JPS62295594A - Recording system for stereoscopic television signal - Google Patents

Abstract

PURPOSE:To obtain a picture with high quality by recording at least four fields of stereoscopic television signal corresponding to left/right pictures on a video disk track in the signal form taking 1/2 of the field period of the current television system as one field period on one track alternately on a time series basis and in the order of fields. CONSTITUTION:The left/right eye video signals picked up by 2 sets of television cameras are converted into a time-series stereoscopic television signal taking 1/120sec as one field period. The said signal is the field sequential conversion of signals corresponding to a left picture signal L for one frame and a right picture signal R in odd and even fields respectively. The signal for 4 fields is recorded on one track in a stereoscopic video disk. The stereoscopic picture for one frame consists of the four fields of 1st field L1 2nd field R1 3rd field L2 4th filed R2 and the stereoscopic picture by one frame is recorded on one track of the disk.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention switches left and right images for stereoscopic television at regular intervals and displays them on one display screen, and synchronizes them with this display cycle. Regarding the time-division 3D television system in which the optical shutters of the left and right eyes of glasses are alternately opened and closed for stereoscopic viewing, in particular, the 3D television signal is time-compressed in the form of a field sequential signal and recorded on a video disk. This is what I did.

[Prior Art] As a conventional video disc for stereoscopic television, there is a 3D-VHD disc shown in FIG.
Electronics (Osaka) presentation).

3D-VHD will be explained below. This method uses V
IID video disc has 4 fields (2
It is possible to record up to
Utilizing the presence of orsc in TR, record the stereoscopic television signal in the recording format shown in Figure 5 (8),
This is played back by connecting a 3D adapter to the V) ID Blurer and viewed while wearing LCD shutter glasses.

First, during shooting, images for the left eye and right eye are simultaneously shot using two cameras, and when recording this onto a disk, the left and right images are recorded alternately as shown in Figure 5 (8). do. Here, in the figure, the left image is designated as R, the right image is designated as R, the subscript indicates the field number, and the same subscript indicates that the image was photographed at Kusunoki time.

As is clear from the figure, images from the same time are always placed on adjacent tracks, and by changing the sensor kinks within the vertical blanking period, which is located at four locations in one lap, the left and right images are It is a pattern that can be selected. These operations are possible due to the VHD function' EXTR8D.
This is because there is a C'” to I, and there is an E at the position marked with °゛・■ in the diagram.
Kick information of the XTRA DISC is recorded.

Now, to play a stereoscopic image on the 3I)-1jH11 disk, give a kick command as shown in Figure 5 (B),
Images are reproduced in a field sequential manner as R1→L2→R3=L4.

That is, the first field (odd field) of the right image
and the second field (even field) of the left image constitute a stereoscopic image for one frame.

At this time, the second field (even field) component of the right image and the first field (odd field) component of the left image recorded on the disk are not used.

On the other hand, FIG. 5C shows how a monaural (two-dimensional) image is reproduced on a 3D-V ID disc. In this case, by the kick command as shown in the figure, →L
Since the images are reproduced in the order of 2→L3→L4, a normal 2:1 interless image can be reproduced.

[Problems to be Solved by the Invention] In the conventional 3D-VI+DID disk stereoscopic video playback, the fields are played in sequence from R7 to -R3 to L4.

Therefore, the second field component (R2) of the right image and the first field component (Ll) of the left image are not used at all even though they are recorded on the disk, so the vertical resolution of the reproduced stereoscopic image is There was a drawback that it decreased to 1/2.

In addition, the left and right images are selected and played every field (1760 seconds), and the LCD screen operates in synchronization with this cycle.
Because stereoscopic images are observed using computer glasses, images are received by the left and right eyes at 1/30 second intervals, which causes 30Hz flicker, which significantly degrades image quality. Problems arise.

Flicker disturbance is particularly noticeable in areas where there are high-brightness patterns in the television image or where there is a large parallax between the left and right images.

Furthermore, in the conventional 3D-V) 10 disc recording format, the left and right images are recorded simultaneously using two tracks, so the playback time for stereoscopic television images is longer than that of a conventional VHD video disc. 1/ compared to the playback time of
'It becomes 2. For the same reason, when playing monaural images on a 3D-VHD disc,
A problem arises in that the playback time is 172 of the conventional Vl (D).In other words, while a normal VIID video disc can be played for up to 1 hour on one side (2 hours on both sides), 3D -Vl-10 has a playback time of 30 minutes on one side.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a high-quality stereoscopic television image by improving the reduction in vertical resolution and flickering caused by the conventional 39-VIIDID disk.

Still another object is to provide a recording system for a video disc for stereoscopic television that allows the same playback time as current video discs to be obtained even during stereoscopic television playback and monaural image playback.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides a three-dimensional television signal corresponding to left and right images on one track of a video disc at 17120 seconds in NTSC and high-definition systems. The left and right images are recorded alternately in field order in time series, and one field of 4/2 is recorded on one track. Note that in the PAL and SECAM systems, the signal format is such that one field period is 1/2 of 17100 seconds.

