[0001] This application relates to the field of photoelectric detection, and in particular to a device for actively detecting short-wave infrared sights. Background Technology

[0002] Currently, global research on counter-sniper technology and the development of related products mainly focus on three key technology areas: acoustic detection, infrared detection, and laser detection. While acoustic and infrared detection technologies can accurately locate a sniper's position, they are passive detection methods, typically only revealing the sniper's location after they fire. Compared to passive detection technologies, active detection systems using lasers can detect potential snipers in advance, enabling preemptive detection and engagement, which is tactically more advantageous.

[0003] Active laser detection technology is based on the "cat's eye effect," which refers to the phenomenon where, when a laser beam strikes a sniper scope, the light is focused by a lens onto a reflective surface (such as a photosensitive surface or reticle), and then reflects back along its original path, forming a highly directional and concentrated echo. The intensity of the reflected light (echo) is 2-4 orders of magnitude higher than ordinary diffuse reflection, similar to the bright reflection of a cat's eye in the dark. By detecting the reflected light, which is much stronger than the surrounding environment, the sniper's position can be located. Because the power density of the echo signal does not rapidly attenuate with long-distance propagation, active detection can detect much greater distances compared to passive detection methods. Furthermore, active laser detection systems offer higher positioning accuracy and faster detection speeds. Therefore, active laser detection technology has received widespread attention in anti-sniper research and has significant development potential.

[0004] Currently, counter-sniper electro-optical detection lasers mainly focus on the near-infrared band, such as 808nm and 910nm. To evade detection by these systems, snipers have begun using short-wave infrared scopes or coating their scopes with near-infrared cutoff films. These films block near-infrared light in the 750nm to 1200nm band, reducing the average transmittance of near-infrared light to no more than 3%. As a result, existing counter-sniper electro-optical detection systems find it difficult or impossible to detect these scopes, thus reducing their effectiveness.

[0005] Therefore, how to detect and locate short-wave infrared sights or sights with near-infrared cutoff films coated on their glass windows has become an urgent problem to be solved. Summary of the Invention

[0006] In view of this, embodiments of this application provide a device for actively detecting short-wave infrared sights, comprising:

[0007] The system includes a shortwave infrared observation module, a detection and calculation module, a main control module, and a display module.

[0008] The short-wave infrared observation module is used to acquire images of the environmental area.

[0009] The detection and calculation module includes a target calculation unit and a laser detector. The laser detector is used to emit a detection laser, capture the detection laser returned by the target object within the environmental area, and capture the position information of the returned detection laser. It also enhances the returned detection laser through signal processing. The target calculation unit is used to determine the display screen coordinates corresponding to the target object based on the first image and the second image acquired by the short-wave infrared observation module using image difference and threshold analysis methods. The unit then sends the display screen coordinates to the main control module. The first image is the image acquired by the short-wave infrared observation module when the laser detector emits the detection laser, and the second image is the image acquired by the short-wave infrared observation module when the laser detector does not emit the detection laser.

[0010] The main control module is used to define the coordinates of the display screen and control the display module to display the environmental area, the target object, and the defined coordinates.

[0011] The device for actively detecting short-wave infrared sights according to the embodiments of this application may also have the following additional technical features:

[0012] Optionally, in the above technical solution, the target solving unit performs image differencing in the following ways:

[0013] Gaussian filtering is applied to the input image to remove noise, the input image including the first image and the second image;

[0014] The gradient magnitude of the input image is calculated using the Roberts operator;

[0015] The input image is divided into multiple sub-blocks. For each sub-block, the mean gray value and standard deviation of the sub-block are calculated, and an adaptive threshold within the sub-block is calculated based on the mean gray value and the standard deviation.

[0016] The first cat's eye region is obtained by segmenting the input image using the gradient magnitude and the adaptive threshold.

[0017] The first cat-eye region is subjected to morphological post-processing to obtain the second cat-eye region.

[0018] The contour of the second cat's eye region is extracted, and the ellipse equation is fitted using the least squares method. The target cat's eye region is then selected based on the conditions of eccentricity and area.

