Display device and road monitoring calibration system

Abstract

The utility model relates to the technical field of road traffic, and provides a display device and a road monitoring calibration system, the display device comprises a display unit and a speed odometer; the display unit comprises a display screen and a satellite communication module; the display screen is provided with a time display area, a speed display area and a mileage display area; the satellite communication module is used for receiving standard time, transmitting the standard time to the display screen and displaying the standard time in the time display area; the speed and mileage meter is used for detecting the speed and mileage of the mobile carrier and transmitting the speed and mileage to the display screen, the speed is displayed in the speed display area, and the mileage is displayed in the mileage display area. According to the utility model, the display device is used for being installed on the mobile carrier and can display the standard time and the speed and the mileage of the mobile carrier in real time, so that the time, the speed and the mileage can be conveniently obtained by road monitoring in real time, and real-time system calibration is carried out based on the obtained information.

Description

Technical Field

[0001] The utility model relates to the technical field of road traffic, in particular to a display device and a road monitoring calibration system. Background Art

[0002] Road monitoring systems generally have functions such as time display and speed measurement. The accuracy of speed measurement and time display directly affects the effectiveness of road monitoring.

[0003] To ensure the accuracy of road monitoring, it is usually necessary to calibrate the road monitoring system regularly. The existing calibration method is usually to measure the speed manually in real time, compare it with the speed measurement result of road monitoring, and then calculate the result for manual calibration. Most of the vehicle-mounted speed measurement devices currently on the market are usually aimed at ordinary family cars, which cannot be directly used for the calibration of road monitoring systems.

[0004] Therefore, a display device and a road monitoring calibration system are needed. The display device is used to be installed on the outside of a mobile vehicle and display the standard time, speed and mileage of the mobile vehicle in real time, so that road monitoring can obtain the standard time, speed and mileage information in real time, and perform real-time system calibration based on the obtained information. Utility Model Content

[0005] The purpose of the utility model is to provide a display device and a road monitoring calibration system, wherein the display device is used to be installed on the outside of a mobile vehicle, and displays the standard time, speed and mileage of the mobile vehicle in real time, so that road monitoring can obtain the standard time, speed and mileage information in real time, and perform real-time system calibration based on the obtained information.

[0006] In order to solve the above technical problems, the utility model provides a display device, including: a display unit and a speed odometer;

[0007] The display unit includes a display screen and a satellite communication module;

[0008] The display screen has a time display area, a speed display area and a mileage display area;

[0009] The satellite communication module is connected to the display screen;

[0010] The speed odometer is connected to the display screen.

[0011] Optionally, the display device also includes a remote control unit, which is directly connected to the satellite communication module, the speedometer and the display screen, and has a remote control display area for displaying the speed, the mileage and the standard time.

[0012] Optionally, the display unit further comprises a housing;

[0013] At least a portion of the display screen is disposed outside the shell, and the satellite communication module is disposed inside the shell.

[0014] Optionally, the display unit also includes a connecting bracket, which includes a connecting body and a first connecting terminal and a second connecting terminal. The connecting body is connected to the shell, and the first connecting terminal and the second connecting terminal are respectively connected to two ends of the connecting body. The first connecting terminal and the second connecting terminal have different heights to adjust the display angle of the display unit.

[0015] Optionally, the display unit further comprises a cover body, the shell is provided with an opening, and the cover body seals and covers the opening.

[0016] Optionally, the opening is opened on a first side wall of the housing, the display screen is mounted on a second side wall of the housing, and the first side wall and the second side wall are arranged opposite to each other;

[0017] When the display unit includes a connecting bracket, the connecting bracket is connected to a third side wall of the housing, and the third side wall is adjacent to the first side wall and the second side wall.

[0018] Optionally, at least one side of the opening has a water-retaining flange bent outward.

[0019] Optionally, the shell is provided with a cable hole for the cable to pass through.

