CN111935521B - LED display synchronous control array and LED display system - Google Patents
LED display synchronous control array and LED display system Download PDFInfo
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- CN111935521B CN111935521B CN202010808779.5A CN202010808779A CN111935521B CN 111935521 B CN111935521 B CN 111935521B CN 202010808779 A CN202010808779 A CN 202010808779A CN 111935521 B CN111935521 B CN 111935521B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41415—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance involving a public display, viewable by several users in a public space outside their home, e.g. movie theatre, information kiosk
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
The invention relates to an LED display synchronous control array and an LED display system, wherein the LED display synchronous control array comprises a synchronous master control unit and a plurality of video processing units; the synchronous master control unit comprises: the synchronous source sampling module is used for acquiring a synchronous signal from the outside; the synchronous control module is used for configuring a main synchronous signal and a standby synchronous signal used by the video processing unit, controlling the synchronous signal output module and outputting a corresponding main synchronous signal to the video processing unit; the synchronous state monitoring module is used for monitoring the state of a synchronous signal used by the video processing unit; when a video processing unit is judged to lose the synchronous signal, the corresponding standby synchronous signal is output to the video processing unit. The scheme has simple structure, can quickly switch to the standby synchronous signal, and effectively ensures the stability of the system.
Description
Technical Field
The invention relates to the field of LED display screens, in particular to an LED display synchronous control array and an LED display system.
Background
With the continuous development of the LED display technology, especially the continuous innovation of the small-spacing technology, the resolution ratio of the LED display screen is larger and larger, and the size of the spliced display screen is also larger and larger. When displaying, a plurality of different video sources generally need to be sent to different video controllers for processing; the video controllers respectively control the display work of one area on the display screen, and the plurality of video controllers synchronously work together to realize the synchronous display of the picture of the whole spliced large screen.
In addition, under the scenes of a monitoring center, a studio, a large conference room, a performance site and the like, a main LED display screen with super-large resolution may be arranged to be matched with a plurality of auxiliary LED display screens. Between main LED display screen and vice LED display screen, need to adopt a plurality of video sources and video controller, also need synchro control moreover, let the two can the synchronous display.
In the prior art, in order to implement synchronous control between a display screen with an ultra-large resolution or a plurality of main and auxiliary screens, a video source is generally output to a splicer or a video processor for processing, and then a video controller performs synchronous output. However, the maximum processing power of the existing video controllers is limited, typically to a resolution of 4K. When the display with ultra-large resolution is processed, a plurality of video controllers are used for cooperation, and synchronous control of videos can be achieved. Due to the cooperation of a plurality of video controllers, on one hand, the cost is increased, and on the other hand, the complexity of the system is increased, so that the stability of the system has certain risks.
Disclosure of Invention
Based on this, it is necessary to provide an LED display synchronization control array and an LED display system in order to solve the problems of complex system architecture and insufficient system stability due to the cooperation of a plurality of video controllers in the conventional synchronization control scheme of the ultra-large resolution LED display screen.
An embodiment of the application provides an LED display synchronous control array, which comprises a synchronous master control unit and a plurality of video processing units; the synchronous master control unit is connected with all the video processing units and provides a synchronous signal for each video processing unit;
the synchronous master control unit comprises a synchronous source sampling module, a synchronous signal output module, a synchronous state monitoring module, a synchronous control module, a first synchronous signal generator and a second synchronous signal generator;
the synchronous source sampling module is used for acquiring at least one synchronous signal from the outside;
the synchronous control module configures a main synchronous signal and a standby synchronous signal used by the video processing unit from synchronous signals received by the synchronous master control unit according to a preset configuration strategy, controls the synchronous signal output module and outputs a corresponding main synchronous signal to the video processing unit;
the synchronous state monitoring module is used for monitoring the state of the synchronous signal used by the video processing unit and judging whether the synchronous signal is lost;
when the synchronous state monitoring module judges that a certain video processing unit loses a synchronous signal, the synchronous control module controls the synchronous signal output module to output a corresponding standby synchronous signal to the video processing unit;
the first synchronous signal generator is used for generating a corresponding synchronous signal according to the configuration of the synchronous control module;
the second-stage synchronous signal generator is used for generating a corresponding synchronous signal according to the control of the synchronous control module; the synchronous processing module of the video processing unit carries out synchronous output processing on the video according to the synchronous signal generated by the second-stage synchronous signal generator;
the video processing unit comprises a video acquisition module, a synchronous processing module and an output module;
the video acquisition module is used for acquiring an input video and outputting the input video to the synchronous processing module;
the synchronous processing module is used for synchronously outputting and processing the received video according to the received synchronous signal;
and the output module outputs the video subjected to synchronous output processing to the corresponding LED display screen for displaying.
