A video monitoring device and system based on PTZ camera

Abstract

The present invention provides a video monitoring method, device and system based on a pan-tilt camera, which belongs to the field of video monitoring technology. When monitoring is required, the pan-tilt camera is installed and debugged, and the pan-tilt camera can rotate in the vertical direction and the horizontal direction. When the pan-tilt camera is remotely controlled online, the remote control terminal performs various video analysis and processing operations through a convolutional neural network and a deep learning model after receiving the video stream; when the camera detects an abnormal situation or a target, a real-time alarm is issued to notify the operator, and the relevant monitoring video is intercepted and uploaded to the server synchronously; when an abnormal situation or a target is detected, if the corresponding detected target is a moving target, then within a set range, the pan-tilt camera not only performs a commutation follow-up motion rotating around the vertical direction as an axis, but the pan-tilt camera as a whole also swings toward the moving direction of the moving target. The present invention can greatly expand the monitoring range, and has a high degree of intelligent identification.

Description

Technical Field

[0001] The invention relates to a video monitoring device, in particular to a video monitoring device and system based on a pan / tilt camera, belonging to the technical field of video monitoring. Background Art

[0002] The PTZ camera, also known as the electric PTZ, is equipped with two motors to achieve high-speed posture adjustment. The PTZ camera is a special camera device that combines camera and PTZ technology with high flexibility and adjustability. The PTZ camera plays an important role in the video surveillance system. It expands the surveillance range of the camera and is particularly suitable for scanning and monitoring a large area. The motor of the PTZ camera receives signals from the controller to achieve precise operation and positioning. By adjusting the horizontal and vertical angles of the PTZ, the camera can capture a wider range of images, improving the efficiency and accuracy of monitoring.

[0003] The existing pan-tilt camera can obtain a larger monitoring area during the monitoring process. However, in the process of video monitoring, on the one hand, simply relying on the two rotational degrees of freedom of the pan-tilt itself is not enough to increase the monitoring range, especially for the monitoring of moving targets, which can easily make the moving targets move out of the monitoring field of view; in addition, some of the current traditional video monitoring equipment still requires manual processing and analysis of the situation in the monitoring video, which increases the labor cost of video monitoring. At the same time, manual operation is prone to miss abnormal behaviors. Therefore, a video monitoring device and system based on a pan-tilt camera are proposed. Summary of the invention

[0004] In view of this, the present invention provides a video monitoring device and system based on a pan-tilt camera to solve or alleviate the technical problems existing in the prior art and greatly improve the monitoring field of view and monitoring handling performance.

[0005] The technical solution of the embodiment of the present invention is achieved as follows:

[0006] A video monitoring device based on a pan-tilt camera of the present invention first includes guide rails, wherein the guide rails include a first guide rail and a second guide rail which are arranged in an upper and lower manner, wherein the first guide rail is fixedly installed, and the second guide rail is hinged to the first guide rail so that the second guide rail can be deflected at a certain angle in a horizontal plane relative to the first guide rail, and the pan-tilt camera is linearly slidably installed on the second guide rail, and the pan-tilt of the pan-tilt camera is connected to the second guide rail via a linkage component so that when the pan-tilt rotates to a certain side, the second guide rail also rotates to a certain side.

[0007] Furthermore, the pan head is mounted on the bottom end of a sliding block for rotation around a vertical direction, and the upper end of the sliding block is mounted in the second guide rail for sliding cooperation; the second guide rail is mounted in the first guide rail for linear sliding through a slide, and the top end of the slide is linearly slidingly connected to the bottom end of the first guide rail, and the bottom end of the slide vertically passes through a slide groove opened on the second guide rail along its length direction, and then extends out of the bottom end of the second guide rail, and the slide can slide in the slide groove on the second guide rail after sliding into place along the first guide rail.

