KR100301011B1 - Data structure and recording and reproducing apparatus for still picture, and method thereof - Google Patents

Abstract

The present invention discloses a data structure and recording / reproducing apparatus for a still image, and a method thereof. The present invention defines and stores a plurality of still picture data in a recording / reproducing unit, stores additional information for accessing the recording / reproducing unit, and audio data added to the still picture is included in the recording / reproducing unit, Video data and audio data are stored in one minimum recording / reproducing unit. Audio data added to the still picture for after-recording of audio data is contained in the recording / reproducing unit, and the audio data is stored in a predetermined area within the recording / reproducing unit in a separate minimum recording / reproducing unit, thereby utilizing the minimum information data. Therefore, a large amount of still images and audio data added thereto can be recorded, displayed and edited in each still image unit, and corresponding to after-recording of the audio data.

Description

Data structure and recording and reproducing apparatus for still picture, and method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of recording and reproducing audio and / or video (A / V) data using a rewritable disc, and more particularly, to a data structure and a recording and reproducing apparatus for efficiently processing still and audio data added thereto. It is about a method.

1 is a diagram illustrating recording and reproducing A / V data on a digital versatile disc (DVD), in which a program chain (PGC), a program, a cell and actual A / V data are recorded to logically handle data. The relationship between VOBs (Video Objects) is shown.

The term is explained first. If a movie is divided into upper and lower parts and recorded, the entire movie becomes a PGC, and the upper and lower parts can be referred to as programs. In addition, in each program, random access may be divided into a plurality of small units in consideration of random access, and data corresponding to each cell is actually present in the VOB. In this case, each cell may be used as a basic unit of access during reproduction.

1 illustrates a relationship between a program chain information (PGCI) having connection information of various programs and a VOB in which actually compressed A / V data is recorded. One or more programs exist in one PGCI, and one program can be composed of a set of units of one or more cells. Each cell is a logical unit for recording / reproducing, and actual data is stored in a VOB. The PGCI only contains information about the program, such as the position of the actual data in the VOB and the recording / reproducing time information. In addition, the VOB is divided and recorded in units of VOBU (Video Object Unit), which is used as a unit of random access of the disc recording / reproducing apparatus. VOBS shown in FIG. 1 represents a VOB set.

In general, VOBU is based on one GOP (Group of Picture) for moving picture expert group video (MPEG) video, and audio is collected for video, and VOBU is formed by multiplexing A / V data by sector. .

The data structure as shown in FIG. 1 relates to a moving picture. When the data structure is applied as a data structure for still pictures, the order of display in each still picture unit is described, or the display order is changed by a separate editing device. In this case, the minimum display unit cell should represent one still image. In this case, since the information on the cell and the information on the VOB are added to each still picture, the amount of information increases.

In general, a recordable disk has a limit of the number of recordable times, since data may be in error when a predetermined number of times is recorded. In order to limit the number of times and quickly access the data, all information data is stored in the memory of the controller that controls the system. As described above, when the amount of information becomes large, as described above, it takes a long time to read all the information data, and there is a problem that all information cannot be stored in a memory of a certain size. Still pictures cannot be recorded.

In addition, considering the case of after-recording audio for still image, there is a problem that the structure as shown in Fig. 1 is not suitable because A / V data must be multiplexed by sector unit and recorded again.

In order to solve the above problems, it is an object of the present invention to provide a data structure for storing a large amount of still images with efficient information data on a rewritable disc.

Another object of the present invention is to provide a data structure suitable for after-recording audio data for still image on a rewritable disc.

It is still another object of the present invention to provide a recording / playback apparatus capable of displaying and editing each still image while recording a large amount of still images using efficient information data on a rewritable disc.

It is still another object of the present invention to provide a recording / playback method capable of displaying and editing each still picture while recording a large still picture using efficient information data on a rewritable disc.

