JPH0526398B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a device for transmitting a stereoscopic video signal using binocular parallax. Prior Art Conventionally, a method called an alternative method has been proposed to realize a three-dimensional image device.
The alternative method will be explained below. First, the left imaging device and the right imaging device photograph a subject and output a left video signal and a right video signal, respectively. The output left video signal and right video signal are sequentially switched at regular time intervals by a switching control circuit and sent out alternately.
The predetermined time intervals are performed in synchronization with vertical synchronization signals, for example. In addition, the superimposed signal generator generates a superimposed signal, such as ultrasonic waves, to identify the left and right sides of the video signal when the left video signal or right video signal is switched in synchronization with the switching of the left and right video signals. , the left and right video signals are superimposed and output by a signal superimposition device. Next, left and right video signals, left and right identification signals, audio signals, etc. are separated. By transmitting the separated superimposed signal to a shutter device installed between the viewer's eyes and a video display device realized by, for example, a cathode ray tube, the shutter of the shutter device receives the left video signal. It opens and closes in synchronization with the switching between the right video signal and the right video signal. Therefore, switching between the left and right sides of both sides of the video display device and switching between the left and right shutter devices based on the left and right identification signals are always performed in correct synchronization. Problems to be solved by the invention As described above, in the conventional alternative system, the left eye always sees the left image, and the right eye always sees the right image, so it is possible to obtain three-dimensional vision. The correspondence between switching between the left and right images on the screen and the shutter is always a simple repetition of alternating operations, and for example, it is not possible to open the right shutter and the left shutter at the same time. SUMMARY OF THE INVENTION An object of the present invention is to provide a three-dimensional video signal transmitting device in which switching between the left and right shutters of a shutter device can be controlled independently of switching between left and right images on a screen. Means for Solving the Problems The present invention provides a means 3 for generating a left video signal, a means 2 for generating a right video signal, a left video signal from the left video signal generating means 3, and a right video signal. A video signal changeover switch SW3 that alternately switches and outputs the right video signal from the video signal generation means 2 for each field, a pair of superimposition switches SW1 and SW2, and a mode changeover switch 18, comprising (a) Before the left video signal is derived from the video signal changeover switch SW3 for each field, one of the pair of superimposition switches SW1 and SW2 is switched on.
1 as ON/OFF switching state,
The other superimposition switch SW2 is set to the other switching state, and prior to the right video signal being derived, one of the superposition switches SW1 is set to the other switching state, and the other superposition switch SW2 is set to the one switching state. Alternative mode position 18a- and (b) a pair of superimposition switches SW before the left video signal is derived from the video signal changeover switch 3 for each field.
1. Turn one of the superposition switches SW1 out of SW2.
The other switching state is set to ON/OFF, the other superimposition switch SW2 is set to one switching state, and before the right video signal is derived, one of the superimposition switches SW1 is set to the one switching state, and the other superimposition switch Cross alternate mode position 18a- in which SW2 is set to the other switching state; and (c) the pair of superimposition switches SW1 and SW2 are set to the one switching state for each field from the video signal changeover switch 3. fully open mode position 18b, and (d)
Left-open mode position 18c where one superimposition switch SW1 is kept in one switching state and the other superposition switch SW2 is kept in the other switching state.
and (e) right-open mode position 1 in which one superimposition switch SW1 is kept in the other switching state and the other superposition switch SW2 is kept in one switching state.
8d, and a pair of superimposition switches SW for each field.
1, generating means 17 for generating 2-bit serial coded shutter control signals SL, SR in response to the output of SW2; and shutter control signals SL, SR from the generating means 17;
are the periods F1L, F2R, during which the left and right video signals of the video signal changeover switch SW3 are derived.
This apparatus is characterized in that it includes a superimposing means 15 for deriving a superimposed stereoscopic video signal during periods A1, A2, and A3 prior to F3L. According to the present invention, the 2-bit serial coded shutter control signals SL and SR are created based on the respective switching states of the pair of superposition switches SW1 and SW2, and
The switching state of SW2 is the parallel alternative mode position 1 by the mode changeover switch 18.
8a-, crossed alternative mode position 18
a-, the full open mode position 18b, the left open mode position 18c, and the right open mode position 18d are controlled corresponding to each field, and the left video signal and right video signal are controlled by the video signal changeover switch SW3. 1
Based on the shutter control signals SL and SR which are alternately switched and derived for each field and thus coded in 2-bit series, a signal is sent to the left eye and the right eye in front of the video signal device that displays the video signal. Open and close the corresponding left and right shutters,
In a manner corresponding to each position, it is possible to view a stereoscopic image, an image on either the left or right side, or even both left and right images. Embodiment FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The present example will be explained below with reference to FIG. The right imaging device 2 and the left imaging device 3 photograph the subject 1 and output a left video signal and a right video signal in synchronization with each other. These output signals are input to the signal superimposing device 4. The signal superimposing device 4 sequentially switches the left video signal and the right video signal every vertical synchronization period, that is, every field, and alternately outputs the left video signal → right video signal → left video signal, etc. is input. In this case, the vertical synchronization period is used as the switching period in this embodiment. Further, the signal superimposing device 4 superimposes a shutter control signal generated in accordance with the operating state of the superimposing switch 13 on the left and right video signal sequences (hereinafter referred to as "alternative signals") that are alternately input. The superimposed signal is recorded as a superimposed video signal in a standard video signal format on a video recording device (hereinafter abbreviated as VTR) 5 realized by, for example, a video tape recorder.
