KR101818141B1 - Method for providing of service compatible mode in digital broadcasting - Google Patents

Abstract

The present invention relates to a service compatibility scheme of 3D stereoscopic digital broadcasting in a broadcast MPEG-2-TS format used for digital TV transmission and reception.
To this end, the present invention proposes a detailed information transmission scheme that supports both a TS-level multiplexing scheme and an ES-level multiplexing scheme when multiplexing left and right compressed bitstreams when a service compatible scheme is implemented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for transmitting a service-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a service compatibility method of 3D stereoscopic digital broadcasting in an MPEG-2 Transport Stream (TS) format used for digital TV transmission and reception.

Korea has selected the Advanced Television Systems Committee (ATSC) standard in North America, which is an 8-VSB system, in November 1997, and has been developing related core technology, field test and trial broadcasting. Since 2001, Broadcasting and digital broadcasting are simultaneously being broadcast, but in 2012, conversion to digital broadcasting will be completed.

ATSC refers to a committee or standard for developing digital television broadcasting standards in the United States. ATSC standards are currently determined as national standards for the United States, Canada, Mexico, and South Korea, and are intended for use by other countries, including many South American countries. Digital broadcasting standards include DVB developed in Europe in addition to ATSC, and ISDB in Japan.

The ATSC digital broadcasting standard, which can transmit high quality video, audio, and ancillary data, can transmit data at a data rate of 19.39 Mbps for a terrestrial broadcast channel of 6 MHz and a data rate of about 38 Mbps for a cable TV channel. The video compression technology used in the ATSC method uses the ISO / IEC 13818-2 MPEG-2 video standard, and uses MPEG-2 MP @ HL, that is, the Main Profile and High Level standards as the compression format. Formats, and restrictions.

The following describes the transmission modes available when performing new broadcasting while maintaining compatibility with existing broadcasting channels such as 3D stereoscopic broadcasting, UHD TV broadcasting, and multi view broadcasting in the MPEG-2 TS format for broadcasting used for digital TV transmission and reception. Let's look at it. Hereinafter, 3D stereoscopic broadcasting, UHD TV broadcasting, and multi-view broadcasting will be collectively referred to as composite video broadcasting. As a transmission mode usable in the MPEG-2 TS format, a frame-compatible mode and a service-compatible mode are distinguished. In this way, when two transmission modes are used in the digital broadcasting, the receiving terminal needs to recognize the transmission mode used in the transmitting terminal.

A problem to be solved by the present invention is to propose a method of transmitting detailed information of 3D broadcasting.

Another problem to be solved by the present invention is to provide a method of transmitting detailed information of a service compatibility method among transmission modes of 3D broadcasting.

Another object of the present invention is to provide a detailed information transmission scheme that supports both a TS level multiplexing scheme and an ES level multiplexing scheme when multiplexing left and right compressed bit streams when a service compatible scheme is implemented.

To this end, the detailed information transmission scheme of the present invention proposes a detailed information transmission scheme that supports both a TS level multiplexing scheme and an ES level multiplexing scheme when multiplexing left and right compressed bitstreams when a service compatible scheme is implemented.

The detailed information transmission scheme according to the present invention proposes a transmission scheme of detailed information supporting both a TS level multiplexing scheme and an ES level multiplexing scheme when multiplexing left and right compressed bitstreams when implementing a service compatible scheme in 3D broadcasting .

When 3D broadcasting is performed according to the detailed information transmission method according to the present invention, it is possible to maintain compatibility with existing broadcasting using an existing broadcasting system, and to efficiently perform 3D broadcasting according to various service compatibility mode environments including a TS level multiplexing method and an ES level multiplexing method Broadcast transmission and reception can be implemented.

