JPH0496492A - Stereoscopic television receiver - Google Patents

Abstract

PURPOSE:To obtain a high-quality picture not to require the means of scanning and conversion by alternately extracting a right or left picture signal for each field and supplying the signal by driving an imaging device according to a 4:1 interlace scanned synchronizing signal. CONSTITUTION:Right and left television cameras 35 and 34 constituting a stereoscopic camera part are driven in common according to the output synchronizing signal from a double velocity 4:1 interlace synchronizing signal generator 36. Based on a switching pulse from the generator 36, an image pickup output signal is changed over for each field by a switch SW1, and field sequentially stereoscopic television signals L1 R2 L3 R4 are obtained. Electronic shutter glasses 38 are alternately turned on/off and driven by a driver 38A based on double velocity VD from the generator 36. Thus, the stereoscopic television picture having high picture quality can be obtained by simple configuration.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention sequentially displays left and right images on a display means in a time-sharing manner, and in synchronization with this, alternately opens and closes shutters for the left and right eyes. The present invention relates to a stereoscopic television device that displays the display means stereoscopically through the shutter.

[Summary of the Invention 1 This invention sequentially displays left and right images on a display means in a time-sharing manner, and in synchronization with this, alternately opens and closes shutters for the left and right eyes to view the display means stereoscopically. In a stereoscopic television device, a synchronizing signal for 41 interlace is generated, a television camera is driven by this signal, a double-speed field sequential stereoscopic television signal (compared to the conventional one) obtained is displayed on a display means, and the The electronic shutter for the left and right eyes is alternately opened and closed in synchronization with the display, and the display means is viewed stereoscopically through the electronic shutter. The aim is to provide a 3D television device with high image quality.

[Prior art j] Conventional time-division stereoscopic television equipment utilizes interlaced scanning of television to provide 60Hz
The left and right images can be alternately switched with a field period of
Devices have been devised that prevent the occurrence of flicker and decrease in vertical resolution by shifting the phase by H (H: horizontal scanning period) or using 4:1 interlaced scanning.

[Problem to be Solved by the Invention 1] Conventionally, in order to solve problems such as the occurrence of 30Hz flicker and a decrease in vertical resolution in time-division stereoscopic television devices, left and right stereoscopic images have to be divided in a time-division manner. After switching, the field frequency is equivalently doubled (120Hz
), and it was necessary to perform scan conversion using digital memory or the like.

For this reason, there are problems in that not only the configuration of the entire stereoscopic television system becomes complicated, but also the price of the device becomes expensive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a high-quality stereoscopic television apparatus that does not require a scan conversion means such as a digital memory.

[Means for Solving the Problems 1] In order to achieve such an object, the present invention sequentially displays left and right image signals on a display means in a time-sharing manner, and displays left and right image signals in synchronization with the display. In a 3D television device that alternately opens and closes shutters for 4:1 interlace scanning, the 3D television camera generates the pressure and right image signals by driving an image sensor with a 4:1 interlace scanned synchronization signal, and the 3D television camera generates the left and right image signals from the 3D television camera. Alternatively, the present invention is characterized by comprising means for alternately extracting the right image signal for each field and supplying it to the display means.

[Function] According to the present invention, a stereoscopic television camera is driven by a double-speed synchronous signal subjected to 4:1 interlaced scanning with the above configuration,
The left and right images are switched and combined for each field to generate a 3D television signal in double-speed field sequence. Then, by displaying this signal on a display and alternately opening and closing the electronic shutters of the left and right eyes in synchronization with the display, a stereoscopic television image can be obtained.

[Example] The principle of the present invention is shown in FIGS. 1(a) to (d).

First, a synchronizing signal is generated that has a scanning speed approximately twice that of the current television system (double speed) and is capable of 4:1 interlaced scanning. This synchronization signal has 262.25 scanning lines per field, and the phase is shifted by 1/4 of the horizontal scanning period for each field. form an image. At this time, the horizontal frequency is set to 31.43856 K
If you select Hz and vertical frequency as 119.88Hz, 4
One image made up of fields consists of 1049 scanning lines.

Figures 1 (a) and (b) show the scanning lines for each field in the left and right camera output image signals when scanning is performed using such a synchronization signal (Figure 1 (
a) shows the left camera output image signal, which is indicated by L+, L2, . . . in order from the first field. FIG. 1(b) shows the right camera output image signal, in which R, R,
, R2... In the figure, A indicates a scanning line), and FIGS. 1(c) and (d) are FIG. 1(a).

