CN105635668A - Image displaying method and device - Google Patents
Image displaying method and device Download PDFInfo
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- CN105635668A CN105635668A CN201510990334.2A CN201510990334A CN105635668A CN 105635668 A CN105635668 A CN 105635668A CN 201510990334 A CN201510990334 A CN 201510990334A CN 105635668 A CN105635668 A CN 105635668A
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- picture signal
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- framebuffer
- frame
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
Abstract
The present invention discloses an image displaying method and device. The method can be applied to the terminal device based on an embedded system. The method comprises the step of calling frame buffer equipment in a kernel mode to receive an image signal outputted by a video device kernel driver in an embedded system kernel boot process, and calling the frame buffer equipment in a kernel mode to output the image signal to a display screen in the embedded system kernel boot process. Thus the waiting of the completion of the embedded system kernel boot is not needed, the image displayed can be started in the kernel boot process, and thus the image display response speed can satisfy needs.
Description
Technical field
The present invention relates to image display, in particular it relates to a kind of image display method and device.
Background technology
Based in the terminal unit of embedded system, require over the image application running on User space in embedded system and the picture signal received is transferred to frame buffering, picture signal is exported display screen from framebuffer device by call frame buffer device, completes image display. Such as, based on the reverse image car-mounted terminal of android system.
And embedded system is based on kernel and realizes, therefore, image application at least needs after by the time kernel has started, to start image display, and therefore, image display response speed is generally not capable of meeting needs.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of image display method and device, to realize improving the purpose of image display response speed.
In in first of the embodiment of the present invention, provide a kind of image display method, it is applied to the terminal unit based on embedded system, the method includes: in described embedded system kernel start-up course, the picture signal of video equipment kernel-driven output is received at kernel state call frame buffer device, in described embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen.
Alternatively, described in described embedded system kernel start-up course, the picture signal receiving the output of video equipment kernel-driven at kernel state call frame buffer device includes: in embedded system kernel start-up course, call, at kernel state, the picture signal that described video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform, call described framebuffer device receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform.
Alternatively, described method also includes: after embedded system has started, and sends notice by applying at the image of User space to kernel state, and described notice is for stopping at kernel state calling described graphics processing unit.
Alternatively, described method also includes: after embedded system has started, and calls described framebuffer device at User space and the picture signal that output applied by the image at User space is exported display screen.
Alternatively, described framebuffer device includes the first framebuffer device independently and the second framebuffer device, wherein, the picture signal of described first framebuffer device output covers the picture signal of described second framebuffer device output in described embedded system kernel start-up course. Wherein, described first framebuffer device is for receiving the picture signal of video equipment kernel-driven output, and described second framebuffer device is for receiving the picture signal of described image application output. Described in described embedded system kernel start-up course, call described framebuffer device at kernel state described picture signal is exported display screen to include: in embedded system kernel start-up course, call the frame switching output intent of described first framebuffer device at kernel state, make the picture signal in described first framebuffer device export display screen. It is described after embedded system has started, call described framebuffer device at User space the picture signal that output applied by the image at User space is exported display screen and included: after embedded system has started, applied by described image, close described first framebuffer device, and by the frame switching output intent at the second framebuffer device described in the display service call of User space, make the picture signal in described second framebuffer device export display screen.
Alternatively, described framebuffer device includes the frame in same framebuffer device and cushions the firstth district and frame cushions the secondth district, wherein, described frame cushions the frame buffer zone that the firstth district is the application the unknown of described image, and it is that known frame buffer zone applied by described image that described frame cushions the secondth district. Wherein, the frame of described framebuffer device cushions the firstth district for receiving the picture signal of video equipment kernel-driven output, and the frame of described framebuffer device cushions the secondth district for receiving the picture signal of described image application output. Described in described embedded system kernel start-up course, call described framebuffer device at kernel state described picture signal is exported display screen to include: in embedded system kernel start-up course, the picture signal that described frame cushions in the firstth district is exported display screen by the frame switching output intent calling described framebuffer device at kernel state, further, stop the display service at User space that the frame of described framebuffer device is switched calling of output intent. It is described after embedded system has started, call described framebuffer device at User space the picture signal that output applied by the image at User space is exported display screen and included: after embedded system has started, applied by described image, release the prevention to described display service, switch output intent by the frame of framebuffer device described in described display service call and the picture signal that described frame cushions in the secondth district is exported display screen.
