KR20080031887A - Video data recording apparatus and information storage medium on which the video data is recoreded thereby - Google Patents

Abstract

A video data recording apparatus and an information storage medium recording video data are provided to enable a recording unit to decode extracted video data, encode the decoded video data in a different scheme, and record the encoded video data in an optical disk, thereby reproducing the video data and hyper-text data properly even when the video data is re-encoded and recorded in the different scheme. A filter unit(1) extracts video data from a received bitstream. A recording unit(3) decodes the video data and encodes the decoded video data in a different encoding method, records the encoded video data, and generates and records video conversion information about the video data. The video conversion information includes the resolution and aspect ratio of the video data. A control unit(2) creates image conversion information which is to be referred in order to decode image data in a state same as the original state, and transmits the created image conversion information to the recording unit.

Description

Video data recording apparatus and information storage medium on which the video data is recoreded hence}

The present invention relates to an image data recording apparatus and an information storage medium having recorded thereon image data.

In the digital broadcast signal, video data and hypertext data are multiplexed. Video data and hypertext data are transmitted in an MPEG transport stream. The user can receive the MPEG transport stream, record it on an information storage medium, and play it back when desired.

17 is a reference diagram for explaining a problem of the prior art.

Referring to FIG. 17, an MPEG transport stream is decoded and synthesized, respectively, of video data (a) and hypertext data (b), and reproduced as shown in (c). However, if the video data (a) is decoded in the MPEG transport stream and then re-encoded video data (a ') is recorded in another manner, the video data (a') and the hypertext data (b) are properly synthesized and displayed during playback. It can't be. Here, the hypertext data is text or graphic data separately formed from the MPEG video element stream constituting the MPEG transport stream. For example, the hypertext data includes subtitle (subtitle) data composed of markup text, plain text, or graphics. Point to the same information.

It is an object of the present invention to provide a recording apparatus and an information storage medium capable of properly reproducing image data and hypertext data even if the image data is re-encoded and recorded in another manner.

According to an aspect of the present invention, an object of the present invention is an extractor for extracting image data from a received bitstream, and decoding the image data and encoding and decoding the decoded image data in a manner different from that of the original. And a recording unit generating and recording image conversion information of the image data, wherein the image conversion information includes a resolution and an aspect ratio of the image data.

In a preferred embodiment, the recording unit is characterized in that for decoding the decoded image data to have a different resolution than the resolution of the image data. The recording unit may extract the resolution of the image data. The recording unit may extract the aspect ratio of the image data. The image conversion information may be included in a PMT packet.

According to another aspect of the present invention includes image data generated by encoding decoded image data in a manner different from that of the original, and image conversion information for the image data, wherein the image conversion information includes a resolution and an aspect ratio of the image data. It can provide a recording medium comprising a.

As described above, according to the present invention, even if the image data is re-encoded and recorded in another manner, the image data and the hypertext data can be reproduced properly.

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

1 is a block diagram of a recording apparatus according to the present invention.

Referring to FIG. 1, the recording apparatus includes a filter unit 1, a control unit 2, and a recording unit 3.

The filter unit 1 extracts image data from the input bitstream. The recording section 3 decodes the extracted image data and encodes the decoded image data in a manner different from that of the original, and records it on the optical disc 9 as an information storage medium. The control unit 2 generates and transfers the image conversion information to be referred to in order to decode the image data in the same state as the original.

When the bitstream is, for example, a digital broadcast stream transmitted from a digital TV broadcasting station, the filter unit 1 filters an information packet including program information data for reproduction / recording.

 Further, the data packet constituting the selected program is filtered.

A digital broadcast stream is a sequence of data packets and information packets constituting a broadcast program. The information packet may be classified into two types, one of which is a first information packet indicating an identifier of packets in which identifiers of data packets constituting at least one broadcast program are recorded. It is a 2nd information packet which informs the identifier of the data packet which comprises. That is, the identifier of the second information packet is recorded in the first information packet, and the identifier of the data packet constituting the program is recorded in the second information packet. If multiple channels are supported, the second information packet exists as many as the number of corresponding channels. However, the number of packets physically constituting each information packet may be plural. Furthermore, the information packet may not be divided into two but may be integrated into one or separated into three or more.

