CN103165104A - Video signal synchronously displaying method of spliced screen - Google Patents
Video signal synchronously displaying method of spliced screen Download PDFInfo
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Abstract
The invention discloses a video signal synchronously displaying method of a spliced screen. The video signal synchronously displaying method of the spliced screen includes the following steps. Firstly, each frame data of video signal unit data which is transmitted to a corresponding displaying unit of the spliced screen is divided into multiple macro blocks and coding is carried out with a macro block as a unit. Secondly, the macro blocks which undergo coding are transmitted to a corresponding decoding device through the network. The corresponding decoding device performs decoding on the macro blocks. Thirdly, data in the decoded macro blocks is transmitted to the corresponding displaying unit of the spliced screen for being displayed. According to the video signal synchronously displaying method of the spliced screen, delay which occurs when the video signals are transmitted to the spliced screen and displayed is avoided and synchronous displaying of the corresponding video signals by all displaying units of the spliced screen is ensured.
Description
Technical field
The present invention relates to the mosaic screen field of video processing, more specifically, is a kind of vision signal synchronous display method for mosaic screen.
Background technology
Common Large Screen Display Technology realizes by mosaic display screen.Mosaic display screen is also referred to as combination, and it is stitched together a plurality of display screens (being referred to as display screen unit), is used as a superhuge screen and carries out the image demonstration.Vision signal (the video signal unit that each display screen unit is corresponding, the common whole mosaic screen video data to be shown that forms of these video signal unit data) through after the processing of the signals such as coding, decoding, export and be presented on corresponding display screen unit, complete display frame of the common composition of the vision signal that each display screen unit shows.Therefore, how realizing the simultaneous display of each display screen unit, is an important topic in the mosaic screen display technique.
Existing mosaic screen simultaneous display utilizes distributed encoding and decoding disposal system to realize more, and this system frame buffer technology Network Based utilizes synchronized timestamp to realize the simultaneous display of each vision signal on the large-screen splicing screen.
As shown in Figure 1, be the process flow diagram that existing mosaic screen simultaneous display is processed; As shown in Figure 2, be the system framework schematic diagram that corresponding simultaneous display is processed.By reference to the accompanying drawings 1,2, in step S1, the processing of encoding take frame as unit of the data (being called the video signal unit data) of utilizing scrambler 10 will input to corresponding mosaic screen display unit, every frame data are encoded into a frame data bag.In step S2, by Internet video output interface and switch 20, the frame data bag is delivered in the network frame buffer unit of decoding device corresponding to this mosaic screen display unit.In embodiment shown in Figure 2, mosaic screen 50 comprises four mosaic screen display unit 1-4, and Decoder bank 40 comprises and four demoder 1-4 that mosaic screen display units difference is corresponding.In step S3, during identical frame data bag in the network frame buffer unit is received other mosaic screen display unit decoding devices in network frame buffer unit, with the frame data bag be transported to decoding process module decode process decoding process module to the frame data bag decode process after, be transported to the mosaic screen display unit 1-4 of mosaic screen 50 interior correspondences.
As can be seen from the above analysis, in coding step, process take frame as unit for video data, therefore need to after every frame data transfer to code device, can begin encoding operation; The video data of every frame also needs to produce certain delay through coding; After coding, video data is transmitted and is stored in the network frame cache module of corresponding demoder, keep synchronous when guaranteeing that each mosaic screen display unit shows, under synchrodyne 30 effect, need guarantee at first that video data corresponding to each mosaic screen display unit decode or be transported to each mosaic screen display unit in identical in identical.Due to the uncertainty of Internet Transmission, the time that different demoders receives video data is different, and the synchronism of the video data of processing during therefore for the assurance decoding needs to store a frame or the above coded data of a frame in each network frame cache module.Usually, for guaranteeing this synchronism, in the network frame cache module, the data of storage are at least 3 to 5 frames.
Therefore correspondingly, whole system also can produce the delay of at least 3 to 5 frames.In the situation that scrambler is encoded with per second 30 frames, be about 33ms the time delay of every frame, so the delay of whole system is greatly more than 100ms.Be the displaying time of multiframe picture this time delay, and therefore such delay has affected the display effect of mosaic screen greatly.
