Wide Field of View Infrared Imaging System and Its Control Method

Abstract

An embodiment of the present invention provides a wide-field infrared imaging system and a control method thereof, belonging to the technical field of infrared imaging. The infrared imaging system includes: a scanning unit, including a scanning driving device and at least two reflecting elements having geometric shapes and optical reflection characteristics, the scanning driving device is used to drive the reflecting elements to rotate to achieve a scanning function; an infrared imaging unit, including at least two infrared cameras, used for infrared energy collection and photoelectric conversion to collect image data of the target environment; compared with the traditional scanning method, when the camera frame rate and the scanning field of view angle are fixed, the scanning effective imaging efficiency of the present invention is extremely high, the scanning period corresponding to the scanning period is the smallest, and its index for adapting the maximum speed-height ratio is the largest, which has engineering practical significance.

Description

Technical Field

[0001] The present invention relates to the field of infrared imaging technology, and particularly to a wide-field infrared imaging system and a control method thereof. Background Art

[0002] In the field of airborne applications, infrared imaging technology plays a crucial role in tasks such as target detection and environmental monitoring. However, existing airborne infrared imaging systems face many severe challenges. Traditional systems usually rely on complex pitch-roll mechanisms to achieve scanning imaging, which not only increases the mechanical complexity and weight of the system but also easily causes mechanical failures and accuracy problems.

[0003] In terms of scanning efficiency, most systems are difficult to achieve ideal high-speed scanning and high imaging efficiency. Common scanning methods such as rotary scanning, reciprocating one-way scanning, and reciprocating two-way scanning have varying degrees of limitations in effective imaging efficiency at a 120-degree field of view. For example, the effective imaging efficiency of rotary scanning is as low as 16.7% - 33.3%, reciprocating one-way scanning is generally between 50% - 70%, and although reciprocating two-way scanning has some improvement, it also has problems such as high motor torque requirements and limited scanning speed, and cannot fully meet the urgent need of airborne operations for quickly obtaining large-area high-resolution images. At the same time, under the constraint of the speed-height ratio, the improvement of the detection efficiency of existing systems encounters bottlenecks. As the flight speed of the aircraft increases and the altitude changes, the imaging system is difficult to maintain a stable and efficient working state, seriously affecting the timely detection and accurate identification of ground targets. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a wide-field infrared imaging system and a control method thereof. This infrared imaging system, without the cooperation of a pitch-roll mechanism, can achieve high-speed scanning and wide-field downward imaging requirements with an effective imaging efficiency approaching 100%, breaking through the detection efficiency limitation under its speed-height ratio constraint.

[0005] To achieve the above purpose, the embodiments of the present invention provide a wide-field infrared imaging system, including: a scanning unit, including a scanning driving device and at least two reflecting elements having geometric shapes and optical reflection characteristics, where the scanning driving device is used to drive the reflecting elements to rotate to achieve the scanning function; an infrared imaging unit, including at least two infrared cameras, used for collecting infrared energy and photoelectric conversion, and collecting image data of the target environment; a control module, used to coordinate the work of each unit, generate rotation speed and steering instructions for driving the scanning driving device according to the preset scanning path planning, imaging parameter settings, and environmental monitoring data, and collect and process the image data from the infrared cameras to achieve scanning imaging.

[0006] Optionally, the reflecting element is a triangular prism with an equilateral triangle cross-section and an infrared reflecting mirror on the side.

[0007] Optionally, there is a difference in the cross-sectional angles of the two triangular prisms, and the central axes of the two triangular prisms coincide with each other and are arranged front and back in the direction of the central axis. The central axis is used to show that the optical axes of the two infrared cameras are respectively collinear with the axial center points of the two reflection elements.

[0008] Optionally, the center point of the output shaft of the scanning drive device is collinear with the central axis.

[0009] Optionally, the optical axis directions of the two infrared cameras are opposite to each other and are arranged front and back in the direction of the central axis.

[0010] Optionally, it further includes: a calibration unit, including at least two black bodies, for radiometric calibration of the infrared cameras to improve the radiometric accuracy of the infrared imaging unit.

