KR19990060127A - Method and apparatus for transmitting and receiving stereoscopic images in digital broadcasting - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting and receiving stereoscopic images in digital broadcasting. In the related art, in the case of analog broadcasting, the transmission order of images is alternately arranged in order. In case of digital broadcasting, additional information for video information, audio information, program guide, etc. is complicatedly multiplexed, and left and right images are arranged in disorder. Therefore, there is a problem in that it is impossible to display the video signal separately at the receiving side. In addition to the PID information indicating whether the multiplexed digital signal is video information, audio information, or additional information, a PID for transmitting a left and right video signal is added and transmitted, and the receiving side transmits a PID for the left and right video added to the video information. By separating the information and displaying the separated left and right images alternately, the TV showing only past two-dimensional images shows more realistic three-dimensional images.

Description

Method and apparatus for transmitting and receiving stereoscopic images in digital broadcasting

The present invention relates to a method and apparatus for transmitting / receiving stereoscopic images in digital broadcasting such that a TV can watch a more realistic three-dimensional image on a television showing only two-dimensional images of the past, in particular, a video in a multiplexed digital signal. In addition to the PID information indicating whether the information is audio information or additional information, a PID for transmitting the left and right video signals is added and transmitted, and the receiving side separates the left and right video information added to the video information, and then The present invention relates to a method and apparatus for transmitting and receiving stereoscopic images in digital broadcasting to display stereoscopic images by alternately displaying left and right separated images.

One of the basic concepts of implementing stereoscopic images in the related art is to make an image as a pair, that is, a stereoscopic image pair in a transmission system.

The stereoscopic image pair is composed of two subfields, one subfield of which constitutes the right side of the stereoscopic image pair, and the other subfield of which constitutes the left side of the stereoscopic image pair.

The receiving side separates the images corresponding to the left and right sides of the stereoscopic images received in pairs, so that the viewers can experience the stereoscopic images by displaying different images in different viewers' eyes.

There are several ways to make the separated image visible to the viewer's eyes.

One method is to display the left and right sides of the stereoscopic image in the viewer's left eye and to display the right side of the stereoscopic image in the viewer's right eye when the separated left and right images are displayed. In this case, it is necessary to wear glasses so that the viewer can watch a stereoscopic image.

The glasses used here are equipped with shutters so that the left and right images are shuttered at different times so that only one eye of the wearer can be seen.

There is also a method that does not need to wear glasses, in which case you can not use the display device currently used, and use a special display device designed for viewing stereoscopic images.

There are Parallex Barrier method, Lenticular method and Holography method to make such a special display device.

However, in the prior art as described above, in the case of analog broadcasting, the transmission order of images is alternately orderly, so if only the first and end of the frame of the image signals are received at the receiving side, the left and right images are unreasonable. In case of digital broadcasting, additional information for video information, audio information, program guide, etc. is complexly multiplexed with each other, and the left and right images are arranged in an orderly manner, and the receiving side separates the video signal. There is a problem that is impossible to display.

Accordingly, an object of the present invention to solve the conventional problems as described above is to provide a method and apparatus for transmitting and receiving stereoscopic images in digital broadcasting to enable stereoscopic image viewing in digital broadcasting.

Another object of the present invention is to provide a method and apparatus for transmitting / receiving stereoscopic images in digital broadcasting, by adding a PID for distinguishing left and right images to a transport stream representing video information when transmitting multiplexed transport streams. have.

Another object of the present invention is to transmit and receive a stereoscopic image in digital broadcasting by using the PID added to the video information in the transport stream to be accurately separated and played back to view the stereoscopic image and In providing a device.

It is still another object of the present invention to provide a method and apparatus for transmitting and receiving stereoscopic images in digital broadcasting, in which the left and right images are separated and reproduced from video information, so that they can be simultaneously restored using two decoders. In providing.

1 is a signal diagram illustrating a process of transmitting an input image in each frame unit in the case of a conventional analog broadcast.

2 is an explanatory diagram showing a PID assignment method in the current digital broadcasting.

3 is an explanatory diagram showing a PID grant method in the digital broadcasting proposed in the present invention.

4 is a block diagram of a stereoscopic image transmission device in the present invention digital broadcasting.

5 is a multiplexing process diagram illustrating a digital broadcast signal multiplexed through a multiplexing unit in FIG. 4.

6 is a block diagram of a stereoscopic image receiving apparatus in the present invention digital broadcasting.

FIG. 7 is a detailed block diagram of an external device in FIG. 6.