In addition, synchrodyne 30 is used for coordinating the output of all demoders, with guarantee output signal between a plurality of demoders corresponding with each display screen unit synchronously.If synchrodyne 30 connects bad or is out of order, whole system not only serious delay can occur on showing, and the synchronism of system's output display also is difficult to guarantee.
Therefore, need a kind of new vision signal synchronous display method that is used for mosaic screen, it can either guarantee in mosaic screen that each mosaic screen unit to the simultaneous display of corresponding video data, can reduce display delay again as best one can.
Summary of the invention
One object of the present invention is to provide a kind of new vision signal synchronous display method that is used for mosaic screen, transfers at far-end the delay phenomenon that occurs when mosaic screen shows farthest to reduce vision signal.
Another object of the present invention is to provide a kind of new vision signal synchronous display method that is used for mosaic screen, can stablize when being transferred to each display screen unit of mosaic screen, keep easily synchronous to guarantee vision signal.
Vision signal synchronous display method for mosaic screen of the present invention can be realized vision signal through after Internet Transmission, the real-time undelayed simultaneous display on each mosaic screen unit of mosaic screen.Described mosaic screen comprises a plurality of mosaic screen display units, described vision signal comprises corresponding with these a plurality of mosaic screen display units respectively video signal unit, after wherein each video signal unit is processed through coding, by network delivery to the decoding device corresponding with it, after this corresponding decoding device decoding is processed, show that the method comprises the following steps to corresponding mosaic screen display unit:
A is divided into a plurality of macro blocks with the every frame data in the described video signal unit data that flow to corresponding mosaic screen display unit, and the processing of encoding take this macro block as unit;
B arrive the decoding device of correspondence with completing the macro block that coding processes by network delivery, this corresponding decoding device is to the processing of decoding of this macro block;
C is transported to corresponding mosaic screen display unit with these data in the macro block that decoding is processed and shows.
Preferably, this corresponding decoding device comprises network macro block chained list and codec processing unit, and in step b, this corresponding decoding device comprises the following steps the processing of decoding of this macro block:
This corresponding decoding device is delivered to network macro block chained list with this macro block;
The decoding request that this network macro block chained list decoding device corresponding according to this sends is delivered to processings of decoding of this codec processing unit with this macro block, and wherein said decoding asks to send with the frequency of fixing.
Preferably, described network macro block chained list comprises the input of network macro block chained list pointer, network macro block chained list main body and network macro block chained list output pointer.
Preferably, in this step a, described every frame data are the video data matrix of the capable N row of M, this video data matrix with every P behavior unit, is divided into the macro block of L the capable N row of P with it, wherein, M, N are positive integer, and P is the integer less than M, and L is [M/P] or [M/P]+1.Described P is preferably 16.
Vision signal synchronous display method for mosaic screen of the present invention, can avoid the delay phenomenon of vision signal in the process that is transferred to mosaic screen and shows, and guaranteed to form the simultaneous display of each mosaic screen display unit pair vision signal corresponding with it of mosaic screen, thereby improved the display effect of whole picture.
Description of drawings
Fig. 1 is the process flow diagram that existing mosaic screen simultaneous display is processed;
Fig. 2 is the system framework schematic diagram that the simultaneous display corresponding with Fig. 1 processed;
Fig. 3 is the process flow diagram of the vision signal synchronous display method for mosaic screen of the present invention;
Fig. 4 is the schematic flow sheet more specifically of step S200 in Fig. 3;
Fig. 5 is the system framework schematic diagram of realizing an embodiment of the vision signal synchronous display method for mosaic screen of the present invention in Fig. 3;
Fig. 6 is the more detailed composition schematic diagram in one of them demoder in Fig. 5;
Fig. 7 is the macroblock partitions schematic diagram of step S100 of the present invention in Fig. 3.
Embodiment
Below with reference to the accompanying drawings and embodiment, the performing step of the vision signal synchronous display method for mosaic screen of the present invention is elaborated.