[0020] The utility model also provides a road monitoring calibration system, including an image acquisition unit, an image extraction unit, a calibration unit, a mobile vehicle and the display device described above;

[0021] The display unit is disposed outside the mobile vehicle;

[0022] The image acquisition unit is arranged on the road to acquire the image of the mobile vehicle;

[0023] The image extraction unit is used to locate the image of the mobile vehicle and extract the standard time, the speed and the mileage displayed by the display unit in the image;

[0024] The calibration unit is used for calibrating road monitoring based on the standard time, the speed and the mileage.

[0025] Optionally, the mobile carrier has a carrying space, and when the display device includes a remote control unit, the remote control unit is disposed in the carrying space.

[0026] In the utility model, the above-mentioned display device is used to be installed on a mobile vehicle. The display device has standard time display function, speed display function and mileage display function, and displays the standard time and the speed and mileage of the mobile vehicle in real time, so that road monitoring can obtain time, speed and mileage in real time through images, and perform real-time system calibration based on the information obtained.

[0027] The utility model also forms a road monitoring calibration system based on the above display device. The system uses road monitoring to collect images of mobile vehicles equipped with display devices, and obtains the standard time, speed and mileage information displayed by the display device in the image, and compares it with the speed of the mobile vehicle measured by the road monitoring and its own time to achieve time and speed calibration. At the same time, each road monitoring can calculate the distance through the mileage data of the mobile vehicle obtained to achieve distance calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a road monitoring calibration system according to an embodiment of the utility model;

[0029] Figure 2 It is a schematic structural diagram of a display device according to an embodiment of the utility model;

[0030] Figure 3 A schematic structural diagram of a housing of a display device according to an embodiment of the utility model;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of a housing of a display device according to an embodiment of the utility model;

[0032] Figure 5 It is a schematic side view of the structure of the housing of a display device according to an embodiment of the utility model;

[0033] Figure 6 A schematic diagram of the installation structure of a housing of a display device according to an embodiment of the utility model;

[0034] Figure 7 This is a schematic diagram of the main cycle flow of a display unit according to an embodiment of the present utility model;

[0035] Figure 8 A schematic diagram of the operation flow of a satellite communication module according to an embodiment of the present utility model;

[0036] Fig. 9 A schematic diagram of the operation flow of a speed odometer according to an embodiment of the utility model;

[0037] Fig.10 A schematic diagram of a refresh process of a display screen according to an embodiment of the present utility model;

[0038] Fig.11 This is a schematic diagram of the operation flow of a remote control unit according to an embodiment of the present utility model;

[0039] Fig.12 Schematic diagram of a road monitoring calibration process according to an embodiment of the present invention.

[0040] The reference numerals are as follows:

[0041] 10- housing;

[0042] 11-screen installation port; 12-opening; 13-water retaining flange; 14-wire hole;

[0043] 20-Connecting bracket;

[0044] 21-connection body; 22-first connection terminal; 23-second connection terminal;

[0045] 30-shelves;

[0046] a-The moving direction of the vehicle. DETAILED DESCRIPTION

[0047] The display device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0048] As used in the present invention, the singular forms "one", "an", and "the" include plural objects, the term "or" is usually used to include the meaning of "and / or", the term "several" is usually used to include the meaning of "at least one", and the terms "at least two" or "a plurality" are usually used to include the meaning of "two or more". In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. In addition, as used in the present invention, "installed", "connected", "connected", and one element "set" on another element should be understood in a broad sense, usually only indicating that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the connection, coupling, cooperation or transmission between the two elements can be direct or indirect through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any orientation such as inside, outside, above, below or one side of another element, unless the content clearly indicates otherwise. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used relative to the exemplary embodiments as shown in the figures, with the upward or upper direction toward the top of the corresponding figure, and the downward or lower direction toward the bottom of the corresponding figure.

[0049] Road monitoring systems generally have functions such as time display and speed measurement. The accuracy of speed measurement and time display directly affects the effectiveness of road monitoring.

[0050] To ensure the accuracy of road monitoring, it is usually necessary to calibrate the road monitoring system regularly. The existing calibration method is usually to measure the speed manually in real time, compare it with the speed measurement result of road monitoring, and then calculate the result for manual calibration. Most of the vehicle-mounted speed measurement devices currently on the market are usually aimed at ordinary family cars, which cannot be directly used for the calibration of road monitoring systems.