8 is a flowchart of a method of transmitting a stereoscopic image in the digital broadcasting of the present invention.

9 is a flowchart illustrating a method of receiving a stereoscopic image in the digital broadcasting of the present invention.

10 is a table showing contents of a PMT (Program Map Table) in which various kinds of information are set in the related art.

Fig. 11 is a table showing the contents of PMT in which various kinds of information of the present invention are set.

12 is a block diagram of another embodiment of the present invention.

13 is a flowchart illustrating an operation of another embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

41: left video signal generator 42: right video signal generator

43: Left video signal compression unit 44: Right video signal compression unit

45: voice compression unit 46: multiplexer

47: modulator 61: controller

62: image signal recovery unit 63: left image storage unit

64: right image storage unit 65: display device

66: timing signal transmitter 67: external device

According to an aspect of the present invention, an image acquisition step of acquiring a left and right image for a stereoscopic image through an independent imaging tube, and an image compression step of compressing the obtained left and right images into a form suitable for digital transmission, respectively, PMT generation step of setting the PID information in the PMT (Program Map Table) in four types for transmission of the compressed image, and assigning PID for distinguishing the left and right images to the PMT set above, It is characterized by transmitting a stereoscopic image in a transmission signal multiplexing step of converting the image, audio and additional information to be combined and transmitted according to a specific form.

In addition, the present invention converts the optical signal obtained from the left side of the object to obtain an electrical image signal, the left image signal generator for generating the obtained left image signal, and the left to compress the signal generated above to MPEG-2 A video signal compression unit, a right image signal generator for converting an optical signal obtained from the right side of the subject to obtain an electrical image signal, and generating the obtained right image signal, and compressing the generated signal to MPEG-2. A right video signal compression unit, an audio compression unit for compressing an input audio signal, and a PID to a left and right video compressed by the PID, and a left and right video and audio to which the PID is applied and an external input A multiplexer for converting information into a form suitable for transmission, and a modulator for modulating the multiplexed signal according to transmission and transmitting the modulated transport stream. Sex and is characterized in that an implementation of the three-dimensional image transmission apparatus.

The present invention provides a control unit for outputting a display timing signal for synchronous control to separate left and right video, audio, and additional information from a received transport stream and output the same as a stereoscopic image, and a compressed form separated from the control unit. A video signal restoring unit for restoring left and right video signals to original left and right video signals, a left and right video signal storage unit for temporarily storing left and right video signals restored by the video signal restoring unit, and the controller A timing signal transmitter for transmitting a shutter control signal for shuttering an external device according to the display timing signal outputted from the controller, a display device for alternately displaying left and right images of the restored video signal, and a shutter from the timing signal transmitter Receiving a control signal and shuttering in synchronization with the information displayed on the display Characterized in that a three-dimensional image receiving device consisting of an external device to have a three-dimensional effect.

In addition, the present invention and the left and right image separation step for separating the left and right image signal included in the received signal by the PID information, and the left and right image signal decoding step of decoding each of the separated compressed video signal to restore the original signal; And receiving a stereoscopic image by transmitting a left and right image timing signal for transmitting the EOF signal obtained by the decoding to an external device and displaying a left and right image signal on the display in accordance with the EOF signal. do.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

8 is an operation process diagram of the stereoscopic image transmission method in the digital TV of the present invention, as shown in the image acquisition step (S11) for acquiring the left and right images for the stereoscopic image through an independent image pickup tube, and the image acquisition. Image compression step S12 for respectively compressing the left and right images obtained in step S11 into a form suitable for digital transmission, and PMT in four types of PID information for transmission of the image compressed in the image compression step S12. The PMT generation step (S13) set in the (Program Map Table) and the PMT set in the PMT generation step (S13) are given PIDs for distinguishing the left and right images, and the left and right images, audio and additional information to which the PID has been assigned Is composed of a transmission signal multiplexing step (S15) for converting to be combined and transmitted according to a specific form.

In the digital broadcasting apparatus of the present invention for performing the method comprising the above steps, as shown in Fig. 4, the optical signal obtained from the left side of the object is converted into an electrical video signal, and the obtained A left video signal generator 41 for generating a left video signal, a left video signal compressor 43 for compressing a signal generated by the left video signal generator 41 with MPEG-2, and a right side of the subject The obtained optical signal is converted into an electrical image signal, and the right image signal generator 42 generating the obtained right image signal and the signal generated by the right image signal generator 42 are converted into MPEG-2. PID is assigned to the right video signal compression unit 44 to compress, the audio compression unit 45 to compress the input audio signal, and the left and right images compressed by the compression units 43 to 45. Left and right video and audio with PID And a multiplexer 46 for converting additional information input from the outside into a form suitable for transmission, and a modulator for modulating a signal multiplexed by the multiplexer 46 to transmit and transmitting the modulated transport stream. It consists of 47.