1 illustrates a frame compatibility mode according to an embodiment of the present invention,
2 illustrates a service compatibility mode according to an embodiment of the present invention,
FIG. 3 illustrates a multiplexing method of the TS level and a multiplexing method of the ES level in the service compatible mode according to the embodiment of the present invention,
FIG. 4 illustrates a structure of a program map table (PMT) syntax according to an embodiment of the present invention,
FIG. 5 illustrates a service_compatible_stereoscopic_video_descriptor according to an embodiment of the present invention,
6 illustrates a stereoscopic stream descriptor according to an embodiment of the present invention,
7 shows an MPEG2_video_3d_frame_frame_packing_arrangement_descriptor according to an embodiment of the present invention,
8 is a flowchart illustrating a process of performing multiplexing in a service compatibility mode according to an embodiment of the present invention,
9 illustrates a process of separating bit streams of left and right images according to an MVC bit string assembling method in an ES level bit stream multiplexing method according to an embodiment of the present invention,
Figure 10 illustrates MVC bit string assembling and de-assembling.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

First, let's look at the kinds of digital broadcasting. Generally, digital broadcasting is classified into 3D stereoscopic broadcasting, UHD (Ultra High Definition) TV broadcasting, and Multi-view broadcasting.

Instead of transmitting one screen of HD broadcasting, 3D stereoscopic broadcasting transmits two screens. UHD broadcasting consists of four screens (in case of 4k) and multi-view broadcasting consists of two or more screens.

In order to transmit stereoscopic three-dimensional stereoscopic images, 3D stereoscopic broadcasting has a method in which a packet identifier (PID: Packet Identifier) in the MPEG2-TS is added to the left and right images one by one and multiplexed and transmitted. UHD images are usually close to 4000 (4k · 3840x2160) to 8000 (8k · 7680x4320) in the number of pixels in the horizontal and vertical directions. Since the resolution of the screen depends on the number of pixels called pixels, the UHD image is 4 times more vivid than the HD (2k · 1920x1080) on a 4k basis. It differs from the 8k by 16 times in terms of sharpness. At 60Hz, 60 frames per second are transmitted at the screen refresh rate, that is, the frame rate per second, while the HD is 30Hz, so that a more natural and dynamic screen can be enjoyed.

Multi-view broadcasting can be viewed as a 3D stereoscopic video by combining two images at different angles, up, down, left, and right depending on the viewing angle of a viewer. When a television has a multi-view display device, the person on the left side sees the left side of the actor when the actor appears on the screen, and the person on the right side sees the right side face of the actor as a 3D stereoscopic image. That is, it is an advanced form of 3D stereoscopic broadcasting.

The present invention proposes transmission and reception standards for a proper transmission mode when performing a new broadcasting while maintaining compatibility with existing broadcasting channels when using any one of 3D stereoscopic broadcasting, UHD TV broadcasting and multi view broadcasting .

Hereinafter, a frame-compatible mode will be described and a service-compatible mode will be described.

FIG. 1A shows a frame compatibility mode, and FIG. 1B shows an example of a method of compositing images to configure a frame compatibility mode. 1A and 1B illustrate examples of 3D stereoscopic broadcasting and UHD broadcasting and multi view broadcasting can be expanded in a similar manner. The frame compatibility mode will be described in detail with reference to FIGS. 1A and 1B.

Referring to FIG. 1B, the frame compatible mode transmits one frame in which the right and left images are combined into one transmission band. Therefore, it is possible to maintain the same transmission / reception format as that used in the conventional HD broadcasting. However, the former HD broadcasting transmits video to the whole area, while the frame compatible mode broadcasts the combined image by the number of images. That is, as shown in FIG. 1B, the left and right images can be combined into one frame in various ways. As shown in FIG. 2B, half of a frame may be divided and synthesized, or may be divided and synthesized on a pixel-by-pixel basis as shown in FIG. 1B (b). Alternatively, as shown in FIG. 1B (c), frames can be transmitted while alternating left and right images in chronological order while maintaining the frames. In the case of (a) and (b) of FIG. 1 (b), a process of reducing each image is required since it is synthesized by the number of images in one frame. In the case of FIG. 1 (c), the frame- Or adjust the bitrate of the video compression. There are various ways to synthesize images. In the 3D stereoscopic image as shown in FIG. 1B, the left and right images may be changed or may be mixed in units of diagonal pixels.

