An imaging system, an imaging control method, and a controller

Abstract

The application discloses an imaging system, an imaging control method and a controller. The imaging system comprises a controller, a camera lens and at least two PIR sensors, and the monitoring distances of the at least two PIR sensors are different. The invasion of a monitoring object is sensed through the at least two PIR sensors with different monitoring distances, and monitoring start indication information is sent to the controller; the controller is used for receiving the monitoring start indication information, controlling the camera lens to start, and controlling the camera lens to track the monitoring object through relay zooming according to the sequence of the at least two PIR sensors sending the monitoring start indication information. Relay sensing of the monitoring object is realized through the at least two PIR sensors with different monitoring distances, the camera lens tracks the monitoring object through relay zooming, relay monitoring is realized, and therefore the monitoring effect is improved.

Description

Technical Field

[0001] This application relates to the field of security camera technology, and in particular to an imaging system, imaging control method and controller. Background Technology

[0002] Currently, low-power camera lens wake-up in the industry typically uses infrared human body PIR sensors and radar modules for triggering. However, conventional PIR sensors have drawbacks. Once the lens parameters of a conventional PIR sensor are fixed, it can only recognize and wake up a human body at a specific location. Often, the camera lens is not woken up after the monitored object has intruded, or the monitored object is not within the monitoring range after the camera lens is woken up, resulting in poor monitoring performance. Summary of the Invention

[0003] This application provides an imaging system, imaging control method, and controller to address the problem of poor monitoring performance in existing technologies.

[0004] This application provides an imaging system, which includes: a controller, a camera lens, and at least two infrared human body PIR sensors; the at least two PIR sensors have different monitoring distances;

[0005] The at least two PIR sensors are used to send monitoring start instruction information to the controller when they sense the radiation band of the monitored object.

[0006] The controller is configured to receive the monitoring start indication information sent by the at least two PIR sensors, and control the camera lens to track the monitored object by relay zoom according to the order in which the at least two PIR sensors send the monitoring start indication information.

[0007] Furthermore, the controller is used to store the correspondence between the at least two PIR sensors and the focal length respectively;

[0008] The at least two PIR sensors are used to send the monitoring start instruction information to the controller when they sense the radiation band of the monitored object, and carry their own identification information in the monitoring start instruction information;

[0009] The controller is configured to receive the monitoring start instruction information and obtain the identification information of the target PIR sensor carried therein, determine the target focal length corresponding to the target PIR sensor based on the identification information of the target PIR sensor, control the camera lens to adjust the focal length to the target focal length for focusing, and track the monitored object.

[0010] Furthermore, the controller is configured to, when receiving a monitoring start instruction message sent by the PIR sensor with the furthest monitoring distance, control the focal length of the camera lens to be adjusted to the focal length corresponding to the PIR sensor with the furthest monitoring distance for focusing, and capture an image of the monitored object.

[0011] Furthermore, the controller is configured to, when receiving monitoring start indication information sent by two or more PIR sensors, control the camera lens to adjust its focus to capture an image of the monitored object and record video of the monitored area according to the order in which the monitoring start indication information was sent.

[0012] Furthermore, the partitioned structure of the at least two PIR sensors is designed using metasurface materials according to at least two focal lengths of the camera lens; the monitoring distance of the at least two PIR sensors is not less than the shooting distance when the corresponding focal length of the camera lens is focused.

[0013] Furthermore, each of the at least two PIR sensors includes a sector-shaped partition structure, which includes a sector-shaped bright area structure and a sector-shaped dark area structure arranged at intervals; when at least one sector-shaped bright area structure and at least one sector-shaped dark area structure both sense the radiation band of the monitored object, a monitoring start instruction message is sent to the controller.

[0014] Among them, the longer the monitoring distance of a PIR sensor, the fewer the fan-shaped bright area structure and fan-shaped dark area structure it contains.

