WO2021119967A1 - 一种拼接墙视频信号同步方法、装置和系统 - Google Patents

一种拼接墙视频信号同步方法、装置和系统 Download PDF

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Publication number
WO2021119967A1
WO2021119967A1 PCT/CN2019/125799 CN2019125799W WO2021119967A1 WO 2021119967 A1 WO2021119967 A1 WO 2021119967A1 CN 2019125799 W CN2019125799 W CN 2019125799W WO 2021119967 A1 WO2021119967 A1 WO 2021119967A1
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signal
synchronization
image data
image
output
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PCT/CN2019/125799
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English (en)
French (fr)
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胡庆荣
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威创集团股份有限公司
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Priority to CN201980003220.0A priority Critical patent/CN111133741B/zh
Priority to PCT/CN2019/125799 priority patent/WO2021119967A1/zh
Publication of WO2021119967A1 publication Critical patent/WO2021119967A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • 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
    • H04N5/2624—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 for obtaining an image which is composed of whole input images, e.g. splitscreen

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  • This application relates to the technical field of signal processing, and in particular to a method, device and system for synchronizing video signals of a splicing wall.
  • the splicing wall is formed by splicing multiple display units, and the splicing display method of the image is to transmit the image signal to each display unit in a cascaded manner, and display the image signal after processing the image signal through the display unit.
  • the splicing display method of the image is to transmit the image signal to each display unit in a cascaded manner, and display the image signal after processing the image signal through the display unit.
  • all display units are connected by a synchronization line.
  • the synchronization signal is transmitted, and each display unit outputs and displays according to the synchronization signal, thereby achieving synchronization.
  • the sync line currently in use is a BNC line.
  • the sync signal transmitted through the BNC line is a periodic pulse signal whose period is the display frame rate. For example, if the display frame rate of a splicing wall is 60Hz, the sync signal is a 60Hz pulse signal.
  • the existing splicing wall signal is synchronized by BNC as shown in Figure 1.
  • the input image signal is also connected to each display unit.
  • the first display unit of the splicing wall When the synchronization signal is input, the first display unit of the splicing wall generates a synchronization signal, which is transmitted to all display units through the BNC cable.
  • the image When there is an external synchronization signal input, such as when a camera takes an image, the image is transmitted to the splicing wall.
  • the camera outputs a synchronization signal, and the synchronization signal output by the camera is an external synchronization signal.
  • the external synchronization signal is input to the first display unit, and the first display unit is transmitted to all display units through the BNC cable.
  • the synchronization line If the synchronization line is not connected properly, the display of the display units on the splicing wall will be out of sync, which will affect the stability of the splicing wall system.
  • This application provides a method, device and system for synchronously displaying video signals of a splicing wall, which is used to solve the problem that the existing splicing wall system needs to use synchronization lines to transmit synchronization signals in each display unit of the splicing wall to achieve signal synchronization. There are too many lines, and the abnormal connection of the synchronization line will cause the display of the display units on the splicing wall to be out of sync, which affects the technical problem of the stability of the splicing wall system.
  • the first aspect of the present application provides a method for synchronously displaying splicing wall signals, including:
  • the target image data of the image data signal as a synchronization flag in the input image signal, and the image signal includes a field synchronization signal, a line synchronization signal, a data valid signal and an image data signal;
  • the output synchronization signal is pulled high at the position of the synchronization flag bit. If the output synchronization signal is at the high level position of the data valid signal, then Use the neighboring pixel replacement method to replace the synchronization flag bit with neighboring pixels; otherwise, no action is taken;
  • the selecting target image data of the image data signal from the input image signal as the synchronization flag bit under the triggering of the synchronization signal includes:
  • One image data of the image data signal is randomly selected as the synchronization flag from the input image signal.
  • the step of inserting the synchronization flag bit into the position of the image data signal corresponding to the acquired rising edge moment of the output synchronization signal before further includes:
  • Detect whether there is an external synchronization signal input if so, use the external synchronization signal as the output synchronization signal, otherwise, trigger the first display unit of the splicing wall to generate a synchronization signal, and use the output generated by the first display unit to generate a synchronization signal.
  • the synchronization signal is used as the output synchronization signal.
  • the image data signal after the field synchronization signal, the line synchronization signal, the data valid signal, and the adjacent pixel replacement method are used to replace the synchronization flag bit with adjacent pixels is input to the image
  • the splicing processing channel performs synchronous output, including:
  • the image data signal is transmitted in the form of RGB 4:4:4 data.
  • a second aspect of the present application provides a video signal synchronization device for a splicing wall, including:
  • the flag unit is used to select the target image data of the image data signal as a synchronization flag bit from the input image signal, the image signal includes a field synchronization signal, a line synchronization signal, a data valid signal and an image data signal;
  • a first replacement unit configured to replace the image data in the image data signal that is the same as the synchronization flag bit data with adjacent image data of the image data
  • An inserting unit configured to insert the synchronization flag at the position of the image data signal corresponding to the acquired rising edge of the output synchronization signal
  • the second replacement unit is used to pull the output synchronization signal high at the position of the synchronization flag after the receiving end receives the image signal inserted into the synchronization flag bit, if the output synchronization signal is in the data valid signal
  • the high-level position of, the adjacent pixel replacement method is used to replace the synchronization flag bit with an adjacent pixel, otherwise, no action is taken;
  • An output unit for inputting the field synchronization signal, the line synchronization signal, the data valid signal, and the image data signal after the synchronization flag bit is replaced with adjacent pixels by the adjacent pixel replacement method to image stitching The processing channel performs synchronous output.
