KR20000002921A - Reconstruct data structure for still image and apparatus and method of reading and writing still image - Google Patents

Abstract

PURPOSE: A data structure for a still image is provided to store a large quantity of still images to a disk capable of restoring data. The data structure is suitable for after recording of audio data corresponding to the still image. An apparatus and a method of reading and writing still image is provided to display and edit the large quantity of still images in units of a still image. CONSTITUTION: An apparatus of reading and writing still image stores a plurality of still images after defining the still images to a reading/writing unit, has additional information to access the reading/writing unit. and stores an audio data corresponding to the still image after defining a reading/writing unit, thereby, the large quantity of still images and the audio data corresponding to the images are written by using a minimal information data, and are displayed and edited in terms of the still image. In addition, the apparatus can provide after recording operation.

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 efficient information data with a large amount of still images 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 having a.

In order to achieve the above another object, the data structure according to the present invention is characterized in that the audio data added to the still picture is separately defined and stored in recording / reproducing unit.

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 a data structure according to an embodiment of 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 video VOB information accessed by the video VOB ID shown in FIG. 4.

FIG. 6 is a table showing details of audio VOB information accessed by the audio VOB ID shown in FIG. 4.

FIG. 7 is a table illustrating details of a video VOBU table illustrated in FIG. 5.

FIG. 8 is a table illustrating details of a video reference map illustrated in FIG. 5.

FIG. 9 is a table illustrating details of an audio VOBU table illustrated in FIG. 6.

FIG. 10 is a table showing details of an audio reference map shown in FIG. 6.

11 is a flowchart according to an embodiment of the still picture recording method according to the present invention.

12 is a flowchart according to an embodiment of a still picture reproduction 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 using a predetermined compression scheme, and provides size information on the compressed data for each VOBU. 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 user's key input, and uses the cell information recorded on the disk and the VOB information of various sizes and location information of the recorded data. Control the entire system to play the desired data.

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

In one cell, a video VOB for audio and a VOB for audio may exist respectively. When audio is added to a still image, audio is recorded in a separate VOB. For such a data structure, the VOB ID corresponding to the audio and the VOB ID corresponding to the video must be separately included in the cell information, and information about the start and end of the cell must be prepared based on the video. If there is audio corresponding to video through the video VOBU table, the VOBU ID information in the audio VOB can be known. That is, audio data is data of a property that cannot be accessed alone. Audio VOBU # 1, VOBU # 2, and VOBU # 3 shown in FIG. 3 are audio data related to video VOBU # 1, VOBU # 4, and VOBU # 6, respectively.

FIG. 4 is a table showing details of cell information having information about the cell shown in FIG. 3, V_VOB_ID having a video VOB ID indicated by the cell, A_VOB_ID indicating an audio VOB ID included in the cell; C_S_VOBU_ID indicating the start position in the video VOB when the cell is played, C_E_VOBU_ID indicating the end position in the video VOB and the like when the cell is played.

FIG. 5 is a table showing details of video VOB information having information about a video VOB accessed by V_VOB_ID shown in FIG. 4, and having VOB_ID indicating the ID of the VOB and starting position information of the video VOB. It consists of V_VOB_ADR, VOBU_V_Ns with the number of all static VOBUs in VOB, RMAP_V_Ns with the number of reference maps, video VOBU table (V_VOBU_TABLE) with detailed information in VOBU units, and video reference map (V_RMAP). .

FIG. 6 is a table showing details of audio VOB information having information about an audio VOB accessed by A_VOB_ID shown in FIG. 4, showing the VOB_ID indicating the audio VOB ID and the starting position information of the audio VOB. A_VOB_ADR with VOBU_A_Ns with information about the number of all audio VOBUs in the VOB, RMAP_A_Ns with information about the number of reference maps, audio VOBU table (A_VOBU_TABLE) with detailed information in VOBU units, and audio reference map (A_RMAP) It consists of.

FIG. 7 is a detail of a video VOBU table having detailed information in every VOBU unit with respect to the video VOB shown in FIG. 5, and is added to VOBU_V_SZ, which is a size occupied by video data, for each VOBU. If there is audio data, it is composed of VOBU_A_ID having ID information of the audio VOBU. If there is no audio data, the VOBU_A_ID information is displayed as "0" to indicate that there is no audio data.