In order to achieve the above object, the data structure according to the present invention is a data structure for a rewritable disc: additional information for defining and storing a plurality of still pictures as a recording / reproducing unit, and accessing the recording / reproducing unit. Characterized in that for storing.

In addition, the data structure of the present invention is characterized in that audio data added to a still image is contained in a recording / reproducing unit, and video data and audio data for the still image are stored in one minimum recording / reproducing unit.

In order to achieve the above another object, in the data structure of the present invention, the audio data added to the still picture is included in the recording / reproducing unit, and the audio data is stored in a predetermined area within the recording / reproducing unit in a separate minimum recording / reproducing unit. Characterized in that.

In order to achieve the above another object, the recording and reproducing apparatus according to the present invention is a recording and reproducing apparatus for recording and reproducing audio and / or video (A / V) data on a rewritable disc: a still image input during recording. AV codec that encodes data in minimum recording / reproducing unit to provide encoded data and coded size information for storing multiple still images in recording / reproducing unit on disc, and decodes still image data read from the disc during reproduction. And a system controller for recording additional information for accessing the recording / reproducing unit by using the encoded size information during recording, and controlling the still image data at a point desired by the user to be read using the additional information during playback. It is done.

In order to achieve the above another object, the recording and reproducing method according to the present invention is a method for recording and reproducing audio and / or video (A / V) data on a rewritable disc, comprising the following: A cell for accessing the VOB information and the VOB using the stored information after encoding and encoding the video object unit into a VOB (Video Object), storing the video size information in the VOBU, and after all recording operations Generating information and recording the information on a disc.

In addition, the recording and reproducing method according to the present invention further comprises the step of obtaining a start position for the VOB to be reproduced by the user using the cell information and reproducing the still image data of the desired position using the VOB information. do.

1 illustrates a relationship between a PGC, a program, a cell, and a VOB.

2 is a block diagram of a disc recording and reproducing apparatus according to the present invention.

3 is an example of a data structure for freezing according to the present invention.

FIG. 4 is a table showing details of cell information shown in FIG. 3.

FIG. 5 is a table showing details of VOB information accessed by the VOB_ID shown in FIG. 4.

FIG. 6 is a table showing details of the VOBU table illustrated in FIG. 5.

FIG. 7 is a table illustrating details of the reference map illustrated in FIG. 5.

8 is another example of a data structure for freezing according to the present invention.

9 is a table showing details of the VOB table shown in FIG. 8.

FIG. 10 is a table showing details of a video VOBU table shown in FIG. 9.

FIG. 11 is a table illustrating details of a video reference map illustrated in FIG. 9.

FIG. 12 is a table showing details of an audio VOBU table shown in FIG. 9.

FIG. 13 is a table illustrating details of an audio reference map illustrated in FIG. 9.

14 is an operation flowchart according to an embodiment of the still picture recording method according to the present invention.

15 is a flowchart illustrating an operation of a still picture reproducing method according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described a preferred structure of the data structure and recording and reproducing apparatus and method for a still image according to the present invention.

Fig. 2 is a block diagram of a recording / playback apparatus according to the present invention. The functions of the apparatus for recording and reproducing A / V data using a recordable and rewritable disc can be broadly divided into recording and playback.

In recording, the AV codec 110 compresses and encodes an externally input A / V signal by a predetermined compression scheme, and provides size information on the compressed data for each VOBU unit. The digital signal processor (DSP) 120 receives A / V data supplied from the AV codec 110, adds additional data for ECC (Error Correction Code) processing, and performs modulation or the like by a predetermined modulation scheme. A high frequency amplifier (denoted RF AMP: 130) converts electrical data supplied from the DSP 120 into an optical signal. The pickup unit 140 drives a disk, records an optical signal from the RF AMP 130 on the disk, and has an built-in actuator for focusing and tracking. The servo unit 150 receives information necessary for servo control from the RF AMP 130 and the system controller 160 to perform stable servo. The system controller 160 controls to record the A / V data on the disk while controlling the entire system, and defines a range of regions as cells for the recorded data to determine information about the cell and the position of the recorded data. Record the known VOB information.

