JPH09327041A - Recording medium and stereoscopic image display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain compatibility with an normal image digital video disk and to improve a compression rate by storing a main video signal and also recording auxiliary data in an optional usage area for stereoscopic image reproduction. SOLUTION: An MPEG signal is extracted from a signal reproduced from the disk 26 by an extraction separating part 18. A bit stream (MPEG) signal is inputted to an MPEG decoder 20 and decoded. A video signal and an audio signal decoded by the MPEG decoder 20 are outputted to a display device 22. In the MPEG signal, it is permitted that an area (optional usage area) which is freely stipulated and used by a user is provided. Data for reproducing a stereoscopic image is recorded in the optional usage area. Then, the video signal and the audio signal are inputted to an MPEG encoder and compression- encoded by the standard of MPEG. Stereoscopic auxiliary data which forms the stereoscopic image together with the video signal is inputted from a stereoscopic auxiliary data part to the MPEG encoder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image technology, and more particularly to a recording medium.

[0002]

2. Description of the Related Art Various techniques have been proposed for stereoscopic video technology. First, regarding the display, the right eye and the left eye use polarized glasses, liquid crystal shutter glasses, and a lenticular plate is provided in front of the display screen so that the right eye image and the left eye image are viewed respectively. Etc. are considered.

Further, for stereoscopic display, usually, two video signals of a right eye image and a left eye image are required. This amount of signal data becomes a problem when at least two video signals are broadcast or recorded on a recording medium. Therefore,
As is well known, various compression techniques are used to reduce the signal amount. Regarding such compression encoding and decoding for broadcasting or recording, for example, Japanese Patent Publication No. 55-36240 (H04N9 / 54).
As shown in, various proposals have been made.

[0004]

The present invention specifically provides a digital video disc for stereoscopic images, which is compatible with the digital video disc for normal images. Further, the present invention provides a digital video disc for stereoscopic images, which has a high compression rate (it can be recorded for a long time).

The present invention also provides a stereoscopic display that is easy on the eyes. The present invention also provides a disc on which a stereoscopic image is preferably recorded.

[0006]

The present invention is characterized in that, in a recording medium on which a stereoscopic video is recorded, a main video signal is stored and auxiliary data is recorded in a use arbitrary area for reproducing the stereoscopic video. . The present invention is characterized in that the recording medium is a digital video disc.

The present invention is characterized in that a main video signal is stored in a main video stream, and auxiliary data for reproducing a stereoscopic video is recorded in an arbitrary area such as a private bit stream or a user area. The present invention
The main video signal is stored in the main video stream, and auxiliary data is recorded in an arbitrary area such as a private bit stream or a user area for stereoscopic video reproduction.
Furthermore, it is characterized in that stereo identification data indicating the presence of this auxiliary data is recorded.

The present invention is characterized in that the auxiliary data is depth information data or sub-eye image signal data. The present invention is characterized in that, in a recording medium for storing video signals from a plurality of angles, identification data for identifying a video signal forming a stereoscopic video signal among the plurality of video signals is recorded.

According to the present invention, in a recording medium for storing a main video signal and recording a sub-picture multiplexed and displayed on the main video signal, sub-picture creation data for reproducing a stereoscopic video is used as the sub-picture. It is characterized by being recorded. The present invention stores a main video signal and also records sub-picture creation data for reproducing a stereoscopic video as a sub-picture in a recording medium that records a sub-picture that is multiplexed and displayed on the main video signal. ,
It is characterized in that the stereoscopic identification data indicating the existence of the sub-picture creating data is also recorded.

The present invention is characterized in that, in a stereoscopic video reproducing method in which the reproduction qualities of the right-eye video signal and the left-eye video signal are different, the level of the reproduction quality is alternately changed. The present invention, in order to alternately convert the level of the reproduction quality of the video signal for the right eye and the video signal for the left eye alternately, by setting the compression rate in advance such that the level of the reproduction quality is alternately converted, The video signal for the left eye and the video signal for the left eye are recorded.

According to the present invention, in a recording medium having a plurality of recording layers, a video signal for forming a stereoscopic image is recorded in each layer.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. This first embodiment provides a stereoscopic disc compatible with a disc for normal images. A disk for normal images will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram for explaining the outline of the creation of data recorded on the master disc. The video signal and the audio signal are input to the MPEG encoder (10) and MP
It is compression coded according to the EG standard. A bitstream signal (hereinafter referred to as an MPEG signal) output from the MPEG encoder (10) is edited by a DVD editing unit (12) so as to conform to a disc standard, and then is stored in a master disc making bitstream memory (14). Will be recorded.

