KR20050033100A - Information storage medium storing search information, jump and reproducing method and apparatus of search item - Google Patents

Abstract

An information storage medium recording search information, a mobile reproducing method and a reproducing device between search items are provided to search various AV data, and to easily move between search items, thereby realizing a convenient user interface. Meta information is used to search for AV data. The meta information includes presentation time information of the AV data. The meta information includes search information in accordance with a kind of scenes and search information in accordance with characters. The meta information is included in a playlist mark which is a set of marks that indicate particular positions of clips corresponding to playlists, play units of the AV data.

Description

Information storage medium storing search information, jump and reproducing method and apparatus of search item}

The present invention relates to an information storage medium recording search information, a method for reproducing and reproducing AV data corresponding to a search result that matches a user's search condition.

In a playback device that plays back an information storage medium such as a DVD, a unit that can jump and play back AV data during playback is a chapter. That is, it does not provide a method or a user operation that can arbitrarily jump to a desired part. In other words, the user interface related to the search is inconvenient because it does not provide a search function and a moving function such as performing scene unit search or character unit search and jumping and playing AV data corresponding to the searched item. have.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an information storage medium recording search information, a method of reproducing and reproducing AV data corresponding to a search result corresponding to a search condition of a user.

In order to achieve the above object, the information storage medium according to the present invention comprises: AV data; And meta information used to retrieve the AV data, wherein the meta information includes presentation time information of the AV data.

The meta information preferably includes search information according to the type of scene and search information according to the characters.

Preferably, the meta information is included in a play list mark, which is a set of marks indicating a specific position of a clip corresponding to a play list that is a reproduction unit of the AV data.

The meta information is preferably recorded separately from the play list mark, which is a set of marks indicating a specific position of a clip corresponding to the play list which is a reproduction unit of the AV data.

In order to achieve the above object, according to the present invention, a method for reproducing AV data while moving between search items includes: (a) providing a search item that satisfies a desired search condition by searching for meta information recorded with search information; (b) reproducing AV data corresponding to the search item selected by the user among the search items, and storing presentation time information of the AV data; And (c) receiving a command to move to a next search item or a previous search item during playback of the AV data, comparing the presentation time information of the search item with the stored presentation time information and, according to the result, the AV data. Find and jump to play.

In order to achieve the above object, according to the present invention, a device for reproducing AV data while moving between search items includes: a search engine unit for searching for meta information recorded with search information and outputting a search item satisfying a desired search condition; A playback unit for reproducing AV data corresponding to the search item selected by the user among the search items; And a time information storage unit for storing presentation time information of the selected search item, wherein the playback unit, when receiving the command to move to a next search item or a previous search item during playback of the AV data, presenting the search item. The presentation time information is compared with the stored presentation time information, and the AV data is found and jumped and reproduced according to the result.

In order to achieve the above object, the present invention provides a computer-readable recording medium recording a program for executing the method on a computer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1C illustrate correlations between PlayList, PlayListMark, meta information, PlayItem, Clip Information, and Clip. Hereinafter, in order to explain the reproduction of the AV data satisfying the search condition specified by the user while jumping according to the user's selection, the position where the meta information exists will be described first.

The information storage medium reproduced in the playback apparatus of the present invention includes AV data and meta information, and provides an improved search function by using the meta information. The recording unit of AV data is Clip, and the playback units are PlayList and PlayItem. PlayListMark indicates a specific position of a clip corresponding to PlayList. In this case, the clip corresponds to a cell, which is a recording unit, as compared with a conventional DVD, and PlayList and PlayItem have the same concept as a program and a cell, which are playback units. In other words, the AV data is recorded in the information storage medium in units of clips. Generally, clips are recorded in consecutive spaces. In order to reduce the size of the AV data, it is compressed and recorded. Therefore, in order to reproduce the data, characteristic information of the compressed AV data must be known.

The characteristic information of the AV data is recorded in the Clip Information area for each clip. In this Clip Information, an entry point map and the like in which audio / video attribute information of each clip and matching information with a presentation time stamp (PTS) indicating time information at which each clip is played are recorded. In the case of MPEG, which is widely used as a video compression technique, the entry point is the position of an I picture where intra video compression is performed, and the entry point map is mainly used for a time search for a point where some time has elapsed since playback starts. . The PlayList is a basic unit of reproduction, and at least one PlayList is stored in the recording medium. One movie may consist of one PlayList or may consist of several PlayLists. In this case, meta information (MetaInformation) is included in the above-described PlayListMark or recorded in a separate space from PlayListMark.