[0051] Therefore, a display device and a road monitoring calibration system are needed. The display device is used to be installed on the outside of a mobile vehicle and display the standard time, speed and mileage of the mobile vehicle in real time, so that road monitoring can obtain the standard time, speed and mileage information in real time, and perform real-time system calibration based on the obtained information.

[0052] This embodiment provides a road monitoring calibration system, which can be used to calibrate speed, time and mileage information of road monitoring.

[0053] The principle of speed calibration is to calibrate the speed measurement of road monitoring by calculating the error between the actual speed of the mobile vehicle under test and the actual speed measured by road monitoring.

[0054] The principle of time calibration is to calibrate the time display of road monitoring by calculating the error between the obtained standard time and the time displayed by the road monitoring itself.

[0055] The calibration of mileage information is used to calibrate the distance between two road monitoring systems. The main principle is to calculate the distance between the two vehicles using the mileage information of the mobile vehicle obtained from the two road monitoring systems.

[0056] like Figure 1 As shown, the road monitoring calibration system includes an image acquisition unit, an image extraction unit, a calibration unit, a mobile vehicle and a display device;

[0057] The display device includes a display unit, which is arranged outside the mobile vehicle and is used to display the real-time speed, standard time and mileage information of the mobile vehicle;

[0058] The image acquisition unit is arranged on the road to acquire the image of the mobile vehicle;

[0059] The image extraction unit is used to locate the image of the mobile vehicle and extract the standard time, the speed and the mileage displayed by the display unit in the image;

[0060] The calibration unit is used for calibrating road monitoring based on the standard time, the speed and the mileage.

[0061] In this embodiment, the mobile vehicle is a motor vehicle, which is manually driven. The display device is installed on the motor vehicle, wherein the display unit is located outside the motor vehicle, and preferably the display unit is installed on the top of the motor vehicle, for example, on a shelf on the top of the motor vehicle, so as to facilitate the acquisition of images by road monitoring. When the motor vehicle drives into the area where the road monitoring is located, the motor vehicle is photographed by the image acquisition unit, and the image of the display unit installed on the top of the motor vehicle is synchronously acquired.

[0062] In this embodiment, the image acquisition unit uses a camera of road monitoring, and after the camera takes a picture, an image of the moving vehicle is acquired. The present invention takes a road monitoring with speed measurement display and time display functions as an example. That is, after the camera takes a picture, the image is automatically marked with the speed of the moving vehicle measured by the road monitoring when taking the picture and the time of the road monitoring itself. In other words, through the image acquisition unit, the speed and time measured by the road monitoring itself and the speed and standard time displayed by the display unit can be obtained at the same time.

[0063] In some alternative implementations, when the road monitoring only has the speed display function, only the speed calibration may be performed; when the road monitoring only has the time display function, only the time calibration may be performed; when the road monitoring has both the speed display and time display functions, both the speed and time calibration may be performed simultaneously.

[0064] In the existing road monitoring, the camera automatically performs image acquisition, and the motor vehicles in the road monitoring area are automatically imaged by the road monitoring. In order to save a large number of images, the road monitoring calibration system also includes a storage unit, wherein the storage unit is used to store the images collected by the image acquisition unit, and when the image of the mobile vehicle is collected, the image of the mobile vehicle is automatically stored in the storage unit. In addition, the storage unit can store the basic program design and data structure for implementing various functions of the utility model. For example, the information data such as the real-time speed, standard time and mileage obtained by identification are stored in the storage unit, and the database and module implementing the calibration method of the utility model can be stored in the storage unit. These software modules are usually executed by a processor. In a distributed environment, the software modules can be stored on multiple computer systems and executed by processors of multiple computer systems. The storage unit usually includes a memory subunit and a file storage unit. The memory subunit usually includes multiple memories, including a main random access memory (RAM) for storing instructions and data during program execution and a read-only memory (ROM) in which fixed instructions are stored. The file memory subunit provides permanent (non-volatile) storage for program and data files. The file storage unit may include a hard drive and associated removable media, a compact disk (CD) drive, an optical drive, a DVD, a solid-state memory, and / or other removable media. One or more of these drives may be located at a remote location on other connected computers at other sites connected to the controller. The module implementing the method of the present utility model may be stored by the file storage unit.

