A thermal imager and its display control method

Abstract

This disclosure presents a thermal imager and its display control method, relating to the field of imaging technology. The thermal imager includes an infrared imaging module, a visible light imaging module, a main control board, and a touch screen. The main control board acquires infrared and visible light images, establishes a unified display coordinate system and the initial display coordinates corresponding to the infrared image, receives display coordinate adjustment commands output by directional keys, and updates display coordinate offset parameters according to these commands. It also updates the display starting coordinates corresponding to the infrared image based on the display coordinate offset parameters and synchronously overlays and updates the infrared and visible light images to generate a dual-light fused image after display coordinate registration. After completing display coordinate registration, it stores and calls the corresponding display coordinate offset parameters to achieve automatic alignment and display of the infrared and visible light images. This disclosure solves the problem of display coordinate deviation between infrared and visible light images in thermal imagers.

Description

Technical Field

[0001] This disclosure relates to the field of imaging technology, and in particular to a thermal imager and its display control method. Background Technology

[0002] Infrared thermal imaging technology is a non-contact temperature measurement technology that detects the infrared radiation emitted by the surface of a target object and converts it into a visual image of temperature distribution. Because it can achieve rapid and intuitive temperature detection without contacting the object being measured, it has been widely used in fields such as industrial manufacturing, power line inspection, building inspection, equipment maintenance, automobile repair, and refrigeration system testing.

[0003] In existing technologies, thermal imagers typically include infrared detectors, optical lenses, image processing modules, and display devices. They generate corresponding thermal images by acquiring infrared radiation signals from target objects in the 8-14μm wavelength range and visualize the temperature distribution using different pseudo-color modes. To improve target recognition capabilities, infrared imaging modules and visible light imaging modules are integrated into the same device, and infrared images, visible light images, or a fused image of both are output through a display terminal, thereby achieving synchronous presentation of temperature information and target appearance information. However, due to differences in optical structure, installation position, field of view, and imaging principles between infrared and visible light imaging modules, the images acquired by the two modules often exhibit spatial discrepancies. For example, different lens focal lengths and field of view (such as inconsistent infrared and visible light field of view) can lead to differences in the position, scale, and shape of the same target in the two images, making precise superposition difficult.

[0004] Therefore, existing thermal imagers suffer from a problem where the infrared and visible light images deviate in display coordinates during infrared and visible light imaging processes. Summary of the Invention

[0005] The purpose of this disclosure is to provide a thermal imager and its display control method, which solves the problem that the infrared image and the visible light image have deviations in display coordinates during the infrared imaging and visible light imaging processes of existing thermal imagers.

[0006] To achieve this objective, the present disclosure adopts the following technical solution: According to a first aspect, this disclosure provides a display control method for a thermal imager, comprising: Step S1: Obtain the infrared image output by the infrared imaging module and the visible light image output by the visible light imaging module, and place the infrared image and the visible light image in the same display coordinate system to establish the initial display coordinates corresponding to the infrared image; Step S2: In response to the selection command of the fusion display interface, one of the visible light image and the infrared image is displayed as a background image, and the other is displayed as an overlay image on the background image to form a dual-light fusion image; Step S3: Receive the display coordinate adjustment command output by the directional keys, and update the display coordinate offset parameter corresponding to the infrared image according to the display coordinate adjustment command. The display coordinate offset parameter includes a horizontal offset Δx and a vertical offset Δy. Step S4: Update the display start coordinates corresponding to the infrared image according to the updated horizontal offset Δx and vertical offset Δy, and display the infrared image based on the updated display start coordinates, so that the display coordinates of the infrared image relative to the visible light image are compensated along the horizontal and / or vertical axes; at the same time, the adjusted infrared image and the visible light image are synchronously superimposed and updated to generate a dual-light fusion image after display coordinate registration.

[0007] According to a second aspect, this disclosure provides a thermal imager employing the method described in the first aspect, comprising an infrared imaging module, a visible light imaging module, a main control board, and a touch display screen; the main control board is used to receive infrared images output by the infrared imaging module and visible light images output by the visible light imaging module, and to control the display of the infrared images and visible light images in the same display coordinate system.

[0008] Optionally, the main control board is also used to perform semi-transparent display processing on the infrared image when the infrared image and the visible light image are superimposed and displayed, so that the overlapping area of ​​the infrared image and the visible light image can be displayed simultaneously, so that the user can observe the overlapping area of ​​the two and adjust the display coordinates.

[0009] Optionally, the thermal imager also includes directional keys, and the main control board is further configured to periodically update the display coordinate offset parameters according to a preset step amount when receiving continuous input from the directional keys, and continuously update the display start coordinates corresponding to the infrared image based on the updated display coordinate offset parameters.

[0010] Optionally, the directional keys are touch-sensitive directional keys, and the main control board updates the display coordinate offset parameters according to the directional signal output by the touch signal input circuit, and updates the display start coordinates corresponding to the infrared image based on the updated display coordinate offset parameters.

[0011] Optionally, the main control board is also used to establish corresponding display coordinate offset parameter records for different working modes, lens configurations or field of view modes, and to call the corresponding display coordinate offset parameters when switching working modes, so as to realize automatic alignment display of infrared images and visible light images under different working conditions.

[0012] Optionally, the thermal imager further includes a wireless communication module, which is electrically connected to the main control board; The main control board is also used to establish a wireless connection with the mobile terminal through the wireless communication module, send the infrared image, the visible light image and temperature measurement data to the mobile terminal, and receive control commands sent by the mobile terminal to control the image mode switching, temperature unit setting, pseudo-color mode selection, emissivity adjustment and temperature measurement level switching of the touch screen.

