KR20040033663A - Information storage medium having data structure for multi-angle and apparatus therefor - Google Patents

Abstract

PURPOSE: A data storage media and its playing system are provided to record plural clips for certain angles at separate positions on a continuous record space so that it makes it possible to randomly access and efficiently arrange moving picture data. CONSTITUTION: The media has a data structure comprising an AV(Audio Video) stream, a clip information file, a play item, a play list, and a jumping point map. The AV stream is compressed and encoded for each angle. The clip information file includes encoding attribute data for each AV stream. The play item designates the time based on a playing interval between an in_time and an out_time in the clips. The play list includes one or more play items. The jumping point map makes a table for the positions of jumping points and records the positions.

Description

Information storage medium having data structure for multi-angle and apparatus therefor}

The present invention relates to an information storage medium recorded in a data structure supporting multiple angles, and an apparatus thereof.

A typical example in which multi-angle data is recorded in a conventional information storage medium is DVD. In the DVD, multi-angle data is recorded in an interleaving method in which data is divided into predetermined units and recorded alternately.

The data structure of a DVD video, which is a conventional multimedia playback apparatus, is as follows.

1 shows the data structure of a DVD.

Referring to FIG. 1, a DVD, which is one of multimedia storage media, divides a disc into a VMG area and a plurality of VTS areas, stores title information and title menu information in the VMG area, and title information in the plurality of VTS areas. . Usually, the VMG area is composed of two to three files, and each VTS area is composed of three to twelve files.

2 shows a data structure of a VMG region.

Referring to FIG. 2, the VMG area includes a VMGI area storing additional information about the VMG area, a VOBS area storing video information about a menu, and a backup area of the VMGI. Each of these sections exists in one file, but the VOBS region does not necessarily exist and may not be stored in some cases.

The VTS area stores information about a title, which is a playback unit, and VOBS, which is video information. A plurality of titles may be recorded in one VTS.

3 shows a data structure of a VTS region.

Referring to FIG. 3, video title set information VTSI (Video Title Set Information), VOBS which is video data for a menu screen, VOBS that is video information of a video title set, and backup data of VTSI are recorded in the VTS area. The presence or absence of VOBS for displaying the menu screen is optional. Each VOBS is divided into VOB and CELL which are recording units. One VOB consists of a plurality of CELLs. The smallest unit of the recording units handled in the present invention is CELL.

In DVD, playback units are layered. There is a title on the top floor. A title is composed of one or more PGCs. The first PGC reproduced among the plurality of PCGs is called an entry PGC. 4 shows a title composed of only one PGC, that is, Entry PGC, and FIG. 5 shows a title composed of a plurality of PGCs. As shown in FIG. 5, when the playback of one PGC is finished and the next PGC is played, when selecting one of several PGCs to be played, selecting which PGC can be stored as a command on the DVD. . This control of the order of reproduction is called navigation. The command for determining the reproduction order is stored in the PGCI.

6 shows the data structure of the PGC.

Referring to FIG. 6, the PGC is stored in an information structure called PGCI. The PGCI consists of a pre command, a post command, and a plurality of program information in which a navigation command is stored. The precommand is a command performed before the playback of the PGC, and the post command is a command performed after the playback of the PGC. Each program consists of a plurality of cell information. This cell is connected one-to-one with a cell in the VOB, which is a recording unit. Each cell, which is a reproduction unit, has a cell command executed after the reproduction of the cell. As described above, the PGCI information has a hierarchical description of PGC, which is a reproduction unit, and an information structure that connects a cell, which is the lowest reproduction unit, with a cell, which is the lowest unit of the recording unit.

In particular, the PGC is composed of a plurality of cells, which are reproduction units. In this case, the plurality of cells may form an angle block.

7 shows an angle block.

As shown in FIG. 7, a part in which a plurality of cells are arranged in parallel to reproduce one cell is called an angle block. The cells constituting the angle block have the same reproduction time and correspond to each angle. When a cell, which is a reproduction unit, forms an angle block, each angle data divided into interleaved units (ILVU), which is a predetermined unit, is interleaved and recorded in a VOB, which is a recording unit, and a cell, which is a recording unit.

8 shows VOB and Cell as recording units in the case of not having multiple angles.

Referring to FIG. 8, each VOB is stored in a contiguous block, which is a continuous recording space of an information storage medium, and recorded in sequence. However, in the case of a multi-angle, as shown in FIG. 9, each VOB corresponding to each angle and cells which are lower units thereof are recorded as interleaved blocks interleaved in ILVU units. Therefore, one angle data is not stored in the continuous recording space. Each angle data should be recorded interleaved in turn.

9 shows an example in which two angle data are interleaved and recorded in order.