FIG. 8 is a detailed description of the video reference map shown in FIG. 5 and shows V_RMAP_INDEX indicating the index of the reference map given for each fixed number of video VOBUs and size information from the start of the VOB to the VOBU indicated by V_RMAP_INDEX, indicating the position of the VOBU. It consists of V_VOBU_ADR and so on. RMAP_INDEX is generated for a certain number of VOBUs. In FIG. 3, RMAP_INDEX is configured for every three VOBUs.

FIG. 9 shows details of the audio VOBU table shown in FIG. 6, and is composed of VOBU_A_SZ indicating the size of the audio VOBU, VOBU_A_PBTM having reproduction time information of the audio VOBU, and the like.

FIG. 10 is a detailed description of the audio reference map shown in FIG. 6, in which A_RMAP_INDEX indicating the index of the reference map given for a certain number of audio VOBUs and the size information from the start position of the audio VOB to the VOBU indicated by A_RMAP_INDEX. A_VOBU_ADR indicating a location.

In order to find a specific position in the middle of the cell by using such information, the start position information (VOB_ADR) of the video VOB shown in FIG. 5 and the size information (VOBU_V_SZ) occupied by each video VOBU as shown in FIG. 7 are added together. You can go to the location. 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. That is, the video reference map shown in Fig. 8 having such a function is used.

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 video VOB corresponding to this cell is obtained from the cell information, the VOB information corresponding to the V_VOB_ID is interpreted to know the start position (VOB_ADR) of the video VOB, and the address value corresponding to the first index of the video reference map ( RMAP_INDEX) and the fourth size information in the video VOBU table are added to obtain the size information from the first to fifth VOBUs of the video VOB, and the size of the VOB starting position and the size up to the desired VOBU is added to determine the position to play. Thus, playback from the desired position is possible. If there is additional audio, it is also possible to play the desired audio through the above process.

Fig. 11 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 for using an area not currently recorded.

Next, externally input still pictures and audio data added to still pictures are recorded in VOBU units, and the video VOBU for still pictures is recorded in the video VOB, and the audio VOBU for these still pictures is recorded in a separate audio VOB (S102). step). 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 operation is completed (step S104), the cell information data and the VOB information data are generated and recorded on the disk using the stored information, because the information data cannot be recorded in the middle of recording the still data. to be. The cell and VOB information includes information on the range within the video VOB pointed to by the cell as shown in Figs. 4, 5, 6, 7, and 9, and size information of the VOBU in which all still pictures in the video VOB are recorded. Audio size and playback time information are included in the audio VOB, and video reference map and audio reference map information are included to reduce the amount of calculation during playback as shown in FIGS. 8 and 10.

12 is a flowchart illustrating a method of reproducing still images according to the present invention. If a user wants to play back from a specific VOBU position in a specific cell of a specific PGC through an interface with a user, first, PGC information is read and a cell to be played back in the PGC is shown. Read the information on (step S201). From the cell information, positional information of each of the video VOB and the audio VOB is obtained (step S202). Such position information may be obtained by adding the size information up to the video VOBU of a desired position using the video VOBU table shown in FIG. 7 and the video reference map shown in FIG. 8 (step 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 audio ID is not "0" in the video VOBU map shown in FIG. 7, that is, if audio data exists (step S205), the audio VOBU table shown in FIG. 9 and the audio reference map shown in FIG. 10 are used. Then, the position is obtained by adding the size information up to the VOBU of the desired position, and the audio data is read and decoded from this position to complete the playback operation (step S206).

The present invention has the effect of recording and reproducing a large amount of still images and audio data added thereto using minimal information data, and displaying and editing them in respective still images units, and can correspond to after-recording of audio data.

