JP4406467B2 - A method of reproducing moving image data for each angle corresponding to one moving image from an information recording medium. - Google Patents

Description

  The present invention relates to an information recording medium having a multi-angle data structure and an apparatus therefor.

  A typical example of a conventional information recording medium on which multi-angle data is recorded is a DVD. Multi-angle data is recorded on a DVD in an interleaving method in which data is divided and recorded alternately in a certain unit, and information for playback while tracking the interleaved block is stored in the video bitstream. Is recorded.

  The data structure of a DVD video which is a conventional multimedia playback device will be described as follows.

  FIG. 1 shows the data structure of a DVD. Referring to FIG. 1, a DVD, which is one of multimedia recording media, divides a disc into a VMG area and a plurality of VTS areas, title information and title menu information in the VMG area, and title information. Are stored in a plurality of VTS areas. Usually, the VMG area is composed of 2 to 3 files, and each VTS area is composed of 3 to 12 files.

  FIG. 2 is a diagram illustrating a data structure of the VMG area. Referring to FIG. 2, in the VMG area, a VMGI (Video Manager Information) area for storing additional information about the VMG area, a VOBS (Video Object Set) area for storing moving picture information about the menu, and a VMGI backup area There is. Each of these sections exists as one file, but the VOBS area does not necessarily have to exist, and may not be stored depending on circumstances.

  In the VTS area, information about a title that is a reproduction unit and VOBS that is moving image information are stored. A plurality of titles are recorded in one VTS.

  FIG. 3 shows the data structure of the VTS area. Referring to FIG. 3, the VTS area includes video title set information VTSI (Video Title Set Information), menu screen video data VOBS, video title set video information VOBS, and VTSI backup data. Is recorded. The presence of VOBS for displaying the menu screen is optional. Each VOBS is divided again into VOB and Cell which are recording units. One VOB is composed of a plurality of cells. Among the recording units handled in the present invention, the smallest unit is Cell.

  In DVD, playback units are hierarchized. There is a title at the top layer. A title is configured by being connected by one or a plurality of PGCs. Of the plurality of PCGs, the PGC that is played back first is called Entry PGC. It is a title made only by one PGC, that is, an Entry PGC, and is a title made by concatenating a plurality of PGCs. When the reproduction of one PGC is finished and the next PGC is reproduced, if one of several PGCs can be selected and reproduced, what PGC is selected can be stored as a command on the DVD. Controlling the playback order in this way is called navigation. The command for determining the playback order is stored in PGCI (Program Chain Information).

  FIG. 4 is a diagram illustrating a data structure of the PGC. Referring to FIG. 4, the PGC is stored with an information structure called PGCI. The PGCI includes a pre-command (Pre-command) in which navigation commands are stored, a post command (Post-command), and a plurality of program information. The pre-command is a command performed before the reproduction of the PGC, and the post command is a command performed after the reproduction of the PGC. Each program includes a plurality of cell information. This cell is connected one-to-one with the cell in the VOB which is a recording unit. Each playback unit cell has a cell command to be executed after the playback of the cell is completed. In this way, the PGCI information has an information structure in which PGCs that are playback units are hierarchically described and cells that are the lowest playback units are linked to cells that are the lowest units of the recording units.

  In particular, the PGC is made by connecting a plurality of cells as playback units. At this time, a plurality of cells can form an angle block.

  FIG. 5 is a diagram showing an angle block. As shown in FIG. 5, a plurality of cells are arranged in parallel, and a portion in which one cell is reproduced is called an angle block. The cells forming the angle block have the same reproduction time and correspond to each angle. When the cell of the playback unit forms an angle block, the angle data divided by the interleaved unit (ILVU) that is a fixed unit is interleaved between the VOB that is the recording unit and the cell that is the recording unit. Recorded.

  FIG. 6 is a diagram showing VOB and Cell, which are recording units when the multi-angle is not provided. Referring to FIG. 6, each VOB is stored in a continuous block which is a continuous recording space of the information recording medium, and is sequentially recorded. However, in the case of multi-angle, as shown in FIG. 9, each VOB corresponding to each angle and its lower unit cell are recorded in an interleaved block interleaved in ILVU units. Therefore, one angle data is not stored in a continuous recording space. Each angle data must be sequentially interleaved and recorded.

