A reversing image superposition device and a reversing auxiliary system

Abstract

The embodiment of the application provides a reverse image superposition device and a reverse auxiliary system, and belongs to the technical field of vehicle accessories. The reverse image superposition device comprises a video input processing unit, a synchronous signal separation unit, a first single-chip microcomputer and a video output processing unit, the line synchronous signal and the field synchronous signal are separated from the video signal through the synchronous signal separation unit, the level of the video signal superposition output is analyzed through the single-chip microcomputer, the image character superposition can be realized without using a special character superposition chip, the cost is reduced, and the compatibility is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle parts technology, and in particular to a reversing image overlay device and a reversing assistance system. Background Technology

[0002] Reversing radars primarily assist users with parking in three ways: digital display, graphic display, and image display. Digital display reversing radars detect the distance between the vehicle and obstacles, then display this distance digitally. Image display reversing radars simulate a bird's-eye view of the car, displaying different colored blocks on the central control screen when obstacles are detected. Image display reversing radars use installed cameras to transmit real-time images of the vehicle's surroundings to the central control screen, providing users with a reversing view.

[0003] Currently, reversing radars can overlay character information onto video images using image overlay technology, simplifying user operation of the device and displaying necessary information on the screen, thus meeting users' reversing needs to a certain extent. However, this image overlay relies on a dedicated OSD (On-Screen Display) chip, which is not only costly but also limited in image format, requiring the use of fixed-format CCD cameras. With the advancement of camera technology, mainstream cameras have replaced CCD cameras with AHD cameras, making OSD chips no longer suitable. Utility Model Content

[0004] The main objective of this application is to propose a reversing image overlay device and a reversing assistance system, which aims to achieve image character overlay without the need for a dedicated character overlay chip, thereby reducing costs and improving compatibility.

[0005] To achieve the above objectives, one embodiment of this application proposes a reversing image overlay device, including a video input processing unit, a synchronization signal separation unit, a first microcontroller, and a video output processing unit, wherein the first microcontroller includes a first input pin, a second input pin, and a first output pin;

[0006] The video input processing unit is connected to the video output processing unit and the synchronization separation unit respectively. The synchronization signal separation unit is connected to the first input pin, and the first output pin is connected to the video output processing unit.

[0007] The video input processing unit is used to receive video signals captured by the camera and send the video signals to the video output processing unit and the synchronization signal separation unit;

[0008] The synchronization signal separation unit is used to separate the horizontal synchronization signal and the vertical synchronization signal from the video signal, and send the horizontal synchronization signal and the vertical synchronization signal to the first input pin;

[0009] The second input pin is used to receive distance information between the vehicle and the obstacle;

[0010] The first microcontroller is used to generate a pin level based on the distance information, and to control the timing of the first output pin to output the pin level based on the line synchronization signal and the field synchronization signal;

[0011] The video output processing unit is used to receive the pin level and the video signal, and to superimpose the pin level and the video signal.

[0012] In some embodiments, the first microcontroller includes a data processing unit, a storage unit, and a character overlay unit;

[0013] The data processing unit is connected to the first input pin, the second input pin, the storage unit, and the character overlay unit, respectively, and the character overlay unit is connected to the first output pin;

[0014] The storage unit is used to store the character template library;

[0015] The data processing unit is used to receive and process distance information, generate character pattern data to be sent based on the distance information and the character pattern library, and control the timing of sending the character pattern data based on the field synchronization signal and the line synchronization signal.

[0016] The character overlay unit is used to control the first output pin to output the pin level according to the received character pattern data and the transmission timing.

[0017] In some embodiments, the first microcontroller further includes a vehicle model control information transmitting unit and a second output pin, the data processing unit is connected to the vehicle model control information transmitting unit, and the vehicle model control information transmitting unit is connected to the second output pin;

[0018] The data processing unit is also used to generate vehicle model control information based on the distance information, and send the vehicle model control information to the vehicle model control information transmitting unit;

[0019] The vehicle model control information transmitting unit is used to communicate with the external vehicle system processing module through the second output pin.

[0020] In some embodiments, the reversing image overlay device further includes a high-level active circuit, which includes a first resistor and a first diode;

[0021] The first output pin is connected to the first resistor, the anode of the first diode is connected to the first resistor, and the cathode of the first diode is connected to the video output processing unit.