FIG. 2 is a diagram for explaining an outline of reproduction of a disc created by this master disc. Disc (16)
The signal reproduced by the extraction / separation unit (18) outputs M
The PEG signal is extracted. The MPEG signal is input to the MPEG decoder (20) and decoded.

The video and audio signals decoded by the MPEG decoder (20) are output to the display device (22).
The first embodiment provides a disc for stereoscopic images which is compatible with the disc (16) on which normal images are recorded. In the MPEG signal, it is permitted that the user freely defines and provides a usable area (use arbitrary area).

That is, as shown in FIG. 3A, a simple MPE
The bit stream of the G signal is a set of video signal packets and audio signal packets. However, as shown in FIG. 3B, an arbitrary area called “user area” may be provided in the data packet of the video signal, and unique data may be arranged in this area. Similarly, an arbitrary area called a "private stream" may be provided in parallel with the video / audio packet, and unique data may be arranged here.

The first embodiment is characterized in that data for reproducing a stereoscopic image is recorded in such a use arbitrary area. A disk for stereoscopic images will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram for explaining an outline of data creation to be recorded on the master disc of the stereoscopic disc.

The video signal and the audio signal are input to the MPEG encoder (10) and compression-coded according to the MPEG standard. The stereoscopic auxiliary data forming a stereoscopic image together with this video signal is M from the stereoscopic auxiliary data section (24).
It is input to the PEG encoder (10). The stereoscopic auxiliary data is, for example, an MPEG encoder (10).
If the image input to is a right-eye image signal, the stereoscopic auxiliary data is an MPEG signal in which the left-eye auxiliary data is compression-encoded by MPEG.

The stereoscopic auxiliary data may be, for example, depth information data corresponding to a video input to the MPEG encoder (10). The bit stream signal (MPEG signal) output from the MPEG encoder (10) is D so as to conform to the disk standard.
It is edited by the VD editing unit (12) and recorded in the master-producing bitstream memory (14).

FIG. 1 shows a disk made from this master.
The main video is reproduced even when reproduced by the conventional reproducing apparatus of.
FIG. 5 is a diagram for explaining an outline of reproduction of a disc (26) created by this master disc. The signal reproduced from the disc (26) is sent to the MPE by the extraction / separation unit (18).
The G signal is extracted.

The MPEG signal is sent to the MPEG decoder (2
0) and is decrypted. Further, the MPEG decoder (20) extracts and outputs the stereoscopic auxiliary data recorded in the use arbitrary area. The video signal, audio signal, and stereoscopic auxiliary data decoded by the MPEG decoder (20) are output to the stereoscopic display device (28).

In the reproducing apparatus shown in FIG. 5, a normal video disc (1
If 6) is reproduced, the stereoscopic auxiliary data is not output. Further, the stereoscopic display device (28) detects the input / non-input of the stereoscopic auxiliary data, and when it is not input, operates as a normal video display device. An example of the stereoscopic auxiliary data and the stereoscopic display device will be described with reference to FIG.

FIG. 6 shows an example in which depth information data is used as stereoscopic auxiliary data. The stereoscopic display device (28a) is
The main video signal (eg, from the MPEG decoder (20)
If a sub-picture signal (for example, a left-eye picture signal) is created from the right-eye picture signal) and the depth information data, stereoscopic display is performed. Another one of this stereoscopic auxiliary data and stereoscopic display device
An example will be described with reference to FIG. 7.

FIG. 7 shows M for the left eye as stereoscopic auxiliary data.
This is an example of using a PEG signal. Stereoscopic display device (28c)
Outputs the main video signal (for example, the video signal for the right eye) from the MPEG decoder (20) to the display unit for the right eye (30R). Further, the MPEG signal for the left eye is input to the MPEG decoder (32), and the decoded video signal (for example, the video signal for the left eye) is output to the display unit for the left eye (30L).

The voice signal is input to the voice unit (34). It should be noted that when the input of the MPEG signal for the left eye is detected and no input is made, the main video signal (video signal for the right eye) is displayed on both the right eye display unit (30R) and the left eye display unit (30L). Output. Next, a stereoscopic image disk using angle cell recording will be described with reference to FIGS.

First, a conventional angle cell will be described. Angle designation is one of the interactive functions of digital video discs. That is, as conceptually shown in FIG. 13, it is a function that can specify the video images created at different angles in the same scene at the time of reproduction.