Each left and right camera output image signal as shown in (b) is
This figure shows the scanning line structure of a stereoscopic image signal that is alternately switched and synthesized for each field.

As can be seen from Fig. 1(d), the left and right image beams, →R2
→ L3 → R4 are interlaced 4:1, and both the left image and the right image are 2:J interlaced.

Therefore, by alternately opening and closing the electronic shutter glasses in synchronization with a field period of approximately 1/120 seconds, a 2:1 interlaced flicker consisting of 1.049/2 scanning lines can be generated for the left and right eyes, respectively. Not the left and right images are seen, so a stereoscopic image can be seen. FIG. 2 shows an example of the configuration of a double-speed 4:1 interlaced synchronization signal generator used in the present invention, and FIG. 3 shows a timing diagram of the synchronization signal.

In FIG. 2, 1 is a PLL circuit that receives the standard horizontal synchronizing pulse HD (S) of the NTSC system, and includes a phase detector 2 and a low-pass filter (LPF) 3.66.020.
979MHz crystal voltage controlled oscillator (VCO)
4.1/4] A6 consisting of a 96 frequency divider 5 inputs the standard horizontal synchronizing pulse HD (S), the standard vertical synchronizing pulse VD (Sl) of the NTSC system, and the output signal of the PLL circuit I) 7 This frame phase adjustment circuit consists of two D flip-flops 7.8, an AND gate 9, a field counter 10, and a phase adjuster 11, and outputs field pulses.

12 is a horizontal (11) system ROM address counter, 13
is the vertical (■) system ROM address counter, and 14 and 15 are the count outputs of the address counter 12,
Horizontal blank pulses H, B corresponding to the horizontal blanking period
1. ．． Read K H, BLKROM and horizontal synchronization signal H, 5YNC without reading H, SYNCROM, 1
6, 17, 18 and 19 are FV (3H) ROMs that read out signals indicating a period of 3H from the start of each field according to the count output of the address counter 13; ) ROM, vertical blanking pulse V indicating vertical blanking period, V reading BLK, BLKROM
, and vertical synchronization signal V, V to read 5YNC,
It is SYNCROM.

20 is a composite synchronous synthesis circuit, H, BLKROMI
5, V, BL that synthesizes pulses from BLKROM18 and outputs composite blank pulse BLK (double speed BLK)
K synthesis circuit 21, H, SYNCROM 15 and FV
(3H) A gate 22 that outputs a frame pulse based on the pulse from ROMI 6, an equal counter 23 that outputs a pulse FLD indicating an even or odd field 3H after the field start, and H, SYNCRO.
MI5, VD (9HIROMI7 and V, SY
Synchronize the pulses from NCROM19 and generate the synchronization signal 5YN
5 that outputs C (double speed 4:1 interlace 5YNC)
It consists of a YNC synthesis circuit 24.

25, 26.27.28.29 are inverters, 30.3
1.32.33 is a voltage conversion buffer; 25.
From 30 onwards, double speed B1. , K, from 26.31 to H,5
Based on YNC (double speed horizontal sync pulse HD, FLD from 27, double speed 4:1 inter 1z from 28.32)
- output 5YNC from 29.33 and double speed VD from 29.33.

FIG. 4 shows an example of the configuration of a stereoscopic television apparatus according to an embodiment of the present invention. As shown in the figure, the left and right television cameras 34 and 35 constituting the stereoscopic camera section output a synchronization signal 5YNC from a double speed 4;1 interlace synchronization signal generator 36.
Drive in common. Based on the switching pulse FLr from the generator 36, the image pickup output signals from the left and right cameras 34 and 35 are switched field by field by the switch SWI, and a stereoscopic television signal is generated in field sequential order.
2→L3→R1... (see FIG. 1) is obtained. The time-division field sequential stereoscopic television signals obtained in this manner are displayed on a stereoscopic TV display device 37, and are viewed stereoscopically by wearing electronic shutter glasses 38. In this case, the stereoscopic TV display device 37 receives the double-speed 4:1 interlace synchronization signal 5YN from the generator 36 described above.
Operate at C (horizontal sync frequency = 31.43856k
t(z, vertical synchronization frequency: 119.88Hz). The electronic shutter glasses 38 are turned on and off alternately every 1/120 seconds and are driven by a driver 38A based on the double speed VD from the generator 36.