  FIG. 7 is a diagram illustrating an example in which two pieces of angle data are sequentially interleaved and recorded. Referring to FIG. 7, each ILVU must have the same playback time. The amount of data recorded varies depending on the result of compression. In order to reproduce interleaved data, it is necessary to perform jumping in units of ILVU data when reproducing one angle or changing the angle. For example, in order to reproduce angle 1 data, only ILVU data corresponding to angle 1 must be searched for and reproduced. When attempting to change the angle during playback, it is necessary to jump to a specific position corresponding to the changed angle. The jumping position at this time is also determined in units of ILVU. Thus, the position information about the ILVU followed by the angle or another angle is recorded in the moving picture bitstream. As shown in FIG. 8, the VOBS that is a moving picture bitstream has a hierarchical structure, but the lowest structure is composed of packs PACK and PCK such as NV_PCK, A_PCK, V_PCK, and SP_PCK. At this time, NV_PCK is called a navigation pack, and as shown in FIG. 9, SML_AGL_Cn_DSTA, which is the position and size information of ILVU data for nine angles, which is the maximum number supported by DVD, is recorded. . These are information for searching for the ILVU data of the angle n connected to the currently reproduced ILVU data. After the reproduction of the current ILVU data is finished, the information can be used to change to a desired angle and reproduce it. As described above, the position information of the ILVU data is multiplexed and recorded in the bit stream of the moving image data recorded by interleaving.

  FIG. 10 is a diagram illustrating jumping for playback at a selected angle in terms of cells that are in playback order.

  Referring to FIG. 8, for a seamless change in which video is reproduced without a break, even if a user's angle change command is received at a specific position, after the reproduction of the ILVU data is finished, the next of the other angles. Jump to the subsequent ILVU data and play it back.

  In order to explain the DVD authoring process for multi-angle, first, video shot at various angles is compressed to create bit stream data having the same playback length. One bit stream is configured by interleaving, and information that can refer to another angle is inserted into each bit stream, and recording is performed so that the angle can be changed during reproduction.

  First, since information about interleaving is multiplexed and recorded in the moving image data stream, this information must be separated. In general, it is possible to track and play back interleaved blocks belonging to the same angle, or change to interleaved blocks belonging to other angles to track and play back the software in the central processing unit of the playback device. Is processed as This software obtains position information about the interleaved block that is played back in conjunction with the interleaved block that is currently being played back, and transmits this to the data reader. The compressed and encoded moving image data is processed by a moving image encoder. Therefore, it is necessary to separate the position information from the moving image data and transmit it to the central processing unit.

  In addition, when multi-angle data is subdivided into a certain unit and then interleaved and stored, even when one angle is played back continuously, the data is not recorded continuously, so the data is read out. For this reason, the playback position change continues to occur. At this time, there is a problem that the bit rate of the compressed bit stream is limited in order to compensate for the case where a certain time is required for the position change like an optical disk or a hard disk.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording medium recorded with a data structure capable of random access, and an apparatus therefor, which eliminates the position restriction where multi-angle data is stored.

  Another object to be solved by the present invention is to provide an information recording medium in which information about jump points necessary for continuous playback and angle change of multi-angle data is recorded separately from moving image data and an apparatus therefor. It is.

  Still another object to be solved by the present invention is that information on jump points necessary for continuous reproduction and angle change of multi-angle data is recorded in combination with information for random access supported by moving image data. An information recording medium and an apparatus therefor are provided.

  According to the present invention, in the information recording medium on which moving image data for multi-angles is recorded according to the present invention, the moving image data for each angle is interleaved with each other, and is continuous with moving image data for other angles. Information recording medium comprising: moving image data of different angles having a plurality of access points to be reproduced automatically; the interleaved moving image data area; and information on the access points recorded in a separate area Achieved by:

  The access point may correspond to an ILVU boundary of the interleaved moving image data.

  Preferably, characteristic information corresponding to the moving image data for the other angle is further included, and the characteristic information includes information on the access point.

  On the other hand, according to another field of the present invention, the object is to record moving image data for each angle that is divided into ILVUs and interleaved with each other in an information recording medium that records moving image data for multiple angles. Information for accessing the next ILVU of the video data for the angle from the ILVU of the video data for one angle and / or for the other angle from the ILVU of the video data for one angle The information recording medium includes information for accessing a next ILVU corresponding to the moving image data, and the information for accessing is recorded in a separate area from the interleaved moving image data. Is done.

  It is preferable that characteristic information corresponding to moving image data for each angle is included, and the characteristic information includes information on the access point.

  Meanwhile, according to another field of the present invention, the object is to record moving image data for multi-angle corresponding to one moving image, and the moving image data for each angle are interleaved with each other. A clip AV (Audio-Video) stream corresponding to moving image data for each angle, and information about a jump point of the clip AV stream, the jump point being the clip AV that has been interleaved This is achieved by an information recording medium characterized by being an access point that is stored in a stream area and a separate area and is reproduced from one angle to another angle.

  The jump point may correspond to a boundary that defines a unit of the interleaved clip AV stream.

  It is preferable that the clip information further includes a plurality of clip information corresponding to the clip AV stream, and the clip information includes information on the jump point.

