CN100498958C - Information storage medium with data structure for multi-angle and device thereof - Google Patents

Abstract

An information storage medium controls a multi-angle data reproducing apparatus by having a data structure including at least one clip for each angle, each angle clip being a data recording unit of multi-angle data for an angle. Each angle clip is divided into predetermined jumping units at jumping points and each is recorded in contiguous areas of the information storage medium. Using the clip jumping points as links between angle clips in which each angle clip is adjacently recorded provides efficient random access for reading multi-angle data for angle change.

Description

Information storage medium with data structure for multi-angle and device thereof

technical field

The present invention relates to an information storage medium having a structure for multi-angle data and a recording and reproducing apparatus thereof.

Background technique

A digital versatile disc (DVD) is a representative example of a conventional information storage medium on which multi-angle data can be recorded. Multi-angle data is recorded on a DVD by using an interleaving method in which data is divided into predetermined units and the units are alternately recorded.

Hereinafter, a video (including audio, as the case may be) data structure of a DVD as a conventional multimedia storage medium will be described with reference to the accompanying drawings. FIG. 1 is a diagram of a conventional DVD data structure. Referring to FIG. 1, a DVD is divided into a Video Manager (VMG) area and a plurality of Video Title Set (VTS) areas. Information on video titles (ie, video title related data) and menu information for video titles are stored in the VMG area, and video title data are stored in a plurality of VTS areas. Usually, a VMG area includes two or three files, and each VTS area includes three to twelve files.

Fig. 2 is a data structure of a traditional VMG area. 2, the VMG area includes: a Video Manager Information (VMGI) area containing additional information on the VMG area, a Video Object Set (VOBS) area containing video object information on a video title menu, and a VMGI backup area. Each of the VMGI area, VOBS area, and VMGI backup area exists as a file. However, inclusion of the VOBS area in the VMG area is optional, so that the VOBS area may not be formed in the VMG area in some cases.

Each VTS area contains title data as a playback unit, and video object information VOBS. A plurality of titles can be recorded on the VTS area. FIG. 3 is a diagram of a data structure of a conventional VTS area. Referring to FIG. 3, video title set information (VTSI), VOBS of the video title menu screen, VOBS of the video title set, and VTSI backup data are recorded in the VTS area. For displaying the title menu screen, recording of the video title menu screen VOBS is optional. Each video title set VOBS is divided into a plurality of video object VOBs as data recording units, and each VOB includes a cell as the minimum unit of a title's VOB (ie, data unit). Therefore, a VOB or a data recording unit includes a plurality of primitives as the most basic unit of a data recording unit.

In DVD, playback units are recorded in a hierarchical structure. Titles (ie, data records) are formed at the uppermost level of the hierarchical structure. Typically, a title (ie a data record of a title) is linked to at least one program chain (PGC). A PGC that is reproduced first among a plurality of PGCs is called an entry PGC. FIG. 4 is a diagram showing a title linked to a first PGC, ie, an entry PGC, according to a conventional multi-angle data recording method. FIG. 5 is a diagram showing titles linked to a plurality of PGCs according to a conventional multi-angle data recording method. When one of a plurality of PGCs is selected and reproduced after one PGC is reproduced as shown in FIG. 5, a command for determining a PGC to be selected and reproduced may be stored in the DVD. The order in which the control is reproduced is called navigation. Commands for determining navigation are included in program chain information (PGCI).

FIG. 6 is a diagram of a PGC when linked to title data recording according to a conventional multi-angle data recording and reproducing method. Referring to FIG. 6, the PGC includes PGC information (PGCI) and a video title set VOBS including title data records. The PGCI contains a pre-command (pre-command) including a navigation command, a post-command (post-command), and a plurality of program information. The pre-command is executed before reproducing the PGC, and the post-command is executed after the reproducing. Each PGCI program contains a plurality of primitive information, and each program primitive is a reproduction unit. Primitives included in a program (ie, PGCI program primitives) are linked to primitives included in VOBs of a video title set VOBS, each VOB primitive being a unit of data recording. Each program cell, that is, a reproduction unit, has a cell command (cc) provided after its reproduction. PGCI is a part of hierarchical description of PGC as a reproduction unit, and PGC has an information structure linking PGCI program primitive as the most basic reproduction unit to VOB primitive as the most basic data recording unit. Specifically, a PGC is a link of a plurality of PGCI program primitives as a reproduction unit. Here, the plurality of PGCI program primitives may form an angle block.

FIG. 7 is a diagram of a data structure of a conventional angle block. Referring to FIG. 7, an angle block is constructed in such a way that a plurality of rendering primitives are arranged in parallel so that only one of these primitives can be rendered. The rendering primitives forming an angle block have the same rendering time. Each of the rendering primitives corresponds to a specific angle. If a cell as a reproduction unit forms an angle block, data of a specific angle is divided into predetermined interleave units (ILVU) by using an interleaving method and recorded on a VOB including the cell as a data recording unit.