  • the marking unit is specifically used for:
  • the output unit is specifically used for:
  • it further includes: a detection unit;
  • the detection unit is used to detect whether there is an external synchronization signal input, if so, the external synchronization signal is used as the output synchronization signal, otherwise, the first display unit of the splicing wall is triggered to generate a synchronization signal, and the The synchronization signal generated by the first display unit is used as the output synchronization signal.
  • the third aspect of the present application provides a video signal synchronization system for a splicing wall, including: a sending end and a receiving end;
  • the sending end includes a marking unit, a first replacement unit, and an insertion unit of any video signal synchronization device of a splicing wall described in the second aspect;
  • the receiving end includes the second replacement unit and the output unit of any video signal synchronization device of the splicing wall described in the second aspect.
  • the sending end further includes a detection unit of the video signal synchronization device of the splicing wall described in the second aspect.
  • a video signal synchronization method for a mosaic wall which includes: selecting target image data of an image data signal as a synchronization flag from an input image signal.
  • the image signal includes a field synchronization signal, a line synchronization signal, and a data valid signal.
  • the image data signal; the image data in the image data signal that is the same as the synchronization flag bit data is replaced with the adjacent image data of the image data; the image data signal position corresponding to the rising edge of the acquired output synchronization signal is inserted Synchronization flag bit; after the receiving end receives the image signal with the synchronization flag bit inserted, the output synchronization signal is pulled high at the position of the synchronization flag bit.
  • the processing channel performs synchronous output.
  • the image data is selected as the flag bit of the synchronization signal in the image data signal, and the replacement image data is embedded in the image data signal and sent to the receiving end.
  • the receiving end receives the embedded synchronization flag bit.
  • the output synchronization signal is restored, and then the adjacent pixel replacement method is used to replace the synchronization flag with adjacent pixels at the high level position of the data valid signal, and the field synchronization signal, line synchronization signal, data valid signal and adjacent pixels are used
  • the replacement method the image data signal after the synchronization flag is replaced with adjacent pixels is input to the image splicing processing channel for synchronization output, thereby realizing the synchronization display of the splicing wall signal.
  • the synchronization display method does not need to use a synchronization line and does not need to be on the splicing wall.
  • the use of synchronization lines avoids the stability problems caused by the abnormal connection of the splicing wall synchronization line, and solves the problem that the existing splicing wall system needs to use the synchronization line to transmit the synchronization signal in each display unit of the splicing wall to achieve signal synchronization. There are too many lines. When the synchronization line is not connected properly, the display unit on the splicing wall will be out of sync, which affects the technical problem of the stability of the splicing wall system. It also reduces the cost of using the synchronization line and solves the problem of the splicing wall. The cost of the system.
  • Fig. 1 is a cascading manner of output synchronization signals and image signals in the prior art
  • FIG. 2 is a schematic flowchart of a video signal synchronization method for a mosaic wall provided in an embodiment of the application;
  • FIG. 3 is a schematic diagram of synchronization embedded in image data in the video signal synchronization method of the mosaic wall provided in an embodiment of the application;
  • FIG. 4 is a schematic diagram of effective image data restoration in the video signal synchronization method of the mosaic wall provided in an embodiment of the application;
  • FIG. 5 is a schematic structural diagram of a video signal synchronization device for a splicing wall provided in an embodiment of the application;
  • FIG. 6 is a schematic structural diagram of the transmitting end of a video signal synchronization system for a splicing wall provided in an embodiment of the application;
  • FIG. 7 is a schematic structural diagram of a receiving end in a video signal synchronization system of a mosaic wall provided in an embodiment of the application.
  • an embodiment of a video signal synchronization method for a video wall provided by the present application includes:
  • Step 101 Select the target image data of the image data signal as a synchronization flag from the input image signal.
  • the image signal includes a field synchronization signal, a line synchronization signal, a data valid signal and an image data signal.
  • the video image signal includes a field synchronization signal VS, a line synchronization signal HS, a data valid signal DE, and an image data signal Data.
  • the embodiment of the present application is based on a video signal-level connection-based splicing wall synchronization method , Embed the output synchronization signal into the cascaded video signal, thereby reducing the use of cables on the splicing wall and increasing the stability of the splicing wall.
  • the target image data is selected as the synchronization flag in the image data signal.
  • a random selection method can be used for the selection of the synchronization flag. Any image data in the image data signal can be selected as the synchronization flag, or it can be selected from the image data signal according to the actual application. The image data at the preset position is used as the synchronization flag.
