CN111355861A - Multi-screen video synchronous splicing device and method - Google Patents
Multi-screen video synchronous splicing device and method Download PDFInfo
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- CN111355861A CN111355861A CN202010445706.4A CN202010445706A CN111355861A CN 111355861 A CN111355861 A CN 111355861A CN 202010445706 A CN202010445706 A CN 202010445706A CN 111355861 A CN111355861 A CN 111355861A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
Abstract
The embodiment of the invention discloses a multi-screen video synchronous splicing device and a method, the device comprises a video input acquisition module, a clock generation module, a video distribution module, a synchronous control module and a video receiving processing module, wherein the clock generation module provides homologous clock signals as clock signals of the video input acquisition module and the video receiving processing module, the video distribution module is used for generating a video distribution command according to user operation, the video input acquisition module is used for acquiring video signals of video sources and sending the acquired video signals to the video receiving processing module according to the received video distribution command, the video receiving processing module processes the received video signals according to the synchronous command of the synchronous control module and synchronously outputs the video signals to each display screen, under the command of the synchronous signals, the invention synchronously outputs the video signals to achieve multi-screen synchronous display, the switching picture is not blocked and has no tearing phenomenon.
Description
Technical Field
The invention relates to the technical field of image display, in particular to a multi-screen video synchronous splicing device and method.
Background
With the development of various display technologies, large-screen displays such as liquid crystal splicing, small-spacing LED screens, projection fusion screens and the like are increasingly applied to various use occasions, such as meeting rooms, exhibition and display, monitoring centers, command centers and the like. A large screen means that the size is increased and the resolution is increased, and the display interface currently mainly has the resolution of 1920 × 1080, 3840 × 2160, and the larger resolution needs to be spliced or fused by a plurality of small-resolution display devices, so as to obtain a larger display picture. In such a usage environment, the problem that the same video source is commonly displayed on a plurality of display devices is faced, and whether the pictures of the plurality of display devices are synchronous directly affects the overall appearance. Currently, to deal with the synchronization problem among multiple display devices, a method of multi-frame buffer (more than 3 frames) queue is generally adopted, and then video is compensated at the output end by adopting a frame insertion and frame loss mode. The method has the disadvantages that the buffer of the multi-frame images not only occupies a large buffer space, but also has poor video synchronization effect, and the phenomenon of tearing when pictures are switched among a plurality of display devices still exists.
Disclosure of Invention
Aiming at the technical problem, the invention provides a multi-screen video synchronous splicing device and method, which can synchronously output video signals to achieve multi-screen synchronous display, and the switching pictures are not blocked and torn.
The invention provides a multi-screen video synchronous splicing device which comprises a video input acquisition module, a clock generation module, a video distribution module, a synchronous control module and a video receiving and processing module, wherein the clock generation module provides homologous clock signals as clock signals of the video input acquisition module and the video receiving and processing module, the video distribution module is used for generating a video distribution command according to user operation, the video input acquisition module is used for acquiring video signals of video sources and sending the acquired video signals to the video receiving and processing module according to the received video distribution command, and the video receiving and processing module processes the received video signals according to a synchronous instruction of the synchronous control module and synchronously outputs the video signals to each display screen.
Optionally, the video allocation command includes at least one of video display area, display size and coordinate position information.
Optionally, the synchronization control module is configured to generate a synchronization instruction to synchronize the video output of the video receiving processing module.
Optionally, the video distribution module is further configured to provide a data channel from the video input acquisition module to the video receiving processing module.
Optionally, the video distribution module is further configured to cut and divide the position and size of the video source displayed in each video receiving and processing module according to the video distribution command.
Optionally, the clock generation module fans out a clock of the clock source out a plurality of clocks having the same frequency and the same phase as the source clock signal.
The invention also provides a multi-screen video synchronous splicing method, which comprises the following steps: the clock generation module generates homologous clock signals as clock signals of each module; the video distribution module generates a video distribution command according to user operation; the video input acquisition module acquires video signals of a video source and sends the acquired video signals to the video receiving and processing module according to the received video distribution command; and the video receiving and processing module processes the received video signals according to the synchronous instruction of the synchronous control module and synchronously outputs the processed video signals to each display screen.
Optionally, the video allocation command includes at least one of video display area, display size and coordinate position information.
Optionally, the step of generating a video distribution command according to a user operation further includes: and providing a data channel between the video input acquisition module and the video receiving processing module.
Optionally, the clock generation module fans out a clock of the clock source out a plurality of clocks having the same frequency and the same phase as the source clock signal.