Alternatively, described terminal unit is vehicle-mounted terminal equipment. The picture signal that described video equipment kernel-driven receives is the reverse image signal of the collected by camera being connected with described car-mounted terminal.
Alternatively, described embedded system is the embedded system based on linux kernel.
In in second of the embodiment of the present invention, provide a kind of image display, it is configured at the terminal unit based on embedded system, this device includes: picture signal receives module, it is configured in described embedded system kernel start-up course, receives the picture signal of video equipment kernel-driven output at kernel state call frame buffer device. Kernel state display module, is configured in described embedded system kernel start-up course, calls described framebuffer device at kernel state and described picture signal is exported display screen.
Alternatively, described picture signal receives module and is configured in embedded system kernel start-up course, call, at kernel state, the picture signal that described video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform, call described framebuffer device receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform.
Alternatively, described device also includes: notification module, is configured to after embedded system has started, and sends notice by applying at the image of User space to kernel state, and described notice is for stopping at kernel state calling described graphics processing unit.
Alternatively, described device also includes: User space display module, is configured to after embedded system has started, and calls described framebuffer device at User space and the picture signal that output applied by the image at User space is exported display screen.
Alternatively, described framebuffer device includes the first framebuffer device independently and the second framebuffer device, wherein, the picture signal of described first framebuffer device output covers the picture signal of described second framebuffer device output in described embedded system kernel start-up course. Wherein, described first framebuffer device is for receiving the picture signal of video equipment kernel-driven output, and described second framebuffer device is for receiving the picture signal of described image application output. Described kernel state display module is configured in embedded system kernel start-up course, calls the frame switching output intent of described first framebuffer device at kernel state, makes the picture signal in described first framebuffer device export display screen. Described User space display module is configured to after embedded system has started, applied by described image, close described first framebuffer device, and by the frame switching output intent at the second framebuffer device described in the display service call of User space, make the picture signal in described second framebuffer device export display screen.
Alternatively, described framebuffer device includes the frame in same framebuffer device and cushions the firstth district and frame cushions the secondth district, wherein, described frame cushions the frame buffer zone that the firstth district is the application the unknown of described image, and it is that known frame buffer zone applied by described image that described frame cushions the secondth district. Wherein, the frame of described framebuffer device cushions the firstth district for receiving the picture signal of video equipment kernel-driven output, and the frame of described framebuffer device cushions the secondth district for receiving the picture signal of described image application output. Described kernel state display module is configured in embedded system kernel start-up course, the picture signal that described frame cushions in the firstth district is exported display screen by the frame switching output intent calling described framebuffer device at kernel state, further, stop the display service at User space that the frame of described framebuffer device is switched calling of output intent. Described User space display module is configured to after embedded system has started, applied by described image, release the prevention to described display service, switch output intent by the frame of framebuffer device described in described display service call and the picture signal that described frame cushions in the secondth district is exported display screen.
Alternatively, described terminal unit is vehicle-mounted terminal equipment. The picture signal that described video equipment kernel-driven receives is the reverse image signal of the collected by camera being connected with described car-mounted terminal.
Alternatively, described embedded system is the embedded system based on linux kernel.
Pass through technique scheme, due in embedded system kernel start-up course, the picture signal of video equipment kernel-driven output is received at kernel state call frame buffer device, therefore, in embedded system kernel start-up course, it is possible to call described framebuffer device at kernel state and described picture signal is exported display screen, without waiting until that embedded system kernel has started, can starting image display in kernel start-up course, therefore, image display response speed disclosure satisfy that needs.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below. In the accompanying drawings:
Fig. 1 is the schematic diagram of a kind of implementation environment according to the present invention one exemplary embodiment.
Fig. 2 is the flow chart of a kind of image display method according to the present invention one exemplary embodiment.
Fig. 3 is the flow chart of a kind of image display method according to another exemplary embodiment of the present invention.
Fig. 4 is the flow chart of a kind of image display method according to further example embodiment of the present invention.