In general, the vision signal synchronous display method for mosaic screen of the present invention can be realized vision signal through after Internet Transmission, the real-time undelayed simultaneous display on each mosaic screen unit of mosaic screen.particularly, with reference to Fig. 5, mosaic screen 300 comprises a plurality of mosaic screen display units (mosaic screen display unit 1-4 as shown in Figure 5), vision signal comprises corresponding with these a plurality of mosaic screen display units respectively video signal unit, after wherein each video signal unit is processed through the coding of scrambler 100, by network delivery to the decoding device (as demoder 1-4 in Fig. 5 decoded portion 200) corresponding with it, after this corresponding decoding device decoding is processed, show to corresponding mosaic screen display unit (mosaic screen display unit 1-4 as shown in Figure 5).With reference to Fig. 3, vision signal synchronous display method for mosaic screen of the present invention, comprise step S100-step S300: in step S100, every frame data in the described video signal unit data that flow to corresponding mosaic screen display unit are divided into a plurality of macro blocks, and the processing of encoding take this macro block as unit; In step S200, arrive the decoding device of correspondence by network delivery with completing the macro block that coding processes, this corresponding decoding device is to the processing of decoding of this macro block; In step S300, these data in the macro block that decoding is processed are transported to corresponding mosaic screen display unit show.Below in conjunction with accompanying drawing, the vision signal synchronous display method for mosaic screen of the present invention is described in more detail.
Step S100.In this step, the every frame data in the described video signal unit data that flow to corresponding mosaic screen display unit are divided into a plurality of macro blocks, and the processing of encoding take this macro block as unit.
As mentioned above, and with reference to Fig. 5, in the display mechanism of mosaic screen, video signal data is divided into a plurality of video signal unit data, finally is shown to corresponding mosaic screen unit, and each mosaic screen display unit forms a complete picture.Each video signal unit data after needing to process through coding, is processed through decoding through Internet Transmission to local decoding end, finally is shown on its corresponding mosaic screen unit.At step S100 of the present invention, be in coding step, from existing different take frame as unit encoding, at first this step is divided into a plurality of macro blocks with the every frame data in the video signal unit data, the processing of then encoding take this macro block as unit.
Above-mentioned macro block is a plurality of data blocks that every frame data are divided into.In the data of the shown every frame picture of final display screen unit, be actually the data matrix of multiple lines and multiple rows, for convenience of describing, it is expressed as the matrix of the capable N row of M.Preferably, with fixing line number, this data matrix is divided equally, namely take fixing integer capable (being expressed as P capable) as unit, cut apart every frame data.Thereby every frame data are divided into the macro block (being expressed as L) of the capable N row of a plurality of P, wherein, M, N are positive integer, and P is the integer less than M, and L is [M/P] (" [] " is the marker character of round numbers) or [M/P]+1.Preferably, with reference to figure 7, every 16 row form a macro block usually, namely get P=16.Certain P is desirable other suitable line numbers, for example macro block of the capable composition of every 8-32 also.
For example, be the incoming video signal of 1920*1080*60Hz (i.e. 1080 row 1920 row) for resolution, when every 16 row form a macro block, every frame data can be divided into [1080/16=67.5] individual macro block, i.e. 67 macro blocks, perhaps [1080/16=67.5]+1 macro block, i.e. 68 macro blocks.
In conjunction with Fig. 5, receive a macro block of video signal data unit one frame data when scrambler 100 after, namely begin the processing of encoding of this macro block, it is identical with existing coding processing mode that coding is processed the mode that adopts, for example adopt H.264 compression protocol, this macro block is encoded.Certainly also can adopt other any suitable data-encoding schemes.
Step S200.In this step, arrive the decoding device of correspondence by network delivery with completing the macro block that coding processes, this corresponding decoding device is to the processing of decoding of this macro block.Particularly, with reference to Fig. 5, after a macro block in the video signal data unit is encoded, the processing of namely decoding in the demoder corresponding with this video signal data unit by network delivery.The mode that decoding is processed adopts conventional decoding processing mode, and corresponding with the mode processed that it is encoded, and for example, when coding processing mode adopted that H.264 compression protocol is encoded, corresponding decoding was processed and adopted H.264 decompression protocol to carry out.Each decoding device (demoder 1-4 as shown in Figure 5) is decoded to the macro block of the video signal data unit of correspondence with identical decoding rate, to guarantee each macro block after decoding, synchronously be transported to corresponding mosaic screen display unit (as the mosaic screen display unit 1-4 in Fig. 5).