9, each ILVU should have the same playback time. The amount of recording length of the data may vary depending on the compressed result. In order to reproduce the interleaved data, when an angle is played back or an angle is played back, jumping is required in ILVU data units. For example, in order to reproduce angle 1 data, only ILVU data corresponding to angle 1 needs to be searched and reproduced. To this end, as shown in FIG. 11, NXT_ILVU_SA and NXT_ILVU_SZ data are stored in the video bitstream, which is information that informs the position and size of ILVU data to be concatenated following the ILVU data to which the corresponding bit stream belongs. Therefore, after the reproduction of the ILVU data to which the corresponding bitstream ends, the information is jumped to the next ILVU data using this information. If you want to change the angle during playback, you must jump to a specific position that corresponds to the changed angle. The jumping position at this time is also determined in ILVU units.

10 shows the jumping for playing at the selected angle from the standpoint of the cells in the playing order.

Referring to FIG. 10, in order to seamlessly change an image without being interrupted, even when an angle change command of a user is received at a specific position, playback is performed by jumping to the next subsequent ILVU data of another angle after the corresponding ILVU data is finished. do. The positional information of the ILVU data is interleaved into the bitstream of the interleaved and recorded moving picture data. As shown in FIG. 12, in the moving picture bitstream, SML_AGL_Cn_DSTA, which is the position and size information of the ILVU data for nine angles, the maximum number supported by the DVD, is recorded. These pieces of information are used to find the ILVU data of angle n connected with the ILVU data currently being reproduced. After the reproduction of the current ILVU data, this information can be used to change the angle to a desired angle.

Referring to the authoring process of a DVD for multi-angle, first, each image taken from various angles is compressed to form bitstream data having the same reproduction length. One bitstream is constructed by interleaving, and information that can refer to different angles in each bitstream is inserted so that angle switching is possible even during reproduction.

When multi-angle data is divided into small pieces and interleaved and stored, even when one angle is continuously played, the data is not continuously recorded, and thus the play position for reading data is continuously changed. . At this time, there is a problem in that the bit rate of the compressed bitstream is limited to compensate for the case where a certain time is required for the position change, such as an optical disk or a hard disk.

Accordingly, it is an object of the present invention to provide an information storage medium and apparatus thereof recorded in a data structure capable of random access, eliminating the positional constraint in which multi-angle data is stored.

1 is a data structure diagram of a DVD;

2 is a data structure diagram of a VMG area;

3 is a data structure diagram of a VTS region;

4 is an example of a title consisting of only one PGC, that is, Entry PGC;

5 is an example of a title consisting of a plurality of PGCs connected;

6 is a data structure diagram of a PGC;

7 is a configuration diagram of an angle block;

8 is a structural diagram of a VOB and a cell as recording units in the case of not having multiple angles;

9 is an example in which two angle data are interleaved and recorded in order;

10 is a reference diagram showing a jump for playing at a selected angle from the standpoint of the cells in the playing order;

11 is an information structure diagram included in a video bitstream including ILVU data corresponding to angle 1;

12 is an information structure diagram included in a video bitstream supporting a plurality of angles;

13 is a reference diagram showing the correlation between PlayList, PlayItem, Clip Information, Clip,

14 is a data structure diagram of a jumping unit and a jumping point;

15 is a structural diagram of a plurality of clips for multi-angle,

16 is a relationship between a jump operation and a buffer for reproducing video data without interruption;

17 is a structural diagram of a PlayList having a multi-angle structure according to the present invention;

18 shows a first embodiment of a data structure for a jump point,

19 shows a second embodiment of a data structure for a jump point;

20 shows a third embodiment of a data structure for a jump point;

21 is an example of PlayList information having PlayItems forming an angle block;

22 shows an example in which PlayList, which is a playback unit, is configured for each angle;

As shown in Fig. 23, a structure diagram of information recorded separately for what angle the PlayList represents,

24 to 26 are reference diagrams for explaining an information storage medium and an apparatus thereof according to another embodiment of the present invention;

27 to 31 illustrate the structure and features of multi-angle video data according to the present invention.

According to the present invention, in the information storage medium recording the moving picture data for the multi-angle, the object comprises a clip as a recording unit for storing the moving picture data for each angle, at least one clip for a predetermined angle It is achieved by an information storage medium, characterized in that each is recorded separately in a continuous recording space of the information storage medium.

The moving picture data for each angle has a plurality of jump points as access points for connection reproduction to different angles, and further includes additional information in which information about the jump points is recorded.

Preferably, the video data has clip information which is additional information about the clip, and information of the jump points is recorded in the clip information.

The information on the jump points is information on the position from the start position of the clip to each jump point, and they are preferably stored in a table form in the clip information.

In the clip information, entry point information, which is information about randomly accessible points, is recorded, and information about the jump points is added to the entry point information to indicate whether the entry point serves as a jump point. Preferably stored as.

The information on the jump points is separately recorded in common to the clips of the angle data, and the common jump point information is stored in the form of a table in which position information about each jump point of each clip is sequentially recorded. The clip information included in each angle block is preferably configured to refer to the information.