At the time of reproduction, the pickup section 140 picks up the optical signal from the disk storing the data, and the data is extracted from the optical signal. The RF AMP 130 converts the optical signal into an electrical signal and extracts a servo signal and modulated data for performing the servo. The DSP 120 demodulates the modulated data supplied from the RF AMP 130 in response to the modulation scheme used for modulation, and performs ECC to correct an error and remove additional data. The servo unit 150 receives information necessary for servo control from the RF AMP 130 and the system controller 160 to perform stable servo. The AV codec 110 decodes the compressed A / V data supplied from the DSP 120 and outputs an A / V signal. The system controller 160 performs a user interface such as processing a key input of a user, and uses data such as cell information recorded on a disk and VOB information having various size information about the recorded data. Control the entire system to play it.

3 is a data structure illustrating a relationship between a cell and a VOB for freezing according to the present invention, wherein a cell, which is a logical unit for display, may correspond to the entire VOB, and the data of the VOB in which data is recorded for efficient information management. Some can be displayed.

Each still picture is recorded independently of each other in the VOB. When audio is added to the still picture, the still pictures are recorded in the order of the audio following the still picture. That is, if there is no audio in "V" representing one still picture, one still picture "V" constitutes one VOBU, and if there is audio data in the still picture, "V" and "A" represent one VOBU. Will be constructed.

FIG. 4 is a table showing details of cell information having information on the cell shown in FIG. 3, VOB_ID having the actual VOB ID (identification) indicated by the cell, and C_S_VOBU_ID indicating the starting position at the time of reproduction of the cell. And C_E_VOBU_ID indicating the end position of the cell during playback.

FIG. 5 is a table showing the details of the VOB information having the information on the VOB accessed by the VOB_ID shown in FIG. 4, the VOB_ID indicating the VOB ID, the VOB_ADR having the start position information of the VOB, and all of the VOBs. It consists of VOBU_Ns having number information of VOBU, RMAP_Ns having number information of reference map, VOBU table having detailed information of VOBU unit, reference map and the like.

FIG. 6 is a VOBU table having detailed information in units of all VOBUs of the VOB illustrated in FIG. 5, VOBU_V_SZ which is a size occupied by video data for each VOBU, and a size occupied by audio data for each VOBU. It consists of VOBU_A_SZ and VOBU_A_PBTM, which is a playback time of audio data. The size information may be represented by the number of packs or the number of bytes. When there is no audio data, the audio size information VOBU_A_SZ and the play time information VOBU_A_PBTM are both displayed as "0", indicating that there is no audio data.

In order to find a specific position in the middle of the cell using this information, the desired position may be found by adding the start position information of the VOB shown in FIG. 5 and the size information occupied by each VOBU. However, in the case where the number of VOBUs is large, this summation operation takes a long time, and thus a value calculated in advance in a separate area may be recorded.

Fig. 7 shows detailed information of a reference map having such a function, and is composed of RMAP_INDEX indicating the index of the reference map and VOBU_ADR indicating the position of the VOBU as size information from the beginning of the VOB to the VOBU indicated by the RMAP_INDEX. RMAP_INDEX is generated for each fixed number of VOBUs. For example, in FIG. 3, RMAP_INDEX is configured for every three VOBUs.

In this logical structure, when the user wants to play from the middle of a specific cell, for example, the fifth still picture VOBU, the process of searching for a location where the desired data is located will be described as follows.

First, the ID of the VOB corresponding to this cell is obtained from the cell information, the VOB information corresponding to the VOB_ID is interpreted, and the starting position of the VOB is known, and the address value corresponding to the first index of the reference map and the fourth from the VOBU table are obtained. By adding the corresponding size information value, size information from the first to fifth VOBUs of the VOB is obtained, and the position from which the VOB start position and the size of the desired VOBU are to be played back is obtained to determine the position to be played back.

