Wide-field-of-view infrared imaging system and control method thereof

Abstract

The embodiment of the invention provides a wide-view-field infrared imaging system and a control method thereof, and belongs to the technical field of infrared imaging. The infrared imaging system comprises a scanning unit which comprises a scanning driving device and at least two reflection elements with geometrical shapes and optical reflection characteristics, and the scanning driving device is used for driving the reflection elements to rotate so as to realize a scanning function; the infrared imaging unit comprises at least two infrared cameras and is used for collecting infrared energy, performing photoelectric conversion and collecting image data of a target environment; compared with a traditional scanning mode, on the premise that the camera frame frequency and the scanning field angle are fixed, the effective scanning imaging efficiency is extremely high, the scanning period corresponding to the scanning period is minimum, the index adapting to the maximum speed-height ratio is maximum, and the method has engineering practical significance.

Description

Technical Field

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

[0002] In the field of aviation, infrared imaging technology plays a key role in target detection, environmental monitoring and other tasks. However, existing aviation infrared imaging systems face many severe challenges. Traditional systems usually rely on complex pitch and rotation 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 find it difficult to achieve ideal high-speed scanning and high imaging efficiency. Common scanning methods such as rotation scanning, reciprocating unidirectional scanning and reciprocating bidirectional scanning have different degrees of limitations in their effective imaging efficiency at a 120-degree field of view. For example, the effective imaging efficiency of rotation scanning is as low as 16.7%-33.3%, and the reciprocating unidirectional scanning is generally 50%-70%. Although the reciprocating bidirectional scanning has been improved, it also has problems such as high motor torque requirements and limited scanning speed, which cannot fully meet the urgent needs of aviation operations for rapid acquisition of large-area high-resolution images. At the same time, under the constraints of the speed-to-height ratio, the detection efficiency improvement of the existing system has encountered bottlenecks. With the increase in aircraft flight speed and changes in altitude, it is difficult for the imaging system to maintain a stable and efficient working state, which seriously affects the timely detection and accurate identification of ground targets. Summary of the invention

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

[0005] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a wide-field-of-view infrared imaging system, comprising: a scanning unit, comprising a scanning drive device and at least two reflective elements having a geometric shape and optical reflective characteristics, wherein the scanning drive device is used to drive the reflective elements to rotate to achieve a scanning function; an infrared imaging unit, comprising at least two infrared cameras, which are used for infrared energy collection and photoelectric conversion, and to collect image data of a target environment; a control module, which is used to coordinate the work of each unit, generate a rotation speed and a steering command for driving the scanning drive device according to a 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.

[0006] Optionally, the reflective element is a triangular prism with an equilateral triangle cross section and an infrared reflector 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 to 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 reflective elements.

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

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

[0010] Optionally, it also includes: a calibration unit, including at least two black bodies, for performing radiation calibration on the infrared camera to improve the radiation accuracy of the infrared imaging unit.

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

[0012] On the other hand, the present invention provides a control method for a wide-field-of-view infrared imaging system, comprising: constructing a control logic based on a PID three-loop control algorithm; driving a scanning drive device to rotate the reflective element 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; and regulating the black body temperature according to the control logic and performing radiation calibration on the infrared camera to improve the radiation accuracy of the infrared imaging unit.

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

[0014] On the other hand, the present invention provides a readable storage medium having instructions stored thereon, wherein the instructions enable a machine to execute the wide-field-of-view infrared imaging system and the control method thereof as described above.

[0015] The wide-field infrared imaging system and control method thereof provided by the present invention have the advantages of: (1) High scanning efficiency and short cycle: Compared with the traditional scanning method, when the camera frame rate and scanning field angle are fixed, the scanning effective imaging efficiency of the present invention is extremely high, the scanning cycle corresponding to the scanning cycle is the smallest, and its adaptability to the maximum speed-to-height ratio is the largest, which has practical engineering significance.

[0016] (2) Low motor requirements and no need for rapid speed change: The motor in the present invention adopts a uniform rotation mode and does not require rapid acceleration and deceleration. Therefore, the motor torque requirement is small and the volume and weight are small.