[0011] Optionally, both of the two black bodies are made of TEC semiconductors to achieve temperature control of heating or cooling; the two black bodies are respectively used as calibration sources for the two infrared cameras.

[0012] On the other hand, the present invention provides a control method for a wide-field infrared imaging system, including: constructing a control logic based on the PID three-loop control algorithm; driving a scanning drive device to drive the rotation of the reflection element according to the control logic to achieve a scanning function; determining the imaging timing of the infrared camera during the scanning process according to the control logic to achieve imaging; regulating the temperature of the black body according to the control logic and performing radiometric calibration on the infrared camera to improve the radiometric accuracy of the infrared imaging unit.

[0013] On the other hand, the present invention provides a control device. The control device includes a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the computer program to implement the wide-field infrared imaging system and its control method as described above.

[0014] On the other hand, the present invention provides a readable storage medium. Instructions are stored on the readable storage medium, and the instructions cause a machine to execute the wide-field infrared imaging system and its control method as described above.

[0015] The advantages of a wide-field infrared imaging system and its control method provided by the present invention are as follows:

[0016] (1) High scanning efficiency and short cycle: Compared with traditional scanning methods, when the camera frame rate and the scanning field of view angle are fixed, the effective imaging efficiency of the scanning of the present invention is extremely high, the corresponding scanning cycle is the smallest, and the index of the maximum speed-to-height ratio it can adapt to is the largest, which has engineering practical significance.

[0017] (2) Low requirements for the motor, no need for rapid speed change: In the present invention, the motor adopts a uniform rotation mode and does not require rapid acceleration or deceleration. Therefore, the torque requirement for the motor is small, and both the volume and weight are small.

[0018] (3) Simple control, no need for cooperation of other mechanisms: The scanning in the present invention is achieved only by a single motor system without the cooperation of other mechanisms, and the overall control is simple.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the system modules of the wide-field infrared imaging system of the present invention;

[0022] Figure 2 It is a front view of the system block diagram of the wide-field infrared imaging system;

[0023] Figure 3 It is a top view of the system block diagram of the wide-field infrared imaging system;

[0024] Figure 4 It is a schematic diagram of 120° field of view scanning using the single-sided mirror rotation scanning method;

[0025] Figure 5 It is a schematic diagram of 120° field of view scanning using the double-sided mirror rotation scanning method;

[0026] Figure 6 It is a schematic diagram of 120° field of view scanning using the whole machine rotation scanning method;

[0027] Figure 7 It is a schematic diagram of 120° field of view scanning using the single-direction reciprocating scanning method;

[0028] Figure 8 It is a schematic diagram of 120° field of view scanning using the double-direction reciprocating scanning method without pitch cooperation;

[0029] Figure 9 It is a schematic diagram of 120° field of view scanning using the double-direction reciprocating scanning method with pitch cooperation;

[0030] Figure 10 It is a schematic diagram of the imaging instantaneous state when the instantaneous value of the scanning angle is 60°;

[0031] Figure 11It is a schematic diagram of the instantaneous imaging state when the instantaneous value of the scanning angle is 90°;

[0032] Figure 12 It is a schematic diagram of the instantaneous imaging state when the instantaneous value of the scanning angle is 120°;

[0033] Figure 13 It is a schematic diagram of the instantaneous imaging state when the instantaneous value of the scanning angle is 150°;

[0034] Figure 14 It is a schematic diagram of the instantaneous imaging state when the instantaneous value of the scanning angle is 180°;

[0035] Figure 15 It is a timing diagram of the operation of the motor, camera, and the change of the imaging area during the 360° rotation of the scanning motor;

[0036] Figure 16 It is a timing diagram of the set temperature of the blackbody module.