Referring to FIG. 1A, meta information may be included in text-based data such as Text Subtitle. Alternatively, as can be seen with reference to FIG. 1B, it can be seen that it can be included in a PlayListMark or as shown in FIG. 1C and can be included in a separate space in binary form.

One PlayList consists of a PlayListMark indicating a specific position of a video stream, meta information contained in a PlayListMark for providing an improved search function or recorded in a separate recording space, and a plurality of PlayItems. PlayItem specifies a part of a clip. Specifically, a play start time (IN_time) and an end time (OUT_time) within a clip are specified. Accordingly, the position of the corresponding part in the actual clip is found by using the Clip Information. General AV data is reproduced in PlayList units, and is reproduced in the order of PlayItems listed in the PlayList.

Therefore, it is possible to change the position of playback by moving to a specific position of the AV data using PlayListMark. In addition, as described above, the meta information is included in various ways so that the playback position can be changed to a specific scene that matches the search condition specified by the user during playback of the AV data.

FIG. 2A is a diagram for explaining the search and retrieval of the position of AV data meeting the user's search condition when meta information is included in the PlayList.

Referring to FIG. 2A, when meta information is included in PlayListMark, each search item is called Mark. In PlayListMark, the mark for meta information is distinguished in addition to the link point used by navigation commands such as Link-MK and Skip point to indicate the transition point of still images in application examples such as chapter-mark for chapter classification, browser slide show, etc. Various Marks may be included. However, FIG. 2A illustrates a case in which Chapter_mark and Scene_mark are used.

When playing back the information storage medium in which PlayListMark is defined, enter the search condition such as Mark_type = Scene_mark, Desc = "Dental Clinic" through the menu for advanced search provided by the playback device or the maker of the information storage medium. In this case, the search engine unit that searches in the playback device compares Mark_type and meta information in each Mark of the PlayListMark to find Mark 1, Mark 4, and Mark 5 that match the specified search condition. Next, the searched result is provided to the user, and when the user selects playback of Mark 1 from among the searched results, the clip corresponding to PTS i in PlayItem 0 is played by the reference PlayItem value and mark_time_stamp value of Mark 1. At this time, the playback apparatus records the Mark Number " 1 ", which records the start position information of the playback, in an arbitrary register, and updates the value of the above-described register each time a playback meets a Mark matching the specified search condition. do.

FIG. 2B is a diagram for explaining the search and playback of the position of a clip meeting the user's search condition when the meta information is recorded in a space separate from the PlayList.

2B, when the meta information is recorded separately from the PlayListMark, each search item is called an Item. Meanwhile, when meta information is additionally recorded in a file for text subtitle, items of each meta information may be defined in the same form as an element of a markup document and have a PTS value corresponding to meta information as an attribute of the corresponding element.

The meta information may include various Item_types such as a Scene_type for identifying a scene of a movie and a Character_type for identifying a character. In FIG. 2B, a case of having only Scene_type as an Item_type of each Item is described as an example of meta information. If the search condition specified by the user is Item_type = Scene_type, Desc = "Dental Clinic", the playback device compares the Item_type and the meta information in each Item included in the meta information and matches the Item 0, Item 2, and Item that match the specified search condition. If 4 is provided to the user, and the user selects playback of Item 0, the clip corresponding to PTS i in PlayItem 0 is played by the reference PlayItem value and item_time_stamp value of Item 0. At this time, the reproducing apparatus records the item number "0", which records the start position information of the reproduction, in the register. When the item_type meets the item whose Scene_type is in progress, the item number is updated and recorded in the register.

Now, in a reproducing apparatus for reproducing AV data at the PTS time point of the meta information that matches the search condition specified by the user, the functions such as NextPG_Search () and PrevPG_Search () are used for switching between chapters in the conventional DVD. The corresponding user operation will be described in detail. In order to provide such a user operation, Skip to next Enhanced Search Point () and Skip back to previous Enhanced Search Point () for switching between the retrieved meta information are defined. In this case, Skip to next Enhanced Search Point () and Skip back to previous Enhanced Search Point () are valid in the currently playing PlayList, as user operations such as NextPG_Search () and PrevPG_Search () are used in one title on the DVD. Do. However, when connection information between a plurality of PlayLists is defined, it can be effectively used even among a plurality of PlayLists.

