Patent Publication Number: US-8526793-B2

Title: Information storage medium including meta data for multi-angle title, and apparatus and method for reproducing the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 11/297,507 filed on Dec. 9, 2005, now pending, which claims all benefits accruing under 35 U.S.C. §119 from Korean Patent Application No. 10-2004-0104618, filed on Dec. 11, 2004, and Korean Patent Application No. 10-2005-0119084, filed on Dec. 7, 2005 in the Korean Intellectual Property Office, the disclosures of which are incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to reproduction of audio-visual (AV) data recorded on an information storage medium, and more particularly, to an information storage medium including meta data to provide an enhanced search function of searching for moving picture data supporting multi-angle using various search keywords, and an apparatus and method for reproducing AV data from the information storage medium. 
     2. Related Art 
     Information storage media, such as DVDs and Blu-ray discs, store moving picture data (multimedia image) including video, audio and/or subtitles compressed and encoded according to standards for digital video and audio compression, such as the MPEG (Motion Picture Experts Group) standard. Also, the storage media further store additional information, such as the encoding attribute of the moving picture data, the reproduction order of the moving picture data, etc. Conventionally, moving images recorded on a storage medium are sequentially reproduced according to such reproduction information or are reproduced while jumping in units of chapters when AV data is reproduced. 
     However, a method for jumping to an arbitrary scene according to a user&#39;s search criterion, such as scene, character, location, background music, property, etc., and reproducing moving picture data from the arbitrary scene still has not been proposed. Furthermore, since moving picture data is compressed, encoded, multiplexed and recorded on conventional storage media based on the MPEG2 standard, it is difficult to include meta data for providing a moving image search function on the storage media. Also, after the conventional storage media are manufactured, moving picture data or meta data contained therein cannot be edited and/or reused. 
     When a content producer attempts to classify moving picture data according to a scene and define meta data so as to allow a user to search for and reproduce the moving picture data according to the scene, in a moving image title supporting multi-angle, it is preferable to map each angle to corresponding meta data, if some part or the entire scene includes moving picture data composed of a plurality of angles. However, the conventional meta data structure does not provide and cannot be used to distinguish multi-angle. 
     SUMMARY OF THE INVENTION 
     Various aspects and example embodiments of the present invention provide a storage medium including meta data to provide an enhanced search function of searching for moving picture data recorded in a multi-angle title using various search keywords, and an apparatus and method for reproducing data from the storage medium. A meta data structure is provided with an enhanced search function of jumping to an arbitrary location of moving picture data and reproducing the moving picture data from the arbitrary location. The search can be conducted according to a user&#39;s search criterion, such as scene, character, shooting background, etc., in a moving picture data structure in which moving picture data supporting multi-angle can be selectively reproduced. 
     Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. 
     According to an aspect of the present invention, an information storage medium is provided with moving picture data supporting multi-angle; and meta data for providing an enhanced search function on the moving picture data, wherein the meta data is defined scene by scene, and comprises information regarding at least one search keyword to be applied to a corresponding scene, and information regarding an angle supported by the corresponding scene. 
     The meta data further comprises information regarding a start location and a reproduction duration time of the corresponding scene. The search keyword includes at least one of a search keyword regarding scene type, a search keyword regarding character, a search keyword regarding actor, and a search keyword regarding search criterion which a producer arbitrarily defines. 
     The meta data is included in a PlayListMark, which is a group of marks, each mark indicating a specific location of moving picture data corresponding to a Playlist that is a reproduction unit of the moving picture data. Alternatively, such meta data can be recorded separately from a PlayListMark, which is a group of marks, each mark indicating a specific location of moving picture data corresponding to a Playlist that is a reproduction unit of the moving picture data. 
     According to another aspect of the present invention, a reproducing apparatus is provided with a search unit arranged to search for a scene satisfying a predetermined search condition, with reference to meta data, from a storage medium which stores moving picture data supporting multi-angle; and the meta data for providing an enhanced search function on the moving picture data, wherein the meta data is defined scene by scene, and comprises information regarding at least one search keyword to be applied to a corresponding scene and information regarding an angle supported by the corresponding scene; and a reproducing unit arranged to reproduce moving picture data corresponding to angle information supported by the searched scene. 