[0008] Furthermore, the linkage component includes an elastic telescopic arm, a roller, a driven rod, a sleeve and a connecting arm, wherein the roller is installed at the telescopic end of the elastic telescopic arm, and the other end of the elastic telescopic arm is fixed on the pan-tilt platform and can rotate together with the pan-tilt platform, the sleeve is rotatably installed at the bottom end of the slide, the driven rod is fixed on the sleeve, and the connecting arm fixedly connects the sleeve and the second guide rail as a whole, and the roller can contact the driven rod in a rolling manner, and when in contact, the elastic telescopic arm is always in a stretched state, so that when the elastic telescopic arm rotates around the vertical axis together with the pan-tilt platform, the roller pushes the driven rod to swing, causing the second guide rail to swing to the same side.

[0009] Further, the parts of the slide and the slider located in the second guide rail are driven by a screw rod rotatably mounted in the second guide rail, and the parts of the slide and the slider located in the second guide rail are rectangular block structures, so that when the screw rod rotates, the slide and the slider move synchronously;

[0010] The rectangular block structure of the slide is in the shape of a rectangular column with a length not less than one tenth of the length of the second guide rail, and the rectangular column is linearly slidably matched with the second guide rail.

[0011] Furthermore, the elastic telescopic arm comprises an inner insert arm and a socket arm, one end of the inner insert arm is inserted into the socket arm and connected via a tension spring, and the roller is mounted on one end of the inner insert arm exposed outside the socket arm;

[0012] There are a plurality of driven rods, all of which are arranged in a circular array around the axis of the slide, and in the path direction of the circular array, the initial length of the driven rods in a natural state gradually increases or decreases.

[0013] Finally, as a video surveillance system based on a pan-tilt camera of the present invention, a power module, a control module and a communication module are installed inside the camera on the pan-tilt, and the power module is electrically connected to the control module and the communication module, and the control module is signal-connected to the communication module; at the same time, it also includes a driving module, a camera module, a processing module, a communication module and a remote control module, the signal output end of the camera module is signal-connected to the signal input end of the processing module, the signal output end of the processing module is signal-connected to the signal input end of the communication module, the signal output end of the communication module is signal-connected to the signal input end of the remote control module, the remote control module is signal-connected to the server, and the remote control module is electrically connected to the driving module.

[0014] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution:

[0015] The present invention monitors the monitoring area and the monitoring target through a pan-tilt camera, superimposes the monitoring movement range of the pan-tilt camera itself and the superimposed movement of the guide rail, comprehensively improves the movement direction and range that the camera can achieve, greatly improves the flexibility of monitoring, and expands the monitoring field of view, especially for the monitoring of moving targets, the tracking and detection range has been greatly improved.

[0016] The present invention also automatically completes target detection, target tracking, behavior analysis and anomaly detection through convolutional neural networks and deep learning models, and after detecting abnormal situations or targets, it sends alarm signals to the site and remote ends at the same time, eliminating the need for manual processing and analysis of situations occurring in surveillance videos, thereby reducing the labor cost of video surveillance, improving the alarm response speed, and avoiding the omission of abnormal behaviors.

[0017] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a flow chart of a monitoring method in a specific embodiment of the present invention;

[0020] Figure 2A specific structural diagram of the monitoring device of the present invention;

[0021] Figure 3 for Figure 2 The structure diagram of the pan / tilt in the structure shown;

[0022] Figure 4 is an internal structure diagram of the camera in the present invention;

[0023] Figure 5 A front view of a monitoring device recommended by the present invention

[0024] Figure 6 for Figure 5 A schematic top view of a cross section above the second guide rail;

[0025] Figure 7 for Figure 6 An AA cross-sectional view in FIG.

[0026] Figure 8 for Figure 6 The schematic diagram of the structure shown after the gimbal rotates an angle;

[0027] Fig. 9 A schematic diagram of a plurality of driven rods is provided;

[0028] Fig.10 It is a front view of a specific slide;

[0029] Fig.11 It is a structural schematic diagram of an elastic telescopic arm;

[0030] Fig.12 This is a monitoring system architecture diagram of the present invention.

