Intelligent traffic system

Abstract

The invention relates to the technical field of intelligent traffic, and provides an intelligent traffic system, which comprises a clock module, traffic image equipment, an image signal processor and a control chip, and is characterized in that the clock module is in communication connection with the traffic image equipment and the image signal processor, and is provided with a main register; the clock module sends a frame synchronization signal to the traffic image equipment and the image signal processor, and the master register is used for sending a timestamp to the slave register of the image signal processor; the traffic image equipment starts to collect image information of a traffic road when receiving the frame synchronization signal, and an image signal processor generates time-aligned frame data from the image information according to the frame synchronization signal; the control chip obtains the starting time of the frame data according to the timestamp of the register and obtains the accurate starting time of the multiple pieces of frame data, the reasoning accuracy of the control chip is improved, and therefore the compatibility of the frame data is improved.

Description

Technical Field

[0001] The present invention relates to the field of intelligent transportation technology, and in particular to an intelligent transportation system. Background Art

[0002] Intelligent Transportation System (ITS) is a real-time, accurate and efficient intelligent transportation network management system that effectively integrates advanced information technology, communication technology, sensor technology, control technology and computer technology. It is an effective means to comprehensively solve the transportation safety and traffic congestion of the transportation network.

[0003] The existing intelligent transportation system collects road information with the help of information collection equipment such as laser radar and / or camera. The frame rates of different types of information collection equipment and different models of information collection equipment are not necessarily the same. For example, the frame rate of some laser radars and / or cameras is 10Hz, the frame rate of some laser radars and / or cameras is 30Hz, and the frame rate of some laser radars and / or cameras is 60Hz, resulting in inconsistent frame data timing. In order to make the frame data compatible with each other and improve the inference accuracy of traffic information, the frame rate used by the information collection equipment must be consistent. Therefore, the existing intelligent transportation system has the technical problem of poor frame data compatibility. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent transportation system, aiming to solve the technical problem of poor frame data compatibility in the existing intelligent transportation system.

[0005] The present application provides an intelligent transportation system, which includes a clock module, a traffic image device, an image signal processor and a control chip. The clock module is respectively connected to the traffic image device and the image signal processor for communication. The clock module is provided with a master register. The clock module sends a frame synchronization signal to the traffic image device and the image signal processor. The master register is used to send a timestamp to a slave register of the image signal processor. The traffic image device starts to collect image information of a traffic road upon receiving the frame synchronization signal. The image signal processor generates time-aligned frame data from the image information according to the frame synchronization signal. The control chip obtains the start time of the frame data according to the timestamp of the slave register.

[0006] In one embodiment, there are multiple clock modules, one of which is a master hardware clock, and the remaining clock modules are slave hardware clocks. The master hardware clock sends a frequency differential value and a time differential value to the slave hardware clocks, and the slave hardware clock corrects the frame synchronization signal according to the frequency differential value, and the slave hardware clock corrects the timestamp according to the time differential value.

[0007] In one of the embodiments, the intelligent transportation system further includes a console, the main hardware clock is installed on the console, and the console is equipped with a display screen, the display screen has at least two display areas, and each display area is used to display different image information.

[0008] In one embodiment, the display screen includes a plurality of pixels, and the plurality of pixels are distributed in an array, each of the pixels includes a first sub-pixel and a second sub-pixel that are independently controlled, the orientation of the first sub-pixel is different from the orientation of the second sub-pixel, all of the first sub-pixels are used to display the image information taken by one of the traffic imaging devices, and all of the second sub-pixels are used to display the image information taken by another of the traffic imaging devices.

[0009] In one embodiment, each of the pixels further includes an independently controlled third sub-pixel, the orientation of the third sub-pixel is different from the orientations of the first sub-pixel and the second sub-pixel, and all the third sub-pixels are used to display the image information captured by another of the traffic imaging devices.

[0010] In one embodiment, the traffic image device is a laser radar, and the laser radar is integrated into the control chip.

[0011] In one embodiment, the laser radar includes an optical chip, an electrical chip and a laser. The optical chip is electrically mounted on the control chip, the electrical chip is electrically connected to a side of the optical chip away from the control chip, the laser is mounted on the control chip, and the laser is optically coupled to the optical chip.