[0015] Furthermore, the imaging system also includes: an alarm;

[0016] The controller is also configured to send alarm indication information to the alarm device when it receives the monitoring start indication information;

[0017] The alarm device is used to output alarm information indicating that the monitored object has entered the monitoring range when it receives the alarm indication information.

[0018] Furthermore, the imaging system also includes: a terminal device;

[0019] The controller is also configured to send a prompt message to the terminal device, indicating that the monitored object has entered the monitoring range, when it receives the monitoring start instruction information.

[0020] Furthermore, the controller is also configured to control the camera lens to enter a sleep state when it stops receiving monitoring start indication information sent by the PIR sensor.

[0021] On the other hand, this application provides an imaging control method, the method comprising:

[0022] The controller receives monitoring start indication information sent by at least two PIR sensors, wherein the monitoring start indication information is sent to the controller by the at least two PIR sensors when they sense the radiation band of the monitored object;

[0023] Based on the order in which the monitoring start instruction information is sent by the at least two PIR sensors, the camera lens is controlled to track the monitored object through relay zoom.

[0024] In another aspect, this application provides a controller, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0025] Memory, used to store computer programs;

[0026] A processor, when executing a program stored in memory, implements the steps of the method described.

[0027] This application provides an imaging system, an imaging control method, and a controller. The imaging system includes: a controller, a camera lens, and at least two infrared human body PIR sensors; the at least two PIR sensors have different monitoring distances; the at least two PIR sensors are used to send monitoring start indication information to the controller when they sense the radiation band of the monitored object; the controller is used to receive the monitoring start indication information sent by the at least two PIR sensors, and control the camera lens to track the monitored object by relay zoom according to the order in which the at least two PIR sensors send the monitoring start indication information.

[0028] The above technical solution has the following advantages or beneficial effects:

[0029] In this application, the imaging system includes a controller, a camera lens, and at least two PIR sensors with different monitoring distances. The system uses these two PIR sensors with different monitoring distances to sense intrusion into a monitored object and sends a monitoring activation instruction to the controller. The controller receives the monitoring activation instruction, activates the camera lens, and, according to the order in which the monitoring activation instructions are sent by the two PIR sensors, controls the camera lens to track the monitored object through relay zoom. By using at least two PIR sensors with different monitoring distances to achieve relay sensing of the monitored object and controlling the camera lens to track the monitored object through relay zoom, relay monitoring is achieved. Furthermore, relay zoom can improve the image clarity of the monitored object, thereby enhancing the monitoring effect. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the first imaging system structure provided in this application;

[0032] Figure 2 This is a schematic diagram of the second imaging system structure provided in this application;

[0033] Figure 3 This is a schematic diagram of the third imaging system structure provided in this application;

[0034] Figure 4 This is a schematic diagram of the imaging control process provided in this application;

[0035] Figure 5 The working principle diagram of the low-power camera provided in this application;

[0036] Figure 6 A schematic diagram of the partition structure of the first PIR sensor (region 1) provided in this application;

[0037] Figure 7 A schematic diagram of the partition structure of the second PIR sensor (region 2) provided in this application;

[0038] Figure 8 A schematic diagram of the partition structure of the third PIR sensor (3 zones) provided in this application;

[0039] Figure 9 A schematic diagram of the partition structure of the fourth PIR sensor (4 zones) provided in this application;

[0040] Figure 10 A general partitioning structure diagram of the four PIR sensors provided in this application;

[0041] Figure 11 The imaging control flowchart provided in this application;

[0042] Figure 12 This is a schematic diagram of the controller structure provided in this application. Detailed Implementation

[0043] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0044] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0045] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0046] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0047] The term "module" refers to any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0049] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

[0050] Figure 1 The schematic diagram of the imaging system provided in this application includes a controller 11, a camera lens 12, and at least two infrared human body PIR sensors 13; the at least two PIR sensors 13 have different monitoring distances;

[0051] The at least two PIR sensors 13 are used to send monitoring start instruction information to the controller 11 when they sense the radiation band of the monitored object;

[0052] The controller 11 is used to receive the monitoring start instruction information sent by the at least two PIR sensors 13, and control the camera lens 12 to track the monitored object by relay zoom according to the order in which the at least two PIR sensors 13 send the monitoring start instruction information.

