CN103118272A - Multi-scenario digital television implementation method - Google Patents
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Abstract
The invention provides a multi-scenario digital television implementation method. As for a digital television program for simultaneously providing a plurality of scenario videos, each scenario video encodes a standard-definition basic layer and a high-definition enhancement layer by the aid of spatial scalable video coding technology. When a certain scenario is played in a full-screen manner, the standard-definition basic layer and the high-definition enhancement layer of the scenario are completely decoded to form a high-definition video. When a certain scenario is played with a low resolution ratio in a picture-in-picture or 'mosaic' mode, only the standard-definition basic layer of the scenario is decoded. Compared with the prior art, the multi-scenario digital television implementation method has the advantages that standard-definition videos and high-definition videos of the scenarios can be simultaneously provided, digital television terminals such as a set-top box do not need to perform high-definition decoding for all the scenarios in multi-scenario display, the problem of insufficiency of processing capacity of the digital television terminals such as the set-top box is solved, and the audience can simultaneously enjoy multi-scenario high-definition videos.
Description
Technical field
The present invention relates to digital television techniques field, specifically a kind of implementation method of many scenes Digital Television.
Background technology
it is the important content of TV that sports tournaments etc. are relayed live, more than ten to tens of general field deployments video camera seat in the plane is (as in Fig. 1 101, 102 to 103), each video camera is taken a plurality of targets from a plurality of angles respectively, form the video-audio signal of different scenes (in Fig. 1 104, 105 to 106), video-audio signal converges to cut bank (in Fig. 1 107), controlled by instructor in broadcasting (in Fig. 1 108) and therefrom carry out real-time selection and switch, realize the output of one road video (in Fig. 1 109), broadcast and broadcasting transmitting through television system (in Fig. 1 110), make mass viewer audiences (in Fig. 1 115, 116 and 117) television set by separately is (in Fig. 1 112, 113 and 114) receive appreciation.Different spectators' focus there are differences, and wishes to watch the scene of paying close attention to separately, but selects to switch the video-audio signal of formation from the instructor in broadcasting owing to only coming, and can't satisfy spectators' personalization and appreciate needs.Therefore wish that TV can provide multi-channel video from on-the-spot different cameras to spectators, to reflect different field scene, make spectators therefrom select the scene appreciated according to the interest of oneself.And carry out autonomous switching between a plurality of scene videos that spectators can therefrom be provided, and the video of a plurality of scenes is shown on video screen simultaneously.
Under the simulated television technology, one road Audio and Video just need to take a television channel and (generally identify with its centre frequency, below be simply referred to as frequency in Digital Television), because frequency resource is limited, being difficult to provides a plurality of channels with the different scenes of transmission multichannel for relaying live simultaneously.And can receive simultaneously 2 channels except the television set that has on a small quantity " picture-in-picture " function, most television sets can only receive a channel, are difficult to be simultaneously displayed on the many scene videos on a plurality of channels.
After television digitization, television audio and video signals adopts the audio frequency and video digital coding to make its bandwidth occupancy obtain very big compression, and for example the SD program adopts H.264 to encode only needs 1.5Mbps, and high-definition program is about 8～12Mbps.Also research has realized that the Digital Modulation technology such as QAM, QPSK and COFDM have realized the digitlization of television transmission, for example utilize 64QAM can realize that the frequency of 8MHz frequency range under Phase Alternation Line system has the above digital signal actual transmissions of 38Mbps ability in cable TV simultaneously.This makes Digital Television transmittability than simulated television under the identical traffic frequency resource improve several times, and can carry high-definition program.
Simultaneously the digital TV terminal such as set-top box decoding capability more and more stronger, the multichannel SD vision signal of can decoding simultaneously or two-way high-definition video signal.This appreciates for the needed many scenes of spectators need to provide transmission and terminal plays basis, so the present invention has realized a kind of implementation method that many scenes of high definition TV of multichannel scene can be provided simultaneously.
Summary of the invention
Technical assignment of the present invention is to solve the deficiencies in the prior art, and a kind of implementation method of many scenes Digital Television is provided.