  Each clip information includes an entry point map, and the clip information includes information on an entry point corresponding to one of the clip AV streams that can be randomly accessed, and each entry point is a jump point. It is desirable to include information about whether or not.

  It is preferable that playlist information is further included, and the playlist information includes at least one play item corresponding to the clip AV stream.

  Further including playlist information, wherein the playlist information includes at least one play item having angle block information, wherein the angle block information is for video data for each angle. It is desirable to be information about whether or not.

  Preferably, the angle block information includes information about the number of different angles for the moving image data.

  On the other hand, according to another field of the present invention, the object is to provide a moving image for each angle interleaved in an information recording medium on which moving image data for a multi-angle corresponding to one moving image is recorded. A clip AV stream corresponding to the data, and information about a jump point of the clip AV stream, and the jump point is an access point that causes video data to be reproduced from one angle to another angle This is achieved by a featured information recording medium.

  It is preferable that clip information corresponding to the clip AV stream is further included, and the clip information includes information on the jump point.

  The information on the jump point preferably includes position information corresponding to the start position of each jump point for the clip AV stream.

  On the other hand, according to another field of the present invention, the object is to provide moving image data for each angle interleaved with each other in an information recording medium on which moving image data for multi-angle corresponding to one moving image is recorded. , A plurality of clip information corresponding to the clip AV stream recorded in a separate area, and each clip information is for random access And an entry point map containing information about whether each entry point is a jump point, and the jump point is an access for reproducing the video data from one angle to another angle. It is achieved by an information recording medium, which is a point.

  On the other hand, according to another field of the present invention, the object is to record moving image data for multi-angles on an information recording medium, wherein moving image data for each angle is continuously connected to other angles. A recording unit having a plurality of access points to be reproduced and recording moving image data for each angle on the information recording medium; and information about the access points on the interleaved moving image on the information recording medium This is achieved by a recording apparatus comprising: a control unit that controls the recording unit so as to record data and a separate area.

  The control unit may control the recording unit so that information about the access point is recorded as part of characteristic information corresponding to moving image data for each angle.

  On the other hand, according to another field of the present invention, the object is to record moving image data for each angle interleaved with each other in an ILVU in an apparatus for recording moving image data for a multi-angle on an information recording medium. From the ILVU of the video data for one angle and the information for accessing the next ILVU of the video data for the angle and / or from the ILVU of the video data for one angle Further, interleaved moving image data and information for accessing the next ILVU corresponding to moving image data for another angle and a control unit for controlling the recording unit to record the information on a separate area of the information recording medium are provided. This is achieved by a recording device characterized by including.

  On the other hand, according to another field of the present invention, the object is to support moving image data for each angle in an apparatus for recording moving image data for multi-angle corresponding to one moving image on an information recording medium, A recording unit that records interleaved clip AV streams on an information recording medium, and jump point information of the clip AV stream is recorded on an area of the information recording medium that is separate from the interleaved clip AV stream. And a control unit for controlling the recording unit, wherein the jump point is an access point for reproducing moving image data from one angle to another angle.

  The control unit may control the recording unit so that information about the jump point is recorded as part of clip information corresponding to the clip AV stream.

  On the other hand, according to another field of the present invention, the object is to record moving images for angles interleaved with each other in an apparatus for recording moving image data for multi-angles corresponding to one moving image on an information recording medium. A recording unit that records a clip AV stream corresponding to data on the information recording medium, and a recording unit that records information about a jump point of the clip AV stream in an area of the clip AV stream and a separate information recording medium And the jump point is achieved by a recording device characterized in that the jump point is an access point for reproducing moving image data from one angle to another angle.

  On the other hand, according to another field of the present invention, the object is to support moving image data for each angle in an apparatus for recording moving image data for multi-angle corresponding to one moving image on an information recording medium, A recording unit that records interleaved clip AV streams on the information recording medium, and a plurality of clip information corresponding to the clip AV streams in an area of the information recording medium separate from the interleaved clip AV stream A controller that controls the recording unit to record, each clip information includes information about an entry point for random access and information about whether each entry point is a jump point. Including an entry point map including Catcher pump point is achieved by a recording apparatus characterized by an access point to be played to yet another angle video data from one angle.

  On the other hand, according to another field of the present invention, the object is to reproduce a moving image data for each angle from an information recording medium and continuously reproduce the moving image data linked to each angle. A reading unit for reading moving image data for each angle interleaved with each other, and the interleaving moving image data and the access point recorded in a separate information recording medium area And a reproducing unit that reproduces the moving image data for each angle according to the information.

  On the other hand, according to another field of the present invention, the object is to reproduce the moving image data for each angle from the information recording medium, and for the moving image for each angle divided into ILVUs and interleaved with each other. Based on information about the reading unit for reading data from the information recording medium, the interleaved moving picture data, and the access point recorded in the area of the separate information recording medium, the moving picture data for each angle is obtained. The information about the access point is information for accessing the next ILVU of the video data for the angle from the ILVU of the video data for the angle, and / or Corresponding video data for other angles from ILVU of video data for angles It is achieved by reproducing apparatus which comprises information for accessing the ILVU of.