When the digital broadcast stream is an MPEG transport stream, an information packet including program information data for reproduction / recording is a PAT (Program Association Table) packet and a PMT (Program Map Table) packet. The PAT packet is a first information packet and the PMT packet is a second information packet. The data packet includes a video packet, an audio packet, and / or a hypertext data packet.

FIG. 2 is an embodiment of FIG. 1.

Referring to FIG. 2, a recording apparatus receives an MPEG transport stream and then re-encodes and records it in another manner, and includes a demultiplexer 50, a video decoder 51, a video encoder 53, a filter 55, and a PSI. (Program Specific Information) A generator 56 and a multiplexer 57 are provided. Furthermore, the audio decoder 52 and the audio encoder 54 may be further provided.

The demultiplexer 50 receives the MPEG transport stream and separates it into video data (and audio data), hypertext data, and program information data. More specifically, the MPEG transport stream is divided into a video packetized element stream (PES), an audio packetized element stream (PES), hypertext data, and program information data, so that the video decoder 51, the audio decoder 52, and the filter are respectively. Inputted to 55 is. Video decoder 51 decodes the video PES and video encoder 53 encodes the decoded video PES in a different manner. Other types of encoding include compression, reduction and extension of data size. Audio decoder 52 decodes the audio PES and audio encoder 54 encodes the decoded audio PES in a different manner. However, when the audio decoder 52 and the audio encoder 54 are not provided, the audio PES is directly input to the multiplexer 57.

The filter 55 filters the hypertext data and the necessary program information data. More specifically, the filter 55 filters necessary packets among PAT packets and PMT packets periodically included in the MPEG transport stream. Program information data for recording / reproducing / searching for a program composed of an MPEG transport stream is recorded in the PAT packet and the PMT packet. PSI generator 56 generates Program Specific Information (PSI) that describes the program. The data structure of the PSI is defined in the MPEG system standard. In addition, the PSI generator 56 extracts the vertical / horizontal resolution and the aspect ratio of the video data output from the video decoder 51, inserts the information into the PMT packet as image conversion information, and transmits the same to the multiplexer 57. The vertical / horizontal resolution and aspect ratio of the video data is recorded in the header of the video data. The multiplexer 57 multiplexes and outputs the PMT packet including the input video data, audio data, hypertext data, and image conversion information. The multiplexed data stream is recorded in the program area of the optical disc 200.

Alternatively, the multiplexer 57 may pass through the PMT packet including the image conversion information without multiplexing so that it is recorded only in the program information data area of the optical disc 200. The PMT packet may be recorded as a PMT table in which PMT configuration information is recorded.

On the other hand, hypertext data is text or graphic data composed separately from the MPEG video element stream constituting the MPEG transport stream. For example, hypertext data includes subtitle (subtitle) data composed of markup text, plain text, or graphics. Point to the same information.

3 and 4 are reference diagrams for explaining the MPEG transport stream.

Referring to FIG. 3, video packets 31, 33, 34, and 37 and audio packets 32, 33, 35, and 36 are multiplexed in the inputted MPEG transport stream 300. When the MPEG transport stream is received, the video packets 31, 33, 34, 37 and the audio packets 32, 33, 35, 36 constituting the MPEG transport stream are separated and recombined into the audio stream 301 and the video stream 302, respectively. .

4, packet identifiers are assigned to MPEG transport packets 41, 42, 43, 44, 45, 46, and 47 constituting the MPEG transport stream 400, respectively. Similarly, when the MPEG transport stream 400 is received, each packet in decoding is treated as one file in which packets having the same identifier are connected to each other. That is, as shown in FIG. 4, packets with packet identifier 1 are combined to form one stream 401 and packets with packet identifier 2 are combined to form another stream 402. Meanwhile, the PAT packet may be identified by assigning a specific packet identifier. In FIG. 4, the packet having the packet identifier 0 is a PAT packet. In the PAT packet, identifiers of the same number of PMT packets as the number of supported channels are recorded. For simplicity, one PAT packet is shown, but as described above, the number of PAT packets may be changed.