[0037] Reference numerals: 1. Left infrared camera; 2. Right infrared camera; 3. Left blackbody; 4. Right blackbody; 5. Scanning motor; 6. Front-end triangular prism; 7. Rear-end triangular prism; 8. Scanning axis. Detailed implementation manners

[0038] The following will detail the specific implementation manners of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustrating and explaining the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0039] It should be noted that the acquisition, transmission, storage, use, processing, etc. of data in the technical solution of this application all comply with the relevant regulations of laws and regulations. In the embodiments of this application, certain industry-existing solutions such as software, components, models, etc. may be mentioned. They should be regarded as exemplary, and their purpose is only to illustrate the feasibility in the implementation of the technical solution of this application, but it does not mean that the applicant has already or necessarily used this solution.

[0040] The following is an explanation of different scanning methods in the prior art:

[0041] On the premise of confirming the field of view angle, overlap rate, spatial angular resolution, and detector array scale, improving the flight operation speed-height ratio can greatly enhance the aerial remote sensing of the area array scanning imaging scheme: the faster the flight speed, the higher the required task efficiency can be obtained, and the lower the flight altitude, the finer ground object images can be obtained. The improvement of the speed-height ratio adaptability is mainly achieved by increasing the two technical indicators of the scanning speed and the effective imaging efficiency during scanning. The scanning speed is mainly determined by the detector frame rate, and the effective imaging efficiency during scanning is determined by the scanning imaging method. Currently, the scanning methods include rotary scanning, reciprocating one-way scanning, and reciprocating two-way scanning. Taking a 120° field of view angle as an example for analysis, the current conventional scanning methods include:

[0042] As Figure 4 shown, Figure 4 is a schematic diagram of 120° field of view scanning using a single-sided mirror rotary scanning method. The imaging scanning angle is 60°, the rotation angle of the scanning cycle is 360°, and the effective imaging efficiency of scanning is 16.7%.

[0043] In rotary scanning, the rotation speed can be very high, but the imaging efficiency is relatively low: the effective imaging efficiency using a single-sided mirror scan is 16.7%.

[0044] As Figure 5 shown, Figure 5 is a schematic diagram of 120° field of view scanning using a double-sided mirror rotary scanning method. The imaging scanning angle is 60°, the rotation angle of the scanning cycle is 180°, and the effective imaging efficiency of scanning is 33.3%, that is, the effective imaging efficiency using a double-sided mirror scan is 33.3%.

[0045] As Figure 6 shown, Figure 6 is a schematic diagram of 120° field of view scanning using a whole machine rotary scanning method. The imaging scanning angle is 120°, the rotation angle of the scanning cycle is 360°, and the effective imaging efficiency of scanning is 33.3%, that is, the effective imaging efficiency using a whole machine rotary scan is 33.3%.

[0046] In this mode, although the imaging efficiency is small, the motor is always in a one-way rotation mode, and the motor rotation speed can be very fast.

[0047] As Figure 7 、 Figure 8 and Figure 9 shown, Figure 7 is a schematic diagram of 120° field of view scanning using a one-way reciprocating scanning method, Figure 8 is a schematic diagram of 120° field of view scanning using a two-way reciprocating scanning method without pitch coordination, Figure 9It is a schematic diagram of 120° field of view scanning using a pitching-assisted bidirectional reciprocating scanning method. It can be seen that in the reciprocating unidirectional scanning, after the camera optical axis scans from the starting position to the edge position of the left field of view and then to the edge position of the right field of view, it needs to quickly return to the edge position of the left field of view for scanning, then quickly change direction and return to the edge position of the left field of view for scanning, and then repeat the above process. Its effective imaging efficiency of scanning is generally controlled at 50%, and the maximum does not exceed 70%. The motor rotates in a reciprocating mode, and the uniform scanning speed of the motor is relatively slow, otherwise there will be extremely high requirements for the torque of the motor.

[0048] In the reciprocating bidirectional scanning, after the camera optical axis scans uniformly from the edge position of the left field of view to the edge position of the right field of view, it needs to quickly change direction and return to the edge position of the right field of view to start the return scan until it scans to the edge position of the left field of view, then quickly change direction and return to the edge position of the left field of view for scanning, and then repeat the above process. In this process, a pitching rotation mechanism is required for cooperation. During each uniform speed stage, the flying image shift is always compensated, and at the roll scanning commutation stage, it returns to the initial position of the flying image shift compensation to avoid the ground scanning area being in a zigzag shape. Its effective imaging efficiency of scanning is generally not less than 80%, and the maximum does not exceed 90%. The motor rotates in a reciprocating mode, and the uniform scanning speed of the motor is relatively slow, otherwise there will be extremely high requirements for the torque of the motor.

