WO2021120124A1 - Procédé et appareil d'affichage vidéo, et support d'enregistrement informatique - Google Patents

Procédé et appareil d'affichage vidéo, et support d'enregistrement informatique Download PDF

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Publication number
WO2021120124A1
WO2021120124A1 PCT/CN2019/126722 CN2019126722W WO2021120124A1 WO 2021120124 A1 WO2021120124 A1 WO 2021120124A1 CN 2019126722 W CN2019126722 W CN 2019126722W WO 2021120124 A1 WO2021120124 A1 WO 2021120124A1
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WIPO (PCT)
Prior art keywords
time
frame
timing signal
delay
sub
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PCT/CN2019/126722
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English (en)
Chinese (zh)
Inventor
王晓东
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上海飞来信息科技有限公司
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Priority to CN201980091613.1A priority Critical patent/CN113424487B/zh
Priority to PCT/CN2019/126722 priority patent/WO2021120124A1/fr
Publication of WO2021120124A1 publication Critical patent/WO2021120124A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter

Definitions

  • the embodiments of the present invention relate to the field of multimedia, and more specifically, to a method, device, and computer storage medium for video display.
  • the sequence of each step of video streaming is arranged in a streamlined manner.
  • the steps of video streaming include: the generating end of the video stream (such as a camera), the image processing part, the video compression part, and the wireless transmission part. , Video decompression part, video display part (such as LCD screen), etc.
  • the timing of each step needs to be matched with each other.
  • the timing between some steps may not be matched.
  • the received video frame may be asynchronous with the frame timing displayed on the screen.
  • the arrival of the new video frame is uncertain, so the previous frame may be displayed, the next frame may be displayed normally, or the next frame may be skipped to display the next frame, and so on. This may cause end-to-end delay jitter, as well as increased delay caused by buffering to overcome the delay jitter.
  • the embodiments of the present invention provide a method, a device and a computer storage medium for video display, which can ensure low end-to-end delay in video transmission.
  • a method for video display is provided, the method is a sub-frame level display method, and the method includes:
  • the receiving end receives a data packet from the sending end, the data packet including sub-frame level video data and time information of the frame timing signal;
  • the receiving end determines the local time corresponding to the time information according to the time information and the timing relationship between the sending end and the receiving end;
  • the receiving end determines a timing signal for refreshing the screen according to the local time and a preset delay time, where the delay time is preset at the receiving end according to the delay of each level of processing at the subframe level.
  • a device for video display is provided, the device is a receiving end of sub-frame level display, and the device includes:
  • the receiving unit is configured to receive a data packet from the sending end, the data packet including sub-frame level video data and time information of the frame timing signal;
  • a first determining unit configured to determine the local time corresponding to the time information according to the time information and the timing relationship between the sending end and the receiving end;
  • the second determining unit is configured to determine a timing signal for refreshing the screen according to the local time and a preset delay time, wherein the delay time is based on the delay of each level of processing at the sub-frame level. Pre-set at the end;
  • the processing unit is configured to start the current frame refresh according to the timing signal.
  • a device for video display including: a memory and a processor, wherein the memory is used to store computer instructions; the processor is used to call the computer instructions, when the When computer instructions are executed, they are used to perform sub-frame level display methods, including:
  • the receiving end receives a data packet from the sending end, the data packet including sub-frame level video data and time information of the frame timing signal;
  • the receiving end determines the local time corresponding to the time information according to the time information and the timing relationship between the sending end and the receiving end;
  • the receiving end determines a timing signal for refreshing the screen according to the local time and a preset delay time, where the delay time is preset at the receiving end according to the delay of each level of processing at the subframe level.
  • a computer-readable storage medium is provided, and a computer program is stored thereon, and when the computer program is executed by a processor, the steps of the method described in the first aspect are realized.
  • the display refreshing of the receiving end is controlled at the sub-frame level. After the time of the frame timing signal of the sending end, the fixed delay time is delayed to generate the frame timing of the refreshing display, which can avoid Due to the asynchronous time, a long wait is caused to achieve the minimum display delay.
  • Figure 1 is a schematic diagram of image transmission in the prior art
  • FIG. 2 is a schematic flowchart of a method for video display according to an embodiment of the present invention
  • Figure 3 is a schematic diagram of image transmission and display according to an embodiment of the present invention.
  • FIG. 4 is another schematic diagram of image transmission and display according to the embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of an apparatus for video display according to an embodiment of the present invention.
  • Fig. 6 is another schematic block diagram of an apparatus for video display according to an embodiment of the present invention.
  • sub-frame level processing is adopted, that is, video data is compressed and packaged in a time unit less than one frame, and then transmitted through the wireless physical layer.