FIG. 8 is a diagram of a data structure of a conventional video title set VOB and primitives in which multi-angle support is not applied. Referring to FIG. 8, VOBs are sequentially stored and recorded in adjacent blocks of an information storage medium, which are adjacent recording spaces. However, as shown in FIG. 9, when multi-angle support is applied, VOBs of each angle and its primitives are recorded in ILVUs on interleaved blocks by using an interleave method. As a result, data of a specific angle is not recorded on the adjacent recording area. That is, generally, angle data is sequentially recorded on alternate VOBs by using an interleaving method.

More specifically, FIG. 9 is a conventional data structure of two angle data recorded sequentially and alternately using an interleave method. Referring to FIG. 9, each ILVU has the same reproduction time. The amount of data to be recorded may vary depending on the type of compression method used. In the case of interleaved data, in order to reproduce data of one angle or data of a changed angle, it is necessary to jump to a desired ILVU. For example, in order to reproduce the data at the first angle, it is necessary to detect the data for the first angle in ILVU. For this first angle data detection, the video object bitstream contains ILVU location data (ie, NXT_ILVU_SA and NXT_ILVU_SZ as in the data structure shown in FIG. 11 ). The ILVU position data indicates the position and size of the next ILVU data belonging to the bitstream. After reproducing ILVU data, use NXT_ILVU_SA and NXT_ILVU_SZ to jump to the next ILVU data.

In order to change the angle during data reproduction, it is necessary to jump to the position of the data for the changed angle. The extent of the jump is determined in ILVU. FIG. 10 is a diagram representing reproduction of ILVU data jumping to an angle for selection in view of a primitive according to conventional multi-angle data. Referring to FIG. 10, even if a user issues a command to change an angle sometime during reproduction of ILVU data, subsequent image data may be reproduced without pause for seamless change. This is achieved by first completing the rendering of the ILVU data, following the link by jumping to the ILVU data for the changed angle, and reproducing the ILVU data for the changed angle. Information on the position of ILVU data is multiplexed and included in the bit stream of video object data recorded using the interleave method.

12 is a diagram of a conventional data structure of ILVU angle position information SML_AGL_Cn_DSTA specified in the position and size of ILVU data for nine angles contained in a video object bit stream (n is a natural number between 1 and 9 ). Typically, the maximum number of angles supported by a DVD is nine. The ILVU angular position data SML_AGL_Cn_DSTA provides information about the ILVU data for angle #n through a link in the current ILVU data. After reproduction of the current ILVU data, it is possible to change the current angle to a desired angle and reproduce data for the desired angle by using the ILVU angle position data SML_AGL_Cn_DSTA.

During DVD editing for multi-angle data support, images shot at different angles are compressed to form several bitstreams of data with the same reproduction length. Then, bit streams are formed by using an interleaving method and information is inserted into each bit stream, which allows reference to other angles during data reproduction. Accordingly, video object data is recorded on DVD so that angles can be changed during data reproduction.

However, if multi-angle data is divided into predetermined units by using an interleaving method and stored in a DVD, the multi-angle data is not continuously recorded in adjacent areas of the DVD. Therefore, for continuous reproduction of data for angles, generally, the reproduction device needs to move the optical pickup position many times to read the data. Specifically, if a reproducing device reproduces data from an optical disc or a hard disk, the device takes considerable time to change the optical pickup position. There is also a bitrate limitation on the compressed bitstream to compensate for the time delay offset caused when the device changes the optical pickup position.

Contents of the invention

The present invention provides an information storage medium having a data structure in which random access can be performed without considering the position of multi-angle data, and an apparatus thereof.

Additional aspects and/or advantages of the invention will be set forth in part in the description which follows, and will be apparent from the description, or may be learned by practice of the invention.

The present invention provides an information storage medium on which video object data for multiple angles is recorded, the medium comprising: at least one clip, which is a recording unit for recording video object data for each angle, wherein at least one Clips for a certain angle are recorded in adjacent areas of the information storage medium.

According to an aspect of the present invention, video object data for each angle includes: a plurality of jumping points which are access points enabling video object data of different angles to be continuously reproduced; and additional information containing information on the jumping points.

According to an aspect of the present invention, the video object data contains clip information as additional information on a clip, and the clip information contains information on a jump point.

According to an aspect of the present invention, the additional information on each jumping point includes information on a start point for each jumping point of a clip, and is stored in the clip information in a table form.

According to an aspect of the present invention, clip information contains information on randomly accessible entry points, and information on jump points is added to the entry point information and specifies whether each entry point can be used as a jump point.

According to an aspect of the present invention, additional information on jumping points is commonly and additionally recorded on clips of video object data for each angle, and information on positions of respective jumping points of each clip is sequentially included in the common in the jump point information.

According to an aspect of the present invention, the position of a jumping point and the distance between adjacent jumping points can be determined so that when the reproduction position is changed at a jumping point for an angle change during reproduction of a clip for a certain angle, the clip It is reproduced continuously without pause.