[0017] (3) Simple control, no need for other mechanisms to cooperate: The scanning in the present invention is achieved by only one motor system, without the need for other mechanisms to cooperate, and the overall control is simple.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying 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 implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 Schematic diagram of system modules of the wide-field infrared imaging system of the present invention; Figure 2 It is the front view of the system block diagram of the wide field of view infrared imaging system; Figure 3 It is a top view of the system block diagram of the wide field of view infrared imaging system; Figure 4 It is a schematic diagram of 120° field of view scanning using a single-sided mirror rotation scanning method; Figure 5 It is a schematic diagram of 120° field of view scanning using a double-sided mirror rotation scanning method; Figure 6 This is a schematic diagram of 120° field of view scanning using the whole machine rotation scanning method; Figure 7 It is a schematic diagram of 120° field of view scanning using a one-way reciprocating scanning method; Figure 8 It is a schematic diagram of 120° field of view scanning using a bidirectional reciprocating scanning method without pitch coordination; Fig. 9 It is a schematic diagram of 120° field of view scanning using a two-way reciprocating scanning method with pitch coordination; Fig.10 Schematic diagram of the instantaneous state of imaging when the instantaneous value of the scanning angle is 60°; Fig.11 Schematic diagram of the instantaneous state of imaging when the instantaneous value of the scanning angle is 90°; Fig.12 Schematic diagram of the instantaneous state of imaging when the instantaneous value of the scanning angle is 120°; Fig.13 Schematic diagram of the instantaneous state of imaging when the instantaneous value of the scanning angle is 150°; Fig.14Schematic diagram of the instantaneous state of imaging when the instantaneous value of the scanning angle is 180°; Fig.15 It is the timing diagram of the motor, camera working timing and imaging area change during the scanning motor rotating 360°; Fig.16 It is the timing diagram of setting the temperature of the blackbody module.

[0020] Figure numerals: 1. left infrared camera; 2. right infrared camera; 3. left black body; 4. right black body; 5. scanning motor; 6. front triangular prism; 7. rear triangular prism; 8. scanning axis. DETAILED DESCRIPTION

[0021] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0022] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of laws and regulations. In the embodiments of this application, some existing solutions in the industry such as certain software, components, and models may be mentioned, which should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use the solution.

[0023] The following is a description of different scanning methods in the prior art: Under the premise of confirming the field of view angle, overlap rate, spatial angular resolution and detector array size, improving the flight operation speed-to-height ratio will greatly improve the aerial remote sensing of the array scanning imaging solution: the faster the flight speed, the higher the required mission efficiency can be obtained, and the lower the flight altitude, the more detailed the ground image can be obtained. The improvement of the adaptability of the speed-to-height ratio is mainly achieved by improving the two technical indicators of scanning speed and 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. The current scanning methods include rotation scanning, reciprocating unidirectional scanning and reciprocating bidirectional scanning. Taking the 120-degree field of view angle as an example, the current conventional scanning methods include: like Figure 4 As shown, Figure 4 It is a schematic diagram of 120° field of view scanning using a single-sided mirror rotation scanning method. The imaging scanning angle is 60°, the scanning cycle rotation angle is 360°, and the scanning effective imaging efficiency is 16.7%.

[0024] In rotational scanning, the rotation speed can be very high, but the imaging efficiency is low: the effective imaging efficiency using a single-sided mirror is 16.7%.

[0025] like Figure 5 As shown, Figure 5 It is a schematic diagram of 120° field of view scanning using a double-sided mirror rotation scanning method. The imaging scanning angle is 60°, the scanning cycle rotation angle is 180°, and the effective imaging efficiency of the scanning is 33.3%, that is, the effective imaging efficiency of the double-sided mirror scanning is 33.3%.

[0026] like Figure 6 As shown, Figure 6 It is a schematic diagram of 120° field of view scanning using the whole machine rotation scanning method. The imaging scanning angle is 120°, the scanning cycle rotation angle is 360°, and the effective imaging efficiency of the scanning is 33.3%, that is, the effective imaging efficiency of the whole machine rotation scanning is 33.3%.

[0027] Although the imaging efficiency is lower in this mode, the motor is always in unidirectional rotation mode and the motor rotation speed can be very fast.