Each of the jump points is preferably set to the interval and position of the jump point to enable continuous playback when the playback position is changed at the jump point during the playback of the change to another angle during the playback of one particular angle clip.

The play list information corresponding to each one clip and the play list information consisting of the plurality of play items are recorded as information of a reproduction unit, and the information for the plurality of angles is provided when the plurality of play items form one angle block. It is preferable that the information on the recording be expressed as being recorded.

Preferably, the play list information corresponding to each one clip and the play list information consisting of the plurality of play items are recorded in addition to the information of a reproduction unit and one play list is recorded so as to correspond to one angle.

It is preferable that additional information representing a specific angle is added to the play list recorded so as to correspond to each one angle as information on a plurality of angles.

In the clip information, entry point information, which is information about randomly accessible points, is recorded. Since all the entry points are the jump points at the same time, the information on the jump points is preferably the entry point information.

It is preferable that the section in which no jumping occurs immediately after the playback or immediately after the jumping for the clip is determined, and the size of the section in which the jumping does not occur is determined so that no underflow of the buffer occurs.

In the clip information, preferably, information about a section determined so that jumping does not occur immediately after playback or immediately after jumping for the clip is recorded.

On the other hand, according to another field of the present invention, the object is a plurality of moving picture data is divided and recorded into a clip which is a recording unit, the clip is recorded separately in a continuous recording space, in addition, the clip is the corresponding video data A reproducing apparatus for reproducing the information storage medium in which information, which is moving picture data corresponding to one angle, is recorded in the case of multi-angles, wherein the multi-angle moving picture data is searched for a corresponding clip and the data is stored in a continuous space. This is achieved by a reproducing apparatus characterized by reading out and reproducing.

The video data for each angle has a plurality of jump points for connection playback to different angles, and the information about these jump points is recorded in the information storage medium as additional information, and when the video data is multi-angle video data during playback, the corresponding clip If you need to play the data after reading the data in a contiguous space and change the angle, playback is performed from the corresponding jump point of the clip for the other angle data at the jump point, and the two jump points are in each clip for the same playing time. It is preferable to indicate the location information.

Each of the moving image data has a clip information, which is additional information about a clip which is the recording unit, and the information of the jump points is recorded in the clip information, and the reproducing apparatus stores information about the jump points. It is desirable to find it in the clip information of the clips.

The information on the jump points is information on the position from the start position of the clip to each jump point and they are stored in a table form in the clip information, and the playback apparatus is used in the table of the clips constituting the multi-angle. It is preferable to estimate that the jump points having the same information recording position are connected to each other, and to find and reproduce the positions of the jump points which are connected to each other when reproducing the change to another angle.

In the clip information, entry point information, which is information about randomly accessible points, is recorded, and information about the jump points is added to the entry point information to indicate whether the entry point serves as a jump point. Is stored as

The playback apparatus assumes that jump points having the same entry point information recording positions that also function as jump points in the entry point information of the clips constituting the multi-angles are connected to each other, and that the jump points are connected to each other when the reproduction of the change to another angle is performed. It is desirable to find and play.

The information about the jump points is recorded in common to the clips of the angle data, and the common jump point information is stored in the form of a table in which position information about each jump point of each clip is sequentially recorded. Preferably, the reproducing apparatus reads the common jump point information common to the clips constituting the multi-angles, and finds and reproduces the positions of the jump points connected to each other when changing to another angle.

Each of the jump points is set to the interval and position of the jump point so that continuous playback is possible when the playback position is changed at the jump point during the playback of the change to the other angle during the playback of one specific angle clip. Even when an angle change signal is inputted, it is preferable to complete the playback up to the jump point closest to the current playback position and to start playback from the jump point connected to the next angle, so that playback can be performed continuously.

Play list information consisting of a play item corresponding to each one clip and the plurality of play items is recorded as information of a playback unit, and the play item designates all or a part of the clip and information for a plurality of angles. As information on a plurality of play items forming one angle block is recorded, the playback apparatus plays one of the play items when the plurality of play items forming the angle block is played, It is desirable to play the play item.

Play list information consisting of a play item corresponding to each one clip and the plurality of play items is recorded as information of a reproduction unit, and the play item designates all or a part of the clip. It is preferably recorded so as to correspond to one angle, and the reproducing apparatus reproduces a play list corresponding to the angle.

Preferably, the play list is added with information about an angle corresponding to each play list, and the reproducing apparatus reproduces a play list corresponding to the angle.

On the other hand, according to another field of the present invention, the above object is a recording device for recording a plurality of angle video data on an information storage medium having a random access function, the information storage of the clip which is a recording unit of the video data corresponding to each angle It is also achieved by a recording apparatus characterized by recording in a contiguous space of a medium and consequently recording each angle video data separately from each other without interleaving and recording on the information storage medium.

In addition to the video data for each angle, it is preferable to create a plurality of jump points for connection reproduction to different angles, and to record information about these jump points as additional information in the information storage medium.

