KR100697972B1 - Digital broadcast transmitter and method for stereoscopic broadcast service - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an apparatus and method for digital broadcast transmission for stereoscopic broadcasting service.

2. The technical problem to be solved by the invention

The present invention defines a descriptor for configuration information of a 3D broadcast service to be compatible with a 2D broadcast system, thereby compatible with an existing 2D digital broadcast system and capable of 3D broadcast service. The purpose is to provide the method.

3. Summary of Solution to Invention

The present invention, image acquisition means for obtaining a 2D (Dimenssion) image and a 3D image from the outside; Audio signal obtaining means for obtaining an audio signal from the outside; 2D image encoding means for encoding the 2D image obtained by the image obtaining means using an MPEG-2 encoding algorithm; 3D image encoding means for encoding the 3D image information obtained by the image obtaining means, wherein the 3D image information includes an image, a disparity map, and depth map information of different views; Audio signal encoding means for encoding the audio signal obtained by the audio signal obtaining means by using an audio encoding algorithm of the existing 2D digital broadcasting system; PSI generation means for generating a PSI by defining a descriptor including 3D broadcast service configuration information; PSIP / SI generating means for generating a PSIP / SI by defining a descriptor including 3D broadcast service configuration information; And multiplexing means for multiplexing the encoded 2D image, 3D image information and audio signal, and the generated PSI and PSIP / SI.

4. Important uses of the invention

The present invention is used in a 2D / 3D broadcast system.

3D broadcast, PSI, PSIP, descriptor, PMT, VCT

Description

Apparatus and method for 3D broadcasting service for digital broadcasting service {Apparatus and Method for 3D Broadcasting Service}             

1 is a block diagram of a stereoscopic image transmission device in a conventional digital broadcasting;

2 is a block diagram of an embodiment of a digital broadcast transmission apparatus for a stereoscopic broadcast service according to the present invention;

3 is a diagram illustrating a PMT section in which a descriptor for configuration information of a 3D broadcast service is defined;

4 is a diagram illustrating an example of defining a descriptor for configuration information of a 3D broadcast service according to the present invention in the PMT section of FIG. 3;

5 is a diagram illustrating a service location descriptor in which a value for 3D image information is defined according to an embodiment of the present invention;

6 is a diagram illustrating an embodiment of a stream_type configuration of FIG. 5;

7 is a flowchart illustrating a digital broadcast transmission method for a stereoscopic broadcast service according to the present invention.

* Explanation of symbols for the main parts of the drawings

210: 3D image acquisition unit 220: 2D image encoder

230: 3D image information encoding unit 240: audio acquisition unit

250: audio encoder 260: PSI generator

270: PSIP / SI generator 280: multiplexer

290: modulator

The present invention relates to a digital broadcast transmitting apparatus and method for a stereoscopic broadcasting service, and more particularly, to a digital broadcasting transmitting apparatus and method which can be defined and applied to a 3D broadcasting service while being compatible with an existing 2D digital broadcasting system. It is about.

Although there have been many discussions about the 3D broadcasting service in a conceptual or implementation manner, it is not commercialized. This is because the 3D broadcast service is not actually applied to a broadcast system operating in the field.

1 is a block diagram of a stereoscopic image transmission device in a conventional digital broadcasting.

As shown in FIG. 1, the stereoscopic image transmission apparatus in the conventional digital broadcasting includes the left-video signal generator 110 for generating a left video signal and the signal generated by the left-video signal generator 110. Left image signal compression unit 120 for compressing to 2, the right image signal generator 130 for generating the right image signal, the right image for compressing the signal generated by the right image signal generator 130 to MPEG-2 A signal compressor 140, an audio signal compressor 150 for compressing an input voice signal, a multiplexer for multiplexing the left and right images compressed by the compressors 120, 130, and 150 and the input PSI ( 160 and a modulator 170 for modulating and transmitting the multiplexed signal.

However, the conventional stereoscopic image transmission apparatus as shown in FIG. 1 has the following problems.