[0019] Optionally, in any of the above technical solutions, the threshold analysis method performed by the target solution unit includes:

[0020] The signal value corresponding to the target cat's eye area is compared with a preset threshold, and pixels with signal values ​​greater than the preset threshold are filtered out, thereby determining the display screen coordinates of the target object.

[0021] Optionally, in any of the above technical solutions, the shortwave infrared observation module includes a shortwave infrared core and a shortwave infrared objective lens, wherein the frame rate of the shortwave infrared objective lens is matched with the emission frequency of the laser detector and is clock-synchronized by the main control module.

[0022] Optionally, any of the above technical solutions may also include:

[0023] A housing assembly, comprising a front panel, a middle housing, and a rear panel, wherein a sealed cavity is formed within the housing assembly;

[0024] The detection and calculation module is located inside the sealed cavity; the front panel is provided with a laser emitting window and a laser receiving window, the laser emitting window is used to emit detection laser, and the laser receiving window is used to receive the returned detection laser.

[0025] In any of the above technical solutions, optionally, the front panel, the intermediate housing, and the rear panel are sealed together by screws and conductive sealing rings;

[0026] The laser detector uses a wavelength range of 1530nm to 1560nm.

[0027] The front end of the laser receiving window is provided with a 1550nm narrowband filter, the half width at half maximum (WWHM) of the narrowband filter is 10±2nm, and the transmittance is greater than 30%.

[0028] Optionally, any of the above technical solutions may also include:

[0029] A heat dissipation structure is provided for dissipating heat from the detection and calculation module.

[0030] Optionally, in any of the above technical solutions, the heat dissipation structure is provided with a thermally conductive silicone pad for conducting the heat from the detection and calculation module to the housing assembly of the active detection shortwave infrared sight.

[0031] Optionally, any of the above technical solutions may also include:

[0032] The positioning module is used to determine the actual coordinate information of the target object;

[0033] The positioning module includes a BeiDou positioning module, an electronic compass, and a laser rangefinder. The BeiDou positioning module is used to locate the latitude and longitude coordinates of its own observation point. The electronic compass is used to display the orientation information of the target object relative to its own observation point in real time. The laser rangefinder is used to measure the distance of the target object relative to its own observation point.

[0034] Optionally, in any of the above technical solutions, the main control module is further configured to receive user operation instructions, control the shortwave infrared observation module, the detection and calculation module, the main control module, the display module, and the positioning module according to the user operation instructions to complete the corresponding operation functions, and receive data and status information from the shortwave infrared observation module, the detection and calculation module, the main control module, the display module, and the positioning module to monitor the module operation status.

[0035] The active short-wave infrared (SWI) sight device of this application embodiment possesses functions such as long-distance observation, detection, and positioning. The short-wave infrared observation module used improves image quality in bright daylight and enables fog-penetrating observation. Short-wave infrared is less affected by environmental factors, and at night, atmospheric glow and night sky light can detect most materials, expanding the device's application range. This active short-wave infrared sight device can not only effectively detect and automatically mark the spatial location and distance of enemy SWIFT sights, but also correctly identify targets and effectively eliminate interfering targets within the field of view. It ensures imaging detection accuracy while also possessing anti-interference capabilities for non-imaging detection. Through active and passive image differential analysis, it can identify subtle target characteristics, thereby identifying and eliminating non-observation sight targets. In complex backgrounds, it can detect potential threat sources at long distances, over a wide area, and with high probability, quickly discovering and accurately locating them, ensuring rapid detection when targets are present and minimizing or eliminating false alarms when no targets are present.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0038] Figure 1 This paper shows a schematic diagram of the structure of an active detection shortwave infrared sight according to an embodiment of this application;

[0039] Figure 2 A second schematic diagram of the structure of an active detection shortwave infrared sight according to an embodiment of this application is shown;

[0040] Figure 3 A schematic diagram of the main interface of the active detection shortwave infrared sight according to an embodiment of this application is shown;

[0041] Figure 4 This paper shows a comparison of image differential data when detecting a shortwave infrared sight at 200m using an embodiment of this application.