     The reproducing apparatus further includes a reader arranged to read the moving picture data and at least one of the meta data from the storage medium. 
     The search unit receives the at least one meta data from the reader, compares a predetermined search condition received from an external source with search keyword information included in the meta data, and searches for meta data satisfying the predetermined search condition. 
     The search keyword includes at least one of a search keyword regarding a scene type, a search keyword regarding one or more characters appearing in the corresponding scene, a search keyword regarding one or more actors/actresses playing the corresponding characters, and a search keyword regarding a search criterion which a producer arbitrarily defines. 
     The reproducing unit reproduces the moving picture data using information regarding a start location and a reproduction duration time of the searched scene. 
     The meta data defines a reproduction section decided by a part of PlayItems which are reproduction units of the moving picture data or at least one PlayItem, and when the reproduction section is defined by a single angle PlayItem and a multi-angle PlayItem, the reproducing unit reproduces moving picture data corresponding to a default angle with respect to the single angle PlayItem and reproduces moving picture data corresponding to a supported angle with respect to the multi-angle PlayItem. 
     According to another aspect of the present invention, a reproduction method is provided with receiving a predetermined search condition; searching for a scene satisfying the predetermined search condition, with reference to meta data, from a storage medium which stores moving picture data supporting multi-angle; and the meta data for providing an enhanced search function on the moving picture data, wherein the meta data is defined scene by scene, and comprises information regarding at least one search keyword to be applied to a corresponding scene and information regarding an angle supported by the corresponding scene; and reproducing moving picture data corresponding to angle information supported by the searched scene. 
     In addition to the example embodiments and aspects as described above, further aspects and embodiments of the present invention will be apparent by reference to the drawings and by study of the following descriptions. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A better understanding of the present invention will become apparent from the following detailed description of example embodiments and the claims when read in connection with the accompanying drawings, all forming a part of the disclosure of this invention. While the following written and illustrated disclosure focuses on disclosing example embodiments of the invention, it should be clearly understood that the same is by way of illustration and example only and that the invention is not limited thereto. The spirit and scope of the present invention are limited only by the terms of the appended claims. The following represents brief descriptions of the drawings, wherein: 
         FIG. 1  is a view illustrating the structure of typical moving picture data recorded on a storage medium; 
         FIG. 2  is a view illustrating the structure of typical moving picture data including a multi-angle title recorded on a storage medium; 
         FIG. 3  is a view illustrating an example data structure of meta data providing an enhanced search function according to an embodiment of the present invention; 
         FIG. 4  is a view illustrating a meta data architecture which can be applied to a multi-angle title according to an embodiment of the present invention; 
         FIG. 5  shows an example in which the meta data shown in  FIG. 4  is described by a markup language; 
         FIG. 6  is a view for explaining an example of providing an enhanced search function in a multi-angle title, using meta data according to an embodiment of the present invention; 
         FIG. 7A  shows an example format in which meta data is included in a PlayListMark according to an embodiment of the present invention; 
         FIG. 7B  shows an example syntax structure of a PlayListMark based on the format shown in  FIG. 7A ; 
         FIG. 8A  shows an example format in which a PlayListMark is separated from meta data according to another embodiment of the present invention; 
         FIG. 8B  shows example meta data based on the format shown in  FIG. 8A ; 
         FIG. 9  is a block diagram of an example reproducing apparatus according to an embodiment of the present invention; and 
         FIG. 10  is a flowchart of a reproducing method according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures. 
       FIG. 1  is a view illustrating the structure of audio-visual (AV) data recorded on a storage medium. Referring to  FIG. 1 , a storage medium (such as the medium  910  shown, for example, in  FIG. 9 ) is formed with multiple layers, i.e., at least a clip layer and a playlist layer, so as to manage the data structure  100  of AV data recorded thereon. The data structure  100  includes one or more clips  110  that are recording units of a moving picture (multimedia image), and one or more Playlists  120  that are reproducing units of a moving picture (multimedia image). 
     Each clip  110  is implemented as one object which includes a clip AV stream  112  for an AV data stream for a high quality picture movie, and clip information  114  for the attributes corresponding to the AV data stream. Each Playlist  120  is a set of reproduction intervals of these clips  110 , and each reproduction interval is referred to as a PlayItem  122 . Each Playlist  120  further includes a PlayListMark  124  to provide a specific location of AV data. 