The data structure according to the embodiment of the present invention described above is a data structure suitable for a method of recording audio data immediately after recording a still picture when there is audio data in the still picture, which is to be separately recorded after recording all still pictures. When recording is to be done by the audio after-recording method, a data structure as shown in FIG. 8 should be used.

In FIG. 8, video data corresponding to a still image is collected and arranged in a VOB corresponding to a specific cell as VOBU, and each audio data to be recorded after is recorded as VOBU and arranged in the rear part of the VOB.

Here, even when recording still images after recording audio, video data is collected and arranged in the video data area at the front. In this case, the reference map and the VOBU table exist separately for audio data and video data.

FIG. 9 is a table showing details of VOB information having information on the VOB shown in FIG. 8, VOB_ID representing the VOB ID, VOB_ADR having the start position information of the VOB, and size information of all video VOBUs in the VOB. All_V_SZ, VOBU_V_Ns having number information of all video VOBUs in VOB, VOBU_A_Ns having number information of all audio VOBUs in VOB, RMAP_V_Ns having number of video reference maps, and RMAP_A_Ns having number of audio reference maps And a video VOBU table (V_VOBU_TABLE), a video reference map (V_RMAP), an audio VOBU table (A_VOBU_TABLE), and an audio reference map (A_RMAP) having detailed information in units of VOBU.

FIG. 10 is a video VOBU table shown in FIG. 9 and includes VOBU_V_SZ indicating the size of the video VOBU, VOBU_A_ID having ID information of the audio VOBU, and the like.

FIG. 11 is a table showing details of the reference map for video shown in FIG. 9, wherein V_RMAP_INDEX indicating the index of the reference map given for each fixed number of video VOBUs and size information from the beginning of the VOB to the VOBU indicated by V_RMAP_INDEX are shown in FIG. It consists of V_VOBU_ADR indicating the position.

FIG. 12 is an audio VOBU table shown in FIG. 9, and is composed of VOBU_A_SZ indicating the size of an audio VOBU, VOBU_A_PBTM having reproduction time information of an audio VOBU, and the like.

FIG. 13 is a table showing the details of the audio reference map shown in FIG. 9, from A_RMAP_INDEX indicating the index of the reference map given to a certain number of audio VOBUs and from the position at which audio data starts in the VOB to the VOBU indicated by A_RMAP_INDEX. It is composed of A_VOBU_ADR and the like indicating the position of the VOBU as size information.

Fig. 14 is an operational flowchart of the method for recording still images according to the present invention. First, a physical area to be recorded on the disc is secured in advance (step S101). This area is to use an area that is not currently recorded.

Next, externally input still pictures and audio data added to the still pictures are recorded in one VOBU unit or each VOBU unit in the VOB (step S102). For each VOBU recorded in this way, video size, audio size, audio reproduction time information, and the like in the VOBU are stored in the memory (step S103).

After all the recording operations have been completed (step S104), the cell and the VOB information data are generated using the stored information and recorded on the disk, because the information data cannot be recorded in the middle of recording the still data.

Here, the cell and VOB information of the data structure according to an embodiment of the present invention, as shown in Figs. 4, 5 and 6, information about the range in the VOB pointed by the cell, and all still pictures in the VOB are recorded. It includes information on the number of VOBUs and RMAPs, video size information, audio size and audio reproduction time information, and reference map information for reducing the amount of calculation during playback as shown in FIG.

The cell and VOB information of the data structure according to another embodiment of the present invention includes information on the range in the VOB pointed to by the cell as shown in FIGS. 9, 10, and 12, and a video VOBU in which all still pictures in the VOB are recorded. Field size information, number of video VOBU and video RMAP information, number of audio VOBU and audio RMAP information, size of audio VOBU and play time information of audio VOBU. Includes video reference map and audio reference map information to reduce the amount of.