[0013] Optionally, it also includes a first housing and a second housing, wherein the infrared imaging module, the visible light imaging module, the main control board and the touch screen are installed in the accommodating space formed by the first housing and the second housing; The second outer shell is provided with a cover plate, and a third outer shell is snapped onto the second outer shell. The third outer shell is provided with a first light-transmitting hole and a second light-transmitting hole. The first light-transmitting hole is positioned corresponding to the position of the infrared imaging module so that the infrared imaging module can perform imaging. The second light-transmitting hole is positioned corresponding to the position of the visible light imaging module so that the visible light imaging module can perform imaging.

[0014] Optionally, the cover plate is provided with a reset hole and a heat dissipation hole, which are respectively provided with the infrared imaging module and the visible light imaging module to provide directional heat dissipation for the infrared imaging module and the visible light imaging module.

[0015] Optionally, the first outer shell and the second outer shell are fitted together with a protective sleeve, and the side wall of the protective sleeve is provided with anti-slip grooves.

[0016] Optionally, a mounting nut for threaded connection with an external bracket is provided between the first housing and the second housing. The mounting nut has a positioning groove, and the first housing has a positioning block that positions and engages with the positioning groove.

[0017] Optionally, a memory card slot and a charging port are provided between the first housing and the second housing. The memory card slot is used to insert a TF card, and the charging port is a Type-C interface used to charge the thermal imager.

[0018] Compared with the prior art, this disclosure has the following beneficial effects: By introducing a display coordinate adjustment mechanism based on directional key input into the main control board, the display coordinates of the infrared image can be flexibly offset laterally and / or vertically in the fused display interface. This allows for real-time display coordinate compensation and correction of the infrared image relative to the visible light image, effectively solving the problem of display coordinate deviation caused by differences in optical structure, installation position, and field of view between the infrared and visible light imaging modules. Furthermore, this disclosure requires no complex modifications to the hardware structure or reliance on costly automatic registration algorithms; rapid alignment of dual-light images can be achieved through simple human-computer interaction. In addition, accurate registration of the infrared and visible light images significantly improves the consistency and correspondence between temperature information and target appearance information in the fused image, enhancing the accuracy and detection efficiency of target recognition, thereby increasing the practicality and reliability of the equipment in industrial inspection, power line inspection, and equipment maintenance applications. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this disclosure. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this disclosure can produce, should still fall within the scope of the technical content disclosed herein.

[0021] Figure 1 A flowchart illustrating a display control method for a thermal imager provided in this embodiment of the present disclosure; Figure 2 This is a front-view stereoscopic structural diagram of a thermal imager provided in an embodiment of the present disclosure; Figure 3 A rear-view stereoscopic structure diagram of a thermal imager provided in an embodiment of this disclosure; Figure 4 A cross-sectional structural schematic diagram of a thermal imager provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of the exploded structure of a thermal imager provided in an embodiment of the present disclosure; Figure 6 This is a schematic diagram of the internal structure of a thermal imager provided in an embodiment of the present disclosure; Figure 7 A partial structural schematic diagram of a thermal imager provided in an embodiment of this disclosure; Figure 8 A schematic diagram of the circuit principle of the main control board in a thermal imager provided in an embodiment of this disclosure; Figure 9 A schematic diagram of the circuit principle of an infrared imaging module in a thermal imager provided in an embodiment of this disclosure; Figure 10 This is a schematic diagram of the circuit principle of a visible light imaging module in a thermal imager provided in an embodiment of the present disclosure.

[0022] Illustration: 11. First outer shell; 111. Positioning block; 12. Second outer shell; 13. Third outer shell; 131. First light-transmitting hole; 132. Second light-transmitting hole; 14. Cover plate; 141. Reset hole; 142. Heat dissipation hole; 15. Protective sleeve; 151. Anti-slip groove; 16. Mounting nut; 161. Positioning groove; 17. Memory card slot; 18. Charging port; 20. Infrared imaging module; 30. Visible light imaging module; 40. Main control board; 50. Touch screen; 60. Wireless communication module. Detailed Implementation

[0023] To make the inventive objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0024] The technical solution of this disclosure will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] This disclosure provides a display control method for a thermal imager, such as... Figure 1 As shown, it includes: Step S1: Acquire the infrared image output by the infrared imaging module 20 and the visible light image output by the visible light imaging module 30, and place the infrared image and the visible light image in the same display coordinate system to establish the initial display coordinates corresponding to the infrared image.

[0026] Specifically, the infrared imaging module 20 is used to acquire the infrared radiation information of the target object and generate the corresponding infrared image; the visible light imaging module 30 is used to acquire the visible light image of the target object. The main control board 40 receives the infrared image and the visible light image respectively, and performs display coordinate mapping processing on the two images based on a unified display resolution, display area and display coordinate parameters, so that the infrared image and the visible light image can be superimposed and displayed on the same display interface.

[0027] In one embodiment, after completing the display coordinate mapping between the infrared image and the visible light image, the main control board 40 determines the display coordinate position corresponding to the upper left corner of the infrared image as the initial display coordinate, which is used as the reference position for subsequent display coordinate offset adjustment.

[0028] It should be noted that, due to differences in installation position, lens focal length, field of view, and imaging principle between the infrared imaging module 20 and the visible light imaging module 30, the display coordinates of the same target in the two images usually deviate. Therefore, unifying the infrared and visible light images into the same display coordinate system provides a basis for subsequent steps such as image display coordinate adjustment and dual-light image registration.

[0029] Step S2: In response to the selection command of the fusion display interface, one of the visible light image and the infrared image is displayed as the background image, and the other is displayed as an overlay image on the background image to form a dual-light fusion image.

[0030] Specifically, the main control board 40 controls the touch screen 50 to enter the fusion display interface according to the image mode switching command input by the user. In this mode, the main control board 40 can display a visible light image as the background image and an infrared image as an overlay image on the background image; or display an infrared image as the background image and a visible light image as an overlay image on the background image.