[0042] Figure 5 This paper presents a comparison diagram of image differential data when detecting a shortwave infrared sight at 500m using an embodiment of this application.

[0043] Figure 6 This invention illustrates one of the working principle diagrams of an active detection shortwave infrared sight according to an embodiment of this application;

[0044] Figure 7 The second diagram illustrates the working principle of an active detection shortwave infrared sight according to an embodiment of this application.

[0045] The correspondence between component names and reference numerals is as follows:

[0046] 1. Shortwave infrared observation module; 2. Detection and calculation module; 3. Main control module; 4. Display module; 41. OLED display screen; 42. Eyepiece group; 43. Anti-light leakage eye cover; 5. Front panel; 6. Middle shell; 7. Rear panel; 8. Beidou positioning module; 9. Electronic compass; 10. Laser rangefinder; 11. Power module; 101. "Photo / Video" button icon; 102. "Menu" function button icon; 103. "Range" button icon; 104. "Detection" button icon; 105. Markings on the shortwave infrared sight. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0048] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0049] The active detection shortwave infrared sight provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0050] This application provides a device for an active detection short-wave infrared sight that automatically detects and labels targets, such as... Figure 1 and Figure 2 As shown, the device for the active detection shortwave infrared sight includes:

[0051] The system consists of a shortwave infrared observation module 1, a detection and calculation module 2, a main control module 3, and a display module 4.

[0052] Among them, the shortwave infrared observation module 1 is used to acquire images of the environmental area;

[0053] The detection and calculation module 2 includes a target calculation unit and a laser detector. The laser detector is used to emit a detection laser, capture the detection laser returned by the target object in the environment area, and capture the position information of the returned detection laser. It also enhances the returned detection laser through signal processing. The target calculation unit is used to determine the display screen coordinates corresponding to the target object based on the first image and the second image acquired by the short-wave infrared observation module through image difference and threshold analysis. The display screen coordinates are then sent to the main control module 3. The first image is the image acquired by the short-wave infrared observation module 1 when the laser detector emits the detection laser, and the second image is the image acquired by the short-wave infrared observation module 1 when the laser detector does not emit the detection laser.

[0054] The main control module 3 is used to mark the coordinates of the display screen and control the display module 4 to display the environment area, target object and mark.

[0055] In this embodiment, the shortwave infrared observation module 1 constitutes a passive observation system, the detection and calculation module 2 constitutes an active detection channel, and the target object for detection and labeling is a shortwave infrared aiming scope.

[0056] In one embodiment, the shortwave infrared observation module 1 includes a shortwave infrared core and a shortwave infrared objective lens, which can observe targets through glass during the day and also observe through fog in severe weather conditions such as heavy fog.

[0057] The laser detector in detection and calculation module 2 is pulsed, with its emission frequency matching the frame rate of the short-wave infrared objective lens and synchronized via external triggering. Continuous-wave lasers can also be used. The laser detector operates in the 1530nm to 1560nm wavelength band; preferably, it emits a 1550nm laser to detect targets. When the laser comes into contact with the short-wave infrared sight, due to the sight's reflective characteristics, the reflected laser energy is significantly higher than the reflected energy from the surrounding environment. The laser detector captures these reflected laser signals and their position information, and then enhances these signals through signal processing.

[0058] The target resolution unit generates the timing pulses required by the CCD camera and processes the reflected detection laser signal. The unit determines the position of the short-wave infrared sight, i.e., its display screen coordinates, using image differencing and threshold analysis. Specifically, it first captures two sets of signals: one when the laser detector emits the detection laser and the other when it does not—the first image and the second image. Image differencing yields a clean laser echo signal, eliminating background noise interference. Then, the obtained signal is compared with a preset threshold to select pixels with stronger signals, thereby determining the display screen coordinates of the short-wave infrared sight.

[0059] In one embodiment of this application, the target solving unit performs image differencing in the following manner:

[0060] Gaussian filtering is applied to the input image for noise reduction. The input image includes a first image and a second image.