[0053] Figure 1 This is a schematic diagram of the imaging system structure. Figure 1 The infrared human body PIR sensor shown is used to characterize the various PIR sensors included in the imaging system.

[0054] The controller can be a microprocessor, CPU, etc. The PIR sensor sends a monitoring start instruction to the controller when it senses the radiation band of the monitored object. The monitored object can be a person or other objects. Taking a person as an example, the radiation band can be the 9.5μm band of human radiation. When the controller receives the monitoring start instruction, it controls the camera lens to start. At this time, the PIR sensor senses the monitored object entering the monitored area and monitors and tracks the object through the camera lens.

[0055] Specifically, the imaging system of this application includes at least two PIR sensors; the at least two PIR sensors have different monitoring distances. The PIR sensors are used to sense the radiation band of the monitored object and send monitoring start indication information to the controller. The controller controls the camera lens 12 to track the monitored object by relay zoom, according to the order in which the at least two PIR sensors send the monitoring start indication information. For example, when the PIR sensor at a longer monitoring distance senses the radiation band of the monitored object and sends the monitoring start indication information to the controller, the controller controls the focal length of the camera lens to be adjusted to a telephoto state, thereby enabling clear monitoring and tracking of distant monitored objects. When the monitored object approaches from a distance, triggering the PIR sensor at a shorter monitoring distance to sense the radiation band of the monitored object, the PIR sensor at the shorter monitoring distance sends the monitoring start indication information to the controller. At this time, the controller controls the focal length of the camera lens to be adjusted to a short focal length state, thereby enabling clear monitoring and tracking of nearby monitored objects.

[0056] In this application, the imaging system includes a controller, a camera lens, and at least two PIR sensors with different monitoring distances. The system uses these two PIR sensors with different monitoring distances to sense intrusion into a monitored object and sends a monitoring activation instruction to the controller. The controller receives the monitoring activation instruction, activates the camera lens, and, according to the order in which the monitoring activation instructions are sent by the two PIR sensors, controls the camera lens to track the monitored object through relay zoom. By using at least two PIR sensors with different monitoring distances to achieve relay sensing of the monitored object and controlling the camera lens to track the monitored object through relay zoom, relay monitoring is achieved. Furthermore, relay zoom can improve the image clarity of the monitored object, thereby enhancing the monitoring effect.

[0057] In this application, the controller is used to store the correspondence between the at least two PIR sensors and the focal length respectively;

[0058] The at least two PIR sensors are used to send the monitoring start instruction information to the controller when they sense the radiation band of the monitored object, and carry their own identification information in the monitoring start instruction information;

[0059] The controller is configured to receive the monitoring start instruction information and obtain the identification information of the target PIR sensor carried therein, determine the target focal length corresponding to the target PIR sensor based on the identification information of the target PIR sensor, control the camera lens to adjust the focal length to the target focal length for focusing, and track the monitored object.

[0060] The PIR sensor relay imaging system provided in this application has different PIR sensors corresponding to different focal lengths of camera lenses, which can realize relay sensing of the monitored object and control the camera lens to adjust to the corresponding focal length to realize relay focusing and capturing of the monitored object.

[0061] When a PIR sensor detects the radiation band of a monitored object, it sends a monitoring start instruction to the controller, carrying its own identification information within the instruction. This identification information can be the PIR sensor's unique identifier or pre-configured information. For example, an imaging system might include two PIR sensors. The sensor with a longer monitoring distance is pre-configured as PIR sensor a, and the sensor with a shorter monitoring distance is pre-configured as PIR sensor b. The camera lens corresponding to the PIR sensor with the longer monitoring distance has a larger focal length, while the camera lens corresponding to the PIR sensor with the shorter monitoring distance has a smaller focal length.