But, in network transmission process, because transmission speed is not invariable, network transfer speeds namely appears sometimes not in critical field, produce and have too fast or excessively slow phenomenon.the problem that may occur for solving this, prevent to provide in time the macro block processing of raising the price when network transfer speeds is slower than normal speed, perhaps can not provide data buffering in speed during faster than normal speed, in a preferred mode of the present invention, this this corresponding decoding device comprises network macro block chained list and codec processing unit, correspondingly, in conjunction with Fig. 4, in step 200, preferably, this corresponding decoding device is to the processing of decoding of this macro block, comprise the following steps: step S210, this corresponding decoding device is delivered to network macro block chained list with this macro block, step S220, the decoding request that this network macro block chained list decoding device corresponding according to this sends is delivered to processings of decoding of this codec processing unit with this macro block, and wherein said decoding asks to send with the frequency of fixing.More specifically, as shown in Figure 6, be the composition schematic diagram of a corresponding decoding device of mosaic screen display unit, it comprises network macro block chained list 220 and codec processing unit 230.Network macro block chained list 220 comprises the input of network macro block chained list pointer 221, network macro block chained list main body 222 and network macro block chained list output pointer 223.After in a macro block is transported to corresponding decoding processing device, not to deliver to codec processing unit 230 processing of decoding at once, but utilize network macro block chained list input pointer 221, this macro block is sent in network macro block chained list 220, be used for the data in macro block are carried out buffer-stored, then, according to the decoding request that decoding device sends, utilize network macro block output pointer 223 that a macro block data is transported to codec processing unit 220 processing of decoding.
Therefore, the existence of network macro block chained list 220, the available buffer macro block data wraps in the instability in network transmission process.That is to say, when the speed of transmitted data on network during faster than normal speed, according to normal changeless decode rate, can not in time process (being that decoding device not yet sends the decoding request) to macro block, can be temporarily stored in macro block data in network macro block chained list 220 this moment, device to be decoded sends when request decoding, then macro block data is transferred to codec processing unit 230 decodes; On the other hand, when the speed of transmitted data on network is slower than normal speed, network macro block chained list 220 can with in it the data of buffer memory flow to codec processing unit 230 and decode.Thereby guaranteed the data decode that decoder module neither can occur not receiving, the too much situation of receive data also can not occur.
Step S300.In this step, the data in the macro block that decoding is processed are transported to corresponding mosaic screen display unit show.Macro block data namely is transported to corresponding mosaic screen display unit and shows after decoding.Thereby the complete picture of the common formation of the displaying contents of each mosaic screen.
By above-mentioned steps S100-S300, can compare existing mosaic screen simultaneous display technology, greatly shortened time delay.Particularly, the input of vision signal and collection are real-time, without any delay; With video data transmitting to code device, and the time delay of encoding and being brought as unit take macro block, it doesn't matter with frame per second, and only with relevant to the resolution of the coding rate of each macro block and frame picture data, for example, for 1920*1080 (i.e. 1920 row, 1080 row) picture, the scramble time of whole picture only needs the 0.98ms left and right, and for the picture of 1280*720, the scramble time of whole picture only needs 1.4ms; Network output after coding, the time that postpones is less than 1ms; In decoding end, the needed buffer delay of macro block macro block chained list is less than 1ms; And whole data transmission period from the coding side to the decoding end depends on the performance of the network switch, is not more than 10ms (for example, for the switch of gigabit, the transmission time, the switch for 100,000,000, the transmission time was in 10ms in 3ms).Therefore, a frame picture is in the whole total time delay that is presented on corresponding mosaic screen display unit that is input to from data, less than 15ms.For the image demonstration of 60 frame/seconds, the displaying time of every frame is about 16.7ms.Therefore whole delay is less than the displaying time of 1 two field picture.Therefore be not have influentially this time delay for people's visual effect, is sensuously real-time fully, thereby basically guaranteed showing without postponing of vision signal.