[0012] In one of the embodiments, a coupling lens and an isolator are provided between the laser and the optical chip, and the light beam emitted by the laser is coupled to the optical chip via the coupling lens and the isolator, and then emitted outwardly via the optical chip.

[0013] In one of the embodiments, the control chip is provided with a heat sink, and the laser is mounted on the cold end of the heat sink via a heat sink.

[0014] In one embodiment, the traffic image device is a camera, and the camera is integrated into the control chip.

[0015] The beneficial effects of the intelligent transportation system provided by the present invention are as follows: when traffic image devices with different frame rates receive frame synchronization signals sent by a clock module, they start to collect image information of traffic roads, thereby achieving a unified collection start time; an image signal processor generates frame data from image information captured by traffic image devices with different frame rates, performs different frequency divisions on the image information according to different frame synchronization signals corresponding to different frame rates, and achieves time alignment corresponding to specific frames with a unified collection start time; a control chip obtains accurate start times of multiple frame data according to timestamps stored in registers, thereby improving the reasoning accuracy of the control chip, and thus traffic services (such as real-time road condition display, traffic warning, etc.) based on these time-accurate and aligned frame data are more reliable and timely, thereby improving the travel experience and satisfaction of users, and solving the technical problem of poor frame data compatibility in existing intelligent transportation systems, thereby improving the compatibility of frame data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of an intelligent transportation system provided by an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of time alignment of frame data;

[0019] Figure 3 is a schematic diagram of a display screen in an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the structure of a pixel in a display screen;

[0021] Figure 5 Schematic diagram of the integration of lidar and control chip.

[0022] Among them, the reference numerals in the figure are:

[0023] 100, clock module; 110, main register; 200, traffic image device; 210, lidar; 211, optical chip; 212, electric chip; 213, laser; 214, coupling lens; 215, isolator; 220, camera; 300, image signal processor; 310, slave register; 400, control chip; 410, radiator; 420, heat sink; 510, display screen; 511, display area; 512, pixel; 513, first sub-pixel; 514, second sub-pixel; 515, third sub-pixel; 516, pressure sensor. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0026] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Combination Figure 1 and Figure 2 The present application provides an intelligent transportation system. The intelligent transportation system includes a clock module 100, a traffic image device 200, an image signal processor 300 and a control chip 400. The clock module 100 is respectively connected to the traffic image device 200 and the image signal processor 300 for communication. The clock module 100 is provided with a main register 110. The clock module 100 sends a frame synchronization signal to the traffic image device 200 and the image signal processor 300. The main register 110 is used to send a timestamp to a slave register 310 of the image signal processor 300. The traffic image device 200 starts to collect image information of the traffic road when receiving the frame synchronization signal. The image signal processor 300 generates time-aligned frame data from the image information according to the frame synchronization signal. The control chip 400 obtains the start time of the frame data according to the timestamp of the slave register 310.

[0030] When the traffic image devices 200 with different frame rates receive the frame synchronization signal sent by the clock module 100, they start to collect image information of the traffic road, so as to achieve a unified collection start time and zero time error. The image signal processor 300 generates frame data from the image information captured by the traffic image devices 200 with different frame rates, performs different frequency divisions on the image information according to different frame synchronization signals corresponding to different frame rates, and achieves time alignment for specific frames with a unified collection start time. The control chip 400 obtains the accurate start time of multiple frame data according to the timestamp stored in the register 310, thereby improving the inference accuracy of the control chip 400, and then the traffic services (such as real-time road condition display, traffic warning, etc.) based on these accurate and aligned frame data are more reliable and timely, improving the travel experience and satisfaction of users, and solving the technical problem of poor compatibility of frame data in the existing intelligent transportation system, thereby improving the compatibility of frame data.

[0031] Specifically, the clock module 100 may be a physical hardware clock (Precision Hardware Clock, PHC). The frame synchronization signal may be a PWM signal. Specifically, the intelligent transportation system may further include an interface module, such as an RS232 interface, an RS485 interface, a GPIO interface, a CAN bus, and an Ethernet interface. The clock module 100 synchronously sends a frame synchronization signal to the interface module, thereby realizing that all devices in the intelligent transportation system have a unified time reference.

