This article's factual accuracy may be compromised due to out-of-date information. Please help update this article to reflect recent events or newly available information.(January 2012)
DVB 3D-TV is a new standard that partially came out at the end of 2010 which included techniques and procedures to send a three-dimensional video signal through actual DVB transmission standards (Cable, Terrestrial or Satellite). Currently there is a commercial requirement text for 3D TVbroadcasters and Set-top box manufacturers, but no technical information is in there.
DVB 3D-TV Logo
Nowadays 3D television technology is already in its first steps regarding its standardization, now the major 3D market is in theaters and Blu-ray Disc players with stereoscopic systems, but in the near future it will be extended to diffusion, and later Free viewpoint television will come into our homes, which means the need of new coding and transmission standards.
The implantation of first generation of DVB 3D-TV will be staggered:
Phase 1: the first standard will have forward compatibility with actual HD systems with just some firmware actualization at HD systemsset-top boxes and, of course, the need for 3D panels; however signaling or distribution formats should not prevent future expansion to support new 3D encoding formats. This system only works with stereoscopicFrame sequential 3D systems. Requirements for this system, which is called Frame compatible format, are included in the commercial requirements of DVB. Some broadcasters like Sky3D[1] or Canal+3D[2] are already using this technology, which is largely thought for PayTV.
Phase 2: the use of new broadcasting requirements for specific 3D streams won't be compatible with actual 3D STB, but it would be service compatible with 2D STB if no specific 3D STB is available by using Scalable Video Coding and Multiview Video Coding techniques, i.e. not having to simulcast 2D and 3D and occupying only one channel by using a unique video stream with a normal 2D base stream and an adjustable 3D depth layer. This system is called service compatible and is designed for Free-to-air group of broadcasters.
Regarding how a signal once it's decoded is sent to the display, current stereoscopic systems use a frame-sequential 3D signal. Left and right frames are sent alternately to the display and by diverse systems like shuttered glasses or polarized glasses are then shown to each eye. This involves that the real frame frequency halves the video frame frequency.
Technical featuresedit
Frame compatibleedit
In Phase 1 system, only frame-sequential 3D is allowed, using frame compatible (CFC) format. This is made by a spatial multiplex that combines the left and right video sequences in one HD stream which is coded with H.264 as a single image. This allows to handle video as normal HD video using typical channels and interfaces like HDMI, which is possible in this 1.4a version. Frame compatible (CFC) model is also compatible with 2D HD mode in the same channel, adding some signalling for switching from 2D to 3D.
There are basically two ways to do spatial multiplex: Side by side and Top and bottom, but additional spatial multiplex formats have been proposed in order to improve picture quality by providing a better balance between the V and H resolution.
Side by sideedit
Side by side format
Side by side (SbS) format just put the left and right images one next to the other in an HD image. Because of this, a horizontal decimate is required which causes halving of horizontal definition. DVB 3D-TV supports following SbS formats:
1080i @ 50 Hz Side-by-Side
720p @ 50 Hz Side-by-Side
720p @ 59.94 / 60 Hz Side-by-Side
1080p @ 23.97 / 24 Hz Side-by-Side
1080i @ 59.94 / 60 Hz Side-by-Side
Top and bottomedit
Top and bottom format
Top and Bottom (TaB) format put left and right images one above the other in a HD image. In this case, vertical decimate is required which causes halving of vertical definition. DVB 3D-TV supports following TaB formats:
1080p @ 23.97 / 24 Hz Top-and-Bottom
720p @ 59.94 / 60 Hz Top-and-Bottom
Not every spatial multiplex format is frame compatible with actual systems. Following formats are non frame compatible:
720p @ 50 /60 Hz
1080p @ 24 Hz
Graphics and textedit
There are basically two types of text displayed on screen that need additional broadcasting information to be displayed on a 3D display:
Subtitling: (or captions) are text and visual elements that can be overlaid on the picture. The reconstruction of the composite image which includes the captions needs to be done in the STB. Using standards for sub-titling already available for DVB broadcast systems, in addition to depth information provided by the broadcasters, the STB should position correctly the captions into the L and R pictures mixed with the original 3D image. The DVB 3D-TV subtitling solution will use existing DVB subtitling implementations and will be backward compatible with 2D streams.
Service guide: the STB generates multimedia content such as EPG for his service guide, which combines the use of data preloaded into the receiver with data provided by the broadcaster, in the form of service information. Depth information will be extracted of the captions, displaying the graphics in the same depth.
