JPH0440770A - Optical disk and optical disk reproducing device - Google Patents

Abstract

PURPOSE:To simultaneously allow the moving pictures of plural tracks to be displayed by recording main picture data and sub-picture data obtained by compressing the main picture data of the other tracks continuously on a specified track and recording the sub-picture data of the specified track as the main picture data and the main picture data as the sub-picture data on the other tracks respectively and continuously. CONSTITUTION:The detection of a signal recorded on an optical disk 2 is executed by a light pickup 3. Picture data reproduced according to the command of a controller 5 are received by the controller 5 and a jumping control circuit 8 makes the light pickup 8 jump to a specified track assigned by the controller 5 among three parallel tracks 9, 10 and 11 and gives tracking control by according to the result. The controller 5 selects the one of the three parallel tracks 9, 10 and 11 and display-reproduces the picture data of the selected track on a monitor 7. Consequently, the screen of 3-channel moving picture window- displayed can be displayed while selecting enlargement or reduction freely.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in the fields of education and training, and is used in high-definition televisions with multimedia systems, and includes an optical disc and an optical disc capable of selectively reproducing image data. The present invention relates to an optical disc playback device.

In recent years, multimedia image display systems equipped with optical disk playback devices have been used as conventional system equipment for technical education and training to selectively play back and enlarge high-quality image data. It's here. A conventional optical disk reproducing device and an optical disk as a recording/reproducing medium that constitute this multimedia image display system will be explained.

FIG. 5 is a block diagram of an optical disc playback device forming one block of a conventional multimedia image display system. An optical disk 2 is rotated by a spindle motor 1, and image data recorded on the optical disk 2 is read by an optical pickup 3. This image data is input to a subsequent video processor 4, and the output of said video processor 5 is input to a controller 5 for processing.

The controller 5 interactively switches between the three channels of image data using program software or the operator's operation of the mouse 6, and reproduces the image on the monitor 7 while making a selection.

FIG. 6 shows a screen display of the high-definition monitor 7.

For example, an HDTV standard aspect ratio of 16:9 is used. The three channels of image data Vl, V2, and v3 are displayed in a window on the monitor 7. For normal use, the image of the channel you want to see in the highest quality is enlarged and displayed as shown in ■1, and the images of other channels (V2 and V3) are only needed to check the program progress, so they are displayed in a reduced size and played back. do. For example, in an image program for learning a golf swing form, forms photographed from the front side of the player in vl, from the right side of the player in v2, and from the left side of the player in v3 are displayed in parallel progress. The operator operates the mouse 6 to select a channel (for example, Vl) that the operator wants to concentrate on and observe in high quality, and interactively switches and displays the channel in an enlarged manner.

FIG. 4 shows a track format in which three channels of image data are divided into sectors and recorded.

Ta represents the time interval for one frame (]/30f), and image data for three channels is stored in this time interval for one frame. In order to display images for three channels simultaneously in a window, as shown in Figure 4,
Image data for three channels must be time-division multiplexed at the time interval Ta of one frame. To achieve this, it is necessary to encode and record image data with high efficiency, and to compress it in time.

On the other hand, enlarged high-quality videos such as Vl, BTA
The number of pixels is approximately 1/6 the effective number of pixels in the high-definition standard of the Japan Broadcasting Technology Development Council (Broadcast Technology Development Council), and image data is encoded with high efficiency. If the compression rate of high-efficiency encoding, which maintains high image quality to some extent, is about 1/4, the recording data rate will be about 40 Mbps per channel.

Furthermore, as shown in Fig. 4, the time interval Ta of one frame is
When image data for channels are time-division multiplexed, the recording data rate reaches 120 Mbps.

However, with the above configuration, such a high recording data rate requires a high speed rotation of 10,000 rpm or more, even considering a read-only optical disc such as a CD-ROM. , there was a problem that it was impossible to implement as a system equipment for education and training.

In addition, in order to achieve a high data rate, the number of rotations of the optical disc 2 is set within a feasible range, and three optical pickups 3 are installed to simultaneously play back three channels of image data in parallel and display it in a window on the monitor. A configuration may also be considered. However, with this configuration, the optical pickup 3
or three are required, and the optical system of the optical disc playback device,
Since the control of the optical pickup 3 is complicated, it is difficult to implement it as a system device for education and training.

As described above, it has been difficult to realize an optical disc playback device that time-division multiplexes multiple channels of image data, records it on an optical disc, and plays back the content while interactively selecting it.

The present invention records videos of multiple channels on an optical disk by time-division multiplexing, displays videos of multiple channels simultaneously in a window on a monitor, and replays them while interactively selecting high-quality enlarged display or reduced display. An object of the present invention is to provide an optical disc and an optical disc playback device that can be easily implemented.