[0032] Combination Figure 1 and Figure 2 , the clock module 100 sends multiple frame synchronization signals to provide second alignment capability. Different traffic image devices 200 have different frame rates. Under the control of the frame synchronization signal, the start acquisition time of the traffic image device 200 is determined, and the image acquisition time of all traffic image devices 200 is the same. One cycle of the frame synchronization signal corresponds to a specific frame, and the specific frame shooting time of all traffic image devices 200 is the same, see Figure 2 The dotted line in the middle is aligned with the seconds.

[0033] Specifically, Figure 2 The figure shows the timeline of the images captured by the traffic image devices 200 with five different frame rates. The starting time of the five image acquisition timelines is the same, that is, the clock module 100 aligns the PWM of the traffic image devices 200 by seconds. The traffic image devices 200 with different frame rates use different frame synchronization signals. The traffic image devices 200 with the same frame rate can be connected in series and controlled by the same frame synchronization signal to reduce the number of frame synchronization signals. The image signal processor 300 extracts frames from the frame data generated by multiple groups of traffic image devices 200, and divides the frequency by one cycle according to the frame synchronization signal to obtain the target maximum frame rate, and then divides the frequency by integers to obtain other frame rates. For example, first divide the frequency to obtain 60hz, and then divide the frequency by integers to obtain 30hz and 10hz, so that the frame synchronization signals of different frame rates can be aligned by seconds; and time alignment is achieved in specific frames (such as 10hz extraction), and equivalent frames are obtained to ensure the integer multiple relationship between different frame rates and extraction rates. The frame synchronization signals of different frame rates sent by the clock module 100 are aligned by seconds. The timestamp is completely aligned to the second of the equivalent frame extraction, improving the reasoning accuracy of the intelligent transportation system.

[0034] Specifically, when the image signal processor 300 receives the frame synchronization signal, it reads the time from the master register 110 and stores it in the local slave register 310. After obtaining the frame data of the traffic image device 200, the control chip 400 obtains the accurate exposure start time of the frame data from the register 310. The exposure time is a preset value, so the control chip 400 can calculate the accurate exposure center point time to improve the inference accuracy of the intelligent transportation system.

[0035] The processing time of the image signal processor 300 and the control chip 400 is uncertain, but the frame synchronization signal and the timestamp will not affect the calculation of the exposure center time. The control chip 400 can obtain the start time of the exposure according to the timestamp stored in the register 310.

[0036] In some embodiments, there are multiple clock modules 100, one of which is a master hardware clock, and the other clock modules 100 are slave hardware clocks. The master hardware clock sends a frequency differential value and a time differential value to the slave hardware clock. The slave hardware clock corrects the frame synchronization signal according to the frequency differential value, and the slave hardware clock corrects the timestamp according to the time differential value. In this way, only one master hardware clock needs to be determined to unify the time of the entire intelligent traffic processing system, which is a module that provides a reference time service within the system. Through the precise synchronization of the master and slave hardware clocks, it can be ensured that these devices work under the same time reference, thereby achieving efficient data collection, processing and transmission, which helps to improve the overall performance and efficiency of the system.

[0037] In an intelligent traffic processing system, each clock module 100 can only be a master hardware clock or a slave hardware clock, to avoid confusion of time base.

[0038] When used as a slave hardware clock, the slave hardware clock can correct its own frequency in real time through the frequency difference value and the time difference value, thereby maintaining a high degree of synchronization with the master hardware clock, reducing the system clock deviation caused by the accumulation of errors of a single clock module 100, and improving the time synchronization accuracy of the entire intelligent transportation system. Among them, the slave hardware clock can perform accurate time correction as needed, rather than continuously synchronizing with the master hardware clock, which helps to optimize the utilization of system resources.

[0039] In some embodiments, in combination Figure 3 and Figure 4 The intelligent transportation system further includes a control console, the main hardware clock is installed on the control console, and a display screen 510 is installed on the control console. The display screen 510 has at least two display areas 511, and each display area 511 is used to display different image information. Since the intelligent transportation system monitors a large number of road scenes, displaying multiple display areas 511 on one display screen 510 can save the number of display screens 510, save space and hardware costs, and is particularly suitable for places with limited space and directional viewing of different contents.