  On the other hand, according to another field of the present invention, the object is to play back moving image data for each angle corresponding to one moving image from an information recording medium, corresponding to the moving image data for each angle, The reading unit for reading clip AV streams interleaved with each other from the information recording medium, and the jump AV information of the clip AV stream recorded in the area of the interleaved clip AV stream and a separate information recording medium And a playback unit that plays back a clip AV stream, wherein the jump point is an access point that plays back moving image data from one angle to another angle.

  On the other hand, according to another field of the present invention, the object is to reproduce moving image data for each angle interleaved with each other in an apparatus for reproducing moving image data for each angle corresponding to one moving image from an information recording medium. A reading unit that reads a clip AV stream corresponding to data from the information recording medium, and the clip AV stream according to information about a jump point of the clip AV stream recorded in an area of the clip AV stream and a separate information recording medium The jump point is achieved by a playback device that is an access point for playing back moving image data from one angle to another angle.

  On the other hand, according to another field of the present invention, the object is to reproduce moving image data for multi-angle corresponding to one moving image from an information recording medium, corresponding to moving image data for each angle, A reading unit for reading clip AV streams interleaved with each other from the information recording medium, and a plurality of clips AV streams corresponding to the clip AV streams recorded in an area of the interleaved clip AV stream and a separate information recording medium A playback unit that plays back the clip AV stream according to clip information, wherein each piece of clip information includes information about an entry point for random access and information about whether or not each entry point is a jump point. Including entry points Includes a map, the jump point is achieved by reproducing apparatus, characterized in that the access point to be played to yet another angle video data from one angle.

  On the other hand, according to another field of the present invention, the object is a method of recording moving image data for multi-angles on an information recording medium, wherein moving image data for each angle is continuously connected to other angles. A plurality of access points to be played back, and recording moving image data for each angle on the information recording medium; and information about the access points on the interleaved moving image data on the information recording medium And a step of recording in a region of a separate information recording medium.

  Preferably, the step of recording the access point includes a step of recording characteristic information corresponding to moving image data for each angle, and the characteristic information includes information about the access point.

  On the other hand, according to another field of the present invention, the object of the present invention is to provide a method of recording moving image data for multi-angles on an information recording medium. And from the ILVU of the video data for one angle to the next ILVU of the video data for the angle, and / or from the ILVU of the video data for one angle And recording the information for accessing the next ILVU corresponding to the video data for another angle in the interleaved video data and a separate area of the information recording medium. Is done.

  On the other hand, according to another field of the present invention, the object of the present invention is a method of recording moving image data for multi-angle corresponding to one moving image on an information recording medium, corresponding to moving image data for each angle, Recording a clip AV stream interleaved with each other on an information recording medium, and recording jump point information of the clip AV stream on an area of the interleaved clip AV stream and a separate information recording medium. The jump point is achieved by a recording method that is an access point for reproducing moving image data from one angle to another angle.

  Preferably, the step of recording information about the jump point includes a step of recording clip information corresponding to the clip AV stream, and the clip information includes information about the jump point.

  On the other hand, according to another field of the present invention, the object is to use a method for recording moving image data for multi-angle corresponding to one moving image on an information recording medium. Recording a clip AV stream corresponding to data on the information recording medium, and recording information about a jump point of the clip AV stream in an area of the clip AV stream and a separate information recording medium, The jump point is achieved by a recording method which is an access point for reproducing moving image data from one angle to another angle.

  On the other hand, according to another field of the present invention, the object of the present invention is a method of recording moving image data for multi-angle corresponding to one moving image on an information recording medium, corresponding to moving image data for each angle, Recording a clip AV stream interleaved with each other on the information recording medium, and recording a plurality of clip information corresponding to the clip AV stream in an area of the interleaved clip AV stream and a separate information recording medium Each clip information includes an entry point map including information on entry points for random access and information on whether or not each entry point is a jump point. , Video It is achieved by a recording method which is a access point to further play another angle a over data from one angle.

  On the other hand, according to another field of the present invention, the object of the present invention is a method of reproducing moving image data for each angle from an information recording medium. Reading the moving image data for each angle interleaved with each other, and the information on the access point recorded in the area of the interleaved moving image data and a separate information recording medium And a step of reproducing moving image data for each angle.