[0028] like Figure 7 , Figure 8 and Fig. 9 As shown, Figure 7 This is a schematic diagram of 120° field of view scanning using a one-way reciprocating scanning method. Figure 8 This is a schematic diagram of 120° field of view scanning using a bidirectional reciprocating scanning method without pitch coordination. Fig. 9 This is a schematic diagram of a 120° field of view scanning method using a two-way reciprocating scanning method with pitch coordination. It can be seen that in the reciprocating unidirectional scanning, the camera optical axis scans from the left field of view edge position at the starting position to the right field of view edge position and then needs to quickly return to the left field of view edge position for scanning, then quickly change direction and return to the left field of view edge position for scanning, and then repeat the above process. The effective imaging efficiency of the scanning is generally controlled at 50%, and the maximum does not exceed 70%. The motor rotates in a reciprocating mode, and the motor uniform scanning speed is slow, otherwise it will have extremely high requirements for the torque of the motor.

[0029] In the reciprocating bidirectional scanning, after the camera optical axis scans uniformly from the edge of the left field of view to the edge of the right field of view, it needs to quickly change direction and return to the edge of the right field of view to start scanning back until it scans to the edge of the left field of view, then quickly change direction and return to the edge of the left field of view to scan, and then repeat the above process. In this process, a pitch rotation mechanism is required to cooperate, and the flight image motion is always compensated in each uniform speed stage, and the flight image motion compensation is returned to the initial position in the rolling scanning reversing stage to avoid the ground scanning area being zigzag. Its scanning effective imaging efficiency is generally not less than 80%, and the maximum does not exceed 90%. The motor rotates in a reciprocating mode, and the uniform speed scanning speed of the motor is slow, otherwise there are extremely high requirements for the torque of the motor.

[0030] The following is an example of the present invention: Figure 1Schematic diagram of a wide-field infrared imaging system according to an embodiment of the present invention. Figure 1 As shown, the wide-field infrared imaging system includes: a scanning unit, including a scanning drive device and at least two reflective elements with geometric shapes and optical reflective characteristics, the scanning drive device is used to drive the reflective 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, and collecting image data of the target environment; a calibration unit, including at least two black bodies, used to perform radiation calibration on the infrared camera to improve the radiation accuracy of the infrared imaging unit; a control module, used to coordinate the work of each unit, generate a rotation speed and steering command for driving the scanning drive device according to a preset scanning path planning, imaging parameter settings and environmental monitoring data, collect and process image data from the infrared camera, so as to achieve scanning imaging.

[0031] In a preferred embodiment of the present invention, the reflective element is a triangular prism with an equilateral triangle cross section and an infrared reflector on the side.

[0032] Reference Figure 2 and Figure 3 , Figure 2 This is the front view of the wide field of view infrared imaging system. Figure 3 This is a top view of the wide-field infrared imaging system. As an example, the two reflective elements may be a front triangular prism 6 and a rear triangular prism 7 , and the scanning drive device may be a scanning motor 5 .

[0033] In a preferred 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 to 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 reflective elements.

[0034] In a preferred embodiment of the present invention, the axis center point of the output axis of the scanning drive device is colinear with the central axis.

[0035] For example, the front triangular prism 6 and the rear triangular prism 7 are both triangular prisms with equilateral triangle cross sections and infrared reflectors on the sides. The two triangular prisms differ in cross-sectional angle by 30°, and their central axes overlap 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 collinear with the axial center points of the front triangular prism 6 and the rear triangular prism 7, respectively. 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 rotation control and light path reflection.

[0036] In the embodiment of the present invention, for example, the cross-section of the front triangular prism 6 and the rear triangular prism 7 is an equilateral triangle with a side length of 250 mm and a side length of 80 mm. The triangular prism is made of aluminum and is designed to be lightweight, and the side is polished and coated to ensure that the flatness meets the imaging requirements. The two triangular prisms differ in cross-sectional angle by 30°, and 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 collinear with the axial center points of the front triangular prism 6 and the rear triangular prism 7, respectively. 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 angular encoder to realize closed-loop control of the rotation of the scanning motor 5.

[0037] Continue to refer to Figure 2 and Figure 3 The two infrared cameras may be a left infrared camera 1 and a right infrared camera 2. For example, the left infrared camera 1 and the right infrared camera 2 use the same movement and lens design. Their optical axes are opposite and 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 infrared energy collection and photoelectric conversion.

[0038] In the embodiment of the present invention, the optical axes of the two infrared cameras are opposite to each other and are arranged front to back in the direction of the central axis.

[0039] In the embodiment of the present invention, for example, the left infrared camera 1 and the right infrared camera 2 select a refrigerated long-wave infrared detector, the array size is 320×256 pixels, where 320 is the flight direction, 256 is the wingspan direction, the pixel size is 30 μm, and the imaging spectrum is 8-10 μm. A long-wave infrared optical lens with an F number of 2 and a focal length of 100 mm 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.