FIG. 15 is a flowchart illustrating a method of reproducing a still picture according to the present invention. If a user wants to play back from a specific position in a specific cell of a specific PGC through an interface with a user, first, PGC information is read out to a cell to be played back in the PGC. Read the information (step S201). From the cell information, the corresponding VOB and the start address of the VOB are read (step S202). For example, the desired location information may be obtained by adding the size information up to the VOBU of the desired location by using the VOBU table shown in FIG. 6 and the reference map shown in FIG. 7 (S203).

The video data is read and decoded at the position of the video VOBU for the still picture thus obtained (step S204). If the size of the audio data is not " 0 " in the VOBU map shown in FIG. 6, that is, the audio data exists (step S205), the audio data is read and decoded and the reproduction operation is completed (step S206).

As another example, using the video VOBU table shown in FIG. 10 and the video reference map shown in FIG. 11, the size information up to the VOBU of the desired still position can be obtained. If the audio VOBU ID is included in the video VOBU table, the audio data is obtained. Since the audio VOBU table shown in FIG. 12 and the audio reference map shown in FIG. 13 correspond to the desired audio position, the audio data is decoded.

The present invention can cope with the effect of recording a large amount of still images and audio data added thereto using a minimum amount of information data, and displaying and editing each of the still images as well as after-recording of the audio data.

Claims (29)