Skip to next Enhanced Search Point () moves to the PTS time point of the meta information having the smallest PTS value among those whose PTS value of the retrieved meta information is larger than the PTS value of the meta information stored in the current register and starts playback. do. The Skip back to previous Enhanced Search Point () moves to the PTS time point of the meta information having the largest PTS value among those whose PTS value of the retrieved meta information is smaller than the PTS value of the meta information stored in the current register and starts playback. Perform the action. Hereinafter, the user operation will be described in detail with reference to FIGS. 3A to 3B.

3A is a diagram for explaining the operation of Skip to next Enhanced Search Point () when meta information is included in PlayListMark.

That is, there is shown an example of the operation when a specific input event to which the user operation of Skip to next Enhanced Search Point () occurs occurs during playback of AV data including meta information matching the search condition specified by the user. .

Referring to FIG. 3A, search conditions specified by the user are Mark_type = Scene_mark, Desc = "Dental Clinic" and Marks matching the specified search conditions are Mark 1, Mark 4, and Mark 5. If the Mark 1 is selected by the user and played from the PTS point of the Mark, when Skip to next Enhanced Search Point () user operation is received, the Mark Number currently being played in the PlayListMark recorded in the currently playing PlayList is indicated. In Marks with a PTS value greater than the PTS of Mark 1, which is the value of the register, Mark 4 and Mark that match the search condition are ignored. The start point of playback is moved to PTS l of PlayItem 1 indicated by Mark 4 having the smallest PTS of five.

When the playback device selects the next mark that matches the specified search condition, if the user has a PTS greater than the PTS of the mark corresponding to the value of the register indicating the currently playing mark number, and there is no mark that matches the search condition, the user The operation is preferably ignored.

3B is a diagram for explaining the operation of Skip to next Enhanced Search Point () when meta information is recorded separately from PlayListMark.

In this case, the search conditions specified by the user are Item_type = Scene_Item, Desc = "Dental Clinic" and the items matching the specified search conditions are Item 0, Item 2, and Item 4. When Item 0 is selected by the user and playback is performed from the PTS point of time of the item, and when a Skip to next Enhanced Search Point () user operation is received from the user, as described with reference to FIG. 3A, among the searched items, Among items with PTS value larger than the PTS of the item currently stored in the register, item 1 whose Desc value does not match is ignored and item 2 of PlayItem 1 indicated by item 2 having the smallest PTS among item 2 and item 4 which match the search condition The playback start point is shifted to PTS k.

When the playback device selects the next item that matches the specified search condition, if the user has a PTS that is larger than the item's PTS corresponding to the value of the register indicating the item number currently playing, and there is no item that matches the search condition, the user The operation is preferably ignored.

4A is a diagram for explaining the operation of Skip back to previous Enhanced Search Point () when meta information is included in PlayListMark.

That is, an operation example when a specific input event to which a user operation of Skip back to previous Enhanced Search Point (s) is assigned by the user during playback of AV data including meta information that matches the search condition specified by the user occurs. It is shown.

4B is a view for explaining the operation of Skip back to previous Enhanced Search Point () when meta information exists separately from PlayListMark.

The operation by Skip back to previous Enhanced Search Point () is similar to Skip to next Enhanced Search Point (). However, playback is performed after moving to the PTS time point of the Mark or Item having the largest PTS value among the searched Mark or Item having a PTS value smaller than the PTS of the current Mark or Item. In the process of selecting the previous Mark or Item that matches the specified search condition, if the PTS of the Mark or Item corresponding to the value of the register indicating the currently playing Mark or Item Number is smaller than the PTS of the Mark or Item, the search condition is matched. If there is no Mark or Item, the user operation is preferably ignored.

5 is a block diagram of a playback apparatus of an information storage medium having recorded therein search information according to the present invention.

The playback apparatus of the present invention can reproduce the search item searched by the user while moving, and includes a reading unit 510, a search engine unit 520, a playback unit 530, and a time information storage unit 540.

The reader 510 reads the meta information recorded in the information storage medium, that is, the Mark or Item described above. The search engine unit 520 searches the read meta information and outputs a search item satisfying a desired search condition. The reproduction unit 530 reproduces the AV data corresponding to the search item selected by the user among the search items. The time information storage unit 540 stores the presentation time information included in the selected search item.