When reproducing this, the deflection frequency of the image receiving and display device in the current television system is set horizontally.

Display each image approximately twice as large both vertically and vertically.

The displayed time-series left and right images are observed using optical switches that open and close the visual fields of the left and right eyes in synchronization with the field period of the displayed images.

That is, the present invention relates to a stereoscopic television signal recording method for recording a stereoscopic television signal on a video disk, in which a stereoscopic television signal corresponding to left and right images is recorded on a track of a video disk at a station of the field period of the current television system. i.e. 17120 seconds or l/10
It is a signal format in which 1/2 of 0 seconds is one field period, and is characterized in that fields are recorded alternately in time series, and at least one field of 4/2 is recorded on one track.

[Function] According to the present invention, a video disc for stereoscopic television has at least four field sequential signals on one track.
fields can be recorded.

In this time-series stereoscopic television signal, the left and right images consist of four fields: left odd field L1 → right odd field R, - left even field L2 → right even field R2, each forming a stereoscopic image for one frame. At least one frame of stereoscopic television images can be recorded on one track of a video disc.

In addition, in addition to the above order, the stereoscopic television camera that records on one track is in the order R, -Ll -Ft@L
It goes without saying that 2/4 fields may also be used.

[Example] The present invention will be described in detail below with reference to the drawings. Note that, for convenience, the explanation will be made using the NTSC system as an example.

FIG. 1 is an explanatory diagram of an embodiment according to the present invention. Figure 1 (8) shows the recording format of a stereoscopic video disc. First, one field consists of 1/2 of 1/120 seconds of video signals for the left eye and right eye taken by two television cameras. Converts to a time-series stereoscopic television signal with a period.

This time-series stereoscopic television signal is, for example, a signal corresponding to each odd field and even field of a left image signal and a right image signal R for one frame,
Each signal of L2 and R, , R2, for example, L1→R,
- It is converted into a field sequential signal of L2→R2. This time-series stereoscopic television signal is recorded on a disc using the CAV method, which is the same standard as conventional laser video discs and is set at a constant speed of 1800 revolutions per minute.

As a result, in the stereoscopic video disc of this embodiment, q fields are recorded on one track, as shown in FIG. 1 (8). As shown in the figure, this time-series stereoscopic television signal consists of four fields: first field L1 → second field R1 → third field L2 → fourth field R2.
One frame's worth of stereoscopic images is constructed, and one frame's worth of stereoscopic images is recorded on one track of the disk.

Next, FIG. 1(B) shows a case where a stereoscopic video disc is played back.

This stereoscopic video disc contains the above-mentioned time-series stereoscopic television signal of two frames worth of stereoscopic images.

→R1→L2→R2→L3→R3→L4→R4 are recorded continuously from the outer circumference to the inner circumference, so as shown by the thick line arrow in Figure 1 (B), a conventional video disc player The reproduction output is reproduced at 1800 revolutions per minute and displayed on an image display device that operates at a horizontal and vertical deflection frequency approximately twice that of the current television standard system.
Electronic shutter (e.g. liquid crystal) synchronized with a field period of 20 seconds.

PLZT, etc.) can be used to open and close the visual fields of the left and right eyes to view the image as a three-dimensional image. However, in this case, the required frequency bandwidth of the video system of the conventional video disc playback device and the video frequency bandwidth of the stereoscopic image display device need to be expanded approximately twice.

For example, a high-definition video disc player can be used without any problems regarding the frequency band.

Recent TV receivers that support new media can handle current television broadcasting and teletext broadcasts with a single television receiver.
It is designed to be compatible with various new video media such as captains and personal computers, and when inputting signals manually from analog RGB input of primary color signals or digital RGB input terminal, the video frequency bandwidth is secured up to approximately 10MHz. has been done. In addition, due to the need to be compatible with various video media, multi-scan type television receivers with horizontally and vertically expanded deflection frequencies have appeared, and are already on the market from several companies.

Therefore, by connecting the playback signal from the stereoscopic video disc according to the present invention to a recent multi-scan type television receiver, high-quality stereoscopic television images can be easily displayed.

Next, monaural (two-dimensional image) playback using a stereoscopic video disc will be explained.

In this case, as shown in FIG. 1(C), of the time-series stereoscopic television signals recorded on one track, only the left image signal or the right image signal R can be selectively reproduced. good. That is, it is sufficient to read out L1→L2→L3→L4 or R1→R2→R3→R4.

In this case, in order to selectively read out only the green signal or the R signal on the track, for example, a code command recorded within the vertical blanking period of each field on the track can be used to reproduce the stereoscopic video or the Noral (two-dimensional image) signal. ) The first
After the time-series stereoscopic television signal is continuously reproduced as it is, as in the stereoscopic video reproduction shown in FIG. 3(B), only either the L signal or the R signal is gated by the video gate circuit.

FIG. 2 is an explanatory diagram of a reproduced signal according to an embodiment of the present invention.