For example, in 3D stereoscopic broadcasting, since the left and right images are transmitted using one transmission band, the resolution of the transmitted image is reduced to 1/2 as compared with the case of transmitting one image frame, ((A) and (b) of FIG. 1B). Or more data must be transmitted to the same bandwidth, so that the compression ratio is increased and the image quality is lowered or the frame rate is lowered (FIG. 1B (c)).

2 shows a service compatibility mode. Hereinafter, the service compatibility mode will be described in detail with reference to FIG. FIG. 2 shows the 3D stereoscopic broadcasting as a reference, and UHD broadcasting and multi-view broadcasting can be expanded in a similar manner.

Referring to FIG. 2, in the service compatibility mode, the left image frame and the right image frame are separately compressed and transmitted in one transmission band instead of image synthesis. That is, as shown in FIG. 2, the left image frame and the right image frame are compressed by respective compression methods, and the compressed left and right image frames are transmitted in one transmission band. In order to transmit two or more compressed images in a limited transmission band, one image is compressed so as to be compatible with the existing HD broadcasting, while the other image is encoded and transmitted with a better compression ratio. Or one of the left image and the right image is transmitted at a high resolution and the other image is transmitted using a low resolution. For example, the left image is encoded and transmitted in the MPEG-2 Main profile, and the right image is encoded in the MPEG-4 AVC / H.264 High profile. In addition, when the low resolution is used, the left image transmits a video stream at a resolution of 1080i @ 60Hz and the right image transmits a video stream at a resolution of 720p @ 60Hz. In addition, the left image is left as is, the right image is vertically or horizontally sub-sampled, and the receiving unit reconstructs the right image sampled by the resolution of the left image, and creates a stereo image.

In this way, when a new broadcasting is performed while maintaining compatibility with the existing broadcasting channel in the digital broadcasting, the transmission mode of the composite broadcasting is divided into the frame compatibility mode and the service compatibility mode, and the transmitting terminal uses one of the two transmission modes And transmits the compressed image to the receiving end. The receiver must recognize the transmission mode used by the transmitter in order to decode the received compressed image. In a conventional broadcast receiving system, which can not process a composite image, it is necessary to ignore a secondary view of the received composite image and to reproduce only the primary view. Thus, it is possible to selectively receive the composite broadcast while maintaining compatibility with the existing broadcast channel.

FIG. 3 illustrates a left and right image multiplexing method used in a service compatibility mode according to an embodiment of the present invention. Hereinafter, a left and right image multiplexing method used in a service compatibility mode according to an embodiment of the present invention will be described with reference to FIG.

 Referring to FIG. 3, the multiplexing scheme used in the service compatibility mode is classified into a multiplexing scheme at the TS level and a multiplexing scheme at the ES level.

In the TS-level multiplexing scheme, it is necessary to specify a PID of a reference image by allocating different PIDs to a packet stream (PES: Packetized Elementary Stream) obtained by packetizing an elementary stream (ES) of left and right images . That is, as shown in FIG. 3, it can be seen that different PIDs are assigned to the left image and the right image, respectively.

On the other hand, in the ES level multiplexing scheme, a bit stream (ES) compressed for each of the left and right images is merged into one elementary stream (ES) and transmitted using one PID. Therefore, the ES level multiplexing method needs a method that can distinguish the left and right video bit streams from one elementary stream (ES). As an example, a byte offset can be used. That is, according to FIG. 3, one PID is assigned to the left image and the right image, and an offset for distinguishing the left image and the right image is described. That is, the ES level multiplexing scheme is a method of assembling compressed bit streams of right and left images into one compressed bit stream (ES), assigning one PID to a packetized PES and transmitting the same, (De-assembling or bitstream extraction) into a compressed bit stream of a bit stream. For example, MVC bitstream assembling is used. Or an additional syntax such as Byte Offset to separate the two images. FIGS. 9 and 10 illustrate the separation process and the combination and separation of MVC bitstream combination when using the MVC bitstream combination.