[0022] The first diode is turned on when the pin level is high.

[0023] In some embodiments, the reversing image overlay device further includes a low-level active circuit, which includes a second resistor and a second diode;

[0024] The first output pin is connected to the second resistor, the cathode of the second diode is connected to the first resistor, and the anode of the second diode is connected to the video output processing unit.

[0025] The second diode is turned on when the pin level is low.

[0026] To achieve the above objectives, another aspect of this application proposes a reversing assistance system including a second microcontroller, a ranging module, a display screen, and the aforementioned reversing image overlay device;

[0027] The second microcontroller is connected to both the ranging module and the reversing image overlay device, and the reversing image overlay device is connected to the display screen.

[0028] The ranging module is used to detect the distance information between the vehicle and obstacles;

[0029] The second microcontroller is used to receive the distance information and send the distance information to the reversing image overlay device;

[0030] The display screen is used to display the video signal after the pin level is superimposed.

[0031] In some embodiments, the reversing assist system further includes a speaker connected to the second microcontroller, which controls the speaker to play an alarm sound based on the distance information.

[0032] In some embodiments, the reversing assistance system further includes a vehicle infotainment module, which is connected to the display screen and the first microcontroller respectively;

[0033] The first microcontroller is used to send vehicle model control information to the vehicle processing module;

[0034] The vehicle-mounted processing module is used to receive the vehicle model control information and send the vehicle model control information to the display screen for superposition with the video signal after superimposing the pin level.

[0035] The embodiments of this application include at least the following beneficial effects: This application provides a reversing image overlay device and a reversing assistance system. The reversing image overlay device includes a video input processing unit, a synchronization signal separation unit, a first microcontroller, and a video output processing unit. The synchronization signal separation unit separates the horizontal synchronization signal and the vertical synchronization signal from the video signal. After the microcontroller analyzes and outputs the level superimposed on the video signal, it can achieve image character overlay without the need for a dedicated character overlay chip, thereby reducing costs and improving compatibility. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the reversing image overlay device provided in the embodiments of this application;

[0037] Figure 2 This is a flowchart of video signal separation provided in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram illustrating the effect of video image overlay provided in the embodiments of this application;

[0039] Figure 4 This is a schematic diagram of the reversing assistance system provided in this application;

[0040] Figure 5 This is a schematic diagram of the reversing assistance system provided in another embodiment of this application;

[0041] Figure 6 This is a circuit diagram of the reversing image overlay device provided in the embodiments of this application. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, the use of terms such as "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0045] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0046] Before providing a detailed description of the embodiments of this application, some related technologies involved in the embodiments of this application will be described first.

[0047] (1) On-Screen Display (OSD): Originating in the consumer electronics industry in the 1980s, OSD was primarily designed to provide user interface interaction functions on televisions or other display devices. Its initial purpose was to simplify user operation of the device by displaying necessary function menus, information prompts, etc., directly on the screen without relying on other display devices.

[0048] (2)EXT I: is a hardware module inside the microcontroller used to manage external input signals. It is mainly used to handle interrupt requests or event triggers from chip pins or other peripherals.

[0049] The following is for reference. Figure 1 This utility model embodiment proposes a reversing image overlay device, including a video input processing unit, a synchronization signal separation unit, a first microcontroller, and a video output processing unit, wherein the first microcontroller includes a first input pin, a second input pin, and a first output pin.

[0050] The video input processing unit is connected to the video output processing unit and the synchronization separation unit respectively. The synchronization signal separation unit is connected to the first input pin and the first output pin is connected to the video output processing unit.

[0051] The video input processing unit is used to receive video signals captured by the camera and send the video signals to the video output processing unit and the synchronization signal separation unit.

[0052] The synchronization signal separation unit is used to separate the horizontal synchronization signal and the vertical synchronization signal from the video signal and send the horizontal synchronization signal and the vertical synchronization signal to the first input pin.

[0053] The second input pin is used to receive distance information between the vehicle and the obstacle.