According to an aspect of the present invention, information on PlayItem and PlayList is recorded as information on playback units, and information on a plurality of PlayItems forming an angle block is recorded as information on PlayItems for a plurality of angles. Clips correspond, and each PlayList has a plurality of PlayItems.

According to an aspect of the present invention, information on PlayItem and PlayList is recorded as information on reproduction units, and information on each PlayList is recorded to correspond to each angle, each PlayItem corresponds to each Clip and each PlayList has a plurality of PlayItems .

According to an aspect of the present invention, additional information about a certain angle is added to each PlayList, and each PlayList is information for a different angle and is recorded to correspond to each angle.

According to an aspect of the present invention, clip information contains information on randomly accessible entry points, and since all entry points are jump points, the jump point information is entry point information.

According to an aspect of the present invention, within a range that does not cause buffer underflow, it is determined that a part of the clip that is not allowed to jump to the entry point immediately after clip reproduction or jumping to the entry point is determined, and the portion of the part that is not allowed to jump is determined. length.

According to an aspect of the present invention, the clip information contains information on the portion that does not allow jumping immediately after data reproduction or jumping.

The present invention can also be realized by a reproducing apparatus for reproducing data recorded on an information storage medium in which a plurality of video object data is recorded in units of clips as recording units, and clips are separately recorded in relative In the adjacent area, when the video object data is multi-angle video object data, each clip containing information about the video object data corresponding to each angle is recorded, the device includes: a detector that detects the relevant clip, and when reproducing the multi-angle When the video object data is read and reproduced, the detected relevant clips in the adjacent area of the information storage medium are read and reproduced.

According to an aspect of the present invention, the video object data for each angle has a plurality of jumping points so that the video object data for different angles can be continuously reproduced, additional information about the jumping points is recorded on the information storage medium, and the jumping points Indicates the position of a clip divided by the same reproduction time, the device reads and reproduces the clip for an angle in the adjacent area of the information storage medium by reproducing the clip to a certain jump point, and when necessary during reproduction of the clip Another clip for the changed angle is reproduced from a jump point corresponding to the certain jump point when the angle is changed to reproduce the multi-angle video object data.

According to an aspect of the present invention, each video object data further includes clip information providing additional information about a clip as a recording unit, the clip information being additional information about a jumping point, and the apparatus detects a clip information about a jumping point from the clip information about a related clip. additional information for .

According to an aspect of the present invention, the additional information on the jumping point includes information on the start point of each jumping point in the clip and is stored in the clip information in the form of a table, and when the angle is changed during reproduction of the clip, the device estimates Jumping points of clips for multi-angle data are connected to each other, additional jumping point information of the clips is recorded at a predetermined position in the table, and the device detects the connected jumping points of the clip being reproduced and the clip for the changed angle , and reproduce the clips at the detected jump points, respectively.

According to an aspect of the present invention, clip information contains information on randomly accessible entry points, and information on jump points is added to the entry point information to specify whether the relevant entry point is used as a jump point, and when the angle changes, the device Jumping points of clips estimated to be used for multi-angle data are connected to each other, jumping point information is recorded at the same position as entry point information, the apparatus detects the connected jumping points, and reproduces clips at the detected jumping points.

According to an aspect of the present invention, additional information on jumping points is commonly included in the video object data in units of multiple clips for multiple angles, and information on the position of the jumping point of each clip is represented by Form order is contained in common jumping point information, and when the angle is changed, the device reads common jumping point information on clips used for multi-angle data reproduction, detects connected jumping points based on the common jumping point information, and detects out of the jump point to reproduce the clip.

According to an aspect of the present invention, the position of each jumping point and the distance between adjacent jumping points are determined so that when the angle is changed during reproduction of a clip for a certain angle, the clip is continuously reproduced without pausing, the device The reproduction is performed even when the user inputs an angle change signal by completing the reproduction of the cut to the jump point closest to the reproduction position, and the cut for the changed angle is reproduced from the jump point corresponding to the previous jump point.

According to an aspect of the present invention, information on PlayItem and PlayList is recorded as information on playback units, information on a plurality of PlayItems forming an angle block is recorded as information on PlayItems for a plurality of angles, each PlayItem indicates clip or a part thereof, each PlayItem corresponds to each clip and each PlayList has a plurality of PlayItems, the device reproduces one of the plurality of PlayItems forming an angle block to reproduce the plurality of PlayItems of the angle block, and when an angle change is required, from the The angle block renders another PlayItem.

According to an aspect of the present invention, information on PlayItems and PlayLists is recorded as information on reproduction units, each PlayItem indicates a Clip or a part thereof, each PlayList is recorded to correspond to each angle, each PlayItem corresponds to each Clip and each PlayList Having a plurality of PlayItems, the device reproduces a PlayList corresponding to a desired angle.

According to an aspect of the present invention, each PlayList further includes information on a corresponding angle, and the device reproduces the PlayList corresponding to the corresponding angle.