[0049] The following is an example description of the present invention:

[0050] Figure 1 It is a module schematic diagram of the wide-field infrared imaging system according to an embodiment of the present invention. As Figure 1 shown, the wide-field infrared imaging system includes: a scanning unit, including a scanning driving device and at least two reflecting elements having a geometric shape and optical reflection characteristics. The scanning driving device is used to drive the reflecting elements to rotate to achieve the scanning function; an infrared imaging unit, including at least two infrared cameras, used for collecting infrared energy and photoelectric conversion, and collecting image data of the target environment; a calibration unit, including at least two black bodies, used for radiometric calibration of the infrared cameras to improve the radiometric accuracy of the infrared imaging unit; a control module, used to coordinate the work of each unit, generate the rotation speed and steering instructions for driving the scanning driving device according to the preset scanning path planning, imaging parameter settings, and environmental monitoring data, and collect and process the image data from the infrared cameras to achieve scanning imaging.

[0051] Preferably, in the embodiment of the present invention, the reflecting element is a triangular prism with an equilateral triangle cross-section and an infrared reflecting mirror on the side.

[0052] Referring to Figure 2 and Figure 3 , Figure 2 is the front view of this wide-field infrared imaging system. Figure 3This is a top view of the wide-field infrared imaging system. For example, the two reflecting elements can be the front triangular prism 6 and the rear triangular prism 7, and the scanning driving device is the scanning motor 5.

[0053] Preferably in the embodiment of the present invention, there is a difference in the cross-sectional angles of the two triangular prisms, and the central axes of the two triangular prisms coincide with each other and are arranged front and back in the direction of the central axis. The central axis is used to show that the optical axes of the two infrared cameras are respectively collinear with the axial center points of the two reflecting elements.

[0054] Preferably in the embodiment of the present invention, the center point of the axis of the output shaft of the scanning driving device is collinear with the central axis.

[0055] For example, the front triangular prism 6 and the rear triangular prism 7 are both triangular prisms with an equilateral triangle cross-section and infrared reflecting mirrors on the sides. The cross-sectional angles of the two triangular prisms differ by 30°. The central axes coincide and are arranged front and back in the scanning axis direction. The optical axes of the left infrared camera 1 and the right infrared camera 2 are respectively collinear with the axial center points of the front triangular prism 6 and the rear triangular prism 7. The central axis serves as the scanning axis 8, and a scanning motor 5 is installed at one end thereof. The scanning module composed of the front triangular prism 6, the rear triangular prism 7, and the scanning motor 5 realizes the functions of rotation control and optical path reflection.

[0056] In the embodiment of the present invention, for example, the cross-sections of the front triangular prism 6 and the rear triangular prism 7 are equilateral triangles with a side length of 250 mm and the side length is 80 mm. The triangular prisms are made of aluminum by processing and are designed for light weight. The sides are polished and coated with a film to ensure that the flatness meets the imaging requirements. The cross-sectional angles of the two triangular prisms differ by 30°. The central axes coincide and are arranged front and back in the scanning axis direction. The optical axes of the left infrared camera 1 and the right infrared camera 2 are respectively collinear with the axial center points of the front triangular prism 6 and the rear triangular prism 7. The central axis serves as the scanning axis 8, and a scanning motor 5 is installed at one end thereof. The scanning motor 5 is equipped with an angle measuring encoder to realize the closed-loop control of the rotation of the scanning motor 5.

[0057] Continue to refer to Figure 2 and Figure 3 , the two infrared cameras can be the left infrared camera 1 and the right infrared camera 2. For example, the left infrared camera 1 and the right infrared camera 2 adopt the same design of the core and lens. Their optical axis directions are opposite and are arranged front and back in the scanning axis direction. The infrared imaging unit composed of the left infrared camera 1 and the right infrared camera 2 realizes the functions of infrared energy collection and photoelectric conversion.