Fig. 5 is the schematic diagram of a kind of implementation environment according to another exemplary embodiment of the present invention.
Fig. 6 is the schematic diagram of a kind of implementation environment according to further example embodiment of the present invention.
Fig. 7 is the block diagram of a kind of image display according to the present invention one exemplary embodiment.
Fig. 8 is the block diagram of a kind of image display according to another exemplary embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail. It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
Fig. 1 is the schematic diagram of a kind of implementation environment according to an exemplary embodiment. As it is shown in figure 1, this implementation environment may include that the terminal unit 110 based on android system, and, wired or wireless with described terminal unit 110 be connected camera 120, display screen 130.
Wherein, android system realizes on based on the basis of linux kernel, and with IMX6 for platform, system is divided into kernel spacing and user's space. In kernel spacing, for instance, it is possible to including: Video Decoder 1101 (Decoder), video equipment kernel-driven 1102 (V4L, VideoforLinux), framebuffer device 1103 (FrameBuffer). In linux kernel start-up course, it is possible to each equipment of kernel spacing detected, thus opening and enable these equipment.
Wherein, the picture signal (signal of video signal or Low Voltage Differential Signal) of camera 120 output decodes through Decoder, it is transferred to the camera sensor interface 1102a (CSI of V4L, CameraSensorInterface), thus being received in DMA (DirectMemoryAccess, Direct data access) mode by V4L. V4L manages at least 2, usually 3 or above image buffer (Camera_Buffer), when a frame image signal finishes receiving, V4L specifies next frame picture signal to receive in another Camera_Buffer, thus realizing the dynamic reception of image.
FrameBuffer also manages at least 2, it is usually 3 or above relief area (buffer), by the switching between buffer, picture signal in different buffer is transferred to Low Voltage Differential Signal display bridge (LVDSDisplayBridge by buffer with dma mode, it is called for short LDB) parts/HDMI (High-DefinitionMultimediaInterface, it is called for short HDMI) parts 1104, final output is to display screen 130, thus realizing the change of display content.
It is understandable that, this implementation environment is only for illustrating the embodiment of the present invention, the method that the embodiment of the present invention provides can apply to the embedded system based on linux kernel, but it is not limited merely to be applied to the terminal unit based on linux kernel, can be widely applied in the terminal unit of various embedded system.
Fig. 2 is the flow chart of a kind of image display method according to the present invention one exemplary embodiment. The present embodiment is applied to terminal unit 110 shown in Fig. 1 in this way and illustrates. The method may include that
In step 210, in embedded system kernel start-up course, receive the picture signal of video equipment kernel-driven output at kernel state call frame buffer device.
For example, it is possible in linux kernel start-up course, call FrameBuffer shown in Fig. 1 at kernel state and receive the picture signal of V4L output.
In a step 220, in embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen.
For example, it is possible in linux kernel start-up course, call FrameBuffer shown in Fig. 1 at kernel state and described picture signal exported display screen.
It is understood that calling at kernel state described in the embodiment of the present invention, it is possible to being realized by numerous embodiments, this is not limited by the present invention. For example, it is possible to called described in kernel state realization by the worker thread of interrupt handling routine or kernel state. Its interrupt message sent when can catch each equipment work in kernel spacing, control relevant device according to the interrupt message captured and carry out relevant execution, thus forming program flow, it is achieved embodiment of the present invention control required for kernel state in embedded system kernel start-up course.
Specifically, such as, in linux kernel start-up course, the implementing of picture signal calling FrameBuffer reception V4L output at kernel state can be: catches the V4L interrupt message sent when having exported the picture signal of the Camera_Buffer currently pointed to, according to this interrupt message, call FrameBuffer and receive the picture signal of the V4L Camera_Buffer currently pointed to output, call the V4L method for switching buffer, switch another Camera_Buffer and continue to put out picture signal. Again such as, in linux kernel start-up course, call described FrameBuffer at kernel state described picture signal exports implementing of display screen can be: catch the FrameBuffer interrupt message sent when having exported the picture signal of a buffer, call ioctl (PAN_DISPLAY) method of FrameBuffer according to this interrupt message, switch another buffer output image signal to display screen.