The present invention is one embodiment in which identification information for recognizing reception of a 3D image in a receiving system capable of processing a 3D image is included in system information and received. PSI / PSIP (Program Specific Information / Program and System Information Protocol) is applied as the system information, but the present invention is not limited thereto. That is, a protocol for transmitting system information in a table format, regardless of its name.

PSI is a system standard of MPEG-2 defined for classifying channels and programs, and PSIP is an Advanced Television Systems Committee (ATSC) standard for classifying channels and programs.

In one embodiment, the PSI may include a Program Association Table (PAT), a Conditional Access Table (CAT), a Program Map Table (PMT), and a Network Information Table (NIT).

The PAT is special information transmitted by a packet having a PID of '0', and transmits PID information of the corresponding PMT and PID information of the NIT for each program. The CAT transmits information about the pay-TV system used by the transmitting side. The PMT transmits the program identification number, PID information of a transport stream packet in which individual bit streams such as video and audio constituting the program are transmitted, and PID information to which the PCR is transmitted. The NIT transmits the information of the actual transmission network. For example, the program number and the PID of the PMT are obtained by parsing the PAT table having the PID of 0. When the PMT obtained from the PAT is parsed, the correlation between the components constituting the program can be known.

FIG. 4 shows a structure of a program map table (PMT) syntax according to an embodiment of the present invention. Hereinafter, the structure of the PMT syntax according to an embodiment of the present invention will be described in detail with reference to FIG.

In FIG. 4, the table_id field is a table identifier, and an identifier for identifying the PMT can be set. The section_syntax_indicator field is an indicator that defines the PMT section format. The section_length field indicates the section length of the PMT.

The program_number field is information corresponding to the PAT, and the program number is displayed. The version_number field indicates the version number of the PMT. The current_next_indicator field is a recognizer indicating whether or not the current table section is applicable.

The section_number field indicates the section number of the current PMT section when the PMT is transmitted divided into one or more sections. The last_section_number field indicates the last section number of the PMT. The PCR_PID field indicates the PID of the packet that carries the program clock reference (PCR) of the current program.

The program_info_length field indicates the descriptor length information immediately after the program_info_length field in the number of bytes. That is, it indicates the length of the descriptors included in the first loop. The stream_type field indicates the kind of element stream and encoding information contained in the packet having the PID value indicated in the next elementary_PID field. The elementary_PID field indicates the identifier of the elementary stream, that is, the PID value of the packet including the corresponding elementary stream. The ES_Info_length field indicates the descriptor length information immediately after the ES_Info_length field in the number of bytes. That is, it indicates the length of the descriptors included in the second loop.

In addition, according to FIG. 4, a descriptor related to a specific program number with respect to a right and left image, that is, a descriptor related to a transmission mode exists in a descriptor following a syntax of program_info_length. The descriptors associated with the left and right video individual ESs are present in the descriptors following ES_info_length syntax. Referring to FIG. 4, the composite information related descriptor for the right and left images is defined as service_compatible_stereoscopic_video_descriptor (). Information related to the frame packing arrangement is described in MPEG2_video_3d-frame_packing_arrangement_descriptor () defined by the frame compatible method. However, the position of the MPEG2_video_3d_frame_frame_packing_arrangement_descriptor () can be specified at the descriptor position under the ES_info_length, not at the current position. In the case of the frame compatibility mode, since it is one video PID, the PID and the descriptor exist together. Left and Right images The descriptors associated with individual ESs are defined by stereoscopic_stream_descriptor (). However, in FIG. 4, it is noted that the positions of these descriptors are directly indicated in the syntax, but actually they are selectively included as in the previous descriptors.