  On the other hand, according to another field of the present invention, the object is to reproduce moving image data for each angle from an information recording medium, in which the moving image for each angle is divided into ILVUs and interleaved with each other. Reading data from the information recording medium, and reproducing the moving picture data for each angle based on the interleaved moving picture data and information about the access point recorded in a separate information recording medium area And the information about the access point includes information for accessing the next ILVU of the video data for the angle from the ILVU of the video data for the angle and / or the video for the angle. Corresponding next of video data for further angles from data ILVU It is achieved by reproducing method characterized by comprising the information for accessing the ILVU.

  On the other hand, according to another field of the present invention, the object is a method of reproducing moving image data for each angle corresponding to one moving image from an information recording medium, corresponding to the moving image data for each angle, The steps of reading the clip AV streams interleaved with each other from the information recording medium, and the clip AV stream by jump point information of the clip AV stream recorded in the area of the interleaved clip AV stream and a separate information recording medium. And a step of reproducing an AV stream, wherein the jump point is an access point for reproducing moving image data from one angle to another angle.

  On the other hand, according to another field of the present invention, the object is to reproduce moving image data for each angle corresponding to one moving image from an information recording medium. A step of reading a clip AV stream corresponding to data from the information recording medium, and information about a jump point of the clip AV stream recorded in an area of the clip AV stream and a separate information recording medium. The jump point is achieved by a playback method characterized in that the jump point is an access point for playing back moving image data from one angle to another angle.

  On the other hand, according to another field of the present invention, the object is to reproduce moving image data for multiple angles corresponding to one moving image from an information recording medium, corresponding to moving image data for each angle, A step of reading a clip AV stream interleaved with each other from the information recording medium, and a plurality of clips corresponding to the clip AV stream recorded in an area of the interleaved clip AV stream and a separate information recording medium Playing back the clip AV stream according to information, wherein each piece of clip information includes information about an entry point for random access and information about whether or not each entry point is a jump point. Includes a map, the jump point is achieved by reproducing method which is a access point to be reproduced to yet another angle video data from one angle.

  The present invention can provide an information recording medium recorded with a data structure in which multi-angle data is stored and a data structure in which random access is possible, and an apparatus therefor.

  The present invention can provide an information recording medium in which information about jump points necessary for continuous reproduction and angle change of multi-angle data is recorded separately from moving image data and an apparatus therefor.

  The present invention provides an information recording medium in which information on jump points necessary for continuous playback and angle change of multi-angle data is recorded in combination with information for random access supported by moving image data, and an apparatus therefor be able to.

  The present invention records moving image data for multi-angle data, and records information about jump points for reproducing each angle data in a separate space to implement the multi-angle. At this time, the moving image data is composed of moving image data for one angle as a recording unit clip, and each clip is divided into smaller interleaved blocks for interleaving, or by a separate recording method that is not an interleaving method. Each angle data is recorded to realize multi-angle. That is, moving image data forming each angle and jump point information for tracking the angle are recorded in a space separate from the moving image data. In order to change to another angle, each angle data is divided by a jumping unit (JPU: Jumping Unit), the jumping unit start address is designated as a jumping point, and a jumping point for each angle data is added separately. Record as information. At this time, when the angle data is divided into interleaved blocks and interleaved with other angle data, the jumping unit has the same meaning as the interleaved block.

The components of the present invention for this purpose are listed as follows.
1) AV stream (clip) encoded for each angle
2) A clip information file 3) having the encoding attribute information of the AV stream 3) A play item 4) in which a time is specified based on a playback section of IN_time and OUT_time based on a playback section of IN_time and OUT_time 5) A playlist consisting of one or more play items 5) Jumping point map in which jumping point positions are recorded in a table. In the present invention, multi-angle refers to a plurality of moving image data corresponding to a specific time. This means that it is composed of playback units. In other words, data taken simultaneously by several cameras is made into a moving image. The audio data is generally the same, but can be configured differently for each angle. In summary, moving image data reproduced in the same time band is called multi-angle data, and content produced in this way is called multi-angle content.

  The moving image data is stored in a large amount and is stored or transmitted as a compressed bit stream after being compressed. In the present invention, the term “clip” is used as a recording unit, and the terms “play list” and “play item” are used as playback units. At this time, Clip corresponds to Cell, which is a recording unit on DVD, and PlayList and PlayItem have the same concept as programs and cells, which are playback units on DVD.

  That is, an AV stream is recorded in Clip units on the information recording medium according to the present invention. In a normal case, the Clip is divided into interleaved blocks and interleaved, or is recorded in a continuous space for each clip. The AV stream is compressed and recorded in order to reduce the capacity. In order to play back the recorded clip, it is necessary to know the characteristic information of the compressed moving image data. Therefore, Clip Information is recorded for each Clip. In Clip Information, an Entry Point Map is recorded in which audio and video attributes of each clip and position information of an Entry Point that can be randomly accessed in a certain section unit are recorded. In the case of MPEG (Motion Picture Expert Group), which is often used in moving image compression technology, Entry Point is the position of an I picture for compressing intra video. The Entry Point Map is mainly used for a time search for searching for a point where a certain amount of time has elapsed after the start of reproduction.