Owing to can be divided into the program at kernel state and the program at User space based on the program on the terminal unit of embedded system. And have privilege in the program of kernel state, it is possible to unrestrictedly system is stored, equipment conducts interviews. Therefore, the embodiment of the present invention is according to this feature, in embedded system kernel start-up course, at kernel state, the equipment such as the framebuffer device of kernel spacing, video equipment kernel-driven are called, as included, call frame buffer device receives the picture signal of video equipment kernel-driven output, described picture signal is exported display screen by call frame buffer device, etc., from without waiting until that embedded system kernel has started, embedded system kernel start-up course can start image display, therefore, image display response speed disclosure satisfy that needs.
Such as, terminal unit 110 can be the car-mounted terminal based on embedded system. In this embodiment, terminal unit 110 is in embedded system kernel start-up course, the signal that reverses gear can be detected, and then the video equipment kernel-driven in the terminal unit 110 of the method for application embodiment of the present invention offer can receive the reverse image signal of the collected by camera being connected with described car-mounted terminal.
Fig. 3 is the flow chart of a kind of image display method according to another exemplary embodiment of the present invention. The present embodiment is applied to terminal unit 110 shown in Fig. 1 in this way and illustrates. The method may include that
In the step 310, in embedded system kernel start-up course, call, at kernel state, the picture signal that described video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform.
Such as, in implementation environment shown in Fig. 1, in linux kernel start-up course, it is possible to call graphics processing unit at kernel state and the picture signal exported of V4L shown in Fig. 1 is carried out image scaling and/or gamut transform. Specifically, such as, V4L is captured when the interrupt message having exported the picture signal of a Camera_Buffer and send at kernel state, call graphics processing unit (IPU, ImageProcessingUnit) and this Camera_Buffer of V4L picture signal exported is carried out image scaling and/or gamut transform.
In step 311, kernel state call described framebuffer device receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform.
Such as, in implementation environment shown in Fig. 1, it is possible to call described FrameBuffer receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform. Specifically, such as, when graphics processing unit image scaling and/or gamut transform complete, can capture graphics processing unit image scaling and/or gamut transform completes the interrupt message that sends, call FrameBuffer receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform.
In step 320, in embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen.
Such as, in implementation environment shown in Fig. 1, it is possible in linux kernel start-up course, call described FrameBuffer at kernel state and described picture signal is exported display screen. It is understandable that, when the image size of picture signal of V4L output, colour gamut require consistent with FrameBuffer, then without being carried out image scaling and/or colour gamut change by graphics processing unit, it is possible to directly the picture signal that V4L exports is exported FrameBuffer.
Additionally, due to after embedded system has started, image scaling and/or colour gamut change can be carried out by the image application call graphics processing unit of User space, therefore, after embedded system has started, the image at User space can be passed through apply to kernel state (such as, to the interrupt handling routine of kernel state) send notice, described notice is for stopping at kernel state to the calling of described graphics processing unit (interrupt handling routine such as, receiving this notice stops calling described graphics processing unit).
Pass through the embodiment of the present invention, can in embedded system kernel start-up course, call, at kernel state, the picture signal that video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform, and then output is to framebuffer device, picture signal is exported display screen by call frame buffer device. Thus applying the terminal unit of the method that the embodiment of the present invention provides, it is not necessary to waiting until that embedded system kernel has started, can start image display in embedded system kernel start-up course, therefore, image display response speed disclosure satisfy that needs.
Fig. 4 is the flow chart of a kind of image display method according to further example embodiment of the present invention. The present embodiment is applied to terminal unit 110 shown in Fig. 1 in this way and illustrates. The method may include that
In step 410, in embedded system kernel start-up course, call, at kernel state, the picture signal that video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform.
In step 411, picture signal in the reception graphics processing unit output of kernel state call frame buffer device, through image scaling and/or gamut transform.
At step 420, in embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen.
In step 430, after embedded system has started, call described framebuffer device at User space and the picture signal of described image application output is exported display screen.
It should be noted that the picture signal of described image application output is exported the specific implementation of display screen and does not limit calling described framebuffer device at User space by the embodiment of the present invention.