FIG. 4 shows a descriptor associated with the left and right video ES after constructing a composite information related descriptor for the left and right video with respect to a specific program number. However, the present invention is not limited thereto. That is, as described above, the position of the MPEG2_video_3d_frame_frame_packing_arrangement_descriptor () may be varied, and the position of the descriptor in FIG. 4 may vary depending on the situation.

Table 1 below illustrates the strip types shown in FIG.

Value Description Ox00 ITU-T / ISO / IEC Reserved Ox01 ISO / IEC 11172-2 Video Ox02 ITU-T Rec. H.262 / ISO / IEC 13818-2 Video or ISO / IEC 11172-2 constrained parameter video stream Ox03 ISO / IEC 11172-3 Vudio Ox04 ISO / IEC 13818-3 Vudio ... ... Ox0A ISO / IEC 13818-6 TVPE ... ... Ox22 ITU-T Rec. h.262 / ISO / IEC 13818-2 Video with stersoscopic count coded using frame packing araangement ... ... Ox80-OxFF User Private

FIG. 5 illustrates a service_compatible_stereoscopic_video_descriptor according to an embodiment of the present invention. Hereinafter, the service_compatible_stereoscopic_video_descriptor according to an embodiment of the present invention will be described in detail with reference to FIG.

As described above, the service_compatible_stereoscopic_video_descriptor is a composite information related descriptor for left and right images, including resolution of left and right images, restriction of sub-image viewing, alignment of GOP structure, and whether ES level multiplexing method is used. In particular, FIG. 5A shows an example in which a PID is not used, and FIG. 5B shows an example in which a PID is used.

Hereinafter, an example in which the PID is not used will be described first with reference to FIG. 5A.

When Resolution_Conversion_flag is 1, it means that the syntax of Primary_Conversion_Type and Secondary_Conversion_Type exists. If 0, it means that the resolution of the left and right images is the same.

Primary_Conversion_Type is the content of division of the main image relative to the original image as shown in Table 2 below. However, the values and contents of Table 2 are exemplified and may be changed, reduced or defined as necessary.

value 0 One 2 3 meaning No resizing Horizontal split Split vertically Horizontal and vertical split in two

Secondary_Conversion_Type is the partition contents of the sub-image compared with the original image.

Allowance_of_Secondary_View_Presentation_flag = 1 means that the sub-image can be output independently to the screen as a 2D service. The Primary View is always allowed to output the 2D images independently, while the Secondary View can be prohibited or allowed to be output in 2D depending on the application.

If the Alignment_of_GOP_Structure_flag is 1, it means that the GOP structure of the right and left images is coincident. If not, signaling that additional processing for synchronization at presentation time is required according to the GOP structure. Of course, synchronization between left and right images is basically implemented by PTS, but signaling to the receiver will help to do necessary processing in advance. For example, the total delay of the left and right images is adjusted to a larger delay.

If ES_level_composition_flag is 1, it indicates that the ES level multiplexing scheme is used, and when it is 0, it means that the TS level multiplexing scheme is used.

Hereinafter, an example of using the PID using FIG. 5B will be described. However, only syntax other than the syntax explained with reference to FIG. 5A will be further described.

The Primary_PID_flag is a flag that exists only in the case of the TS level multiplexing scheme. If the flag is 1, the Primary_PID syntax is present. Otherwise, the stereoscopic_stream_descriptor () exists to confirm the PID of the main image.

The Primary_PID may specify the PID of the main video and determine the main video among the PIDs included in the PMT.

Right_Is_Primary_flag is a flag that exists only in the case of the TS level multiplexing method. If 1, the main image is a right image, otherwise, the left image is a main image.

By notifying whether the main video and the left video are present in the service_compatible_stereoscopic_video_descriptor, the stereoscopic_stream_descriptor does not exist and it is possible to discriminate whether the main video or the left video is a single descriptor. A method of notifying the Left_PID by a similar method, and a method of designating the Right_Is_Primary_flag, and the like, all of which are within the scope of the present invention.

In the case of using the Primary_PID and the Right_Is_Primary_flag, the stereoscopic_stream_descriptor exists to determine whether the main image and the right image are present for each image.