In the technical scheme provided by the invention, a video distribution module is used for generating a video distribution command according to user operation, a video input acquisition module is used for acquiring video signals of a video source and sending the acquired video signals to a video receiving and processing module according to the received video distribution command, the video receiving and processing module processes the received video signals according to a synchronous instruction of a synchronous control module and synchronously outputs the processed video signals to each display screen, so compared with the prior art, the video input acquisition module and the video receiving and processing module of the embodiment of the invention adopt homologous clock signals, a synchronous transmission channel is adopted for connecting the input source and the output end of a video, and the synchronous display of the display screens is controlled by the synchronous instruction of the synchronous control module, thereby realizing the synchronous display of multiple screens, switching the effects of smooth and unsmooth pictures and no tearing phenomenon, meanwhile, the buffer space of the output end is reduced, the occupation of the image buffer is reduced, and the popularization and the use are facilitated.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a multi-screen video synchronous stitching device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating video sources of an embodiment of a multi-screen video synchronous stitching device according to the present invention;
FIG. 3 is a schematic diagram illustrating the effect of the video source based on FIG. 2 after two display screens are spliced according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an output image of the video receiving processing module 1 according to the embodiment of the present invention;
fig. 5 is a schematic diagram of an output image of the video receiving processing module 2 according to the embodiment of the present invention;
fig. 6 is a schematic diagram of an output image after being copied by the video receiving processing module 1 and the video receiving processing module 2 according to the embodiment of the present invention;
fig. 7 is a flowchart illustrating an embodiment of a multi-screen video synchronous stitching method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a multi-screen video synchronous stitching device according to the present invention is shown, where the device includes a video input acquisition module 10, a video distribution module 20, a synchronous control module 40, a video receiving processing module 30, and a clock generation module 60, where the video distribution module 20 is configured to generate a video distribution command according to a user operation to distribute a video to the video receiving processing module 30, and specifically, send information of a video display area, a display size, and a coordinate position to each video receiving processing module 30. In one embodiment of the present invention, the video distribution module 20 is further configured to provide a data channel from the video input acquisition module 10 to the video receiving processing module 30, the data channel provides a complete data channel from the video input acquisition module 10 to each video receiving processing module 30, and the image data transmitted to the video receiving processing module 30 is complete video source data.
The video input acquisition module 10 acquires video signals of video sources, receives commands from the video distribution module 20, obtains information of the video sources required to be displayed by each video receiving processing module 30, and sends the acquired video signals to the video receiving processing module 30 through a transmission channel.
The synchronization control module 40 is used for generating a synchronization command and synchronizing the video output of the video receiving and processing module 30 and the video output of the video input acquisition module 10. The synchronization instruction includes synchronization information corresponding to each frame of the acquired video signal, and the plurality of video receiving and processing modules 30 are controlled to synchronously output videos according to the synchronization information, so as to perform synchronous display on the display device 50.
The synchronous information is used for identifying the display time of frames in the video signals for the display end to identify and realizing the synchronous display among the multiple paths of video signals. Each frame of a video signal is respectively identified by different synchronous information. The synchronization information of a plurality of frames to be displayed synchronously in the N video signals are matched, and the matching refers to having a predetermined matching relationship, for example, may be equal. In a specific application, the synchronization information may be timestamp information, and of course, may also be other appointment information.
In the present invention, the video frames of the plurality of video receiving and processing modules 30 are synchronously output, and in the present embodiment, the synchronous output is performed at the pixel level of each line.
The video receiving and processing module 30 receives the video data sent by the video input acquisition module 10, and performs local buffering, for example, buffering a set number of frames of any path of video signal. An independent buffer unit can be arranged for each path of video signal. When the frames of the video signal are sequentially transmitted to the video receiving and processing module 30 or before being transmitted, the synchronization information included in each frame of each video signal for indicating the display time of the frame is extracted, or the synchronization information included in the synchronization signal for indicating the display time of each frame of the video signal is extracted. The video receiving and processing module 30 compares the synchronization information and searches for each frame matching the synchronization information. Thus, the frames matching the synchronization information in the N-channel video signals are simultaneously transmitted to the display device 50 for display. Therefore, synchronous display of all paths of video signals is accurately realized.
Preferably, the video receiving and processing module 30 only needs to buffer 2 frames of images, buffer the current frame in a ping-pong operation mode, read the previous frame, receive the synchronization command from the synchronization control module 40, and synchronously output the video according to the distributed display images and positions.
The clock generating module 60, the clock generating module 60 fans out a plurality of clocks with the same frequency and the same phase from the clock of the clock source to the video input acquisition module 10 and the video receiving processing module 30, and the clocks are used as the clock source of the system.
The following description will be made in detail by taking two display screens as an example. Please refer to fig. 2, which shows the video source of the present invention, and fig. 3, which shows the final display effect of the present invention on two display screens.
In this embodiment, the video distribution module 20 generates a video distribution command according to an operation performed by a user on an interface of the control software, and specifically, sends information of a display area, a display size, and a coordinate position of a video source on each display screen to the video receiving and processing module 1 corresponding to the display screen 1 and the video receiving and processing module 2 corresponding to the display screen 2.
The video input acquisition module 10 acquires video signals of video sources, receives a video distribution command from the video distribution module 20, can acquire information of the video sources required to be displayed by the video receiving and processing module 1 and the video receiving and processing module 2, and sends complete information of the video sources to the video receiving and processing module 1 and the video receiving and processing module 2 through a video transmission channel provided by the video distribution module 20. In this embodiment, the video distribution module 20 needs to send the coordinates a (Xa, Ya) and the display area and size information displayed by the video source on the display screen 1 to the video receiving and processing module 1, and send the coordinates B (Xb, Yb) and the display area and size information displayed by the video source on the screen 2 to the video receiving and processing module 2, where the contents displayed by the video receiving and processing module 1 and the video receiving and processing module 2 are as shown in fig. 4 and 5. The display screen 1 is in butt joint with the display screen 2, and synchronous splicing display of multi-screen videos is achieved.