[0031] Figure numerals: first guide rail 1, second guide rail 2, slider 3, slide seat 6, elastic telescopic arm 7, inner insert arm 701, socket arm 702, tension spring 703, driven rod 8, roller 9, bushing 10, sliding cover 11, slide 12, slide seat 13, sound and light alarm 14, pan / tilt head 15, camera 16, power module 17, control module 18, communication module 19, connecting arm 20, rectangular column 21, screw rod 22. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. Figure 1As shown, an embodiment of the present invention provides a video monitoring method based on a pan-tilt camera, comprising the following steps:

[0034] Step 1: Install the PTZ camera, set the camera parameters, connect the camera communication terminal to the remote control terminal, and debug;

[0035] Step 2: Set monitoring area and monitoring target;

[0036] Step 3: Transmit the real-time video stream to the remote control terminal through the network;

[0037] Step 4: After receiving the video stream, the remote control terminal performs various video analysis and processing operations through convolutional neural networks and deep learning models;

[0038] Step 5: If an abnormal situation or target is detected, a real-time alarm is issued to notify relevant personnel;

[0039] Step 6: Store the uploaded video stream on the server.

[0040] In this embodiment, specifically: in step one, the installation location and number of the pan-tilt camera are determined based on monitoring requirements, coverage range, lighting conditions, power supply and network access factors to ensure that the pan-tilt camera covers the required monitoring area, and the pan-tilt camera used can achieve rotation in the vertical and horizontal directions as the axis. Set the camera parameters through the camera's control interface or management software. The parameters include resolution, frame rate, image quality, bitrate and privacy protection. During installation, determine the installation location and number of PTZ cameras according to the size and shape of the monitored area to ensure that the coverage of the PTZ cameras can cover all areas that need to be monitored. Consider the light conditions of the monitored area, including daytime and nighttime light conditions. If the light conditions are poor, you need to choose a PTZ camera with good low-light performance, or consider adding fill lights and other equipment to improve the light conditions. Ensure that the installation location has a reliable power supply and network access. Select the appropriate resolution according to actual needs, such as 2K, 4K, 1080P, and select a frame rate of 25fps or 30fps to ensure the continuity and real-time nature of the video. Adjust the image quality according to actual needs, including parameters such as brightness, contrast, and saturation to obtain the best visual effect. Reasonably set the bitrate according to network bandwidth and storage capacity. Set the shielding area according to actual needs to protect personal privacy.

[0041] It should be further specially explained that, in the present embodiment, when an abnormal situation or target is detected, if the corresponding detected target is a moving target, then within the set range, the pan-tilt camera not only performs a commutation following motion rotating around the vertical axis, but the pan-tilt camera as a whole also swings in the direction of motion of the moving target. The so-called swing means that the pan-tilt camera as a whole makes a planar motion in the horizontal plane. Such a superimposed motion effect can, when necessary, enable the monitored moving target to be located in the center of the monitoring field of view, or become the hardware structure basis for implementing the monitoring performance.

[0042] Specifically, the pan-tilt camera can be installed as a whole on the guide rail. If the cost of installation and use is not fully considered, the guide rail can be flexibly driven to rotate or move using existing driving elements to be superimposed on the movement of the pan-tilt camera. When the pan-tilt camera detects a moving target, the pan-tilt rotates toward the target moving side by rotating around the vertical axis, and the guide rail also gradually swings an angle toward the side of the target moving, that is, the planar movement mentioned above. During this period, the pan-tilt camera can also slide straight along its length on the guide rail to improve its monitoring field of view. In practice, similarly, the specific number of pan-tilt cameras to be installed is set according to the inclination of the initial installation of each guide rail. The inclination of the guide rail and the range to which the pan-tilt camera as a whole can swing toward the moving target must meet the range that needs to be covered by the monitoring and the lighting conditions on site.

[0043] In the method described above, in step one, the connection method between the camera communication terminal and the remote control terminal is one of a wired network or a wireless network. When debugging the pan-tilt camera, the operations of checking the video stream, testing the remote control and verifying the alarm function are completed in sequence. When checking the video stream, ensure that the camera is stably connected to the network, view the real-time video stream, ensure that the picture is clear and smooth, without any freezes or delays, adjust the angle and focal length of the camera to obtain the best picture quality, and when testing the remote control, try to adjust the pan-tilt angle, zoom, preset point and cruise scanning function of the camera through the remote control function.