[0065] The image extraction unit has at least two functions, the first function of which is to locate the target image, which is the image of the mobile vehicle, and the second function is to extract data from the located target image, and the extracted data includes the standard time, speed and mileage displayed by the display unit. In this embodiment, the image extraction unit can use the image recognition module of the road monitoring, which is usually based on the license plate number for recognition. Before calibration, the license plate number of the mobile vehicle can be first input through the host computer, and the license plate number of the mobile vehicle is stored in the storage unit; the image extraction unit extracts the license plate number of each image by traversing the images in the storage unit, and compares it with the license plate number of the mobile vehicle one by one. If the comparison is successful, the image is located as the image of the mobile vehicle. After locating the image, the digital information in the image is identified, and the standard time, speed and mileage data are extracted. In this embodiment, the image recognition technology in the image extraction unit is relatively mature, and the extraction of the license plate number, time, speed and mileage information is all prior art, which will not be repeated here.

[0066] In addition, the image extraction unit is also used to determine whether the image of the mobile vehicle is recognized. It can make a judgment by comparing the license plate number extracted from the image with the license plate number of the mobile vehicle. If the comparison is unsuccessful, it means that the image of the mobile vehicle is not recognized, and a recalibration signal needs to be sent to the mobile vehicle.

[0067] The extraction unit is also used to determine whether the extracted standard time, speed and mileage information are valid. The validity can be determined by the image pixels and the pixels of the locally extracted digital information. If the clarity is lower than the threshold, it is considered invalid and a recalibration signal is sent to the mobile vehicle. In another alternative embodiment, the validity can also be determined by the error. For example, when the error between the extracted information and the information obtained by the road monitoring itself is too large, the extracted information is considered abnormal and needs to be retested.

[0068] The recalibration signal may be sent by the extraction unit itself or by the calibration unit. The recalibration signal may be sent to a communication device on the mobile vehicle or to a communication device on the display device (e.g., to a remote control unit of the display device) to notify the tester on the mobile vehicle to retest. In addition, when the image extraction is successful and the extracted information is valid, a calibration success signal may be sent to the mobile vehicle.

[0069] The calibration unit includes at least one processor, which may be a central processing unit (CPU), a microcontroller unit (MCU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0070] The at least one processor can communicate with a plurality of peripheral devices via the bus subsystem. These peripheral devices can include a storage unit, a user interface input device, a user interface output device, and a network interface.

[0071] The network interface provides an interface to an external network and / or other devices. The network interface includes one or more interfaces known in the art, such as LAN, WLAN, Bluetooth, other wired and wireless interfaces, and the like.

[0072] User interface input devices may be used to input the license plate number of the mobile vehicle, and may include keyboards, pointing devices such as mice, trackballs, touch pads or graphic tablets, scanners, foot pedals, joysticks, touch screens embedded in displays, audio input devices such as voice recognition systems, microphones, and other types of input devices. In general, the term "input device" is intended to include a variety of conventional and proprietary devices and methods for inputting information into the calibration unit.

[0073] The user interface output device can be used to display the collected standard time, speed and mileage data, and the user interface output device may include a display subsystem, a printer, a fax machine, or a non-visual display such as an audio output device. The display subsystem can be a flat panel device, such as a liquid crystal display (LCD), a light emitting diode (LED) display, a touch screen display, etc. The display subsystem can also provide a non-visual display, such as via an audio output device. In general, the term "output device" is intended to include various conventional and proprietary devices and methods for outputting information from the calibration unit to the user.

[0074] The bus subsystem provides a means for the various components and subsystems of the calibration unit to communicate with each other as intended. The various subsystems and components of the calibration unit do not have to be in the same physical location, but can be distributed at various locations within a distributed network. The bus subsystem can be a single bus or multiple buses can be set up based on the requirements.

[0075] The calibration unit described above is intended to be used as an example only to illustrate only one embodiment of the present invention. Due to the ever-changing nature of computers and networks, in other alternative embodiments, the calibration unit may also have certain differences from the configuration of the calibration unit described above, which will not be repeated here.