[0031] Furthermore, during the overlay display process, the main control board 40 can also adjust the transparency of the overlay image so that the overlapping area of ​​the background image and the overlay image can be displayed synchronously, thereby making it easier for users to observe the correspondence between the two images.

[0032] Step S3: Receive the display coordinate adjustment command output by the directional keys, and update the display coordinate offset parameters corresponding to the infrared image according to the display coordinate adjustment command. The display coordinate offset parameters include the horizontal offset Δx and the vertical offset Δy.

[0033] Specifically, the directional keys are used to receive user input commands to move up, down, left, and right. After receiving the corresponding directional adjustment command, the main control board 40 updates the lateral offset Δx and / or the longitudinal offset Δy according to the corresponding direction.

[0034] In one embodiment, when continuous input of the directional keys is detected, the main control board 40 periodically performs a display coordinate offset update operation according to a preset step amount, so as to realize continuous display coordinate offset update of the infrared image, thereby improving the smoothness and accuracy of display coordinate adjustment.

[0035] Step S4: Update the display start coordinates corresponding to the infrared image according to the updated horizontal offset Δx and vertical offset Δy, and display the infrared image based on the updated display start coordinates to compensate the display coordinates of the infrared image relative to the visible light image along the horizontal and / or vertical directions; at the same time, synchronously overlay and update the adjusted infrared image and the visible light image to generate a dual-light fusion image after display coordinate registration.

[0036] Specifically, the main control board 40 calculates the updated display starting coordinates of the infrared image based on the initial display coordinates and the updated horizontal offset Δx and vertical offset Δy, and re-displays the infrared image based on the updated display starting coordinates; at the same time, the adjusted infrared image and the visible light image are synchronously superimposed and updated to generate a dual-light fusion image after display coordinate registration.

[0037] As the infrared image is gradually updated with offset on the display interface, the corresponding target in the infrared image and the visible light image gradually overlaps, thus achieving display coordinate registration between the two images. After the display coordinate registration is completed, the main control board 40 generates a dual-light fusion image with registered display coordinates to achieve the corresponding display between temperature information and target appearance information.

[0038] It should be noted that the display coordinate registration in this disclosure is not an automatic registration method based on complex image recognition algorithms, but rather a human-computer interactive image display coordinate compensation and correction method based on display coordinate offset. By adjusting the offset of the infrared image display coordinates, display coordinate compensation and calibration between the infrared and visible light images can be achieved without changing the hardware structure or introducing high-cost automatic registration algorithms, thereby improving the display accuracy of the dual-light fusion image.

[0039] Step S5: After completing the display coordinate registration of the infrared image and the visible light image, the corresponding display coordinate offset parameters are stored. When entering the fusion display interface later, the display coordinate offset parameters are called to compensate the display coordinates of the infrared image, so as to realize the automatic alignment and display of the infrared image and the visible light image.

[0040] In one embodiment, when the user triggers a confirmation operation, exits the fused display interface, or stops input for more than a preset time, the main control board 40 determines that the current display coordinate registration is complete and stores the current display coordinate offset parameters.

[0041] This disclosure also provides a thermal imager, such as... Figures 2 to 10 As shown, the thermal imager includes an infrared imaging module 20, a visible light imaging module 30, a main control board 40, and a touch screen 50. The main control board 40 is used to receive the infrared images acquired by the infrared imaging module 20 and the visible light images acquired by the visible light imaging module 30, and to control the touch screen 50 to selectively display single infrared images, single visible light images, and dual-light fused images. In the fusion display interface, the main control board 40 is used to display one of the visible light image and the infrared image as the background image, and to overlay the other image on the background image to form a dual-light image under the same display interface.

[0042] It should be noted that by introducing a display coordinate adjustment mechanism based on directional key input into the main control board 40, the display coordinates of the infrared image can be flexibly offset laterally and / or vertically under the fused display interface. This allows the infrared image to undergo real-time display coordinate compensation and correction relative to the visible light image, effectively solving the problem of display coordinate deviation caused by differences in optical structure, installation position, and field of view between the infrared imaging module 20 and the visible light imaging module 30. Furthermore, this disclosure requires no complex modifications to the hardware structure and does not rely on costly automatic registration algorithms; rapid alignment of dual-light images can be achieved through simple human-computer interaction. In addition, by achieving accurate registration between the infrared and visible light images, the consistency and correspondence between temperature information and target appearance information in the fused image can be significantly improved, enhancing the accuracy and detection efficiency of target recognition, thereby increasing the practicality and reliability of the equipment in applications such as industrial inspection, power line inspection, and equipment maintenance.

[0043] In one embodiment, the main control board 40 is further configured to perform semi-transparent display processing on the infrared image when the infrared image and the visible light image are superimposed, so that the overlapping areas of the infrared image and the visible light image can be displayed simultaneously. This allows the user to intuitively observe the overlapping area, facilitating the adjustment of the position of the infrared image based on the overlap, thereby improving the adjustment efficiency and calibration accuracy in the display coordinate registration process. This disclosure does not merely employ semi-transparent display, but rather uses this display method to achieve synchronous visualization of the overlapping area of ​​the two-light images, assisting in the display coordinate calibration process. Without introducing complex algorithms or changing the hardware structure, this disclosure achieves dual-light image display coordinate calibration through a display coordinate offset and superposition update mechanism, and improves the accuracy of image display coordinate adjustment by combining the visualization of the overlapping area. This represents a low-cost display coordinate registration technology solution with practical application value.