  • Video frame, data compression and packaging, physical layer transmission, data reception, decompression, and display are performed in parallel in a pipeline manner in a time unit less than one video frame to obtain a lower image transmission delay.
  • the display In most systems, since the time of data reception is completely asynchronous with the timing of the video display part, in order to ensure the correctness of the display, the display generally adopts the method of frame buffering, and it will only proceed when the entire frame of data is received. Display, as shown in Figure 1, after the video is decompressed, make sure to get a whole frame of data, and then display it. This introduces a frame-level delay. Furthermore, in order to prevent timing jitter, a multi-frame buffer is required; long-term timing drift will also cause repeated display or dropped frame display.
  • the display screen mentioned in this application may be a liquid crystal display (LCD), and those skilled in the art will understand that the display screen may also be of other types, which is not limited by the present invention.
  • LCD liquid crystal display
  • an embodiment of the present invention provides a method for video display. As shown in FIG. 2, the method is a sub-frame level display method and includes:
  • the receiving end receives a data packet from the sending end, where the data packet includes sub-frame level video data and time information of the frame timing signal;
  • the receiving end determines the local time corresponding to the time information according to the time information and the timing relationship between the sending end and the receiving end;
  • the receiving end determines a timing signal for refreshing the screen according to the local time and a preset delay time, where the delay time is preset at the receiving end according to the delay of each level of processing at the subframe level;
  • S140 Start refreshing the current frame according to the timing signal.
  • a fixed delay time is preset at the receiving end, denoted as T.
  • the preset fixed delay time T may include delays of various stages of pipeline processing at the sub-frame level, including delays of image processing, video compression, physical layer transmission, and video decoding.
  • the delay time T may be the sum of the delays of various levels of processing at the sub-frame level.
  • the delay time T is equal to the sum of the following delays: sub-frame level delay of image processing, sub-frame level delay of video compression, sub-frame level delay of physical layer transmission, and sub-frame level delay of video decoding .
  • the delay of each level of processing can be determined in advance, and a fixed delay time T can be obtained by summation, and set at the receiving end.
  • the delay time T can be stored in advance in the form of a parameter at the receiving end. It can be seen that, in the embodiment of the present invention, all levels of processing in the entire image transmission system adopt sub-frame level control, so that the delay time T is fixed, thereby avoiding excessive jitter of the frame rate of the screen refresh.
  • the receiving end and the sending end perform time synchronization, so as to determine the timing relationship between the sending end and the receiving end.
  • the wireless communication physical layer of the receiving end maintains synchronization with the wireless communication physical layer of the transmitting end according to the physical layer timing adjustment mechanism.
  • the timing relationship is used to indicate the synchronization between the wireless communication physical layer of the receiving end and the wireless communication physical layer of the transmitting end.
  • the frame timing signal is sent to the wireless communication physical layer, and the value of the timing counter of the physical layer is latched, and the value represents the frame timing The time information of the signal.
  • the sending end sends the time information together with the video data to the receiving end.
  • the time information is the value of the timing counter of the physical layer at the transmitting end when the transmitting end generates the frame timing signal for video data output. Therefore, in S110, the receiving end can receive the video data and the time information of the frame timing signal. Assume that the time information of the frame timing signal is represented as t0.
  • the wireless communication physical layer of the receiving end obtains the local time t corresponding to the time information of the frame timing signal of the transmitting end according to the timing relationship between the receiving end and the transmitting end.
  • ⁇ t can be any value, for example, less than zero, greater than zero, or equal to zero.
  • a timer of the physical layer may be set to determine the timing of refreshing the current frame at time t+T.
  • a liquid crystal display controller may initiate a screen refresh according to the timing signal determined in S130.
  • sub-frame level control is adopted for the display refreshing of the receiving end. After the time of the frame timing signal of the sending end, a fixed delay time is delayed to generate the frame timing of the refreshing display, which can avoid the time delay. Asynchrony causes a long wait to achieve the minimum display delay. Moreover, since the entire image transmission system adopts sub-frame level control from the video stream generation, image processing, video compression, wireless transmission, and video decompression processes, image jitter can be avoided and the impact of timing drift can be overcome.
  • the method of the embodiment of the present invention may be as shown in FIG. 3, in which, at the transmitting end, the time information of the transmitted frame timing signal is recorded by a latch counter, and the value of the counter will be sent to the receiver together with the video data. end. Then the sending end sends the video data together with the value representing the time information of the frame timing signal through compression, packing, coding and modulation, etc.
  • the video data and the values sent together are obtained through demodulation, decoding, video decompression, etc. Subsequently, the receiving end can determine the local time t based on the value, and then display the sub-frame level on the display screen after a fixed delay T.
