JP2004282411A - Static image recording and reproducing method and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of less consideration on complexity of PTS synchronization of a MPEG decoder when a large quantity of static images is recorded and time information independent for each static image is recorded, and a problem of less consideration on a method for setting freely the order of display or display time in a method for continuously reproducing two or more static images, especially in automatic reproduction. <P>SOLUTION: PTS recorded in each static image data is made into a time duration corresponding to a play list, so automatic reproduction, in which a display time is set, in order of the play list is realized through regular reproduction without operating the MPEG decoder in a complicated way. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for recording data on a medium, such as an optical disk or a memory card, which is necessary for controlling a reproduction order of still image data and a reproduction display time on the medium.
[0002]
[Prior art]
Conventionally, magnetic tapes have been mainly used as recording media for recording video data, but in recent years, as seen in DVDs, due to the increase in the capacity of optical discs and the development of standards for both AV and PC use, And audio data are recorded and reproduced on optical discs. As the video data, data obtained by encoding moving image data described in the ISO / IEC11172 standard, the ISO / IEC13818 standard, or the like by an MPEG (Moving Picture Experts Group) method or the like is generally used. As still image data, MPEG intra-frame encoded data (I picture) and data encoded by the JPEG scheme described in the ISO / IEC 10918-1 standard are generally used.
[0003]
An optical disk is different from a magnetic tape in that it has a random access characteristic, and it is possible to access recorded data in an order different from the order in which it was recorded, and to reproduce data seemingly continuously. In addition, the increase in the capacity of the optical disk also increases the amount of video data that can be recorded. Particularly, in the case of a still image, a large number of images can be recorded. However, on the other hand, information about recording and information on reproduction control also increase, so that a DVD is devised as in Patent Document 1.
[0004]
[Patent Document 1]
JP-A-2000-134565 (FIGS. 1, 3, and 8)
[0005]
[Problems to be solved by the invention]
However, conventionally, when a large number of still images are recorded, it has not been considered that recording of independent time information in each still image complicates PTS synchronization of an MPEG decoder. In addition, a method of continuously reproducing a plurality of still images, particularly, an automatic reproduction, and a method of freely setting a display order and a display time are not considered.
[0006]
[Means for Solving the Problems]
Therefore, according to the present invention, a still image recording method for recording a still image on a recording medium, wherein a still image stream file in which a plurality of still images are continuously recorded, and a playlist file for specifying a reproduction order of the still images And the still image display start time and the display end time in the playlist file are set to desired display times, and each still image data of the still image stream file includes a display start time. The display start time of the still image is recorded in accordance with the set display time of the still image.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a recording method according to the present invention will be described with reference to the drawings.
[0008]
FIG. 2 shows a reproduction method using a playlist for automatically and continuously reproducing a designated still image according to an embodiment of the present invention.
[0009]
When the intra-frame encoded data (I picture) of the MPEG system is continuously played back as still image data, a plurality of still image data (Still pictures) recorded as a clip (still image stream file) 203 are recorded on the disk. It is assumed that these are reproduced in an arbitrary order determined by the user.
[0010]
Each still image data is set to be reproduced in the order of Still Picture A 211, Still Picture B 212, and Still Picture C 213. Each of these still image data includes playback output time management information PTS (Present Time Stamp). At the time of encoding, a value that is increased by 1/30 second at the time of encoding is written in the PTS.
[0011]
The PlayList file contains a plurality of PlayItems, which are played back in order. Here, one of the PlayItems 201 is taken as an example, but there may be a plurality of PlayItems. For example, FIG. 3 shows a configuration of PlyList when displaying a plurality of PlayItems (1) to (n). In FIG. 2, a PlayItem 201 describes a playback start time on a stream of still image data to be played back as IN_time 204, and a playback end time OUT_time 205 corresponding to the playback start time. For example, when Still Picture A 211 is displayed for 5 seconds, normally, IN_time 204: 0 seconds and OUT_time 205: 5 seconds. The EP_map 202 is a conversion table for converting a packet number spn (Source Packet No.) on the disc with respect to the time information written in the IN_time 204, and each of the spns 206 to 210 corresponds to a Still Picture disc corresponding to each. Specify the starting sector number in. As a result, according to the time information written in the IN_time 204 of the PlayItem 201, the data can be converted into spn and the still image data can be reproduced. Here, the PTS written in Still Picture A 211 is normally a value indicating a decoding timing, but is rewritten and recorded according to a continuous display time in automatic reproduction. In addition, the time information written in the IN_time 204 is similarly rewritten according to the continuous display time. Next, the value of the time information according to the display time will be described.
[0012]
FIG. 1 is a view for explaining data reading of a PlayItem and a flow of time for automatically and continuously reproducing a still image at a predetermined time according to an embodiment of the present invention. In MPEG, reproduced data is output when an internal STC (System Time Clock) of a system reference decoder synchronizes with a PTS. Therefore, in order to reproduce the designated still image data, the time information included in the IN_time is converted into spn, the still image data is read by accessing the disk, decoded, and output. At this time, since the decoded data is output in synchronization with the system time, the PST included in Still Picture must have a time corresponding to the display time. For example, when the still image data of the clip 104 is read, the start / end position of the Still picture A 105 is obtained as spn from the time information of IN_time (1) and OUT_time (1) written in 101 using EP_map, and the still picture A 105 Is displayed. Here, 0 second is written in IN_time and 5 seconds are written in OUT_time, so Still Picture A 105 is displayed for 5 seconds. Similarly, Still picture B 106 is displayed for 10 seconds by IN_time and OUT_time written in IN_time (2) 102, and Still picture C 107 is displayed for 3 seconds by IN_time and OUT_time written in IN_time (3) 103. At this time, the time information included in each IN_time (1), (2), and (3) is 0, 5, and 15 seconds. As a result, the still picture A 105 is first decoded and output in synchronization with the start of 0 second, and the same still picture A 105 is displayed as a still image for 5 seconds (Duration (1)), during which time the next still picture B 106 is displayed. Decode, output in synchronization with 5 seconds of PTS, display the same Still picture B 106 as a still image for 10 seconds (Duration (2)), decode the next Still picture C 107 during that time, and synchronize with 15 seconds of PTS Output. Therefore, the PTS in each of the still pictures A to C and the PTS written in each of the IN_time (1) to (3) are rewritten as new PTSs that match the display time. This enables the decoder to output still image data in accordance with the display time.
[0013]
The graph shown at the bottom of FIG. 1 shows the transition of the display time (vertical axis) with respect to the reading of the still image data (horizontal axis). Since PTSs (1) to (3) are rewritten according to the display time, the decoder can output still image data according to the display time. If the PTS is not rewritten, the display time will exceed the PTS time, and the decoder cannot correctly output still image data in synchronization with the PTS.
[0014]
FIG. 4 shows a configuration example of a recording / reproducing system for realizing the present invention described above.
The recording / reproducing system may be configured as dedicated hardware, or may be configured to control general-purpose hardware such as a personal computer by a program described later. In either case, the system control unit 409 controls the entire system. First, after receiving an operation instruction from the user via the operation unit 410, the system control unit 409 performs operation control on each unit described later. At the time of recording, a signal such as an image and a sound is input from the input unit 401, and the encoder 402 performs encoding such as an MPEG method. Encoded data such as moving images, still images, and audio are input to the drive 404 via the track buffer 403 and recorded on the recording medium 405. Since it is difficult to rewrite the PTS during the period when the encoded data is recorded in real time, the PTS written in the still image data is rewritten using the display control memory 406 and after the recording of the encoded data is completed. Control is performed so as to record on the recording medium 405. On the other hand, at the time of reproduction, after the still image data is read from the recording medium 405 by the drive 404, the encoded data is read based on the information and input to the track buffer 403. The encoded data from the track buffer 403 is decoded by the decoder 407 and output from the output unit 408.
[0015]
FIG. 5 shows an example of data arrangement when data according to this recording method is recorded on an optical disk. Reference numeral 501 denotes an optical disk; 502, a still image stream file; and 503, a playlist file. A file is recorded as recording data on a spirally or concentrically provided track on the optical disk 501. As the recording data on the disc, the still image stream file 502, the playlist file 503, and the like described above are recorded. On an optical disc, data is recorded as uneven pits or dark and light dots made of a phase change material or the like. As described above, the still image stream file is recorded on the disc as continuous data, and is read out as continuous data by an optical pickup (not shown).
[0016]
【The invention's effect】
As described above, according to the present invention, a plurality of still image data can be recorded on a recording medium, and each still image can be automatically reproduced while the order of the still images is specified and displayed at an arbitrary time. Further, the processing can be performed as reproduction synchronized with normal PTS without complicating the processing of the MPEG decoder used for decoding.
[0017]
In this embodiment, an optical disk is used as an example of a recording medium. However, the present invention is not limited to this, and there is no particular limitation as long as the recording medium is advantageous for random access. Also, the PlayList has been described as an example, but there may be more than one, and it is also possible for the user to select the PlayList by a method such as selecting from the operation unit.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing data reading of a PlayItem and a flow of time for automatically and continuously reproducing a still image at a predetermined time according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a reproduction method using a playlist for automatically and continuously reproducing a designated still image according to an embodiment of the present invention.
FIG. 3 is a configuration diagram of PlyList when displaying a plurality of PlayItems (1) to (n).
FIG. 4 is a configuration diagram of a recording / reproducing system that realizes the present invention.
FIG. 5 is a layout diagram of data when data according to the present recording method is recorded on an optical disc.
[Explanation of symbols]
101 IN_time (1), 102 IN_time (2), 103 IN_time (3), 104 clip still picture stream file, 105 Still Picture (still picture data) A, 106 Still Picture (still picture data) B, 107 ... Still picture (still image data) C.

