CN112040173A - Method for rapidly displaying reversing video through Android car machine system - Google Patents
Method for rapidly displaying reversing video through Android car machine system Download PDFInfo
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- CN112040173A CN112040173A CN202010697166.9A CN202010697166A CN112040173A CN 112040173 A CN112040173 A CN 112040173A CN 202010697166 A CN202010697166 A CN 202010697166A CN 112040173 A CN112040173 A CN 112040173A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/265—Mixing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- Multimedia (AREA)
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- Combustion & Propulsion (AREA)
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Abstract
A method for rapidly displaying a reversing video through an Android car machine system comprises the following steps: s100, powering on an Android car machine system, and starting an Android system cold machine; s200, loading a bootstrap program of the vehicle-mounted processor, booting a bootloader program, initializing a controller related to Android system display through the bootloader program, and booting kernel programs of the Android system and the linux system through the bootloader program; s300, completing the starting of the linux system, and loading a reversing video application program; after the Android kernel is started, starting a JAVA virtual machine and running an Android application program; s400, continuously detecting whether a reversing signal exists by the application program of the Linux system, and executing S500 when the reversing signal is detected; s500, camera video data are obtained through the Linux system, and the obtained camera video data are displayed on a display screen of the Android car machine. Compared with the prior art that the reverse video is displayed rapidly in a hardware mode and a software mode, the method has the advantages of low cost, more flexible realization, high reverse video display speed and the like.
Description
Technical Field
The invention relates to the technical field of car machines, in particular to a method for quickly displaying a car backing video by an Android car machine system.
Background
In the current car backing scheme, if a Linux or WinCE system is adopted, the system is loaded faster, the hardware resources are not occupied high, and the file system is smaller, so that the starting speed is higher, and the fast car backing video display is easier to realize. However, with the requirement of networking of automobiles, more and more automobile manufacturers begin to use Android. Due to the openness of the Android system, the entire software ecosystem is relatively sound, application development is simple, the Android ecology is rapidly expanded from a mobile phone to the fields of intelligent automobiles and the like with the support of software developers, telecom operators and chip manufacturers, and more vehicle-mounted systems begin to adopt the Android system.
In the current Android car machine system, two implementation modes of hardware and software are adopted for fast backing video display.
The hardware mode is that a video signal selection chip is added between a CPU and an LCD display screen, the video signal selection chip is provided with two paths of video input and one path of video output interface, the two paths of video input are respectively a UI interface of an Android system and backing video data, and the backing state software is used for judging which path is output. However, since a video signal selection chip needs to be added between the CPU of the Android car machine and the LCD display screen, and a DSP chip for camera processing needs to be added at the periphery, the cost is increased, and the problems of complex PCB wiring and the like are also caused.
The implementation of the software mode is that after the Android kernel is started, the application program of the reverse video display is started just before the Android initialization process starts, and the execution program is implemented by C language and then compiled into an executable program, so that the program can be executed after the Android kernel is started and before the JAVA virtual machine and the APP run. The backing application C program usually adopts a V4L2 framework, directly calls a bottom layer drive to display a backing video interface, and calls app to display after Android is started, so that starting and loading time of the Android application is saved, and the purpose of rapid backing can be achieved. However, after the Android driver loading is completed and the Android driver enters the initialization process, the application program for backing can be operated, so that the backing process is realized. And if the existing Android peripherals are more, the number of driving modules is increased, if a module with longer loading time is encountered, the whole loading time of the Android driving is too long, the time for displaying the corresponding reversing video is delayed, and if the Android car is started in a cold machine and the requirement for displaying the reversing video is short, the function cannot be realized.
Disclosure of Invention
In view of the above, the present invention has been developed to provide a solution to, or at least partially solve, the above problems.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
compared with the hardware implementation mode that a video signal selection chip and a processing chip are added between a CPU and an LCD display screen in the prior art, the method for rapidly displaying the car backing video through the Android car machine system not only can greatly reduce cost, but also is more flexible to implement, and after the Android system is started, a UI (user interface) of the Android system can be fused with the car backing video to display a final car backing interface. Compared with a software implementation mode in the prior art, the method has the advantages that the Linux system and the Android system are simultaneously operated in the vehicle machine system, the Linux system is cut and optimized, the operation speed is high, and the reverse interface can be displayed without waiting for the completion of the loading of the kernel of the Android system, so that the speed for displaying the reverse video is high.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a method for quickly displaying a reverse video by an Android car machine system in embodiment 1 of the present invention;
fig. 2 is a flowchart illustrating the step S500 in embodiment 1 of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example 1
The embodiment discloses a method for rapidly displaying a reversing video by an Android car machine system, which comprises the following steps:
s100, powering on an Android car machine system, and starting an Android system cold machine.