Technical scheme of the present invention realizes in the following manner, the implementation method of this a kind of many scenes Digital Television, and its specific implementation process is:
1) dispose at the scene a large amount of video cameras, all video cameras are taken respectively and are formed different video-audio signals;
2) video-audio signal converges to the cut bank that possesses the audio-visual output of multichannel;
3) video-audio signal switches to two-way output video-audio signal at least in cut bank;
4) every road output video-audio signal all carries out the spatial scalable Video coding SVC coding of SD and high definition resolution by digital television system, forms the many scenes TV program stream broadcast singal that comprises multichannel audio-video frequency;
5) spectators receive many scenes TV program stream by digital TV terminal, and select any one or more video in the control figure television terminal to decode according to the custom of oneself, play on TV.
The detailed process of the SVC coding in described step 4) is: every road HD video is processed through down-sampling and is formed the SD video, carries out compression coding as basic layer and forms basic layer bit stream; On the basis of enhancement layer coding being predicted with basic layer coding result, high-definition video signal is encoded, form enhancement layer bitstream; Basic layer and enhancement layer bitstream are carried out multiplexing, the spatial scalable coding code stream that formation has SD and high definition resolution.
Digital TV terminal broadcast mode in described step 5) comprises following pattern: the picture-in-picture of single scene played in full screen, two scenes is play, is play greater than " mosaic " formula split screen of two scenes.
Digital TV terminal in described step 5) is set up the pmt table that comprises each scene SVC video code flow and audio code stream, forms a programs stream, then broadcasts.
Described digital TV terminal carries out the SVC decoding to its basic layer and enhancement layer when the played in full screen of single scene, form HD video; Digital TV terminal is only decoded to basic layer segment in this scene video stream when playing more than or equal to the scene of two with the low resolution window scheme, forms the SD video, shows by window.
Export sound accompaniment audio frequency corresponding to its scene in the time of described output multi-channel video, simultaneously each road sound accompaniment audio frequency is encoded when coding, form audio stream corresponding to each scene; If each scene adopts identical sound accompaniment, only keep corresponding each scene video of one road sound accompaniment.
The beneficial effect that the present invention compared with prior art produces is:
The implementation method of a kind of many scenes Digital Television of the present invention is in the situation that bandwidth has a small amount of increase, realized providing simultaneously the ability of each scene SD and HD video, the digital TV terminals such as set-top box do not need whole scenes are carried out the high definition decoding when many scenes show, solved the problem of the digital TV terminal disposal ability deficiencies such as set-top box, realized that spectators can appreciate the dream of a plurality of scene HD videos simultaneously.
Description of drawings
Accompanying drawing 1 is that the TV of prior art is relayed live block diagram.
Accompanying drawing 2 is that TV of the present invention is relayed live block diagram.
Accompanying drawing 3 is video encoding/decoding method schematic diagrames of the present invention.
Embodiment
Be described in detail below below in conjunction with the implementation method of accompanying drawing to a kind of many scenes Digital Television of the present invention.
Difference with the prior art of the present invention is that the video-audio signal exported expands to multichannel from one the tunnel, thereby can reflect a plurality of scenes.A kind of implementation method of many scenes Digital Television is provided as shown in Figure 2, and wherein 201,202 to 203 is a large amount of video cameras of field deployment, so that different objects in the scene are made a video recording, perhaps same target is taken from different perspectives.For example in tennis tournament, respectively to the competition field from both sides, centre and top take, different cameras is taken distant view and close shot, other video camera is taken spectators, judge etc.; 204,205 to 206 is that these video cameras are taken respectively the formation video-audio signal; Video-audio signal converges to the cut bank 207 that possesses the audio-visual output of multichannel; Many scenes are relayed instructor in broadcasting personnel 208 operation cut bank 207, and each road video-audio signal 204,205 to 206 of input is selected to switch, and form 2 the road or the output video-audio signal 209 of multichannel more; Relay live video-audio signal by digital television system 210 broadcast of encoding, form the many scenes TV program stream broadcast singal 211 that comprises multichannel audio-video frequency; Spectators 215,216 and 217 are watching when relaying live, the digital TV terminals 212 such as its set-top box, 213 and 213 receive many scenes TV program stream, the digital TV terminals such as spectators' controller top box therefrom select any one the road to decode to multi-channel video, and play on TV, make each spectators need to watch different live videos and sound according to the appreciation of oneself.
Based on custom, generally need to provide 2 to 4 road videos to spectators, selected to switch by the video that the instructor in broadcasting provides from each video camera.