[0061] The gradient magnitude of the input image is calculated using the Roberts operator;

[0062] The input image is divided into multiple sub-blocks. For each sub-block, the mean and standard deviation of the gray level of the sub-block are calculated, as well as the adaptive threshold within the sub-block is calculated based on the mean and standard deviation of the gray level.

[0063] The first cat's eye region is obtained by segmenting the input image using gradient magnitude and adaptive threshold.

[0064] The first cat's eye region was subjected to morphological post-processing to obtain the second cat's eye region;

[0065] The contour of the second cat's eye region is extracted, and the ellipse equation is fitted using the least squares method. The target cat's eye region is then selected based on the conditions of eccentricity and area.

[0066] In this embodiment of the application, the cat eye target extraction method based on image difference specifically includes the following steps:

[0067] (1) Image preprocessing: processing the input image The Gaussian filtering denoising formula is as follows:

[0068]

[0069] Where σ is the Gaussian kernel standard deviation, The coordinates of the convolution kernel center are... This represents the convolution operation.

[0070] Then, grayscale normalization is performed, mapping the pixel values ​​to the [0,1] interval. The mapping formula is as follows:

[0071]

[0072] Among them, I min and I max These are the minimum and maximum gray values ​​in the image, respectively.

[0073] (2) Gradient calculation: The horizontal and vertical gradients of the image are calculated using the Roberts operator, and then the gradient magnitude M(x,y) is calculated.

[0074] The horizontal gradient is:

[0075]

[0076] The vertical gradient is:

[0077]

[0078] The gradient magnitude is:

[0079]

[0080] (3) Adaptive threshold segmentation: Divide the image into n×n sub-blocks, and calculate the mean gray value of each sub-block. and standard deviation The adaptive threshold T(x,y) within the sub-block is calculated using the following formula:

[0081]

[0082] Where k is the adjustment coefficient.

[0083] Then, the initial cat-eye region, i.e., the first cat-eye region ROI, is obtained through threshold segmentation:

[0084] ROI={M(x,y)>T(x,y)}

[0085] (4) Morphological post-processing: The first cat-eye region ROI extracted in the preliminary stage is subjected to dilation and erosion operations in sequence to optimize the target shape and obtain the second cat-eye region.

[0086] The expansion operation formula is:

[0087]

[0088] The corrosion operation formula is:

[0089]

[0090] Here, K is a structural element that connects the fractured areas and eliminates minor noise through the above operations.

[0091] (5) Ellipse fitting and screening: Extract the contour of the second cat eye region after morphological processing, fit the ellipse equation using the least squares method, and screen out the final target cat eye region based on the conditions of eccentricity and area.

[0092] The equation of the ellipse is:

[0093]

[0094] The eccentricity rate is:

[0095]

[0096] The area is:

[0097] S∈[S min S max ]

[0098] Among them, S min and S max The lower and upper limits of the set area threshold range.

[0099] In one embodiment of this application, the target calculation unit performs threshold analysis by comparing the signal value corresponding to the obtained target cat eye area with a preset threshold, filtering out pixels with signal values ​​greater than the preset threshold, thereby determining the display screen coordinates of the target object.

[0100] The detection and calculation module 2 adopts a heterogeneous hardware architecture design of DSP+FPGA, and undertakes key tasks such as real-time transmission, high-speed processing, intelligent analysis and precise control of video signals and various control signals.

[0101] Furthermore, after the detection and calculation module 2 obtains the display screen coordinates of the target object, it transmits the display screen coordinates to the main control module 3. The main control module 3 then outlines the display screen coordinates and controls the display module 4 to display them.

[0102] In one embodiment, the display module 4 includes an OLED display screen 41, an eyepiece group 42, and a light-leakage-proof eye shield 43. The OLED display screen 41 is used to display the processed environmental area, target object, and marker frame in real time. On the OLED display screen 41, the target object is marked by a flashing light signal and a red warning marker frame, realizing automatic labeling and visual recognition of the target object. The eyepiece group 42 is designed with a focusing mechanism, and the focusing handwheel allows people with different vision to view the image on the display screen clearly.