FIG. 8 is a diagram for explaining the outline of data creation to be recorded on the master disc. The description of the audio has been omitted to simplify the description. The main video signal is MPEG
The data is input to the encoder (10) and compression-coded according to the MPEG standard. Video signals from different angles are also converted into MPEG signals by the MPEG encoders (36) and (38).

This MPEG encoder (10) (36)
Each bitstream from (38) (MPEG
Signal) is shown in FIG. Three bitstream signals output from this MPEG encoding (hereinafter MPE
The G signal) is DV so that it conforms to the disk standard.
It is edited by the D editing unit (12) and recorded in the master disc creating bit stream memory (14).

Editing in the DVD editing section (12) will be briefly described. As shown in FIG. 9B, a unit (hereinafter, referred to as a unit) in which audio blocks and video blocks of each bitstream are collected.
Call it a cell). Then, the bitstreams are combined on a cell-by-cell basis to create and output a bitstream as shown in FIG. 9C. FIG. 10 is a diagram for explaining an outline of reproduction of a disc created by this master disc.

The signal reproduced from the disc (40) is
The MPEG signal is extracted by the extraction / separation unit (44). In the scene where the video signals from a plurality of angle positions are recorded, only the MPEG signal corresponding to the video of the angle which is designated by the angle designation unit (42) in advance is output from the separation extraction unit (44). .

This MPEG signal is input to the MPEG decoder (20) and decoded. The video signal and the audio signal decoded by the MPEG decoder (20) are output to the display device (22). In the second embodiment, a disc for recording angle cells (16) and a disc for stereoscopic images compatible with the disc (16) are provided.

That is, the video signal for the remaining eyes for stereoscopic display may be recorded in one of the angles. FIG.
FIG. 1 is a diagram for explaining the outline of data creation. The difference from FIG. 8 is that the video signal input to the MPEG decoder (36) is a left-eye video signal for reproducing a stereoscopic video. That is, in terms of angles, the shooting positions are images from different angles by the distance between both eyes.

Further, the DVD editing section (12a) naturally adds identification data indicating that the angle is for stereoscopic reproduction. FIG. 12 is a diagram for explaining an outline of reproduction of a disc created by this master disc. The signal reproduced from the disc (40) is separated and extracted by the separation unit (48).
Thus, the MPEG signal is extracted.

In a scene where video signals from a plurality of angle positions are recorded, the angle / stereoscopic designating unit (5
MPEG corresponding to the video of the angle specified in 0)
Only the signal is output from the separation / extraction unit (48) to the MPEG decoder (20). This MPEG signal is MPE
It is decoded by the G decoder (20) and output to the stereoscopic display device.

In addition, the angle / stereoscopic designating unit (50) is prepared in advance.
In the case where a video signal for stereoscopically reproducing a video of an angle designated in advance is recorded and stereoscopic display is selected and designated in advance by the angle / stereoscopic designating unit (50), the separation extracting unit (48) The angle is detected by the above-mentioned identification information, and the MPEG signal corresponding to this angle is output to the stereoscopic display device (28c).

As described above, in the above embodiment, since the sub-picture signal for stereoscopic display (for example, the picture signal for the left eye) is recorded in the recording area of the picture signal from different angles, it can be recorded as a normal disc. So compatibility can be maintained.
In the above embodiment, the sub video signal for stereoscopic display (for example, the video signal for the left eye) is recorded in the recording area of the video signal from a different angle. It may be recorded in the area. A sub picture is a video such as a subtitle that is multiplexed on the main video signal. Due to its quality, the image quality at the time of reproduction is lower than that of the main video, but when displaying a stereoscopic image, it is difficult for humans to perceive even if the image quality of one is poor, and deterioration of the image quality is not a concern.

In the example of FIG. 7, the stereoscopic display device (28
In c), the main video signal is the right-eye video signal, and the remaining left-eye video signal is created from the main video signal and the depth information data. However, the quality of the created left-eye video signal is inferior to that of the right-eye video signal. This difference is
It is a level that the viewer cannot perceive. However, there are differences in quality.

Therefore, the main video signal may be switched to the left-eye video signal instead of the right-eye video signal from time to time. When the stereoscopic display device (28c) uses the main video signal as the left-eye video signal, the right-eye video signal is created from the main video signal and the depth information data. This switching is
It may be performed at regular intervals, or may be performed by automatically detecting a scene change.

In the case of FIG. 7, the compression ratios of the left and right video signals may be alternately changed beforehand. In general, the smaller the compression ratio, the better the image quality during reproduction. Still another embodiment will be described. Here, recording / reproduction of a stereoscopic video signal suitable for a DVD will be described. Recording / reproduction of a signal compressed by the MPEG technique on a DVD will be described with reference to FIGS.