[0040] The multiple display areas 511 of the display screen 510 allow for the simultaneous display of different image information, such as traffic monitoring videos, real-time road condition data, traffic light status, traffic event alarms, etc., thereby improving the efficiency and flexibility of traffic information display and enabling traffic management personnel to have a more comprehensive understanding of traffic conditions.

[0041] In one embodiment, the display screen 510 includes a plurality of pixels 512, the plurality of pixels 512 are arranged in an array, each pixel 512 includes a first sub-pixel 513 and a second sub-pixel 514 which are independently controlled, the orientation of the first sub-pixel 513 and the orientation of the second sub-pixel 514 are different, all the first sub-pixels 513 are used to display the image information captured by one of the traffic image devices 200, and all the second sub-pixels 514 are used to display the image information captured by another traffic image device 200. The display screen 510 provides a structure of in-plane sub-pixels 512, which divides a sub-pixel 512 into a plurality of sub-pixels 512 ( Figure 3 Taking 3 as an example, each pixel 512 is divided into three sub-pixels 512), and each sub-pixel 512 can be independently controlled. In this way, different complete full-screen display images can be seen in a plane at different angles without interfering with each other.

[0042] For traffic management personnel, this one-screen multi-display design allows them to obtain more traffic information at the same time, reducing the trouble of switching between different display screens 510 and improving work efficiency. At the same time, clear and intuitive image information also helps them make decisions and respond faster.

[0043] Optionally, each display area 511 can also display two or more image information in the same display area 511 in sequence and alternately according to a preset cycle based on frame interleaving. Then, a shutter control signal is generated according to the frame start indication of each image information to be played, and the shutter control signal corresponds to a display area 511. The control chip 400 is used to send the shutter control signal to the corresponding display area 511. According to the shutter control signal, the display area 511 is controlled to start and close according to the preset cycle, so that the opening of the display area 511 is synchronized with the display of the corresponding traffic image to be played.

[0044] Specifically, combined Figure 3 and Figure 4 , each pixel 512 also includes an independently controlled third sub-pixel 515, the orientation of the third sub-pixel 515 is different from the orientation of the first sub-pixel 513 and the second sub-pixel 514, and all the third sub-pixels 515 are used to display the image information captured by another traffic image device 200, further enhancing the multi-display capability of one screen. Since the orientation of the third sub-pixel 515 is different from that of the first and second sub-pixels 514, they can present the best display effect at different angles, which helps to reduce visual interference and improve viewing comfort and clarity. At the same time, the coordinated work of multiple sub-pixels 512 can also enhance the three-dimensional sense and layering of the image, so that traffic management personnel can understand the traffic conditions more intuitively.

[0045] Specifically, combined Figure 3 A pressure sensor 516 is provided at the bottom of some pixels 512 . The pressure sensor 516 is used to switch the image signal of the display area 511 . One pressure sensor 516 corresponds to one display area 511 . Further, more image information can be displayed on the same display screen 510 .

[0046] In order to accurately identify the user's pressing operation, a pressure sensor 516 is set in a direction perpendicular to the pixel 512. The pressure sensor 516 is connected to the control chip 400 through an FPC or a PCB. When the user presses any one of the pressure sensors 516, the pressure sensor 516 generates a signal and transmits the signal to the control chip 400. The control chip 400 determines the user's pressing position through analysis and processing, and then outputs a corresponding instruction to adjust the display content of the display area 511. Specifically, the pressure sensor 516 sets a pressure threshold. When the pressure value in a certain pressure sensor 516 is greater than the pressure threshold, it is determined that the corresponding pressure sensor 516 is pressed. Specifically, when the user presses on several pressure sensors 516, the several pressure sensors 516 respectively generate different pressure values. By comparison, the pressure sensor 516 corresponding to the maximum pressure value is obtained, and then it is determined that the corresponding pressure sensor 516 is pressed.

[0047] In some embodiments, in combination Figure 1 and Figure 5 The traffic image device 200 is a laser radar 210, and the laser radar 210 is integrated into the control chip 400, which is conducive to the miniaturization, modularization and integration of the laser radar 210, and improves the system integration. In addition, the integrated design simplifies the structure of the intelligent traffic processing system, reduces the connection and wiring between components, and reduces the complexity and failure rate of the intelligent traffic processing system.