[0103] In one embodiment of this application, the device further includes:

[0104] The positioning module is used to determine the actual coordinate information of the target object;

[0105] The positioning module includes a Beidou positioning module 8, an electronic compass 9, and a laser rangefinder 10. The Beidou positioning module 8 is used to locate the latitude and longitude coordinates of its own observation point, the electronic compass 9 is used to display the orientation information of the target object relative to its own observation point in real time, and the laser rangefinder 10 is used to measure the distance of the target object relative to its own observation point.

[0106] In this embodiment, the positioning module includes a BeiDou positioning module 8, an electronic compass 9, and a laser rangefinder 10. The laser rangefinder 10 measures the distance from the target object to the location where the active shortwave infrared sight is mounted, thus obtaining the distance to the target object. The electronic compass 9 displays the azimuth information of the target object relative to the observation point of the active shortwave infrared sight in real time. The BeiDou positioning module 8 is used to locate the latitude and longitude coordinates of the active shortwave infrared sight itself. The BeiDou positioning module 8, in conjunction with the electronic compass 9 and the laser rangefinder 10, can locate the target object and determine its actual coordinate information.

[0107] In one embodiment of this application, the device further includes:

[0108] The data transmission interface is used for program upgrades, data transmission, external display, and product debugging.

[0109] In one embodiment of this application, the device further includes:

[0110] Power module 11 is used for power supply and also has battery reverse connection protection and power monitoring functions.

[0111] In one embodiment of this application, the device further includes:

[0112] The control buttons have indicator icons on their surface for easy operation.

[0113] In one embodiment of this application, the device further includes:

[0114] The housing assembly includes a front panel 5, a middle housing 6, and a rear panel 7, and a sealed cavity is formed inside the housing assembly.

[0115] The detection and calculation module 2 is located inside the sealed cavity; the front panel 5 is provided with a laser emission window and a laser receiving window. The laser emission window is used to emit the detection laser, and the laser receiving window is used to receive the returned detection laser.

[0116] The laser receiving window is equipped with a 1550nm narrowband filter at its front end. The full width at half maximum (FWHM) of the narrowband filter is 10±2nm, and its transmittance is greater than 30%.

[0117] In this embodiment, the housing assembly consists of a front panel 5, a middle housing 6, and a rear panel 7, forming a sealed cavity. Both sides of the middle housing 6 are equipped with buckles for securing the wristband. The front panel 5 has a laser emission window and a laser receiving window for the detection and calculation module 2. The laser emission window emits the detection laser, and the laser receiving window receives the returned detection laser. The target calculation unit and the laser detector are housed within the sealed cavity.

[0118] A 1550nm narrowband filter is added to the front end of the laser receiving window. This filter has a half-width of 10±2nm and a transmittance of more than 30%, which can filter background diffuse reflection and eliminate false alarms.

[0119] In one embodiment of this application, the shortwave infrared objective lens is mounted and fixed on the front panel 5, and the fixing method is a shaft-hole mating end-face fixing method. The shortwave infrared movement is fixed to the rear end of the shortwave infrared objective lens via a lens barrel adapter.

[0120] The detection and calculation module 2 is fixed to the front panel 5 via an adapter bracket.

[0121] In one embodiment, the OLED display screen 41 includes a driver chip and an OLED display. The driver chip is disposed on the main control module 3, and the OLED display is mounted on the inner sidewall of the rear panel 7, directly opposite the eyepiece assembly 42. The driver chip and the OLED display are connected together via a connector. The eyepiece assembly 42 is mounted and fixed to the rear panel 7 via a shaft hole mating end face fixing method. A light leakage prevention eye shield 43 is installed at the rear end of the housing, which serves to prevent the OLED screen image from being obscured under strong light.

[0122] In one embodiment, the Beidou positioning module 8, power module 11, control buttons, etc. are fixed to the intermediate housing 6 by screws and pressure rings, and the electronic compass 9 is mounted on the shortwave infrared objective lens by screws.

[0123] The laser rangefinder 10 is mounted and fixed to the front panel 5 by a laser mounting bracket, and can be slightly adjusted in pitch and orientation relative to the front panel 5 to ensure that the optical axis of the laser rangefinder 10 is aligned with the observation optical axis.