[0044] In this embodiment, specifically: in step 2, when the monitored target is a moving target, a target tracking algorithm is used to continuously track the target, a target detection algorithm is used to detect the moving target, and a bounding box surrounding the target is generated, and the features of the target, including the color, shape, texture, size, and motion pattern of the target, are extracted, and the Kalman filter algorithm is used to find and track the target, and the target in the current frame is matched with the target in the previous frame to determine the position and movement path of the target. In step 4, the video analysis and processing operations include target detection, target tracking, behavior analysis, and anomaly detection. During the analysis process, a convolutional neural network is used to identify a specific object in a video frame, and a filtering algorithm or feature matching is used to locate the same target. The target behavior is analyzed by a deep learning model, and the accuracy of anomaly detection is improved by training the model. The convolutional neural network can learn to identify a specific object in a video frame through training and generate a bounding box for it. The filtering algorithm can predict the position of the target in the next frame, and the feature matching determines the same target by comparing the features of the target in adjacent frames. After identifying and tracking the target, the deep learning model can learn and understand the complex behavior pattern of the target and issue an alarm when an anomaly is detected. In order to improve the accuracy of anomaly detection, unsupervised learning or reinforcement learning methods can be used to continuously optimize the model. When an abnormal situation or target is detected, an alarm signal is sent to both the on-site and remote ends, notifying on-site personnel through sound and light alarms, and notifying remote control administrators through video pop-ups or calls.

[0045] Based on the above principle of the monitoring method, accordingly, as the first embodiment of the hardware structure design, the present invention also provides a monitoring device used in the video monitoring method of a pan-tilt camera, specifically as follows Figure 2-4 As shown, it includes a sliding cover 11, and a ram 12 is installed at each end of the sliding cover 11. A driving element slides the sliding cover 11 on the ram 12 in a straight line, and the sliding cover 11 never completely separates from the ram 12. The bottom of the sliding cover 11 is slidably connected to a slide seat 13, and the sliding cover 11 can facilitate the movement of the pan-tilt camera within a certain range. A sound and light alarm 14 can also be installed on the front surface of the slide seat 13, and a pan-tilt 15 is fixedly connected to the bottom of the slide seat 13. A camera 16 is installed at the bottom of the pan-tilt 15, and an alarm is sent to the on-site staff through the sound and light alarm 14. The pan-tilt 15 is responsible for realizing the rotation and tilt functions of the camera 16. A motor and a reducer are installed inside the pan-tilt 15 to ensure the smooth movement and precise positioning of the camera, and to realize the rotation and tilt functions of the camera.

[0046] For system configuration, Figure 4The camera 16 may be internally installed with a power module 17, a control module 18 and a communication module 19, the power module 17 is electrically connected to the control module 18 and the communication module 19, the control module 18 is signal-connected to the communication module 19, the power module 17 is used to provide a stable power supply for the camera 16 to ensure the normal operation of the equipment, the control module 18 is responsible for controlling the movement of the pan-tilt head 15 and the parameter adjustment of the camera 16, and the communication module 19 has a network communication function and can communicate with the remote control terminal through a wired or wireless network.