  • the embodiment of the present invention includes the time information of the frame timing signal while sending the video data at the transmitting end, so that the receiving end can determine the display timing based on the preset delay time.
  • the embodiment of the present invention not only uses the sub-frame level transmission mode, but also uses the sub-frame level display mode to ensure the minimum delay time and also overcome the influence of timing drift.
  • the black bold arrow represents the transmission process of video data
  • the black thin dashed arrow represents the transmission and determination process of corresponding time information.
  • the "parameter T" shown at the receiving end in FIG. 4 is a fixed delay time preset before the video data transmission.
  • the frame timing of the sending end is recorded and sent to the receiving end, and the receiving end restores the frame timing of the sending end and adjusts the LCD screen refreshing at the sub-frame level according to the preset fixed delay time.
  • the frame timing makes it possible to start the refreshing display when the received data of the frame is at the right moment, which reduces the delay of the video display on the screen, thereby reducing the delay of the entire image transmission system.
  • the start time of refreshing the screen is adjusted according to the frame timing of the sending end, avoiding the jitter and drift of the frame timing of the sending end and the frame timing displayed on the LCD of the receiving end caused by clock asynchronous, avoiding the display frame dropping and frame skipping, and get In order to achieve low latency of transmission.
  • the embodiment of the present invention does not limit the specific devices of the sending end and the receiving end.
  • the sending end and the receiving end may be two independent devices, and the two may be located in the same physical space or in different physical spaces, and they can communicate in a wired or wireless manner.
  • the sending end and the receiving end can be integrated in one physical device and belong to two different modules.
  • data transmission can be directly or indirectly performed between the sending end and the receiving end.
  • an embodiment of the present invention also provides a device for video display.
  • the device may be a receiving end of sub-frame level display, and the device 20 shown in FIG. 5 includes a receiving unit 210, The first determining unit 220, the second determining unit 230, and the processing unit 240.
  • the receiving unit 210 is configured to receive a data packet from the sending end, the data packet including sub-frame level video data and time information of the frame timing signal;
  • the first determining unit 220 is configured to determine the local time corresponding to the time information according to the time information and the timing relationship between the sending end and the receiving end;
  • the second determining unit 230 is configured to determine the timing signal for refreshing the screen according to the local time and the preset delay time, where the delay time is preset at the receiving end according to the delay of each level of processing at the subframe level ;
  • the processing unit 240 is configured to start the current frame refresh according to the timing signal.
  • the preset delay time is the sum of the delays of various levels of processing at the sub-frame level.
  • all levels of processing can include: image processing, video compression, physical layer transmission, and video decoding.
  • the time information is the value of the timing counter of the physical layer of the sending end when the sending end generates the frame timing signal of the video data output.
  • the timing relationship represents synchronization between the wireless communication physical layer of the receiving end and the wireless communication physical layer of the transmitting end.
  • the second determining unit 230 may be specifically configured to: generate a timing signal for refreshing the screen at time t+T, where t represents the local time, and T represents the delay time. Among them, the delay time T is the delay at the sub-frame level.
  • the device shown in FIG. 5 can be used to implement each step of the method for video display shown in FIG. 2. To avoid repetition, details are not described herein again.
  • the embodiment of the present invention also provides another device for video display, including a memory, a processor, and a computer program stored on the memory and running on the processor.
  • a processor executes the program, The steps of the method for video display shown in FIG. 2 are implemented.
  • the device 30 may include a memory 310 and a processor 320.
  • the memory 310 stores computer program codes for implementing corresponding steps in the method for video display according to an embodiment of the present invention.
  • the processor 320 is configured to run the computer program code stored in the memory 310 to execute the corresponding steps of the method for video display according to the embodiment of the present invention.
  • the following steps are performed when the computer program code is run by the processor 320: receiving a data packet from the sending end, the data packet including sub-frame level video data and time information of the frame timing signal; according to the time information and The timing relationship between the sending end and the receiving end determines the local time corresponding to the time information; according to the local time and the preset delay time, the timing signal for refreshing the screen is determined, where the delay time is based on each level of the subframe level The processing delay is preset at the receiving end; according to the timing signal, the current frame refresh is started.
  • the preset delay time is the sum of the delays of various levels of processing at the sub-frame level.
  • all levels of processing can include: image processing, video compression, physical layer transmission, and video decoding.
  • the time information is the value of the timing counter of the physical layer of the sending end when the sending end generates the frame timing signal of the video data output.