6 illustrates a stereoscopic stream descriptor according to an embodiment of the present invention. As described above, the stereoscopic_stream_descriptor is an information related descriptor related to the left and right video ES, and plays a role of indicating whether the current ES is the main view in the stereoscopic image.

Describe each ES for TS-level composition mode, and describe one ES for ES-level composition mode. Therefore, this descriptor considers both of these.

If Primary_flag is set to '1', it means that the current ES is the primary view, and when the main video is reproduced only, the main video must be reproduced.

Left_flag is set to 1, which means that the current ES is a bit stream of the left image.

When the Frist_Primary_flag is set to 1, when two image bit streams are interleaved in an arbitrary unit at the ES-level, they signal that the first part is a bit stream corresponding to the main image.

When First_Left_flag is set to 1, when two image bit streams are interleaved in an arbitrary unit at the ES-level, the first signal indicates that the first part is a bit stream corresponding to the left image.

It is possible to indicate whether the main video or the left video is displayed as needed or not, whether the sub video or the right video is displayed, and the like.

FIG. 7 shows an MPEG2_video_3d_frame_frame_packing_arrangement_descriptor.

Information related to the frame packing arrangement may be MPEG2_video_3d_frame_frame_packing_arrangement_descriptor () defined in the frame compatibility mode, and the semantics may be the same as that defined in the frame compatibility mode.

FIG. 8 is a flowchart illustrating a process of performing multiplexing in a service compatibility mode according to an embodiment of the present invention. Hereinafter, a process of multiplexing in the service compatibility mode according to an embodiment of the present invention will be described with reference to FIG.

In step S800, the PMT length is confirmed by section_length.

In step S802, syntax including program_number is read.

In step S804, the length of the descriptor is identified by program_info_length.

In step S806, it is checked whether all program information descriptors have been read. If all have been read, the process moves to step S820 via A, and if not, moves to step S808 and reads one descriptor associated with the program info.

In step S810, it is checked whether the service_compatible_stereoscopic_video_decryptor is set. If it is not the service_compatible_stereoscopic_video_decryptor, the process proceeds to step S812. Otherwise, the process proceeds to step S806.

In step S812, syntax information including ES_level_composition_flag is read to analyze synthesis information related to the left and right images.

In step S814, it is determined whether ES_level_compatible_flag is set. If ES_level_compatible_flag is set, the flow advances to step S816. Otherwise, the flow advances to step S818.

The step S816 activates the ES level multiplexing structure mode, and the step S818 activates the TS level multiplexing structure mode.

In step S820, it is determined whether all PMTs have been read. If all has been read, the process moves to step S842, and if not, the process moves to step S822. In operation S822, stream_type and elementary_PID are read.

In step S824, the descriptor length is checked by ES_info_length.

In step S826, it is checked whether all ES information descriptors have been read. If all have been read, the process moves to step S820, and if not all, the process moves to step S828.

In step S828, one descriptor associated with the ES info is read and the flow moves to step S830.

In step S830, it is checked whether the descriptor is a stereoscopic_stream_descriptor. If the descriptor is a stereoscopic_stream_descriptor, the process proceeds to step S834. If the descriptor is not a stereoscopic_stream_descriptor, the process proceeds to step S838.

In step S834, the primary_flag and the left_flag are read. In step S836, whether the video data corresponding to the current element_PID is the main video or the left video is determined.

In step S838, First_Primary_flag and First_Left_flag are read. In step S842, it is determined whether the video data located at the head of the data corresponding to the current element_PID corresponds to the main image or the left image.

In step S842, the CRC_32 is read and a data error is verified.

FIG. 9 is a flowchart illustrating a process of separating a bit string of an ES level multiplexing scheme. Hereinafter, a description will be made of a process of performing bit stream separation of an ES level multiplexing scheme in a service compatibility mode according to an embodiment of the present invention with reference to FIG. It will be understood that the following procedure assumes that the mixing of bit strings is performed in left and right order. It will be understood by those skilled in the art that the bit string may be mixed in the right and left order.