[0048] In addition, through the spatial optical coupling of the laser 213 and the chip module, the stability of optical transmission can be improved, the light input loss can be reduced, and the delay and loss of image information during the transmission process can be avoided.

[0049] In one embodiment, in combination Figure 5, the laser radar 210 includes an optical chip 211, an electric chip 212 and a laser 213. The optical chip 211 is electrically mounted on the control chip 400, and the electric chip 212 is electrically connected to the side of the optical chip 211 away from the control chip 400. Due to the reduction in package size and the simplification of structure, the difficulty and risk in the production process are also reduced. Compared with the separate assembly of the optical chip 211 and the electric chip 212, the stacked package integration of the optical chip 211 and the electric chip 212 significantly reduces the size of the laser radar 210. For large-scale arrays of optical chips 211 and electric chips 212, the entire laser radar 210 system is more compact and easy to integrate into various devices. The optical chip 211 does not need to be connected to the control chip 400 through multiple gold wires, and then transmits and processes data with the electric chip 212 through multiple gold wires, which greatly reduces the wiring difficulty and signal interference on the control chip 400.

[0050] The stacked packaging of the optical chip 211 and the electrical chip 212 realizes the shortest wiring path between the optical chip 211 and the electrical chip 212, reduces the attenuation and interference of the signal during the transmission process, and has a small wiring resistance, which helps to eliminate the signal transmission delay and distortion caused by the difference in wiring length, and improves the consistency between different paths.

[0051] Among them, the electrical chip 212 integrates output and control functions, which facilitates rapid data processing and data exchange with the optical chip 211 nearby, reducing the number of output channels through the optical chip 211. The optical chip 211 integrates related optical components such as detection and optical path functional devices, and is connected to the control chip 400 only through gold wire bonding, realizing the connection of the control, power, signal and other pins of the electrical chip 212, greatly reducing the number of wire bonding.

[0052] Optionally, the electric chip 212 is electrically connected to the optical chip 211 by flip-chip (FC), changing from the traditional wire bonding method to a direct metal bump connection, which greatly reduces the package size, is suitable for automated production lines, and can greatly improve production efficiency and reduce production costs. Flip-chip bonding can use advanced packaging processes such as chip flip-chip process, wafer flip-chip process, wafer rewiring process, wafer silicon through-hole process, glass through-hole process, etc., which are not specifically limited here.

[0053] The optical chip 211 may be a silicon-based chip, a glass-based chip, a liquid crystal chip, a MEMS chip, etc., which are not specifically limited here. The optical chip 211 includes but is not limited to: an OPA chip, an optical switch chip, and other optical chips 211 of the laser radar 210.

[0054] Specifically, the laser 213 is installed on the control chip 400, and the laser 213 is optically coupled with the optical chip 211. Compared with the laser 213 and the optical chip 211 being packaged through two-step end-face coupling, the signal is input in the form of optical fiber, which is easily affected by the environment in terms of volume and stability; in this solution, the laser 213 is spatially optically coupled with the chip module, which can effectively reduce the interference of external factors such as mechanical vibration and temperature change on the optical signal during transmission, improve the stability of optical transmission, reduce the scattering and attenuation of the optical signal during transmission, and the spatial optical coupling allows the laser beam to be directly coupled to the optical chip 211, reducing the energy loss in the intermediate link, reducing the optical input loss, and further reducing the size of the packaging module.

[0055] Specifically, a coupling lens 214 and an isolator 215 are arranged between the laser 213 and the optical chip 211. The light beam emitted by the laser 213 is coupled to the optical chip 211 through the coupling lens 214 and the isolator 215, and is emitted outward through the optical chip 211. The collimating lens can adjust the divergence angle of the light beam to make it parallel light or approximately parallel light, thereby improving the collimation of the light beam. The collimated light beam is then focused by the coupling lens 214, and the focal point and spot size of the light beam can be accurately controlled to ensure that the light beam can be efficiently coupled to the optical chip 211. The isolator 215 is an optical device that only allows light to pass in one direction, which can effectively prevent the reflected light from returning to the laser 213, avoid the reflected light from interfering in the optical path, and improve the stability and reliability of the system. Through precise beam control and coupling technology, the scattering and attenuation of the light beam during transmission can be reduced, thereby improving the optical transmission efficiency, reducing unnecessary optical path turns and reflections, and further reducing light loss.