  • Step 102 Replace the image data in the image data signal that is the same as the synchronization flag bit data with adjacent image data of the image data.
  • RGB (4:4:4) 24-bit image data is used for description.
  • 0x000001 is almost black when displayed, which cannot be distinguished by the naked eye.
  • the red component of 0x000001 is only 1, and the red component bit 0 (0x000000) or bit 2 (0x000002) can be used to replace the color closest to the transmitted image.
  • Step 103 Insert a synchronization flag bit at the position of the image data signal corresponding to the acquired rising edge of the output synchronization signal.
  • the rising edge of the splicing wall synchronization signal needs to be detected.
  • the synchronization flag bit flag is inserted at the position of the image data signal corresponding to the rising edge clock of the splicing wall synchronization signal.
  • the splicing wall synchronization signal can be an external synchronization signal, it can also be a synchronization signal generated by the first display unit of the splicing wall. Therefore, in the embodiment of the present application, the method for acquiring the splicing wall synchronization signal is determined according to the following principles: Detect whether there is an external synchronization signal input, if so, use the external synchronization signal as the output synchronization signal, otherwise, trigger the first display unit of the splicing wall to generate a synchronization signal, and use the synchronization signal generated by the first display unit as the output synchronization signal .
  • Steps 101 to 103 are the execution process steps of the mosaic wall as the unit of the sending end after receiving the image signal.
  • the sending end unit sends the image signal with the synchronization flag bit inserted to the receiving end.
  • step 104 and step 105 are executed.
  • Step 104 After the receiving end receives the image signal with the synchronization flag inserted, the output synchronization signal is pulled high at the position of the synchronization flag. If the output synchronization signal is at the high level of the data valid signal, the adjacent pixel replacement method is adopted Replace the synchronization flag with adjacent pixels, otherwise, no action.
  • the output synchronization signal is pulled high, and the output synchronization remains low at other times to realize the recovery of the output synchronization signal.
  • the recovery of the image signal adopts the method of replacing adjacent pixels. As shown in Figure 4, if the synchronization flag signal appears when the data valid signal DE is invalid, it is at the low level of DE, and no processing is required at this time.
  • the synchronization flag When the signal appears when the DE is valid, that is, at the high level of the DE, the image data of the previous pixel or the next pixel is used to replace the synchronization flag. Because the image signal values of adjacent pixels are very close, the human eye cannot distinguish between An image in which individual pixels on a frame of image are replaced with adjacent pixels, so it will not affect the display effect of the image.
  • Step 105 Input the field synchronization signal, the line synchronization signal, the data valid signal and the image data signal after replacing the synchronization flag with the adjacent pixels by the adjacent pixel replacement method to the image stitching processing channel for synchronous output.
  • the field synchronization signal, the line synchronization signal, the data valid signal and the image data signal after the adjacent pixel is replaced by the adjacent pixel replacement method to the synchronization flag bit are input to the image stitching processing channel.
  • the image stitching processing channel can perform image cutting, scaling and frame rate switching processing, and the restored output synchronization signal is used to control the output of the frame rate conversion in the image stitching processing channel, so that the displayed image frames are output in synchronization.
  • each display unit on the splicing wall is independent when processing image signals, the image signal of a window should be displayed at any size on any position on the wall, and each display unit needs to receive the input signal
  • the corresponding image block is cut up, and scaled according to the size of the window. It is also necessary to perform frame rate conversion according to the refresh rate of the display unit and then output and display. Since each display unit performs signal processing independently, it will cause the display between the display units to be out of sync and the screen torn during display. Therefore, a synchronization signal is required to connect all display units in series, and all display units are synchronized when displaying images. The rhythm of the signal is displayed synchronously.
  • the image processing performed by the image stitching processing channel belongs to the existing means, which is not an improvement point of the embodiment of the present application, and will not be repeated here.
  • the image data is selected as the flag bit of the synchronization signal in the image data signal, and the replacement image data is embedded in the image data signal and sent to the receiving end.
  • the receiving end receives the embedded synchronization flag
  • the output synchronization signal is restored, and then the adjacent pixel replacement method is used to replace the synchronization flag with adjacent pixels at the high level position of the data valid signal, and the field synchronization signal, line synchronization signal, data valid signal and the use of
  • the image data signal after the synchronization flag is replaced with adjacent pixels is input to the image stitching processing channel for synchronous output, thereby realizing the synchronous display of the mosaic wall signal.
  • the synchronous display method does not need to use a synchronization line, and does not need to be spliced.
  • the use of synchronization lines on the wall avoids the stability problems caused by the abnormal connection of the splicing wall synchronization line, and solves the need for the existing splicing wall system to use the synchronization line to transmit the synchronization signal in the various display units of the splicing wall to achieve signal synchronization and splicing.
  • FIG. 5 an embodiment of a video signal synchronization device for a splicing wall is provided in an embodiment of the present application, including:
  • the flag unit is used to select the target image data of the image data signal as a synchronization flag from the input image signal.
  • the image signal includes a field synchronization signal, a line synchronization signal, a data valid signal and an image data signal.