[0062] When a PIR sensor with a longer monitoring distance senses the radiation band of the monitored object, it sends a monitoring start instruction to the controller, carrying "PIR sensor a" in the instruction. The controller receives the monitoring start instruction and obtains the identification information of the target PIR sensor carried within it. At this time, the target PIR sensor is the one with a longer monitoring distance, and its identification information is "PIR sensor a". Based on the pre-saved correspondence between at least two PIR sensors and their focal lengths, the target focal length corresponding to the target PIR sensor with the identification information "PIR sensor a" can be determined. The camera lens is then controlled to adjust its focal length to the target focal length for focusing, thus tracking the monitored object.

[0063] When a PIR sensor with a relatively short monitoring distance senses the radiation band of the monitored object, it sends a monitoring start instruction to the controller, carrying "PIR sensor b" in the monitoring start instruction. The controller receives the monitoring start instruction and obtains the identification information of the target PIR sensor carried in it. At this time, the target PIR sensor is the PIR sensor with a relatively short monitoring distance, and the identification information of the target PIR sensor is "PIR sensor b". Based on the pre-saved correspondence between at least two PIR sensors and their focal lengths, the target focal length corresponding to the target PIR sensor with the identification information "PIR sensor b" can be determined. The camera lens is then controlled to adjust its focal length to the target focal length for focusing, and the monitored object is tracked.

[0064] In this application, the controller is used to adjust the focal length of the camera lens to the focal length corresponding to the PIR sensor with the farthest monitoring distance when it receives the monitoring start instruction information sent by the PIR sensor with the farthest monitoring distance, and to capture an image of the monitored object.

[0065] The controller is configured to, when receiving monitoring start indication information from two or more PIR sensors, control the camera lens to adjust its focus to capture an image of the monitored object and record video of the monitored area according to the order in which the monitoring start indication information was sent.

[0066] This application controls the camera lens to perform different actions based on the different positions of the monitored object. When a monitoring start instruction is received from the PIR sensor with the farthest monitoring distance, meaning the monitored object has just entered the monitoring area, the camera lens is controlled to adjust its focus to the focal length corresponding to the farthest PIR sensor and capture an image of the monitored object, ensuring the clarity of the captured image. When monitoring start instruction messages are received from two or more PIR sensors, meaning the monitored object is moving from far to near within the monitoring area, the camera lens is controlled to adjust its focus to capture an image of the monitored object according to the order in which the monitoring start instruction messages are sent, and the monitoring area is recorded. For example, the imaging system includes four PIR sensors: PIR sensor 1, PIR sensor 2, PIR sensor 3, and PIR sensor 4. The monitoring distances of the four PIR sensors, from near to far, are PIR sensor 1, PIR sensor 2, PIR sensor 3, and PIR sensor 4. For example, if a monitoring start instruction message is received first from PIR sensor 4, the camera lens is controlled to adjust its focus to the focal length corresponding to PIR sensor 4 and capture an image of the monitored object. Then, upon receiving a monitoring start instruction from PIR sensor 3, the camera lens is controlled to adjust its focus to the corresponding focal length of PIR sensor 3 for focusing, capturing images of the monitored object, and recording video tracking. Next, upon receiving a monitoring start instruction from PIR sensor 2, the camera lens is controlled to adjust its focus to the corresponding focal length of PIR sensor 2 for focusing, capturing images of the monitored object, and recording video tracking. Finally, upon receiving a monitoring start instruction from PIR sensor 1, the camera lens is controlled to adjust its focus to the corresponding focal length of PIR sensor 1 for focusing, capturing images of the monitored object, and recording video tracking.