[0054] The first microcontroller is used to generate pin levels based on distance information and control the timing of sending the output pin levels of the first output pin according to the horizontal synchronization signal and the vertical synchronization signal.

[0055] The video output processing unit is used to receive pin levels and video signals, and to superimpose the pin levels and video signals.

[0056] In this embodiment, the core of the reversing image overlay device is that it does not require the use of a dedicated character overlay chip. It only requires a microcontroller with external interrupt EXTI function and control pin high and low level function to realize the overlay function of video signal and character information.

[0057] Specifically, the video input processing unit is used to receive video signals captured by the camera. The input interface of this unit is connected to the output end of the camera, receives the original video signal, and splits the video signal into two outputs. One output is directly transmitted to the video output processing unit, and the other output is transmitted to the synchronization signal separation unit for video signal separation and detection.

[0058] The synchronization signal separation unit is connected to the output of the video input processing unit. This unit consists of peripheral circuitry that filters the video signal, leaving only the synchronization signal. The synchronization signal is divided into horizontal synchronization and vertical synchronization. The separated horizontal and vertical synchronization signals are each transmitted to the first input pin of the first microcontroller via signal lines.

[0059] The first microcontroller is the core control unit of the entire reversing image overlay device. It has the following three key function pins: the first input pin, the second input pin, and the first output pin.

[0060] The first input pin is used to receive the horizontal synchronization (HSYNC) signal and the vertical synchronization (VSYNC) signal output by the synchronization signal separation unit. This pin is configured to external interrupt mode to realize the real-time reception of the synchronization signal through external interrupt, so that the first microcontroller can capture the time and number of times the synchronization signal enters.

[0061] It is understandable that there are timing differences between the horizontal and vertical sync signals in a video signal. Therefore, the first microcontroller can distinguish whether the separated sync signal is a vertical sync signal or a horizontal sync signal based on the differences between the horizontal and vertical sync signals. Different video signal formats will have different separated vertical sync signals and horizontal sync signals, such as... Figure 2 As shown, the video signal format can be determined by the captured field synchronization signal and line synchronization signal.

[0062] When the synchronization signal is a line synchronization signal, the microcontroller records the number of times the line synchronization signal is triggered by a counter to determine whether the specified line has been reached. After finding the line synchronization signal of the specified line, the microcontroller uses this moment as the timing to control the output pin level of the first output pin.

[0063] By separating and analyzing the synchronization signal, the microcontroller can be compatible with different video formats (such as CCD / AHD720P / AHD1080P, etc.) to achieve the overlay of characters and patterns at the required positions.

[0064] The second input pin is used to receive distance information between the vehicle and the obstacle, which can be detected by a module with ranging function.

[0065] The first output pin is used to output the pin level superimposed on the video signal. The change in the pin level can directly affect the final display effect of the video signal.

[0066] The video output processing unit receives the video signal from the video input processing unit and the pin level output by the first microcontroller through the first output pin.

[0067] It should be noted that when the pin level is high, the video signal displayed on the screen is white, such as... Figure 3 As shown in “<<<0.04m>” and “<1.3m>”, or, when the pin level is low, the video signal is displayed as black on the screen. Using this principle, images can be directly superimposed on the video image.

[0068] In some embodiments, the first microcontroller includes a data processing unit, a storage unit, and a character overlay unit.

[0069] The data processing unit is connected to the first input pin, the second input pin, the storage unit, and the character overlay unit, respectively. The character overlay unit is connected to the first output pin.

[0070] The storage unit is used to store the font library.

[0071] The data processing unit is used to receive and process distance information, generate character data to be sent based on the distance information and the character library, and control the timing of sending the character data based on the field synchronization signal and the line synchronization signal.

[0072] The character overlay unit is used to control the output pin level of the first output pin according to the received character pattern data and the timing of transmission.

[0073] In this embodiment, the first microcontroller integrates three functional modules: a data processing unit, a storage unit, and a character overlay unit. The data processing unit is connected to the first input pin and captures the interrupt request of the synchronization signal.

[0074] Optionally, the storage unit uses on-chip Flash to store a pre-contained character matrix library including numbers, symbols and graphics. Each character matrix data is stored in the library according to a unified format encoding. The essence of the character matrix data is a binary matrix (e.g., an 8x8 dot matrix), where each bit corresponds to the level state of the first output pin, for example, "1" represents a high level and "0" represents a low level.