In the data structure for a rewritable disc: A data structure for defining and storing a plurality of still picture data in recording / reproducing unit, and storing additional information for accessing the recording / reproducing unit. The VOB of claim 1, wherein the recording / reproducing unit is a VOB (Video Object), the additional information is cell information, the cell information may correspond to the entire VOB, and a part of the VOB for efficient information management. Data structure, characterized in that can represent. The data structure of claim 2, wherein audio data added to the still picture is included in the recording / reproducing unit, and the video data and the audio data for the still picture are stored in one minimum recording / reproducing unit. 4. The data structure of claim 3, wherein the minimum recording / reproducing unit is a video object unit (VOBU). The audio data added to the still picture is included in the recording / reproducing unit, and the audio data is stored in a predetermined area within the recording / reproducing unit in a separate minimum recording / reproducing unit. Data structure. The data structure of claim 2, wherein the cell information includes an identifier of an actual VOB represented by a cell, start position information and end position information at the time of reproduction of the cell, and the like. 7. The VOB information accessed by the identifier of the VOB includes an identifier of the VOB, start position information of the VOB, information on the number of all VOBUs in the VOB, information on the number of reference maps, a VOBU table, a reference map, and the like. Data structure. 8. The audio data of claim 7, wherein the VOBU table includes size information occupied by video data for each VOBU, size information occupied by audio data for each VOBU, reproduction time information of audio data, and the like. And if there is none, audio size information and audio reproduction time information are displayed as " 0 ". 8. The data structure of claim 7, wherein the reference map includes an index of the reference map, size information from the start of the VOB to the VOBU indicated by the index of the reference map, and the like. 6. The VOB information accessed by the identifier of the VOB includes: a VOB identifier, start position information of the VOB, size information of all video VOBUs in the VOB, number information of all video VOBUs in the VOB, and all audio VOBUs in the VOB. And information on the number of video reference maps, information on the number of audio reference maps, video VOBU tables, video reference maps, audio VOBU tables, audio reference maps, and the like. The data structure according to claim 10, wherein the video VOBU table includes size information of the video VOBU, identification information of the audio VOBU, and the like. 12. The data structure of claim 11, wherein the video reference map includes an index of a reference map provided for each predetermined number of video VOBUs and size information from a start of a VOB to a VOBU represented by an index of the reference map. . 12. The data structure of claim 11, wherein the audio VOBU table includes size information of an audio VOBU, reproduction time information of an audio VOBU, and the like. 12. The audio reference map of claim 11, wherein the audio reference map includes an index of a reference map provided for each predetermined number of audio VOBUs and size information from a position at which audio data starts in a VOB to a VOBU indicated by the index of the reference map. Data structure. A recording / playback apparatus for recording and playing back audio and / or video (A / V) data on a rewritable disc: The still image data input during recording is encoded in the minimum recording / reproducing unit so that the encoded data and the encoded size information are provided to store the plurality of still image data in the recording / reproducing unit on the disc, and the still image read out from the disc during reproduction. An AV codec for decoding data; And A system controller for recording additional information for accessing the recording / reproducing unit by using the encoded size information during recording, and controlling the still image data at a point desired by the user to be read using the additional information during reproduction. Record and playback device. 16. The recording / reproducing unit according to claim 15, wherein the recording / reproducing unit is a VOB (Video Object), and the additional information includes cell information having information related to display such as a reproduction order and information about a recorded position of the still picture data. And a VOB information recording and reproducing apparatus. 16. The apparatus of claim 15, wherein the minimum recording / reproducing unit is a video object unit (VOBU), and when there is audio data added to the still image, the AV codec is a unit of one VOBU unit for video data and audio data for the still image. And encoding encoded size information and reproduction time information of the encoded audio data. 18. The apparatus of claim 17, wherein when there is audio data added to the still picture, the VOB information includes a VOBU table and a reference map, and the VOBU table includes size information occupied by video data for each VOBU and information on each VOBU. And size information occupied by the audio data, reproduction time information of the audio data, and the like. 16. The apparatus of claim 15, wherein the minimum recording / reproducing unit is a video object unit (VOBU), and when there is audio data added to the still image, the AV codec separates the video data and the audio data for the still image into separate VOBU units. And encoding encoded size information and reproduction time information of the encoded audio data, wherein the encoded A / V data is disposed in the video VOBU area and the audio VOBU area in one VOB, respectively. Device. 20. The recording and reproducing apparatus according to claim 19, wherein when there is audio data added to the still picture, the VOB information includes the video VOBU table and reference map, and the audio VOBU table and reference map. 18. The system controller of claim 17, wherein the system controller searches for a desired position by combining the start position information of the VOB and the size information up to the desired VOBU using the VOB information data. Record and playback device. 19. The recording apparatus as claimed in claim 18, wherein the system controller searches for a desired position by retrieving the desired position of the video and audio data to the VOBU of the desired position in the VOB using a VOBU table and a reference map during playback. Playback device. 20. The system controller of claim 19, wherein the system controller searches for a desired position by combining the start position information of the VOB and the size information up to the desired VOBU using the VOB information data. Record and playback device. 21. The system controller of claim 20, wherein the system controller acquires the position information of the desired position of the video and audio data up to the VOBU of the desired position in the VOB using respective VOBU tables and reference maps for video and audio. Recording and reproducing apparatus, characterized in that finding. A method of recording and playing back audio and / or video (A / V) data on a rewritable disc: (a) encoding input still image data into a VOBU (Video Object Unit), constructing and recording a VOB (Video Object); (b) storing video size information in the VOBU; And and (c) generating all the VOB information and cell information for accessing the VOB by using the information stored in the step (b) after recording all the recording operations and recording them on the disc. The method of claim 25, wherein the method is (d) if there is audio data added to the still image, recording and configuring the video data and the audio data for the still image in one VOBU unit; (e) storing audio size and audio reproduction time information for the audio VOBU; And (f) recording and reproducing the information stored in the step (e) after the completion of all the stop operations. The method of claim 25, wherein the method is (g) if there is audio data added to the still picture, constructing and recording audio data in a VOBU unit separate from the still picture data in the VOB; (h) storing audio size and audio reproduction time information for the audio VOBU; And and (i) including and recording the information stored in the step (h) after the completion of all stop operations in the VOB information. The method of claim 25, wherein the method is (j) obtaining a start position for a VOB to be reproduced by a user using the cell information; And and (k) reproducing still image data at a desired position by using the VOB information. The method of claim 28, wherein the method is (l) reproducing the audio if there is audio data added to the still image.