9 is a flowchart illustrating a method of receiving a stereoscopic image in the digital broadcasting according to the present invention. As shown in FIG. 9, the left and right image separation step (S22) for separating the left and right image signals included in the received signals by PID information is shown. And the left and right image signal decoding steps S24 and S25 for decoding and restoring the compressed video signals separated in the left and right image separation step S22, respectively, and the EOF signals obtained in the left and right image signal decoding steps S24 and S25. Left and right video timing signal transmission step (S26, S27) for transmitting to the external device, and left and right video signal display step (S30, S31) for displaying the decoded video signal on the display.

According to the configuration of the stereoscopic image receiver in the digital broadcasting of the present invention comprising the above steps, in order to separate the left and right images, audio, and additional information from the received transport stream and output them as stereoscopic images. A control unit 61 for outputting a display timing signal for synchronous control and a video signal restoring unit 62 for restoring the compressed left and right images separated by the control unit 61 into original left and right image signals. And the left and right video signal storage units 63 and 64 for temporarily storing the left and right video signals restored by the video signal restorer 62, and the display timing signals output from the controller 61. A timing signal transmitter 66 for transmitting a shutter control signal for shuttering an external device, a display device 65 for alternately displaying left and right images of the restored video signal; An external device 67 is configured to receive a shutter control signal from the timing signal transmitter 66 and to shutter in synchronization with information displayed on a display.

Referring to the operation and effect of the present invention configured as described in detail as follows.

In digital broadcasting, a transport stream (TS) to be transmitted includes three types of video information (Video PES: Packetized Elementary Stream), audio information (Audio PES), and program specific information (PSI) for a program. Information is complexly multiplexed with each other.

In this way, it is not possible to distinguish what information is received from a receiver that receives the multiplexed transport stream.

Therefore, as shown in FIG. 2, the transport side transmits a transport stream by assigning a PID for distinguishing each piece of information from each other.

Then, if the receiver analyzes the PID, it is possible to know whether the corresponding transport stream TS is video information, audio information or additional information (PSI).

Here, the PID is a tag for distinguishing each piece of information transmitted by multiplexing in the current digital broadcast. For example, if the PID is analyzed, the corresponding transport stream (TS) is video information, audio information, or additional information ( PSI) to see if it is.

However, in order to view a stereoscopic video, each video transport stream (TS) to be transmitted must be notified that it is video information, and at the same time, whether the current video information is related to the image on the left side or the image on the right side. do.

Therefore, in the present invention, as shown in FIG. 3, the PID information can separate only video, audio, and PSI information, and at the same time, it indicates whether the current video information is a right image or a left image.

Accordingly, a transmission apparatus for transmitting a PID indicating left and right images among video information during transmission of a transport stream (TS) will be described with reference to FIG. 4.

When the left and right images for stereoscopic images are input through independent image capturing tubes, the left and right image signal generators 41 and 42 convert the optical signals for the left and right images into electrical image signals, thereby compressing the left and right image signals. Output to (43) (44), respectively.

Then, the left video signal compressor 43 compresses the left video signal into MPEG-2 that conforms to the digital standard and provides it to the multiplexer 46, and the right video signal compressor 44 transmits the right video signal to MPEG-2. Compressed to provide to the multiplexer 46.

At this time, the voice compression unit 45 also compresses the input voice signal and provides it to the multiplexer 46.

Accordingly, the multiplexer 46 includes left and right video signals provided by the left and right video signal compressors 43 and 44, voice provided by the audio compressor 45, and additional information (PSI) provided from the outside. PID information (type) for classifying the data is written in PMT (Program Map Table) in four types as shown in FIG.

Thereafter, a PID code value capable of distinguishing left and right images is added to the PMT table.

In this way, the information added with the PID code value is multiplexed.

Referring to the multiplexing method, video information (Video PES: Packetized Elementary Stream) as shown in (a) in FIG. 5, audio information (Audio PES) as shown in (b), program guide as shown in (c), and the like. PSI (Program Specific Information) for the display is multiplexed as shown in FIG.

When the multiplexed information is output from the multiplexer 46 to the modulator 47, the modulator 47 modulates and outputs the data for transmission, and the output data is a header as shown in FIG. Send it on the (header).