In some embodiments, the synchronous overall control unit further comprises a network communication module for receiving an externally input control command; the synchronous control module controls the first synchronous signal generator to generate a corresponding synchronous signal according to the received control command; and/or configuring a synchronization signal output to the video processing unit.
In some embodiments, the synchronization signal generated by the second-stage synchronization signal generator is also output to the synchronous overall control unit; and the synchronous master control unit configures a main synchronous signal and a standby synchronous signal required by the video processing unit according to the synchronous signal acquired by the synchronous source sampling module, the synchronous signal generated by the first synchronous signal generator and the synchronous signal generated by the second synchronous signal generator.
In some embodiments, when the video acquisition module acquires an input video, the video acquisition module also acquires a synchronization signal in the input video and outputs the synchronization signal to the synchronous overall control unit and/or the synchronous processing module.
In some embodiments, the output module is provided with a plurality of output ports; the video processing unit also comprises a video intercepting module which is used for intercepting the video after synchronous output processing according to the loaded area of the output port; and the output module selects the corresponding output port to output the intercepted video.
In some embodiments, the video processing unit further includes a synchronization signal monitoring module for monitoring the state of the synchronization signal inside the video processing unit and all the synchronization signals output by the synchronization signal output module, and when it is monitored that the synchronization signal inside the video processing unit is lost, the video processing unit switches to receive the standby synchronization signal.
Another embodiment of the present application further provides an LED display system, including an LED display screen and a controller, the controller receives an externally input video, transmits the video to the LED display screen for display, and the controller is the LED display synchronization control array according to any one of the preceding embodiments.
In some embodiments, a player is also included for parsing the video source and outputting video data to the controller.
According to the LED display synchronous control array provided by the embodiment of the application, the synchronous master control unit uniformly controls the distribution of synchronous signals, the plurality of video processing units acquire and synchronously output videos, and the structure is simple; and the synchronous master control unit is provided with a main synchronous signal and a standby synchronous signal for each video processing unit, when the loss of the synchronous signal used by the video processing unit is monitored, the synchronous master control unit can be quickly switched to the standby synchronous signal, and the stability of the system is effectively guaranteed.
Drawings
Fig. 1 is a schematic diagram of a frame structure of an LED display system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a frame structure of an LED display synchronization control array according to an embodiment of the present application;
fig. 3 is a schematic diagram of a frame structure of an LED display synchronization control array according to another embodiment of the present application.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, an embodiment of the present application discloses an LED display synchronization control array, which includes a synchronization overall control unit 100 and a plurality of video processing units 200; the synchronous master control unit 100 is connected with all the video processing units 200 and provides a synchronous signal for each video processing unit 200;
the synchronous master control unit 100 comprises a synchronous source sampling module 110, a synchronous signal output module 120, a synchronous state monitoring module 130 and a synchronous control module 140;
the synchronous source sampling module 110 is configured to obtain at least one synchronous signal from the outside;
the synchronization control module 140 configures a main synchronization signal and a standby synchronization signal used by the video processing unit 200 from the synchronization signals received from the synchronization master control unit 100 according to a preset configuration policy, and controls the synchronization signal output module 120 to output a corresponding main synchronization signal to the video processing unit 200;
a synchronization status monitoring module 130, configured to monitor a status of a synchronization signal used by the video processing unit 200, and determine whether a synchronization signal is lost;
when the synchronization state monitoring module 130 determines that a video processing unit 200 loses the synchronization signal, the synchronization control module 140 controls the synchronization signal output module 120 to output a corresponding standby synchronization signal to the video processing unit 200;
the video processing unit 200 comprises a video acquisition module 210, a synchronous processing module 220 and an output module 230;
the video acquisition module 210 is configured to acquire an input video and output the video to the synchronization processing module 220;
a synchronization processing module 220, which performs synchronization output processing on the received video according to the received synchronization signal;
and the output module 230 outputs the video subjected to the synchronous output processing to the corresponding LED display screen for displaying.