Firstly, it is very abstract except for sending left and right images together. That is, a scheme for distinguishing a left image from a right image is not presented, and a new definition in the PSI for maintaining compatibility with an existing 2D digital broadcasting system is not presented.

Next, all currently serviced 2D digital broadcasts are based on the MPEG-2 system, but the specifications are different such as ATSC (Advanced Television Systems Committee), DVB-S, OpenCable. That is, broadcast protocols for expressing configuration information and program guide information of broadcast programs such as PSIP and SI are used differently. Accordingly, in order for the 3D digital broadcast transmitter of FIG. 1 to be compatible with the existing 2D digital broadcast system, all of the different broadcast protocols of the existing 2D digital broadcast system must be satisfied. It is not presented.

 The present invention has been proposed to solve the above problems, and by defining a descriptor for configuration information of the 3D broadcast service to be compatible with the 2D broadcast system, it is compatible with the existing 2D digital broadcast system and enables 3D broadcast service. An object of the present invention is to provide an apparatus and method for transmitting digital broadcast for a stereoscopic broadcast service.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to an aspect of the present invention, there is provided a digital stereoscopic broadcast transmission apparatus compatible with an existing 2D digital broadcasting system, comprising: image acquisition means for acquiring a 2D (Dimenssion) image and a 3D image from the outside; Audio signal obtaining means for obtaining an audio signal from the outside; 2D image encoding means for encoding the 2D image obtained by the image obtaining means using an MPEG-2 encoding algorithm; 3D image encoding means for encoding the 3D image information obtained by the image obtaining means, wherein the 3D image information includes an image, a disparity map, and depth map information of different views; Audio signal encoding means for encoding the audio signal obtained by the audio signal obtaining means by using an audio encoding algorithm of the existing 2D digital broadcasting system; PSI generation means for generating a PSI by defining a descriptor including 3D broadcast service configuration information; PSIP / SI generating means for generating a PSIP / SI by defining a descriptor including 3D broadcast service configuration information; And multiplexing means for multiplexing the encoded 2D image, 3D image information and audio signal, and the generated PSI and PSIP / SI.

In addition, the present invention for achieving the above object, In the digital stereoscopic broadcast transmission method, Signal acquisition step of acquiring 2D video, 3D video and audio signals; An encoding step of encoding the obtained 2D image, 3D image and audio signal; A descriptor definition step of defining descriptors for the 2D image, 3D image, and audio signal information to generate PSI and PSIP; And a multiplexing step of multiplexing and transmitting the generated PSI and PSIP and the encoded 2D image, 3D image, and audio signal, wherein the encoding step encodes the 2D image by using MPEG-2 encoding algorithm, A signal is encoded by using an audio encoding algorithm of an existing 2D digital broadcasting system, and the 3D image information includes an image, a disparity map, and a depth map of different views. A digital broadcast transmission method is provided.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an embodiment of a digital broadcast transmission apparatus for a stereoscopic broadcast service according to the present invention.

As shown in FIG. 2, the apparatus for transmitting digital broadcasting for a stereoscopic broadcasting service according to the present invention includes a 3D image acquisition unit 210, a 2D image encoding unit 220, a 3D image information encoding unit 230, and an audio acquisition unit. 240, an audio encoder 250, a PSI generator 260, a PSIP / SI generator 270, a multiplexer 280, and a modulator 290.

The 3D image acquisition unit 210 acquires 2D image and 3D image information from the outside. Here, the 3D image information is an image, a disparity map, a depth map, etc. at different viewpoints.

The 2D image encoder 220 encodes the 2D image acquired through the 3D image acquirer 210 into MPEG-2. This is to ensure the compatibility of the 3D digital broadcast transmission apparatus according to the present invention and the existing 2D digital broadcast system.

The 3D image information encoder 230 encodes 3D image information acquired through the 3D image acquirer 210, that is, images of different viewpoints, a disparity map, a depth map, and the like. At this time, the 3D image information encoder 230 uses an arbitrary encoding algorithm according to the service efficiency.