[0044] like Figures 4 to 6As shown, the main control board 40 is also used to gradually adjust the display coordinates of the infrared image on the display interface according to a preset step size when receiving continuous input from the directional keys, so as to realize continuous adjustment of the display coordinates of the infrared image relative to the visible light image. The preset step size refers to the offset distance of the infrared image on the display interface corresponding to each display coordinate offset update operation performed by the main control board 40 when receiving one or continuous input from the directional keys. This step size can be understood as the smallest adjustment unit of the infrared image in the horizontal and / or vertical directions. Its size can be preset according to the display resolution, image size, or actual application requirements to balance adjustment accuracy and adjustment efficiency.

[0045] In practice, the main control board 40 is configured to gradually adjust the infrared image display coordinates according to a preset step size when receiving continuous input from the directional keys. This allows for continuous and smooth adjustment of the infrared image's display coordinates relative to the visible light image. Compared to a one-time large displacement adjustment, this method enables more precise registration control, avoiding alignment errors caused by image jumps. Simultaneously, the gradual adjustment mechanism based on preset step sizes allows users to observe the fusion effect in real time during adjustment, gradually approaching the optimal registration position. This improves the accuracy of display coordinate alignment and the controllability of operation, enhancing the human-computer interaction experience. This continuous adjustment method balances adjustment efficiency and precision, ensuring a smooth adjustment process while reducing the difficulty of manual calibration. It facilitates rapid and accurate matching of infrared and visible light images in different usage scenarios, further enhancing the practicality and stability of the equipment.

[0046] In one embodiment, the main control board 40 has a pre-stored step parameter table. The preset step size can be set to a fixed pixel value, such as 1 pixel, 2 pixels, or 5 pixels. When the user presses the directional key once, the main control board 40 generates a display coordinate update control signal according to the corresponding direction, causing the infrared image to be updated with a preset step size in the corresponding direction. When the directional key is continuously pressed, the main control board 40 periodically generates a display coordinate update control signal at a set time interval (e.g., every 50ms or 100ms), and updates the infrared image with a superimposed display coordinate offset according to the preset step size in each cycle, thereby realizing continuous display coordinate offset updates of the infrared image on the display interface.

[0047] Furthermore, the preset step size can also be set as an adjustable parameter. For example, a step size selection interface can be provided through the touch display 50, allowing users to select different step sizes according to their actual alignment accuracy requirements, such as "coarse adjustment mode" (larger step size, such as 5~10 pixels) and "fine adjustment mode" (smaller step size, such as 1~2 pixels), so as to flexibly switch between initial fast alignment and subsequent fine calibration.

[0048] In one embodiment, such as Figure 8 As shown, the main control board 40 is implemented using a main control processor with an image acquisition interface, a display driver interface, and various peripheral interfaces. The main control processor is connected to the infrared imaging module 20, the visible light imaging module 30, the touch screen 50, the wireless communication module 60, and the storage circuit to form the signal processing and control core of the entire device. The main control board 40 is used to receive image data output by the visible light imaging module 30 and infrared image data or pre-processed temperature image data output by the infrared imaging module 20. At the same time, the main control board 40 is also used to perform display coordinate mapping, overlay update, and display coordinate adjustment control on the two images, thereby realizing the calibration of the relative position relationship between the infrared image and the visible light image at the display end. The circuit containing the main control board 40 is equipped with a main control chip, an external storage interface, a display data interface, and an image acquisition interface, which can provide the hardware foundation for the acquisition, buffering, processing, and output of dual-light images.

[0049] In one embodiment, such as Figures 8 to 10 As shown, the visible light imaging module 30 is connected to the main control board 40 via a parallel image acquisition interface. The main control board 40 receives visible light image data through pixel clock signals, field synchronization signals, line synchronization signals, and multi-bit image data lines, and performs reset, power-on timing control, and register configuration on the visible light imaging module 30 through control signals. The visible light imaging module circuit uses an image sensor module and is connected to the main control board 40 via data lines, clock lines, and control lines, enabling the main control board 40 to acquire visible light images in real time and use them as one of the background or overlaid images in the dual-light fusion image. By directly connecting the visible light imaging module 30 to the main control board 40, intermediate conversion steps can be reduced, improving the stability of image acquisition timing and display response speed, which is beneficial for subsequent dual-light image display coordinate adjustment and fusion display.

[0050] In one embodiment, the infrared imaging module 20 is connected to the main control board 40 via an image data interface or a serial control interface. The main control board 40 provides the infrared imaging module 20 with operating power, enable control signals, and configuration control signals, enabling the infrared imaging module 20 to output corresponding infrared image data or temperature distribution data. After receiving the data output by the infrared imaging module 20, the main control board 40 converts it into an infrared image suitable for display and overlays and updates it with the visible light image in the same display coordinate system. By directly connecting the infrared imaging module 20 to the main control board 40 and having the main control board 40 uniformly complete the acquisition and display control of the two images, the involvement of additional peripheral processors in the dual-light image registration process can be avoided, thereby reducing the system's structural complexity and improving the consistency of image fusion control.

[0051] In one embodiment, the touch display screen 50 is connected to the main control board 40 via a parallel display interface. The main control board 40 outputs a display clock, synchronization control signals, and multiple color data lines to the touch display screen 50 to drive the touch display screen 50 to display a single infrared image, a single visible light image, and a dual-light fused image. The display circuit includes a display interface and a backlight driving circuit. The main control board 40 can select and output different display data based on image mode switching instructions. In the fused display interface, it updates the display by using one of the infrared image and the visible light image as the background image and the other as the overlay image. Furthermore, the main control board 40 can also perform semi-transparent display processing on the infrared image during overlay display, so that the overlapping area of ​​the infrared image and the visible light image can be synchronously visualized, thereby providing users with an intuitive basis for registration observation and improving the accuracy of display coordinate adjustment.