Referring to the information generated in the PMT, it can be seen that in the conventional case illustrated in FIG. 10, video information is not divided into left and right, while in the present invention illustrated in FIG. 11, left and right images are divided.

The transmission process described so far will be described once again with reference to FIG. 8.

First, when the left image signal and the right image signal of the optical signal are input through different image capturing tubes, left and right images obtained by converting the optical signal of the image into electrical signals are obtained.

In order to transmit the obtained left and right images, MPEG-2 is compressed.

And the voice signal is compressed.

Thereafter, four types of PID information such as left and right video and audio compressed in step S12, and additional information input from the outside are set in the PMT table (S13), and are defined in the generated PMT table. A PID code value for distinguishing left and right images is added (S14).

Then, the compressed left and right video, audio, and additional information are multiplexed in a form suitable for transmission.

When the multiplexed transport stream is transmitted in the same manner as described above, the receiver receives the input from the receiving side and displays the stereoscopic image, which is described below with reference to FIG. 6.

When the transmitting side transmits the multiplexed transport stream (TS), the control unit 61 received through the antenna demultiplexes the transport stream using a PID.

Accordingly, the demultiplexed transport stream TS is separated into a left video signal, a right video signal, audio information, and additional information.

Then, the control unit 61 provides the left image and the right image which are separated and compressed from the separated information to the image signal reconstruction unit 62.

Accordingly, the video signal restoration unit 62 decodes the left and right images simultaneously by using the first decoder 621 and the second decoder 622 to restore the original left and right video signals, and restores the original left and right video signals. Among the signals, the left image signal is output to the left image storage unit 63, and the right image signal is output to the right image storage unit 64, respectively.

Then, the left and right image storage units 63 and 64 temporarily store the left and right image signals.

In this case, the controller 61 outputs a display timing signal to the timing signal transmitter 66. The display timing signal is informed by an end-of-frame (EOF) code indicating a change of a frame.

Then, when the left and right image signals are output to the display device 65 by the EOF code, the display device 65 is connected to the left and right image storage parts 63 and 64. The stored left and right images are alternately displayed one by one, 30 frames per second.

At the same time, the timing signal transmitter 66 transmits a specific code value to the external device 67 using an infrared signal in synchronization with the moment displayed on the display device 65 using an end-of-frame code.

Here, when the external device 67 is a pair of glasses with a shutter, the timing signal transmitter 66 sends a signal to the glasses every time the left and right images intersect, and the glasses need to alternately shutter the left and right lenses. Teach the moment

In the case of glasses as described above, the external device 67 is configured as shown in FIG. 7 and the operation thereof is as follows.

The timing signal receiver 671 receives an infrared signal of a specific code transmitted from the timing signal transmitter 66 and outputs the infrared signal to the controller 672.

Accordingly, when the controller 672 recognizes the signal output from the timing signal receiver 671 and outputs a control signal for driving the shutter to the shutter driver 673 according to the recognition result, the shutter driver 673. In response to the control signal, power is transmitted to the left shutter 674 or the right shutter 675 for opening the viewer's eyes at regular time intervals.

Accordingly, the left shutter 674 and the right shutter 675 are alternately driven to allow a viewer to enjoy a stereoscopic image.

In addition, as another embodiment of the present invention, there is a method of using a separate display device developed for an input image display. The display device is related to a conventionally developed device.

In addition, as shown in FIG. 12, a configuration diagram of another embodiment is omitted, and the same parts as those described in the above embodiment are omitted, and the apparatus for displaying an image signal received by the above method is a display for a conventional stereoscopic image. By using a device to watch a three-dimensional image by using a transmission and reception method of digital broadcasting, except for the external device and the timing transmission and reception device includes a special display device that allows to watch a three-dimensional image using the left and right video signal Characterized in that made.

In the method of another embodiment as described above, except for transmitting the timing signal in the stereoscopic image display method as shown in FIG. 13, the separated left and right image signals of the other embodiment may be applied to a specially manufactured display device to watch a stereoscopic image. It is characterized by making it possible.

The operation of the receiver will be described based on FIG. 13. Before the digital signal is transmitted from the transmitter, PID values of the left and right images are found.

Then, when the multiplexed digital signal is transmitted, only the information having the PID of the left and right images is selected from the received signals (S32).

In this way, it is checked whether the selected PID is the left screen or the right screen (S33). If the left screen is transmitted, the left image is transmitted to the first decoder 621 of the video signal restoration unit 62 (S34). The right image is transmitted to the second decoder 622 of the image signal recovery unit 62 (S35).