The present invention can also be realized by a recording apparatus for recording multi-angle video object data on an information storage medium in which random access can be performed, the apparatus including: Each video object data for each angle is recorded in adjacent areas of the information storage medium in units, and clips are recorded in the information storage medium without using an interleave method.

According to an aspect of the present invention, the device creates a plurality of jumping points other than video object data for each angle and information about the plurality of jumping points on the information storage medium, and the jumping points are used for video objects of different angles. Data can be continuously reproduced.

According to an aspect of the present invention, the apparatus creates clip information for a clip, which is a data recording unit and contains information on a jump point, in addition to video object data.

According to an aspect of the present invention, the jumping point information includes information on a start point of each jumping point for each clip, and the jumping point information is contained in the clip information in a table form.

According to an aspect of the present invention, the device records clip information to contain entry point information on randomly accessible points and adds jump point information to the entry point information to indicate whether each entry point is used as a jump point.

According to an aspect of the present invention, the apparatus collectively records clips for multi-angle data to contain jumping point information, and the common jumping point information contains information on the location of the jumping point of each clip in table form order.

According to an aspect of the present invention, the device determines and records the position of a jump point and the distance between adjacent jump points so that when the position of reproduction is changed at a jump point for an angle change during reproduction of a clip for a certain angle , the clips are reproduced continuously.

According to an aspect of the present invention, the device records information on PlayItem and PlayList as information on playback units, and records information on a plurality of PlayItems forming an angle block as information on multiple angles, each PlayItem corresponding to each clip , and each PlayList has multiple PlayItems.

According to an aspect of the present invention, the device records information on PlayItems and PlayLists as information on reproduction units, and records each PlayItem to correspond to each Clip, each PlayItem corresponds to each Clip and each PlayList has a plurality of PlayItems.

According to an aspect of the present invention, the device adds additional information about a certain angle to each PlayList recorded to correspond to each angle.

Description of drawings

The above and/or other aspects and advantages of the present invention will become clearer and easier to understand through the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 represents the data structure of traditional DVD;

Fig. 2 represents the data structure of traditional VMG area;

Fig. 3 represents the data structure of traditional VTS area;

Figure 4 shows an example of a title linked to a PGC as an entry PGC according to conventional multi-angle data records;

Figure 5 shows an example of the title of the PGC including a plurality of links according to conventional multi-angle data records;

FIG. 6 shows a conventional data structure of PGC according to conventional multi-angle data recording and reproduction;

Fig. 7 represents the data structure of traditional angle block;

FIG. 8 shows a conventional data structure of a VOB and a primitive as a recording unit when multi-angle viewing is applied;

Figure 9 shows angular data alternately recorded using a conventional interleaving method;

FIG. 10 represents data that jumps to angles for selection in view of primitives according to conventional multi-angle data rendering;

11 shows a conventional data structure of information contained in a video object bitstream with interleaved unit (ILVU) data for angle #1;

FIG. 12 shows a conventional data structure of information contained in a video object bitstream for multiple angles;

13 is a diagram of a relationship between PlayList, PlayItem, clip (clip) information, and clips according to an embodiment of the present invention;

14 is a diagram of a relationship between jump units and jump points in an audio/video (AV) stream clip according to an embodiment of the present invention;

15 is a diagram illustrating a plurality of linked angle data clips for multi-angle data reproduction of clips according to an embodiment of the present invention;

16 is a diagram of a relationship between angle data clip jumps and buffers that enable multi-angle video object data to be reproduced without pausing, according to an embodiment of the present invention;

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

FIG. 18 is a diagram of a data structure of a jump point according to a first embodiment of the present invention;

19 is a diagram of a data structure of a jump point according to a second embodiment of the present invention;

FIG. 20 is a diagram of a data structure of a jump point according to a third embodiment of the present invention;

21 is a diagram of an example of a PlayList having PlayItems forming angle blocks according to an embodiment of the present invention;

22 is a diagram for an example of a PlayList of different angles according to an embodiment of the present invention;

23 is a diagram of an example of a PlayList having PlayItems that do not form angle blocks according to an embodiment of the present invention; and

24 to 26 are diagrams showing the structure of an information storage medium storing multi-angle data and reproduction from the information storage medium according to another embodiment of the present invention.

Detailed ways

Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

According to an embodiment of the present invention, multi-angle support is enabled so that angle data is recorded on an information storage medium by using a separate recording method instead of an interleave method. In other words, multi-angle support is realized by recording bit streams for each angle data in adjacent recording areas of the information storage medium. During data reproduction, angle change is realized by dividing data for each angle into jump units (JPU), designating the start address of the JPU as a jump point, and recording information about the jump point of each angle data For additional jump point information. According to an aspect of the present invention, if each entry point is each jump point, the jump point may be detected based on information on the entry point.