[0040] For example, the motor rotation rate 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%, and a single line of 120° corresponds to 30 single-line images, so the imaging frame period is 14.26 milliseconds. Based on the above settings of the motor and camera parameters, the adaptive speed-to-height ratio is 0.2 seconds. The wide-field infrared imaging system is installed on an airborne general-purpose stable platform, which can meet the needs of small and medium-sized aircraft to achieve a coverage patrol of 1039 meters wide and 9 cm ground resolution under the aircraft at a speed of 60 meters / second at an altitude of 300 meters, and realize the search and detection of targets such as personnel, animals, vehicles, houses, and ships.

[0041] In the preferred embodiment of the present invention, both black bodies are made of TEC semiconductor to achieve temperature control of heating or cooling; the two black bodies serve as calibration sources for two infrared cameras respectively.

[0042] For example, the two black bodies can be left black body 3 and right black body 4. The left black body 3 is responsible for the calibration source for the left infrared camera 1, and the right black body 4 is responsible for the calibration source for the right infrared camera 2. Both black bodies use TEC semiconductors to achieve high-precision temperature control for heating or cooling. The black body module composed of the left black body 3 and the right black body 4 can perform radiation calibration on the camera at regular intervals during the scanning process, thereby ensuring the absolute radiation accuracy of the camera.

[0043] In the embodiment of the present invention, for example, the left black body 3 and the right black body 4 can be made of copper, the front side is roughened and plated with black paint, and the emissivity is 0.98. Four TEC semiconductors are installed on the back side, and four temperature measuring resistors are installed at the same time to realize the closed-loop temperature control function of the black body. After calibration, the measurement accuracy is better than 0.02°C, and the temperature control accuracy is better than 0.1°C.

[0044] In the preferred embodiment of the present invention, the left infrared camera 1, the right infrared camera 2, the scanning motor 5, the front triangular prism 6, the rear triangular prism 7, the left black body 3 and the right black body 4 are installed in the supporting frame.

[0045] The present invention also provides a control method for a wide-field infrared imaging system, comprising: constructing a control logic based on a PID three-loop control algorithm; driving a scanning drive device to drive the reflective element to rotate according to the control logic to realize a scanning function; determining the imaging timing of the infrared camera in the scanning process according to the control logic to realize imaging; regulating the black body 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 classic PID three-loop control algorithm in the control field, driving the scanning motor 5 to drive the front triangular prism 6 and the rear triangular prism 7 to synchronously realize rotation scanning, controlling the two infrared cameras to realize imaging at a suitable scanning position, and controlling the black body temperature to change periodically to realize multi-point calibration, and the following steps can be adopted: (1) The wide field scanning imaging control requirements are converted into uniform rotation control commands to control the scanning motor 5 to rotate at a uniform speed, and the rotation period is 1 / 6 of the required line imaging period.

[0046] (2) In step (1), an imaging pulse sequence is generated according to the rotation angle command, so that the corresponding rotation angle command difference of adjacent pulses is the single imaging field of view of the infrared camera, and the imaging pulse is sent to the left infrared camera 1 and the right infrared camera 2 to achieve synchronous imaging.

[0047] (3) The blackbody module periodically changes the temperature control value. The temperature control value takes a number of arithmetic step values, and the value range can cover the temperature range of the ground object.

[0048] The present invention also provides an application example for a wide-field infrared imaging system: Since the triangular prism has periodicity when scanned as a trihedron, it rotates once and acts as a reflection surface three times. Therefore, the imaging scanning range of the dual camera with a clockwise scanning rotation angle of 120° as one cycle can be analyzed. The same is true for the other two cycles totaling 240°.

[0049] When the instantaneous value of the scanning angle is 60°, the instantaneous state of imaging is shown in Fig.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 to the left out of the total field of view, and 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 to the left into the total field of view, and the right infrared camera 2 starts periodic imaging.

[0050] When the instantaneous value of the scanning angle is 90°, the instantaneous state of imaging is shown in Fig.11 At this time, the instantaneous imaging area of ​​the left infrared camera 1 is located at the left black body position, and the left infrared camera 1 obtains calibration data through a 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 to the left with the clockwise rotation of the rear end triangular prism 7. At this time, the right infrared camera 2 is still in a periodic imaging state.