Such as, in a kind of possible embodiment, described framebuffer device can include the first framebuffer device independently and the second framebuffer device, wherein, the picture signal of described first framebuffer device output covers the picture signal of described second framebuffer device output in described embedded system kernel start-up course. Wherein, described first framebuffer device is for receiving the picture signal of video equipment kernel-driven output, and described second framebuffer device is for receiving the picture signal of described image application output. In this embodiment, in embedded system kernel start-up course, it is possible to call the frame switching output intent of described first framebuffer device at kernel state, make the picture signal in described first framebuffer device export display screen. After embedded system has started, applied by described image, close described first framebuffer device, and by the frame switching output intent at the second framebuffer device described in the display service call of User space, make the picture signal in described second framebuffer device export display screen.
It is applied to the terminal unit based on android system for this embodiment. The schematic diagram of the implementation environment shown in another exemplary embodiment shown in Figure 5. FrameBuffer1103 can include a FrameBuffer1103a independently and the 2nd FrameBuffer1103b, wherein, the picture signal of a FrameBuffer output covers the picture signal of described 2nd FrameBuffer output in described embedded system kernel start-up course. For example, it is possible to realize described covering by calling the overlay method of graphics processing unit. By described covering, in embedded system kernel start-up course during a FrameBuffer output image signal, the picture signal of the 2nd FrameBuffer output does not show; And after starting at embedded system kernel, when a FrameBuffer equipment does not export, then can show the picture signal of the 2nd FrameBuffer output. In this embodiment, calling a FrameBuffer at kernel state and receive the picture signal of V4L output, Android shows that service 1106 (SurfaceFlinger shown in Fig. 5) is called the 2nd FrameBuffer and received image application 1107 (CameraAPK shown in Fig. 5) picture signal exported. By this embodiment, it is possible in linux kernel start-up course, call the PAN_DISPLAY method of a described FrameBuffer at kernel state, make the picture signal in a FrameBuffer export display screen. After the android system based on linux kernel has started, applied by image, close a FrameBuffer, and by the PAN_DISPLAY method that Android shows service call the 2nd FrameBuffer, make the picture signal in the 2nd FrameBuffer export display screen.
Again such as, in alternatively possible embodiment, described framebuffer device includes the frame in same framebuffer device and cushions the firstth district and frame cushions the secondth district, wherein, described frame cushions the frame buffer zone that the firstth district is the application the unknown of described image, and it is that known frame buffer zone applied by described image that described frame cushions the secondth district. Wherein, the frame of described framebuffer device cushions the firstth district for receiving the picture signal of video equipment kernel-driven output, and the frame of described framebuffer device cushions the secondth district for receiving the picture signal of described image application output. In this embodiment, in embedded system kernel start-up course, the picture signal that described frame cushions in the firstth district is exported display screen by the frame switching output intent calling described framebuffer device at kernel state, further, stop the display service at User space that the frame of described framebuffer device is switched calling of output intent. After embedded system has started, applied by described image, release the prevention to described display service, by the frame switching output intent at framebuffer device described in the display service call of User space, the picture signal that described frame cushions in the secondth district is exported display screen.
It is applied to the terminal unit based on android system for this embodiment. The schematic diagram of the implementation environment shown in another exemplary embodiment shown in Figure 6. FrameBuffer1103 can include the frame in same FrameBuffer and cushion the first district 1103c and frame cushions the second district 1103d, wherein, it is the unknown frame buffer zone of described image application that frame cushions the firstth district, and frame cushions the secondth district and applies known frame buffer zone at the image of User space. In this embodiment, the frame calling described FrameBuffer at kernel state cushions the first district reception V4L picture signal exported, and Android display service 1106 (SurfaceFlinger shown in Fig. 6) calls the frame of described FrameBuffer and cushions second district's reception described image application 1107 (CameraAPK shown in Fig. 6) picture signal exported. By this embodiment, can in linux kernel start-up course, the picture signal that described frame cushions in the firstth district is exported display screen by the PAN_DISPLAY method calling described FrameBuffer at kernel state, further, Android display is stoped to service calling of the PAN_DISPLAY method to described FrameBuffer. After the android system based on described Linux has started, first pass through the application of described image, release the prevention to described Android display service, show that described in service call, the picture signal that described frame cushions in the secondth district is exported display screen by the PAN_DISPLAY method of FrameBuffer again through described Android. Finally can apply again through the image at User space and send notice to kernel state (to the interrupt handling routine of kernel state), for stopping at kernel state calling described graphics processing unit, and stop at kernel state and call the frame of described FrameBuffer and cushion the firstth district and receive the picture signal of V4L output.