Step S900 parses the PMT.

In step S901, the service_compatible_stereoscopic_video_descriptor () in the PMT is parsed.

In step S902, ES_level_composition_flag is checked to determine whether the ES level multiplexing scheme is used.

In step S903, the MVC_bitstream_assembling_flag is checked to check whether the bit stream multiplexing scheme of the bitstream is multiplexed at the ES level conforms to the MVC bitstream assembling scheme (defined in stereo_high_profile or multiview_high_profile).

Step S904 parses the stereosopic_stream_descriptor () in the PMT.

In step S905, the First_Primary_flag is checked.

In step S906, First_Left_flag is checked.

Step S907 detects one AU from the received mixed bit stream.

In step S908, whether the data at the head of the data is left-shifted is checked from the First_Left_flag confirmed in step S906.

In step S909, it is determined whether the AU detected in step S907 is the odd-numbered AU. The odd-numbered AU plane moves to step S910, and the even-numbered AU plane moves to step S911.

In steps S910 and S911, the AU is separated into a left image or a right image bit stream using the information determined in step S909.

In step S912, it is determined whether all the AUs have been read. If all the AUs have been read, the process proceeds to step S913. Otherwise, the process proceeds to step S907.

In step S913, whether the data at the head of the data is the left image is checked from the First_Primary_flag confirmed in step S906. If First_Primary_flag is 1, the process proceeds to step S914. If the First_Primary_flag is 0, the process proceeds to step S915.

In steps S914 and S915, it is determined which of the bit strings is the main picture, using the primary information determined in step S913.

The step S916 transfers the separated bit stream to the decoder side.

FIG. 10 is a diagram illustrating a bit string separation method according to the MVC Bitstream Extraction method corresponding to S907 to S912 of FIG. 9, it is assembled in one AU unit, and since it is known whether the first AU is the main image or the left image, the NAL header is parsed and the view_id , it is possible to separate the bit streams of the left and right images as shown in FIG. 10 without checking anchor_pic_flag.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention .

In particular, in the drawings of the present invention, description has been made on 3D stereoscopic broadcasting which is currently under test broadcast and broadcasting standards. However, other complex broadcasts such as UHD TV broadcast and multi view broadcast are different only in the number of images, Can be performed. Accordingly, the present invention is not limited to the stereoscopic 3D broadcasting, but it can be applied to both the UHD TV broadcasting and the multi-view broadcasting.

Figure 2: Frame Compatibility Mode Figure 3: Service Compatibility Mode

Claims (6)

A method for processing stereoscopic 3D data in a digital broadcast receiver,
The method comprising: receiving a transport stream (TS) including a PAT (Program Association Table);
Parsing a PAT of a specific PID from the received TS;
Obtaining a PMT (Program Map Table) using the PMT PID in the parsed PAT;
Processing a PMT comprising at least two fields and at least two descriptors,
Wherein a first field in the PMT identifies a PID of the TS, a second field in the PMT identifies a stream type of the TS,
Wherein the first descriptor in the PMT identifies a type of service provided and the service type corresponds to any one of a 2D service, a frame compatible stereoscopic 3D service, or a service compatible stereoscopic 3D service,
The second descriptor in the PMT provides information related to a service compatible stereoscopic 3D service transmitting a left view and a right view in separate video streams,
The second descriptor in the PMT includes:
First information identifying whether the video stream is a primary video stream or an additional view video stream,
Second information defining a coded resolution of the base image, and
And third information identifying that the additional video stream can be used for a 2D video service,
The second information included in the second descriptor in the PMT,
And identifying whether the coded resolution of the additional image corresponds to 3/4, 2/3 or 1/2 of the coded resolution of the base image. delete delete delete delete The method according to claim 1,
Wherein the first descriptor included in the PMT is defined at a program level and the second descriptor included in the PMT is defined at an ES level.

Images