JP2006236504A - Information recording and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and reproducing method capable of easily creating and editing a play list. <P>SOLUTION: At least one book mark is made in a video voice stream at the time of reproducing and recording, also, it is discriminated whether the book mark is specified at the time of recording or it is specified at the time of reproducing. When reproduction is performed from one of the book mark in the video voice stream and it is discriminated as the book mark made at the time of recording, reproduction is performed from a position prescribed quantity before a position shown by the book mark. Thereby, since the book mark of the video voice stream can be set by operation such as reproduction, reverse reproduction, frame-by-frame reproduction/reverse reproduction, play list can be edited easily. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information recording / reproducing method for recording and reproducing video or audio on a recording medium such as an optical disk.

  2. Description of the Related Art In recent years, disk recording / reproducing apparatuses that record and reproduce video and audio on a disk recording medium such as a DVD have become widespread, and video and audio recorded by a user can be edited according to needs. For example, the order of video files at the time of playback and the playback section in the video file are recorded on the optical disc together with the video file as a playlist. Therefore, it is possible to continuously reproduce a plurality of video files in an arbitrary section and an arbitrary order. Also, by editing the playlist, simple editing according to the user's needs is possible.

  As shown in FIG. 4, when editing a video file in an editing operation, video A, video B, and video C are set to arbitrary IN points, IN_A, IN_B, IN_C, and OUT points, OUT_A, OUT_B, and OUT_C, respectively. , B, and C, a playlist is created so that continuous playback is performed.

When setting an edit point (IN point, OUT point) in the video / audio stream, if there is a bookmark in the video / audio stream, a desired position can be designated from the bookmark position, which is convenient for editing. When creating a bookmark, a video / audio stream is reproduced and a desired position is registered as a bookmark. In the bookmark, when a video / audio stream is reproduced, a predetermined position in the video / audio stream is designated in units of frames or GOPs, and reproduction is performed from the designated position of the bookmark. Such a technique is described in, for example, Japanese Patent Application Laid-Open No. 2000-57751 (Patent Document 1).
JP 2000-57751 A

  In the above editing work, when the user sets a desired editing point, it is necessary to search the stream from the beginning, which takes time, so that bookmarks can be registered even during recording. It is possible to move to the registered predetermined position. However, since bookmarks created during data recording are registered after viewing the video during recording, the bookmark creation position is registered after the desired position. For this reason, when a bookmark position is referred to when creating a play list, it is necessary to search a position just before the designated position by the bookmark created at the time of recording, and the user needs to detect a desired position.

  An object of the present invention is to provide an information recording / reproducing method capable of easily creating and editing a playlist.

  In order to solve the above problems, the present invention provides an information recording / reproducing method for recording / reproducing video or audio on an information recording medium, wherein at least one bookmark is created in a video / audio stream during reproduction and recording, and the bookmark is recorded. It is discriminated whether it was specified at the time or at the time of playback, and when it is determined from the bookmark created at the time of playback from one of the bookmarks in the video / audio stream, the bookmark indicates The reproduction is performed from a position a predetermined amount before the position.

  In the present invention, it is determined whether the bookmark is specified at the time of recording or at the time of playback, and if it is determined as a bookmark created at the time of recording, the bookmark is determined from a position a predetermined amount before the position indicated by the bookmark. By playing, it is possible to set a bookmark of the video / audio stream by operations such as playback, reverse playback, frame advance / return, etc., so that playlist editing is facilitated.

  According to the present invention, a bookmark can be created even during recording, a bookmark created during data recording is distinguished from a bookmark created during playback, and when a bookmark registered during data recording is played back, By playing back a predetermined amount before the bookmark position, bookmarks of the video / audio stream can be set by operations such as playback, reverse playback, frame advance / return, etc., so that playlist editing becomes easy.

  In addition, if a bookmark created during data recording is changed, the bookmark can be quickly created at the desired position by playing from the location indicated by the bookmark instead of before the location indicated by the bookmark. Easy list editing.

  Next, the best mode for carrying out the invention will be described in detail with reference to the drawings. First, GOP (Group of Picture), which is a coding unit in which image signals of a plurality of screens in the MPEG standard are grouped, will be described.

  This GOP has a structure as shown in FIG. FIG. 5 shows, for example, a case where 15 screens are set to 1 GOP, and an image signal of one GOP is generated without using inter-frame prediction (hereinafter referred to as I picture). Inter-frame forward prediction coding screen (hereinafter abbreviated as P-picture) generated using forward (front) inter-frame prediction with an I picture or P picture located in the previous (past), It is composed of each signal of a bi-directional predictive coding screen (hereinafter abbreviated as B picture) generated using bi-directional prediction using an I picture or P picture located later (past and future) as a reference screen. . These three types of screens (pictures) are recorded on the disc as a structure in which some are combined.