[0047] In addition to the above hardware structure design, this embodiment also introduces a better monitoring device, which has a low cost, is easy to maintain and use, and can even be manufactured by oneself, and can be used in the above video monitoring method. Specifically, one of the main structures includes a guide rail, such as Figure 5 and Figure 7 As shown, the guide rail includes a first guide rail 1 and a second guide rail 2 arranged in an upper and lower manner. The first guide rail 1 is fixedly installed, and the second guide rail 2 is hinged to the first guide rail 1 so that the second guide rail 2 can deflect a certain angle in the horizontal plane relative to the first guide rail 1, and the pan-tilt camera is installed on the second guide rail 2 in a linear sliding manner. The pan-tilt camera's pan-tilt head 15 is connected to the second guide rail 2 through a linkage component so that when the pan-tilt head 15 rotates to a certain side, the second guide rail 2 also rotates to a certain side. Specifically, as Figure 5-7 As shown, the pan / tilt 15 is mounted on the bottom end of a slider 3 so as to rotate around the vertical direction, and the upper end of the slider is mounted in the second guide rail 2 in a sliding manner, so as to realize the sliding of the camera on the second guide rail 2. At the same time, the second guide rail 2 is mounted in the first guide rail 1 in a linear sliding manner through a slide table, and the top end of the slide table is linearly slidably connected with the bottom end of the first guide rail 1, and the bottom end of the slide table vertically penetrates the second guide rail 2, and extends out of the bottom end of the second guide rail 2 after a slide groove is opened along its length direction, and the slide table can slide in the slide groove on the second guide rail 2 after sliding in a straight line along the first guide rail 1 to adjust the position flexibly.

[0048] like Figure 7 and Fig. 9The linkage components mentioned in the above text mainly include an elastic telescopic arm 7, a roller 9, a driven rod 8, a sleeve 10 and a connecting arm 20, wherein the telescopic end of the elastic telescopic arm 7 is installed with a roller 9, and the other end thereof is fixed on the pan-tilt 15 and can rotate with the pan-tilt 15. The sleeve 10 is rotatably installed at the bottom end of the slide, and the driven rod 8 is fixed on the sleeve 10, and the connecting arm 20 fixedly connects the sleeve 10 and the second guide rail 2 as a whole. The roller 9 can contact the driven rod 8 in a rolling manner, and when in contact, the elastic telescopic arm 7 is always in a stretched state, so that when the pan-tilt 15 rotates, the elastic telescopic arm 7 can also adaptively extend and retract when squeezing and pushing the driven rod 8, that is, when the elastic telescopic arm 7 rotates around the vertical axis with the pan-tilt 15, the roller 9 pushes the driven rod 8 to swing, so that the second guide rail 2 swings to the same side to achieve the following of the target object.

[0049] like Figure 6 As shown, the part of the slide and the slider 3 located in the second guide rail 2 is driven by a screw rod 22 rotatably installed in the second guide rail 2. The screw rod 22 can be driven by a micro motor (not shown in the figure) installed at the end of the second guide rail 2, and the part of the slide and the slider 3 located in the second guide rail 2 is a rectangular block structure, which plays a guiding role, so that when the screw rod 22 rotates, the slide and the slider 3 move synchronously. In order to better install the second guide rail 2 under the first guide rail 1, as shown in FIG. Fig.10 As shown, the rectangular block structure of the slide is in the shape of a rectangular column 21 whose length is not less than one tenth of the length of the second guide rail 2. The rectangular column 21 and the second guide rail 2 are linearly slidably matched and can be securely slidably mounted.

[0050] like Fig.11 The elastic telescopic arm 7 includes an inner insert arm 701 and a socket arm 702. One end of the inner insert arm 701 inserted into the socket arm 702 is connected through a tension spring 703. The roller 9 is installed on the end of the inner insert arm 701 exposed outside the socket arm 702. The structure is simple and reliable.

[0051] As a very special structural design, in this embodiment, the above-mentioned driven rods 8 are provided with a plurality of them, and all the driven rods 8 are arranged in a circular array around the axis of the slide, and in the path direction of the circular array, the initial length of the driven rods 8 in the natural state gradually increases or decreases. The purpose of such a design is that when the pan / tilt head 15 rotates, the elastic telescopic arm 7 can fall onto the next longer driven rod 8 each time it slides out of the driven rod 8, thereby achieving the purpose of continuously driving the second guide rail 2 to swing, expanding the swing angle, and even if it cannot ensure that the second guide rail 2 rotates one circle, it can achieve a swing of 90 degrees or even a larger range.