[0067] In this application, the partitioned structure of the at least two PIR sensors is designed using metasurface materials according to at least two focal lengths of the camera lens; the monitoring distance of the at least two PIR sensors is not less than the shooting distance when the corresponding focal length of the camera lens is focused.

[0068] Ideally, the monitoring distance of at least two PIR sensors can be matched with the shooting distance when the focal length of their respective camera lenses is focused. This ensures that when monitoring the monitored area, the monitored object can be monitored.

[0069] The PIR sensor's partitioned structure utilizes metasurface materials, designed according to the camera lens's focal length. Compared to HDPE materials, it offers higher recognition accuracy and is less affected by factors such as temperature and sunlight, resulting in better accuracy in waking up the camera lens. The PIR sensor's monitoring distance is matched to the camera lens's surveillance distance, preventing situations where the camera fails to wake up after an intrusion, or where the camera wakes up but the intruder is not within the monitoring range, thus improving monitoring effectiveness.

[0070] The at least two PIR sensors each include a sector-shaped partition structure, which includes a sector-shaped bright area structure and a sector-shaped dark area structure arranged at intervals; when at least one sector-shaped bright area structure and at least one sector-shaped dark area structure both sense the radiation band of the monitored object, a monitoring start instruction message is sent to the controller.

[0071] Among them, the longer the monitoring distance of a PIR sensor, the fewer the fan-shaped bright area structures and fan-shaped dark area structures it contains. The longer the monitoring distance of a PIR sensor, the longer the fan-shaped radius of its fan-shaped partition structure.

[0072] The camera lens includes a zoom lens.

[0073] If the imaging system includes two PIR sensors, a metasurface material can be used to design the partitioned structure of one PIR sensor based on the minimum focal length of the zoom lens; the same metasurface material can be used to design the partitioned structure of the other PIR sensor based on the maximum focal length of the zoom lens. Thus, when the PIR sensor designed for the minimum focal length of the zoom lens senses the radiation band of the monitored object and sends a monitoring start instruction to the controller, the controller adjusts the camera lens's focal length to the minimum focal length to capture images and record video of the monitored area. Similarly, when the PIR sensor designed for the maximum focal length of the zoom lens senses the radiation band of the monitored object and sends a monitoring start instruction to the controller, the controller adjusts the camera lens's focal length to the maximum focal length to capture images and record video of the monitored area.

[0074] If the imaging system includes two or more PIR sensors, the focal length of the camera lens can be divided according to the number of PIR sensors. For example, with four PIR sensors, four focal lengths of the camera lens can be obtained. These four focal lengths include the maximum and minimum focal lengths of the camera lens, as well as the two focal lengths between the maximum and minimum focal lengths. The four focal lengths can be obtained by equal or uneven division. Using metasurface materials, a corresponding partition structure of the PIR sensors is designed based on each of the four focal lengths of the zoom lens, and a correspondence between the four focal lengths and the four PIR sensors is established.

[0075] For example, after the controller designs the partition structure of one of the PIR sensors based on the minimum focal length of the zoom lens, the controller will establish a correspondence between the minimum focal length of the zoom lens and that one of the PIR sensors; after the controller designs the partition structure of another PIR sensor based on the maximum focal length of the zoom lens, the controller will establish a correspondence between the maximum focal length of the zoom lens and that other PIR sensor.

[0076] The PIR sensor relay imaging system provided in this application has different PIR sensors corresponding to different focal lengths of camera lenses, which can realize relay sensing of the monitored object and control the camera lens to adjust to the corresponding focal length to realize relay focusing and capturing of the monitored object.

[0077] Figure 2 This is a schematic diagram of the imaging system structure provided in this application. The imaging system also includes: an alarm 14;

[0078] The controller is also configured to send alarm indication information to the alarm device when it receives the monitoring start indication information;

[0079] The alarm device is used to output alarm information indicating that the monitored object has entered the monitoring range when it receives the alarm indication information.

