JP3671557B2 - Optical disk device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc apparatus having a function for editing a video signal recorded on an optical disc.
[0002]
[Prior art]
First, a conventional optical disc apparatus of this type will be described with reference to FIGS.
FIG. 6 is a plan view of an optical disc for explaining a state in which video data and a time code are recorded. FIG. 7 is an explanatory view showing an arrangement of video data recorded on the optical disc. FIG. FIG. 9 is a flowchart for explaining an editing function of a technical optical disc apparatus, and FIG. 9 is a diagram for explaining an operation of an optical pickup during editing in the conventional optical disc apparatus.
[0003]
In recent years, optical disc recorders have been used for news gathering, etc. When recording video data etc. on an optical disc using the optical disc recorder, the time code of an arbitrary scene is recorded at the start and end of each cut. In recent years, only one frame of video indicated by these time codes at the time of editing is read as an index scene and displayed as a list on the screen of a video display device.
[0004]
FIG. 6 shows a state where the video data and the time code are recorded on the optical disc. The video data is recorded while forming a spiral track or an annular track from the outer peripheral portion to the inner peripheral portion of the video area Ev of the optical disc D, and the time code indicating the index scene is recorded on the optical disc D different from the video area. It is recorded in the index information area Et provided in the center.
[0005]
Thus, a large amount of video data is recorded on the optical disk D by the optical disk recorder. Thereafter, when editing the video data, the recorded optical disk D is edited by an optical disk device having an editing function. That is, the recorded optical disk D is set in the optical disk apparatus, and first, time code information indicating an index scene is read out by an optical pickup. Thereafter, the optical pickup is driven by a coarse seek to jump to a scene track corresponding to these time codes, and one frame of video data recorded there is read out as an index scene.
[0006]
At that time, in order to accurately display one frame of the target video, the optical disk must be accurately sought with an optical pickup. In this case, it takes a lot of time for one seek process to read out each index scene, and it takes too much time to read out all index scenes.
Means for causing the optical pickup to seek in order to accurately read out one frame of the target video is, for example, page 159 of “Optical Disc Technology” published by Radio Technology Co., Ltd., “1/3 Servo Control System, (4 ) Seek servo system "described below, and is carried out by the seek servo drive mechanism of" Block diagram of seek servo system "described on page 161, FIGS.
[0007]
The seek operation will be described with reference to FIGS. It is assumed that one frame of video data is recorded in the video area Ev of the optical disc D in a format for recording one track, and the video signal is in the NTSC format. FIG. 7 shows the video data recorded on the track in order of scene 1, scene 2... For each time code in the video area Ev of the optical disc D.
[0008]
In order to read the video data of the scene of the specified time code from the optical disc D, as described above, the optical pickup is jumped to the track corresponding to the time code, and one frame of video recorded there Read the data.
However, in order to accurately jump to a designated track, a procedure as shown in FIGS. 8 and 9 must be taken.
[0009]
As an example, assume that the optical pickup is currently reading the 100th track (track No. 100, the same applies hereinafter). Assume that after reading the 100th track, the 1000th track is read.
When the optical pickup jumps for 900 tracks, the coarse motor is operated while counting with a traverse counter (a device that counts how many tracks are jumped), and the first 100 tracks are jumped while accelerating, The next 700 tracks cause the optical pickup to jump at a constant speed. Then, the motor begins to decelerate after jumping for a total of 800 tracks, and once the track has advanced 100 tracks, the jump of the optical pickup is temporarily stopped (coarse seek, step ST1), and the address is read (ST2).
[0010]
However, if the optical pickup is caused to jump at a high speed, an error occurs in the count of the traverse counter, and the optical pickup may not be able to accurately jump to the target designated track, and may remain in the vicinity of the jump. In such a case, the tracking actuator is then operated to move the optical pickup to the designated target track, and several jumps or one track-by-track jumps are repeated (fine seek, ST3). .
[0011]
Then, when the optical pickup can accurately jump to the target designated track, track and cue one frame of the video data (ST4), the one frame is reproduced (ST1). Then, the reading of the video data of one designated one frame is completed.
[0012]
[Problems to be solved by the invention]
As described above, there is a problem in that it takes time to seek a target video frame accurately, and it takes too much time to read all target index scenes.
[0013]
An object of the present invention is to solve such a problem, and even if it is not frame video data pointed to by an accurate time code, if it is one frame in the vicinity of the designated time code, Since practically equivalent video data is recorded, instead of reading the video data one frame at a time and using it as an index video, paying attention to the fact that there is practically no problem, one frame of each scene is processed at high speed. An object is to obtain an optical disc apparatus having a function of reading and editing.
[0014]
[Means for Solving the Problems]
Therefore, the optical disk apparatus according to the present invention records an optical pickup on an optical disk from an optical disk on which a large number of video data and time codes attached to the respective video data are recorded. Drive means for driving with a coarse seek until slightly before the target video data recording track, and the coarse seek causes the optical pickup to reach an allowable range in the vicinity of the target video data recording track. If not, driving means for driving the optical pickup with medium coarse seek toward the target video data, and the recording track of the target video data by the optical pickup by the coarse seek or medium coarse seek The allowable range of the target video data when reaching the allowable range near And composed of a means for reading out one frame of the neighborhood as an index scene solves the above problems.
[0015]
Therefore, according to the present invention, since video data in the vicinity that is practically equivalent to the target video frame is read and one frame of the read video frame is used as an index scene, a large number of target video data indexes. The scene can be read out at high speed, and the editing work time can be shortened.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, the optical disk apparatus of the present invention will be described with reference to FIGS.