[0052] In one embodiment, such as Figures 2 to 7 As shown, the directional keys are touch-sensitive and are connected to the main control board 40 via a touch signal input circuit. The main control board 40 updates the display coordinate offset parameters based on the direction signal output by the touch signal input circuit. In other embodiments, the directional keys can also be physical buttons.

[0053] In practical implementation, by setting the directional keys as touch-sensitive keys and connecting them to the main control board 40 via a touch signal input circuit, the main control board 40 can update the corresponding display coordinate offset parameters according to the directional signals output by the touch signal input circuit, thereby adjusting the infrared image display coordinates. Compared with traditional mechanical button structures, touch-sensitive directional keys have the advantages of simple structure, no mechanical wear, and sensitive response, which can effectively improve the reliability and service life of input. At the same time, the touch signal input method can achieve faster response, which is beneficial to improving the real-time performance and smoothness of infrared image display coordinate adjustment. The touch-sensitive directional keys and the touch display screen 50 can be easily integrated into a single design, which helps to reduce the overall size of the device, optimize the appearance structure of the equipment, and improve the convenience of human-computer interaction and the operating experience. Users can input directions by touching or sliding, making the adjustment of image display coordinates more intuitive and flexible, thereby further improving the efficiency and accuracy of the infrared image and visible light image registration process.

[0054] In one embodiment, the input circuit corresponding to the directional keys includes a touch button signal input circuit and an auxiliary control circuit. The touch button signal input circuit converts the user's touch input into a directional signal and outputs it to the main control board 40. The main control board 40 updates the corresponding display coordinate offset parameters according to the input in different directions, and adjusts the display coordinates of the infrared image in the display interface by horizontal and / or vertical offset. A touch detection signal line and an enable control signal line are provided between the touch input circuit and the main control board 40, thereby realizing touch direction input, status detection, and input enable control. By combining the touch input circuit with the display coordinate compensation adjustment logic, the electronic control adjustment of the infrared image display coordinates can be realized without adding a complex mechanical adjustment structure, making the registration process of dual-light fusion image more flexible and easier to operate.

[0055] like Figures 2 to 7 As shown, the main control board 40 is also used to store the corresponding display coordinate offset parameters after completing the display coordinate registration of the infrared image and the visible light image, and to call the display coordinate offset parameters when displaying the dual-light fused image in the future, so as to realize the automatic alignment display of the infrared image and the visible light image. The display coordinate offset parameter refers to the data parameter used to describe the position offset of the infrared image relative to the visible light image in the display interface, which usually includes the horizontal offset (Δx) and the vertical offset (Δy), and the unit can be pixels or display coordinate units. This display coordinate offset parameter is used to compensate the display coordinates of the infrared image during the image display process, so as to realize the spatial alignment of the two images. Display coordinate registration refers to the process of aligning the spatial positions of the infrared image and the visible light image in the same display interface, so that the corresponding targets in the two images are visually as similar as possible, thereby realizing the correspondence between temperature information and appearance information.

[0056] In practice, after registering the display coordinates of the infrared and visible light images, the corresponding display coordinate offset parameters are stored. These parameters are then directly invoked when the fusion display interface is accessed again, enabling automatic alignment of the infrared and visible light images. Therefore, users can obtain a calibrated fusion effect without manual adjustment each time, significantly reducing repetitive operations and improving ease of use and work efficiency. Furthermore, by reusing historical registration parameters, the consistency of image overlay positions under different usage scenarios is ensured, avoiding error fluctuations caused by manual adjustments, thereby improving the stability and reliability of display coordinate registration.

[0057] In one embodiment, after the user completes the alignment adjustment of the infrared image and the visible light image using the directional keys, the main control board 40 obtains the horizontal offset Δx and vertical offset Δy of the current infrared image relative to the initial display coordinate position, and stores Δx and Δy as display coordinate offset parameters in a non-volatile memory (such as EEPROM or Flash memory). In subsequent use, when the user selects the fused display interface again, the main control board 40 automatically reads the corresponding display coordinate offset parameters from the non-volatile memory and performs offset processing on the display coordinates of the infrared image based on these parameters, so that the infrared image is compensated for display coordinates according to the stored offset, thereby directly achieving aligned display with the visible light image. The display coordinate offset parameters can be associated with different working modes or lens configurations and stored separately. For example, when the device supports different focal length lenses or different field-of-view modes, the main control board 40 can establish corresponding offset parameter records for each mode and call the corresponding parameters when switching modes to ensure accurate alignment under different working conditions.

[0058] like Figure 4 and Figure 6 As shown, the thermal imager also includes a wireless communication module 60, which is electrically connected to the main control board 40. The main control board 40 is also used to establish a wireless connection with the mobile terminal through the wireless communication module 60, and to send infrared images, visible light images and temperature measurement data to the mobile terminal. It also receives control commands sent by the mobile terminal to control the image mode switching, temperature unit setting, pseudo-color mode selection, emissivity adjustment and temperature measurement level switching of the touch screen 50.

[0059] The wireless communication module 60 is a functional module used to realize wireless data transmission between the thermal imager and external devices (such as mobile terminals like mobile phones and tablets), and can use communication methods such as Wi-Fi, Bluetooth, and NFC. The mobile terminal refers to a portable electronic device with display and interactive capabilities, such as a smartphone or tablet, used to receive data sent by the thermal imager and send control commands to it. Temperature measurement data refers to the target temperature information collected by the infrared imaging module 20 and processed by the main control board 40, including point temperature and area temperature (highest / lowest / average temperature). Emissivity adjustment refers to adjusting the emissivity parameter in the infrared temperature measurement calculation according to the material characteristics of the object being measured, in order to improve the accuracy of temperature measurement. Pseudo-color mode refers to a display method that maps different temperature ranges to different colors, used to enhance the visualization of temperature distribution.