Specifically, cold boot refers to when an application is started, the system does not have a process of the application, and then the system creates a new process to be allocated to the application. For example, the application is started for the first time after installation or started again after the application process is finished. Specifically, the system will create and initialize an Application class, then create and initialize a MainActivity class (including a series of measurements, layouts, renderings), and finally display the Application on the interface. The warm start refers to a process of an Application existing in a system when the Application is started, so that an Application class is not created and initialized, a MainActivity class (comprising a series of measurement, layout and drawing) is directly created and initialized, and finally the Application is displayed on an interface. For example, pressing back key and home key will exit the current application, but the process of the application still remains in the background, and then clicking the application again is the warm start.
S200, loading a bootstrap program of the vehicle-mounted processor, booting a bootloader program, initializing a controller related to Android system display through the bootloader program, and booting kernel programs of the Android system and the linux system through the bootloader program.
Specifically, the boot program of the onboard processor is started to be loaded through the step S200, the bootloader program is booted, and when the bootloader program is initialized, the register of the hardware of the display control part of the Android is initialized. After the initialization is completed, the backing image can be normally displayed in the bootloader at the moment, and display preparation can be made for the backing video displayed and acquired by the Linux system. After the display part is initialized, copying the kernel program and the file system of linux and the kernel program of Android into the memory, and then executing the process of S300.
S300, completing the starting of the linux system, and loading a reversing video application program; and after the Android kernel is started, starting the JAVA virtual machine and running the Android application program.
In some preferred embodiments, the Android system and the linux system both operate in a pre-divided memory space, and the operation of the systems is not interfered with each other. Moreover, the kernel function of the Linux system is cut, the drive module and the function are single, and the Linux system only has the function of processing the reversing video. Therefore, the loading speed is high, and the display can be performed without waiting for the completion of the loading of the Android system driver. And when the Linux kernel finishes loading, starting to execute the application program for loading the backing video in Linux. And simultaneously, after the Android kernel is loaded, starting an initialization application process, starting to load an application program, starting a Java virtual machine, and running the Android application program.
S400, continuously detecting whether a reverse signal exists by the application program of the Linux system, and executing the step S500 when the reverse signal is detected.
In some preferred embodiments, S400 further comprises: and when the reverse signal is not detected, continuously detecting the reverse signal by the Linux system application program background program, and continuously starting the Android car machine system until the Linux system application program detects the reverse signal.
S500, camera video data are obtained through the Linux system, and the obtained camera video data are displayed on a display screen of the Android car machine.
In some preferred embodiments, as shown in fig. 2, S500 specifically includes:
s501, initializing a camera and display related parameters by the Linux system, and applying for a frame video buffer flow; through the step S501, preparation is made for the Linux system to acquire the camera data.
S502, a linux system acquires video data previewed by a camera and puts the acquired video data into an applied frame video buffer; and simultaneously acquiring layer information of camera video output, and setting the layer hierarchical relation of the layer in the display controller, where the linux system camera frame data is located.
In some preferred embodiments, the layer hierarchy relationship of the layer in the display controller where the linux system camera frame data is located is set as the topmost layer.
In some preferred embodiments, the linux system obtains video data for camera preview by calling the standard architecture of the system V4L 2.
S503, overlapping and fusing the layer displayed by the Android system and the layer where the Linux system camera frame data is located according to a layer hierarchical relationship, wherein the video interface after overlapping and fusing of the layer is used for displaying the backing video data through an LCD controller in the processor and a display screen of the Android car machine.
In some preferred embodiments, the display controller adopts a hardware window synthesizer in the onboard processor, and the layer displayed by the Android system and the layer where the Linux system camera frame data is located are overlapped and fused according to a layer hierarchical relationship.