[0080] The alarm device includes at least one of mechanical and electronic alarm devices. Electronic alarm devices include, but are not limited to, audible and visual alarms. After receiving a monitoring activation instruction, the controller indicates that the monitored object has entered the monitored area, and at this time, the controller controls the alarm device to output an alarm notification.

[0081] Figure 3 This is a schematic diagram of the imaging system structure provided in this application. The imaging system further includes: a terminal device 15;

[0082] The controller is also configured to send a prompt message to the terminal device, indicating that the monitored object has entered the monitoring range, when it receives the monitoring start instruction information.

[0083] Terminal devices can be mobile terminals, computers, or other devices used by managers of the monitored area. The controller can send alerts to the terminal devices via email, SMS, telephone, or other communication methods to indicate that a monitored object has entered the monitoring range. It can also send captured images and videos to the terminal devices at the same time.

[0084] The controller is also used to control the camera lens to enter a sleep state when it stops receiving monitoring start instruction information sent by the PIR sensor.

[0085] In other words, when the monitored object leaves the monitored area, the controller puts the camera into a sleep state, thereby reducing the power consumption of the camera.

[0086] Figure 4 The imaging control process diagram provided in this application includes the following steps:

[0087] S101: The controller receives the monitoring start indication information sent by at least two PIR sensors, wherein the monitoring start indication information is sent to the controller by the at least two PIR sensors when they sense the radiation band of the monitored object.

[0088] S102: Based on the order in which the monitoring start instruction information is sent by the at least two PIR sensors, control the camera lens to track the monitored object through relay zoom.

[0089] This application employs metasurface materials as key components of PIR lenses. The metasurface can be designed for the main wavelength band of human radiation (9.5μm). By relaying multiple PIR devices with different focal lengths, the dormant device can be woken up.

[0090] Figure 5 The working principle diagram of the low-power camera provided in this application is illustrated using an imaging system that includes four PIR sensors as an example. Figure 6 This is a schematic diagram of the partition structure of the first PIR sensor (region 1) provided in this application. Figure 7 This is a schematic diagram of the partition structure of the second PIR sensor (region 2) provided in this application. Figure 8 This is a schematic diagram of the partition structure of the third PIR sensor (3 zones) provided in this application. Figure 9 A schematic diagram of the partition structure of the fourth PIR sensor (4 zones) provided in this application. Figure 10 The overall partitioning structure diagram of the four PIR sensors provided in this application.

[0091] The working principle model is introduced as follows:

[0092] Camera lens: priority zoom lens, selective focus lens, camera system can be in various forms such as PTZ camera, bullet camera;

[0093] The PIR relay module uses at least a dual-element PIR sensor to enhance its resistance to environmental interference; the PIR lens employs metasurface material and features a narrowband design in the 9.5μm wavelength range. The design model is as follows: Figure 9 ;

[0094] The PIR module can be designed with 4 relays, but not limited to 4. Each PIR lens has a different focal length and zone, and the PIR sensor can adjust its own pitch angle to ensure that the combined module can well cover the camera's field of view.

[0095] The PIR lens design in Zone 1 prioritizes the field of view requirement, while Zone 2 can reduce the field of view and increase the axial detection distance; the same applies to Zones 3 and 4. The ultimate goal is to be compatible with the field of view changes during zoom lens magnification. The PIR lens partitioning of each zone can be designed to be compatible with the focal length of the lens and the monitoring distance. For example, if the lens is an f=4-12mm zoom lens, the PIR lens design in Zone 1 is designed for an axial recognition distance of 10m, Zone 2 for 15m, Zone 3 for 20m, and Zone 4 for 30m. This ensures that the camera can perform facial recognition on personnel after the device is awakened by personnel intrusion.