In order to understand the present invention better, main element of the present invention enumerates as follows:

(a) compressed and encoded audio/video (AV) streams for each angle;

(b) a clip information file containing information about encoded audio/video (AV) streams, such as attribute information;

(c) PlayItem as reproduction information indicating the reproduction time for the reproduction part between the times IN_time and OUT_time of the clip including the above elements (a) and (b);

(d) a PlayList including at least one PlayItem as reproduction information; and

(e) A jumping point map in which the positions of jumping points are recorded in a table form.

In the present invention, multi-angle data is referred to as multi-angle object (for example, AV, video, audio, other data) data including a plurality of reproduction units corresponding to a certain reproduction time. That is, multi-angle data includes data obtained at different angles by several receiving/data collecting devices (for example, in the case of video, data taken by a camera). Generally, audio data is created as the same angle data at different angles, but may be created differently at different angles. In short, generally, multiple video object data that can be reproduced in the same time zone are called multi-angle data, and multiple contents (such as audio, other data) that can be reproduced in the same time zone are called multi-angle content, but For convenience here, all types of multi-data that can be reproduced in the same time zone are called multi-angle data.

In describing the present invention, using multi-angle AV data as an example of multi-angle data, generally, video object data is large in size and thus stored or transmitted as a compressed bit stream. The present invention uses Clip as a recording unit (ie, data unit) and PlayList and PlayItem as reproduction units. A Clip corresponds to a Video Title Set VOB primitive as a recording unit in a conventional DVD as shown in FIGS. 3 and 6, and PlayList and PlayItem correspond to PGCI Programs and PGCI primitives correspond to.

More specifically, according to the present invention, AV streams are recorded in adjacent areas of an information storage medium in units of clips. Usually, the AV stream is also compressed and recorded to reduce the size of the AV stream. When reproducing the recorded clips, the characteristics of the clips recorded in each clip are used to interpret the compressed video object data. Clip properties or clip information contains audio and video attributes for each clip and an entry point map with information on the location of randomly accessible entry points. In the case of the Moving Picture Experts Group (MPEG) video compression technique, the entry point is located at an intra-coded I-picture. The entry point map is mainly used during a time search to detect a data position at a predetermined time after data reproduction.

FIG. 13 shows the relationship among PlayList, PlayItem, Clip Information, and Clips according to an embodiment of the present invention. Referring to FIG. 13, PlayList is a basic playback unit. In the information storage medium according to the present invention, a plurality of PlayLists are stored. A PlayList includes one or more PlayItem. The PlayItem is linked to a part of the Clip, and more specifically, indicates the start and end times of reproduction in the Clip. Therefore, clip information is used to easily detect a desired part of a clip. Hereinafter, the data structure and recording position of multi-angle data will be described with reference to the drawings.

FIG. 14 is a diagram of a relationship between skip units and jump points in a clip AV stream according to an embodiment of the present invention. Referring to FIG. 14, if a clip represents video object data and part of multi-angle data at a specific angle, the clip is divided into a plurality of jump units and a start point of each jump unit is called a jump point. Each jump point represents a point in a certain clip for another angle which is the start when jumping in or out from a clip for a different angle to a clip for a different angle, respectively, during reproduction of the certain clip point or destination point. Therefore, the clip jump point links the clip to another angle data. According to an aspect of the invention, the jump point is an entry point. However, for seamless data reproduction, not all entry points are always set as jump points because entry points are formed at intervals of about 0.5 seconds.

FIG. 15 is a diagram illustrating a plurality of linked angle data clips for multi-angle data reproduction of clips according to an embodiment of the present invention. As shown in FIG. 15 , assuming that a plurality of clips having the same number of jumping points are linked to each other, the clips are recorded in different areas and are linked to each other by jumping points at the same reproduction time. In order to reproduce a different clip (different angle data clip) during reproduction of a clip, after completion of reproduction of the clip to a predetermined jump point and detection of a jump unit of the different clip corresponding to the predetermined jump unit, a jump from the corresponding jump point is performed. The unit reproduces the different clips, thereby enabling seamless, continuous reproduction of the clips. In FIG. 15, for example, arrows indicate a process in which the clip for the third angle is first partially reproduced, the first angle is selected during the reproduction of the clip for the third angle, and the clip for the first angle is partially reproduced. The clips are reproduced, the mth angle is selected during reproduction of the clip for the first angle, and the clip for the mth angle is reproduced. When the user inputs a command to change the angle, the change is performed in units of jump units.