  FIG. 11 is a diagram illustrating a relationship between a jumping unit, a jumping point, and the Entry Point. That is, if one clip is moving image 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 a jumping point. The jumping point is a position to jump out to a clip corresponding to a moving image of another angle during reproduction of the clip, or to jump in to the clip during reproduction of another clip. Therefore, in general, it is desirable that the jumping point coincides with the Entry Point. However, since the Entry Point exists every time interval of about 0.5 seconds, it is not desirable to use all Entry Points as jumping points for seamless reproduction. That is, it is desirable that one jump unit has a plurality of Entry Points, and the jump point preferably points to the same point as the first entry point.

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

  FIG. 12 is a diagram illustrating a situation in which a plurality of clips for multi-angle are recorded in independent spaces without being interleaved. Referring to FIG. 12, a plurality of clips are virtually connected to each other with an equal number of jumping points. Each clip is recorded separately in a continuous space, but is connected to jumping points representing the same playback time position. Therefore, when playing another clip while playing one clip, finish playing the jumping unit, and search for and play the jumping point corresponding to the next jumping unit of the other clip. Continuous playback is possible. In FIG. 12, the order in which the angle 1 is reproduced while the angle 3 is reproduced and the angle n is reproduced again is indicated by arrows. The input for changing the user's angle is executed in units of jumping units.

  As shown in FIG. 13, if a clip of one angle data is divided into small ILVUs and interleaved with other angle data, the jump unit becomes ILVU, and the start of each ILVU is a jump point. However, it becomes the first entry point belonging to the ILVU. One ILVU can have a plurality of entry points. In this case, even when one angle is reproduced, a jump occurs at the jump point. That is, the ILVU belonging to the angle must be searched and reproduced. After all the current ILVUs have been reproduced, the position of the unit must be searched for the reproduction of the next ILVU belonging to the same angle. At this time, jump point information is used. Also, jump point information is used to find the position of the unit of the changed angle when the angle is changed.

  FIG. 14 is a diagram illustrating the correlation among PlayList, PlayItem, Clip Information, and Clip. Referring to FIG. 14, PlayList is a basic playback unit. The information recording medium according to the present invention stores a plurality of PlayLists. One PlayList is formed by connecting a plurality of PlayItems. The PlayItem corresponds to a part of the Clip, and specifically, is used in the form of designating the playback start time and end time within the Clip. Therefore, using Clip Information, the position of the part in the actual Clip is found.

  An information recording medium capable of random access can be continuously reproduced by changing the position within a certain time even when it is not a continuous space. In the present invention, such a position change is expressed as a jump. Usually, an electronic information recording medium such as a memory does not require a jump time. However, in the case of an information recording medium that reads data by moving a pickup, such as an optical disk, a certain time is required for the jump. is required. Further, when the speed at which moving image data is read from the information recording medium is different from the speed at which the read moving image data is reproduced, even when the continuous space is read and reproduced, the difference between the reading speed and the reproduction speed is compensated. Equipment is needed. A moving image buffer is used as such a device. That is, a moving image buffer of a certain size is prepared, data is read out at a constant speed, and the buffer is filled, and then reproduced. The data reading speed is adjusted so as to prevent overflow and underflow of the moving image buffer. If a buffer is used, even if moving image data is recorded at a variable bit rate (VBR), it is possible to reproduce without interruption.

  As shown in FIG. 15, the size of the jumping unit is such that even if one jump unit is played and a jump is made to a clip in which movie data for another angle is stored, the movie data is not broken during the jump time. The data stored in the moving image buffer is played back so that it can be played back, and the jump operation must be finished before the buffer is underflowed, and playback of the jump unit of the next angle must be started. In the case of a playback device that requires a jump time, the worst jump time is called T_JUMP, the data reading speed is V_R, and the playback speed of moving image data is V_O. The size of the jump unit must satisfy the following conditions: Don't be.

Jump unit size> V_R * V_O * T_JUMP / (V_R-V_O)
Also, the buffer must be large enough to satisfy at least the following conditions:

Buffer size (B)> V_O * T_JUMP
FIG. 16 is a diagram illustrating an example of a PlayList having a multi-angle structure according to the present invention. Referring to FIG. 16, a PlayItem that constitutes one PlayList usually has a sequential structure. However, as illustrated in the second PlayItem, when a multi-angle is formed, a plurality of PlayItems are included. Configure the angle block. An angle block means that one PlayItem belonging to this block is played back during playback. During each PlayItem belonging to an angle block, the playback target is changed by changing the angle during playback. The PlayItems that form an angle block usually have the same playback time. At this time, the present invention is characterized in that the Clip specified in the PlayItem forming the angle block has information about the jump point in a space separate from the moving image data as additional information. Clips that are moving image data may be interleaved with each other or may not be interleaved and may be recorded separately in a continuous space. In the case of interleaving, each clip is divided into ILVUs which are smaller units and interleaved with other angle clips. When interleaving is not performed, Clip 2, Clip 3, and Clip 4 are recorded in continuous spaces. Therefore, these Clips are not different from other Clips not forming an angle block.