[0124] The data transmission interface is fixed to the front panel 5 by a pressure ring.

[0125] In one embodiment, the main control module 3 is fixed to the front panel 5 and the detection and calculation module 2 by a bracket and screws. The main control module 3 allows the acquired images to be transmitted to the OLED display screen 41. The image from the OLED display screen 41 is projected onto the pupil of the human eye via the eyepiece group 42, allowing electronic compass information, orientation information, and battery level display to be superimposed on the OLED display screen 41. This facilitates real-time display of information, ensuring consistency between the human eye and the display terminal's image, improving adaptability. Furthermore, the compact design of the internal components makes the reconnaissance device small and portable.

[0126] In one embodiment of this application, the front panel 5, the middle housing 6, and the rear panel 7 are sealed together by screws and conductive sealing rings.

[0127] In this embodiment, the front panel 5, the middle shell 6, and the rear panel 7 are sealed together by screws and conductive sealing rings to form a sealed outer shell assembly, which can provide good electromagnetic shielding, effectively prevent current leakage and static electricity accumulation, protect the safe use of the product, and improve the reliability of the product.

[0128] In one embodiment of this application, the device further includes a heat dissipation structure for dissipating heat from the detection and calculation module.

[0129] In one embodiment of this application, a thermally conductive silicone pad is provided on the heat dissipation structure to conduct the heat from the detection and calculation module to the housing assembly of the device for actively detecting short-wave infrared sights.

[0130] In this embodiment, since the target calculation unit and laser detector consume a large amount of power, a heat dissipation structure is provided to cool them. Thermally conductive silicone pads are attached to the heat dissipation structure to quickly transfer heat to the housing assembly, preventing overheating of the detection and calculation module 2 from affecting the overall detection performance.

[0131] In one embodiment of this application, the main control module 3 is further configured to receive user operation instructions, control the shortwave infrared observation module, detection and calculation module, main control module, display module and positioning module according to the user operation instructions, complete the corresponding operation functions, and receive data information and status information from the shortwave infrared observation module, detection and calculation module, main control module, display module and positioning module to monitor the module operation status.

[0132] In this embodiment, the main control module 3 primarily processes video image data, overlays the display interface, and receives user operation commands. It then controls each module to perform its corresponding operation function according to these commands. Simultaneously, it receives data and status information from each module. The OLED display screen 41 displays the processed images and system status information in real time. The main control module 3 also integrates human-computer interaction, monitors the operating status of each module, and schedules tasks for other modules.

[0133] The main interface of the device for actively detecting short-wave infrared sights in this embodiment of the application is as follows: Figure 3 As shown, Figure 3 In the diagram, 101 represents the "Photo / Video" button icon, 102 represents the "Menu" function button icon, 103 represents the "Range Measurement" button icon, 104 represents the "Detection" button icon, and 105 represents the marker for the detected shortwave infrared sight.

[0134] In one embodiment, Figure 6 This is a schematic diagram illustrating the working principle of a device for actively detecting short-wave infrared sights. In this embodiment, through experimental verification, a simulator is used to read data values ​​of the target object captured by the CCD in the system's receiving component from the main processor memory. The data is then used MATLAB to create easily observable charts. Figure 4 , Figure 5 The images shown are comparison charts of image differential data when detecting shortwave infrared sights at 200m and 500m. Figure 4 and Figure 5 As can be seen, affected by factors such as atmospheric background radiation, transmittance, scattering and absorption, and turbulence, the signal-to-noise ratio is further improved after active and passive image differential processing, making it easier to extract the target signal from the detected sight. Figure 4 , Figure 5 (Purple box in the middle). At close range and in simple background environments, the difference between active and passive image differential data is not particularly noticeable. However, at long range and in complex background environments, the signal-to-noise ratio of the active and passive image difference data is significantly improved, making it easier to identify the true target and reducing the false alarm rate. The image obtained using the "background difference" between the active and passive images allows the influence of ambient light intensity to be ignored. This image is compared with a preset criterion to determine the pixel corresponding to the strongest signal. The spatial coordinates of this pixel are the position of the shortwave infrared sight.