The superimposed video reproduction signal reproduced by the VTR 5 is input to the signal demodulation device 6, where it is separated into an alternative signal and a left shutter control signal and a right shutter control signal, which are signals for shutter switching. The alternative signal output from the signal demodulator 6 is transmitted to a video display device (hereinafter abbreviated as CRT) 7 realized by, for example, a cathode ray tube.
Above, left and right video information is displayed alternately in a vertical synchronization cycle. Further, the left shutter control signal SL and right shutter control signal SR outputted from the signal demodulator 6 are transmitted to the left eye of a stereoscopic shutter device 12 having left and right shutter means driven to pass/block light. Compatible left shutter 12a
The right shutter 12b corresponding to the right eye is opened and closed, respectively. This shutter device 12 is placed in front of the video display device 7. Note that it is convenient to make the stereoscopic shutter device 12 in the shape of glasses, etc., and to realize the shutter means by a liquid crystal, since it can be made smaller and lighter. FIG. 2 is a diagram showing left and right images displayed on the CRT 7 and an example of how the stereoscopic shutter device 12 is opened and closed. As shown by the two-dot chain line A
When the left image 7a is displayed on the CRT 7,
The left shutter control signal SL output from the signal demodulator 6 opens the left shutter 12a of the stereoscopic shutter device 12, and the right shutter 12b is closed. That is, the viewer sees the left image 7a with his left eye. Similarly,
The right image 7 is displayed on the CRT 7 as shown by the two-dot chain line B.
When the image 7b is displayed, the left shutter 12a is closed, the right shutter 12b is opened, and the viewer sees the right image 7b with his right eye. FIG. 3 is a block diagram showing the configuration of the signal superimposing device 4. As shown in FIG. The signal superimposition device 4 includes a switch SW3 that switches the video signals input from the right imaging device 2 and the left imaging device 3, a switching control circuit 14 that controls the switch SW3, and a mode that specifies the switching mode of the superimposition switch 13. A superimposed signal generator 17 that generates a shutter control signal for controlling the opening/closing operation of the left and right shutters of the stereoscopic shutter device 12 in response to the ON/OFF states of the switch SW1 and SW2 of the switching switch 18 and the superimposing switch 13; , a superimposition device 15 that superimposes the video signal and the shutter control signal;
It is composed of an amplifier 16 that amplifies the superimposed signal. The right video signal and the left video signal from the right imaging device 2 and the left imaging device 3 are synchronized and input to terminals e and f of the switch SW3, respectively. The switch SW3 is operated by the switching control circuit 14 at the vertical synchronization period of the synchronously input left and right video signals.
Switched by. Note that the switching control circuit 14
is synchronized with the vertical synchronization signal of the input left and right video signals. Therefore, at the terminal g of the switch SW3, the left and right video signals inputted to the terminals e and f appear alternately for each field in time series. On the other hand, a mode changeover switch 18 is connected to the superposition switch 13, and controls switch SW1 and switch SW2 of the superposition switch 13.
That is, the mode changeover switch 18 has four mode changeover positions, for example, an alternative mode position 18a, a fully open mode position 18b, a left open mode position 18c, and a right open mode position 18d. has a parallel mode position 18a- and a cross mode position 18a-. The details will be described later. The alternative mode position 18a is the switch SW1 and switch SW2 of the superimposition switch 13.
Fully open mode 18b is switched alternately.
Turn on both SW1 and switch SW2, and for left open mode 18c, turn on only switch SW1,
In the right open mode 18d, only switch SW2 is turned on. In other words, if switch SW1 is ON,
If the left shutter 12a of the stereoscopic shutter device 12 is open and the switch SW2 is ON, the right shutter 1 is opened.
Shutter control signal SL to control 2b to open,
SR is generated by a superimposed signal generator 17. Further, when the switches SW1 and SW2 are both OFF, shutter control signals SL and SR are generated to operate the left and right shutters 12a and 12b to close. The superimposed signal generator 17 is synchronized with the vertical synchronization period of the input left and right video signals. The left and right video signal sequences, that is, the alternative signals, which appear alternately at the terminal g of the switch SW3, and the left shutter control signal generated by the superimposed signal generator 17
SL and right shutter control signal SR are superimposed device 1
5 and sent to an amplifier 16.