5 is a reference diagram for explaining an information storage medium on which an MPEG broadcast program is recorded by the recording apparatus according to the present invention.

5, a data recording area of an information storage medium is divided into a navigation data area in which navigation data is recorded and a program area in which programs # 1, # 2, ..., #n are recorded. The program consists of a bitstream in which video data (and audio data) and hypertext data are multiplexed. The programs # 1, # 2, ..., #n respectively indicate logical units of content recorded on the information storage medium. The navigation data refers to information necessary for recording, playing back or editing a program, and general information described in the program.

6A and 6B are reference diagrams for explaining a data structure of image conversion information recorded according to embodiments of the present invention.

Referring to FIG. 6A, a PMT table in which PMT configuration information is recorded is recorded in a navigation data area. Referring to FIG. 6B, a PMT packet including PMT configuration information is inserted and recorded in a bitstream in a program area.

7 is a reference diagram for explaining a data structure of navigation data according to an embodiment of the present invention.

Referring to FIG. 7, the navigation data includes a volume manager table. The management table contains management information for a plurality of programs recorded on the entire information storage medium. The management table includes the general information volume gerneral information (VOL_GI) about the information storage medium, a pointer table PG_SRPT (Program search pointer table) indicating the location of program information, and a program information table PG_IT # (Program Information Table #) for each program. It includes.

The VOL_GI includes the number of program numbers PG_Ns (Program Numbers) recorded in the information storage medium. PG_SRPT informs the offset value PG_IT_SRP # (PG_IT Search Pointer #) of the program information table for the corresponding program from the start position of the management table. Therefore, the offset value PG_IT_SRP # exists as many as the number of corresponding programs.

The program information table PG_IT contains information necessary for playing the program. When the fields constituting the program information table PG_IT are sequentially described, PAT_SA indicates the offset value of the corresponding PAT table from the start position of PG_IT as the start address of the PAT table, and PMT_SA corresponds to the start position of PG_IT as the start address of the PMT table. Informs the offset value of the PMT table. TMAP_SA is the start address of TMAP and informs the offset value of the corresponding PAT table from the start position of PG_IT. The PAT table has the same structure as the Program Association Table structure defined in the MPEG-2 standard. However, the PAT table may be modified and recorded in a structure that may refer only to PMT information recorded in the PMT packet for the corresponding program. The PMT table records PMT configuration information included in the PMT packet. Furthermore, image conversion information according to the present invention is inserted. TMAP is a table that maps time to location (address). The structure may be the same as, for example, the structure of a DVD-VR or a DVD-Streamer.

The image conversion information includes resolution and aspect ratio. The resolution refers to the resolution of image data included in the bitstream in its original state. Aspect ratio refers to the aspect ratio of a pixel. If necessary, it can mean the aspect ratio of the display screen.

8 is a reference diagram for explaining a data structure of image conversion information according to an embodiment of the present invention.

Referring to FIG. 8, image conversion information is inserted into the aforementioned PMT table or PMT packet. In the PMT packet, a video element descriptor according to the MPEG standard is defined. The video element descriptor is for recording information or the like which indicates whether the video data is video data according to any of MPEG-1, MPEG-2, and MPEG-4. The video element descriptor is added with a video transform descriptor which is image transform information according to the present invention. The video conversion descriptor informs the resolution and aspect ratio of the video data before it is re-encoded. The following is an example of a video conversion descriptor included in a video element descriptor.

video _ transform _ descriptor () { descriptor _ tag descriptor _ length horizontal _ size vertical _ size aspect _ ratio _ information }

Here, "_ descriptor tag" indicates an identifier of the video transform descriptor. " D escript or_ length " indicates the data size of the video conversion descriptor. "Horizontal_size" is the resolution in the horizontal direction, and "vertical size _" refers to the vertical resolution. "Aspect ratio _ _ information" represents the aspect ratio.