When Video coding, the object of taking due to different scene videos is not identical, lacks correlation between video, therefore carries out separately absolute coding.This is not identical with multi-view video coding (MVC) purpose and characteristic, and MVC is that a plurality of video cameras are from the same object of a plurality of adjacent angle shots, to form the video display effect that has the 3D interaction capability with spectators.Therefore there is strong correlation in its each visual angle vision signal, adopts between the visual angle predictive coding to eliminate information redundancy between its visual angle.And many scenes TV that the present invention proposes is that the scene video of the different objects of a plurality of reflections is provided to spectators, and each scene video correlation is very low or do not have, and therefore can only carry out separately absolute coding.
Its specific coding process as shown in Figure 3, wherein 301 is a certain road HD videos that cut bank 207 is exported; Form SD video 303 by down-sampling 302; SD video 303 forms basic layer bit stream through basic layer coding 304; Result with basic layer coding predicts 305 to enhancement layer coding 306, and HD video 301 is carried out enhancement layer coding, forms enhancement layer bitstream; Basic layer bit stream and enhancement layer bitstream are carried out multiplexing 307, form the video transmission stream 308 of this scene, further, form the spatial scalable coding code stream with SD and high definition resolution.By the prediction of basic layer to enhancement layer, make the binary encoding bandwidth only increase by 10% left and right than directly carrying out the high definition coding, make a plurality of scene video bandwidth be no more than the bearing capacity of transmission channel.
The Digital Television head-end system forms one and comprises the Program Map Table (pmt table) that cut bank is exported each scene video stream and audio stream information, thereby formed many scenes TV programme of a compatible existing digital television system of cover, and broadcasted by the Digital Television Station system.
The digital TV terminals such as set-top box adopt plurality of display modes when playing many scenes TV programme, comprise selecting single scene to carry out played in full screen, select 2 scenes to carry out picture-in-picture and play, and select a plurality of scenes to carry out the modes such as " mosaic " split screen broadcast.
In order to realize the broadcast of many scenes TV programme, when the digital TV terminals such as set-top box receive many scenes TV programme, extract video flowing and the audio stream of each scene the program transport streams from its transmission frequency.According to playing display mode, can select wherein 1 scene video to decode shows in full frame mode, perhaps select 2 or more scenes to decode, with picture-in-picture or with " mosaic " form, each scape is displayed the play on television screen, audio stream only selects 1 the tunnel to decode.
In order to obtain tv effect more true to nature, should provide to spectators the HD video of each scene.But the digital TV terminals such as set-top box generally do not possess the ability that decoding simultaneously surpasses 2 road HD videos, and the demonstration that surpasses 2 scenes can't be provided so simultaneously.Analyze the various display modes of many scenes TV, do not need can not have 2 or above video high definition demonstration simultaneously during broadcast yet, at most that a scene is carried out the high definition demonstration in full frame mode, other scene only need to show with window form on screen with low resolution, and perhaps each scene all forms " mosaic " display mode on screen with low resolution.
(need to present in full frame high definition mode, be referred to as full frame scene) when spectators appreciate one of them scene, the digital TV terminals such as set-top box extract video flowing and the audio stream of this scene from this programs.Audio stream directly decodes broadcast, and basic layer and the enhancement layer bitstream that comprises in video flowing carried out the SVC decoding, forms HD video, outputs to high definition broadcast on video screen.
Carry out full frame high definition when appreciating when spectators need to switch to other scene, the digital TV terminals such as set-top box extract the broadcast of decoding of the video flowing of spectators' given scenario and audio stream.
When spectators wish to appreciate a certain scene (full frame scene) with full frame high definition, when simultaneously monitoring another scene (window scene) in the picture-in-picture mode, the digital TV terminal such as set-top box extracts respectively video flowing and the corresponding audio stream of full frame scene of these 2 scenes.The audio stream of full frame scene directly decodes broadcast; Basic layer and enhancement layer to the video flowing of full frame scene carry out the SVC decoding, and the formation HD video is in played in full screen; To only decode wherein basic layer of the video flowing of picture-in-picture scene, form the SD video, show with window form on television screen, form the picture-in-picture display mode.