Means for Solving the Problems An optical disc according to claim 1 records image data of a main image channel divided into a plurality of sectors on each of at least two or more parallel tracks of a disc-shaped recording medium, and records the image data of a main image channel divided into a plurality of sectors. The image data of the main image channel obtained by compressing the image data of the main image channel recorded on other parallel tracks is divided into one or more sectors, and the image data of the main image channel is recorded. Claim 2 characterized in that the data is continuously recorded in the sector string that has been recorded.
The optical disc reproducing apparatus according to claim 1 is characterized in that at least one track is selected and reproduced from among the parallel tracks on the optical disc having the format according to claim 1.

According to the structure described in each claim, main image data and sub-image data obtained by compressing main images of other tracks are continuously recorded on a certain track of an optical disc, and the above-mentioned image data is continuously recorded on other tracks. By sequentially recording the sub-image data of a specific track and track as main image data, and the main image data of the specific track as sub-image data, an optical disc playback device can simultaneously display multiple tracks of moving images in a window on a monitor. I can do it. This allows you to zoom in on high-quality image data, reduce other image data, and interactively select it. can also be displayed at the same time.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the structure of a track format of an optical disc in an embodiment of the present invention. It shows the track format of three parallel tracks 9.10.11, and Tb is the time interval of one frame (1/3
0 seconds), which is the same value as Ta in FIG.

vl represents a sector of image data for the first channel, v2 for the second channel, and 3 for the third channel. In track 9, the main image channel is the first channel (Vl), and the second channel (V2) and the third channel (V3) are sub-image channels. The main image channel is displayed in an enlarged manner with high image quality on the monitor 7, and the sub-image channel compresses the image data of the main image channels of other tracks and is displayed in a reduced size. Also, for track 10, the main image channel is the second channel (■2), and the first
Channel (Vl) This is the third channel (V3) or sub-image channel. Further, in track II, the main image channel is the third channel (3), which is either the first channel (Vl), the second channel (V2), or the sub-image channel. Time interval for one frame (1/30 second) Tb
is divided into 10 sectors, and the main image channel is 8
The sub-image channel stores image data for one sector each. For example, on track 9, the first channel (Vl) has 8 sectors, the second channel (V2),
Image data for each third channel (V3) is stored in one sector.

The main image channel is a high-quality video that is enlarged and displayed by BT.
The number of pixels is approximately 1/6 the effective number of pixels in the high-definition standard of A (Broadcast Technology Development Council), and image data is encoded with high efficiency.

The compression rate of high-efficiency encoding that maintains high image quality to some extent is 1.
/4, the recording data rate becomes approximately 40 Mbps per channel. The main image channel is
Since data is stored in 8 sectors out of 10 sectors in a time interval (1/30 second) of one frame, compression is performed by performing high-efficiency encoding by an additional 8/10 within the frame. However, even if this degree of intra-frame compression is performed, there is almost no deterioration in image quality, so the image quality of the main image channel can be sufficiently maintained.

On the other hand, the sub-image channel only needs to have a screen size and image quality that are sufficient for checking program progress, so the image data of the main image channel of other tracks is compressed and displayed in a reduced size on the monitor 7, and the image data of the main image channel of the other tracks is compressed and displayed on the monitor 7. Display in a window with a high-quality enlarged screen. The effective number of pixels of the sub-image channel is the screen size of the number of pixels reduced by about 1/4 of the effective number of pixels of the main image channel.

The secondary image channel is! Time interval for frames (1/3
Since the data is stored in 1 sector out of 10 sectors (0 seconds), it is necessary to further perform compression by performing high-efficiency encoding of about 1/2 within the frame. However, as described above, the sub-image channel only needs to have an image quality that is sufficient to confirm the progress of the program, so there is no practical problem even if intra-frame compression of about 1/2 is performed.

In this way, if the main image channel and the sub-image channel, which is the compressed image data of the main image channel, are time-division multiplexed and formatted at a time interval of one frame (1/30 second), the recording data rate will be , approximately 40 Mbp, which is the same as the recording data rate of the image data of the main image channel.
It becomes s. Therefore, by using an optical disk with a diameter of 30 cm, such a recording data rate can be sufficiently achieved at a rotation speed of 3600 rpm or less.

FIG. 2 shows an apparatus for reproducing image data recorded on an optical disc having the above format. Components having the same functions as those of the conventional optical disk reproducing device shown in FIG. 5 will be described with the same reference numerals.

An optical disk 2 is rotated by a spindle motor 1, and a recorded signal is detected by an optical pickup 3. This detection signal is converted into a digital signal by the subsequent video processor 4, and further processes such as demodulation and error correction are performed on this digital signal. Then, the controller 5 accepts the image data reproduced according to the command from the controller 5, and based on the result, the jumping control circuit 8 selects the controller 8 among the three parallel tracks 9, 10, 11.
The optical pickup 3 is caused to jump to a specific track designated by the driver, thereby controlling the trucking jig. The controller 5 is operated by the program software for education and training or by the operation of the mouse 6 by the operator of this optical disc playback device.
One of the three parallel tracks 9, 10, and 11 is selected, and the image data of the selected track is displayed and reproduced on the monitor 7.