     In the clip AV stream  112 , AV data is recorded in units of clips. Generally, AV data is successively recorded in a storage area after being compressed and encoded to reduce a storage capacity. In order to reproduce the compressed and encoded AV data, characteristic information of the compressed AV data is needed. Accordingly, clip information  114  containing the characteristic information of the compressed AV data is included in each clip  110 . 
     The clip information  114  includes characteristic information, such as the audio/video attribute of each AV data, an entry point map including the location information of entry points allowing random access in units of a predetermined region, etc. In the MPEG standard, which is widely used among moving picture compression methods, the entry point is the location information of an “I” picture from which intra pictures are compressed, and the entry point map is used for time search to detect a time point when a predetermined time elapses after reproduction is started. 
     Meanwhile, the storage medium  100  stores a plurality of Playlists  120 , which are reproduction units. Each Playlist  120  includes a PlayListMark  124  indicating a specific location of AV data, and at least one PlayItem  122  which is a reproduction sub unit of the AV data. 
     The PlayItem  122  indicates a part of the AV stream, and more specifically, sets a reproduction start time and a reproduction end time of the AV stream and stores them in the clip information  114  to indicate a part of the corresponding AV data. That is, the PlayItem  122  is used to detect the location of a corresponding part in actual AV data using the entry point map included in the clip information  114 . 
     Generally, AV data is reproduced in units of Playlists  120  and in an order of PlayItems  122  listed in a Playlist  120 . However, it is possible to jump to a specific location of a moving image stream (AV data stream) using a PlayListMark  124  and reproduce the moving image stream (AV data stream) from the specific location. 
       FIG. 2  is a view illustrating an example data structure of AV data including a multi-angle title. Referring to  FIG. 2 , a Playlist  200  includes a PlayItem  210 , an angle block PlayItem  220 , and a PlayItem  230 . 
     The PlayItem  210  is a single-angle PlayItem and indicates a clip # 1   241 . The angle block PlayItem  220  includes information  221  indicating a clip # 2   242 , information  222  indicating a clip # 3   243 , and information  223  indicating clip # 4   244 . The PlayItem  230  indicates a clip # 5   245 . 
     Turning now to  FIG. 3 , an example data structure of meta data providing an enhanced search function according to an embodiment of the present invention is illustrated. Referring to  FIG. 3 , a Playlist  300 , which is a reproduction unit of a moving picture (multimedia image), includes PlayItems  370  and meta data  310 , is defined according to a scene to include a reproduction section defined in one or some of the PlayItems  370 . A content producer can arbitrarily classify scenes and allow the classified scenes to be independently reproduced. 
     The Playlist  300  includes meta data related to a scene # 1   320 , a scene # 2   330 , and a scene # 3   340 , wherein the scene # 1   320  defines a part of the PlayItem  371 , the scene # 2   330  defines a part of the angle block PlayItem  372 , and the scene # 3   340  defines a part of the PlayItem  373 . 
     The PlayItem  371  indicates a clip # 1   381 , the angle block PlayItem  372  indicates a clip # 2   381 , a clip # 3   383 , and a clip # 4   384 , and the PlayItem  373  indicates a clip # 5   385 . 
     Meta data corresponding to the scene # 2   330  defining the angle block PlayItem  372  includes element information  350  and attribute information  360 . The element information  350  includes information for extended search, such as SceneType  351  representing the types of scenes, Character  352  including information regarding characters appearing in the corresponding scene, Actor  353  including information regarding actors/actresses playing the corresponding characters, etc. In addition, the element information  350  can further include a producer definition element  354  representing information (such as background music, shooting location, property, etc.) which is arbitrarily defined by a content producer. Accordingly, it is possible to reproduce AV data while jumping to an arbitrary location of the AV data, according to a user&#39;s search criterion, such as scene, character, location, background music, property, etc., and to allow a user to perform various searches. 
     The attribute information  360  includes an entry point  361  representing a reproduction start point of the corresponding scene, a duration  362  representing a reproduction duration time of the corresponding scene, and angle information  363  representing information regarding respective angles included in the corresponding scene. 
     As such, in the information storage medium according to the present invention, meta data defined according to scene includes angle information. Therefore, if a producer inserts search keyword information of scenes corresponding to angles to be provided to users into the meta data, AV data corresponding to a desired angle can be provided when an enhanced search function according to scene is executed. 