  • the first replacement unit is used to replace the image data in the image data signal that is the same as the synchronization flag bit data with adjacent image data of the image data.
  • the inserting unit is used to insert a synchronization flag bit at the position of the image data signal corresponding to the obtained rising edge of the output synchronization signal.
  • the second replacement unit is used to pull the output synchronization signal high at the position of the synchronization flag after receiving the image signal with the synchronization flag inserted at the receiving end. If the output synchronization signal is at the high level position of the data valid signal, use The adjacent pixel replacement method replaces the synchronization flag bit with adjacent pixels, otherwise, no action is taken.
  • the output unit is used to input the field synchronization signal, the line synchronization signal, the data valid signal and the image data signal after the synchronization flag bit is replaced with the adjacent pixels by the adjacent pixel replacement method to the image stitching processing channel for synchronous output.
  • marking unit is specifically used for:
  • One image data of the image data signal is randomly selected as the synchronization flag from the input image signal.
  • the output unit is specifically used for:
  • the field synchronization signal, line synchronization signal, data valid signal and the image data signal after replacing the synchronization flag with adjacent pixels by the adjacent pixel replacement method are input to the image stitching processing channel for cutting, scaling and frame rate conversion processing, so that the image The image frame of the signal is output synchronously.
  • a detection unit Also includes: a detection unit;
  • the detection unit is used to detect whether there is an external synchronization signal input, if so, the external synchronization signal is used as the output synchronization signal, otherwise, the first display unit of the splicing wall is triggered to generate a synchronization signal, and the synchronization signal generated by the first display unit is synchronized The signal is used as an output synchronization signal.
  • This application provides an embodiment of a video signal synchronization system for a mosaic wall, including: a sending end and a receiving end;
  • the sending end includes the marking unit, the first replacement unit, and the insertion unit of the video signal synchronization device of the video wall video signal synchronization device in the foregoing embodiment of the video signal synchronization device of the video wall video signal;
  • the receiving end includes the second replacement unit and the output unit of the video signal synchronization device of the video wall video signal synchronization device in the foregoing embodiment of the video signal video signal synchronization device of the video video wall.
  • the sending end also includes the detection unit of the video signal synchronization device of the video wall video signal synchronization device in the foregoing embodiment of the video signal video signal synchronization device of the video video wall video signal synchronization device.
  • FIG. 6 is a schematic diagram of the architecture of the transmitting end in an embodiment of the application
  • FIG. 7 is a schematic diagram of the architecture of the receiving end in an embodiment of the application.
  • the working principle of the video signal synchronization system of the splicing wall provided in the embodiment of the application can be Briefly: the detection unit at the sending end is used to detect whether there is an external synchronization signal input, if so, the external synchronization signal is used as the output synchronization signal, otherwise, the first display unit of the splicing wall is triggered to generate a synchronization signal, and the first The synchronization signal generated by the display unit is used as the output synchronization signal.
  • the target image data of the image data signal is selected as the synchronization flag in the input image signal, and the image data in the image data signal that is the same as the synchronization flag data are used as adjacent to the image data.
  • Image data replacement insert the synchronization flag at the position of the image data signal corresponding to the rising edge of the output synchronization signal, and then output the image signal to the receiving end; after the receiving end receives the image signal with the synchronization flag inserted, the synchronization flag is The position of the output synchronization signal will be pulled high, and the output synchronization at other times will remain low to realize the recovery of the output synchronization signal.
  • the adjacent pixel replacement method is used to adjust the synchronization flag bit Replace with adjacent pixels, otherwise, no action.
  • the field sync signal, line sync signal, data valid signal and the image data signal after replacing the sync flag bit with adjacent pixels using the adjacent pixel replacement method are input to the image stitching processing channel for synchronization Output.
  • the disclosed device and method may 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 processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer system (which can be a personal computer, a server, or a network system, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (English full name: Read-Only Memory, English abbreviation: ROM), random access memory (English full name: Random Access Memory, English abbreviation: RAM), magnetic Various media that can store program codes, such as discs or optical discs.