[0060] In practical implementation, a wireless communication module 60 is set up, and the main control board 40 establishes a wireless connection with the mobile terminal through this module 60 to achieve remote transmission of infrared images, visible light images, and temperature measurement data. Simultaneously, it receives control commands sent by the mobile terminal, thereby enabling remote control of the device's functions. Therefore, users do not need to directly operate the thermal imager itself; they can perform operations such as image mode switching, temperature unit setting, pseudo-color mode selection, emissivity adjustment, and temperature measurement level switching via the mobile terminal. This significantly improves the operational flexibility and convenience of the device, making it particularly suitable for application scenarios where close-range manual operation is inconvenient, such as high altitudes, confined spaces, or hazardous environments.

[0061] In one embodiment, the wireless communication module 60 is connected to the main control board 40 via a USB interface or other high-speed communication interface. The main control board 40 sends infrared images, visible light images, and temperature measurement data to the wireless communication module 60, and then transmits them to the mobile terminal via the wireless communication module 60. Simultaneously, the main control board 40 also receives control commands from the mobile terminal forwarded by the wireless communication module 60 to achieve image mode switching, pseudo-color mode selection, emissivity setting, and temperature measurement level switching. Referring to the schematic diagram, the wireless communication module circuit includes a wireless communication chip, a power control circuit, and an antenna interface, thereby enabling power-on control of the wireless module while ensuring wireless transmission functionality. By integrating the wireless communication module 60 and the main control board 40 into the same system, the output of dual-light images and temperature measurement data can form a unified data link with remote control, enhancing the device's scalability and remote application capabilities.

[0062] like Figures 2 to 7 As shown, the thermal imager also includes a first housing 11 and a second housing 12, and an infrared imaging module 20, a visible light imaging module 30, a main control board 40 and a touch screen 50 are installed in the accommodating space formed by the first housing 11 and the second housing 12. A cover plate 14 is provided on the second outer shell 12, and a third outer shell 13 is snapped onto the second outer shell 12. The third outer shell 13 is provided with a first light-transmitting hole 131 and a second light-transmitting hole 132. The first light-transmitting hole 131 is positioned corresponding to the infrared imaging module 20 for imaging by the infrared imaging module 20; the second light-transmitting hole 132 is positioned corresponding to the visible light imaging module 30 for imaging by the visible light imaging module 30. In specific implementation, the first outer shell 11 and the second outer shell 12 are fixed by screw connection or snap-fit ​​connection, forming a space for installing internal electronic components.

[0063] In this embodiment, a receiving space is formed by setting a first outer shell 11 and a second outer shell 12 to enclose the space, and a third outer shell 13 is snapped onto the second outer shell 12. Simultaneously, a first light-transmitting hole 131 and a second light-transmitting hole 132 corresponding to the infrared imaging module 20 and the visible light imaging module 30 are respectively provided on the third outer shell 13, enabling the functional modules to achieve a reasonable structural layout and effective protection. Specifically, through the multi-shell combined structure design, not only can good mechanical support and protection be provided for core components such as the infrared imaging module 20, the visible light imaging module 30, and the main control board 40, improving the overall structural strength and impact resistance of the machine, but it also facilitates modular assembly, improving production assembly efficiency and maintenance convenience.

[0064] Meanwhile, by setting light-transmitting holes on the third housing 13 corresponding to the positions of the two imaging modules, the infrared and visible light imaging channels can be ensured to be independent of each other, avoiding structural obstruction or optical path interference, thereby guaranteeing their respective imaging quality. Furthermore, the precise positioning design of the light-transmitting holes helps reduce imaging deviation, providing a good structural foundation for subsequent display coordinate registration. Since the third housing 13 is installed on the second housing 12 using a snap-fit ​​method, it facilitates disassembly, maintenance, or replacement, and achieves a good sealing effect. Combined with the cover plate 14 structure, it effectively prevents dust and moisture from entering the internal storage space, improving the reliability and service life of the equipment in complex environments.

[0065] In a preferred embodiment, an infrared-transmitting material window (such as germanium glass or an infrared-transmitting film) may be provided at the first light-transmitting hole 131 to ensure the transmission of infrared signals while preventing dust from entering; a transparent protective lens may be provided at the second light-transmitting hole 132 to protect the visible light lens.

[0066] like Figure 3 and Figure 4 As shown, the cover plate 14 is provided with a reset hole 141 and a heat dissipation hole 142. The heat dissipation hole 142 is respectively set with the infrared imaging module 20 and the visible light imaging module 30 to provide directional heat dissipation for the infrared imaging module 20 and the visible light imaging module 30. The first outer shell 11 and the second outer shell 12 are together fitted with a protective sleeve 15. The side wall of the protective sleeve 15 is provided with an anti-slip groove 151. The protective sleeve 15 is made of rubber or silicone material. The heat dissipation holes 142 can be distributed in an array or in a strip to balance heat dissipation efficiency and structural strength. At the same time, a dustproof mesh or a waterproof and breathable membrane can be set on the inside of the heat dissipation holes 142 to improve the protection performance while ensuring heat dissipation performance. A reset switch is correspondingly set on the inside of the reset hole 141. The user can trigger the reset by inserting a needle-like object.

[0067] In practical implementation, by correspondingly setting the positions of the heat dissipation hole 142, the infrared imaging module 20, and the visible light imaging module 30, heat can be effectively dissipated along a preset path, improving heat dissipation efficiency and preventing heat accumulation inside the casing. This helps maintain a stable operating temperature of the imaging module, reduces imaging noise or temperature measurement errors caused by temperature rise, and improves the imaging quality and temperature measurement accuracy of the thermal imager. Simultaneously, the reset hole 141 facilitates quick reset operations using external tools in case of equipment malfunction or system crash, improving the ease of maintenance and reliability of the equipment. By covering the first outer shell 11 and the second outer shell 12 with a protective sleeve 15 and providing anti-slip grooves 151 on the side wall of the protective sleeve 15, not only can the entire device be cushioned, protected against drops and impacts, but the friction when held by the user can also be increased to prevent the device from slipping, thereby improving safety and grip comfort.