     In more detail, a data structure of a scene, for example, scene # 1   320 , scene # 2   330 , and scene # 3   340 , as shown in  FIG. 3 , which is meta data  310  will be described.  FIG. 4  is a view illustrating a meta data architecture which can be applied to a multi-angle title according to an embodiment of the present invention. 
     Specifically,  FIG. 4  illustrates a data structure of a meta data scene, for example, scene # 1   320 , scene # 2   330 , and scene # 3   340 , as shown in  FIG. 3 , for providing an enhanced search function of searching for a desired location of AV data according to a user input and reproducing the AV data from the desired location. That is, the meta data scene, for example, scene # 1   320 , scene # 2   330 , and scene # 3   340 , as shown in  FIG. 3 , includes element information  350 , such as scenetype information  351 , character information  352 , actor_actress information  353 , and authordef information  354 , which can be used as search keywords for various searches, and attribute information  360  such as entry-point information  361  representing a reproduction start point of the corresponding scene, duration information  362  representing a reproduction duration time of the corresponding scene, and angle_number information  363  representing a corresponding angle in the case of multi-angle are defined as attributes of the corresponding scene. Accordingly, by defining information regarding respective angles included in the corresponding scene using the angle_number information  363  being attribute information, it is possible to provide an enhanced search function according to angle in the case of a multi-angle title. 
       FIG. 5  shows an example in which the meta data illustrated in  FIG. 4  is described by a markup language, such as an extensible markup language (XML). 
     Referring to  FIG. 5 , the meta data scene, for example, scene # 1   320 , scene # 2   330 , and scene # 3   340 , as shown in  FIG. 3 , is defined in an XML format. The meta data scene includes element information  350 , such as “scenetype”, “character”, “actor_actress”, and “authordef” as search keywords, thereby providing an enhanced search function using various search keywords. Also, the meta data scene includes attribute information  360 , such as “entry_point”, “duration”, and “angle_number”, thereby providing an enhanced search function in a multi-angle title. 
       FIG. 6  is a view for explaining an example of providing an enhanced search function in a multi-angle title using meta data according to an embodiment of the present invention. 
     Referring to  FIG. 6 , a multi-pass title consisting of a plurality of angles is shown. In  FIG. 6 , the multi-pass title consists of five (5) PlayItems, including PlayItems # 1  through # 5 , wherein a PlayItem # 2  consists of three (3) angles and a PlayItem # 4  consists of four (4) angles. As shown in  FIG. 6 , each scene is defined by a single PlayItem, or by a plurality of PlayItems. Each meta data  310  regarding to each scene, for example, scene # 1 , scene # 2 , scene # 3  and scene # 4 , includes information for extended searching on moving picture data of the corresponding scene. 
     Meanwhile, in the PlayItem # 2  and the PlayItem # 4  supporting multi-angle, information for extended searching on AV data corresponding to an angle of the plurality of angles is defined. 
     For example, in the case of scene # 1 , a reproduction section is defined by the PlayItems # 1  and # 2  and an angle number “3” is designated. Angle numbers are assigned only to PlayItems supporting multi-angle, and the remaining PlayItems not supporting multi-angle are reproduced as default angles. Accordingly, when the scene # 1  is reproduced, the PlayItem # 1  is reproduced as a default angle, and the PlayItem # 2  supporting multi-angle is reproduced as an angle “3” according to a value defined in the corresponding angle_number attribute. Here, search keywords for extended search defined in the scene # 1  are applied to the angle “3” in the PlayItem # 2  supporting multi-angle. 
     In the case of scene # 2 , a reproduction section is defined by the PlayItems # 2  and # 3 , and an angle number “3” is designated. Accordingly, when the scene # 2  is reproduced, the PlayItem # 2  is reproduced as an angle “3” according to a value defined in the corresponding angle number attribute, and the PlayItem # 3  is reproduced as a default angle. 
     In the same manner, in the case of scene # 3 , a reproduction section is defined by the PlayItems # 2 , # 3 , and # 4 , and an angle number ( 3 ,  3 ) is designated. Accordingly, the PlayItem # 2  supporting multi-angle is subjected to extended search by a search keyword based on the angle “3” according to the first designation value of angle numbers, the PlayItem # 3  including single angle information is subjected to extended search by a search keyword based on a default angle, and the PlayItem # 4  supporting multi-angle is subjected to extended search by a search keyword based on the angle “3” according to the second designation value of the angle numbers. 