The synchronous overall control unit 100 is used for providing synchronous signals required by the video processing unit 200, and the video processing unit 200 is the actual responsible main body for video acquisition and output synchronous processing.
In the synchronous overall control unit 100, the synchronous source sampling module 110 may acquire a plurality of synchronous signals from the outside. The synchronization control module 140 configures the required synchronization signals for each video processing unit 200, including a primary synchronization signal and a standby synchronization signal. The synchronization control module 140 controls the synchronization signal output module 120 to output the corresponding main synchronization signal to the video processing unit 200 by default. The synchronization processing module 220 of the video processing unit 200 performs synchronization output processing on the received video according to the received master synchronization signal, and then outputs the processed video to the corresponding LED display screen for display through the output module 230. When it is detected that the synchronization signal of the video processing unit 200 is lost, the synchronization control module 140 may control the synchronization signal output module 120 to switch and output the standby synchronization signal to the video processing unit 200, so as to ensure that the synchronization output of the video is not affected.
According to the LED display synchronous control array provided by the embodiment of the application, the synchronous master control unit uniformly controls the distribution of synchronous signals, the plurality of video processing units acquire and synchronously output videos, and the structure is simple; and the synchronous master control unit is provided with a main synchronous signal and a standby synchronous signal for each video processing unit, when the loss of the synchronous signal used by the video processing unit is monitored, the synchronous master control unit can be quickly switched to the standby synchronous signal, and the stability of the system is effectively guaranteed.
In some embodiments, the synchronous overall control unit 100 further comprises a first synchronous signal generator 150 for generating a corresponding synchronous signal according to the configuration of the synchronous control module 140. By providing the first sync signal generator 150, a sync signal can be autonomously generated, and a sync signal required for the operation of the video processing unit 200 can be output without an externally input sync signal. Meanwhile, the first sync signal generator 150 may also be used for generation of the spare sync signal.
In some embodiments, the synchronous overall control unit 100 further includes a network communication module 160 for receiving an externally input control command; the synchronization control module 140 controls the first synchronization signal generator 150 to generate a corresponding synchronization signal according to the received control command; and/or configure the synchronization signals output to the video processing unit 200.
In some examples, the video processing unit 200 may further include a second-stage sync signal generator 250 for generating a corresponding sync signal according to the control of the sync control module 140; the synchronization processing module 220 of the video processing unit 200 can perform synchronization output processing on the video according to the synchronization signal generated by the second-stage synchronization signal generator 250. Unlike the synchronization signal generated by the first synchronization signal generator 150 that can be used for the global video processing unit 200, the second-stage synchronization signal generator 250 inside the video processing unit 200 is mainly used for the local video processing unit 200. Especially, when the communication between the synchronous general control unit 100 and the video processing unit 200 is interrupted, the video processing unit 200 may utilize the internal second-stage synchronous signal generator 250 to generate a synchronous signal, so as to implement synchronous output control of the video processed by itself, and improve the reliability of the whole system.
Further, the synchronization signal generated by the second-stage synchronization signal generator 250 can also be output to the synchronous overall control unit 100. The synchronization control module 140, in configuring the main synchronization signal and the standby synchronization signal required by the video processing unit 200, may be based on the synchronization signal collected by the synchronization source sampling module 110, the synchronization signal generated by the first synchronization signal generator 150, and the synchronization signal generated by the second synchronization signal generator 250. In this way, a two-level routing structure of the synchronization signal can be realized, and the synchronization signal can be provided by the synchronous overall control unit 100, or the synchronization signal can be provided by the video processing unit 200 and used by other video processing units 200.