[0068] like Figures 2 to 7 As shown, a mounting nut 16 for threaded connection with an external bracket is provided between the first outer shell 11 and the second outer shell 12. The mounting nut 16 is provided with a positioning groove 161, and the first outer shell 11 is provided with a positioning block 111 that is positioned and engaged with the positioning groove 161.

[0069] In this embodiment, by providing a mounting nut 16 between the first housing 11 and the second housing 12, the mounting nut 16 is used to connect with the external bracket by thread, so that the thermal imager can be stably installed on a tripod or other fixed support device, thereby meeting the application requirements of long-term detection or high-precision measurement, avoiding the impact of shaking caused by hand operation, and improving measurement stability and imaging quality.

[0070] Meanwhile, by providing a positioning groove 161 on the mounting nut 16 and a positioning block 111 on the first outer shell 11 to cooperate with it, the mounting nut 16 can be reliably limited during assembly, preventing it from rotating or shifting inside the shell. When the mounting nut 16 is threadedly connected to or disassembled from the external bracket, no additional tools are needed to fix the mounting nut 16, improving assembly efficiency and ease of use.

[0071] like Figures 3 to 7 As shown, a memory card slot 17 and a charging port 18 are provided between the first outer shell 11 and the second outer shell 12. The memory card slot 17 is used to insert a TF card, and the charging port 18 is a Type-C interface and is used to charge the thermal imager.

[0072] In practical implementation, a memory card slot 17 for inserting a TF card allows for local storage of infrared images, visible light images, and temperature measurement data. This facilitates subsequent data export, analysis, and retention, enhancing the device's data management capabilities and application flexibility. Furthermore, the use of a removable TF card allows users to easily expand storage capacity or quickly replace storage media as needed, improving ease of use. In addition, the inclusion of a Type-C interface as a charging port 18 not only enables efficient charging of the thermal imager but also offers the advantages of reversible insertion and strong interface compatibility, improving the user experience. Simultaneously, the Type-C interface has a high current carrying capacity, which helps shorten charging time and improve the device's battery life.

[0073] In one embodiment, the main control board 40 is also connected to a power management circuit. This power management circuit converts the battery voltage or external input voltage into multiple operating voltages required by the main control board 40, infrared imaging module 20, visible light imaging module 30, touch screen display 50, and wireless communication module 60. The power management circuit includes a charging management chip, a DC-DC converter circuit, and an LDO voltage regulator circuit, outputting different voltages such as 3.3V, 1.8V, 1.5V, 0.9V, 2.8V, and 1.2V to meet the power supply requirements of the main control chip, display circuit, and image acquisition circuit. By providing voltage divider power to different functional modules, the system power supply stability can be improved, and power fluctuations in the main control board 40 during image acquisition and display can be reduced. This helps reduce image jitter, display misalignment, and acquisition noise, further improving the stability of the dual-light image fusion and display coordinate calibration process.

[0074] In one embodiment, the thermal imager also includes a charging circuit. The charging port 18 is connected to the battery via a charging management chip. The charging management chip controls the charging of the externally input 5V voltage to achieve constant current / constant voltage charging of the battery. The main control board 40 can also obtain the current charging status based on the charging status detection signal and display the charging, fully charged, or abnormal status on the touch screen 50. The charging circuit consists of a Type-C input interface, a charging management chip, and a status detection circuit. After an external power supply is input, it can both charge the battery and supply power to the system. By setting up charging management and status detection circuits in the thermal imager, the continuity of power supply and ease of use of the entire device can be improved, making it suitable for long-term operation in portable handheld scenarios.

[0075] In one embodiment, the main control board 40 is also used to establish corresponding display coordinate offset parameter records for different working modes, lens configurations or field of view modes, and to call the corresponding display coordinate offset parameters when switching working modes, so as to realize automatic alignment display of infrared images and visible light images under different working conditions.

[0076] Specifically, thermal imagers have multiple operating modes for different application scenarios, such as general temperature measurement mode, power line inspection mode, building inspection mode, and industrial process monitoring mode. In different operating modes, the relative positions of the infrared imaging module 20 and the visible light imaging module 30, as well as the lens focal length or field of view, may change due to user lens changes, selection of different field of view settings, or software configurations. For example, when a user switches from wide-angle mode to telephoto mode, the initial offset between the infrared image and the visible light image will change, and the previously stored set of display coordinate offset parameters (Δx, Δy) will no longer be applicable.

[0077] To address this issue, the main control board 40 contains a parameter mapping table stored in non-volatile memory. This table records the association between different operating condition identifiers and their corresponding display coordinate offset parameters. The operating condition identifiers may include one or more combinations of operating mode identifiers (such as mode ID), lens configuration identifiers (such as lens serial number or focal length value), and field of view mode identifiers (such as 1x, 2x, and 4x zoom).

[0078] When a user completes manual coordinate registration of an infrared image and a visible light image for the first time in a certain working mode (e.g., by adjusting and confirming using the directional keys), the main control board 40 obtains the current working condition identifier and associates and stores the current display coordinate offset parameters (Δx, Δy) with this working condition identifier. If registration is performed multiple times under the same working condition, the main control board 40 can prompt the user to overwrite the original parameters or retain the latest adjustment values.