Signalingedit
The main function of signaling for frame compatible 3DTV is to signal the presence of a 3D or 2D video stream. It must be also possible to include in the broadcast signal information about the pixel arrangement used to decimate the master HDTV full samples/line pictures to create the anamorphic version, if 3D is available. It's interesting to signal also for 3D receivers the 3D events that are available, for which 3D availability should appear on EPG. For future service compatible (CSC) 3DTV, signal that a 3D version of a 2D service or event is being simulcast, and vice versa will be needed.
Multiview video coding is a compression standard appended from H.264/MPEG-4 AVC which allows send stereoscopic 3D video without resolution loss due to spatial multiplex, and reducing overhead of sending 2 HD images up to 50% and in a single video stream. It is used in Blu-ray players, but at the moment it's not applicable to broadcast because of the processing time for encoding, which uses motion compensation algorithms. Nevertheless, there have been some experiments with MVC 3D broadcast by Fraunhofer society[3] over 2nd generation DVB (DVB-T2, DVB-C2 and DVB-S2).
Total Free viewpoint television can be reached by capturing multiple views and extracting 2D+depth information from them to create a 3D model of the scene. Currently this system is being investigated, but the coding complexity and great bandwidth requirements make current broadcasting applications using Multiview Video Coding impractical, so a totally new compression scheme and capture techniques need to be investigated.
^. Archived from the original on 2010-10-02. Retrieved 2010-12-02.
^"MVC 3D signal broadcast". Fraunhofer society. 2010. Retrieved 2010-12-02.
External linksedit
Stereo 3D Broadcast with MVC, Heinrich Hertz Insitiute (Fraunhofer society)
Freeview 3D project for Japan 2022 World Cup
The Biggest 3D Video's Library
January 01, 1970
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This article s factual accuracy may be compromised due to out of date information Please help update this article to reflect recent events or newly available information January 2012 DVB 3D TV is a new standard that partially came out at the end of 2010 which included techniques and procedures to send a three dimensional video signal through actual DVB transmission standards Cable Terrestrial or Satellite Currently there is a commercial requirement text for 3D TV broadcasters and Set top box manufacturers but no technical information is in there DVB 3D TV Logo Nowadays 3D television technology is already in its first steps regarding its standardization now the major 3D market is in theaters and Blu ray Disc players with stereoscopic systems but in the near future it will be extended to diffusion and later Free viewpoint television will come into our homes which means the need of new coding and transmission standards Contents 1 Implantation 2 3DTV signals 2 1 Frame sequential 3 Technical features 3 1 Frame compatible 3 2 Side by side 3 3 Top and bottom 3 4 Graphics and text 3 5 Signaling 4 3DTV broadcast in future 4 1 Multiview 4 2 Free viewpoint 5 See also 6 References 7 External linksImplantation editThe implantation of first generation of DVB 3D TV will be staggered Phase 1 the first standard will have forward compatibility with actual HD systems with just some firmware actualization at HD systems set top boxes and of course the need for 3D panels however signaling or distribution formats should not prevent future expansion to support new 3D encoding formats This system only works with stereoscopic Frame sequential 3D systems Requirements for this system which is called Frame compatible format are included in the commercial requirements of DVB Some broadcasters like Sky3D 1 or Canal 3D 2 are already using this technology which is largely thought for PayTV Phase 2 the use of new broadcasting requirements for specific 3D streams won t be compatible with actual 3D STB but it would be service compatible with 2D STB if no specific 3D STB is available by using Scalable Video Coding and Multiview Video Coding techniques i e not having to simulcast 2D and 3D and occupying only one channel by using a unique video stream with a normal 2D base stream and an adjustable 3D depth layer This system is called service compatible and is designed for Free to air group of broadcasters 3DTV signals edit nbsp Diagram of an CSC or FCC 3DTV system Matrix of signal formats for 3DTV Compatibility level 1st generation 3DTV 2nd generation 3DTV 3rd generation 3DTV Level 4 HD service compatible CSC 2D HD MVC L R formed by matrixing depth info 2D HD MVC Depth occlusion and transparency data Level 3 HD Frame compatible compatible FCC Frame compatible MPEG resolution extension ex SVC Level 2 Conventional HD Frame compatible CFC L and R in same HD frame Level 1 Conventional HD display compatible CDC Color anaglyph Frame sequential edit nbsp Frame sequential 3D video Regarding how a signal once it s decoded is sent to the display current stereoscopic systems use a frame sequential 3D signal Left and right frames are sent alternately to the display and by diverse systems like shuttered glasses or polarized glasses are then shown to each eye This involves that the real frame