In this way, if you select one of the three tracks running in parallel (9.10.II in Figure 1) and jump, and apply tracking control, the three channels displayed in the window You can freely choose to enlarge or reduce the video screen. Next, the state of this display operation will be explained with reference to FIG.

FIG. 3 is a diagram showing a screen display on the monitor 7 of the optical disc reproducing apparatus of the present invention. Figure 3 (a), (b), (C
) are respectively the three tracks 9.10.1 in FIG.
1 is a screen display reproduced when the reproduction light beam of the optical pickup 3 is jumped and tracking control is applied.

For example, when jumping to track 9 and applying tracking control, the first channel (Vl) is displayed in high resolution and enlarged, as shown in Figure 3(a), and the second channel (Vl) is
2), the third channel (■3) is displayed in a reduced size.

Next, while the program is in progress, the operator selects the second channel (v
2), operate the mouse 6, move the pointer 14 to a part of the screen of the second channel (V2) on the monitor 7, and click. Then, the controller 5 sends a jumping command to the track IO to the jumping control circuit 8, and the jumping control circuit 8 controls the optical pickup 3, jumps the track 10, and performs tracking control. In this way, the optical pickup 3 regenerates the trunk IO, and as shown in FIG. 3(b), the second channel (■2) is enlarged, the first channel (■1), and the third channel (■3 ) is displayed in a reduced size.

Similarly, if the operator wants to enlarge the third channel (v3), operate the mouse 6 and display the third channel on the monitor 7.
If you move the pointer 15 to a part of the channel (V3) screen and click, it will jump to track 11 and the third channel (v3) will be enlarged and displayed as shown in Figure 3 (C), and the first channel (Vl), second channel (
v2) is displayed in a reduced size.

In addition to the window display of the video, the monitor 7 also displays text data 16 such as characters, a video program search,
It is also possible to display operation buttons 17 for fast forwarding and still image playback. The data necessary for this can also be stored in sectors on the track format.

Also, if one of the three tracks is selected and the image data of one main image channel recorded on that track is displayed in high quality, the three tracks are displayed on the monitor 7.
Since more than one image may be displayed and two or more images may be used as main images, it is not necessary to limit the number of main image channels to one and the number of sub-image channels to two.

However, in this case, the optical pickup 3 needs to be a light beam for reading as many main image channels as are displayed on the monitor 7, so either multiple optical pickups 3 are provided, or one optical pickup is provided with a photoelectric reading unit having multiple beams. There is a need.

Effects of the Invention As described above, according to the optical disc according to claim 1, image data of a main image channel is divided into a plurality of sectors and recorded on each of at least two or more parallel tracks of a disc-shaped recording medium, In each track, the image data of the main image channel obtained by compressing the image data of the main image channel recorded on other parallel tracks is divided into one or more sectors, and the image data of the main image channel is divided into one or more sectors. Because it was recorded continuously in the sector column where it was recorded,
Multiple channels of video can be time-division multiplexed and recorded on a single track, allowing the image data of the main image channel to be enhanced without further increasing the rotational speed of the optical disk or increasing the number of channels of the optical beam of the recording head. Image quality and image data of sub-image channels of one or more parallel tracks can be recorded simultaneously.

Furthermore, since image data is recorded on the optical disc having the format of claim 1 and reproduced by the optical disc playback apparatus of claim 2, video data of multiple channels are recorded by time division multiplexing (few parallel tracks). By reading the image data of a specific track in the
Images of sub-image channels of more than one track can be played simultaneously. By simultaneously displaying multiple channels of video in a window on the monitor, you can interactively select high-quality enlarged or reduced display.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the track format of an optical disc in one embodiment of the present invention, FIG. 2 is a block diagram of an optical disc reproducing apparatus for reading image data recorded on the optical disc of the present invention, and FIG. 3 is a diagram showing the track format of an optical disc according to the embodiment. Diagram showing the display screen, No. 4
The figure shows the track format of a conventional optical disk, FIG. 5 is a block diagram of an optical disk playback device that reads image data recorded on an optical disk having a conventional track form, and FIG. 6 shows a display screen of a conventional example. FIG. 2... Optical disc, 3... Optical pickup, 7...
- Monitor, 8...Jumping control circuit, 9.10.
11...Track, Vl...1st channel, V2
...2nd channel, v3...3rd channel. Agent: Yoshihiro Morimoto / Figure 2, Figure 4, Figure 4

Claims (1)

[Claims] 1. Image data of a main image channel is divided into a plurality of sectors and recorded on each of at least two or more parallel tracks of a disk-shaped recording medium, and each track is recorded with other parallel tracks. An optical disc in which the image data of a sub-image channel obtained by compressing the image data of the main image channel recorded on the main image channel is divided into one or more sectors, and the image data of the main image channel is recorded continuously in the sector row in which the image data of the main image channel is recorded. . 2. An optical disc reproducing apparatus which selects and reproduces at least one track from among the parallel tracks of the optical disc according to claim 1.