[0076] The calibration unit also serves as a controller for road monitoring, which is used to record the speed of the mobile vehicle measured by the road monitoring itself, calculate the speed error between the extracted speed and the measured speed, and calibrate the speed measurement function of the road monitoring based on the speed error. At the same time, the time error between the extracted standard time and the time measured by the road monitoring itself is calculated, and the time function of the road monitoring is calibrated based on the time error. In addition, the calibration units of multiple road monitoring can communicate with each other or share a calibration unit, and the distance between each road monitoring is calculated through the mileage information extracted by each road monitoring, so as to calibrate the distance information.

[0077] In addition, the speed error threshold and the time error threshold can be input through the user interface input device. If the speed error is greater than the speed error threshold, or the time error is greater than the time error threshold, the extracted speed and time are considered abnormal. At this time, a recalibration signal is sent to the mobile vehicle to notify the tester; the speed error threshold and the time error threshold can be set according to verification to eliminate abnormal information.

[0078] like Figure 2 As shown, in this embodiment, the display device includes: a display unit and a speed odometer; the display unit includes a shell, a display screen and a satellite communication module.

[0079] like Figures 3 to 6 As shown, the housing 10 is a rectangular parallelepiped structure, the housing material is a stainless steel plate, white matte spray paint, and shutters can be set on both sides of the housing along its length direction for heat dissipation. The outer dimensions of the housing are determined based on the content to be displayed and the installation method. For example, when the housing is installed on the shelf on the top of the mobile carrier, the length of the housing should be at least longer than the distance between the two shelves.

[0080] In this embodiment, the display screen of the display device is an LED digital tube display screen. In order to achieve a time display resolution of 0.1s and the refresh effect does not affect the imaging effect of the road monitoring system, the digital tube refresh rate is preferably lower than 0.1s.

[0081] In other alternative embodiments, the display screen may also be a liquid crystal display (LCD) or an organic light-emitting semiconductor display (OLED).

[0082] In this embodiment, the display screen has a time display area, a speed display area and a mileage display area.

[0083] like Figure 3 and Figure 4 As shown, in this embodiment, the front panel (first side wall) of the shell 10 is provided with two screen mounting openings 11, and the rear panel (second side wall) thereof is provided with an opening 12. The display unit also includes a cover body (not shown in the figure), and the cover body is sealed to cover the opening 12.

[0084] Please continue to refer to Figure 4 and Figure 5 As shown, the opening 12 is a rectangular structure, and the four sides of the opening have water-retaining flanges 13 folded outward, and the water-retaining flanges 13 form an angle with the rear panel of the housing 10, and the angle is preferably an acute angle. When the cover body is sealed on the opening 12, the cover body covers the outside of the water-retaining flange 13. A circle of sealing strips can be set on the cover body. When the cover body covers the opening, the sealing strip is sealed and fitted with the rear panel of the housing, and the sealing strip surrounds the water-retaining flange. In this embodiment, the cover body is installed on the housing by means of hinges and quick locks to realize the opening and closing of the cover body.

[0085] Of course, in other alternative embodiments, based on waterproof requirements, one or more sides of the opening may be selected to be provided with a waterproof flange.

[0086] The display unit includes two display screens, which are respectively installed in two screen installation openings 11. The front display area of ​​the display screen is located in the installation opening, and the back of the display screen is located inside the shell. The two display screens are divided into two areas, each of which has a white light seven-segment multi-character number composed of several lighting-level high-brightness LED digital tubes, with a character height of 95mm and a width of 45mm (similar to the size of the characters on the motor vehicle license plate); one of the display screens displays the real-time speed and mileage, and the display format is XXXXX.Xkm / h (speed) and XXXXXXm (mileage); the other display screen displays the standard time, with a display resolution of 0.1s and a display format of HH:MM:SS.s.