The PMT packet according to the MPEG standard is defined as follows.

TS_program_map_section () {table_id section_syntax_indicator. . . For (i = 0; i <N; i ++) {descriptor ()} For (i = 0; i <N1; i ++) {stream_type reserved elementary_PID reserved ES_info_length for (i = 0; I <N2; I ++) { descriptor ( ); }} CRC_32}

Here, "stream_type == 0x02" means video data. That is, when "stream_type == 0x02", " descriptor () " is a video element descriptor describing video data. The video conversion descriptor according to the present invention is inserted into the video element descriptor as follows.

TS_program_map_section () {table_id section_syntax_indicator. . . For (i = 0; i <N; i ++) {descriptor ()} For (i = 0; i <N1; i ++) {stream_type reserved elementary_PID reserved ES_info_length for (i = 0; I <N2; I ++) { descriptor ( ) . . video _ transform _ descriptor () { descriptor _ tag desriptor _ length horizontal _ size vertical _ size aspect _ ratio _ information } . . ] }} CRC_32}

Referring to the recording method according to the present invention based on the above configuration as follows.

9 is a flowchart for explaining a recording method according to an embodiment of the present invention.

Referring to FIG. 9, the recording apparatus generates video conversion information on the received MPEG transport stream and inserts it into the PMT table as PMT configuration information, and records it in the navigation data area separately from the area where the program is recorded (step 901). . Here, the recording device may record as a PMT packet instead of a PMT table. While recording with the PMT table has the advantage of reducing the recording space, there is a hassle of recombining PAT packets and PMT packets and transmitting them to the MPEG decoder during playback. The opposite is true when recording with a PAT packet and a PMT packet. On the other hand, the recording apparatus extracts the MPEG transport packet constituting the program requested to be recorded from the user, encodes the video data in another manner, and records it in the program area (step 902). Whether to record PAT packets and PMT packets together is optional. Steps 901 and 902 may be performed first with a time difference. Or simultaneously by time division techniques.

10 is a flowchart for explaining a recording method according to another embodiment of the present invention.

Referring to FIG. 10, the recording apparatus changes and records the resolution of video data when receiving and recording an MPEG transport stream multiplexed with video data and hypertext data. That is, the video decoder 51 decodes the video data (step 1001), and the video encoder 53 re-encodes the decoded video data to have the changed resolution (step 1002). On the other hand, the filter 55 provides the demultiplexed hypertext data from the MPEG transport stream to the multiplexer 57 (step 1003). The PSI generator 56 generates image conversion information (video conversion descriptor) and inserts it into the video element descriptor of the PMT packet (step 1004). The multiplexer 57 multiplexes the encoded video data (and audio data) and the hypertext data (step 1105). The recording device records the PMT configuration information in the navigation data area (step 1006). On the other hand, the multiplexed bitstream is recorded in the program area (step 1007).

11 is a block diagram of a playback apparatus according to the present invention.

Referring to FIG. 11, the playback apparatus includes a decoder 5, an image conversion information extracting unit 6, and a reading unit 4. The read unit 4 reads bitstream data and image conversion information from the optical disc 300. The image conversion information extraction unit 6 extracts the image conversion information from the reader 64 and provides the same to the decoder 5. The decoder 5 decodes the bitstream data in the same state as the original with reference to the provided image conversion information.

12 is an embodiment of FIG. 11.

Referring to FIG. 12, the playback apparatus includes a reader 4, a demultiplexer 60, a video decoder 61, an audio decoder 62, a filter 65, a PSI parser 66, a hypertext data decoder 63, And a blender 64. In particular, in the present embodiment, the PSI parser 66 is provided as the image conversion information extractor 6.