  • the timing relationship represents synchronization between the wireless communication physical layer of the receiving end and the wireless communication physical layer of the transmitting end.
  • the processor 320 may be specifically configured to: generate a timing signal for refreshing the screen at time t+T, where t represents the local time, and T represents the delay time. Among them, the delay time T is the delay at the sub-frame level.
  • the device 30 shown in FIG. 6 may be a receiving end of sub-frame level display, which can be used to implement each step of the method for video display shown in FIG. 2. In order to avoid repetition, it will not be repeated here.
  • the embodiment of the present invention also provides a computer storage medium on which a computer program is stored.
  • the computer program is executed by the processor, the steps of the method for video display shown in FIG. 2 can be realized.
  • the computer storage medium is a computer-readable storage medium.
  • the computer program instructions when run by the computer or processor, cause the computer or processor to perform the following steps: receive a data packet from the sending end, and the data packet includes sub-frame level video data and frame timing signals. Time information; according to the time information and the timing relationship between the sending end and the receiving end, determine the local time corresponding to the time information; according to the local time and the preset delay time, determine the timing signal for refreshing the screen, where the delay time It is preset at the receiving end according to the delay of each level of processing at the sub-frame level; according to the timing signal, the current frame refresh is started.
  • the computer storage medium may include, for example, a memory card of a smart phone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory ( CD-ROM), USB memory, or any combination of the above storage media.
  • the computer-readable storage medium may be any combination of one or more computer-readable storage media.
  • an embodiment of the present invention also provides a computer program product, which contains instructions, which when executed by a computer, cause the computer to execute the steps of the method for video display shown in FIG. 2.
  • the computer executes: receiving a data packet from the sending end, the data packet including sub-frame level video data and time information of the frame timing signal; according to the time information and sending The timing relationship between the terminal and the receiving terminal determines the local time corresponding to the time information; according to the local time and the preset delay time, the timing signal for refreshing the screen is determined, where the delay time is processed according to each level of the subframe level The delay is preset at the receiving end; according to the timing signal, the current frame refresh is started.
  • sub-frame level control is adopted for the display refreshing of the receiving end. After the time of the frame timing signal of the sending end, a fixed delay time is delayed to generate the frame timing of the refreshing display, which can avoid the time delay. Asynchrony causes a long wait to achieve the minimum display delay.
  • the entire image transmission system adopts sub-frame level control from the video stream generation, image processing, video compression, wireless transmission, and video decompression processes, and the start time of refreshing the screen is adjusted according to the frame timing of the sender, avoiding The jitter and drift of the frame timing of the transmitting end and the frame timing displayed on the LCD of the receiving end caused by the clock asynchronous avoids the displayed frame loss and frame skipping, and obtains low transmission delay.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk (SSD)), etc. .
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processor, or each unit may exist alone physically, or two or more units may be integrated into one unit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Procédé et appareil d'affichage vidéo, et support d'enregistrement informatique. Le procédé est un procédé d'affichage de niveau de sous-trame, et comprend les étapes suivantes : un terminal de réception reçoit un paquet de données en provenance d'un terminal de transmission, le paquet de données comprenant des données vidéo de niveau de sous-trame et des informations de temps d'un signal de synchronisation de trame (S110); détermine un temps local correspondant aux informations de temps selon les informations de temps et une relation de synchronisation entre le terminal de transmission et le terminal de réception (S120); détermine le signal de synchronisation pour un rafraîchissement d'écran en fonction du temps local et d'un temps de retard prédéfini, le temps de retard étant préréglé au niveau du terminal de réception selon des retards de traitement à différents niveaux de sous-trame (S130); et démarre le rafraîchissement d'écran de trame en cours en fonction du signal de synchronisation (S140). Après le temps du signal de synchronisation de trame du terminal de transmission, le retard est réalisé par un temps de retard fixe pour générer une synchronisation de trame pour un affichage de rafraîchissement d'écran. Une telle commande de niveau de sous-trame pour afficher un rafraîchissement d'écran peut éviter une longue attente provoquée par l'asynchronisation et obtenir un retard d'affichage minimal.
PCT/CN2019/126722 2019-12-19 2019-12-19 Procédé et appareil d'affichage vidéo, et support d'enregistrement informatique WO2021120124A1 (fr)

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Application Number Priority Date Filing Date Title
CN201980091613.1A CN113424487B (zh) 2019-12-19 2019-12-19 用于视频显示的方法、装置及计算机存储介质
PCT/CN2019/126722 WO2021120124A1 (fr) 2019-12-19 2019-12-19 Procédé et appareil d'affichage vidéo, et support d'enregistrement informatique

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PCT/CN2019/126722 WO2021120124A1 (fr) 2019-12-19 2019-12-19 Procédé et appareil d'affichage vidéo, et support d'enregistrement informatique

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