CN213384056U

CN213384056U - Low-delay motor vehicle indirect visual field device based on FPGA

Info

Publication number: CN213384056U
Application number: CN202022119126.4U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenzhen Iwaysense Intelligent Co ltd
Current assignee: Shenzhen Iwaysense Intelligent Co ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-06-08
Anticipated expiration: 2030-09-24

Abstract

The utility model discloses a low-delay motor vehicle indirect visual field device based on FPGA, which belongs to a motor vehicle auxiliary visual field device, comprising a camera arranged outside the motor vehicle, wherein the camera is connected with an FPGA module, the FPGA module is also respectively connected with a video module and a display screen, and is used for collecting images by the camera and transmitting the images to the FPGA module, and the images are respectively transmitted to the video module and the display screen after being processed by the FPGA module; the display screen is intended to be mounted inside the cab of a motor vehicle. The camera is used for collecting images of the designated area and transmitting the images to the FPGA module for video recording and real-time display, and the camera is arranged outside the motor vehicle, so that the condition that objects and passengers in the vehicle block a view area can be avoided, and the influence caused by rainwater and fog can be reduced; and by utilizing the characteristics of the FPGA chip, the time sequence synchronization of the image transmission and the display can be deeply adapted, the point-to-point transmission is realized, the time delay index of the image display is effectively reduced, and the image rate basically same as that of the glass reflection device is realized.

Description

Low-delay motor vehicle indirect visual field device based on FPGA

Technical Field

The utility model relates to a field of vision device is assisted to motor vehicle, more specifically the utility model relates to a low time delay motor vehicle indirect field of vision device based on FPGA.

Background

At present, the common visual field auxiliary devices on motor vehicles are glass reflecting devices, such as interior rearview mirrors and exterior rearview mirrors, the blind area of the glass reflecting devices is large, and the interior rearview mirrors can be shielded by passengers in a rear seat and placed objects in front of a rear windshield as well as a B column and a C column; and the outside rear-view mirror is different according to the size and the angle of speculum surface and the high width of car, generally can accomplish 20 degrees to the observation angle of 40 degrees of level, about 10 degrees perpendicularly, and the side direction is still very big to the blind area, loses its original backsight function because expose the reason such as receiving rainwater or door window fog easily outside simultaneously. The indirect visual field device is the inevitable trend that present motor vehicle tradition glass reflector electronization was substituted, and the indirect visual field device of motor vehicle can expand visual scope, and the blind area is little, can show the visibility that improves under the adverse weather simultaneously, has very big practicality, and international mainstream car factory has all begun to adopt, and corresponding law and regulation is also in progressively perfecting.

At present, the mainstream motor vehicle indirect visual field device is realized by pushing a display screen by adopting an SoC chip and an external camera, certain time consumption is inevitably caused by SoC design and operation system memory management and carrying, certain time delay can be generated when the time consumption of each link is accumulated, and generally the time delay of the design is actually measured and is generally more than 100 milliseconds. The design of the indirect vision device of the motor vehicle is compared with a glass reflector, and based on the basic assumption that the current light speed is the largest, the imaging system of the indirect vision device of the motor vehicle can never be compared with an optical reflection inside and outside rearview mirror. Because the processing speed of these processes is mostly less than the speed of light because of the imaging of the indirect-view device of the motor vehicle onto the display system, the processing speed of the whole system must be lower than the speed of light reflection of the glass mirror. Therefore, the lower the delay of the image, the closer the image is to the traditional glass reflector, the better the driving safety of the system can be ensured. Currently, similar products in the mainstream market generally measure delay time exceeding 100 milliseconds. Assuming that the vehicle runs at a high speed of 120 kilometers per hour according to the highest speed limit of 120km/h of a domestic expressway, the advancing mileage per millisecond is as follows:

120 (km) × 1000 (m) ÷ 60 (min) ÷ 60 (sec) ÷ 1000 (ms) ≈ 0.03 m

100 milliseconds, the mileage over which the vehicle advances is 0.03 × 100 = 3 meters. That is, when the driver views an image 3 meters ahead of the screen, that is, when the driver views the image, the vehicle has already advanced 3 meters, and the image observed by the driver is later than the actual image, which is likely to cause a misjudgment to the driver and a traffic accident. There is therefore a need for further research and improvement in view aids on motor vehicles.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model is to above-mentioned not enough, provide an indirect field of vision device of low time delay motor vehicle based on FPGA to it is great to expect to solve among the prior art glass reflecting device's blind area of back vision, is sheltered from easily, and receives rainwater and the technical problem such as influence this rearview function of fogging easily.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a low time delay motor vehicle indirect visual field device based on FPGA, including being used for installing the camera in the motor vehicle outside, the camera inserts the FPGA module, the FPGA module still inserts video recording module and display screen respectively, is used for gathering the image and transmitting to the FPGA module by the camera, transmits to video recording module and display screen respectively after being handled by the FPGA module; the display screen is used for being installed inside a cab of a motor vehicle.

Preferably, the further technical scheme is as follows: the camera is connected to a parallel device in the FPGA module through a serializer, and the parallel device is connected to an FPGA chip in the FPGA module.

The further technical scheme is as follows: the FPGA chip is connected to the video module through a video interface and a playback interface respectively.

The further technical scheme is as follows: the FPGA module is also provided with a key, and the key is connected to an FPGA chip in the FPGA module.

Compared with the prior art, one of the beneficial effects of the utility model is that: the camera is used for collecting images of the designated area and transmitting the images to the FPGA module for video recording and real-time display, and the camera is arranged outside the motor vehicle, so that the condition that objects and passengers in the vehicle block a view area can be avoided, and the influence caused by rainwater and fog can be reduced; and utilize the characteristic of FPGA chip, but degree of depth adaptation image biography is synchronous with the chronogenesis of display, and point-to-point transmission effectively reduces image display's time delay index, realizes the image rate the same basically with glass reflect meter, simultaneously the utility model provides a low time delay motor vehicle indirect field of vision device based on FPGA simple structure is suitable for and installs and use on all kinds of motor vehicles, and the range of application is wide.

Drawings

Fig. 1 is a schematic structural diagram for explaining an embodiment of the present invention;

FIG. 2 is a flow chart for explaining the image processing according to an embodiment of the present invention;

FIG. 3 is a software logic flow diagram for illustrating one embodiment of the present invention;

in the figure, 1 is a camera, 2 is an FPGA module, 3 is a video module, 4 is a display screen, 5 is a parallelizer, 6 is a serializer, and 7 is a key.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention is a low-delay indirect visual field device for a motor vehicle based on FPGA, which includes a camera 1 for being installed outside the motor vehicle, wherein the camera 1 is connected to a FPGA module 2, the FPGA is a field programmable gate array chip module, the FPGA module 2 is further connected to a video module 3 and a display screen 4 respectively, and is used for collecting images by the camera 1 and transmitting the images to the FPGA module 2, and the images are transmitted to the video module 3 and the display screen 4 respectively after being processed by the FPGA module 2; the aforementioned display screen 4 is intended to be mounted inside the cab of a motor vehicle. Preferably, as shown in fig. 1, the aforementioned camera 1 is connected to the parallelizer 5 in the FPGA module 2 through the serializer 6, the serializer 6 and the parallelizer 5 are electrically connected through a coaxial cable, and the parallelizer 5 is connected to the FPGA chip 21 in the FPGA module 2. Meanwhile, the FPGA chip 21 is respectively connected to the video module 3 through a video interface and a playback interface.

In the embodiment, the camera 1 is used for collecting the image of the designated area and transmitting the image to the FPGA module for video recording and real-time display, and the camera 1 is arranged outside the motor vehicle, so that the condition that articles and passengers in the vehicle block a view area can be avoided, and the influence caused by rainwater and fogging can be reduced; and by utilizing the characteristics of the FPGA chip 2, the time sequence synchronization of image transmission and a display can be deeply adapted, point-to-point transmission is realized, the time delay index of image display is effectively reduced, and the image rate basically identical to that of a glass reflecting device is realized.