It is preferable to add the clip information which is additional information about the clip which is the said recording unit in addition to each said video data, and to record the information of the said jump points to the said information storage medium.

The information on the jump points is information on the position from the start position of the clip to each jump point and the recording device preferably records them in the information storage medium in the form of a table in the clip information.

The recording device records entry point information, which is information about points that can be randomly accessed, in the clip information, and information about the jump points is added to the entry point information to indicate whether the entry point also serves as a jump point. It is desirable to store it in the form of information.

The recording apparatus records information about jump points in common to the clips of the plurality of angle data, and the common jump point information is in a table form in which position information about each jump point of each clip is sequentially recorded. It is desirable to store.

The recording device records and records the jump point intervals and positions so that the respective jump points can be continuously played when the playback position is changed at the jump point during the playback of the change to another angle during the playback of one specific angle clip. desirable.

The recording apparatus adds and records play list information including a play item corresponding to the one clip and the plurality of play items as information of a reproduction unit, and the information for the plurality of angles includes a plurality of play items in one angle block. It is desirable to record as information on what is achieved.

Preferably, the recording apparatus adds and records the play list information corresponding to the one clip and the play list information including the plurality of play items as information of a reproduction unit, and records one play list so as to correspond to one angle. .

It is preferable that the recording apparatus adds and records additional information indicating a specific angle to the play list recorded so as to correspond to each one angle as information on a plurality of angles.

The present invention implements multi-angle by recording each angle data in a separate recording method rather than an interleaving method. In other words, a multi-angle is implemented by separately recording the corresponding bitstream in each continuous recording space. To change to another angle, each angle data is divided into a jumping unit (JPU), the starting address of the jumping unit is designated as a jumping point, and the jumping point of each angle data is recorded as additional information. However, when both the entry point and the jumping point are the same, the jumping point can be found by referring to the information indicating the entry point.

Listing the components of the present invention for this purpose is as follows.

1) Compressed coded AV stream (clip) for each angle

2) Clip information file containing corresponding AV stream coding attribute information

3) Play item specifying the time based on the playback section between IN_time and OUT_time in the clip consisting of 1) and 2).

4) Playlist consisting of one or more play items

5) Jumping point map that records the locations of the jumping points in a table

In the present invention, the multi-angle means that the video data corresponding to a specific time is composed of a plurality of playback units instead of one. In other words, the data taken by multiple cameras is made into a video. Audio data is generally the same, but can be configured differently for each angle. In summary, video data that can be reproduced in the same time band is called multi-angle data, and the content thus produced is called multi-angle content.

Video data is massively compressed and then stored or transmitted as a compressed bitstream. In the present invention, the terms Clip are used as recording units, PlayList PlayList and PlayItems as Play units. In this case, Clip corresponds to Cell, which is a recording unit in DVD, and PlayList and PlayItem have the same concept as programs and cells, which are playback units in DVD.

That is, in the information storage medium according to the present invention, an AV stream is recorded in units of Clips. In a normal case, a Clip is recorded in a continuous space. The AV stream is compressed and recorded to reduce the capacity. In order to reproduce the recorded clip, it is necessary to know the characteristic information of the compressed moving picture data. Therefore, Clip Information is recorded for each Clip. The Clip Information records an audio and video attribute of each clip and an entry point map that records location information of entry points that can be randomly accessed in units of a predetermined interval. In MPEG, which is widely used as a video compression technology, the entry point is the position of an I picture that compresses an intra picture. The entry point map is mainly used for time searching to find a point where some time has passed since the start of playback.

13 shows correlations between PlayList, PlayItem, Clip Information, and Clip.

Referring to Fig. 13, PlayList is a basic unit of reproduction. A plurality of PlayLists are stored in the information storage medium according to the present invention. One PlayList is composed of a plurality of PlayItems. PlayItem corresponds to a part of a Clip, and is specifically used in the form of designating a playback start time and end time in the Clip. Therefore, the location of the corresponding part in the actual clip is found by using the Clip Information.

Hereinafter, the data structure and the recording position for the multi-angle will be described.

14 shows a jumping unit and a jumping point.

Referring to FIG. 14, if a clip is video data corresponding to one angle among multi-angles, the clip is divided into a plurality of jumping units. The starting point of each jumping unit is the jumping point. The jumping point is a position that jumps out to a clip corresponding to a video of another angle during the playback of the clip or jumps to the clip during playback of another clip. Therefore, it is usually desirable for the jumping point to coincide with the entry point. However, since entry points exist at intervals of about 0.5 seconds, it is not preferable to use all entry points as jumping points for seamless reproduction.

15 shows a plurality of clips for multi-angle.

Referring to FIG. 15, a plurality of clips are virtually connected to each other with an equal number of jumping points. Each clip is recorded separately in a contiguous space, but connected to jumping points representing the same playback time position. Therefore, when one clip is played and another clip is played, continuous playback is possible by finishing the playing of the corresponding jumping unit and finding and playing the jumping point corresponding to the next jumping unit of the other clip. In Fig. 15, the order of playing angle 3, playing angle 1, and playing angle n again is indicated by arrows. The input to the angle change of the user is executed in units of jumping units.