[0075] In other embodiments, the storage unit may also employ extended memory to store the character set library, with the first microcontroller connected to the extended memory via a parallel or serial interface. Parallel memory is one of the most common methods for expanding the external memory of a microcontroller. It is connected to the microcontroller in parallel via address and data lines. Common parallel memories include SRAM and DRAM. SRAM has fast data read / write capabilities, while DRAM has a larger storage capacity.

[0076] In other embodiments, the storage unit may also use a serial memory to store the character library. Serial memory is another common method for expanding the external memory of a microcontroller. It is connected to the microcontroller through a serial interface (such as SPI or I2C). Serial memory typically includes Flash and EEPROM.

[0077] The data processing unit is connected to the second input pin to retrieve the corresponding character pattern data from the storage unit based on the received distance information. The data processing unit controls the transmission timing by monitoring the field synchronization signal and line synchronization signal of the first input pin, transmitting the character pattern data to be transmitted to the character overlay unit.

[0078] After receiving the character pattern data transmitted during transmission, the character overlay unit outputs high and low levels on its pins according to the character pattern data.

[0079] In some embodiments, the first microcontroller further includes a vehicle model control information transmitting unit and a second output pin, the data processing unit is connected to the vehicle model control information transmitting unit, and the vehicle model control information transmitting unit is connected to the second output pin.

[0080] The data processing unit is also used to generate vehicle model control information based on distance information and send the vehicle model control information to the vehicle model control information transmitting unit.

[0081] The vehicle model control information transmission unit is used to communicate with the external vehicle system processing module through the second output pin.

[0082] In this embodiment, refer to Figure 4 The first microcontroller also includes a vehicle model control information transmitting unit and a second output pin. The data processing unit is connected to the vehicle model control information transmitting unit. The data processing unit receives and processes distance information and generates vehicle model control information based on the distance information. The vehicle model control information transmitting unit is connected to the second output pin and sends the processed vehicle model control information to the vehicle processing module outside the reversing image overlay device through USART (USART stands for Universal Synchronous / Asynchronous Serial Receiver / Transmitter, used for communication).

[0083] In some embodiments, the reversing image overlay device further includes a high-level active circuit, which includes a first resistor and a first diode.

[0084] The first output pin is connected to the first resistor, the anode of the first diode is connected to the first resistor, and the cathode of the first diode is connected to the video output processing unit.

[0085] The first diode conducts when the pin level is high.

[0086] In this embodiment, the validity of the level directly determines the color representation of the overlaid content. By setting a high-level valid circuit in the reversing image overlay device, the video signal is allowed to be pulled to white by the high level of the pin, avoiding the video signal being pulled to black by the low level of the pin, which would obscure the valid part of the video.

[0087] Specifically, the high-level active circuit includes a first resistor and a first diode, wherein one end of the first resistor is connected to the first output pin, the other end of the first resistor is connected to the positive terminal of the first diode, and the negative terminal of the first diode is connected to the video output processing unit.

[0088] Optionally, the first diode can be a silicon diode, and the appropriate resistance value of the first resistor is calculated based on the output current capability of the first output pin and the current required by the diode. When the pin level output by the first output pin is high, the first diode is forward-biased, and the video signal is affected by the high level, thus forming white pixels on the final image. When the pin level output by the first output pin is low, the first diode is in reverse-biased cutoff, and the final displayed image is entirely determined by the original video signal.

[0089] In some embodiments, the reversing image overlay device further includes a low-level active circuit, which includes a second resistor and a second diode.

[0090] The first output pin is connected to the second resistor, the cathode of the second diode is connected to the first resistor, and the anode of the second diode is connected to the video output processing unit.

[0091] The second diode conducts when the pin level is low.

[0092] In this embodiment, by setting a low-level active circuit in the reversing image overlay device, the video signal is allowed to be pulled to black by the low level of the pin, and the video signal is prevented from being pulled to white by the high level of the pin.

[0093] Specifically, the low-level active circuit includes a second resistor and a second diode, wherein one end of the second resistor is connected to the first output pin, the other end is connected to the negative terminal of the second diode, and the positive terminal of the second diode is connected to the video output processing unit.