[0135] In one embodiment, the operator removes the active shortwave infrared detection scope and its battery from the product box, opens the battery compartment cover, inserts the battery into the battery compartment according to the correct positive and negative markings, and tightens the battery compartment cover. The active shortwave infrared detection scope is then set up handheld or on a tripod, powered on, and after the power-on self-test is completed, the target area is observed and detected.

[0136] In one embodiment, the working principle diagram of the device for actively detecting short-wave infrared sights is as follows: Figure 7 As shown,

[0137] The shortwave infrared observation module is used to observe the surrounding area to determine if there are any observable targets. If observable targets are found, the BeiDou positioning module is activated to obtain latitude and longitude coordinates, the electronic compass is activated to obtain azimuth information, and the laser rangefinder is activated to measure the distance to the target.

[0138] If no target object can be observed, the detection and calculation module is activated to actively scan and detect the target object. It determines whether a target object exists. If no target object exists, the system returns to using the shortwave infrared observation module to observe the surrounding area. If a target object exists, the BeiDou positioning module is activated to obtain its latitude and longitude coordinates, the electronic compass is activated to obtain its azimuth information, and the laser rangefinder is activated to measure the distance to the target object.

[0139] After activating the BeiDou positioning module to obtain latitude and longitude coordinates, activating the electronic compass to obtain azimuth information, and activating the laser rangefinder to measure the distance to the target object, the actual coordinate information of the target object is obtained, and information is reported and decisions are made.

[0140] The active detection shortwave infrared sight device of this application embodiment has functions such as long-distance observation, detection and positioning. The shortwave infrared observation module used can improve the imaging quality of the device when there is sufficient light during the day and can also perform fog-penetrating observation. Shortwave infrared is less affected by environmental factors, and at night, it can also detect most materials by using atmospheric glow and night sky light, thus expanding the application range of the device.

[0141] The active detection device for shortwave infrared sights in this application embodiment can not only effectively detect and automatically mark the spatial orientation and distance of hostile shortwave sights, but also correctly identify targets and effectively eliminate interfering targets within the field of view. While ensuring the accuracy of imaging detection, it also has anti-interference capabilities for non-imaging detection. Through active and passive image differential, it can identify subtle characteristics of targets, thereby identifying and eliminating non-observation sight targets. In complex backgrounds, it can detect potential threat sources at long distances, over a wide area, and with high probability, quickly discover and accurately locate them, and ensure rapid detection when targets appear and minimal or no false alarms when no targets are present.

[0142] The laser detector in the detection and calculation module of this application uses the 1530nm to 1560nm band, which has significant advantages in the fields of active laser reconnaissance and laser countermeasures. This band of laser detector has the following advantages in photoelectric counter-reconnaissance: it is located in the atmospheric transmission window, with a long transmission distance; it has weak atmospheric scattering, resulting in good detection performance in adverse weather conditions; it is stealthy from traditional low-light night vision equipment, enabling all-weather reconnaissance; there are mature detectors available, allowing for the construction of a complete application system; and the 1.4μm to 1.6μm band of laser is safe for the human eye, avoiding accidental injury.

[0143] The active shortwave infrared sight device of this application embodiment utilizes the BeiDou positioning module in the positioning module to provide the operator with location and time information. Combined with an electronic compass and laser rangefinder, it comprehensively applies high-precision satellite positioning technology, laser ranging technology, and digital compass angle parameter measurement technology to achieve precise target positioning. Simultaneously, the device can also perform target guidance. Using the known target and its own BeiDou positioning information, it performs coordinate transformation during the positioning guidance process using a homogeneous coordinate transformation method, combined with compass orientation, to obtain target positioning guidance data.