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Abstract

本申请公开了一种拼接墙视频信号同步方法、装置和系统，在图像数据信号中选取图像数据作为同步信号的标志位，替换图像数据嵌入到图像数据信号中，发送到接收端。接收端接收到嵌入同步标志位的图像信号后，进行输出同步信号恢复，然后在数据有效信号的高电平位置采用临近像素替换法对同步标志位替换为临近像素，将图像信号进行同步输出，从而实现了拼接墙信号的同步显示，解决了现有的拼接墙系统需要使用同步线在拼接墙的各个显示单元中传输同步信号实现信号同步，拼接墙上的线路较多，同步线连接不正常时会造成拼接墙上各显示单元显示不同步，影响拼接墙系统的稳定性的技术问题。同时减少了使用同步线带来的成本，解决了拼接墙系统的成本问题。

Description

一种拼接墙视频信号同步方法、装置和系统 技术领域
本申请涉及信号处理技术领域，尤其涉及一种拼接墙视频信号同步方法、装置和系统。
背景技术
拼接墙由多个显示单元拼接而成，图像的拼接显示方式是将图像信号通过级联的方式传输到各个显示单元，并通过显示单元进行图像信号处理后进行显示。在拼接墙系统中，为了保证每个显示单元输出显示的图像帧是同步的，以及实现每个单元显示的图像帧与播放图像的同步，所有的显示单元通过一根同步线连接，同步线上传输同步信号，每个显示单元按同步信号进行输出显示，从而实现同步。
目前使用的同步线是BNC线，通过BNC线传输的同步信号是一个周期脉冲信号，其周期即显示的帧率，例如拼接墙的显示帧率为60Hz，则同步信号就是60Hz的脉冲信号。现有的拼接墙信号通过BNC同步的方式如图1所示，在拼接墙上除了BNC线连接各个单元，还有用于将输入图像信号级联的信号线也连接着各个显示单元，在没有外部同步信号输入时，由拼接墙的第一个显示单元产生同步信号，通过BNC线传输到所有的显示单元，在有外部同步信号输入时，例如摄影机拍摄图像，将图像传输至拼接墙时，由摄影机输出同步信号，摄影机输出的同步信号即为外部同步信号，将外部输入的同步信号输入第一个显示单元，由第一个显示单元通过BNC线传输到所有的显示单元。但是拼接墙上的线路较多，同步线连接不正常时会造成拼接墙上各显示单元显示不同步，影响拼接墙系统的稳定性。
发明内容
本申请提供了一种拼接墙视频信号同步显示方法、装置和系统，用于解决现有的拼接墙系统需要使用同步线在拼接墙的各个显示单元中传输同步信号实现信号同步，拼接墙上的线路较多，同步线连接不正常时会造成拼接墙上各显示单元显示不同步，影响拼接墙系统的稳定性的技术问题。
有鉴于此，本申请第一方面提供了一种拼接墙信号同步显示方法，包括：
在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，所述图像信号包括场同步信号、行同步信号、数据有效信号和图像数据信号；
将所述图像数据信号中的与所述同步标志位数据相同的图像数据分别用与所述图像数据的相邻图像数据替换；
在获取到的输出同步信号的上升沿时刻对应的所述图像数据信号位置插入所述同步标志位；
在接收端接收到插入所述同步标志位的图像信号之后，在所述同步标志位的位置将输出同步信号拉高，若所述输出同步信号处于所述数据有效信号的高电平位置，则采用临近像素替换法对所述同步标志位替换为临近像素，否则，不动作；
将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
可选地，所述在同步信号触发下，所述在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，包括：
在输入的图像信号中随机选取图像数据信号的一个图像数据作为同步标志位。
可选地，所述在获取到的输出同步信号的上升沿时刻对应的所述图像数据信号位置插入所述同步标志位，之前还包括：
检测是否有外同步信号输入，若有，则将所述外同步信号作为所述输出同步信号，否则，触发拼接墙的第一个显示单元生成同步信号，将所述第一个显示单元生成的同步信号作为所述输出同步信号。
可选地，所述将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出，包括：
将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行剪切、缩放和帧率转换处理，使得所述图像信号的图像帧同 步输出。
可选地，所述图像数据信号以RGB 4:4:4的数据形式传输。
本申请第二方面提供了一种拼接墙视频信号同步装置，包括：
标志单元，用于在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，所述图像信号包括场同步信号、行同步信号、数据有效信号和图像数据信号；
第一替换单元，用于将所述图像数据信号中的与所述同步标志位数据相同的图像数据分别用与所述图像数据的相邻图像数据替换；
插入单元，用于在获取到的输出同步信号的上升沿时刻对应的所述图像数据信号位置插入所述同步标志位；
第二替换单元，用于在接收端接收到插入所述同步标志位的图像信号之后，在所述同步标志位的位置将输出同步信号拉高，若所述输出同步信号处于所述数据有效信号的高电平位置，则采用临近像素替换法对所述同步标志位替换为临近像素，否则，不动作；
输出单元，用于将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
可选地，所述标志单元具体用于：
在输入的图像信号中随机选取图像数据信号的一个图像数据作为同步标志位；
所述输出单元具体用于：
将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行剪切、缩放和帧率转换处理，使得所述图像信号的图像帧同步输出。