An information storage medium that can be randomly accessed can be continuously reproduced by changing its position within a predetermined time even in a non-contiguous space. In the present invention, such a change of position is referred to as a jump. In general, an electronic information storage medium such as a memory does not require a jump time, but in an information storage medium such as an optical disk that reads data by moving a pickup, a certain time is required for a jump. In addition, when the speed at which video data is read from the information storage medium and the speed at which the read video data are reproduced are different, a device for compensating for the difference between the read speed and the playback speed is required even when reading and playing a continuous space. Such a device uses a video buffer. In other words, it prepares a video buffer of a certain size, reads data at a constant speed, fills the buffer, and plays the video. The data read speed is adjusted to prevent overflow or underflow of the video buffer. Using a buffer enables seamless playback even if video data is recorded at variable bit rate (VBR).

As shown in FIG. 16, the size of the jumping unit plays back one jump unit, and the data stored in the video buffer is reproduced so that the video data is played back seamlessly during the jump time even when the user jumps to a clip in which video data for another angle is stored. This buffer must be made to start the jump operation of the next angle after the jump operation ends before the underflow occurs. In case of a playback device that requires a jump time, if the worst jump time is called T_JUMP, the data read speed is V_R, and the playback speed of video data is V_O, the size of the jump unit must satisfy the following conditions.

Jump unit size> V_R * V_O * T_JUMP / (V_R-V_O)

Also, the buffer must be at least large enough to satisfy the following conditions.

Buffer size (B)> V_O * T_JUMP

17 shows a PlayList having a multi-angle structure according to the present invention.

Referring to FIG. 17, a PlayItem constituting one PlayList generally has a sequential structure, but as illustrated in the second PlayItem, when a multi-angle is formed, a plurality of PlayItems constitute an angle block. An angle block means that one PlayItem belonging to this block is played during playback. The playback object can be changed between angles of PlayItems belonging to the angle block by changing the angle during playback. PlayItems that form an angle block typically have the same playback time. In this case, the present invention is characterized in that Clips specified in PlayItems forming an angle block are separately recorded in consecutive spaces without being interleaved. That is, Clip 2, Clip3, and Clip 4 are each recorded in consecutive spaces. Therefore, these Clips are not different from other Clips which do not form an angle block. However, the clips forming the angle block have information about the jump point.

There are three preferred data structures for jump points.

18 is a first embodiment of a data structure for a jump point.

The first embodiment shown in FIG. 18 is to create and record jump point map information in addition to the general general information and the entry point map only when the clip is an angle clip. Since the jump point information is closely related to the moving picture data, it is preferable to record the jump point information in the clip information data which is additional information about the clip which is a recording unit. In General Information, the following information is recorded as main information.

version_number: Version of the clip information file.

EPMap_start_address: indicates the start address of the Entry Point Map as a relative byte number from the first byte of the clip information file.

JPMap_start_address: The jump address map start address is indicated by the relative byte number from the first byte of the clip information file. If the value of this address is 0, it is not an angle clip and there is no Jump Point Map information.

ClipInfo: stores attributes of an AV stream file associated with this clip information file.

The entry point map records time and position information of an entry point that can be randomly accessed. In the Jump Point Map, when a corresponding clip is an angle clip, information about a jump point for virtual connection with clips corresponding to different angles is recorded. As an example of the preferred embodiment, the number of jump points is recorded in the Jump Manager Information of the Jump Point Map, followed by the corresponding number of Jump Point Information. This Jump Point Information records information for finding the position of the jump point from the start of the clip. As an example of the preferred embodiment, this location information is the number of bytes, the number of sectors, or the number of MPEG-TS packets when video information is encoded in the MPEG Transport Stream.

19 is a second embodiment of a data structure for a jump point.

The second embodiment shown in FIG. 19 inserts jump point information into conventional EP Map information. This has the advantage of not requiring a separate storage space. As described above, the jump point is preferably matched with an entry point which is a random access point when video is encoded by space-time compression such as MPEG. Therefore, the information on the jump point can be simply recorded by inserting information on whether the corresponding entry point also serves as a jump point.

20 is a third embodiment of a data structure for a jump point.

The third embodiment shown in FIG. 20 collects jump point information on clips constituting an angle block to create a separate additional information structure. That is, the number of clips constituting the angle block and the number of jump points existing in one clip are recorded in Jump Manager Information, and then information about jump points for each clip is sequentially recorded. This information structure has the advantage that it is easy to find the corresponding position of each angle.

21 shows an example of PlayList information having PlayItems forming an angle block.