When the playback unit 530 receives a command to move to the next search item or the previous search item during the playback of the AV data, the playback unit 530 compares the presentation time information included in the search item with the stored presentation time information. The AV data is found and played back according to the result. That is, when a command to move to the next search item is received during playback of the AV data, the playback position of the AV data is set according to the presentation time information stored in the search item having a value larger than and closest to the stored presentation time information. Play by changing. If a command to move to a previous search item is received during playback of the AV data, the playback position of the AV data is set according to the presentation time information stored in the search item having a value smaller than or closest to the stored presentation time information. Play by changing.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, when the AV data movement playback method and playback apparatus of the present invention are used, various search can be performed on the AV data, and the navigation between the search items can be easily performed. .

1A to 1C illustrate correlations between PlayList, PlayListMark, meta information, PlayItem, Clip Information, and Clip.

FIG. 2A is a diagram for explaining the search and retrieval of the position of AV data meeting the user's search condition when meta information is included in the PlayList.

FIG. 2B is a diagram for explaining the search and playback of the position of a clip meeting the user's search condition when the meta information is recorded in a space separate from the PlayList.

3A is a diagram for explaining the operation of Skip to next Enhanced Search Point () when meta information is included in PlayListMark.

3B is a diagram for explaining the operation of Skip to next Enhanced Search Point () when meta information is recorded separately from PlayListMark.

4A is a diagram for explaining the operation of Skip back to previous Enhanced Search Point () when meta information is included in PlayListMark.

4B is a view for explaining the operation of Skip back to previous Enhanced Search Point () when meta information exists separately from PlayListMark.

5 is a block diagram of a playback apparatus of an information storage medium having recorded therein search information according to the present invention.

Claims (11)

In the information storage medium recording the search information, AV data; And And meta information used to retrieve the AV data, wherein the meta information includes presentation time information of the AV data. The method of claim 1, wherein the meta information is An information storage medium comprising search information according to a scene type and search information according to a character. The method of claim 1, wherein the meta information is And a play list mark, which is a set of marks indicating a specific position of a clip corresponding to a play list which is a reproduction unit of the AV data. The method of claim 1, wherein the meta information is And a play list mark, which is a set of marks indicating a specific position of a clip corresponding to a play list which is a reproduction unit of the AV data, is recorded separately. In the method of playing the AV data while moving between search items, (a) searching for meta information recorded with search information and providing a search item satisfying a desired search condition; (b) reproducing AV data corresponding to the search item selected by the user among the search items, and storing presentation time information of the AV data; And (c) If a command to move to the next search item or the previous search item is received during the reproduction of the AV data, the presentation time information of the search item is compared with the stored presentation time information, and the AV data is determined according to the result. Finding, jumping and playing. The method of claim 5, wherein step (c) Upon receiving a command to move to the next search item during playback of the AV data, the playback position of the AV data is changed according to the presentation time information of the search item having a value larger than and closest to the stored presentation time information. To reproduce. The method of claim 5, wherein step (c) Upon receiving a command to move to a previous search item during playback of the AV data, the playback position of the AV data is changed according to the presentation time information of the search item having a value smaller than or closest to the stored presentation time information. To reproduce. An apparatus for reproducing AV data while moving between search items, A search engine unit for searching for meta information recorded with search information and outputting a search item satisfying a desired search condition; A playback unit for reproducing AV data corresponding to the search item selected by the user among the search items; And And a time information storage unit for storing presentation time information of the selected search item, wherein the reproducing unit includes: If a command to move to the next search item or the previous search item is received while playing the AV data, the presentation time information of the search item is compared with the stored presentation time information, and the AV data is found and jumped according to the result. And a reproducing apparatus. The method of claim 8, wherein the regeneration unit If a command to move to the next search item is received during playback of the AV data, the playback position of the AV data is determined according to the presentation time information stored in the search item having a value larger than and closest to the stored presentation time information. And a reproducing apparatus for changing and reproducing. The method of claim 8, wherein the regeneration unit If a command to move to a previous search item is received during the playback of the AV data, the playback position of the AV data is set according to the presentation time information stored in the search item having a value smaller than or closest to the stored presentation time information. Changing and playing back. (a) searching for meta information recorded with search information and providing a search item satisfying a desired search condition; (b) reproducing AV data corresponding to the search item selected by the user among the search items, and storing presentation time information of the AV data; And (c) If a command to move to the next search item or the previous search item is received during the reproduction of the AV data, the presentation time information of the search item is compared with the stored presentation time information, and the AV data is determined according to the result. A computer-readable recording medium having recorded thereon a program for executing the method of reproducing AV data while moving between search items, the method comprising finding and jumping and playing.