[0052] Finally, as a specific embodiment, a monitoring system used in the video monitoring method of a PTZ camera is also provided herein. Specifically, in addition to the modules configured in the aforementioned system, Fig.12 , also includes a driving module, a camera module, a processing module, a communication module and a remote control module, the signal output end of the camera module is signal-connected to the signal input end of the processing module, the signal output end of the processing module is signal-connected to the signal input end of the communication module, the signal output end of the communication module is signal-connected to the signal input end of the remote control module, the remote control module is signal-connected to the server, and the remote control module is electrically connected to the driving module.

[0053] When this monitoring system is working: determine the installation location and number of PTZ cameras according to monitoring requirements, coverage, light conditions, power supply and network access factors to ensure that the PTZ cameras cover the required monitoring area, connect the camera communication terminal to the remote control terminal and debug. When debugging the PTZ camera, complete the operations of checking the video stream, testing the remote control and verifying the alarm function in sequence, set the monitoring area and monitoring target, transmit the real-time video stream to the remote control terminal through the network, and after receiving the video stream, the remote control terminal performs various video analysis and processing operations. During the analysis process, the convolutional neural network is used to identify specific objects in the video frame, the filtering algorithm or feature matching is used to locate the same target, the target behavior is analyzed through the deep learning model, and the accuracy of anomaly detection is improved by training the model. After detecting abnormal situations or targets, an alarm signal is sent to the site and remote terminal at the same time, the site personnel are notified through the sound and light alarm, and the remote control terminal manager is notified through the video pop-up window or call. There is no need to manually process and analyze what happens in the monitoring video, which reduces the labor cost of video monitoring, improves the alarm response speed, and avoids the omission of abnormal behavior.

[0054] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A video monitoring method based on a PTZ camera, first installing and debugging the PTZ camera, then setting the monitoring area and monitoring target, ensuring that the PTZ camera can be remotely controlled online, characterized in that: The pan-tilt camera used can rotate in the vertical and horizontal directions. When the PTZ camera is remotely controlled online, the remote control end performs various video analysis and processing operations through convolutional neural networks and deep learning models after receiving the video stream. When the camera detects an abnormal situation or target, it issues a real-time alarm to notify the operator and simultaneously captures the relevant monitoring video and uploads it to the server. When an abnormal situation or target is detected, if the corresponding detected target is a moving target, then within the set range, the pan-tilt camera not only performs a reversing follow-up motion rotating around the vertical axis, but also the pan-tilt camera as a whole deflects in the moving direction of the moving target; The pan-tilt camera is integrally mounted on the guide rail. When the pan-tilt camera detects a moving target, the pan-tilt rotates toward the moving side of the target by rotating around a vertical axis, and the guide rail also gradually swings toward the moving side of the target by an angle, during which the pan-tilt camera can also slide linearly on the guide rail along its length direction; The specific number of PTZ cameras to be installed is set according to the inclination of the initial installation of each rail. The inclination of the rail and the range of the PTZ camera's overall swing toward the moving target must meet the range that needs to be covered by the monitoring and the lighting conditions on site.

2. A video monitoring method based on a PTZ camera as claimed in claim 1, characterized in that: The connection method between the camera communication terminal and the remote control terminal required for remote online control is one of wired network or wireless network; when installing and debugging the PTZ camera, the operations of checking the video stream, testing the remote control and verifying the alarm function are completed in sequence; When the monitored target is a moving target, the target tracking algorithm is directly used to continuously track the target; The video analysis and processing operations include target detection, target tracking, behavior analysis and anomaly detection. During the analysis process, a convolutional neural network is used to identify specific objects in the video frame, a filtering algorithm or feature matching is used to locate the same target, and a deep learning model is used to analyze the target behavior.

3. A monitoring device for implementing the video monitoring method of the PTZ camera of claim 1 or 2, characterized in that: The invention comprises guide rails, wherein the guide rails comprise a first guide rail (1) and a second guide rail (2) which are arranged in an upper and lower manner, the first guide rail (1) being fixedly installed, the second guide rail (2) being hinged to the first guide rail (1) so that the second guide rail (2) can be deflected at a certain angle in a horizontal plane relative to the first guide rail (1), the pan-tilt camera being linearly slidably installed on the second guide rail (2), the pan-tilt camera (15) being connected to the second guide rail (2) via a linkage component so that when the pan-tilt camera (15) rotates toward a certain side, the second guide rail (2) also rotates toward a certain side.