Referring to Fig. 21, in addition to the normal PlayItem information, each PlayItem information has angle block information. This angle block information basically contains information on whether or not the corresponding PlayItem forms an angle block. PlayItem information constituting the angle block should be recorded sequentially. Among the PlayItems constituting the PlayList, a plurality of PlayItems forming an angle block basically plays one of the PlayItems during playback. During playback, it can be changed to another PlayItem belonging to the angle block and played back.

22 shows an example in which PlayList, which is a playback unit, is configured for each angle.

Referring to FIG. 22, PlayItems belonging to PlayList do not form an angle block. Instead, each PlayList is configured to correspond to one angle. Therefore, as shown in Fig. 23, information on what angle the PlayList represents is separately recorded. The PlayList is played according to the angle selection or angle change of the user.

The recording unit of multi-angle video data is recorded separately in the continuous space of the information storage medium, and the video data representing each angle is managed as additional data using the jump point as the connection point, and the corresponding recording unit is connected. If the reproduction unit information to be reproduced is configured by adding information on the multi-angle, the reproducing apparatus that reproduces the data can reproduce the data for the multi-angle when the reproduction is performed as follows.

First, even in the case of multi-angle video data, when the angle is not changed, the data can be read and reproduced in a continuous space, so that encoding can be performed without discrimination from non-multi-angle video data. Therefore, as in the case of interleaving, separate data or encoding constraints for continuously reproducing an angle are eliminated.

In addition, since the clip, which is a recording unit, is connected with jump point information, connection information to other angle video data constituting an angle block is reproduced to the next jump point if an angle change is required at some point. The playback is performed from the video information after the jump point.

In the case where a plurality of play items belonging to a play list are recorded by forming an angle block (in the case of FIG. 21), information indicating multi-angles as an information structure of a play unit is required to change an angle while playing one play item belonging to an angle block After the playback to the jump point closest to the current position of the clip corresponding to the corresponding angle is finished, playback is performed after the corresponding jump point of the clip corresponding to the angle to be changed. When an independent play list is recorded for each angle as shown in FIG. 22, the play list is played when an angle change occurs while playing the corresponding play list.

In the case of the recording apparatus which is the object of the present invention, the above-described clip data, jump point information, and reproduction unit information are recorded on the information storage medium. Examples of preferred embodiments are as follows.

First, the jump unit size is determined in consideration of the read speed V_R of the playback device, the jump time T_JUMP time, and the highest bit rate V_O of the video data. The equation to be considered at this time has been described above. The jump unit thus determined is converted into the reproduction time. Each video data is now encoded so that a random access point is made in units greater than or equal to this playback time. At this time, the boundary position of these units becomes a jump point. In general, in a space-time compression coding method such as MPEG, a random access point becomes a starting point of a group of pictures (GOPs), and thus the jump unit will be composed of a plurality of GOPs. For each video, a jump point should be created at the same playback time.

The coded moving picture data is recorded in a continuous space of the information storage medium for each angle. The location information of the determined jump points is recorded as additional information. In this case, as an exemplary embodiment, information of corresponding jump points for each clip may be recorded in the clip information.

Next, information about the reproduction unit constituting the multi-angle is constructed and recorded. At this time, each play item corresponding to each clip is composed of a plurality of angle blocks, and then connected to form a playlist. Or create a separate playlist for each angle.

24 to 26 are reference diagrams for explaining a data structure and an apparatus thereof of an information storage medium according to another embodiment of the present invention.

According to another exemplary embodiment of the present invention, an information storage medium has a data structure in which all entry points belonging to a clip, which is a recording unit of a multi-angle video, are jumping points.

In recording the moving image data on the information storage medium, the recording apparatus records so that all entry points belonging to the clip, which is a recording unit of the multi-angle moving image, have a data structure that becomes a jumping point.

The playback device plays back a clip corresponding to one angle, and if the user wants to change the angle, the playback device plays back to the nearest entry point from the current playing position and then jumps to the corresponding entry point of the next angle clip. At this time, the entry points of all angles must designate positions within the corresponding clip in the same time zone. That is, as shown in Fig. 24, video data recorded in a physically independent space is logically connected by each entry point.

Referring to Fig. 25, an entry point is normally a recording unit having a reproduction time of 0.5 second to 1 second and exists at a position where random access is possible. If MPEG is used as the video encoding method, it consists of a plurality of GOPs. In order for all entry points of moving picture data consisting of a plurality of GOPs to be used as jumping points for changing angles, all pictures in the GOP must be closed GOPs encoded using only pictures in the corresponding GOP.

In the structure where all the entry points are jumping points, no separate information for the jumping points is needed. However, in this structure, underflow may occur in the reproducing buffer of the reproducing apparatus during the jumping for the angle change, and therefore, the jumping should not occur in a certain section after the start of reproduction or in a certain section immediately after the jumping. The section in which no jumping occurs is called No Jumping Block (NJB).