[0051] When the instantaneous value of the scanning angle is 120°, the instantaneous state of imaging is shown in Fig.12 At this time, the instantaneous imaging area of ​​the left infrared camera 1 is located at the right limit of the total field of view, -60°, and as the front triangular prism 6 rotates clockwise, the instantaneous imaging area enters the total field of view to the left, and the left infrared camera 1 starts periodic imaging; the instantaneous imaging area of ​​the right infrared camera 2 is located at the left limit of the total field of view, 60°, and as the rear triangular prism 7 rotates clockwise, the instantaneous imaging area moves to the left out of the total field of view, and the right infrared camera 2 stops periodic imaging.

[0052] When the instantaneous value of the scanning angle is 150°, the instantaneous state of imaging is shown in Fig.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 to the left as the front triangular prism 6 rotates clockwise. At this time, the left infrared camera 1 is still in a periodic imaging state; the instantaneous imaging area of ​​the right infrared camera 2 is located at the right black body position. At this time, the right infrared camera 2 acquires calibration data by single imaging; When the instantaneous value of the scanning angle is 180°, the instantaneous state of the imaging is shown in Fig.14 At this time, the camera scanning imaging working state and imaging area are consistent with 60°, and begin to enter the next 120° cycle.

[0053] 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 to image, and the whole process scans the ground all the time, and the scanning effective imaging efficiency is extremely high and close to 100%.

[0054] During the 360° rotation of the scanning motor, the working sequence of the scanning motor 5 and the infrared camera and the changing sequence of the imaging area are as follows: Fig.15 As shown. Where T 扫描 It is the time taken by the scanning motor 5 to rotate 360°.

[0055] The blackbody 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 target. The working sequence of the blackbody setting temperature is as follows Fig.16 As shown. Where T 黑体 The duration of the blackbody module at a single temperature, m sets the number of step values ​​for the temperature of the blackbody.

[0056] The advantages of the present invention are: (1) High scanning efficiency and short cycle: Compared with the traditional scanning method, when the camera frame rate and scanning field angle are fixed, the scanning effective imaging efficiency of the present invention is extremely high, the scanning cycle corresponding to the scanning cycle is the smallest, and its adaptability to the maximum speed-to-height ratio is the largest, which has practical engineering significance.

[0057] (2) Low motor requirements and no need for rapid speed change: The motor in the present invention adopts a uniform rotation mode and does not require rapid acceleration and deceleration. Therefore, the motor torque requirement is small and the volume and weight are small.

[0058] (3) Simple control, no need for other mechanisms to cooperate: The scanning in the present invention is achieved by only one motor system, without the need for other mechanisms to cooperate, and the overall control is simple.

[0059] The present invention provides a control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the computer program to implement the control method of the wide-field-of-view infrared imaging system as described above.

[0060] An embodiment of the present invention provides a readable storage medium, on which instructions are stored, and the instructions enable a machine to execute the control method of the wide-field-of-view infrared imaging system as described above.

[0061] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt 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 codes.

[0062] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0063] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0065] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0066] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0067] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. 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 technology, compact disk read-only memory (CD-ROM), digital versatile disk (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 temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0068] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0069] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A wide-field infrared imaging system, characterized in that: include: A scanning unit, comprising a scanning drive device and at least two reflective elements having a geometric shape and optical reflective characteristics, wherein the scanning drive device is used to drive the reflective elements to rotate to achieve a scanning function; An infrared imaging unit, including at least two infrared cameras, for collecting infrared energy and photoelectric conversion, and acquiring image data of the target environment; 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: The reflective element is a triangular prism with an equilateral triangle cross section and an infrared reflector on the side.

3. The wide-field infrared imaging system according to claim 2, characterized in that: 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 to back in the central axis direction. The central axis is used to show that the optical axes of the two infrared cameras are collinear with the axial center points of the two reflective elements.

4. The wide-field infrared imaging system according to claim 3, characterized in that: The axis center point of the output shaft of the scanning driving device is collinear with the central axis.

5. The wide-field infrared imaging system according to claim 3, characterized in that: The optical axes of the two infrared cameras are opposite to each other and are arranged front to back in the direction of the central axis.

6. 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.

7. The wide-field infrared imaging system according to claim 6, 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.

8. A control method for a wide-field infrared imaging system according to any one of claims 1 to 7, 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.

9. A control device, characterized in that: The control device comprises: 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 8.

10. 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-of-view infrared imaging system according to claim 8.

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