Claims (26)

In the data structure for a rewritable disc: A data structure that defines and stores a plurality of still picture data in recording / reproducing units, and has additional information for accessing the recording / reproducing unit. The data structure according to claim 1, wherein the audio data added to the still picture is defined and stored separately in a recording / reproducing unit. 3. The recording / reproducing unit according to claim 2, wherein the recording / reproducing unit is a VOB (Video Object), video data for actual still picture is present in a VOB (Video Object) for video, and the audio data is audio separate from the VOB for video. And the additional information is separately managed for the video VOB information and the audio VOB information. The data structure of claim 1, wherein the additional information is cell information, and the cell information may correspond to the entire VOB, and may represent a part of the VOB for efficient information management. 5. The cell information according to claim 4, wherein the cell information includes a video VOB ID indicated by the cell, an audio VOB ID included in the cell, start and end position information in the video VOB when the cell is played back, and the like. Data structure. The video VOB information according to claim 3, wherein the video VOB information includes an identifier of a VOB, start position information of the video VOB, information on the number of all still video object units (VOBUs) in the VOB, information on the number of reference maps, and detailed information on a VOBU unit. A data structure comprising a video VOBU table and a video reference map. 7. The video VOBU table according to claim 6, wherein the video VOBU table includes a size occupied by video data for each VOBU, and ID information of an audio VOBU when there is audio day added for each VOBU. If none, the audio VOBU ID information is indicated by " 0 ". The video reference map of claim 6, wherein the video reference map includes an index of a reference map provided for each predetermined number of video VOBUs and size information from the start of the video VOB to the VOBU indicated by the index of the reference map. Data structure. The audio VOBU table according to claim 3, wherein the audio VOB information includes an ID of a VOB, start position information of an audio VOB, information on the number of all audio VOBUs in the VOB, information on the number of reference maps, and detailed information in units of VOBU. A data structure comprising an audio reference map and the like. 10. The data structure according to claim 9, wherein the audio VOBU table includes size of an audio VOBU and information on reproduction time of an audio VOBU. 10. The audio reference map of claim 9, 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. The recording / reproducing unit according to claim 12, 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. 15. The apparatus of claim 13, wherein the minimum recording / reproducing unit is a video object unit (VOBU), and when there is audio data added to the still picture, the AV codec encodes the audio data in VOBU units to separate the video VOB. And recording and storing the audio VOB on the disc, and further providing size information and reproduction time information of the encoded audio data. The recording and reproducing apparatus according to claim 13, wherein when there is audio data added to the still picture, the VOB information includes video VOB information for the still picture and audio VOB information for audio data recorded in a separate VOB. The recording and reproducing apparatus according to claim 15, wherein the video VOB information and the audio VOB information include respective VOBU tables and reference maps. The system controller of claim 15, wherein the system controller finds a desired position by adding the desired position of the video and audio data together with the start position information of each VOB and the size information up to the desired VOBU using the respective VOB information data. A recording and reproducing apparatus, characterized in that. 17. The system controller of claim 16, wherein the system controller searches for a desired position by retrieving the position information of the desired position of the video and audio data up to the VOBU of the desired position in the VOB by using the respective VOBU table and the reference map. The recording and playback apparatus. 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 19, wherein the method is (d) encoding the audio data added to the still picture by VOBU to form and record an audio VOB separately from the still picture data; (e) storing audio size and audio reproduction time information for the audio VOBU; And (f) recording and reproducing the audio VOB information after completing all recording operations. 21. The recording and reproducing method according to claim 20, wherein the video VOB information and the audio VOB information include respective VOBU tables and reference maps. The method of claim 19, (g) obtaining a start position for a VOB to be reproduced by a user using the cell information; And and (h) reproducing still data at a desired position using the VOB information. The method of claim 21, (i) obtaining a start position of a video VOB to be played by a user using the cell information; And and (j) reproducing still data at a desired position by adding the video VOB start position information and size information up to a desired VOBU using the video VOB information. 24. The recording and reproducing method according to claim 23, wherein in the step (j), position information up to the VOBU of the desired position in the VOB is reproduced using the video VOBU table and the reference map to reproduce the still data at the desired position. The method of claim 23, wherein (k) recording and reproducing the audio data at a desired position by adding the audio VOB start position information and the size information up to a desired VOBU by using the audio VOB information if there is audio data added to the still image. . 26. The recording and reproducing method according to claim 25, wherein in the step (k), the audio data of the desired position is reproduced by obtaining the position information up to the VOBU of the desired position in the VOB using the audio VOBU table and the reference map.