FIG. 1 is a flowchart for explaining the editing function of the optical disc apparatus of the present invention, and FIG. 2 is an operation of an optical pickup for explaining a method of reading an index scene at the start of shooting a certain scene by the optical disc apparatus of the present invention. FIG. 3 is an explanatory diagram, FIG. 3 is an operation explanatory diagram of an optical pickup for explaining a method of reading an index scene at the end of shooting of a certain scene by the optical disc apparatus of the present invention, and FIG. FIG. 5 is an operation explanatory diagram of an optical pickup for explaining a method of reading an index scene of an arbitrary scene of the scene to be read, and FIG. 5 is a specific example in the case of reading an index scene at the start of shooting a certain scene shown in FIG. FIG. 6 is an operation explanatory diagram of the optical pickup showing
[0017]
First, the operation of the optical pickup will be described with reference to FIGS. 1 and 2 when reading a target index scene in the optical disc apparatus of the present invention.
When the recording start index scene Is of a certain scene shown in FIG. 2 is read out, the time code information recorded in the index information area Et of the optical disc D on which the video data is recorded is placed below the scene. The recording start index scene Is is detected from the current position by detecting the start of recording and operating the coarse motor while coarsely seeking the optical pickup while counting the track with the traverse counter in the same manner as in the prior art. To a track between 1 second and 30 seconds later (ST1). Then, the address of the track is read (ST2).
[0018]
As described above, when an error occurs in the count of the traverse counter and the optical pickup does not jump into the track range between 1 second (30 frames) after the target recording start index scene Is, Thereafter, the coarse motion motor is further operated so as to fall within this range, and the optical pickup is subjected to a medium coarse seek (ST3).
Then, it is determined by reading the address of the track that it is within the target range, and if it is within the target range, the rotation of the optical disk D until the head of the video frame of the track comes out. (ST4), the video frame of the track is read out and used as an index scene (ST5).
[0019]
Specifically, one frame of ± 0.5 seconds (± 15 frames) centering on 0.5 seconds is read out from the recording start index scene Is at the start of shooting, and used as an index scene.
[0020]
Next, when the recording end index scene Ie of a certain scene is read, the time code information recorded in the index information area Et is detected below to detect that the recording of the scene is ended. The optical pickup is roughly sought in accordance with the flowchart shown in FIG. 1, and as shown in FIG. 3, any one frame from the current position to the target recording end index scene Ie is read as an index scene.
Specifically, one frame of ± 0.5 seconds (± 15 frames) centering about 0.5 seconds before the recording end index scene Ie at the end of shooting is read as an index scene.
[0021]
Next, when the time code information read from the index information area Et is an arbitrary index of a certain scene, as shown in FIG. 4, the target arbitrary index scene Ia is centered. One frame of ± 0.5 seconds (± 15 frames) is read out to be an index scene.
[0022]
As a specific example of reading an index scene by the optical disc apparatus of the present invention described above, a case of reading an index scene at the start of shooting a certain scene will be described.
As shown in FIG. 5, for example, when reading an index scene of a scene at the beginning of shooting of 1: 12: 40: 11 (11th frame of 1 hour 12 minutes 40 seconds), +15 frames after the time code is read out. The optical pickup is caused to jump aiming at a time code of 1: 12: 40: 26, and within ± 15 frames (here, since one frame is one track, the target track is within ± 15 tracks), that is, 1: If jumping between 12:40:11 (track No. 129611) to 1: 12: 41: 11 (track No. 129641), the image data of the jumped track is read and indexed. It can be a scene.
[0023]
【The invention's effect】
As described above, according to the optical disc device of the present invention, an index scene that is practically equivalent can be read, and the index scene of desired video data is displayed on the screen of the display device as compared with the optical disc device of the prior art. A number of excellent effects can be obtained, such as the editing work time for displaying a list can be reduced to about half.
[Brief description of the drawings]
FIG. 1 is a flowchart for explaining an editing function of an optical disc apparatus of the present invention.
FIG. 2 is an operation explanatory diagram of an optical pickup for explaining a method of reading an index scene at the start of shooting a scene by the optical disc apparatus of the present invention.
FIG. 3 is an operation explanatory diagram of an optical pickup for explaining a method of reading an index scene at the end of shooting a certain scene by the optical disc apparatus of the present invention.
FIG. 4 is an operation explanatory diagram of an optical pickup for explaining a method of reading an index scene of an arbitrary scene of a certain scene by the optical disc apparatus of the present invention.
FIG. 5 is an operation explanatory diagram of the optical pickup showing a specific example in the case of reading an index scene at the start of taking a certain scene shown in FIG. 2;
FIG. 6 is a plan view of an optical disc for explaining a state in which video data and a time code are recorded.
FIG. 7 is an explanatory diagram showing an arrangement of video data recorded on an optical disc.
FIG. 8 is a flowchart for explaining an editing function of a conventional optical disc apparatus.
FIG. 9 is a diagram for explaining the operation of the optical pickup during editing in the conventional optical disc apparatus.
[Explanation of symbols]
Is ... recording start index scene, Ie ... recording end index scene, Ia ... arbitrary index scene, D ... optical disc, Ev ... video area, Et ... index information area

Claims (1)

From an optical disk on which a large number of video data and time codes attached to the respective video data are recorded, an optical pickup is recorded on the optical disk based on the time code. Driving means for driving with a coarse seek in the vicinity of the recording track;
When the optical pickup does not reach an allowable range in the vicinity of the target video data recording track due to the rough seek, the optical pickup is further moved toward the target video data recording track. Driving means for driving by seek;
When the optical pickup reaches the allowable range in the vicinity of the recording track of the target video data by the rough seek or the intermediate rough seek, one frame in the vicinity of the target video data in the allowable range is indexed. An optical disk apparatus comprising: means for reading out as a scene.

Images