可选地,还包括：检测单元；
所述检测单元，用于检测是否有外同步信号输入，若有，则将所述外同步信号作为所述输出同步信号，否则，触发拼接墙的第一个显示单元生成同步信号，将所述第一个显示单元生成的同步信号作为所述输出同步信号。
本申请第三方面提供了一种拼接墙视频信号同步系统，包括：发送端和接收端；
所述发送端包括第二方面所述的任一种拼接墙视频信号同步装置的标志单元、第一替换单元和插入单元；
所述接收端包括第二方面所述的任一种拼接墙视频信号同步装置的第二替换单元和输出单元。
可选地，所述发送端还包括第二方面所述的拼接墙视频信号同步装置的检测单元。
从以上技术方案可以看出，本申请实施例具有以下优点：
本申请中，提供了一种拼接墙视频信号同步方法，包括：在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，图像信号包括场同步信号、行同步信号、数据有效信号和图像数据信号；将图像数据信号中的与同步标志位数据相同的图像数据分别用与图像数据的相邻图像数据替换；在获取到的输出同步信号的上升沿时刻对应的图像数据信号位置插入同步标志位；在接收端接收到插入同步标志位的图像信号之后，在同步标志位的位置将输出同步信号拉高，若输出同步信号处于数据有效信号的高电平位置，则采用临近像素替换法对同步标志位替换为临近像素，否则，不动作；将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
本申请提供的拼接墙视频信号同步方法，在图像数据信号中选取图像数据作为同步信号的标志位，替换图像数据嵌入到图像数据信号中，发送到接收端，接收端接收到嵌入同步标志位的图像信号之后，进行输出同步信号恢复，然后在数据有效信号的高电平位置采用临近像素替换法对同步标志位替换为临近像素，将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出，从而实现了拼接墙信号的同步显示，同步显示方式不需要使用同步线，不需要在拼接墙上使用同步线，避免了拼接墙同步线连接不正常带来的稳定性问题，解决了现有的拼接墙系统需要使用同步线在拼接墙的各个显示单元中传输同步信号实现信号同步，拼接墙上的线路较多，同步线连接不正常时会造成 拼接墙上各显示单元显示不同步，影响拼接墙系统的稳定性的技术问题，同时也减少了使用同步线带来的成本，解决了拼接墙系统的成本问题。
附图说明
图1为现有技术中的输出同步信号和图像信号级联方式；
图2为本申请实施例中提供的一种拼接墙视频信号同步方法的一个流程示意图；
图3为本申请实施例中提供的拼接墙视频信号同步方法中同步在图像数据中嵌入的示意图；
图4为本申请实施例中提供的拼接墙视频信号同步方法中有效图像数据恢复的示意图；
图5为本申请实施例中提供的一种拼接墙视频信号同步装置的一个结构示意图；
图6为本申请实施例中提供的一种拼接墙视频信号同步系统的发送端的结构示意图；
图7为本申请实施例中提供的一种拼接墙视频信号同步系统中的接收端的结构示意图。
具体实施方式
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
为了便于理解，请参阅图1至图3，本申请提供的一种拼接墙视频信号同步方法的一个实施例，包括：
步骤101、在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，图像信号包括场同步信号、行同步信号、数据有效信号和图像数据 信号。
需要说明的是，如图3所示，视频图像信号包括场同步信号VS、行同步信号HS、数据有效信号DE和图像数据信号Data，本申请实施例基于视频信号级连线的拼接墙同步方法，将输出同步信号嵌入到级连的视频信号中，从而减少拼接墙上线缆的使用，增加拼接墙的稳定性。在图像信号输入拼接墙后，在图像数据信号中选取目标图像数据作为同步标志位。
还需要说明的是，对于同步标志位的选取，可以采用随机性选取方法，在图像数据信号中任意选择一个图像数据作为同步标志位，也可以根据实际应用，根据实际需要从图像数据信号中选取预置位置的图像数据来作为同步标志位。
步骤102、将图像数据信号中的与同步标志位数据相同的图像数据分别用与图像数据的相邻图像数据替换。
需要说明的是，图像数据的传输形式有多种，如RGB(4:4:4)、YCbCr(4:4:4)和YCbCr(4:2:2)等，不管采用哪种形式传输，都可以采用本申请实施例中的方法来实现同步。本申请实施例中以RGB(4:4:4)，24位的图像数据来进行说明。在图像数据中选取图像数据0x000001作为同步标志位。为了不把图像数据信号中的本身出现的0x000001数据误判为同步标志，需要先对图像数据中的0x000001数据进行替换因为0x000001在显示时是几乎接近0x000000的黑色，肉眼无法分辨。0x000001的红色分量只有1，可以用红色分量位0(0x000000)或者位2(0x000002)的进行替换色彩最接近，对传输的图像影响最小。
步骤103、在获取到的输出同步信号的上升沿时刻对应的图像数据信号位置插入同步标志位。
需要说明的是，本申请实施例中，需要检测拼接墙同步信号的上升沿，如图3所示，在拼接墙同步信号的上升沿时钟对应位图像数据信号位置插入同步标志位flag。
由于拼接墙同步信号可以是外同步信号，也可以是有拼接墙第一个显示单元生成的同步信号，因此，本申请实施例中，对于拼接墙同步信号的获取方法，依据以下原则进行确定：检测是否有外同步信号输入，若有，则将外同步信号 作为输出同步信号，否则，触发拼接墙的第一个显示单元生成同步信号，将第一个显示单元生成的同步信号作为输出同步信号。