The reader 4 reads and outputs a bitstream from the optical disk 500 which is an information storage medium. In the bitstream, video data (and audio data) and hypertext data are multiplexed. In particular, in the bitstream, image conversion information is multiplexed into PMT packets. The bitstream is externally output as a digital signal or input to the demultiplexer 60. The demultiplexer 60 demultiplexes the bitstream and outputs video data, audio data, hypertext data, and program information data, respectively. The filter 65 filters the necessary data of the hypertext data and the program information data. The PSI parser 66 parses the image conversion information from the program information data and delivers the image conversion information to the video decoder 61. The video decoder 61 decodes the image data according to the original resolution and aspect ratio (image conversion information) provided from the PSI parser 66 and then provides the image data to the blender 64. The audio decoder 62 decodes the audio data and provides it to the sound output device. Hypertext data that has passed through filter 65 is decoded in hypertext data decoder 63 and provided to blender 64. The blender 64 blends the image data and the hypertext data and outputs the blended image.

13 is another embodiment of FIG. 11.

Referring to FIG. 13, the playback apparatus includes a reader 4, an image conversion information extractor 6, a remultiplexer 67, a demultiplexer 60, a video decoder 61, an audio decoder 62, and a filter 65. , PSI parser 66, hypertext data decoder 63, and blender 64. In particular, in the present embodiment, the PSI parser 66 is included in the decoder 5, and the image conversion information extractor 6 exists separately from the PSI parser 66. Furthermore, unlike that of FIG. 12, the decoder 5 further includes a remultiplexer 67.

The reader 4 reads the bitstream from the optical disk 400 which is an information storage medium and outputs the bitstream to the image conversion information extractor 6 and / or the demultiplexer 60. In the bitstream, video data (and audio data) and hypertext data are multiplexed. Further, the reader 4 reads out the image conversion information recorded as the PMT configuration information from the navigation data area and outputs it to the image conversion information extraction section 6.

The image conversion information extractor 6 extracts the image conversion information and provides the image conversion information to the remultiplexer 67 and / or the video decoder 61. The remultiplexer 67 multiplexes the bitstream and the image conversion information and outputs the digital signal. The demultiplexer 60 demultiplexes the bitstream and outputs video data, audio data, hypertext data, and program information data, respectively. The video decoder 61 decodes the image data in accordance with the original resolution and aspect ratio (image conversion information) provided from the image conversion information extraction unit 6 and then provides the image data to the blender 64. The audio decoder 62 decodes the audio data and provides it to the sound output device. Hypertext data that has passed through filter 65 is decoded in hypertext data decoder 63 and provided to blender 64. The blender 64 blends the image data and the hypertext data and outputs the blended image. On the other hand, program information data is passed by the filter 65 and then parsed by the PSI parser 66.

Referring to the reproduction method according to the present invention based on the above configuration as follows.

14 is a flowchart for explaining an embodiment of a playback method.

Referring to FIG. 14, the image conversion information extraction unit 6 of the playback apparatus transmits PMT configuration information corresponding to a program to be played back to the decoder 5 (step 1401). The PMT configuration information includes image conversion information. The read unit 4 also reads the bit stream constituting the program (step 1402) and delivers it to the decoder 5 (step 1403). The decoder 5 multiplexes image conversion information into a bitstream and outputs the digital signal.

15 is a flowchart for explaining another embodiment of the playback method.

Referring to FIG. 15, the playback apparatus reads out an MPEG transport stream in which video conversion information is multiplexed together as PMT configuration information from the optical disc 500 through the reader 4 and outputs it to the outside (step 1501). On the other hand, the reproduction apparatus reads out and reproduces the MPEG transport stream including the image data recorded with the changed resolution. That is, the demultiplexer 60 demultiplexes the MPEG transport stream recorded on the optical disc 500 into video data, audio data, hypertext data, and program information data (step 1502). The filter 65 filters necessary hypertext data and program information data (step 1503). PSI parser 66 parses the video conversion descriptor from filter 65 and provides it to video decoder 61 (step 1504). The video decoder 61 decodes the video data to have the original resolution by referring to the video conversion descriptor (step 1505). The audio decoder 62 decodes the audio data and outputs the audio data to the sound output device (speaker) (step 1506). The hypertext data decoder 63 decodes the hypertext data (step 1507). The blender 64 blends the decoded video data and hypertext data and outputs the blended video to a display device (not shown) (step 1508). The video data and the hypertext data are thus displayed in the same state as the original.