  Further, the I picture (plane), P picture (plane), and B picture (plane) constituting the GOP have the following properties. In other words, since the I picture is generated by performing DCT (Discrete Cosine Transform) within the frame, it is possible to reproduce the image without referring to other pictures on this screen alone. Since the P picture is encoded by performing motion compensation with reference to the screen in the forward direction, the image cannot be reproduced unless the I picture is decoded. Since it is a prediction screen, an image cannot be reproduced unless the preceding and following I or P pictures are decoded.

  Therefore, if encoding is performed so that a B picture to be encoded with reference to another picture is closed in one GOP, that is, a reference screen of the B picture refers to a screen in the GOP, 1 One GOP image signal can be decoded and reproduced by itself.

  On the other hand, the B picture encoded by performing prediction from both directions has the smallest data amount and good encoding efficiency, but on the other hand, this B picture cannot be reproduced alone and requires an I picture or a P picture. Therefore, if the number of B pictures is increased accordingly, the amount of buffer memory required for processing increases, and the delay time associated with encoding and decoding increases. However, in storage media represented by optical discs and the like, an encoding method with high compression efficiency is desired for long-time recording, and the delay time of the image reproduction is not a problem. A suitable encoding method is suitable.

  Next, an embodiment of the present invention will be described. FIG. 2 is a diagram showing a configuration example of a bookmark table provided on the disc. This disc has a bookmark table as shown in FIG. This bookmark table can store m bookmarks, and each piece of information is information related to the playback start position on the disc designated by the user, and usually the time corresponding to the disc address information. The information equivalent is used.

  FIG. 3 shows a specific example of a bookmark. A thumbnail number 31 is a thumbnail number of a thumbnail generated at the time of bookmark registration. The number of bookmarks that can be recorded on the disc is a predetermined number (for example, a maximum of 256). The position information 32 is time information indicating the recording position of the bookmark on the recording medium, and corresponds to the disk address of the data.

  The status flag 33 indicates the status when the bookmark is created. If it was created during data recording, the status flag is set to 1, and if it was created during data playback, the status flag is set to 0. When a bookmark created during data recording is changed during data reproduction, the status flag is set to zero. The creation date and time 34 records the date and time when the bookmark is created, and the thumbnail information 35 records the thumbnail information generated when the bookmark is created.

  FIG. 1 is a block diagram showing an embodiment of an information recording / reproducing apparatus according to the present invention. In the figure, reference numeral 1 denotes a disk which is an information recording medium. 2 is a spindle motor for rotating the disk 1, 3 is a motor control means for controlling the drive rotation of the disk motor 2, 4 is information recorded on the disk 1 such as video data or data recorded, information such as addresses is reproduced The information recording / reproducing head 5 is an address decoding means for reading a sector address signal from the information recording / reproducing head 4 and outputting an address decoding signal obtained by converting the sector address signal into a sector address value.

  6 records and outputs the recording data after modulation to the information recording / reproducing head 4 at the time of recording, and at the time of reproduction recording / reproducing means for reading out and demodulating the reproduction signal from the information recording / reproducing head 4, and 7 for recording / reproducing means for encoding the input video signal. 6 is a video signal encoding / decoding unit for decoding video information from the recording / reproducing unit 6 and outputting the decoded video information to an output user interface unit 10 which will be described later. Is a memory for temporarily storing at the time of recording or reproduction, and has a capacity for registering bookmarks.

  Reference numeral 9 denotes an input user interface unit that notifies the device of recording and playback start and end from the user, and an arbitrary playback start position. Reference numeral 10 denotes an output user interface unit that displays a video signal to the user. Reference numeral 11 denotes a controller that controls each part of the device. It is. The bookmark is registered through an input interface such as a remote controller while the user is reproducing or recording the video.

  When the disc 1 is inserted into the apparatus main body, the bookmark table recorded in a predetermined area on the disc 1 is read. The controller 11 reads the information of the address position where the bookmark table is recorded through the recording / reproducing means 6. The obtained information is stored in the memory 8. Subsequent operations relating to the table are performed using the data in the memory 8.

  During the operation of the apparatus, a new bookmark is registered and updated in the memory 8. In this case, in order to maintain consistency with the position information registered on the disk, the user 8 is updated every certain time interval. The information recorded in the memory 8 is updated to the table information on the disk 1 at a predetermined timing immediately before the apparatus is turned off or when the disk is taken out.

  In this way, it is possible to prevent the seek, read, and write processes of the disk 1 from occurring as compared to updating the disk 1 each time a bookmark is newly registered or updated. The burden can be reduced.

  Next, the operation at the time of data recording of the present embodiment will be described with reference to the flowchart shown in FIG. First, in S601, it is determined whether or not a mode dial (not shown) on the input interface 9 is set to the recording mode. If the recording mode is set, a recording start button (not shown) on the input user interface 9 is determined in S602. It is determined whether or not is pressed. If the recording start button has been pressed, it is determined in S603 whether or not the bookmark key has been pressed during the recording operation. If the bookmark key has been pressed, it is determined in S604 whether the number of bookmarks that can be stored in the bookmark table has been reached.