According to an aspect of the present invention, even when data is recorded in non-contiguous different areas of an information storage medium in which random access can be performed, continuous reproduction from the information storage medium can be performed within a predetermined time when changing the position of the reproduction device data. In the present invention, a change in the position of the reproduction device is described as a jump. Typically, no additional time is required to jump through a volatile electronic information storage medium such as memory. However, in the case of a nonvolatile information storage medium such as an optical disc in which data is read by moving an optical pickup, jumping requires additional time. In addition, when the speed of reading video object data from the information storage medium and the speed of reproducing the read video object data are different, even if the data is recorded in adjacent areas for reading and reproduction, the information storage medium still needs to be able to compensate A device that differs between reading and reproducing speeds. According to the present invention, a video object buffer is used as a device that allows when changing within a predetermined time even when multi-angle data is recorded in non-contiguous different areas of an information storage medium in which random access can be performed. The multi-angle data is continuously reproduced from the information storage medium while reproducing the position of the device, and compensation for the difference between reading and reproducing speeds is provided. Data read from an information storage medium at a predetermined speed is stored in a video object buffer, and then the data is reproduced from the buffer. During data reading, it is important to control the speed at which data is read to prevent overflow or underflow of the video object buffer. Even if video object data is recorded at a variable bit rate (VBR), the use of the video object buffer enables seamless reproduction of the data.

FIG. 16 is a diagram of a relationship between angle data clip jumps and buffers enabling multi-angle video reproduction without pauses according to an embodiment of the present invention. As shown in FIG. 16, the size of each jump unit (JPU) is within a range that allows the video object data stored in the video object buffer to be seamlessly reproduced when jumping to clips of video object data for different angles. is determined within , and the rendering of the next skip unit for that different angle starts before the buffer underflow occurs. As shown in FIG. 14, JPU is obtained by dividing the angle data clip. In the case where additional time is required to jump to a reproduction device for a jump point of a different angle, the size of the jump unit is determined by the following conditions, assuming that the longest jump time is T_JUMP, the speed of reading data is V_R, and The speed at which video object data is reproduced is V_O:

Jump unit size>V_R*V_O*T_JUMP/(V_R-V_O) ...(1)

In addition, generally, the size of the video object buffer satisfies the following:

Buffer size (B)>V_O*T_JUMP ...(2)

FIG. 17 is a diagram of a data structure of a PlayList having a multi-angle structure according to an embodiment of the present invention. The PlayList of FIG. 17 includes a plurality of PlayItems having a sequence structure and angle block PlayItems having a multi-angle structure. The angle block PlayItem includes a plurality of PlayItems corresponding to a plurality of angle data clips. In the case of the angle block PlayItem, when PlayList is played back, only one of the PlayItems is played back. Also, during reproduction of the angle block PlayItem, an angle change may be performed by selecting a PlayItem of a changed angle from the angle block PlayItem and reproducing the selected PlayItem. Normally, PlayItems that make up an angle block have the same length of reproduction time. More specifically, in FIG. 17, Clips 2 to 4 specified by PlayItems of the angle block PlayItem are not interleaved but recorded in adjacent areas. In other words, Clips 2 to 4 are respectively recorded in the recording area in the same manner as clips specified by PlayItems that do not belong to the angle block PlayItem (ie, Clips 1 and 5). However, clips 2 to 4 include jump point information.

Hereinafter, three types of jump point data structures in clip information will be described with reference to the drawings. FIG. 18 is a diagram for a data structure of jumping points in clips for angles according to the first embodiment of the present invention. Referring to FIG. 18, clip information includes a jump point map in addition to general information of the PGC or MPEG standard and entry point map. The jumping point information contained in the jumping point map is closely related to the video object data. Therefore, jumping point information is included in the clip information data and provides additional information about the clip.

In Fig. 18, the general information of clip information contains the following information:

-version_number: The version of the clip information file.

- EPMap_start_address: The start address of the entry point map indicated by the byte number from the first byte of the clip information file.

- JPMap_start_address: The start address of the jump point map indicated by the byte number from the first byte of the clip information file. If the value of JPMap_start_address is 0, this means that the clip related to the clip information file is not for angle data and the clip does not contain information on jump point mapping.

-ClipInfo: Attributes of the AV stream file related to the clip information file.

In FIG. 18, the entry point map of clip information contains information on the time and position of randomly accessible entry points. The jumping point map of clip information contains information of jumping points through which clips of angle data can be actually connected to clips of different angles. According to an aspect of the present invention, the jump manager information included in the jump point map indicates the number of jump points and the number of jump point information entries following the jump manager information. The jumping point information is used to detect the position of each jumping point and the starting position in the associated angle data clip. According to an aspect of the present invention, jumping point information is represented by bytes or some sectors. Furthermore, if video object data is encoded as an MPEG transport stream, according to an aspect of the present invention, each jump point information is represented by some MPEG-TS packets.

FIG. 19 is a diagram for a data structure of jumping points in clips for angles according to the second embodiment of the present invention. The jump point data structure in FIG. 19 represents an entry point map including jump point information. Thus, an advantage of the data structure of Figure 19 is that it does not require any additional space to store jump point information. As described above, when video object data is encoded by using time-space compression such as MPEG, a jump point should be set as an entry point as a random access entry point. Jump information is easily recorded by incorporating information on whether an entry point is used as a jump point into the entry point map.