[0087] The opening 12 on the rear panel of the housing 10 is used for installing components in the housing. For example, a display screen is installed inside the housing through the opening, and the display side of the display screen is located in the screen installation opening. The surface of the internal circuit board of the display screen is coated with a three-proof paint, and the protection level is IP54; the operating temperature is -20℃~40℃;

[0088] The satellite communication module can be installed inside the housing 10 through the opening 11. The satellite communication module is connected to the display screen. The satellite communication module is used to receive the standard time, provide the standard time to the display screen, and display it in the time display area. The satellite communication module can be directly or indirectly connected to the display screen. In this embodiment, the satellite communication module is indirectly connected to the display screen through a remote control unit. The specific connection method is detailed in the following content about the remote control unit.

[0089] The data source of the satellite communication module is the Beidou satellite system and GPS dual-mode. The top of the shell is equipped with the Beidou satellite system and GPS receiving antenna for receiving standard time. The timing is updated once a second, with a time accuracy better than 1ms. It has a built-in constant temperature crystal oscillator, and the 12-hour deviation is less than 10ms.

[0090] The speed odometer is used to detect the speed and mileage of a mobile vehicle. The speed odometer uses existing equipment, such as an L350 speed odometer. The speed odometer is connected to the display screen. The speed odometer provides the speed and mileage to the display screen, and displays the speed in the speed display area and the mileage in the mileage display area. The speed odometer can be directly or indirectly connected to the display screen. In this embodiment, the speed odometer is indirectly connected to the display screen through a remote control unit. The specific connection method is detailed in the following content about the remote control unit.

[0091] In other alternative embodiments, the three display areas may be three independent physical areas, for example, each display area is formed by a display screen.

[0092] In other alternative embodiments, three display areas can be formed on a display screen by artificially dividing the areas.

[0093] In other alternative embodiments, different contents may also be displayed by switching the screen, and each screen switch forms a display area, that is, multiple display areas do not display contents at the same time.

[0094] In other alternative embodiments, more content may be displayed, such as ambient temperature.

[0095] The display device further comprises a remote control unit, the remote control unit having a remote control display area, the remote control display area being used to display the standard time, the speed and the mileage;

[0096] Specifically, the remote control unit has an LCD display screen, which displays the real-time speed, mileage and standard time synchronously with the external display unit of the vehicle.

[0097] The display unit and remote control unit are powered by DC 12V and can be directly powered by the battery of a motor vehicle.

[0098] The display unit is equipped with a corresponding in-vehicle remote control unit. In this embodiment, the mobile vehicle has a carrying space, and the remote control unit is arranged in the carrying space for remote control by the inspection personnel.

[0099] The remote control unit is connected to the speedometer via a coaxial cable. The remote control unit receives the pulse signal provided by the speedometer and obtains the real-time speed and accumulated mileage by calculating the pulse rate. The remote control unit is connected to the satellite communication module via a coaxial cable to obtain the standard time. The remote control unit is connected to the display unit via a network cable to provide the real-time speed, mileage, standard time and other data that need to be displayed.

[0100] The housing is provided with a wire hole 14 for passing the cable. In this embodiment, the end of the housing is provided with an antenna signal output interface (coaxial form), a DC power input interface and a data input interface (network cable form), and each interface is waterproof and dustproof.

[0101] The remote control unit is connected to the display unit and is used to initialize the data displayed on the display screen and / or adjust the brightness of the display screen.

[0102] like Figure 2 As shown, in some embodiments, the display device is equipped with a controller, which can be an MCU, a CPU, etc. Three buttons are provided on the remote control unit, which respectively realize the functions of clearing the accumulated mileage, switching the display content, and adjusting the brightness of the display screen. The individual buttons are connected to the controllers respectively. For example, the working current of the digital tube is controlled by the buttons to realize three-level adjustable display brightness to ensure that it can be recognized by the road monitoring system under different ambient brightness. For another example, the button is connected to the count clearing interface of the controller to realize the mileage clearing function. The display screen of the remote control unit is also connected to the controller.

[0103] In addition, the high-precision temperature-compensated crystal oscillator, satellite communication module, speedometer and display screen of the display unit are all connected to the controller, and the electrical connection or communication connection of each component is achieved through the controller.