[0094] When the first output pin outputs a low level, the second diode conducts, and the video signal is affected by the low level, resulting in black pixels on the final image. When the first output pin outputs a high level, the second diode is cut off, and the final displayed image is entirely determined by the original video signal.

[0095] Reference Figure 5 This utility model embodiment also provides a reversing assistance system, including a second microcontroller, a ranging module, a display screen, and the aforementioned reversing image overlay device.

[0096] The second microcontroller is connected to the ranging module and the reversing image overlay device, and the reversing image overlay device is connected to the display screen.

[0097] The ranging module is used to detect the distance information between the vehicle and obstacles.

[0098] The second microcontroller is used to receive distance information and send it to the reversing image overlay device.

[0099] The display screen is used to show the video signal after the pin levels are superimposed.

[0100] In this embodiment, the reversing assistance system uses a second microcontroller, a distance measuring module, a display screen, and a reversing image overlay device to achieve the function of overlaying distance information characters onto video images.

[0101] Specifically, the ranging module can select sensors such as ultrasonic, laser, and infrared to directly measure the distance information between the vehicle and obstacles, depending on different scenarios and needs, or estimate the distance information by deploying a deep learning model within the ranging module.

[0102] For example, an ultrasonic sensor is installed on a vehicle to calculate the distance by measuring the time difference between the ultrasonic wave emission and the echo reception.

[0103] The second microcontroller is connected to both the ranging module and the reversing image overlay device. It is used to receive distance information from the ranging module and send the distance information to the reversing image overlay device to overlay the distance information with the original video signal.

[0104] The processed video signal is transmitted to the display screen, which displays the reversing image with distance information in real time.

[0105] In some embodiments, the reversing assist system further includes a speaker connected to a second microcontroller, which controls the speaker to play an alarm sound based on distance information.

[0106] In this embodiment, to enhance the warning effect of reversing, the reversing assistance system also includes a speaker, providing dual visual and auditory warnings to assist the user in reversing. Considering that the user may not be looking at the display screen (e.g., turning their head to look to the side), the second microcontroller can transmit a command to control the speaker to play a specific alarm sound when the vehicle is within a specific range of obstacles, based on distance information.

[0107] For example, at a distance of 1.5m to 0.5m, the speaker intermittently emits a "beep" sound to remind the user to pay attention to the reversing distance; at a close distance of 0.5m to 0.2m, the speaker emits a continuous "beep" sound to remind the user that emergency braking is required; at the extreme distance of less than 0.2m, the speaker sounds a continuous beep to remind the user to avoid a collision.

[0108] It is understood that the grading of the distance range for triggering the speaker and the distance threshold are merely exemplary and can be set according to the scenario and requirements. This application embodiment does not impose any specific limitations.

[0109] Optionally, in other embodiments, the reversing assist system further includes a speaker connected to a first microcontroller. The first microcontroller controls the speaker to play an alarm sound based on distance information. The method by which the first microcontroller controls the speaker is the same as that of the second microcontroller, and will not be described again here.

[0110] In some embodiments, the reversing assistance system further includes a vehicle infotainment module, which is connected to the display screen and the first microcontroller.

[0111] The first microcontroller is used to send vehicle model control information to the vehicle processing module.

[0112] The vehicle-mounted processing module is used to receive vehicle model control information and send the vehicle model control information to the display screen for superposition with the video signal after superimposing the pin level.

[0113] In this embodiment, refer to Figure 4 The reversing assistance system also includes a vehicle-mounted processing module. One end of the vehicle-mounted processing module is connected to the first microcontroller to receive vehicle-mounted control information sent by the vehicle-mounted control information generation unit. After receiving the vehicle-mounted control information, the vehicle-mounted processing module is connected to the display screen through the other end. The vehicle-mounted model on the video image after superimposing the image dynamically changes according to the actual distance and orientation of the obstacle and is then displayed on the display screen.

[0114] The following is a detailed description and explanation of the embodiments of this utility model, with reference to specific application examples.