When spectators wish to appreciate a certain scene (full frame scene) with full frame high definition, when simultaneously monitoring another a few scene (window scene) in a plurality of picture-in-picture modes, the digital TV terminal such as set-top box extracts respectively video flowing and the corresponding audio stream of full frame scene of these scenes.The audio stream of full frame scene directly decodes broadcast; Basic layer and enhancement layer to the video flowing of full frame scene carry out the SVC decoding, and the formation HD video is in played in full screen; To only decode wherein basic layer of the video flowing of each picture-in-picture scene, form the SD video, show with a plurality of window form on television screen, form the picture-in-picture display mode.
When spectators wish to see simultaneously each scene that television relay provides, with " mosaic " form, each scape is displayed the play on television screen.The digital TV terminal such as set-top box extracts respectively video flowing and the selected corresponding audio stream of a certain scene of user of all scenes in program stream.Audio stream directly decodes broadcast; To only decode wherein basic layer of the video flowing of each scene, form the SD video, show in " mosaic " modes such as four split screens, six split screens on television screen.
The present invention is by adopting scalable video, in the situation that bandwidth has a small amount of increase, realized providing simultaneously the ability of each scene SD and HD video, the digital TV terminals such as set-top box do not need whole scenes are carried out the high definition decoding when many scenes show, have solved the problem of the digital TV terminal disposal ability deficiencies such as set-top box.
In relaying at the scene, the audio signal that derives from different cameras may be different.Therefore export sound accompaniment audio frequency corresponding to its scene when instructor in broadcasting's output multi-channel video, simultaneously each road sound accompaniment audio frequency is encoded when coding, form audio stream corresponding to each scene.If each scene adopts identical sound accompaniment, only keep corresponding each scene video of one road sound accompaniment.
Claims (6)
1. the implementation method of scene Digital Television more than a kind, it is characterized in that: its specific implementation process is:
1) dispose at the scene a large amount of video cameras, all video cameras are taken respectively and are formed different video-audio signals;
2) video-audio signal converges to the cut bank that possesses the audio-visual output of multichannel;
3) video-audio signal switches to two-way output video-audio signal at least in cut bank;
4) every road output video-audio signal all carries out the spatial scalable Video coding SVC coding of SD and high definition resolution by digital television system, forms the many scenes TV program stream broadcast singal that comprises multichannel audio-video frequency;
5) spectators receive many scenes TV program stream by digital TV terminal, and select any one or more video in the control figure television terminal to decode according to the custom of oneself, play on TV.
2. the implementation method of a kind of many scenes Digital Television according to claim 1, it is characterized in that: the detailed process of the SVC coding in described step 4) is: every road HD video is processed through down-sampling and is formed the SD video, carries out compression coding as basic layer and forms basic layer bit stream; On the basis of enhancement layer coding being predicted with basic layer coding result, high-definition video signal is encoded, form enhancement layer bitstream; Basic layer and enhancement layer bitstream are carried out multiplexing, the spatial scalable coding code stream that formation has SD and high definition resolution.
3. the implementation method of a kind of many scenes Digital Television according to claim 2, it is characterized in that: the digital TV terminal broadcast mode in described step 5) comprises following pattern: the picture-in-picture of single scene played in full screen, two scenes is play, is play greater than " mosaic " formula split screen of two scenes.
4. the implementation method of a kind of many scenes Digital Television according to claim 3, it is characterized in that: the digital TV terminal in described step 5) is set up the pmt table that comprises each scene SVC video code flow and audio code stream, form a programs stream, then broadcast.
5. the implementation method of a kind of many scenes Digital Television according to claim 3 is characterized in that: described digital TV terminal carries out the SVC decoding to its basic layer and enhancement layer, the formation HD video when the played in full screen of single scene; Digital TV terminal is only decoded to basic layer segment in this scene video stream when playing more than or equal to the scene of two with the low resolution window scheme, forms the SD video, shows by window.
6. the implementation method of a kind of many scenes Digital Television according to claim 3, it is characterized in that: export sound accompaniment audio frequency corresponding to its scene in the time of described output multi-channel video, simultaneously each road sound accompaniment audio frequency is encoded when coding, form audio stream corresponding to each scene; If each scene adopts identical sound accompaniment, only keep corresponding each scene video of one road sound accompaniment.
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Application publication date: 20130522 |