     In the case of scene # 4 , a reproducing region is defined by the PlayItems # 2 , # 3 , and # 4 , and an angle number “4” is designated. Accordingly, the PlayItem # 2  supporting multi-angle is subjected to extended search by a search keyword based on an angle “1” as a default angle because the PlayItem # 2  does not include the corresponding angle “4”, the PlayItem # 3  including single angle information is subjected to extended search by a search keyword based on a default angle, and the PlayItem # 4  supporting multi-angle is subjected to extended search by a search keyword based on the angle “4” according to the designated angle number “4”. 
     As described above, by using meta data defined according to scene, it is possible to provide various extended search functions according to designated search keywords in the case of a multi-angle title. 
       FIG. 7A  shows an example format in which meta data is included in a PlayListMark according to an embodiment of the present invention. 
     Referring to  FIG. 7A , a storage medium  700  according to an embodiment of the present invention includes clips  380  including a clip AV stream  112  and clip information  114 , and a Playlist  300  including PlayItems  371 ,  372 , and  373 . Each clip  380  is a recording unit of a moving picture (multimedia image), and the playlist  300  and the playitems  371 ,  372 , and  373  are reproduction units of a moving picture (multimedia image). In addition, the storage medium  700  includes a PlayListMark  390  and meta data  310 , as shown in  FIG. 3 , which is a search criterion according to aspects of the present invention. The PlayListMark  390  and the PlayItems  371 ,  372 , and  373  have been described above with reference to  FIG. 1 , and thus, need not repeated herein. 
     In order to provide various search functions according to user&#39;s choices, the meta data  310 , as shown in  FIG. 3 , includes search keyword information and location information of AV data according to a predetermined search criterion. The meta data  310  indicates an exact location of AV data with reference to the PlayItems  371 ,  372 , and  373  and the clip information  114 . Accordingly, various search functions are provided according to search information included in the meta data  310 . According to an embodiment of the present invention, the meta data  310  is included in the PlayListMark  390 . 
     Referring to  FIG. 7A , the Playlist  300  includes the PlayListMark  390  and the PlayItems  371 ,  372 , and  373 . The meta data  310  for providing an enhanced search function is included in the PlayListMark  390 . 
     The PlayItems  371 ,  372 , and  373  include information for reproducing a part of AV data, as described above. 
     The PlayListMark  390  includes a mark used for chapter conversion, a mark indicating conversion timing of still images, and a mark indicating reproducing timing. Accordingly, a reproduction location of a designated timing can be searched for and identified. However, the PlayListMark  390  cannot provide searching and reproducing functions according to a user&#39;s search criterion, for example, according to scene, character, location, etc. 
     However, the meta data  310  provides an enhanced search function according to a user&#39;s search criterion, for example, according to scene, character, location, etc. In particular, according to the present invention, the meta data  310  provides specific angle information to PlayItems supporting multi-angle. The meta data  310 , which provides the enhanced search function, includes search keyword information and location information. The search keyword information is used to search for a PlayListMark  390  including meta data  310  satisfying a user&#39;s search criterion. If a PlayListMark  390  including meta data  310  satisfying a user&#39;s search criterion is detected, a location of the corresponding AV data can be detected with reference to location information included in the PlayListMark  390  so that the AV data can be reproduced. If the meta data  310  according to the present invention contains specific angle information, a location of AV data corresponding to the angle information can be detected so that the AV data can be reproduced. 
       FIG. 7B  shows a syntax structure of a PlayListMark based on the format shown in  FIG. 7A . Referring to  FIG. 7B , the PlayListMark  390  includes “number_of_Playlist_marks” information indicating the number of PlayListMarks defined in a Playlist  300 , as shown in  FIG. 7A , and “length” information indicating the data length of each PlayListMark  390 . 
     Each PlayListMark  390  includes a search keyword “mark_type” to be compared with a predetermined search condition, and meta information “meta_information” representing a search keyword value related to the search keyword of meta data and/or additional information related to the search keyword, which are search keyword information  710  for providing an enhanced search function. 