The superimposed signal is amplified in an amplifier 16,
It is recorded on the VTR 5 which is output as a superimposed video signal. FIG. 4 is a diagram schematically representing the alternative signal appearing at the terminal g of the switch SW3. In the figure, H indicates the horizontal scanning period, V ₁ , V ₂ , V ₃ , . . .
represents the vertical scanning period. FIG. 5 is a waveform diagram of the superimposed video signal and the signals contained therein. The superimposed signal will be explained below with reference to FIGS. 4 and 5. Here, Table 1 below is
It shows the switching of switches SW1 and SW2 of the superimposition switch 13 and the corresponding shutter operation. The superimposed signal generator 17 includes a pair of switches SW
In response to the outputs of SW1 and SW2, the 2-bit serial coded shutter control signals SL and SR are sent to the fifth
Periods A1 and A preceding periods F1L, F2R, and F3L during which the left and right video signals in FIG. 1 are derived.
2. Superimpose on A3.

[Table] Figure 5 1 shows the vertical synchronization signal. Vertical scanning period
V ₁ , V ₂ , V ₃ , ... are vertical scanning blanking periods W ₁ , W ₂ ,
W ₃ ,... and one field period F ₁ , F ₂ , F ₃ ,...
Consists of. Switching of switches SW1 and SW2 is performed during vertical scanning retrace periods W ₁ , W ₂ , W ₃ , . . . .
This vertical synchronization signal is input to the switching control circuit 14 and the superimposed signal generator 17, and switching of these switches SW1, SW2, and SW3 is synchronized with the vertical synchronization signal. FIG. 2 shows an alternative signal. That is, the left video signal and the right video signal are alternately output for each field. FIG. 3 shows the waveforms of the shutter control signals SL and SR generated by the superimposed signal generator 17. When switch SW1 of the superimposition switch 13 is ON, the shutter control signals SL and SR are pulsed with a constant width and level after t _L seconds from the rise of the vertical synchronization signal.
When SL is generated and switch SW2 is ON, a pulse SR with a constant width and level is generated t _R seconds after the rise of the vertical synchronization signal. That is, pulse SL is a left shutter control signal and pulse SR is a right shutter control signal. In the operation shown in FIG. 5, in the period A1 preceding the period F1L of the left video signal in one field period F1,
Since both the shutter control signals SL and SR are generated as shown in FIG. 5, both the left and right shutters 12a and 12b open as shown in FIG. From the table, both switches SW1 and SW2 are in the ON switching state. In the field period F2R in which the right video signal R is generated, the shutter control signal SR is generated and the right shutter 12b is opened, and in the next field period F3L, the left shutter 12a in which the shutter control signal SL is generated is opened. Parallel alternative modes are achieved. In the field period F2R, if the shutter control signal
When SL is generated and the shutter control signal SR is derived in the field period S3L, the crossed alternative mode can be achieved;
Such an operation can be achieved by operating the mode changeover switch 18 depending on the switching state of each field of the switches SW1 and SW2. As described above, the signals shown in FIGS. 1 to 3 are synchronously superimposed by the superimposition device 15, resulting in a superimposed video signal as shown in FIG. 4. Note that the pulses SL and SR are generated in a period from 10H (here, 1H is one horizontal scanning period) after the rise of the vertical synchronization signal to the rise of the video signal. FIG. 6 shows parallel mode 18a in alternate mode 18a and crossed mode 18.
A stereoscopic viewing system corresponding to a- is shown. 1 shows a stereoscopic viewing system called a parallel type, and the mode of the mode changeover switch 18 is set to parallel mode 1 of the alternative mode 18a.
This is realized when switching to 8a-. That is, by repeating the above-described cases of field 2 and field 3 alternately, the left eye always sees the left image 7a, and the right eye always sees the right image 7b. This allows the viewer to
For example, you can see a video of the levitation in Figure 7. FIG. 2 shows a stereoscopic viewing system called a cross type, which is realized when the mode of the mode changeover switch 18 is switched to the cross mode 18a-. That is, the parallel mode 18a described above
It is sufficient to shift the switching operation of the superimposition switch at - by one field. Then, the pulse SL, which is the left shutter control signal, will be superimposed on the right video signal, and the pulse SR, which is the right shutter control signal, will be superimposed on the left video signal, and the left eye will always see the right video 7b. , the right eye always sees the left image 7a.
can be seen. In this case, unlike in the parallel case, the left and right images are oppositely viewed, allowing the viewer to view the image on the CRT 7, for example. Next, when the mode of the mode changeover switch 18 is changed to the full open mode 18b, both the left shutter control signal and the right shutter control signal will be superimposed within the entire field of the alternative signal, and the stereoscopic shutter will be The shutters of the device 12 will be opened on both the left and right sides. For example, the subject 1 photographed by the right imaging device 2 and the left imaging device 3
If is a flat surface, there is no need to take the trouble to view it in the alternative mode 18a, but in the fully open mode 18b.