步骤101至步骤103为拼接墙在接收到图像信号之后作为发送端的单元的执行过程步骤，在执行完步骤103之后，发送端单元将插入同步标志位flag后的图像信号发送给接收端，在接收端接收到图像信号之后，执行步骤104和步骤105。
步骤104、在接收端接收到插入同步标志位的图像信号之后，在同步标志位的位置将输出同步信号拉高，若输出同步信号处于数据有效信号的高电平位置，则采用临近像素替换法对同步标志位替换为临近像素，否则，不动作。
需要说明的是，当接收到同步标志位flag之后，即0x000001，将输出同步信号拉高，其他时候的输出同步保持低电平，实现输出同步信号的恢复。图像信号的恢复采用临近像素替换的方法，如图4所示，如果同步标志信号出现在数据有效信号DE无效的时候，即处于DE的低电平位置，此时不需要进行处理，当同步标志信号出现在DE有效的时候，即处于DE的高电平位置，则用上一个像素或下一个像素的图像数据替换同步标志位，因为相邻像素的图像信号值非常接近，人眼无法分辨在一帧图像上个别像素用相邻像素替换的图像，因此不会对图像的显示效果造成影响。
步骤105、将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
需要说明的是，本申请实施例中，最后将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换位临近像素后的图像数据信号输入到图像拼接处理通道，图像拼接处理通道可以进行图像剪切、缩放和帧率切换处理，恢复的输出同步信号用于控制图像拼接处理通道中帧率转换的输出，使得显示的图像帧按同步输出。对于拼接墙整体来说，由于拼接墙上每个显示单元在处理图像信号的时候是各自独立的，一个窗口的图像信号要在墙上的任意位置任意大小显示，每个显示单元需要从输入信号上剪切相应的图像块，并根据窗口的大小，进行缩放，还需要根据显示单元的刷新率进行帧率转换再输出显示。由于每个显示单元独立进行信号处理，在显示的时候就会造成 显示单元间显示的不同步，画面撕裂，所以需要一个同步信号串联所有的显示单元，所有显示单元在显示图像的时候按同步信号的节奏进行同步显示。对于图像拼接处理通道进行的图像处理属于现有的手段，非本申请实施例的改进点，在此不再进行指赘述。
本申请实施例提供的拼接墙视频信号同步方法，在图像数据信号中选取图像数据作为同步信号的标志位，替换图像数据嵌入到图像数据信号中，发送到接收端，接收端接收到嵌入同步标志位的图像信号之后，进行输出同步信号恢复，然后在数据有效信号的高电平位置采用临近像素替换法对同步标志位替换为临近像素，将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出，从而实现了拼接墙信号的同步显示，同步显示方式不需要使用同步线，不需要在拼接墙上使用同步线，避免了拼接墙同步线连接不正常带来的稳定性问题，解决了现有的拼接墙系统需要使用同步线在拼接墙的各个显示单元中传输同步信号实现信号同步，拼接墙上的线路较多，同步线连接不正常时会造成拼接墙上各显示单元显示不同步，影响拼接墙系统的稳定性的技术问题，同时也减少了使用同步线带来的成本，解决了拼接墙系统的成本问题。
为了便于理解，请参阅图5，本申请实施例中提供了一种拼接墙视频信号同步装置的实施例，包括：
标志单元，用于在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，图像信号包括场同步信号、行同步信号、数据有效信号和图像数据信号。
第一替换单元，用于将图像数据信号中的与同步标志位数据相同的图像数据分别用与图像数据的相邻图像数据替换。
插入单元，用于在获取到的输出同步信号的上升沿时刻对应的图像数据信号位置插入同步标志位。
第二替换单元，用于在接收端接收到插入同步标志位的图像信号之后，在同步标志位的位置将输出同步信号拉高，若输出同步信号处于数据有效信号的高电平位置，则采用临近像素替换法对同步标志位替换为临近像素，否则，不动作。
输出单元，用于将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
进一步地，标志单元具体用于：
在输入的图像信号中随机选取图像数据信号的一个图像数据作为同步标志位。
输出单元具体用于：
将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行剪切、缩放和帧率转换处理，使得图像信号的图像帧同步输出。
进一步地，还包括：检测单元；
检测单元，用于检测是否有外同步信号输入，若有，则将外同步信号作为输出同步信号，否则，触发拼接墙的第一个显示单元生成同步信号，将第一个显示单元生成的同步信号作为输出同步信号。
为了便于理解，请参阅图6和图7，本申请提供了一种拼接墙视频信号同步系统的实施例，包括：发送端和接收端；
发送端包括前述的拼接墙视频信号同步装置实施例中的拼接墙视频信号同步装置的标志单元、第一替换单元和插入单元；
接收端包括前述的拼接墙视频信号同步装置实施例中的拼接墙视频信号同步装置的第二替换单元和输出单元。
进一步地，发送端还包括前述的拼接墙视频信号同步装置实施例中的拼接墙视频信号同步装置的检测单元。