This embodiment and a upper embodiment the difference is that, this embodiment is distinguished in framebuffer device frame and has cushioned the firstth district, frame cushions the secondth district, thus adding the quantity of buffer, the image that graphics processing unit exports after image scaling and/or gamut transform exports frame and cushions the firstth district, but do not notify that user program frame cushions the existence in the firstth district, thus picture signal when call frame buffer device, will not be write frame and cushions the firstth district by user program. And, in embedded system kernel start-up course, stop the display at User space to service switching display content. After embedded system starts, first cancel the prevention to display service, reinform kernel state and stop calling graphics processing unit, and the frame stopping call frame buffer device cushions the firstth district and receives the picture signal of video equipment kernel-driven output.
It can further be stated that, in above two embodiment, start in embedded system, the frame image signal that video equipment kernel-driven has received is to after relief area, corresponding skin bag (Surface) can also be applied by the image at User space to use, and this Surface, angle from display service, again as a figure layer (Layer), shown service synthesis output is in a relief area of framebuffer device, the frame switching output intent switching output of framebuffer device can be passed through afterwards, thus, embedded system can be switched to show from the image frame that kernel shows, it is superimposed with the image frame of UI. such as, it is vehicle-mounted terminal equipment at described terminal unit, when the picture signal that described video equipment kernel-driven receives is the reverse image signal of the collected by camera being connected with described car-mounted terminal, it is possible to the reverse image picture shown from embedded system kernel switches to reverse image picture that embedded system shows, that be superimposed with UI.
Fig. 7 is the block diagram of a kind of image display according to the present invention one exemplary embodiment. The present embodiment is configured at terminal unit 110 shown in Fig. 1 with this device and illustrates. This device may include that picture signal receives module 710, kernel state display module 720.
This picture signal receives module 710, it is possible to be configured in described embedded system kernel start-up course, receives the picture signal of video equipment kernel-driven output at kernel state call frame buffer device.
This kernel state display module 720, it is possible to be configured in described embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen.
Owing to can be divided into the program at kernel state and the program at User space based on the program on the terminal unit of embedded system. And have privilege in the program of kernel state, it is possible to unrestrictedly system is stored, equipment conducts interviews. Therefore, the embodiment of the present invention is according to this feature, in embedded system kernel start-up course, at kernel state, the equipment such as the framebuffer device of kernel spacing, video equipment kernel-driven are called, as included, call frame buffer device receives the picture signal of video equipment kernel-driven output, described picture signal is exported display screen by call frame buffer device, etc., from without waiting until that embedded system kernel has started, embedded system kernel start-up course can start image display, therefore, image display response speed disclosure satisfy that needs.
Fig. 8 is the block diagram of a kind of image display according to another exemplary embodiment of the present invention. The present embodiment is configured at terminal unit 110 shown in Fig. 1 with this device and illustrates.
As shown in Figure 8, in a kind of possible embodiment, described picture signal receives module 710 and can be configured in embedded system kernel start-up course, call, at kernel state, the picture signal that described video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform, call described framebuffer device receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform.
As shown in Figure 8, in alternatively possible embodiment, this device can also include: notification module 730, can be configured to after embedded system has started, sending notice by applying at the image of User space to kernel state, described notice is for stopping at kernel state calling described graphics processing unit.
As shown in Figure 8, in another possible embodiment, this device can also include: User space display module 740, it is possible to is configured to after embedded system has started, and calls described framebuffer device at User space and the picture signal that output applied by the image at User space is exported display screen.
It should be noted that the image passed through at User space is applied by the embodiment of the present invention, call described framebuffer device and the specific implementation that the picture signal of described image application output exports display screen is not limit.