frequency halves the video frame frequency Technical features editFrame compatible edit In Phase 1 system only frame sequential 3D is allowed using frame compatible CFC format This is made by a spatial multiplex that combines the left and right video sequences in one HD stream which is coded with H 264 as a single image This allows to handle video as normal HD video using typical channels and interfaces like HDMI which is possible in this 1 4a version Frame compatible CFC model is also compatible with 2D HD mode in the same channel adding some signalling for switching from 2D to 3D There are basically two ways to do spatial multiplex Side by side and Top and bottom but additional spatial multiplex formats have been proposed in order to improve picture quality by providing a better balance between the V and H resolution Side by side edit nbsp Side by side format Side by side SbS format just put the left and right images one next to the other in an HD image Because of this a horizontal decimate is required which causes halving of horizontal definition DVB 3D TV supports following SbS formats 1080i 50 Hz Side by Side 720p 50 Hz Side by Side 720p 59 94 60 Hz Side by Side 1080p 23 97 24 Hz Side by Side 1080i 59 94 60 Hz Side by Side Top and bottom edit nbsp Top and bottom format Top and Bottom TaB format put left and right images one above the other in a HD image In this case vertical decimate is required which causes halving of vertical definition DVB 3D TV supports following TaB formats 1080p 23 97 24 Hz Top and Bottom 720p 59 94 60 Hz Top and Bottom Not every spatial multiplex format is frame compatible with actual systems Following formats are non frame compatible 720p 50 60 Hz 1080p 24 Hz Graphics and text edit There are basically two types of text displayed on screen that need additional broadcasting information to be displayed on a 3D display Subtitling or captions are text and visual elements that can be overlaid on the picture The reconstruction of the composite image which includes the captions needs to be done in the STB Using standards for sub titling already available for DVB broadcast systems in addition to depth information provided by the broadcasters the STB should position correctly the captions into the L and R pictures mixed with the original 3D image The DVB 3D TV subtitling solution will use existing DVB subtitling implementations and will be backward compatible with 2D streams Service guide the STB generates multimedia content such as EPG for his service guide which combines the use of data preloaded into the receiver with data provided by the broadcaster in the form of service information Depth information will be extracted of the captions displaying the graphics in the same depth Signaling edit The main function of signaling for frame compatible 3DTV is to signal the presence of a 3D or 2D video stream It must be also possible to include in the broadcast signal information about the pixel arrangement used to decimate the master HDTV full samples line pictures to create the anamorphic version if 3D is available It s interesting to signal also for 3D receivers the 3D events that are available for which 3D availability should appear on EPG For future service compatible CSC 3DTV signal that a 3D version of a 2D service or event is being simulcast and vice versa will be needed 3DTV broadcast in future editMultiview edit Main article Multiview Video Coding Multiview video coding is a compression standard appended from H 264 MPEG 4 AVC which allows send stereoscopic 3D video without resolution loss due to spatial multiplex and reducing overhead of sending 2 HD images up to 50 and in a single video stream It is used in Blu ray players but at the moment it s not applicable to broadcast because of the processing time for encoding which uses motion compensation algorithms Nevertheless there have been some experiments with MVC 3D broadcast by Fraunhofer society 3 over 2nd generation DVB DVB T2 DVB C2 and DVB S2 Free viewpoint edit Main article Free viewpoint television Total Free viewpoint television can be reached by capturing multiple views and extracting 2D depth information from them to create a 3D model of the scene Currently this system is being investigated but the coding complexity and great bandwidth requirements make current broadcasting applications using Multiview Video Coding impractical so a totally new compression scheme and capture techniques need to be investigated See also edit3D Television DVB 3D display 3 D film Digital 3D Stereoscopic Video Coding 3D Blu ray Disc EPG Free viewpoint television Multiview Video CodingReferences editDVB Commercial requirements for 3D TV broadcasting available at 1 DVB 3D TV seminar presentation by David Wood available at 2 Sky 3DTV site Retrieved 2010 12 02 Canal 3D site Archived from the original on 2010 10 02 Retrieved 2010 12 02 MVC 3D signal broadcast Fraunhofer society 2010 Retrieved 2010 12 02 External links editStereo 3D Broadcast with MVC Heinrich Hertz Insitiute Fraunhofer society DVB 3D TV workshop page Information and news about 3DTV Freeview 3D project for Japan 2022 World Cup The Biggest 3D Video s Library Retrieved from https en wikipedia org w index php title DVB 3D TV amp oldid 1082816380, wikipedia, wiki, book, books, library,