     In addition, each PlayListMark  390  also includes a PlayItem identifier “ref_to_PlayItem_id” and time stamp data “mark_time_stamp”, which are location information  720  for detecting a corresponding location from AV data, according to the searched result. 
     Accordingly, if a specific search condition is received from an external source (for example, if a user inputs a predetermined search condition), an reproducing apparatus according to the present invention searches for a mark corresponding to the received search condition with reference to meta data  310  included in a PlayListMark  390 . If a mark satisfying the received search condition is found, the reproducing apparatus finds a corresponding location in a clip storing AV data, using a PlayItem identifier and time stamp data which are location information of the searched mark, and reproduces the AV data from the corresponding location. 
       FIG. 8A  shows an example format in which the PlayListMark  390  is separated from the meta data  310  according to another embodiment of the present invention. 
     Referring to  FIG. 8A , a storage medium  800  according to an embodiment of the present invention includes also clips  380  including a clip AV stream  112  and clip information  114 , and a Playlist  300  including PlayItems  371 ,  372 , and  373  similar to the embodiment described with reference to  FIG. 7A . However, the PlayListMark  390  and the meta data  310  are independently defined, differently from the embodiment shown in  FIG. 7A . That is, the meta data  310  is recorded in the Playlist  300 , independently from the PlayListMark  390 . Each meta data item included in the meta data  310  indicates an exact location in AV data with reference to a PlayItem identifier and clip information  114  of PlayItems  371 ,  372 , and  373 , as described above. 
     Referring to  FIG. 8A , the Playlist  300  includes the PlayListMark  390  and PlayItems  371 ,  372 , and  373 . Also, the meta data  310  for providing an enhanced search function is included in the Playlist  300 , independently from the PlayListMark  390 . 
     The PlayListMark  390  and the PlayItems  371 ,  372 , and  373  have been described above with reference to  FIG. 1 , and thus, need not be repeated herein. 
       FIG. 8B  shows example meta data based on the format shown in  FIG. 8A . Referring to  FIG. 8B , “MetaInformation” is defined as an example data structure for implementing meta data  310 . In the data structure “MetaInformation”, a term “item” is used as a unit representing a search object constructing the meta data  310 . 
     The data structure “MetaInformation” includes “number_of_Playlist_item” information representing the number of all meta data items defined in a Playlist, and “length” information representing the length of each meta data  310 . 
     Each meta data item included in the meta data  310  includes a search keyword “item_type” to be compared with a predetermined search condition, meta data “MetaInfo” representing a search keyword value related to the search keyword of meta data and/or additional information related to the search keyword, and length information “MetaInfo_length” representing the length of the meta data, which are search keyword information  810  for providing an enhanced search function. In addition, each meta data item included in the meta data  310  also includes a PlayItem identifier “ref_to_PlayItem_id” and time stamp data “mark_time_stamp” which are location information for detecting a corresponding location from AV data, according to the searched result. 
     When a meta data item included in the meta data  310  satisfying a search condition received from a user is searched for, according to the format in which meta data  310  is included in PlayListMarks  390 , as shown in  FIGS. 7A-7B , all PlayListMark data is searched for. However, according to the format in which meta data  310  is recorded separately from PlayListMarks  390 , as shown in  FIGS. 8A-8B , only meta data  310  recorded independently is searched for, resulting in enhanced search efficiency. 
     Also, by defining a separate meta data structure, many limitations which may occur when a field for recording meta data is added to a conventional PlayListMark structure, can be removed. 
     As described above, a storage medium according to aspects of the present invention can include a plurality of meta data which provide a search criterion of AV data to search for the location of AV data satisfying a predetermined search condition and reproduce the AV data. Accordingly, it is possible to provide an enhanced search function according to various search criteria. Also, such a storage medium can be easily inserted into and removed from a reproducing apparatus, and is preferably an optical disc from which data can be read through an optical device of a reproducing apparatus. For example, the storage medium may be an optical disc, such as CD-ROM and DVD. 
     Hereinafter, an example reproducing apparatus for reproducing a storage medium including meta data having the data structure described with reference to  FIG. 3 ,  FIG. 4 ,  FIG. 5 ,  FIG. 6 ,  FIGS. 7A-7B , and  FIGS. 8A-8B  will be described. 