Such as, in a kind of possible embodiment, described framebuffer device can include the first framebuffer device independently and the second framebuffer device, wherein, the picture signal of described first framebuffer device output covers the picture signal of described second framebuffer device output in described embedded system kernel start-up course. Wherein, described first framebuffer device is for receiving the picture signal of video equipment kernel-driven output, and described second framebuffer device is for receiving the picture signal of described image application output. In this embodiment, described kernel state display module 720 can be configured in embedded system kernel start-up course, call the frame switching output intent of described first framebuffer device at kernel state, make the picture signal in described first framebuffer device export display screen. Described User space display module 740 can be configured to after embedded system has started, applied by described image, close described first framebuffer device, and by the frame switching output intent at the second framebuffer device described in the display service call of User space, make the picture signal in described second framebuffer device export display screen.
Again such as, in a kind of possible embodiment, described framebuffer device can include the frame in same framebuffer device and cushion the firstth district and frame cushions the secondth district, wherein, described frame cushions the frame buffer zone that the firstth district is the application the unknown of described image, and it is that known frame buffer zone applied by described image that described frame cushions the secondth district. Wherein, the frame of described framebuffer device cushions the firstth district for receiving the picture signal of video equipment kernel-driven output, and the frame of described framebuffer device cushions the secondth district for receiving the picture signal number of described image application output. In this embodiment, described kernel state display module 720 can be configured in embedded system kernel start-up course, the picture signal that described frame cushions in the firstth district is exported display screen by the frame switching output intent calling described framebuffer device at kernel state, further, stop the display service at User space that the frame of described framebuffer device is switched calling of output intent. Described User space display module 740 can be configured to after embedded system has started, applied by described image, release the prevention to described display service, switch output intent by the frame of framebuffer device described in described display service call and the picture signal that described frame cushions in the secondth district is exported display screen.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing; but; the present invention is not limited to the detail in above-mentioned embodiment; in the technology concept of the present invention; technical scheme can being carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to be combined by any suitable mode. In order to avoid unnecessary repetition, various possible compound modes are no longer illustrated by the present invention separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (16)
1. an image display method, it is characterised in that being applied to the terminal unit based on embedded system, described method includes:
In described embedded system kernel start-up course, receive the picture signal of video equipment kernel-driven output at kernel state call frame buffer device;
In described embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen.
2. method according to claim 1, it is characterised in that described in described embedded system kernel start-up course, the picture signal receiving the output of video equipment kernel-driven at kernel state call frame buffer device includes:
In embedded system kernel start-up course, call, at kernel state, the picture signal that described video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform, call described framebuffer device receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform.
3. method according to claim 2, it is characterised in that described method also includes:
After embedded system has started, sending notice by applying at the image of User space to kernel state, described notice is for stopping at kernel state calling described graphics processing unit.
4. the method according to any one of claim 1-3, it is characterised in that described method also includes:
After embedded system has started, call described framebuffer device at User space and the picture signal that output applied by the image at User space is exported display screen.
5. method according to claim 4, it is characterized in that, described framebuffer device includes the first framebuffer device independently and the second framebuffer device, wherein, the picture signal of described first framebuffer device output covers the picture signal of described second framebuffer device output in described embedded system kernel start-up course;
Wherein, described first framebuffer device is for receiving the picture signal of video equipment kernel-driven output, and described second framebuffer device is for receiving the picture signal of described image application output;
Described in described embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen include:
In embedded system kernel start-up course, call the frame switching output intent of described first framebuffer device at kernel state, make the picture signal in described first framebuffer device export display screen;
Described after embedded system has started, call described framebuffer device at User space and the picture signal that output applied by the image at User space is exported display screen includes:
After embedded system has started, applied by described image, close described first framebuffer device, and by the frame switching output intent at the second framebuffer device described in the display service call of User space, make the picture signal in described second framebuffer device export display screen.