It should be noted that in FIGS. 14 to 17, since reference numerals are newly added, some reference numerals may be the same as those in FIGS.
Another. First, recording on a DVD will be described. The DVD in this embodiment includes a single-layer type disc and a double-layer type disc. These two disks have rated values and reproduction conditions as shown in FIG. The two-layer type disc has a structure in which discs having a substrate thickness of 0.6 mm (tolerance ± 0.05 mm, the same applies hereinafter) are bonded to each other with the recording surface facing inward, and from one side to the first layer and the second layer. To enable recording and reproduction, the reflectance of the first layer is 20 to 40%,
The layer is 70% or more.

Further, the total thickness is 1.2 mm (permissible error ± 0.1 m), which is the same as the conventional CD which is a read-only disc.
m, the same hereinafter). Recording on a single-layer disc will be described with reference to FIG. The optical pickup 10 used for signal recording operates as follows. A laser beam having a wavelength of 650 nm (tolerance ± 15 nm, the same applies hereinafter) emitted from the semiconductor laser 9 enters the collimator lens 7 through the diffraction grating 8, is collimated by the collimator lens 7, and is halved by the half mirror 4. Is reflected, passes through the quarter-wave plate 20, and enters the objective lens 2.

The laser beam incident on the objective lens 2 is condensed by the objective lens 2, passes through the substrate 1 of the single-layer disc, and is irradiated onto the recording surface 3. The numerical aperture of the objective lens 2 is 0.6 (allowable error: ± 0.05, the same applies hereinafter) that allows a disk having a substrate thickness of 0.6 mm to focus light. The spot diameter of the laser beam with which the recording surface 3 is irradiated is shown in FIG.
Is 0.9 μm (0.85 to 0.95 μm).

Stereoscopic images for the right eye and the left eye are DV in the signal format described above using the optical pickup 10.
Recorded in D. Recording on a dual-layer disc will be described with reference to FIG. When recording a stereoscopic image on a two-layer disc, for example, data for the right eye is recorded on the first layer,
The data for the left eye is recorded on the second layer.

Therefore, in this case, the optical pickup 50 for the first layer and the optical pickup 40 for the second layer exist. The optical pickups 40 and 50 are located at the same radial position so that the data for the right eye and the data for the left eye can be recorded simultaneously. The operation of each of the optical pickups 40 and 50 is the same as that described with reference to FIG.

In a two-layer disc, the first layer and the second layer
Since the distances of the layers from the substrate surface are almost the same, the numerical apertures of the objective lenses 2a and 2b in the optical pickups 40 and 50 are both 0.6. Therefore, the wavelength 65 emitted from the semiconductor laser 9b in the optical pickup 50 is
A laser beam having a wavelength of 650 nm emitted from the semiconductor laser 9a in the optical pickup 40 is applied to the recording surface 3b of the first layer, and a laser beam of 0 nm is applied to the recording surface 3a of the second layer.

Also in this case, the spot diameters of both laser beams are 0.9 μm (0.85 to 0.95 μm) as shown in FIG.
m). In the above description, the data for the right eye is recorded in the first layer and the data for the left eye is recorded in the second layer. However, the present invention is not limited to this, and the data for the left eye is recorded in the first layer and the data for the right eye is recorded. Data may be recorded on the second layer.

When recording a stereoscopic image on a two-layer disc, the right-eye data and the left-eye data are independently compressed by MPEG technology and supplied to the right-eye optical pickup and the left-eye optical pickup, respectively. To be done. Next, reproduction from a DVD will be described. The reproduction from the single-layer disc is shown in FIG.
A laser beam having a wavelength of 650 nm (permissible error of ± 15 nm, the same applies hereinafter) emitted from the semiconductor laser 9 therein has a diffraction grating 8, a collimator lens 7, a half mirror 4, and a quarter.
The laser beam incident on the objective lens 2 through the wave plate 20 and condensed by the objective lens 2 is the substrate 1 of the single-layer disc.
The recording surface 3 is irradiated with the light. The laser beam reflected by the recording surface 3 returns to the half mirror 4 via the objective lens 2 and the quarter wavelength plate 20, is reflected by the half mirror 4, and is collected by the photodetector 6 via the condenser lens 5. It is illuminated and reproduced as a reproduction signal.