Referring to FIG. 26, an angle change is prohibited when there is less than B, which is an amount of data for seamlessly playing an image during JUMP_T, which is a jumping time when data is jumped, immediately after playback or immediately after jumping. Once playback has progressed beyond the NJB length, there is always more data than B in the buffer, which allows jumping at all entry points. The size of the NJB can be calculated similarly to the size of the JPU described above.

For a playback device that requires a jump time, if the worst jump time is called T_JUMP, the data read rate is V_R, and the playback speed of video data is V_O, the size of the NJB must satisfy the following conditions.

NJB size> V_R * V_O * T_JUMP / (V_R-V_O)

Also, the buffer must be at least large enough to satisfy the following conditions.

Buffer size (B)> V_O * T_JUMP

27 to 31 illustrate the structure and features of multi-angle video data according to the present invention. 27 to 31, it is possible to know the structure of the multi-angle video data and its features according to the present invention.

As described above, according to the present invention, by separately recording the moving picture data representing the multi-angles into the continuous space without interleaving, the recording space can be easily arranged, and the random access is possible, so that the moving picture data representing the multi-angles can be more efficiently. Can be read.

Claims (39)

In an information storage medium in which moving picture data for multi-angle is recorded, At least one clip as a recording unit for storing the video data for each angle, At least one clip for a predetermined angle is separately recorded in a continuous recording space of the information storage medium. The method of claim 1, The video data for each angle has a plurality of jump points as access points for connection playback to different angles, And additional information on which the information on the jump points is recorded. The method of claim 2, The video data includes a clip information which is additional information about the clip, and the information of the jump points is recorded in the clip information. The method of claim 3, wherein The information on the jump points is information on the position from the start position of the clip to each jump point, characterized in that they are stored in a table form in the clip information. The method of claim 3, wherein In the clip information, entry point information, which is information about randomly accessible points, is recorded, and information about the jump points is added to the entry point information to indicate whether the entry point serves as a jump point. Information storage medium, characterized in that is stored as. The method of claim 2, The information on the jump points is separately recorded in common to the clips of the angle data, and the common jump point information is stored in the form of a table in which position information about each jump point of each clip is sequentially recorded. An information storage medium, characterized in that the clip information contained in each angle block can refer to the information. The method according to any one of claims 2 to 6, Each of the jump points is an information storage medium, characterized in that the jump points are spaced and positioned so that continuous playback can be performed when the playback position is changed from the jump point to the other angle during the playback of one particular angle clip. . The method according to any one of claims 1 to 6, The play list information corresponding to each one clip and the play list information consisting of the plurality of play items are recorded as information of a reproduction unit, and the information for the plurality of angles is provided when the plurality of play items form one angle block. Information storage medium, characterized in that the information is represented as being recorded. The method according to any one of claims 1 to 6, The play list corresponding to each one clip and the play list information consisting of the plurality of play items are recorded as information of a reproduction unit, and the play list is recorded so that one play list corresponds to one angle. media. The method of claim 9, And an additional information indicating a specific angle is added to a play list recorded to correspond to each one angle as information on a plurality of angles. The method of claim 5, wherein The clip information stores entry point information, which is information about points that can be randomly accessed, and since all the entry points are the jump points at the same time, the information about the jump points is the entry point information. media. The method of claim 11, A section in which no jumping occurs immediately after playback or immediately after jumping for the clip is determined, The size of the section in which the jumping does not occur is determined that the underflow of the buffer does not occur. The method of claim 12, The clip information information storage medium, characterized in that the information about the section is determined that the jumping does not occur immediately after the playback or immediately after the jumping for the clip. A plurality of moving picture data is divided and recorded into clips, which are recording units, and the clips are recorded separately in a continuous storage space. In addition, the clip includes moving picture data corresponding to one angle when the corresponding moving picture data is multi-angle. A reproduction apparatus for reproducing an information storage medium having recorded phosphorus information, The playback device, characterized in that for multi-angle video data during playback to find the clip and to read the data in a continuous space and to play. The method of claim 14, The video data for each angle has a plurality of jump points for connection playback to different angles, and the information about these jump points is recorded in the information storage medium as additional information, and when the video data is multi-angle video data during playback, the corresponding clip If you need to play the data after reading the data in a contiguous space and change the angle, playback is performed from the corresponding jump point of the clip for the other angle data at the jump point, and the two jump points are positioned within each clip for the same playing time. And a reproduction apparatus, characterized in that the information. The method of claim 15, Each of the video data has a clip information which is additional information about a clip which is the recording unit, and the information of the jump points is recorded in the clip information. And the reproducing apparatus finds information on jump points in the clip information of the corresponding clips. The method of claim 16, The information on the jump points is information on the position from the start position of the clip to each jump point and they are stored in a table form in the clip information, and the playback apparatus is used in the table of the clips constituting the multi-angle. And a jumping point having the same information recording position is connected to each other, and finding and playing back the positions of the jumping points connected to each other when changing to another angle. The method of claim 16, In the clip information, entry point information, which is information about randomly accessible points, is recorded, and information about the jump points is added to the entry point information to indicate whether