       FIG. 9  is a schematic block diagram of a reproducing apparatus  900  according to an embodiment of the present invention. Referring to  FIG. 9 , the reproducing apparatus  900  includes a reader  920 , a buffer unit  930 , a search unit  940 , and a reproducing unit  950 . 
     The reader  920  reads AV data and at least one meta data  310 , as shown, for example, in  FIG. 3 ,  FIGS. 7A-7B , and  FIGS. 8A-8B , from a storage medium  910  according to the present invention. 
     The buffer unit  930  temporarily stores the AV data and the meta data  310  read from the reader  920  and transfers the stored data to the reproducing unit  950 . However, such a buffer unit  930  may not be required, when the performance of the reader  920  is high enough not to require buffering. 
     The search unit  940  detects the location of AV data satisfying a predetermined search condition received from an external source with reference to the meta data  310 , from the storage medium  910  including a plurality of meta data providing a search criterion of AV data. 
     That is, the search unit  940  receives the meta data  310  from the reader  920 , compares a predetermined search condition received from an external source with search keyword information included in the received meta data  310 , and transfers location information of AV data included in a meta data item included in the meta data  310  or a PlayListMark  390  satisfying the search condition to the reproducing unit  950 . In particular, according to the present invention, the search unit  940  performs extended search on the AV data according to angle information included in the meta data  310 , and transfers the searched location information related to the AV data to the reproducing unit  950 . 
     The reproducing unit  950  reproduces AV data of a corresponding region on the basis of the searched location information of the AV data or the meta data item included in the meta data  310  received from the search unit  940 . 
     Hereinafter, a method for reproducing the storage medium including the meta data according to the present invention will be described. 
       FIG. 10  is a flowchart of an example reproducing method according to an embodiment of the present invention. Referring to  FIG. 10 , a predetermined search condition is received to reproduce a storage medium (for example, storage medium  910 , shown in  FIG. 9 ) including meta data  310  providing an enhanced search function (operation  1010 ). Then, the location of AV data satisfying the search condition is searched according to angle information included in the meta data  310 , from the storage medium  910  including at least one meta data  310  used for searching for AV data and a location of AV data satisfying a predetermined search condition (operation  1020 ). Then, the AV data is reproduced from a location of AV data satisfying the search condition (operation  1030 ). 
     Meanwhile, example embodiments of an extended search method according to the present invention can be written as a computer program and can be implemented in a general digital computer that executes the computer program using a computer readable medium. Codes and code segments constructing the computer program can be easily induced by computer programmers in the art. Also, the program is stored in a computer-readable media and read and executed by computers, thereby implementing the extended search method. Examples of the computer readable medium include magnetic storage media (e.g., ROM, floppy disks, hard disks, etc.), optical recording media (e.g., CD-ROMs, DVDs, etc.), and storage media such as carrier waves (e.g., transmission through the Internet). The computer readable medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. 
     As described above, according to the present invention, there are provided a storage medium including meta data providing various enhanced search functions related to moving picture data supporting multi-angle, and a reproducing apparatus and method for reproducing the storage medium. That is, by defining meta data scenes and defining various search keywords, an entry point, and duration for each scene, to perform extended search on moving picture data supporting multi-angle, an enhanced search function using various search keywords can be provided. Furthermore, by defining angle numbers for distinguishing a plurality of angles according to scene, it is possible to provide a search keyword according to an angle and provide an enhanced search function in a multi-pass title composed of a plurality of angles. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention. For example, any computer readable media or data storage devices may be utilized, as long as meta data is included in the PlayList in the manner shown in  FIG. 3 ,  FIGS. 7A-7B , and  8 A- 8 B. In addition, meta data can also be configured differently as shown in  FIG. 3  or  FIG. 4 . Moreover, a reproducing apparatus as shown in  FIG. 9  can be implemented as part of a recording apparatus, or alternatively a single apparatus for performing recording and/or reproducing functions with respect to a storage medium. Similarly, the CPU can be implemented as a chipset having firmware, or alternatively, a general or special purposed computer programmed to perform the methods as described, for example, with reference to  FIG. 10 . Accordingly, it is intended, therefore, that the present invention not be limited to the various example embodiments disclosed, but that the present invention includes all embodiments falling within the scope of the appended claims.