[0115] Currently, Android large-screen reversing radars only display the distance using a car model graphic, not a numerical display. This makes distance assessment unclear. For example, the car model graphic is already fully charged at 0.4m, making it indistinguishable from 0.1m. However, some users want to reverse to 0.2m before stopping. At this point, due to the lack of distance display in the car model graphic, users cannot control the distance, which can easily lead to collisions.

[0116] While visual reversing radar can provide a reversing view, it requires an additional display, increasing costs. Moreover, the mainstream cameras are now in AHD format. If a dedicated character overlay chip is used, it is not only expensive but also limited by the image format, only allowing the use of fixed-format CCD cameras. If the vehicle already has an AHD camera, users are unwilling to replace it with a CCD camera.

[0117] While digital display radar offers both the intuitiveness of a car model graphic and the precision of digital distance, it lacks a reversing camera and cannot observe the situation directly behind the vehicle. If there is an obstacle in the radar blind spot, the lack of a reversing camera can easily lead to a collision.

[0118] Therefore, the reversing assistance system of this application uses a reversing image overlay device based on a microcontroller to realize OSD, and uses custom pre-stored character pattern data to control the timing and position of the high and low level output of the microcontroller pins, so as to overlay the desired graphic on the video.

[0119] Specifically, the circuit diagram of the reversing image overlay device is as follows: Figure 6 As shown, the first microcontroller U8 has 16 pins, of which pin 1 is the first input pin, pin 5 is the first output pin, pin 9 is used to output car model control information, pin 10 is used to receive data from the second microcontroller, and pin 11 is used to connect to the buzzer.

[0120] The first microcontroller uses a first resistor R56 and a first diode D5 to input the voltage level of its first input pin into the video signal. Since the circuit formed by the first resistor R56 and the first diode D5 is a high-level active circuit, only when a high voltage level is input into the video signal will the video signal appear white. The timing and duration of the high voltage level can be controlled to overlay a desired pattern onto the video signal, such as... Figure 3 As shown.

[0121] Reference Figure 4 The reversing assist system detects distance information through ultrasonic sensors (also known as probes). The second microcontroller receives the distance information transmitted by the probes. If the distance information indicates that the vehicle is within a specific range from the obstacle, the system transmits the information to the speaker to play a specific alarm sound. After receiving the command, the speaker plays a preset alarm sound to remind the user.

[0122] During the character overlay process of the reversing image, the reversing assistance system sends distance information to the first microcontroller through the second microcontroller. The data processing unit in the first microcontroller receives and processes the distance information, and generates a data matrix to be sent based on the distance information and the character template library in the storage unit, thus obtaining the character template data to be sent.

[0123] Meanwhile, the video signal captured by the camera is separated into line synchronization signal and field synchronization signal by the synchronization signal separation unit, which are used to determine the start and end of the video frame.

[0124] Specifically, the first microcontroller separates the field synchronization signal and the line synchronization signal in the video signal by timing. It determines the format and resolution by detecting the field synchronization in the video signal, and determines the character overlay position by detecting the line synchronization in the video signal.

[0125] The first microcontroller uses the data processing unit to find the specified line based on the received line synchronization signal, and controls the timing of transmission to send the specific character pattern data to the character overlay unit, thereby controlling the pin level output by the first output pin.

[0126] The video output processing unit connects the pin level to the video signal to process the video signal, so that the video signal is affected by the pin level to achieve the character overlay effect.

[0127] Furthermore, the first microcontroller communicates with the vehicle processing module through the vehicle model control information generation unit. After receiving the vehicle model control signal, the vehicle processing module dynamically changes the vehicle model on the image according to the actual distance and orientation of the obstacle.

[0128] Understandably, besides using ultrasonic sensors to detect distance information and superimposing it onto the video image, temperature and humidity sensors can be added and connected to the second microcontroller to detect environmental information such as temperature and humidity, and to correct the data transmitted from the ultrasonic sensors using temperature sensor data. The first microcontroller then retrieves the corresponding character pattern data and superimposes it onto the video signal to achieve a character overlay effect and display more information.