[0058] In the embodiment of the present invention, the optical axis directions of the two infrared cameras are opposite and are arranged front and back in the direction of the central axis.

[0059] In an embodiment of the present invention, for example, the left infrared camera 1 and the right infrared camera 2 select a cooled long-wave infrared detector with a focal plane array size of 320×256 elements. Among them, 320 is in the flight direction, 256 is in the wingspan direction, the pixel size is 30μm, and the imaging spectral band is 8-10μm. A long-wave infrared optical lens with an F number of 2 and a focal length of 100mm is used. In addition, the infrared camera has a digital image motion compensation function, which can compensate for the image motion caused by scanning during the integration time.

[0060] For example, the motor rotation speed can be set to 277.78° / second, and the time for scanning 120° is 0.432 seconds. The imaging overlap rate is set to 10%. For a single row of 120°, 30 single-row images are taken, so the imaging frame period is 14.26 milliseconds. Based on the above settings of the motor and camera parameters, the adaptation speed-height ratio is 0.2 per second. The wide-field infrared imaging system is installed on an airborne general stabilization platform, which can meet the requirements for medium and small aircraft to achieve a coverage inspection with a width of 1039 meters and a ground resolution of 9 cm under the aircraft at a speed of 60 meters per second at an altitude of 300 meters, and realize the search and detection of targets such as personnel, animals, vehicles, houses, ships, etc.

[0061] Preferably, in an embodiment of the present invention, both blackbodies are made of TEC semiconductors to achieve temperature control for heating or cooling; the two blackbodies are used as calibration sources for the two infrared cameras respectively.

[0062] For example, the two blackbodies can be the left blackbody 3 and the right blackbody 4. Among them, the left blackbody 3 is responsible for being the calibration source for the left infrared camera 1, and the right blackbody 4 is responsible for being the calibration source for the right infrared camera 2. Both blackbodies use TEC semiconductors to achieve high-precision temperature control for heating or cooling. The blackbody module composed of the left blackbody 3 and the right blackbody 4 can perform radiation calibration on the camera at regular intervals during the scanning process, thereby ensuring the absolute radiation accuracy of the camera.

[0063] In an embodiment of the present invention, for example, the left blackbody 3 and the right blackbody 4 can be made of copper. The front surface is roughened and coated with black paint, and its emissivity is 0.98. Four TEC semiconductors are installed on the back surface, and four temperature-measuring resistors are also installed to realize the closed-loop temperature control function of the blackbody. After calibration, its measurement accuracy is better than 0.02°C, and the temperature control accuracy is better than 0.1°C.

[0064] Preferably, in an embodiment of the present invention, the left infrared camera 1, the right infrared camera 2, the scanning motor 5, the front prism 6, the rear prism 7, the left blackbody 3 and the right blackbody 4 are installed in the support frame.

[0065] The present invention also provides a control method for a wide-field infrared imaging system, including: constructing a control logic based on the PID three-loop control algorithm; driving a scanning drive device to drive the reflection element to rotate according to the control logic to achieve a scanning function; determining the imaging timing of the infrared camera during the scanning process according to the control logic to achieve imaging; regulating the blackbody temperature according to the control logic and performing radiation calibration on the infrared camera to improve the radiation accuracy of the infrared imaging unit; that is, using the classical PID three-loop control algorithm in the control field to drive the scanning motor 5 to drive the front triangular prism 6 and the rear triangular prism 7 to synchronously rotate and scan, controlling the two infrared cameras to achieve imaging at appropriate scanning positions, and controlling the blackbody temperature to change periodically to achieve multi-point calibration. The following steps can be adopted:

[0066] (1) Convert the wide-field scanning imaging control requirements into a uniform rotation control command, control the scanning motor 5 to rotate uniformly, and the rotation period is 1 / 6 of the line imaging period requirement.