[0079] When the user switches working modes (e.g., selecting different application scenarios via touchscreen 50), changes lenses (automatically detecting the electrical signal of the lens interface via thermal imager or manual confirmation by the user), or changes the field of view mode (e.g., changes in digital zoom magnification), the main control board 40 detects a change in the working condition identifier. At this time, the main control board 40 automatically searches the parameter mapping table for the display coordinate offset parameter corresponding to the current working condition identifier. If a matching record is found, the display coordinate offset parameter is directly called to compensate the starting coordinates of the infrared image display, automatically aligning the infrared image with the visible light image without requiring manual adjustment by the user. If no matching record is found (e.g., the first time using this working condition), the main control board 40 restores the default offset parameters (e.g., Δx=0, Δy=0) and prompts the user to manually register using the directional keys. After registration is complete, a new parameter record is automatically created for this working condition.

[0080] Through the above mechanism, the thermal imager can automatically call the pre-stored display coordinate offset parameters when flexibly switching between various working conditions, ensuring that the infrared image and the visible light image are always aligned. This significantly improves the adaptability of the device in different application scenarios and the user experience, and avoids repeated calibration operations caused by mode switching.

[0081] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A display control method of a thermograph, characterized by, include: Step S1: Obtain the infrared image output by the infrared imaging module and the visible light image output by the visible light imaging module, and place the infrared image and the visible light image in the same display coordinate system to establish the initial display coordinates corresponding to the infrared image; Step S2: In response to the selection command of the fusion display interface, one of the visible light image and the infrared image is displayed as a background image, and the other is displayed as an overlay image on the background image to form a dual-light fusion image; Step S3: Receive the display coordinate adjustment command output by the directional keys, and update the display coordinate offset parameter corresponding to the infrared image according to the display coordinate adjustment command. The display coordinate offset parameter includes a horizontal offset Δx and a vertical offset Δy. Step S4: Update the display start coordinates corresponding to the infrared image according to the updated horizontal offset Δx and vertical offset Δy, and display the infrared image based on the updated display start coordinates, so that the display coordinates of the infrared image relative to the visible light image are compensated along the horizontal and / or vertical axes; at the same time, the adjusted infrared image and the visible light image are synchronously superimposed and updated to generate a dual-light fusion image after display coordinate registration.

2. A thermal imager, characterized in that The thermal imager includes an infrared imaging module, a visible light imaging module, a main control board, and a touch screen; the main control board is used to receive the infrared image output by the infrared imaging module and the visible light image output by the visible light imaging module, and to control the display of the infrared image and the visible light image in the same display coordinate system; the main control board is configured to execute the display control method as described in claim 1.

3. The thermal imager of claim 2, wherein, The main control board is also used to perform semi-transparent display processing on the infrared image when the infrared image and the visible light image are superimposed and displayed, so that the overlapping area of ​​the infrared image and the visible light image can be displayed simultaneously, so that the user can observe the overlapping area of ​​the two and adjust the display coordinates.

4. The thermal imager of claim 2, wherein, The thermal imager also includes directional keys, and the main control board is also used to periodically update the display coordinate offset parameters according to a preset step amount when receiving continuous input from the directional keys, and to continuously update the display start coordinates corresponding to the infrared image based on the updated display coordinate offset parameters.

5. The thermal imager of claim 4, wherein, The directional keys are touch-sensitive directional keys. The main control board updates the display coordinate offset parameters based on the directional signals output by the touch signal input circuit, and updates the display start coordinates corresponding to the infrared image based on the updated display coordinate offset parameters.

6. The thermal imager according to claim 2, characterized in that, The main control board is also used to establish corresponding display coordinate offset parameter records for different working modes, lens configurations or field of view modes, and to call the corresponding display coordinate offset parameters when switching working modes, so as to realize the automatic alignment and display of infrared images and visible light images under different working conditions.

7. The thermal imager according to claim 2, characterized in that, The thermal imager also includes a wireless communication module, which is electrically connected to the main control board. The main control board is also used to establish a wireless connection with the mobile terminal through the wireless communication module, send the infrared image, the visible light image and temperature measurement data to the mobile terminal, and receive control commands sent by the mobile terminal to control the image mode switching, temperature unit setting, pseudo-color mode selection, emissivity adjustment and temperature measurement level switching of the touch screen.

8. The thermal imager according to claim 2, characterized in that, It also includes a first outer shell and a second outer shell, wherein the infrared imaging module, the visible light imaging module, the main control board and the touch screen are installed in the accommodating space formed by the first outer shell and the second outer shell; The second outer shell is provided with a cover plate, and a third outer shell is snapped onto the second outer shell. The third outer shell is provided with a first light-transmitting hole and a second light-transmitting hole. The first light-transmitting hole is positioned corresponding to the position of the infrared imaging module so that the infrared imaging module can perform imaging. The second light-transmitting hole is positioned corresponding to the position of the visible light imaging module so that the visible light imaging module can perform imaging.

9. The thermal imager according to claim 8, characterized in that, The cover plate is provided with a reset hole and a heat dissipation hole. The heat dissipation hole is respectively set with respect to the infrared imaging module and the visible light imaging module to provide directional heat dissipation for the infrared imaging module and the visible light imaging module.

10. The thermal imager according to claim 8, characterized in that, The first outer shell and the second outer shell are both fitted with a protective sleeve, and the side wall of the protective sleeve is provided with anti-slip grooves.

11. The thermal imager according to claim 8, characterized in that, A mounting nut for threaded connection with an external bracket is provided between the first housing and the second housing. The mounting nut has a positioning groove, and the first housing has a positioning block that positions and engages with the positioning groove.

12. The thermal imager according to claim 8, characterized in that, A memory card slot and a charging port are provided between the first outer shell and the second outer shell. The memory card slot is used to insert a TF card, and the charging port is a Type-C interface used to charge the thermal imager.

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