  There are three desirable data structures for jump points:

  FIG. 17 is a first embodiment of a data structure for jump points. In the first embodiment shown in FIG. 17, the Jump Point Map (JP Map) is added to the Clip Information in addition to the conventional General Information (Entry Map) and the Entry Point Map (EP Map) only when the Clip is an angle clip. ) Creating and recording information. The jump point information is recorded in a separate space separately from the moving image data, and since it has a close relationship with the moving image data, it is recorded in Clip Information Data, which is additional information about the clip that is a recording unit. It is desirable to do. In General Information, the following information is recorded as main information.

  Version_number: version of the clip information file.

  -EPMap_start_address: The start point of the Entry Point Map, which is a relative byte number from the first byte of the clip information file.

  -JPMap_start_address: indicates the start address of Jump Point Map as a relative byte number from the first byte of the clip information file. When the value of this address is 0, it is not an angle clip, and there is no Jump Point Map information.

  ClipInfo: saves the attribute of the AV stream file associated with this clip information file.

  In the Entry Point Map, time and position information of the Entry Point that can be randomly accessed is recorded. In general, the playback time is a presentation time defined by MPEG, and the position information is a byte number, a sector number, or moving image information is encoded with MPEG Transport Stream as a preferred embodiment. In this case, it is the number of MPEG-TS packets. In the Jump Point Map, when the Clip is a clip for an angle, information on a jump point for virtual connection with a Clip corresponding to another angle is recorded. As a desirable embodiment, the number of jump points is recorded in the Jump Manager Information of the Jump Point Map, and then the Jump Point Information of the number is recorded. In this Jump Point Information, information for searching for the position of the jump point from the start position of the clip is recorded. As a preferred embodiment, this position information is the number of bytes, the number of sectors, or the number of MPEG-TS packets when moving picture information is encoded with MPEG Transport Stream.

  FIG. 18 is a second embodiment of the data structure for jump points. The second embodiment shown in FIG. 18 is to insert jump point information into conventional EP Map information. As described above, it is desirable to match the jump point with the Entry Point, which is a random access point, when a moving image is encoded by performing visual space compression as in MPEG. Therefore, by inserting information about whether or not the Entry Point also serves as a jump point into information about each Entry Point, information about the jump point can be easily recorded.

  FIG. 19 is a third embodiment of the data structure for jump points. The third embodiment shown in FIG. 19 is to collect jump point information about Clips forming an angle block and create a separate additional information structure. That is, after the number of clips forming an angle block and the number of jump points existing in one clip are recorded in Jump Manager Information, information on each clip jump point is sequentially recorded. This information structure has the advantage that the position of each angle can be easily found.

  FIG. 20 is a diagram illustrating an example of PlayList information having a PlayItem that forms an angle block. Referring to FIG. 20, in addition to the normal PlayItem information, each PlayItem information has angle block information. The angle block information basically includes information on whether or not the PlayItem is an angle block. PlayItem information forming an angle block must be recorded sequentially. Among the PlayItems constituting the PlayList, a plurality of PlayItems forming an angle block are basically reproduced at the time of reproduction. During playback, playback can be changed to another PlayItem belonging to the angle block.

  FIG. 21 is a diagram illustrating an example in which a PlayList that is a reproduction unit is configured for each angle. Referring to FIG. 21, PlayItem belonging to PlayList does not form an angle block. Instead, each PlayList is configured corresponding to one angle. Therefore, as shown in FIG. 21, information about what angle the PlayList represents is recorded separately. The PlayList is reproduced by the user's angle selection or angle change.

  As described above, the recording unit of the moving image data forming the multi-angle is interleaved on the information recording medium or is separated and recorded in the continuous space, and the connection position of the moving image data representing each angle is used as a jump point. If the playback unit information is managed as additional data in a separate area from the moving image data, and the playback unit information to be played back by connecting the recording units is added with information about the multi-angle, If the reproduction is performed as described above, the data on the multi-angle can be reproduced.

  Since information about the jump point for tracking and reproducing the angle data is recorded in a separate space from the moving image data, the information about the jump point is read from the information recording medium and stored in the memory before starting the reproduction of the moving image. After saving, the same angle data is tracked and played back, or played back in response to a user angle change. The clip for each recording unit is added with the link information to the video data for other angles forming the angle block as jump point information, so if you need to change the angle at any point, the next jump After playback to the point, playback may be performed from the video information after the jump point of the video data to be changed.