6. method according to claim 4, it is characterized in that, described framebuffer device includes the frame in same framebuffer device and cushions the firstth district and frame cushions the secondth district, wherein, described frame cushions the frame buffer zone that the firstth district is the application the unknown of described image, and it is that known frame buffer zone applied by described image that described frame cushions the secondth district;
Wherein, the frame of described framebuffer device cushions the firstth district for receiving the picture signal of video equipment kernel-driven output, and the frame of described framebuffer device cushions the secondth district for receiving the picture signal of described image application output;
Described in described embedded system kernel start-up course, call described framebuffer device at kernel state and described picture signal is exported display screen include:
In embedded system kernel start-up course, the picture signal that described frame cushions in the firstth district is exported display screen by the frame switching output intent calling described framebuffer device at kernel state, further, stop the display service at User space that the frame of described framebuffer device is switched calling of output intent;
Described after embedded system has started, call described framebuffer device at User space and the picture signal that output applied by the image at User space is exported display screen includes:
After embedded system has started, applied by described image, release the prevention to described display service;
Switch output intent by the frame of framebuffer device described in described display service call and the picture signal that described frame cushions in the secondth district is exported display screen.
7. method according to claim 1, it is characterised in that described terminal unit is vehicle-mounted terminal equipment;
The picture signal that described video equipment kernel-driven receives is the reverse image signal of the collected by camera being connected with described car-mounted terminal.
8. method according to claim 1, it is characterised in that described embedded system is the embedded system based on linux kernel.
9. an image display, it is characterised in that being configured at the terminal unit based on embedded system, described device includes:
Picture signal receives module, is configured in described embedded system kernel start-up course, receives the picture signal of video equipment kernel-driven output at kernel state call frame buffer device;
Kernel state display module, is configured in described embedded system kernel start-up course, calls described framebuffer device at kernel state and described picture signal is exported display screen.
10. device according to claim 9, it is characterized in that, described picture signal receives module and is configured in embedded system kernel start-up course, call, at kernel state, the picture signal that described video equipment kernel-driven exports by graphics processing unit and carry out image scaling and/or gamut transform, call described framebuffer device receive graphics processing unit output, through the picture signal of image scaling and/or gamut transform.
11. device according to claim 10, it is characterised in that described device also includes:
Notification module, is configured to after embedded system has started, and sends notice by applying at the image of User space to kernel state, and described notice is for stopping at kernel state calling described graphics processing unit.
12. according to the device described in any one of claim 9-11, it is characterised in that described device also includes:
User space display module, is configured to after embedded system has started, and calls described framebuffer device at User space and the picture signal that output applied by the image at User space is exported display screen.
13. device according to claim 12, it is characterized in that, described framebuffer device includes the first framebuffer device independently and the second framebuffer device, wherein, the picture signal of described first framebuffer device output covers the picture signal of described second framebuffer device output in described embedded system kernel start-up course;
Wherein, described first framebuffer device is for receiving the picture signal of video equipment kernel-driven output, and described second framebuffer device is for receiving the picture signal of described image application output;
Described kernel state display module is configured in embedded system kernel start-up course, calls the frame switching output intent of described first framebuffer device at kernel state, makes the picture signal in described first framebuffer device export display screen;
Described User space display module is configured to after embedded system has started, applied by described image, close described first framebuffer device, and by the frame switching output intent at the second framebuffer device described in the display service call of User space, make the picture signal in described second framebuffer device export display screen.
14. device according to claim 12, it is characterized in that, described framebuffer device includes the frame in same framebuffer device and cushions the firstth district and frame cushions the secondth district, wherein, described frame cushions the frame buffer zone that the firstth district is the application the unknown of described image, and it is that known frame buffer zone applied by described image that described frame cushions the secondth district;
Wherein, the frame of described framebuffer device cushions the firstth district for receiving the picture signal of video equipment kernel-driven output, and the frame of described framebuffer device cushions the secondth district for receiving the picture signal of described image application output;
Described kernel state display module is configured in embedded system kernel start-up course, the picture signal that described frame cushions in the firstth district is exported display screen by the frame switching output intent calling described framebuffer device at kernel state, further, stop the display service at User space that the frame of described framebuffer device is switched calling of output intent;
Described User space display module is configured to after embedded system has started, applied by described image, release the prevention to described display service, switch output intent by the frame of framebuffer device described in described display service call and the picture signal that described frame cushions in the secondth district is exported display screen.
15. device according to claim 9, it is characterised in that described terminal unit is vehicle-mounted terminal equipment;
The picture signal that described video equipment kernel-driven receives is the reverse image signal of the collected by camera being connected with described car-mounted terminal.
16. device according to claim 9, it is characterised in that described embedded system is the embedded system based on linux kernel.
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