In some embodiments, the video capture module 210 of the video processing unit 200 may capture a synchronization signal in the input video when capturing the input video, and output the synchronization signal to the synchronization overall control unit 100 and/or the synchronization processing module 220. Thus, the video processing unit 200 can directly extract the synchronization signal from the input video and can be used internally, or can be provided to the synchronous overall control unit 100 and used in the global video processing unit 200.
In some embodiments, the output module 230 may be provided with a plurality of output ports, and the video processing unit 200 may further include a video capture module 240, configured to capture the video after the synchronous output processing according to the loaded area of the output ports; the output module 230 selects the corresponding output port to output the intercepted video. The loaded area of each output port can correspond to a local area of the LED display screen. And determining the loaded area of each output port according to the loaded capacity of the output port and the connection relation between the output port and the LED display screen.
The output module 230 and the LED display screen may be connected by any circuit. In order to ensure the loading capacity of the line, in some embodiments, the output module 230 is connected to the LED display screen through a network cable, and the output module 230 is further configured to convert the intercepted video into a network communication data format, and transmit the network communication data format to the corresponding LED display screen through the network cable for displaying.
In some embodiments, the output module 230 is connected to the LED display screen via optical fibers; the output module 230 is further configured to convert the captured video into an optical signal, and transmit the optical signal to a corresponding LED display screen through an optical fiber for display. As an example, the output module 230 may specifically adopt a gigabit optical port output module.
In some embodiments, the video processing unit 200 may further include a synchronization signal monitoring module 260 for monitoring the state of the synchronization signal inside the video processing unit 200 and all the synchronization signals output by the synchronization signal output module 120, and switching to receive the standby synchronization signal when the loss of the synchronization signal inside the video processing unit 200 is monitored.
According to the LED display synchronous control array provided by the embodiment of the application, one synchronous master control unit uniformly controls the distribution of synchronous signals, and a plurality of video processing units are used for acquiring and synchronously outputting videos, so that the structure is simple; and the synchronous master control unit is provided with a main synchronous signal and a standby synchronous signal for each video processing unit, when the loss of the synchronous signal used by the video processing unit is monitored, the synchronous master control unit can be quickly switched to the standby synchronous signal, and the stability of the system is effectively guaranteed.
Another embodiment of the present application further provides an LED display system, which includes an LED display screen 10 and a controller 20, wherein the controller 20 receives an externally input video, and transmits the externally input video to the LED display screen 10 for displaying, and the controller 20 is the LED display synchronization control array according to any one of the foregoing embodiments.
Since the LED display synchronization control array in the foregoing embodiment is adopted, the LED display system obviously has the beneficial effect of the LED display synchronization control array.
The LED display screen 10 may be formed by splicing a plurality of LED display units 900. The video processing unit 200 in the LED display synchronization control array can correspondingly control the display area formed by one or more LED display units 900.
It is understood that the LED display screen 10 may also include a main display screen and a plurality of sub-display screens, and one video processing unit 200 may correspond to a partial display area in the main display screen, a partial display area in the sub-display screens, or a display area of the entire sub-display screens. The specific correspondence is determined according to the processing capability of each video processing unit 200.
In some embodiments, the LED display system may further include a player 30 for parsing the video source and outputting video data to the controller 20.
The player 30 may be any device having a video playing function, such as a smart terminal, a computer, or the like.
The system/computer device integrated components/modules/units, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
In the several embodiments provided in the present invention, it should be understood that the disclosed system and method may be implemented in other ways. For example, the system embodiments described above are merely illustrative, and for example, the division of the components is only one logical division, and other divisions may be realized in practice.