[0129] In summary, the reversing image overlay device and reversing assistance system provided in this application are implemented using only a microcontroller, which can replace a dedicated character chip and significantly reduce costs. Furthermore, it is compatible with CCD cameras and multiple video formats such as AHD 720P and AHD 1080P, enhancing the device's compatibility and eliminating the need for additional cameras and screens, further reducing costs. In addition, the reversing assistance system product provided in this application combines the intuitiveness of graphics with the precision of numbers, providing users with a more diverse interface and a better visual experience when reversing.

[0130] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A reversing image overlay device, characterized in that, It includes a video input processing unit, a synchronization signal separation unit, a first microcontroller, and a video output processing unit, wherein the first microcontroller includes a first input pin, a second input pin, and a first output pin; The video input processing unit is connected to the video output processing unit and the synchronization signal separation unit respectively. The synchronization signal separation unit is connected to the first input pin, and the first output pin is connected to the video output processing unit. The video input processing unit is used to receive video signals captured by the camera and send the video signals to the video output processing unit and the synchronization signal separation unit; The synchronization signal separation unit is used to separate the horizontal synchronization signal and the vertical synchronization signal from the video signal, and send the horizontal synchronization signal and the vertical synchronization signal to the first input pin; The second input pin is used to receive distance information between the vehicle and the obstacle; The first microcontroller is used to generate a pin level based on the distance information, and to control the timing of the first output pin to output the pin level based on the line synchronization signal and the field synchronization signal; The video output processing unit is used to receive the pin level and the video signal, and to superimpose the pin level and the video signal.

2. The reversing image overlay device according to claim 1, characterized in that, The first microcontroller includes a data processing unit, a storage unit, and a character overlay unit; The data processing unit is connected to the first input pin, the second input pin, the storage unit, and the character overlay unit, respectively, and the character overlay unit is connected to the first output pin; The storage unit is used to store the character template library; The data processing unit is used to receive and process distance information, generate character pattern data to be sent based on the distance information and the character pattern library, and control the timing of sending the character pattern data based on the field synchronization signal and the line synchronization signal. The character overlay unit is used to control the first output pin to output the pin level according to the received character pattern data and the transmission timing.

3. The reversing image overlay device according to claim 2, characterized in that, The first microcontroller also includes a vehicle model control information transmitting unit and a second output pin. The data processing unit is connected to the vehicle model control information transmitting unit, and the vehicle model control information transmitting unit is connected to the second output pin. The data processing unit is also used to generate vehicle model control information based on the distance information, and send the vehicle model control information to the vehicle model control information transmitting unit; The vehicle model control information transmitting unit is used to communicate with the external vehicle system processing module through the second output pin.

4. The reversing image overlay device according to claim 1, characterized in that, The reversing image overlay device also includes a high-level active circuit, which includes a first resistor and a first diode. The first output pin is connected to the first resistor, the anode of the first diode is connected to the first resistor, and the cathode of the first diode is connected to the video output processing unit. The first diode is turned on when the pin level is high.

5. The reversing image overlay device according to claim 4, characterized in that, The reversing image overlay device also includes a low-level active circuit, which includes a second resistor and a second diode. The first output pin is connected to the second resistor, the cathode of the second diode is connected to the first resistor, and the anode of the second diode is connected to the video output processing unit. The second diode is turned on when the pin level is low.

6. A reversing assist system, characterized in that, Includes a second microcontroller, a ranging module, a display screen, and a reversing image overlay device as described in any one of claims 1 to 5; The second microcontroller is connected to both the ranging module and the reversing image overlay device, and the reversing image overlay device is connected to the display screen. The ranging module is used to detect the distance information between the vehicle and obstacles; The second microcontroller is used to receive the distance information and send the distance information to the reversing image overlay device; The display screen is used to display the video signal after the pin level is superimposed.

7. The reversing assist system according to claim 6, characterized in that, The reversing assist system also includes a speaker, which is connected to the second microcontroller. The second microcontroller is used to control the speaker to play an alarm sound based on the distance information.

8. The reversing assist system according to claim 6, characterized in that, The reversing assistance system also includes a vehicle infotainment module, which is connected to the display screen and the first microcontroller respectively. The first microcontroller is used to send vehicle model control information to the vehicle processing module; The vehicle-mounted processing module is used to receive the vehicle model control information and send the vehicle model control information to the display screen for superposition with the video signal after superimposing the pin level.

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