the entry point serves as a jump point. Stored as The playback apparatus assumes that jump points having the same entry point information recording positions that also function as jump points in the entry point information of the clips constituting the multi-angles are connected to each other, and that the jump points are connected to each other when the reproduction of the change to another angle is performed. A playback device, characterized in that the playback. The method of claim 15, The information about the jump points is recorded in common to the clips of the angle data, and the common jump point information is stored in a table form by sequentially recording the position information of each jump point of each clip. And a playback device that reads common jump point information common to the clips constituting the multi-angles, and searches for and plays back the positions of the jump points connected to each other when the player changes to another angle. The method of claim 15, In the clip information, entry point information, which is information about points that can be randomly accessed, is recorded. Since all the entry points are the jump points at the same time, the information about the jump points is the entry point information. And reproducing the position of jump points connected to each other when reproducing a change to another angle with reference to the entry point information. The method of claim 20, And the reproducing apparatus determines a section so that no jumping occurs immediately after or immediately after the playing with respect to the clip, and the size of the section in which the jumping does not occur determines that no underflow of the buffer occurs. The method of claim 21, And the reproducing apparatus finds out information on the section determined to prevent jumping from immediately after or immediately after the playing of the clip with reference to the clip information. The method according to any one of claims 14 to 22, Each of the jump points is set to the interval and position of the jump point so that continuous playback is possible when the playback position is changed at the jump point during the playback of the change to the other angle during the playback of one specific angle clip. Even when the angle change signal is inputted, the playback device is configured to complete the playback to the nearest jump point from the current playback position, start playback from the jump point connected to the next angle, and play back to enable continuous playback. The method according to any one of claims 14 to 22, Play list information consisting of a play item corresponding to each one clip and the plurality of play items is recorded as information of a playback unit, and the play item designates all or a part of the clip and information for a plurality of angles. As information on a plurality of play items forming one angle block is recorded, the playback apparatus plays one of the play items when the plurality of play items forming the angle block is played, A playback device characterized by playing a play item. The method according to any one of claims 14 to 22, Play list information consisting of a play item corresponding to each one clip and the plurality of play items is recorded as information of a reproduction unit, and the play item designates all or a part of the clip. The playback apparatus recorded in correspondence with one angle, wherein the playback apparatus plays back a playlist corresponding to the angle. The method of claim 25, And the play device adds information about an angle corresponding to each play list to the play list, and the reproducing apparatus reproduces a play list corresponding to the corresponding angle. A recording apparatus for recording moving picture data for multi-angle on an information storage medium having a random access function, And recording a clip, which is a recording unit of moving picture data corresponding to each angle, in a continuous space of an information storage medium, and separating the moving picture data for each angle from each other without interleaving and recording the moving picture data on the information storage medium. The method of claim 27, And a plurality of jump points for connection reproduction to different angles in addition to the video data for each angle, and recording information on the jump points as additional information on the information storage medium. The method of claim 27, And clip information, which is additional information about the clip which is the recording unit, is added to each of the moving picture data, and the information of the jump points is recorded in the information storage medium. The method of claim 29, And the information on the jump points is information on a position from the start position of the clip to each jump point and stores them in the information storage medium in the form of a table in a clip information. The method of claim 30, The clip information records entry point information, which is information about randomly accessible points, and the information on the jump points is added to the entry point information to indicate whether the entry point serves as a jump point. And a recording device. The method of claim 31, wherein In the clip information, entry point information, which is information about randomly accessible points, is recorded. Since all of the entry points are the jump points at the same time, the information about the jump points is the entry point information. A recording apparatus, characterized in that no information is recorded separately. The method of claim 32, And the recording device determines a section so that no jumping occurs immediately after the playback or immediately after the jumping with respect to the clip, and the size of the section in which the jumping does not occur determines that the underflow of the buffer does not occur. The method of claim 32, And the recording device records information in the clip information about a section in which no jumping occurs immediately after the playback or immediately after the jumping for the clip. The method of claim 28, Recording information about jump points in common to the clips of the angle data, and storing the common jump point information in a table form in which position information about each jump point of each clip is sequentially recorded. Characterized in that the recording device. The method according to any one of claims 28 to 35, Each of the jump points is recorded by setting the interval and position of the jump point so that continuous playback can be performed when the playback position is changed from the jump point to the other angle during the playback of one particular angle clip. Device. The method according to any one of claims 28 to 35, The play list information corresponding to each one clip and the play list information including the plurality of play items are added and recorded as information of a reproduction unit, and the information for the plurality of angles is for the plurality of play items forming one angle block. A recording apparatus characterized by recording as information. The method according to any one of claims 28 to 35, And the play list information consisting of the play items corresponding to the one clip and the plurality of play items is recorded as information of a reproduction unit and recorded so that one play list corresponds to one angle. The method of claim 38, And additional information representing a specific angle is added to a playlist recorded so as to correspond to each one angle as information on a plurality of angles.