[0056] In one embodiment, in combination Figure 5 The control chip 400 is provided with a heat sink 410, and the laser 213 is installed at the cold end of the heat sink 410 through a heat sink 420. The heat sink 410 is provided on the control chip 400, and the laser 213 is installed at the cold end of the heat sink 410 through a heat sink 420. The laser 213 generates a large amount of heat during operation. The heat sink 410 can quickly conduct the heat generated by the laser 213 through its efficient heat dissipation performance, which can significantly reduce the temperature of the laser 213, thereby extending its service life.

[0057] In some embodiments, the traffic image device 200 is a camera 220, which is integrated into the control chip 400, which is conducive to the miniaturization, modularization and integration of the camera 220, and improves the system integration. In addition, the integrated design simplifies the structure of the intelligent traffic processing system, reduces the connection and wiring between components, and reduces the complexity and failure rate of the intelligent traffic processing system.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent transportation system, characterized in that: The intelligent transportation system includes a clock module, a traffic image device, an image signal processor and a control chip. The clock module is respectively connected to the traffic image device and the image signal processor for communication. The clock module is provided with a master register. The clock module sends a frame synchronization signal to the traffic image device and the image signal processor. The master register is used to send a timestamp to a slave register of the image signal processor. The traffic image device starts to collect image information of the traffic road upon receiving the frame synchronization signal. The image signal processor generates time-aligned frame data from the image information according to the frame synchronization signal. The control chip obtains the start time of the frame data according to the timestamp of the slave register.

2. The intelligent transportation system according to claim 1, characterized in that: There are multiple clock modules, one of which is a master hardware clock, and the remaining clock modules are slave hardware clocks. The master hardware clock sends a frequency differential value and a time differential value to the slave hardware clocks, and the slave hardware clock corrects the frame synchronization signal according to the frequency differential value, and the slave hardware clock corrects the timestamp according to the time differential value.

3. The intelligent transportation system according to claim 2, characterized in that: The intelligent transportation system further comprises a control console, the main hardware clock is installed on the control console, and the control console is equipped with a display screen, the display screen has at least two display areas, and each display area is used to display different image information.

4. The intelligent transportation system according to claim 3, characterized in that: The display screen includes a plurality of pixels, and the plurality of pixels are distributed in an array. Each of the pixels includes a first sub-pixel and a second sub-pixel that are independently controlled. The orientation of the first sub-pixel is different from the orientation of the second sub-pixel. All of the first sub-pixels are used to display the image information taken by one of the traffic imaging devices, and all of the second sub-pixels are used to display the image information taken by another of the traffic imaging devices.

5. The intelligent transportation system according to claim 4, characterized in that: Each of the pixels further includes an independently controlled third sub-pixel, the orientation of the third sub-pixel is different from the orientations of the first sub-pixel and the second sub-pixel, and all the third sub-pixels are used to display the image information captured by another traffic image device.

6. The intelligent transportation system according to any one of claims 1 to 5, characterized in that: The traffic image device is a laser radar, and the laser radar is integrated into the control chip.

7. The intelligent transportation system according to claim 6, characterized in that: The laser radar includes an optical chip, an electrical chip and a laser. The optical chip is electrically mounted on the control chip, the electrical chip is electrically connected to a side of the optical chip away from the control chip, the laser is mounted on the control chip, and the laser is optically coupled to the optical chip.

8. The intelligent transportation system according to claim 7, characterized in that: A coupling lens and an isolator are arranged between the laser and the optical chip. The light beam emitted by the laser is coupled to the optical chip via the coupling lens and the isolator, and is emitted outward via the optical chip.

9. The intelligent transportation system according to claim 7, characterized in that: The control chip is provided with a radiator, and the laser is installed on the cold end of the radiator through a heat sink.

10. The intelligent transportation system according to any one of claims 1 to 5, characterized in that: The traffic image device is a camera, and the camera is integrated into the control chip.

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