The audio acquirer 240 obtains an audio signal from the outside, and the audio encoder 250 encodes the audio signal obtained through the audio acquirer 240. At this time, the audio encoder 250 encodes according to the audio encoding algorithm of the 2D digital broadcasting system in which the 3D digital broadcasting transmitter according to the present invention is used.

That is, ATSC and Opencable encode an audio signal according to an AC-3 audio encoding algorithm, and DVB (Digital Video Broadcasting) -2 encodes an audio signal according to an MPEG audio encoding algorithm.

The PSI generator 260 defines a descriptor that includes 3D broadcast service configuration information to generate PSI (Program Specific Information), and the PSIP / SI generator 270 includes a descriptor that includes 3D broadcast service configuration information. Define a (descriptor) to generate PSIP (Program Service Information Protocol) / SI (Service Information).

The multiplexer 280 multiplexes the encoded 2D image, 3D image information and audio, PSI and PSIP / SI generated by the PSI generator 260 and the PSIP / SI generator 270, and modulates the PSI and PSIP / SI. 290 modulates and transmits the multiplexed signal.

Hereinafter, the PSI and PSIP / SI generated by the PSI generator 260 and the PSIP / SI generator 270 will be described.

In the standard of the existing 2D digital broadcasting system, the broadcasting protocol information indicating the broadcasting configuration is composed of PSI and terrestrial PSIP for ATSC, PSI and SI for DVB-S, and PSI and SI for OpenCable. It is composed of PSIP for cable. At this time, PSI is optional for PSSC and PSIP is required for broadcast protocol information, PSI and SI are required for DVB-S, PSI is required for OpenCable, and PSIP is optional.

Accordingly, a descriptor for configuration information of a 3D broadcast service is defined in both the PSI and the PSIP so that the 3D digital broadcast transmission apparatus according to the present invention can be utilized in the aforementioned 2D digital broadcast system.

First, referring to the PSI, the PSI is composed of a PAT (Program Association Table), a PMT (Program Map Table), a CAT (Conditional Access Table), and the descriptor for configuration information of the 3D broadcast service should be defined in the PMT.

3 is a diagram illustrating a PMT section in which descriptors for configuration information of a 3D broadcast service are defined.

The descriptor for the configuration information of the 3D broadcast service according to the present invention is defined in a for statement including stream_type, reserved, elementary_PID, etc. in the PMT section shown in FIG.

stream_type is not a data type defined in MPEG-2, so it is set to user private.

In addition, the elementary_PID may be arbitrarily set and used by the user, and defines a value for 3D image information for the 3D broadcast service in the set stream_type. At this time, the 3D image information basically includes images of different viewpoints, a disparity map, and a depth map, and the images of different viewpoints include a full screen, a vertical half screen, and a horizontal half screen. .

FIG. 4 is a diagram for describing a descriptor for configuration information of a 3D broadcast service according to the present invention in the PMT section of FIG. 3.

As shown in FIG. 4, the disparity map is defined as 00 xxxxxx, the depth map is 01 xxxxxx, the horizontal half image is 10 000001, the vertical half image is 10 000010, and the entire image is 10 000011.

Next, look at the PSIP, ATSC, OpenCable system is basically composed of MGT (Master Guide Table), STT (System Time Table), VCT (Virtual Channel Table), the descriptor for the configuration information of the 3D broadcast service Should be defined in In particular, the value of the 3D image information for the 3D broadcast service in the descriptor of the VCT should be defined as a service location descriptor.

FIG. 5 is a diagram illustrating a service location descriptor in which a value for 3D image information is defined according to the present invention.

A value for configuration information of a 3D broadcast service is defined in a for statement including stream_type, reserved, elementary_PID, etc. among the service location descriptor syntax shown in FIG. 5.

6 is a diagram illustrating an embodiment of the stream_type configuration of FIG. 5. The stream_type of FIG. 5 is matched with the definition in the PMT section of FIG. 3 with reference to the part defined in FIG. 6. At this time, values that can be used are 0xC0 to 0xFF in the user private section.

In addition, the descriptor to be defined is the same as FIG. 4, and the descriptor value must be the same for the PSI and the PSIP.

On the other hand, in the case of DVB-2, since the function of the PSI is essentially included, 3D image information can be parsed if defined only in the PSI as described above.