In addition, each functional module/component in each embodiment of the present invention may be integrated into the same processing module/component, or each module/component may exist alone physically, or two or more modules/components may be integrated into the same module/component. The integrated modules/components can be implemented in the form of hardware, or can be implemented in the form of hardware plus software functional modules/components.
It will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention are capable of being embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it will be obvious that the term "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, apparatus or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. An LED display synchronous control array is characterized by comprising a synchronous master control unit and a plurality of video processing units; the synchronous master control unit is connected with all the video processing units and provides a synchronous signal for each video processing unit;
the synchronous master control unit comprises a synchronous source sampling module, a synchronous signal output module, a synchronous state monitoring module, a synchronous control module, a first synchronous signal generator and a second synchronous signal generator;
the synchronous source sampling module is used for acquiring at least one synchronous signal from the outside;
the synchronous control module configures a main synchronous signal and a standby synchronous signal used by the video processing unit from synchronous signals received by the synchronous master control unit according to a preset configuration strategy, controls the synchronous signal output module and outputs a corresponding main synchronous signal to the video processing unit;
the synchronous state monitoring module is used for monitoring the state of the synchronous signal used by the video processing unit and judging whether the synchronous signal is lost;
when the synchronous state monitoring module judges that a certain video processing unit loses a synchronous signal, the synchronous control module controls the synchronous signal output module to output a corresponding standby synchronous signal to the video processing unit;
the first synchronous signal generator is used for generating a corresponding synchronous signal according to the configuration of the synchronous control module;
the second-stage synchronous signal generator is used for generating a corresponding synchronous signal according to the control of the synchronous control module; the synchronous processing module of the video processing unit carries out synchronous output processing on the video according to the synchronous signal generated by the second-stage synchronous signal generator;
the video processing unit comprises a video acquisition module, a synchronous processing module and an output module;
the video acquisition module is used for acquiring an input video and outputting the input video to the synchronous processing module;
the synchronous processing module is used for synchronously outputting and processing the received video according to the received synchronous signal;
and the output module outputs the video subjected to synchronous output processing to the corresponding LED display screen for displaying.
2. The LED display synchronous control array according to claim 1, wherein the synchronous master control unit further comprises a network communication module for receiving an externally input control command; the synchronous control module controls the first synchronous signal generator to generate a corresponding synchronous signal according to the received control command; and/or configuring a synchronization signal output to the video processing unit.
3. The LED display synchronization control array according to claim 2, wherein the synchronization signal generated by the second-stage synchronization signal generator is further outputted to the synchronization overall control unit; and the synchronous master control unit configures a main synchronous signal and a standby synchronous signal required by the video processing unit according to the synchronous signal acquired by the synchronous source sampling module, the synchronous signal generated by the first synchronous signal generator and the synchronous signal generated by the second synchronous signal generator.
4. The LED display synchronous control array according to claim 3, wherein the video acquisition module, when acquiring an input video, also acquires a synchronous signal in the input video and outputs the synchronous signal to the synchronous master control unit and/or the synchronous processing module.
5. The LED display synchronization control array according to any one of claims 1-4, wherein the output module is provided with a plurality of output ports; the video processing unit also comprises a video intercepting module which is used for intercepting the video after synchronous output processing according to the loaded area of the output port; and the output module selects the corresponding output port to output the intercepted video.
6. The LED display synchronization control array according to any one of claims 1-4, wherein the video processing unit further comprises a synchronization signal monitoring module for monitoring the status of the synchronization signal inside the video processing unit and all the synchronization signals outputted from the synchronization signal output module, and when the loss of the synchronization signal inside the video processing unit is monitored, the standby synchronization signal is switched to be received.
7. An LED display system, comprising an LED display screen and a controller, wherein the controller receives externally input video and transmits the video to the LED display screen for display, and the controller is the LED display synchronous control array as claimed in any one of claims 1 to 6.
8. The LED display system of claim 7, further comprising a player for parsing the video source and outputting video data to the controller.
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| 用于大型LED显示屏的超高清视频质量评价要点;李农，朱斌;《智能建筑电气技术》;20171220;53-55 * |
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