  If it can be stored in the bookmark table, the process proceeds to S605, and the position information 32 of the data when the bookmark key is pressed, the status flag 33, the creation date and time 34, and the thumbnail and the number of thumbnails corresponding to the bookmark position of the video / audio stream are displayed. The thumbnail number shown is created as a bookmark and registered in the bookmark table. After that, it waits for the bookmark key to be pressed in S603. If the number of bookmarks that can be stored in the bookmark table is reached in S604, the process proceeds to S606, and an error display such as “cannot be registered any more” is displayed on the LCD of the output user interface 10.

  Next, the operation at the time of data reproduction according to the present embodiment will be described with reference to the flowchart shown in FIG. First, in S701, it is determined whether or not a mode dial (not shown) on the input user interface 9 is set to the reproduction mode. When the playback mode is set, the bookmark table is read and a thumbnail list is displayed on the LCD of the output user interface 10 (S702). In step S703, a thumbnail to be reproduced is selected from a thumbnail list on the LCD using a cross key (not shown). When a thumbnail is selected in S703, it is determined whether or not a bookmark is created during recording and the bookmark is not changed during playback with reference to the status flag 33 in S704 (the status flag is 1).

  If the status flag 33 is set to 1, it is determined that the bookmark created at the time of recording has not been changed, and the process proceeds to S705, where a predetermined amount before the position represented by the bookmark in the video / audio stream, that is, in advance Playback is started before the bookmark position by the set number of frames, number of GOPs, or time (S705). On the other hand, if the status flag is not set to 1 in S704, it is determined that the bookmark created at the time of recording has been changed, and reproduction is started from the position represented by the bookmark (S706).

  As described above, by referring to the bookmark status flag 33 and changing the playback start position according to the value of the status flag 33, playback from a desired position and playlist editing are facilitated.

  Next, an operation for changing a bookmark according to the present embodiment will be described with reference to a flowchart shown in FIG. First, in S801, it is determined whether or not the bookmark change mode is set. When the bookmark change mode is set, the thumbnail list read from the bookmark table is displayed on the LCD of the output user interface 10 (S802).

  In step S803, a thumbnail corresponding to the bookmark to be changed is selected from a thumbnail list on the LCD using a cross key (not shown). Also, the image at the thumbnail position selected in S803 is displayed, and after that, the desired bookmark position is designated by operations such as playback, reverse playback, frame advance / return (S804), and the bookmark key is pressed and confirmed in S805. Determine whether or not. In step S805, the process waits until the bookmark key is pressed. If the bookmark key is pressed in step S805, the process advances to step S806, the bookmark position is updated to the address, and the status flag 33 is set to 0. End the change. This facilitates bookmark editing operation.

  As described above, when a bookmark created at the time of recording is changed, a bookmark can be quickly created at a desired position by playing from the location indicated by the bookmark instead of before the location indicated by the bookmark, and the playlist can be edited. It becomes easy.

It is a figure which shows one Embodiment of the information recording / reproducing apparatus which concerns on this invention. It is a figure which shows the structural example of the bookmark table used by embodiment of FIG. It is a figure which shows the structural example of the bookmark used by embodiment of FIG. It is a schematic diagram showing a video file and a play list. It is a structural diagram which shows the structure of GOP of the encoding method by MPEG system. 2 is a flowchart for explaining an operation at the time of data recording in the embodiment of FIG. 1. 2 is a flowchart for explaining an operation at the time of data reproduction in the embodiment of FIG. 1. It is a flowchart for demonstrating the operation | movement which changes the bookmark of embodiment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc 2 Spindle motor 3 Motor control means 4 Information recording / reproducing head 5 Address decoding means 6 Recording / reproducing means 7 Video signal encoding / decoding means 8 Memory 9 Input user interface 10 Output user interface 31 File number 32 Address information 33 Status flag 34 Creation date

Claims (5)

In an information recording / reproducing method for recording / reproducing video or audio on an information recording medium, at least one bookmark is created in a video / audio stream during reproduction and recording, and the bookmark is designated at the time of recording or designated at the time of reproduction. If it is determined that it is a bookmark created at the time of recording when it is reproduced from one of the bookmarks in the video / audio stream, it is reproduced from a position a predetermined amount before the position indicated by the bookmark. An information recording / reproducing method characterized by the above. The information recording / reproducing method according to claim 1, wherein the predetermined amount is specified in frame units or GOP units. The information recording / reproducing method according to claim 1, wherein the predetermined amount is specified in a time unit corresponding to the number of GOPs. 2. The information recording / reproducing method according to claim 1, wherein the position indicated by the bookmark is a leading I picture of a GOP. 2. The information recording / reproducing method according to claim 1, wherein a bookmark created at the time of recording is changed to a bookmark created at the time of reproduction.

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