[0104] Please continue to refer to Figure 6 As shown, the display unit also includes a connecting bracket 20, which includes a connecting body 21 and a first connecting terminal 22 and a second connecting terminal 23. The connecting body 23 is connected to the shell 10 of the display unit, and the first connecting terminal 22 and the second connecting terminal 23 are respectively connected to the two ends of the connecting body 21. The first connecting terminal 22 and the second connecting terminal 23 have different heights to adjust the display angle of the display unit.

[0105] The connecting bracket 20 is connected to the bottom (third side wall) of the housing.

[0106] like Figure 6 As shown, the first direction a corresponds to the length direction or the forward direction of the mobile vehicle, and the front panel of the housing 10 faces forward so that the display screen faces the forward direction. The installation direction of the housing 10 can be determined based on the road monitoring image acquisition direction. When the road monitoring captures the front of the motor vehicle, the front panel of the housing 10 faces forward so that the display screen faces the forward direction. When the road monitoring captures the rear of the motor vehicle, the front panel of the housing 10 faces backward so that the display screen faces the opposite direction of the forward direction.

[0107] Please continue to refer to Figure 6 As shown, the first connection terminal 22 and the second connection terminal 23 are similar to angle steel structures, and the overall shape of the connection bracket 20 is approximately in the shape of a "J". The first connection terminal 22 and the second connection terminal 23 are connected to the shelf 30 on the top of the mobile carrier, wherein the first connection terminal 22 is higher than the second connection terminal 23, and the first connection terminal 22 is located on the side of the forward direction of the mobile carrier, so that the display screen has an elevation angle α, which is convenient for shooting road monitoring. The elevation angle α is preferably 15°-30°.

[0108] It can be imagined that in order to facilitate the installation of the shell 10, at least two connecting brackets 20 are required in this embodiment. The two connecting brackets 20 are arranged along the length direction of the shell, and the two connecting brackets 20 are respectively connected to the two shelves on the top of the mobile carrier.

[0109] Each connection terminal can be connected to the shelf by means of screw connection, or a standard quick-release lock can be installed at the bottom of the connection bracket and connected to the shelf by means of a quick lock, which is convenient for loading and unloading.

[0110] In other alternative embodiments, the structure of the connecting bracket 20 may also be adaptively adjusted based on the matching mode with the mobile vehicle.

[0111] like Figure 7 As shown, it is the main loop flow chart when the display device is running. First, the system initialization of the display unit is performed, including initializing the display screen of the display unit, initializing the display screen of the remote control unit, initializing the satellite communication module, and then performing crystal oscillator training and data filtering and de-jittering to ensure the accuracy of time display.

[0112] like Figure 8 The figure shows the operation flow of the satellite communication module. After the satellite communication module is turned on, the standard time is received through the antenna. After the time is adjusted, the standard time is transmitted to the display screen of the display unit and displayed.

[0113] like Fig. 9The figure shows the operation flow chart of the speedometer. After the speedometer is turned on, the speedometer calculates the speed and accumulated mileage, and then transmits the real-time speed and mileage to the display screen of the display unit and displays them.

[0114] like Fig.10 The figure is a schematic diagram of the refresh process of the display screen. After the display screen of the display unit and the display screen of the remote control unit are displayed, the display screen is refreshed by millisecond timing, for example, 100ms.

[0115] like Fig.11 The figure shows the operation flow of the remote control unit, which uses three buttons to adjust brightness, clear mileage and switch displays.

[0116] To summarize, in the present invention, the above-mentioned display device is used to be installed on a mobile vehicle. The display device has standard time display function, speed display function and mileage display function, and displays the standard time and the speed and mileage of the mobile vehicle in real time, so as to facilitate road monitoring to obtain time, speed and mileage in real time, and perform real-time system calibration based on the information obtained.

[0117] The utility model also forms a road monitoring calibration system based on the above display device. The system uses road monitoring to collect images of mobile vehicles equipped with display devices, and obtains the standard time, speed and mileage information displayed by the display device in the image, and compares it with the speed of the mobile vehicle measured by the road monitoring and its own time to achieve time and speed calibration. At the same time, each road monitoring can calculate the distance between each other through the mileage data of the mobile vehicle obtained to achieve distance calibration.