需要说明的是，图6为本申请实施例中的发送端的架构示意图，图7为本申请实施例中的接收端的架构示意图，本申请实施例中提供的拼接墙视频信号同步系统的工作原理可以简述为：发送端的检测单元用于检测是否有外同步信号输入，若有，则将外同步信号作为输出同步信号，否则，触发拼接墙的第一个显示单元生成同步信号，将第一个显示单元生成的同步信号作为输出同步信号。在图像信号输入发送端之后，在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，将图像数据信号中的与同步标志位数据相同的 图像数据分别用与图像数据的相邻图像数据替换，在输出同步信号的上升沿时刻对应的图像数据信号位置插入同步标志位，然后将图像信号输出至接收端；在接收端接收到插入同步标志位的图像信号之后，在同步标志位的位置将输出同步信号拉高，其他时候的输出同步保持低电平，实现输出同步信号的恢复，若输出同步信号处于数据有效信号的高电平位置，则采用临近像素替换法对同步标志位替换为临近像素，否则，不动作，最后将场同步信号、行同步信号、数据有效信号和采用临近像素替换法对同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机系统(可以是个人计算机，服务器，或者网络系统等)执行本申请各个实施例所述方法的全部或部分步骤。而前述 的存储介质包括：U盘、移动硬盘、只读存储器(英文全称：Read-Only Memory，英文缩写：ROM)、随机存取存储器(英文全称：Random Access Memory，英文缩写：RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (10)

  1. 一种拼接墙视频信号同步方法，其特征在于，包括：
    在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，所述图像信号包括场同步信号、行同步信号、数据有效信号和图像数据信号；
    将所述图像数据信号中的与所述同步标志位数据相同的图像数据分别用与所述图像数据的相邻图像数据替换；
    在获取到的输出同步信号的上升沿时刻对应的所述图像数据信号位置插入所述同步标志位；
    在接收端接收到插入所述同步标志位的图像信号之后，在所述同步标志位的位置将输出同步信号拉高，若所述输出同步信号处于所述数据有效信号的高电平位置，则采用临近像素替换法对所述同步标志位替换为临近像素，否则，不动作；
    将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
  2. 根据权利要求1所述的拼接墙视频信号同步方法，其特征在于，所述在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，包括：
    在输入的图像信号中随机选取图像数据信号的一个图像数据作为同步标志位。
  3. 根据权利要求1所述的拼接墙视频信号同步方法，其特征在于，所述在获取到的输出同步信号的上升沿时刻对应的所述图像数据信号位置插入所述同步标志位，之前还包括：
    检测是否有外同步信号输入，若有，则将所述外同步信号作为所述输出同步信号，否则，触发拼接墙的第一个显示单元生成同步信号，将所述第一个显示单元生成的同步信号作为所述输出同步信号。
  4. 根据权利要求1所述的拼接墙视频信号同步方法，其特征在于，所述将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临 近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出，包括：
    将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行剪切、缩放和帧率转换处理，使得所述图像信号的图像帧同步输出。
  5. 根据权利要求1所述的拼接墙视频信号同步方法，其特征在于，所述图像数据信号以RGB 4:4:4的数据形式传输。
  6. 一种拼接墙视频信号同步装置，其特征在于，包括：
    标志单元，用于在输入的图像信号中选取图像数据信号的目标图像数据作为同步标志位，所述图像信号包括场同步信号、行同步信号、数据有效信号和图像数据信号；
    第一替换单元，用于将所述图像数据信号中的与所述同步标志位数据相同的图像数据分别用与所述图像数据的相邻图像数据替换；
    插入单元，用于在获取到的输出同步信号的上升沿时刻对应的所述图像数据信号位置插入所述同步标志位；
    第二替换单元，用于在接收端接收到插入所述同步标志位的图像信号之后，在所述同步标志位的位置将输出同步信号拉高，若所述输出同步信号处于所述数据有效信号的高电平位置，则采用临近像素替换法对所述同步标志位替换为临近像素，否则，不动作；
    输出单元，用于将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行同步输出。
  7. 根据权利要求6所述的拼接墙视频信号同步方法，其特征在于，所述标志单元具体用于：
    在输入的图像信号中随机选取图像数据信号的一个图像数据作为同步标志位；
    所述输出单元具体用于：
    将所述场同步信号、所述行同步信号、所述数据有效信号和所述采用 临近像素替换法对所述同步标志位替换为临近像素后的图像数据信号输入到图像拼接处理通道进行剪切、缩放和帧率转换处理，使得所述图像信号的图像帧同步输出。
  8. 根据权利要求6所述的拼接墙视频信号同步方法，其特征在于，还包括：检测单元；
    所述检测单元，用于检测是否有外同步信号输入，若有，则将所述外同步信号作为所述输出同步信号，否则，触发拼接墙的第一个显示单元生成同步信号，将所述第一个显示单元生成的同步信号作为所述输出同步信号。
  9. 一种拼接墙视频信号同步系统，其特征在于，包括：发送端和接收端；
    所述发送端包括权利要求6-7中任一项所述的拼接墙视频信号同步装置的标志单元、第一替换单元和插入单元；
    所述接收端包括权利要求6-7中任一项所述的拼接墙视频信号同步装置的第二替换单元和输出单元。
  10. 根据权利要求9所述的拼接墙视频信号同步系统，其特征在于，所述发送端还包括权利要求8所述的拼接墙视频信号同步装置的检测单元。
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