Claims (4)

A still image recording method for recording a still image on a recording medium,
A still image stream file in which a plurality of still images are continuously recorded, and a playlist file for designating a reproduction order of the still images, wherein a still image display start time and a display end time in the playlist file are set to desired values. In addition to setting the display time, each still image data of the still image stream file includes a display start time, and the display start time of the still image is recorded corresponding to the display time of the still image set above. A still image recording method characterized by the following. A recording medium on which a still image is recorded,
A still image stream file in which a plurality of still images are continuously recorded, and a playlist file for designating a reproduction order of the still images, wherein a still image display start time and a display end time in the playlist file are set to desired values. In addition to setting the display time, each still image data of the still image stream file includes a display start time, and the display start time of the still image is recorded corresponding to the display time of the still image set above. Recording medium characterized by the above-mentioned. A still image playback method for playing multiple still images,
In the still image reproducing method in which the plurality of still images are displayed in a predetermined order for a predetermined period, display order information indicating an order in which the plurality of still images are displayed and a display period for each still image are set. Display time information corresponding to a display order and a display period are included in each still image, and still image data is displayed in synchronization with the display time information. Playback method. 4. The display time information according to claim 3, wherein the display time information includes a cumulative time when a plurality of still images are displayed in a predetermined order for a predetermined period, and is adjusted to the cumulative time included in each still image data. A still image reproducing method, wherein each still image is displayed on the display.

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