[0096] The PIR lens is matched with the lens focal length; that is, for a lens to observe a distance of 30m, the PIR lens should be able to match a detection distance of 30m. In other words, the detection range corresponding to the focal length of the PIR lens is 30m. Similarly, different lens focal lengths need to be matched with corresponding PIR lens focal lengths. The metasurface will modulate light in the 9.5μm band, which can be achieved by designing microstructures on the metasurface, such as columnar structures, fin structures, etc. Different designs result in different focal lengths for the PIR lenses. Each set of PIR lenses has a different focal length, and therefore a different detection distance. However, due to the influence of distance (light intake), the farther the detection distance, the smaller the detection area and the less the distribution of bright and dark areas. But because the focal length of the lens itself is longer, the field of view will be smaller, which can be well matched.

[0097] Figure 11 The imaging control flowchart provided in this application utilizes metasurfaces instead of traditional HDPE material PIR lenses. It can be individually designed in the 9.5μm band according to specific changes in identification, resulting in higher PIR accuracy. The PIR relay scheme is adopted, and the distribution of PIR lens identification areas is designed entirely according to the lens focal length and FOV. The power consumption of the device can be changed according to the location of personnel intrusion, such as sleep mode, low power mode, and full power mode, effectively realizing device power control. It can be linked with sound and light alarm devices and mobile APP.

[0098] By using metasurface materials instead of traditional HDPE materials, PIR lenses can be specially designed with different focal lengths, zones, and field of view to meet different needs; a PIR relay solution is adopted to achieve low power consumption of the equipment, which can be divided into sleep mode, low power mode, and full power mode; PIR alarm can be linked with sound and light alarm module and mobile APP module; the camera can automatically track and focus according to the PIR alarm location.

[0099] This application is mainly designed for specific radiation bands of the human body, and is not limited to human intrusion. It can also be specially designed for the intrusion prevention and control of targets with different radiation bands, such as animals.

[0100] This application also provides a controller, such as Figure 12 As shown, it includes: processor 301, communication interface 302, memory 303 and communication bus 304, wherein processor 301, communication interface 302 and memory 303 communicate with each other through communication bus 304;

[0101] The memory 303 stores a computer program, which, when executed by the processor 301, causes the processor 301 to perform any of the above method steps.

[0102] The communication bus mentioned in the controller above can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0103] Communication interface 302 is used for communication between the above controller and other devices.

[0104] The memory may include random access memory (RAM) or non-volatile memory (NVM), such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0105] The processors mentioned above can be general-purpose processors, including central processing units, network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits, field-programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0106] This application also provides a computer-readable storage medium storing a computer program executable by a controller, which, when run on the controller, causes the controller to perform any of the above method steps.

[0107] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0108] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An imaging system, characterized in that, The imaging system includes: a controller, a camera lens, and at least two infrared human body PIR sensors; the at least two PIR sensors have different monitoring distances; The at least two PIR sensors are used to send monitoring start instruction information to the controller when they sense the radiation band of the monitored object. The controller is configured to receive the monitoring start indication information sent by the at least two PIR sensors, and control the camera lens to perform relay tracking of the monitored object by relay zoom according to the order in which the at least two PIR sensors send the monitoring start indication information; The partitioned structure of the at least two PIR sensors is designed using metasurface materials according to at least two focal lengths of the camera lens; the monitoring distance of the different PIR sensors is matched with the different monitoring distances of the camera lens. The at least two PIR sensors each include a sector-shaped partition structure, which includes a sector-shaped bright area structure and a sector-shaped dark area structure arranged at intervals; when at least one sector-shaped bright area structure and at least one sector-shaped dark area structure both sense the radiation band of the monitored object, a monitoring start instruction message is sent to the controller. Among them, the longer the monitoring distance of a PIR sensor, the fewer the sector-shaped bright area structure and sector-shaped dark area structure it contains; the longer the monitoring distance of a PIR sensor, the longer the sector radius of its sector-shaped partition structure. The controller is used to store the correspondence between the at least two PIR sensors and their focal lengths; wherein, different PIR sensors correspond to different focal lengths of the camera lens; The at least two PIR sensors are used to send the monitoring start instruction information to the controller when they sense the radiation band of the monitored object, and carry their own identification information in the monitoring start instruction information; The controller is configured to receive the monitoring start instruction information and obtain the identification information of the target PIR sensor carried therein, determine the target focal length corresponding to the target PIR sensor according to the identification information of the target PIR sensor, control the camera lens to adjust the focal length to the target focal length for focusing, and track the monitored object. The controller is configured to, when receiving monitoring start indication information sent by two or more PIR sensors, control the camera lens to adjust its focus to capture an image of the monitored object and record video of the monitored area according to the order in which the monitoring start indication information is sent, so that the camera lens performs different actions according to the different positions of the monitored object.