[0144] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0145] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A device for actively detecting shortwave infrared sights, characterized in that, include: The system includes a shortwave infrared observation module, a detection and calculation module, a main control module, and a display module. The short-wave infrared observation module is used to acquire images of the environmental area. The detection and calculation module includes a target calculation unit and a laser detector. The laser detector is used to emit a detection laser, capture the detection laser returned by the target object within the environmental area, and capture the position information of the returned detection laser. It also enhances the returned detection laser through signal processing. The target calculation unit is used to determine the display screen coordinates corresponding to the target object based on the first image and the second image acquired by the short-wave infrared observation module using image difference and threshold analysis methods. The unit then sends the display screen coordinates to the main control module. The first image is the image acquired by the short-wave infrared observation module when the laser detector emits the detection laser, and the second image is the image acquired by the short-wave infrared observation module when the laser detector does not emit the detection laser. The main control module is used to outline the coordinates of the display screen and control the display module to display the environmental area, the target object, and the outline. The target object is a short-wave infrared sight. The target solution unit performs image differencing in the following ways: Gaussian filtering is applied to the input image to remove noise, the input image including the first image and the second image; The gradient magnitude of the input image is calculated using the Roberts operator; The input image is divided into multiple sub-blocks. For each sub-block, the mean gray value and standard deviation of the sub-block are calculated, and an adaptive threshold within the sub-block is calculated based on the mean gray value and the standard deviation. The first cat's eye region is obtained by segmenting the input image using the gradient magnitude and the adaptive threshold. The first cat-eye region is subjected to morphological post-processing to obtain the second cat-eye region. The contour of the second cat's eye region is extracted, and the ellipse equation is fitted using the least squares method. The target cat's eye region is then selected based on the conditions of eccentricity and area.

2. The device for active detection shortwave infrared sights according to claim 1, characterized in that, The threshold analysis method for the target solution unit includes: The signal value corresponding to the target cat's eye area is compared with a preset threshold, and pixels with signal values ​​greater than the preset threshold are filtered out, thereby determining the display screen coordinates of the target object.

3. The device for active detection shortwave infrared sights according to claim 1, characterized in that, The shortwave infrared observation module includes a shortwave infrared core and a shortwave infrared objective lens. The frame rate of the shortwave infrared objective lens is matched with the emission frequency of the laser detector and is clock-synchronized by the main control module.

4. The device for active detection shortwave infrared sights according to claim 1, characterized in that, Also includes: A housing assembly, comprising a front panel, a middle housing, and a rear panel, wherein a sealed cavity is formed within the housing assembly; The detection and calculation module is located inside the sealed cavity; the front panel is provided with a laser emitting window and a laser receiving window, the laser emitting window is used to emit detection laser, and the laser receiving window is used to receive the returned detection laser.

5. The device for active detection shortwave infrared sights according to claim 4, characterized in that, The front panel, the middle housing, and the rear panel are sealed together by screws and conductive sealing rings; The laser detector uses a wavelength range of 1530nm to 1560nm. The front end of the laser receiving window is provided with a 1550nm narrowband filter, the half width at half maximum (WWHM) of the narrowband filter is 10±2nm, and the transmittance is greater than 30%.

6. The device for active detection shortwave infrared sights according to claim 1, characterized in that, Also includes: A heat dissipation structure is provided for dissipating heat from the detection and calculation module.

7. The device for active detection shortwave infrared sights according to claim 6, characterized in that, The heat dissipation structure is equipped with a thermally conductive silicone pad, which is used to conduct the heat of the detection and calculation module to the housing assembly of the active detection short-wave infrared sight.

8. The device for an active detection shortwave infrared sight according to any one of claims 1 to 7, characterized in that, Also includes: The positioning module is used to determine the actual coordinate information of the target object; The positioning module includes a BeiDou positioning module, an electronic compass, and a laser rangefinder. The BeiDou positioning module is used to locate the latitude and longitude coordinates of its own observation point. The electronic compass is used to display the orientation information of the target object relative to its own observation point in real time. The laser rangefinder is used to measure the distance of the target object relative to its own observation point.

9. The device for active detection shortwave infrared sights according to claim 8, characterized in that, The main control module is also used to receive user operation instructions, control the shortwave infrared observation module, the detection and calculation module, the main control module, the display module, and the positioning module according to the user operation instructions to complete the corresponding operation functions, and receive data information and status information from the shortwave infrared observation module, the detection and calculation module, the main control module, the display module, and the positioning module to monitor the module operation status.

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