[0067] (2) Generate an imaging pulse sequence according to the rotation angle command in step (1), so that the difference in the corresponding rotation angle commands of adjacent pulses is the single imaging field angle of the infrared camera, and the imaging pulses are sent to the left infrared camera 1 and the right infrared camera 2 to achieve synchronous imaging.

[0068] (3) The blackbody module periodically changes the temperature control value, and the temperature control value takes several equidistant step values, and the value range can cover the temperature range of the ground object target.

[0069] The present invention also provides an application example for the wide-field infrared imaging system:

[0070] Since the triangular prism has periodicity as a three-sided body scanning, when the triangular prism rotates one week, it repeats 3 times as a reflecting surface. Therefore, the imaging scanning range of the dual cameras with a clockwise scanning rotation angle of 120° as a period can be analyzed, and the same is true for the other two periods of 240°.

[0071] When the instantaneous value of the scanning angle is 60°, the instantaneous imaging state is shown in Figure 10 , at this time, the instantaneous imaging area of the left infrared camera 1 is located at the left limit 60° position of the total field of view, and as the front triangular prism 6 rotates clockwise, the instantaneous imaging area moves out of the total field of view to the left, and at this time, the left infrared camera 1 stops periodic imaging; the instantaneous imaging area of the right infrared camera 2 is located at the right limit -60° position of the total field of view, and as the rear triangular prism 7 rotates clockwise, the instantaneous imaging area moves into the total field of view to the left, and at this time, the right infrared camera 2 starts periodic imaging.

[0072] When the instantaneous value of the scanning angle is 90°, the instantaneous imaging state is shown in Figure 11, at this time, the instantaneous imaging area of the left infrared camera 1 is located at the position of the left black body. At this time, the left infrared camera 1 obtains calibration data through single imaging; the instantaneous imaging area of the right infrared camera 2 is located at the center 0° position of the total field of view and moves leftward as the rear triangular prism 7 rotates clockwise. At this time, the right infrared camera 2 is still in the periodic imaging state.

[0073] When the instantaneous value of the scanning angle is 120°, the instantaneous imaging state is shown in Figure 12 , at this time, the instantaneous imaging area of the left infrared camera 1 is located at the right limit -60° position of the total field of view and enters the total field of view leftward as the front triangular prism 6 rotates clockwise. At this time, the left infrared camera 1 starts periodic imaging; the instantaneous imaging area of the right infrared camera 2 is located at the left limit 60° position of the total field of view and moves out of the total field of view leftward as the rear triangular prism 7 rotates clockwise. At this time, the right infrared camera 2 stops periodic imaging.

[0074] When the instantaneous value of the scanning angle is 150°, the instantaneous imaging state is shown in Figure 13 . The instantaneous imaging area of the left infrared camera 1 is located at the center 0° position of the total field of view and moves leftward as the front triangular prism 6 rotates clockwise. At this time, the left infrared camera 1 is still in the periodic imaging state; the instantaneous imaging area of the right infrared camera 2 is located at the position of the right black body. At this time, the right infrared camera 2 obtains calibration data through single imaging;

[0075] When the instantaneous value of the scanning angle is 180°, the instantaneous imaging state is shown in Figure 14 , at this time, the working state and imaging area of the camera scanning and imaging are the same as those at 60°, and the next 120° cycle begins.

[0076] The above is the design diagram of the corresponding camera imaging area and division of labor during the 120° rotation of the scanning motor. It can be seen that during this process, the left infrared camera 1 and the right infrared camera 2 take turns imaging, and the whole process scans and images the ground in real time. The scanning effective imaging efficiency is extremely high and approaches 100%.

[0077] During the 360° rotation of the scanning motor, the working sequence of the scanning motor 5, the infrared camera, and the change sequence of the imaging area are as shown in Figure 15 . Among them, T 扫描 is the time taken for the scanning motor 5 to rotate 360°.

[0078] The black body changes the temperature control value with a period of T. The temperature control value takes several step values, and the value range needs to cover the temperature range of the ground object. The working sequence of the set temperature of the black body is as shown in Figure 16 . Among them, T 黑体 is the duration of the black body module at a single temperature, and m is the number of step values of the temperature setting of the black body.