7 is a flowchart illustrating a digital broadcast transmission method for a stereoscopic broadcast service according to the present invention.

First, a 2D image, a 3D image, and an audio signal are obtained from an external device (710), and the obtained 2D image, 3D image, and an audio signal are encoded (720).

At this time, the 2D video is encoded by MPEG-2, the 3D video is encoded by an arbitrary encoding algorithm according to the service efficiency, and the audio signal is encoded by the audio encoding algorithm of the 2D digital broadcasting system to which the present invention is applied.

Thereafter, a descriptor for the 2D image, the 3D image, and the audio signal information is defined to generate a PSI and a PSIP (730). In this case, the 3D image information basically includes an image, a disparity map, and a depth map of different views, and the descriptor of the 3D image information may be a PMT section in the case of PSI, as shown in FIGS. 4 and 6. PSIP is defined in the service location descriptor of the VCT.

Next, the generated PSI and PSIP and the encoded 2D video, 3D video, and audio signal are multiplexed in a form suitable for transmission (740).

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in detail any more.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

As described above, the present invention has an effect of providing a realistic 3D video broadcasting service while being compatible with an existing 2D digital broadcasting system.

Claims (6)

In the digital stereoscopic broadcast transmission apparatus having compatibility with the existing 2D digital broadcasting system, Image acquisition means for acquiring a 2D (Dimenssion) image and a 3D image from the outside; Audio signal obtaining means for obtaining an audio signal from the outside; 2D image encoding means for encoding the 2D image obtained by the image obtaining means using an MPEG-2 encoding algorithm; 3D image encoding means for encoding the 3D image information obtained by the image obtaining means, wherein the 3D image information includes an image, a disparity map, and depth map information of different views; Audio signal encoding means for encoding the audio signal obtained by the audio signal obtaining means by using an audio encoding algorithm of the existing 2D digital broadcasting system; PSI generation means for generating a PSI by defining a descriptor including 3D broadcast service configuration information; PSIP / SI generating means for generating a PSIP / SI by defining a descriptor including 3D broadcast service configuration information; And Multiplexing means for multiplexing the encoded 2D image, 3D image information and audio signal, and the generated PSI and PSIP / SI Digital broadcast transmission device for a stereoscopic broadcast service comprising a. delete The method of claim 1, The PSI generating means, The configuration information of the 3D image is defined in the descriptor of the PMT section as shown in the following table. Digital broadcast transmission device for stereoscopic broadcast service. [table]

The method according to claim 1 or 3, The PSIP / SI generating means, Define the stream_type of the 3D video as one of user private intervals among the stream_type values defined in the service location descriptor of the VCT (Virtual Channel Table), To define the descriptor for the configuration information of the 3D image as shown in the following [Table] Digital broadcast transmission device for stereoscopic broadcast service. [table]

In the digital stereoscopic broadcast transmission method, A signal obtaining step of obtaining a 2D image, a 3D image, and an audio signal; An encoding step of encoding the obtained 2D image, 3D image and audio signal; A descriptor definition step of defining descriptors for the 2D image, 3D image, and audio signal information to generate PSI and PSIP; And A multiplexing step of multiplexing the generated PSI and PSIP and the encoded 2D video, 3D video and audio signals Including but not limited to: The encoding step Encoding the 2D image using an MPEG-2 encoding algorithm, encoding the audio signal using an audio encoding algorithm of an existing 2D digital broadcasting system, The 3D video information, Including images from different viewpoints, a Disparity Map, and a Depth Matp. Digital broadcast transmission method for stereoscopic broadcasting service. The method of claim 5, The descriptor definition step, When generating the PSI, the configuration information of the 3D image is defined in the descriptor of the PMT section as shown in [Table] below. When creating a PSIP, the stream_type of the 3D video is defined as one of user private intervals among stream_type values defined in a service location descriptor of a VCT (Virtual Channel Table). Table] A digital broadcast transmission method for a stereoscopic broadcast service characterized by defining a descriptor for the configuration information of the 3D video. [table]

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