Compared with the hardware implementation mode that a video signal selection chip and a processing chip are added between a CPU and an LCD display screen in the prior art, the method for rapidly displaying the car backing video through the Android car machine system provided by the embodiment of the invention not only can greatly reduce the cost, but also can be more flexibly implemented, and after the Android system is started, a UI (user interface) of the Android system can be fused with the car backing video to display a final car backing interface. Compared with a software implementation mode in the prior art, the method has the advantages that the Linux system and the Android system are simultaneously operated in the vehicle machine system, the Linux system is cut and optimized, the operation speed is high, and the reverse interface can be displayed without waiting for the completion of the loading of the kernel of the Android system, so that the speed for displaying the reverse video is high.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Of course, the processor and the storage medium may reside as discrete components in a user terminal.
For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
Claims (9)
1. A method for rapidly displaying a reversing video by an Android car machine system is characterized by comprising the following steps:
s100, powering on an Android car machine system, and starting an Android system cold machine;
s200, loading a bootstrap program of the vehicle-mounted processor, booting a bootloader program, initializing a controller related to Android system display through the bootloader program, and booting kernel programs of the Android system and the linux system through the bootloader program;
s300, completing the starting of the linux system, and loading a reversing video application program; after the Android kernel is started, starting a JAVA virtual machine and running an Android application program;
s400, continuously detecting whether a reversing signal exists by using the Linux system application program, and executing the step S500 when the reversing signal is detected;
s500, camera video data are obtained through the Linux system, and the obtained camera video data are displayed on a display screen of the Android car machine.
2. The method for rapidly displaying the reverse video by the Android car machine system according to claim 1, wherein in S200, when a bootloader program is initialized, a register of hardware of a display control part of the Android is initialized, and after the display part is initialized, a kernel program and a file system of linux and a kernel program of the Android are copied to a memory.
3. The method for rapidly displaying the reverse video by the Android car machine system according to claim 1, wherein in S300, the Android system and the linux system operate in a pre-divided memory space, and the operation of the Android system and the linux system is not interfered with each other.
4. The method for rapidly displaying the reverse video by the Android car machine system according to claim 1, wherein the S400 further comprises: and when the reverse signal is not detected, continuously detecting the reverse signal by the Linux system application program background program, and continuously starting the Android car machine system until the Linux system application program detects the reverse signal.
5. The method for rapidly displaying the reverse video by the Android car machine system according to claim 1, wherein the S500 specifically includes:
s501, initializing a camera and display related parameters by the Linux system, and applying for a frame video buffer flow;
s502, a linux system acquires video data previewed by a camera and puts the acquired video data into an applied frame video buffer; simultaneously acquiring layer information output by a camera video, and setting a layer hierarchical relation of a layer in a display controller, where the layer is located by the camera frame data of the linux system;
s503, overlapping and fusing the layer displayed by the Android system and the layer where the Linux system camera frame data is located according to a layer hierarchical relationship, wherein a video interface obtained after the layer overlapping and fusing is used for displaying video data through an LCD controller in a processor and a display screen of the Android car machine.
6. The method for rapidly displaying the reverse video by the Android car machine system according to claim 5, wherein a layer level relationship of a layer in a display controller where the linux system camera frame data is located is the topmost layer.
7. The method for rapidly displaying the reverse video by the Android car machine system according to claim 5, wherein the linux system acquires video data previewed by the camera by calling a standard architecture of a system V4L 2.
8. The method for rapidly displaying the reverse video by the Android car machine system according to claim 5, characterized in that a display controller adopts a hardware window synthesizer in an onboard processor to superpose and fuse a layer displayed by the Android system and a layer where the Linux system camera frame data is located according to a layer hierarchical relationship.
9. The method for rapidly displaying the reverse video through the Android car machine system according to claim 1, wherein the Linux system is cut and only has a function of processing the reverse video.
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| CN113071511A (en) * | 2021-04-21 | 2021-07-06 | 中国第一汽车股份有限公司 | Method and device for displaying reverse image, electronic equipment and storage medium |
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| CN112667335A (en) * | 2020-12-25 | 2021-04-16 | 北京百度网讯科技有限公司 | Method, device and equipment for loading image frames of backing car and storage medium |
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