The amount of light entering both eyes is doubled when viewed with
It becomes brighter overall. Also, for example, from the alternative mode 18a to this full open mode 18b.
When switching to , the 3D image becomes a 2D image, improving the effectiveness of the television receiver. In addition, when the mode changeover switch 18 is switched to the left open mode 18c, the pulse S, which is the left shutter control signal, is applied only to the field with the left video signal of the alternative signal, which is the left and right video signal sequences arranged alternately. _L may be superimposed. As a result, the stereoscopic shutter 12 is always the left shutter 12.
a opens and the right shutter 12b closes, so that the viewer can always see the left image 7a photographed by the left imaging device 3 with his left eye. Similarly, when switching to the right open mode 18d, the viewer always sees the right side image 7b photographed by the right side imaging device 2 with the right eye. As described above, by switching the mode changeover switch 18, the viewer can view either the raised image, the retracted image, the flat image, the left image, or the right image according to the viewer's request. I can do it. Effects As described above, according to the present invention, the 2-bit serial coded shutter control signals SL and SR are applied to each position 18a-, 18a of the mode changeover switch 18.
-, 18b, 18c and 18d, a pair of superimposition switches SW1, SW2
This makes it possible to send out a stereoscopic video signal in which the shutter control signals SL and SR are superimposed on the left and right video signals. On the transmitting side, the manner in which the video signal is viewed can be controlled in accordance with each of the positions, improving convenience.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing left and right images displayed on the CRT 7 and an example of the open/closed state of the stereoscopic shutter device 12, and FIG. 3 4 is a block diagram showing the configuration of the signal superimposing device 4, FIG. 4 is a diagram schematically representing the alternative signal appearing at the terminal g of the switch SW3, FIG. 5 is a waveform diagram of the superimposed video signal and the signals contained therein, FIG. 6 is a schematic diagram for explaining the parallel type and the crossed type. 1... Subject, 2... Right imaging device, 3... Left imaging device, 4... Signal superimposition device, 5... VTR,
6... Signal demodulator, 7... CRT, 12... Stereoscopic shutter device, 13... Superimposition switch, 1
4...Switching control circuit, 15...Superimposition device, 16...
Amplifier, 17...Superimposed signal generator, 18...Mode changeover switch, 18a...Alternative
Mode, 18a-...Parallel mode, 18a-
...Cross mode, 18b...Full-open mode, 18c
...Left open mode, 18d...Right open mode.

Claims (1)

[Scope of Claims] 1. A means 3 for generating a left video signal, a means 2 for generating a right video signal, and a left video signal from the left video signal generating means 3 and a right video signal generating means 2. A video signal change-over switch SW3 that alternately switches and derives a right-side video signal for each field, a pair of superimposition switches SW1 and SW2, and a mode change-over switch 18, comprising: (a) a video signal change-over switch SW3; Before the left video signal is derived for each field, one of the pair of superposition switches SW1 and SW2 is turned on.
1 as ON/OFF switching state,
The other superimposition switch SW2 is set to the other switching state, and prior to the right video signal being derived, one of the superposition switches SW1 is set to the other switching state, and the other superposition switch SW2 is set to the one switching state. Alternative mode position 18a- and (b) a pair of superimposition switches SW before the left video signal is derived from the video signal changeover switch 3 for each field.
1. Turn one of the superposition switches SW1 out of SW2.
The other switching state is set to ON/OFF, the other superimposition switch SW2 is set to one switching state, and before the right video signal is derived, one of the superimposition switches SW1 is set to the one switching state, and the other superimposition switch Cross alternate mode position 18a- in which SW2 is set to the other switching state; and (c) the pair of superimposition switches SW1 and SW2 are set to the one switching state for each field from the video signal changeover switch 3. fully open mode position 18b, and (d)
Left-open mode position 18c where one superimposition switch SW1 is kept in one switching state and the other superposition switch SW2 is kept in the other switching state.
and (e) right-open mode position 1 in which one superimposition switch SW1 is kept in the other switching state and the other superposition switch SW2 is kept in one switching state.
8d, and a pair of superimposition switches SW for each field.
1, generating means 17 for generating 2-bit serial coded shutter control signals SL, SR in response to the output of SW2; and shutter control signals SL, SR from the generating means 17;
are the periods F1L, F2R, during which the left and right video signals of the video signal changeover switch SW3 are derived.
A stereoscopic video signal sending device characterized in that it includes a superimposing means 15 for deriving a superimposed stereoscopic video signal during periods A1, A2, and A3 prior to F3L.