  In addition, when each angle is recorded in a continuous space without being interleaved, even if the angle change is not made as multi-angle video data, the data can be read and reproduced in the continuous space. Encoding is possible without discrimination from non-multi-angle video data. Therefore, as in the case of interleaving, there is no additional data or encoding restrictions for continuously reproducing one angle.

  When a plurality of play items belonging to a play list are recorded as an angle block (in the case of FIG. 19), information indicating multi-angle display as an information structure of a playback unit is recorded while playing one play item belonging to the angle block. When it is necessary to change the angle, after the reproduction to the jump point closest to the current position of the clip corresponding to the angle is finished, the reproduction is performed from the next of the jump point of the clip corresponding to the angle to be changed. As shown in FIG. 21, when an independent playlist is recorded for each angle, when an angle change occurs during reproduction of the playlist, the playlist is reproduced.

  In the case of the recording apparatus that is the subject of the present invention, the above-described clip data, jump point information, and reproduction unit information are recorded on an information recording medium. A desirable embodiment is as follows.

  First, the jump unit size is determined in consideration of the reading speed V_R of the playback device, the jump time T_JUMP time, and the maximum bit rate V_O of moving image data. At this time, the expressions to be considered are described above. The jump unit determined in this way is converted into a reproduction time. Next, each moving image data is encoded so that a random access point is made in the same unit as that of the reproduction time. At this time, the boundary position of this unit becomes a jump point. Generally, in a space-time compression encoding method such as MPEG, a random access point is a start point of a GOP (Group Of Picture), and thus the jump unit is composed of a plurality of GOPs. For each video, jump points must be created in the same playback time zone.

  The encoded moving image data is interleaved with the jump unit as ILVU, or is recorded in a continuous space of the information recording medium for each angle. At this time, the position information of the determined jump point is recorded as additional information. As a preferred embodiment, information on the jump point can be recorded in clip information for each clip.

  The information about the playback unit constituting the next multi-angle is configured and recorded. At this time, after forming a plurality of play items corresponding to each clip and configuring them with angle blocks, these are connected to create a playlist. Or create an independent playlist for each angle.

  According to the present invention described above, moving image data representing multi-angle and jump point data are recorded in a separate space. Video data can be easily arranged in a recording space by interleaving or recording separately in a continuous space without interleaving, making random access possible and more efficient video data representing multiple angles. Can be read automatically.

It is a data structure figure of DVD. It is a data structure figure of a VMG area | region. It is a data structure figure of a VTS area. It is a data structure figure of PGC. It is a block diagram of an angle block. It is a structural diagram of VOB and Cell which are recording units when not having a multi-angle. In this example, two pieces of angle data are sequentially interleaved and recorded. It is a detailed hierarchy figure of a moving image bit stream. It is an information structure diagram for reproducing a multi-angle recorded in NV_PCK. It is a reference figure which shows the jumping for reproducing | regenerating in the selected angle from the standpoint of the cell which is a reproduction | regeneration order. It is a relationship diagram of a jumping unit, a jumping point, and an entry point. It is a structural diagram of a method in which each clip is recorded in a continuous space. It is a structural diagram of a method in which each clip is recorded by interleaving. It is a reference figure which shows the correlation of PlayList, PlayItem, ClipInformation, Clip. It is a relationship diagram between a jump operation for reproducing moving image data without interruption and a buffer. 3 is a structural example of a PlayList having a multi-angle structure according to the present invention. It is 1st Embodiment of the data structure with respect to a jump point. It is 2nd Embodiment of the data structure with respect to a jump point. It is 3rd Embodiment of the data structure with respect to a jump point. It is an example of PlayList information which has PlayItem which makes an angle block. This is an example in which PlayList, which is a playback unit, is configured for each angle. It is a structure diagram of information recorded separately about what angle the PlayList represents.

Claims (2)

In a method of reproducing moving image data for each angle corresponding to one moving image from an information recording medium,
Reading clip AV streams corresponding to video data for each angle and interleaved with each other from the information recording medium;
Playing back the clip AV stream with a plurality of clip information corresponding to the clip AV stream recorded in an area of the interleaved clip AV stream and a separate information recording medium, and each clip information Includes an entry point map, and the clip information includes information on entry points that can be randomly accessed and information on whether or not each entry point is an angle change point. , The point of playing a video from one angle to another,
When the entry point is an angle change point using the information about the entry point and information about whether each entry point is an angle change point, the clip AV stream is reproduced. A reproduction method comprising jumping from one angle to another angle at the entry point of the stream.   The reproduction method according to claim 1, wherein the information about the entry point includes position information about the entry point between AV streams.

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