2. The imaging system as described in claim 1, characterized in that, The controller is used to adjust the focal length of the camera lens to the focal length corresponding to the PIR sensor with the farthest monitoring distance when it receives the monitoring start instruction information sent by the PIR sensor with the farthest monitoring distance, and to capture an image of the monitored object.

3. The imaging system as described in claim 1, characterized in that, The monitoring distance of the at least two PIR sensors is not less than the shooting distance when the focal length of their respective camera lenses is focused.

4. The imaging system according to any one of claims 1 to 3, characterized in that, The imaging system also includes: an alarm; The controller is also configured to send alarm indication information to the alarm device when it receives the monitoring start indication information; The alarm device is used to output alarm information indicating that the monitored object has entered the monitoring range when it receives the alarm indication information.

5. The imaging system according to any one of claims 1 to 3, characterized in that, The imaging system also includes: a terminal device; The controller is also configured to send a prompt message to the terminal device, indicating that the monitored object has entered the monitoring range, when it receives the monitoring start instruction information.

6. The imaging system according to any one of claims 1 to 3, characterized in that, The controller is also used to control the camera lens to enter a sleep state when it stops receiving monitoring start instruction information sent by the PIR sensor.

7. An imaging control method, characterized in that, The method includes: The controller receives monitoring start indication information sent by at least two PIR sensors, wherein the monitoring start indication information is sent to the controller by the at least two PIR sensors when they sense the radiation band of the monitored object; wherein the controller stores the correspondence between the at least two PIR sensors and their focal lengths, and different PIR sensors correspond to different focal lengths of the camera lens; the monitoring start indication information carries the identification information of the target PIR sensor; For each received monitoring start instruction message, the identification information of the target PIR sensor carried in the monitoring start instruction message is obtained, the target focal length corresponding to the target PIR sensor is determined according to the identification information of the target PIR sensor, and the focal length of the camera lens is adjusted to the target focal length for focusing, so as to track the monitored object; When a monitoring start instruction is received from two or more PIR sensors, the camera lens is controlled to perform relay tracking of the monitored object by relay zoom according to the order in which the monitoring start instruction is sent by the at least two PIR sensors. The camera lens is also controlled to adjust its focus to capture an image of the monitored object and record video of the monitored area. This allows the camera lens to perform different actions depending on the different positions of the monitored object. The partitioned structure of the at least two PIR sensors is designed using metasurface materials according to at least two focal lengths of the camera lens; the monitoring distance of the different PIR sensors is matched with the different monitoring distances of the camera lens. The at least two PIR sensors each include a sector-shaped partition structure, which includes spaced sector-shaped bright area structures and sector-shaped dark area structures. When at least one sector-shaped bright area structure and at least one sector-shaped dark area structure both sense the radiation band of the monitored object, a monitoring start instruction message is sent to the controller. The PIR sensor with a longer monitoring distance contains fewer sector-shaped bright area structures and sector-shaped dark area structures. The PIR sensor with a longer monitoring distance has a longer sector-shaped radius.

8. A controller, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When a processor executes a program stored in memory, it implements the steps of the method described in claim 7.

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