[0118] like Fig.12 As shown, in this embodiment, a road monitoring calibration method is also provided, comprising the following steps:

[0119] S1: Install a display device on a mobile vehicle, wherein a display unit is installed on the outside of the mobile vehicle, and the display unit is preferably installed on a top shelf of the mobile vehicle to facilitate filming of road monitoring; a remote control unit is located inside the mobile vehicle.

[0120] S2: The mobile vehicle passes through the calibrated road monitoring area. The mobile vehicle may passively pass through the road monitoring area, for example, it may randomly drive to a road monitoring, and the road monitoring automatically calibrates after obtaining an image. Alternatively, the mobile vehicle may communicate with the road monitoring to determine the calibration time and pass through the road monitoring within the calibration time range, or the location of the mobile vehicle may be obtained in real time through location sharing to determine the time of passing through the road monitoring area.

[0121] S3: Road monitoring acquires the image of the mobile vehicle, and extracts the standard time, speed and mileage information displayed on the display device. Road monitoring acquires images through the image acquisition unit described above, and extracts images of the mobile vehicle through the image extraction unit. The acquisition of images by road monitoring belongs to the prior art. When the mobile vehicle passes through the road monitoring, the image is automatically acquired by the road monitoring, and the standard time, speed and mileage information in the image is extracted through image recognition. In this process, if the image of the mobile vehicle is not recognized, it is necessary to send a recalibration signal to the mobile vehicle so that the mobile vehicle passes through the road monitoring area again. In addition, when the image of the mobile vehicle is recognized, it is also necessary to determine whether the information in the image is valid. If it is invalid, it is necessary to send a recalibration signal to the mobile vehicle so that the mobile vehicle passes through the road monitoring area again.

[0122] The road monitoring to obtain the image of the mobile vehicle includes: the road monitoring obtains the images of all mobile vehicles in the area, and locates the image of the mobile vehicle equipped with the display device through the identification feature of the mobile vehicle. The identification feature is preferably a license plate number. In addition, the identification feature can also be a character feature marked on the display device, or a feature of a specific shape. In the image, after the corresponding identification feature is recognized through the image, the image is located as the image of the mobile vehicle equipped with the display device.

[0123] S4: Calibrate the road monitoring based on the extracted information. Specifically, the data calibration is performed by the calibration unit described above, which compares the extracted information with the road monitoring information itself, calculates the error, and implements data calibration based on the error.

[0124] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0125] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A display device, characterized in that: include: Display unit and speedometer; The display unit includes a display screen and a satellite communication module; The display screen has a time display area, a speed display area and a mileage display area; The satellite communication module is connected to the display screen; The speed odometer is connected to the display screen.

2. The display device according to claim 1, wherein: The display device also includes a remote control unit, which is directly connected to the satellite communication module, the speedometer and the display screen. The remote control unit has a remote control display area for displaying speed, mileage and standard time.

3. The display device according to claim 1, wherein: The display unit further includes a housing; At least a portion of the display screen is disposed outside the shell, and the satellite communication module is disposed inside the shell.

4. The display device according to claim 3, characterized in that The display unit also includes a connecting bracket, which includes a connecting body and a first connecting terminal and a second connecting terminal. The connecting body is connected to the shell, and the first connecting terminal and the second connecting terminal are respectively connected to two ends of the connecting body. The first connecting terminal and the second connecting terminal have different heights to adjust the display angle of the display unit.

5. The display device according to claim 3 or 4, characterized in that: The display unit further comprises a cover body. The housing is provided with an opening, and the cover body seals and covers the opening.

6. The display device according to claim 5, characterized in that The opening is formed on the first side wall of the housing, the display screen is mounted on the second side wall of the housing, and the first side wall and the second side wall are arranged opposite to each other; When the display unit includes a connecting bracket, the connecting bracket is connected to a third side wall of the housing, and the third side wall is adjacent to the first side wall and the second side wall.

7. The display device according to claim 5, characterized in that At least one side of the opening has a water-retaining flange bent outward.

8. The display device according to claim 3, wherein: The shell is provided with a wire hole for the wire to pass through.

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