FIG. 20 is a diagram for a data structure of jumping points in clips for angles according to a third embodiment of the present invention. In FIG. 20, jumping point information of clips (see FIG. 17) forming angle blocks is included. The jump point map information structure is a separate data structure from the clip information structure. The jumping point mapping information includes: jumping manager information indicating the number of clips forming the angle block and the number of jumping points existing in the clips; and jumping point information of each clip sequentially following the jumping manager information. The jump point map information structure enables easy detection of desired angular positions.

FIG. 21 is a diagram for an example of a PlayList having PlayItems forming angle blocks according to an embodiment of the present invention. Referring to FIG. 21, each PlayItem information contains general PlayItem information and angle block information. The angle block information mainly specifies whether the PlayItem forms an angle block PlayItem. Normally, PlayItems forming an angle block are recorded sequentially. During reproduction of PlayList, at least one PlayItem selected from PlayItems forming an angle block is reproduced. During reproduction of one PlayItem among angle block PlayItems, another PlayItem forming the angle block may be reproduced.

Fig. 22 is a diagram of an example of a PlayList as a playback unit for different angles. Referring to FIG. 22, each PlayList includes a single PlayItem not forming an angle block or a plurality of PlayItems for a single angle. That is, each PlayList corresponds to an angle. FIG. 23 is a diagram of an example of a PlayList having PlayItems not forming an angle block (ie, a PlayList including a single PlayItem) according to an embodiment of the present invention. As shown in FIG. 23, each PlayList contains angle block information on angles, which in this case indicates that PlayItem information does not form an angle block. When the user selects an angle or changes an angle, the related/corresponding angle PlayList is reproduced.

According to the present invention, data recording units constituting multi-angle data are recorded in adjacent areas of an information storage medium. Jumping points inserted in recording units interface with recording units of different angles, and information on the jumping points is stored as additional information (ie, clip characteristics or clip information). Then, information on reproduction units corresponding to recording units is stored as multi-angle information (ie, PlayList and PlayItem).

The reproduction device according to the present invention reproduces multi-angle data and has the following advantages:

First, when angle data is being reproduced and if the angle is changed, multi-angle data can be read from adjacent areas of the information storage medium and the read data can be continuously reproduced. That is, multi-angle data is encoded by using the same method used to encode non-multi-angle data. Therefore, contrary to the interleaved method, no additional data and encoding operations are required to continuously reproduce data for angles.

Second, a clip as a recording unit contains jump point information enabling connection to video object data for another angle. In order to change the angle when reproducing the video object data for the current angle, the reproducing device reproduces the video object data for the current angle to the next jump point, and then reproduces the video for the changed angle from the jump point corresponding to the next jump point. Video object data.

Third, when multi-angle information is recorded with a plurality of PlayItems forming an angle block and belonging to a PlayList (see Fig. 17 and Fig. PlayItem to the jump point closest to the current reproduction position of the clip, and then reproduce the clip for the changed angle from the jump point. If a single PlayList is recorded for each angle as shown in FIG. 22, when the user wants to change the angle during reproduction of the PlayList, the PlayList for the changed angle is detected and reproduced.

A recording apparatus according to the present invention records multi-angle data as clips on an information storage medium, including clip information on jumping points, and records reproduction unit records linked to data recordings. The recording device according to an embodiment of the present invention determines the size of a jump unit as a part of a divided clip based on the read speed V_R of the reproducing device, the jump time T_JUMP, and the highest bit rate V_O of the video object data (see equation (1) and (2)).

Then, the determined skip unit size is converted into a reproduction time. Then, video object data is encoded so that a random access (entry) point is set to be greater than or equal to the reproduction time. Here, generally, the interface to the video object data is the jumping point. Generally, a random access point is a start point of a group of pictures (GOP) in time-space compression coding such as MPEG, and in the case of MPEG, a jump point is set as an entry point. Thus, with MPEG, each skip unit consists of multiple GOPs. Also, generally, jump points are formed in the same reproduction time zone of each video object data.

For each angle, encoded video object data is recorded in adjacent areas of the information storage medium. Information on the location of the jump point is recorded as additional information. According to an embodiment of the present invention, information on jumping points of each clip may be recorded as clip information, thereby providing clip characteristics.

Then, information on reproduction units forming multi-angle data is created and recorded. For example, a PlayList including PlayItems corresponding to clips of multiple angles is formed by linking PlayItems to each other (that is, angle block PlayItems). On the other hand, a single PlayList can correspond to a single angle.

24 to 26 are diagrams showing the structure of an information storage medium storing multi-angle data and reproduction from the information storage medium according to another embodiment of the present invention. According to an aspect of the present invention, an information storage medium has a data structure in which video object data for multiple angles is recorded in units of clips and all entry points formed in clips are set as jump points.