In one embodiment of the present invention, after the video receiving processing module 1 and the video receiving processing module 2 are displayed as shown in fig. 4 and fig. 5, the video receiving processing module 1 and the video receiving processing module 2 may also copy the content displayed by each other, specifically refer to fig. 6, and after the copying is completed, complete synchronization of the video images is realized through functions such as full-screen stitching and window roaming.
As described above with respect to the multi-screen video synchronous splicing device in the embodiment of the present invention, a multi-screen video synchronous splicing method in the embodiment of the present invention is described below, with reference to fig. 7, where the multi-screen video synchronous splicing method in the embodiment of the present invention includes the following steps:
in step S10, the clock generation module generates the same source clock signal as the clock signal of each module. The clock generating module distributes a plurality of clocks with the same frequency and the same phase in the clock fan-out of the clock source to the video input acquisition module and the video receiving processing module to be used as the clock source of the system.
In step S20, the video distribution module generates a video distribution command according to the user operation. The video distribution module generates a video distribution command according to the operation of a user and distributes videos to the video receiving and processing modules, and particularly sends information of a video display area, a display size and a coordinate position to each video receiving and processing module.
And step S30, the video input acquisition module acquires video signals of a video source and sends the acquired video signals to the video receiving and processing module according to the received video distribution command. In the invention, the video input acquisition module receives the video distribution command of the video distribution module, can acquire the information of the video source required to be displayed by each video receiving and processing module, and sends the complete information of the video source to each video receiving and processing module through the video transmission channel provided by the video distribution module.
And step S40, the video receiving and processing module processes the received video signals according to the synchronous instruction of the synchronous control module and synchronously outputs the video signals to each display screen. In the invention, the video receiving and processing module only needs to buffer 2 frames of images, buffer the current frame by adopting a ping-pong operation mode, read the previous frame, receive the synchronization instruction of the synchronization module and synchronously output the video according to the distributed display images and positions.
In the present invention, step S10 may be exchanged between the first step and the second step, i.e., step S10 and step S20.
In the above embodiments, the video input acquisition module and the video receiving processing module use the same source clock, the synchronous transmission channel is used for connecting the input source and the output end of the video, and the synchronous display of the display screen is controlled by the synchronous instruction of the synchronous control module, so as to achieve the multi-screen synchronous display.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a many screen video synchronization splicing apparatus, its characterized in that, the device includes video input collection module, clock generation module, video distribution module, synchronous control module and video receiving processing module, clock generation module provides the clock signal of isogenous clock signal as video input collection module and video receiving processing module, video distribution module is used for generating video distribution command according to user's operation, video input collection module is used for gathering the video signal of video source to according to receiving video distribution command sends the video signal of gathering to video receiving processing module, video receiving processing module handles the video signal of receiving according to synchronous control module's synchronous instruction, synchronous output to each display screen.
2. A multi-screen video synchronized splicing apparatus according to claim 1, wherein the video assignment command comprises at least one of video display area, display size and coordinate position information.
3. A multi-screen video synchronous splicing device according to claim 1, wherein the synchronous control module is configured to generate a synchronization command to synchronize the video output of the video receiving and processing modules.
4. A multi-screen video synchronous stitching device as recited in claim 1, wherein the video distribution module is further configured to provide a data channel from the video input acquisition module to the video receiving processing module.
5. A multi-screen video synchronous splicing device according to claim 4, wherein the video distribution module is further configured to cut and divide the position and size of the video source displayed on each video receiving and processing module according to the video distribution command.
6. A multi-screen video synchronous splicing apparatus according to claim 1, wherein the clock generation module fans out a plurality of clocks of a clock source with the same frequency and the same phase as the same source clock signal.
7. A multi-screen video synchronous splicing method is characterized by comprising the following steps:
the clock generation module generates homologous clock signals as clock signals of each module;
the video distribution module generates a video distribution command according to user operation;
the video input acquisition module acquires video signals of a video source and sends the acquired video signals to the video receiving and processing module according to the received video distribution command;
and the video receiving and processing module processes the received video signals according to the synchronous instruction of the synchronous control module and synchronously outputs the processed video signals to each display screen.
8. A multi-screen video synchronous splicing method according to claim 7, wherein the video allocation command comprises at least one of video display area, display size and coordinate position information.
9. A multi-screen video synchronous splicing method according to claim 7, wherein the step of generating a video distribution command according to a user operation is followed by further comprising:
and providing a data channel between the video input acquisition module and the video receiving processing module.
10. A multi-screen video synchronous splicing method according to claim 7, wherein the clock generation module fans out a plurality of clocks with the same frequency and the same phase as a clock of a clock source as the same source clock signal.
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| CN113852776A (en) * | 2021-09-08 | 2021-12-28 | 维沃移动通信有限公司 | Frame insertion method and electronic equipment |
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