4. The monitoring device used in the video monitoring method of a PTZ camera as claimed in claim 3, characterized in that: The pan head (15) is mounted on the bottom end of a slider (3) so as to rotate in a vertical direction, and the upper end of the slider is mounted in the second guide rail (2) in a sliding manner; the second guide rail (2) is mounted in the first guide rail (1) in a linear sliding manner through a slide, and the top end of the slide is linearly slidably connected to the bottom end of the first guide rail (1), and the bottom end of the slide vertically passes through a slide groove provided along the length direction of the second guide rail (2) and extends out of the bottom end of the second guide rail (2), and the slide can slide in the slide groove on the second guide rail (2) after sliding in a linear manner along the first guide rail (1) to a position.

5. The monitoring device used in the video monitoring method of a PTZ camera as claimed in claim 4, characterized in that: The linkage component comprises an elastic telescopic arm (7), a roller (9), a driven rod (8), a sleeve (10) and a connecting arm (20), wherein the telescopic end of the elastic telescopic arm (7) is provided with the roller (9), and the other end of the elastic telescopic arm (7) is fixed on the pan-tilt platform (15) and can rotate together with the pan-tilt platform (15), the sleeve (10) is rotatably mounted on the bottom end of the slide, the driven rod (8) is fixed on the sleeve (10), and the connecting arm (20) fixedly connects the sleeve (10) and the second guide rail (2) as a whole, the roller (9) can contact the driven rod (8) in a rolling manner, and when in contact, the elastic telescopic arm (7) is always in a stretched state, so that when the elastic telescopic arm (7) rotates around the vertical axis together with the pan-tilt platform (15), the roller (9) pushes the driven rod (8) to swing, so that the second guide rail (2) swings toward the same side accordingly.

6. The monitoring device used in the video monitoring method of a PTZ camera as claimed in claim 5, characterized in that: The portion of the slide table and the slider (3) located in the second guide rail (2) is driven by a screw rod (22) rotatably mounted in the second guide rail (2), and the portion of the slide table and the slider (3) located in the second guide rail (2) is a rectangular block structure, so that when the screw rod (22) rotates, the slide table and the slider (3) move synchronously; The rectangular block structure of the slide is in the shape of a rectangular column (21) whose length is not less than one tenth of the length of the second guide rail (2), and the rectangular column (21) and the second guide rail (2) are linearly slidably matched.

7. The monitoring device used in the video monitoring method of a PTZ camera as claimed in claim 5, characterized in that: The elastic telescopic arm (7) comprises an inner insertion arm (701) and a socket arm (702), one end of the inner insertion arm (701) being inserted into the socket arm (702) and connected via a tension spring (703), and the roller (9) being mounted on the end of the inner insertion arm (701) exposed outside the socket arm (702); The elastic telescopic arms (7) are provided with a plurality of them, and all the elastic telescopic arms (7) are arranged in a circular array around the axis of the slide table, and in the path direction of the circular array, the initial length of the elastic telescopic arms (7) in a natural state gradually increases or decreases.

8. A monitoring system for implementing the video monitoring method of the PTZ camera of claim 1 or 2, characterized in that: A power module (17), a control module (18) and a communication module (19) are installed inside the camera (16) on the pan-tilt head (15); the power module (17) is electrically connected to the control module (18) and the communication module (19); and the control module (18) is signal-connected to the communication module (19); It also includes a driving module, a camera module, a processing module, a communication module and a remote control module. The signal output end of the camera module is signal-connected to the signal input end of the processing module, the signal output end of the processing module is signal-connected to the signal input end of the communication module, the signal output end of the communication module is signal-connected to the signal input end of the remote control module, the remote control module is signal-connected to the server, and the remote control module is electrically connected to the driving module.

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