For convenience of control, the FPGA module 2 may be further provided with a key 7, the key 7 is connected to the FPGA chip 21 inside the FPGA module 2, and the user can select a function through the key 7.

Based on the visual field device described in the above embodiment, the visual field assistance depends only on the angle of view of the camera, so that the visual field of the driver can be greatly expanded as long as the angle of view of the camera is well matched. Avoiding unnecessary shielding in use.

The utility model discloses in, realize motor vehicle indirect field of vision device through FPGA (field programmable gate array) chip, degree of depth adaptation image biography is synchronous with the chronogenesis of display, point-to-point transmission, under inventor's test standard, it is less than 20 ms's delay index to reach complete machine image time delay, be close traditional glass light-proof mirror more, compare with time delay 100ms, the time delay reduces 5 times, the vehicle is under 120Km/h traveles, the content that sees through the display screen has more than actual 0.6 meters late, the driving safety of very big improvement.

Moreover, an FPGA (field programmable gate array) chip can be flexibly adapted to different image sensors and display devices, a video recording and playback interface is provided, an image processing algorithm can be updated through user upgrade, and the flexibility and the expandability of a product are improved; the method has the advantages of no need of slide, shorter development period, lower development cost and the like, and is more beneficial to popularization of the indirect visual field device of the motor vehicle; the method achieves low cost and low time delay, so that a driver or AI can obtain effective images in time to make correct decisions, and safety accidents are reduced.

Referring to fig. 2, the above preferred embodiment of the present invention is in actual use, camera 1 collects images and transmits to the FPGA chip, it first performs timing sequence detection, generates frame synchronization interrupt signal, then performs image processing and digital zooming in time, after completion, stores current image data into line buffer, takes out data from buffer by timing sequence generation module in display module, generates display timing sequence and data signal, and judges whether the images align with the current display timing sequence through software, and makes corresponding adjustment, the adjustment flow of software to the images is as shown in fig. 3.

It should be noted that the FPGA chip is a logic cell array chip which is widely used, the main purpose of the present invention is to utilize the chip to reduce the delay rate of image acquisition, processing and display of the field of view device, and not to the specific processing mode of the FPGA chip and its image, and the improvement proposed by the principle of using software and hardware, so that the detailed description is not repeated for the aforementioned principle, processing mode and control mode, and the technical personnel in the field can refer to the general principle of image processing and display and the application mode of the FPGA chip in the prior art to reproduce the present invention.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. The utility model provides a low time delay motor vehicle indirect field of vision device based on FPGA which characterized in that: the automobile image acquisition system comprises a camera (1) installed outside a motor vehicle, wherein the camera (1) is connected to an FPGA module (2), the FPGA module (2) is respectively connected to a video module (3) and a display screen (4) and used for acquiring images by the camera (1) and transmitting the images to the FPGA module (2), and the images are respectively transmitted to the video module (3) and the display screen (4) after being processed by the FPGA module (2); the display screen (4) is intended to be mounted inside the cab of a motor vehicle.

2. The FPGA-based low-latency indirect field of view device of a motor vehicle of claim 1, wherein: the camera (1) is connected into a parallel device (5) in the FPGA module (2) through a serializer (6), and the parallel device (5) is connected into an FPGA chip (21) in the FPGA module (2).

3. The FPGA-based low-latency indirect field of view device of a motor vehicle of claim 2, wherein: the FPGA chip (21) is respectively connected to the video module (3) through a video interface and a playback interface.

4. The FPGA-based low-latency indirect field of view device of a motor vehicle of claim 1, wherein: the FPGA module (2) is further provided with a key (7), and the key (7) is connected to an FPGA chip (21) inside the FPGA module (2).