Figure 2 shows the waveform for one frame of the stereoscopic video playback signal (^
) is shown. In addition, in the case of a monaural (two-dimensional image) playback signal, as shown in FIG. /120 seconds, and if this is viewed on an image display device that operates at a field frequency of 120)tz, it will be a field frequency 60)1z, 2.1 interless signal, which is the same as the current television system, so there will be no flicker. does not occur at all, and no reduction in vertical resolution occurs.

Therefore, the stereoscopic video disc of this embodiment not only does not cause flickering or a decrease in vertical resolution in either stereoscopic video playback or monochrome playback, but also can be used with conventional video disc players and high-definition video disc players. Complete compatibility is maintained. Furthermore, in both stereoscopic and monaural playback, it is possible to ensure a playback time equivalent to that of conventional video discs and high-definition video discs.

FIG. 2(C) is a gate signal waveform diagram for monaural reproduction.

FIG. 2(D) is a block diagram showing the configuration of an embodiment of a video gate circuit when a monaural reproduction signal is obtained from a time-series stereoscopic video reproduction signal in a stereoscopic video reproduction mode.

FIG. 3 is an explanatory diagram of another embodiment according to the present invention.

Conventional V) (D video disc has a constant speed of 900 revolutions per minute (
The data is recorded on the disc using the CAV method with a constant angular velocity).

For example, a 'WD video disc based on the CAV system L1 of the NTSC or high-definition system has a 1/2 field period of 1/60 seconds.
However, in the case of this embodiment, 1/1/2 frame of the time-series stereoscopic television signal is recorded.
Since one field period of 8/2 is 1/120 seconds, if recording is performed at 900 revolutions per minute, which is the same as a conventional VHD disk, one field of 8/2 will be recorded on one track.

As shown in FIG. 3 (8), for example, on one track of a stereoscopic VHD disk, there are the following fields: first field L1→second field R1→third field L2→fourth field L? R
, 8/2 is recorded in one field.

In the case of stereoscopic video playback, continuous playback is performed as shown by the bold line arrow in Figure 3 (B), while in the case of monaural (two-dimensional image) playback, the result is as shown in Figure 3 (C). , , or R signal only (L is indicated by a thick arrow in the figure)
(indicates the case of only a signal).

Furthermore, in the case of two-dimensional image reproduction as shown in FIG. 1(C), for example, only the left image signal is reproduced, but the image can be viewed with a reduction in brightness of about 20 to 30%.

FIG. 4 is an explanatory diagram showing field interpolation for monaural (two-dimensional image) reproduction.

FIG. 4(A) is a block diagram showing the configuration of one embodiment of the field interpolation method, and FIG. 4(CB) is a waveform diagram of the reproduced output after field interpolation.

If the field interpolation method is used as in this embodiment, the signal waveform during monaural playback on a stereoscopic video disc as shown in FIG. . This prevents the image brightness from decreasing even during monaural playback.

[Effects of the Invention] As is clear from the above explanation, depending on the recording method of the stereoscopic television signal of the present invention, the reproduced image is different from that of the conventional three-dimensional television signal.
Compared to O-VHD discs, the linear resolution does not decrease and no flicker interference occurs, making it possible to realize high-quality stereoscopic television images.

Furthermore, unlike the conventional 3D-v)ID disk, the playback time does not reach 172, so the same playback time as the conventional video disk can be ensured under either stereoscopic playback or monochrome playback.

The conventional 3D-VIIDID disk is 60 II
Flicker interference in time-division 3D television systems using the Z-field switching system is a major problem that degrades image quality.In order to improve this flicker, large-capacity field memories, etc., have been used to to remember,
A method of repeatedly reading this at twice the speed has been considered, but if a video disc based on the 3D television signal recording method of the present invention is used, a large capacity field memory is not required at all, and flickering can be eliminated at an extremely low cost. −
This makes it possible to realize a high-quality 3D television system that is free from distortion.

Furthermore, in the case of the embodiment shown in FIG. 1, the left image signal and the right image signal are recorded on one track of the video disc so as to form one frame each, so that the left image signal and the right image signal are recorded so as to form one frame each. Images can be easily reproduced.

Furthermore, the recording method of the present invention is compatible with current video discs and high-definition Muse video discs, and can be easily put into practical use at a low cost.

As described above, the present invention provides great added value to conventional video discs and high-definition video discs, and greatly contributes to the spread of video discs as a whole and, by extension, to the spread of high-definition as a packaged medium.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment according to the present invention, FIG. 2 is an explanatory diagram of a reproduced signal of one embodiment according to the present invention, FIG. 3 is an explanatory diagram of another embodiment according to the present invention, and FIG. 4 is an explanatory diagram of another embodiment according to the present invention. FIG. 5 is an explanatory diagram showing field interpolation for monaural (two-dimensional image) reproduction. FIG. 5 is an explanatory diagram of a conventional stereoscopic video disc.

Claims (1)

[Scope of Claims] In a recording method of a stereoscopic television signal in which a stereoscopic television signal is recorded on a video disc, a stereoscopic television signal corresponding to left and right images is recorded on a track of the video disc according to the field period of the current television system. 1. A stereoscopic television signal recording system characterized in that at least four fields are recorded on one track in a signal format in which one field period is 1/2 of the field period, and the fields are alternately recorded in time series.