16 is a flowchart for explaining another embodiment of the playback method.

Referring to FIG. 16, the reader 4 reads an MPEG transport stream from a program area of the optical disc 400 and outputs the MPEG transport stream to the remultiplexer 67 and the demultiplexer 60 (step 1601). The reader 4 reads the PMT configuration information from the navigation data area of the optical disc 400, and the image conversion information extracting unit 6 generates a PMT packet based on the PMT configuration information and provides it to the remultiplexer 67 ( Step 1602). The remultiplexer 67 multiplexes the MPEG transmission stream and the PMT packet and outputs the digital signal externally (step 1603). The demultiplexer 60 demultiplexes the MPEG transport stream into video data, audio data, hypertext data, and program information data (step 1604). The filter 65 filters necessary hypertext data and program information data (step 1605). The image conversion information extraction unit 6 provides the image conversion information (video conversion descriptor) to the video decoder 61 (step 1606). The video decoder 61 decodes the video data to have the original resolution by referring to the image conversion information (video conversion descriptor) (step 1607). The audio decoder 62 decodes the audio data and outputs the audio data to the sound output device (speaker) (step 1608). The hypertext data decoder 63 decodes the hypertext data (step 1609). The blender 64 blends the decoded video data and the hypertext data and outputs the blended video to a display device (not shown) (step 1610). The video data and the hypertext data are thus displayed in the same state as the original.

The recording method and the reproduction method can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. The program is also stored in a computer readable media, and read and executed by a computer to implement a method of recording and playing back the MPEG broadcast program. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

1 is a block diagram of a recording apparatus according to an embodiment of the present invention;

2 is a block diagram of a recording apparatus according to another embodiment of the present invention;

3 and 4 are reference diagrams for explaining an MPEG transport stream;

5 is a reference diagram for explaining a data structure of an information storage medium on which an MPEG transport stream is recorded by a recording apparatus according to the present invention;

6A and 6B are reference diagrams for explaining a data structure of image conversion information recorded according to embodiments of the present invention;

7 is a reference diagram for explaining a data structure of navigation data according to an embodiment of the present invention;

8 is a reference diagram for explaining a data structure of image conversion information according to an embodiment of the present invention;

9 is a flowchart for explaining a recording method according to an embodiment of the present invention;

10 is a flowchart for explaining a recording method according to another embodiment of the present invention;

11 is a block diagram of a playback apparatus according to an embodiment of the present invention;

12 is a block diagram of a playback apparatus according to another embodiment of the present invention;

13 is a block diagram of a playback apparatus according to another embodiment of the present invention;

14 is a flowchart for explaining a playback method according to an embodiment of the present invention;

15 is a flowchart for explaining a playback method according to another embodiment of the present invention;

16 is a flowchart for explaining a playback method according to another embodiment of the present invention;

17 is a reference diagram for explaining a problem of the prior art.

Claims (8)

A recording apparatus for recording data on an information storage medium, An extraction unit for extracting image data from the received bitstream; And A recording unit which decodes the image data, encodes and decodes the decoded image data in a manner different from that of the original data, and generates and records image conversion information for the image data, wherein the image conversion information includes a resolution of the image data. And an aspect ratio. The method of claim 1, And the recording unit encodes the decoded image data to have a resolution different from that of the image data. The method of claim 2, And the recording unit extracts the resolution of the image data. The method of claim 3, And the recording unit extracts the aspect ratio of the image data. According to claim 1, And the image conversion information is included in a PMT packet. Image data generated by encoding decoded image data in a manner different from that of the original; And Include image conversion information for the image data, And the image conversion information comprises a resolution and an aspect ratio of the image data. 7. The recording medium of claim 6, wherein the decoded image data is encoded and recorded to have a resolution different from that of the resolution. The method of claim 6, And the image conversion information is included in a PMT packet.

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