When the user wants to change the angle during reproduction of a clip for an angle, the reproduction device according to the present invention reproduces the clip to the entry point of the clip closest to the current reproduction position, jumping to the entry point corresponding to the reproduced clip The entry point of the clip for changing the angle, and reproduce the clip for changing the angle after the entry point of the clip for changing the angle. Here, generally, all entry points for all angles are formed in clips in the same time zone. In other words, as shown in FIG. 24, pieces of video angle object data physically recorded in adjacent and different areas are logically linked to each other through entry points.

Generally, as shown in FIG. 25, an entry point EP is a recording unit having a reproduction time between 0.5 second and 1 second and is also formed at a position where random access can be performed. When multi-angle video object data is compressed using MPEG, the video object data includes a plurality of GOPs. In order to use an entry point of video object data including a plurality of GOPs as a jumping point during an angle change, it is required that all pictures in a GOP be formed by a closed GOP (closed GOP) encoded using only pictures in the relevant GOP.

In a recording medium data structure in which all entry points are jump points, no additional information on the jump points is required. However, in this data structure, an underflow of the reproduction buffer may be caused when the reproduction device jumps to the entry point to change the angle. Therefore, according to an aspect of the present invention, in order to prevent the reproducing device from jumping to the entry point of a certain part of the information storage medium during jumping or just after jumping, as shown in FIG. 25 , a no-skip section is provided. A section that does not allow jumps is called a no-jump block (NJB).

Referring to FIG. 26, when the amount of data contained in the buffer is less than the amount of data B immediately after data reproduction or jumping of the reproducing device, the angle change is not allowed. Here, the amount of data B is the minimum amount of data that allows seamless reproduction of images of the jump time JUMP_T. When image reproduction continues beyond the NJB length, the amount of data in the buffer is always greater than the amount of data B and jumps are allowed at all entry points.

The length of NJB can be calculated using the same method as calculating the length of JPU. More specifically, assuming that the longest jump time is T_JUMP, the speed of reading data is V_R, and the speed of reproducing video object data is V_O, the length of NJB is calculated as follows:

NJB length>V_R*V_O*T_JUMP/(V_R-V_O) ...(3)

Furthermore, generally, the size of the buffer is determined to satisfy the following:

Buffer size (B)>V_O*T_JUMP ...(4)

Industrial availability

As described above, according to the present invention, video object data for multi-angle data is divided into predetermined units (ie, clips and their jump units) and recorded in adjacent areas of an information storage medium without using an interleaving method. More specifically, if the "clip" of the present invention corresponds to the prior art VOB as a data recording unit, in the present invention, in the case of multi-angle data, the "clip" is recorded in adjacent areas on the storage medium middle. In contrast to the present invention, in the prior art, in the case of multi-angle data, the primitives of the VOB are recorded according to the interleave method, or, for example, in the case of two angles as shown in FIG. on alternate areas of the storage medium. Accordingly, in the present invention, the planning of the data area is easy to be controlled and managed by the optical recording and reproducing apparatus, and random access is easy to perform, thereby efficiently recording/reading multi-angle data (i.e., more than conventional multi-angle data recording / read less optical pickup position movement) and extend the traditional bitrate limit on compressed bitstreams.

The multi-angle data recording and reproduction processing of the present invention contained in the multi-angle data recorder/reproduction described above is realized by using software and/or computing hardware. For example, the processing of the present invention may be embodied in a detector and a reproducer of a multi-angle data renderer and a processor programmed to convert received/input multi-angle data from any source type according to the multi-angle data of the present invention The angle data structure is recorded on the information storage medium. More specifically, the information storage medium controls the multi-angle data reproducing device by having a data structure including at least one clip object for each angle, each clip being a data recording unit of multi-angle data for an angle. Each angle clip is divided into predetermined jump units at predetermined jump points, and each is recorded in an adjacent area of the information storage medium. Using clip jump points as links between adjacent recorded angle clips provides efficient random access for reading multi-angle data for angle changes. Therefore, the present invention provides an information storage medium recording device, comprising: a programmed computer processor, which divides multi-angle data into predetermined angle units designated by jump points (each angle unit includes at least two or more data primitive), the jumping point is used to link predetermined angle units of the multi-angle data, and the computer processor records each predetermined angle unit including the jumping point in an adjacent area of the information storage medium.

While certain embodiments of the present invention have been shown and described, it should be understood by those skilled in the art that modifications may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents. to modify.

Claims (2)

1, a kind of from the equipment of information storage medium reproduction with the moving picture data of the corresponding different angles of motion picture, this equipment comprises:

Reading unit reads and the corresponding montage AV stream of the moving picture data of different angles from information storage medium, and described montage AV stream is interlaced with one another; And

Reproduction units, reproduce montage AV stream according to flowing corresponding clip information with montage AV, wherein, each clip information includes the stomion mapping, whether the mapping of described entrance comprises about the information of corresponding one entrance in the montage AV stream of random access and is the information of angle change points about each of entrance, wherein, angle change points is the point from an angle to another angle reproduction of moving picture.

2, equipment as claimed in claim 1 wherein, comprises the positional information of the entrance in the AV stream about the information of entrance.

Images