The reproduction signal detected by the photodetector 6 is sent to the decoder for the single-layer disc and reproduced as a stereoscopic image. When reproducing from a dual-layer disc, FIG.
The optical pickups 40 and 50 in 1) can operate at the same time, and can simultaneously reproduce the data recorded in the first layer and the second layer, that is, the data for the right eye and the data for the left eye.

Optical pickups 40 and 50 during reproduction
The operation of is similar to the operation of the optical pickup 10 shown in FIG. Photodetector 6 in optical pickup 50
The reproduction signal for the right eye detected by b and the reproduction signal for the left eye detected by the photodetector 6a in the optical pickup 40 are sent to the decoders for the right eye and the left eye, respectively, and reproduced as a stereoscopic image. It

FIG. 17 shows an example of the multi-layer structure proposed for DVD. In this way, compatibility can be obtained by writing the same signal as usual in one of the multiple layers. Then, auxiliary data for reproducing the stereoscopic image may be written in the other layer.

[0051]

As described above, according to the present invention, it is possible to provide a stereoscopic image disc and a device which are easily compatible with a normal image device and a disk. In addition, stereoscopic display that is easy on the eyes can be performed. The two-layer structure of the disk can be used to store a stereoscopic image.

Further, since a stereoscopic image is recorded by utilizing sub-pictures, it is possible to provide a disc which is compatible and has a small amount of data.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the first embodiment.

FIG. 3 is a diagram for explaining the first embodiment.

FIG. 4 is a diagram for explaining the first embodiment.

FIG. 5 is a diagram for explaining the first embodiment.

FIG. 6 is a diagram for explaining the first embodiment.

FIG. 7 is a diagram for explaining the first embodiment.

FIG. 8 is a diagram for explaining the second embodiment of the present invention.

FIG. 9 is a diagram for explaining the second embodiment.

FIG. 10 is a diagram for explaining the second embodiment.

FIG. 11 is a diagram for explaining the second embodiment.

FIG. 12 is a diagram for explaining the second embodiment.

FIG. 13 is a diagram for explaining the second embodiment.

FIG. 14 is a diagram for explaining the third embodiment of the present invention.

FIG. 15 is a diagram for explaining the third embodiment.

FIG. 16 is a diagram for explaining the third embodiment.

FIG. 17 is a diagram for explaining the structure of the disk.

[Explanation of symbols]

 (26, 46, 1) Disk (recording medium).

Claims (12)

[Claims] 1. A recording medium in which a stereoscopic image is recorded,
A recording medium characterized by storing main video signals and recording auxiliary data for reproducing stereoscopic video in an arbitrary area for use. 2. The recording medium according to claim 1, wherein the recording medium is a digital video disc. 3. A recording medium characterized in that a main video signal is stored in a main video stream, and auxiliary data is recorded in an arbitrary area such as a private bit stream or a user area for stereoscopic video reproduction. 4. A main video signal is stored in a main video stream, auxiliary data is recorded in an arbitrary area such as a private bit stream and a user area for reproducing a stereoscopic video, and a stereoscopic image showing the existence of the auxiliary data is recorded. A recording medium having identification data recorded therein. 5. The auxiliary data is depth information data,
Alternatively, the recording medium according to any one of claims 1 to 4, which is sub-eye image signal data. 6. A recording medium for storing video signals from a plurality of angles, wherein identification data for identifying a video signal forming a stereoscopic video signal among the plurality of video signals is recorded. . 7. A recording medium for storing a main video signal and recording a sub-picture that is multiplexed and displayed on the main video signal, wherein sub-picture creation data for stereoscopic video reproduction is recorded as the sub-picture. A recording medium characterized by the above. 8. A recording medium for storing a main video signal and recording a sub-picture that is multiplexed and displayed on the main video signal, wherein sub-picture creation data for reproducing a stereoscopic video is recorded as the sub-picture. A recording medium characterized in that stereo identification data indicating the existence of the sub-picture creating data is also recorded. 9. A stereoscopic image reproducing method in which the reproduction quality levels of the right-eye image signal and the left-eye image signal are different from each other, and the reproduction quality level is alternately changed. 10. A compression rate is set in advance so that the level of reproduction quality is alternately changed in order to alternately convert the level of reproduction quality of the right-eye video signal and the level of reproduction quality of the left-eye video signal. A recording medium that records the video signal for the eye and the video signal for the left eye. 11. A recording medium having a plurality of recording layers, wherein a video signal for forming a stereoscopic image is recorded in each layer. 12. The recording medium is a digital video disk, and the recording medium is any one of claims 3 to 8, 10, and 11.
The recording medium according to any one of 1.