In addition, adopted network macro block chained list due to the present invention in decoding device, and the speed of decoding device transmission decoding request is changeless.Therefore, the corresponding decoding device of each mosaic screen display unit is also synchronous to the decoding of macro block in each video signal data unit, thereby has guaranteed the synchronism of display frame on the mosaic screen display unit.And the present invention need not take synchronization mechanism as shown in Figure 2, can guarantee the synchronism of decoding.
In above-mentioned embodiment shown in Figure 5, mosaic screen comprises four mosaic screen display units, but easily understands, and mosaic screen also can comprise the mosaic screen display unit of other quantity, and each shows that with screen display units match has corresponding decoding device.
In sum, vision signal synchronous display method for mosaic screen of the present invention, can avoid the delay phenomenon of vision signal in the process that is transferred to mosaic screen and shows, and guaranteed to form the simultaneous display of each mosaic screen display unit pair vision signal corresponding with it of mosaic screen, thereby improved the display effect of whole picture.
Claims (5)
1. vision signal synchronous display method that is used for mosaic screen, described mosaic screen comprises a plurality of mosaic screen display units, described vision signal comprises corresponding with these a plurality of mosaic screen display units respectively video signal unit, after wherein each video signal unit is processed through coding,,, after processing, this corresponding decoding device decoding shows to corresponding mosaic screen display unit to the decoding device corresponding with it by network delivery, it is characterized in that, the method comprises the following steps:
A is divided into a plurality of macro blocks with the every frame data in the described video signal unit data that flow to corresponding mosaic screen display unit, and the processing of encoding take this macro block as unit;
B arrive the decoding device of correspondence with completing the macro block that coding processes by network delivery, this corresponding decoding device is to the processing of decoding of this macro block;
C is transported to corresponding mosaic screen display unit with these data in the macro block that decoding is processed and shows.
2. the vision signal synchronous display method for mosaic screen according to claim 1, it is characterized in that, this corresponding decoding device comprises network macro block chained list and codec processing unit, in step b, this corresponding decoding device comprises the following steps the processing of decoding of this macro block:
This corresponding decoding device is delivered to network macro block chained list with this macro block;
The decoding request that this network macro block chained list decoding device corresponding according to this sends is delivered to processings of decoding of this codec processing unit with this macro block, and wherein said decoding asks to send with the frequency of fixing.
3. the vision signal synchronous display method for mosaic screen according to claim 2, is characterized in that, described network macro block chained list comprises the input of network macro block chained list pointer, network macro block chained list main body and network macro block chained list output pointer.
4. the described vision signal synchronous display method for mosaic screen of any one according to claim 1-3, it is characterized in that, in this step a, described every frame data are the video data matrix of the capable N row of M, and this video data matrix with every P behavior unit, is divided into it macro block that L capable N of P is listed as, wherein, M, N are positive integer, and P is the integer less than M, and L is [M/P] or [M/P]+1.
5. the vision signal synchronous display method for mosaic screen according to claim 4, is characterized in that, described P is 16.
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| CN111208965B (en) * | 2020-01-15 | 2023-09-22 | 宁波Gqy视讯股份有限公司 | Spliced display system and display method thereof |
| CN111263230A (en) * | 2020-02-19 | 2020-06-09 | 北京仁光科技有限公司 | Distributed splicing display picture synchronization method and system |
| CN111263230B (en) * | 2020-02-19 | 2022-04-26 | 北京仁光科技有限公司 | Distributed splicing display picture synchronization method and system |
| CN111417005A (en) * | 2020-04-27 | 2020-07-14 | 北京淳中科技股份有限公司 | Video signal synchronous encoding method, device, system and encoding end |
| WO2021248889A1 (en) * | 2020-06-10 | 2021-12-16 | 威创集团股份有限公司 | Display wall signal synchronization method and device |
| CN113781302A (en) * | 2021-08-25 | 2021-12-10 | 北京三快在线科技有限公司 | Multi-path image splicing method and system, readable storage medium and unmanned vehicle |
| CN113781302B (en) * | 2021-08-25 | 2022-05-17 | 北京三快在线科技有限公司 | Multi-path image splicing method and system, readable storage medium and unmanned vehicle |
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