After transmitting the left image or the right image as described above, the timing signal transmitter 66 transmits the left image or the right image display timing signal and also transmits the first and second decoders 621 and 622 (S36). S37).

Then, the left image or the right image is displayed according to the display timing signal. (S38, S39)

In the same manner as described above, the viewer can watch a stereoscopic image for digital broadcasting.

Therefore, in the present invention, when a PID for distinguishing a left and right video signal is added and transmitted in addition to PID information indicating whether video information, audio information, or additional information is multiplexed in a multiplexed digital signal, a receiver may add a left side to video information. By separating the information on the right image, and displaying the separated left and right images alternately, there is an effect of showing a more realistic three-dimensional image in the TV showing only the past two-dimensional image.

Claims (9)

An image acquisition step of acquiring the left and right images for a stereoscopic image through an independent imager, an image compression step of compressing the obtained left and right images into a form suitable for digital transmission, and PID information for transmission of the compressed image The PMT generation step of setting the PMT (Program Map Table) in four forms, and assigning PIDs for distinguishing left and right images to the PMTs set above, the left and right images to which the PIDs are assigned, and audio and additional information are specified. 3. The stereoscopic image transmission method of digital broadcasting, comprising: a multiplexing step of transmitting a signal to be combined and transmitted so as to be combined. A left image signal generator for converting an optical signal obtained from the left side of the object to obtain an electrical image signal, and a left image signal generator for generating the obtained left image signal, and a left image signal compressor for compressing the generated signal to MPEG-2. And a right image signal generator for converting the optical signal obtained from the right side of the subject to obtain an electrical image signal, and generating the obtained right image signal, and a right image signal for compressing the generated signal to MPEG-2. A compression unit, an audio compression unit compressing to transmit the input audio signal, a PID is assigned to the compressed left and right images, and the left and right images and audio provided with the PID and additional information input from the outside are transmitted to the transmission unit. And a multiplexer for converting into a suitable form, and a modulator for modulating the multiplexed signal according to transmission and transmitting the modulated transport stream. Three-dimensional image transmission apparatus in a digital broadcasting according to. A control unit for outputting a display timing signal for synchronous control to separate left and right images, audio, and additional information from the received transport stream and output the stereoscopic image, and a compressed left and right image separated from the control unit. A video signal restoring unit for restoring original left and right video signals, a left and right video signal storage unit for temporarily storing left and right video signals restored by the video signal restoring unit, and outputted from the controller A timing signal transmitter for transmitting a shutter control signal for shuttering an external device according to the display timing signal, a display device for alternately displaying left and right images of the restored video signal, and a shutter control signal from the timing signal transmitter. 3D effect by shuttering in synchronization with information received and displayed on the display Stereoscopic image receiving apparatus for digital broadcasting, characterized in that consisting of an external device to have. The apparatus of claim 3, wherein the image signal reconstructing unit comprises two decoders for decoding the left image and the right image, respectively. 4. The stereoscopic image receiver according to claim 3, wherein the display timing signal uses an end-of-frame (EOF) code for notifying change of a frame. The apparatus of claim 3, wherein the external device comprises: a timing signal receiver for receiving a signal transmitted from a timing signal transmitter, a controller for outputting a control signal for control by the control signal received above, and the control signal; The shutter driver is configured to transfer power to drive the shutter, and the shutter unit alternately opens the viewer's eyes at predetermined time intervals according to the transmitted signal, so that the left and right shutters can be alternately driven according to timing information to watch a stereoscopic image. An apparatus for receiving a stereoscopic image in digital broadcasting, characterized in that the. A left and right image separation step of separating left and right image signals included in the received signals by PID information, a left and right image signal decoding step of decoding and restoring the separated compressed video signals, respectively, and an EOF signal obtained from the decoding And a left and right image timing signal transmission step of transmitting the left and right image timing signals to a device and displaying the decoded image signal on a display. A control unit for separating left and right images and audio additional information from the received transport stream and outputting the same to the stereoscopic image display device to output the stereoscopic images, and the left and right image signals of the compressed left and right images separated from the control unit. And a left and right video signal storage unit for temporarily storing the left and right video signals restored by the video signal restorer, respectively. Displaying the left and right image separation step for separating the left and right video signal included in the received signal by the PID information, the left and right video signal decoding step of decoding and restoring the separated compressed video signal respectively, and displays the video signal obtained by the decoding And a left and right video signal display step for displaying on a three-dimensional video receiving method for digital broadcasting.