[0079] The advantages of the present invention are as follows:

[0080] (1) High scanning efficiency and short cycle: Compared with the traditional scanning method, when the camera frame rate and the scanning field of view angle are fixed, the effective imaging efficiency of the scanning of the present invention is extremely high, the corresponding scanning cycle is the smallest, and the index of the maximum speed-height ratio it can adapt to is the largest, which has engineering practical significance.

[0081] (2) Low requirements for the motor and no need for rapid speed change: In the present invention, the motor rotates at a constant speed and does not require rapid acceleration and deceleration. Therefore, the torque requirement for the motor is small, and both the volume and weight are small.

[0082] (3) Simple control and no need for cooperation of other mechanisms: The scanning in the present invention is realized only by one motor system and does not require the cooperation of other mechanisms, and the overall control is simple.

[0083] The present invention provides a control device, which includes: a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the computer program to implement the control method of the wide-field infrared imaging system as described above.

[0084] An embodiment of the present invention provides a readable storage medium, on which instructions are stored, and these instructions cause a machine to execute the control method of the wide-field infrared imaging system as described above.

[0085] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0086] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0087] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction means that implements the function specified in one or more of the procedures Figure 1 or more procedures and / or blocks Figure 1 or more blocks specified in the block.

[0088] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable apparatus provide steps for implementing the function specified in one or more of the procedures Figure 1 or more procedures and / or blocks Figure 1 or more blocks specified in the block.

[0089] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0090] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer-readable media.

[0091] Computer-readable media includes permanent and non-permanent, removable and non-removable media and can be implemented by any method or technology for storing information. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0092] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0093] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the present application.

Claims

1. A wide-field infrared imaging system, characterized in that: include: The scanning unit comprises a scanning drive device and at least two reflective elements having a geometric shape and optical reflective characteristics, wherein the reflective element is a triangular prism with an equilateral triangle cross section and an infrared reflector on the side, and the scanning drive device is used to drive the reflective element to rotate to realize a scanning function; An infrared imaging unit, comprising at least two infrared cameras, for collecting infrared energy and photoelectric conversion, and acquiring image data of a target environment, wherein the cross-sectional angles of the two triangular prisms differ, and the central axes of the two triangular prisms coincide with each other and are arranged front to back in the direction of the central axis, and the central axis is used to indicate that the optical axes of the two infrared cameras are collinear with the axial center points of the two reflective elements, respectively, and the optical axes of the two infrared cameras are in opposite directions and are arranged front to back in the direction of the central axis, and the axis center point of the output axis of the scanning drive device is collinear with the central axis; The control module is used to coordinate the work of the scanning unit and the infrared imaging unit, generate the speed and steering instructions for driving the scanning drive device according to the preset scanning path planning, imaging parameter settings and environmental monitoring data, and collect and process the image data from the infrared camera to achieve scanning imaging.

2. The wide-field infrared imaging system according to claim 1, characterized in that: Also includes: The calibration unit includes at least two black bodies and is used to perform radiation calibration on the infrared camera to improve the radiation accuracy of the infrared imaging unit.

3. The wide-field infrared imaging system according to claim 2, characterized in that: Both black bodies are made of TEC semiconductors to achieve temperature control for heating or cooling; The two black bodies serve as calibration sources for the two infrared cameras respectively.

4. A control method for a wide-field infrared imaging system according to any one of claims 1 to 3, characterized in that: include: Build control logic based on PID three-loop control algorithm; Driving the scanning driving device to drive the reflecting element to rotate according to the control logic to achieve a scanning function; Determining the imaging timing of the infrared camera in the scanning process according to the control logic to achieve imaging; The black body temperature is regulated according to the control logic, and the infrared camera is calibrated for radiation, so as to improve the radiation accuracy of the infrared imaging unit.

5. A control device, characterized in that: The control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the control method of the wide-field-of-view infrared imaging system according to claim 4.

6. A readable storage medium, characterized in that: The readable storage medium stores instructions, which enable the machine to execute the control method of the wide-field infrared imaging system according to claim 4.

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