In addition, the field sequential/simultaneous converter 39 in FIG.
is a circuit for converting the above-mentioned field-sequential stereoscopic television signal into simultaneous signals of the left image (1,) and right image (R) based on the double-speed synchronization signal 5YNC and the double-speed VD from the generator 36. This is for recording stereoscopic images on TV type VTRs 40 and 41, and supplying them as left and right image signals to a polarized glasses type stereoscopic TV display.

The circuit configuration of the converter 39 is detailed in FIG.

The field-sequential stereoscopic television signals L1→R2→L3→R4 from the left and right television cameras 34, 35 are converted into digital signals through a pre-LPF C low-pass filter 42 and an A/D converter 43. 17 by operating SW2 to SW4 based on the signal from the switching pulse generator 44 which receives the double speed VD from the generator 36 as input.
Every 120 seconds, data is written in the order of 1st → 3rd → 2nd → 4th field memory 45.47, 46.48. The frequency of the clock signal for writing is 8f, eX 1049
/1050, where fllc is the color subcarrier frequency), which is the double-speed synchronization signal 5 from the generator 36.
Memory R (read)/W (write) with YNC input
It is supplied from the controller 49 to each memory 45-48.

On the other hand, from these field memories 45 to 48, based on the signal from the switching pulse generator 44,
5 (interlocked with SW3) to SW6 (interlocked with SW4), the left image is transferred from the first to second field memories 45 and 46 in the current TV system field period of approximately 1760 seconds.
In this order, the right image is stored in the third to fourth field memories 47.
The signals are read out in the order of 48, converted into analog signals by D/A converters 50 and 51, and output as left and right image signals through post-installed LPFs 52 and 53, respectively. At this time, D/
The frequency of the clock signal of the A converter 50.51 is 4f,
, and so on.

FIG. 5 shows another embodiment of the present invention, in which instead of using two TV cameras on the left and right as shown in FIG. 4 in the stereoscopic camera section, an optical system configuration as shown in FIG. 5 is used. In this way, the field-sequential stereoscopic television signal described above can be obtained using one television camera. In FIG. 5, liquid crystal shutters 54 and 55, which correspond to the electronic shutter glasses described above, are inserted into the optical paths of lenses A and B. This electronic shutter 54,55 is activated by a switching pulse 56 from a circuit similar to driver 38A in FIG.
It turns on and off alternately every second.

The optical image from lens B is reflected by a mirror 57 and coaxially combined with the optical image from lens A by a half prism 58, and an image sensor 59 (4x speed) interlace synchronization signal 5
, R2, I, 3 . R4... is obtained. Note that the distance d between the two lenses A and B is adjusted so that an appropriate stereoscopic image can be obtained.

As described above, in the present invention, a stereoscopic television camera is driven with a double-speed synchronous signal subjected to 4:1 interlace scanning, and left and right images are switched and combined for each field to generate a stereoscopic television signal in double-speed field sequence. By displaying this signal on the display and alternately opening and closing the electronic shutters of the left and right eyes in synchronization with the display, scan conversion circuits such as digital memory are no longer required, simplifying the system configuration and reducing costs. Not only can it be realized, but also a high-quality stereoscopic television image can be obtained without, for example, 30 Hz flicker or a decrease in vertical resolution. In addition, by using a field sequential-simultaneous signal conversion circuit, it is possible to convert double-speed field sequential 3D television signals into the current system's two-channel left and right 3D television signals. It can be used as a TV display signal.

[Effect of the Invention 1] As explained above, according to the present invention, high-quality stereoscopic television images can be obtained with a simple configuration.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle of the stereoscopic television device of the present invention, Fig. 2 is a diagram showing a configuration example of a double-speed 4:1 interless synchronization signal generator, and Fig. 3 is a diagram showing a configuration example of a double-speed 4:1 interless synchronization signal generator. FIG. 4 is a diagram showing a configuration example of a 3D television apparatus of the present invention. FIG. 5 is a diagram illustrating a configuration of another embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration example of a field sequential/simultaneous converter for television signals. 34.35...Camera, 36...Double speed 4; 1 interlace synchronization signal generator, 37...3D TV display, 38...Electronic shutter glasses.

Claims (1)

[Claims] 1) A stereoscopic television device that sequentially displays left and right image signals on a display means in a time-sharing manner and alternately opens and closes shutters for the left and right eyes in synchronization with the display, comprising: :
a stereoscopic television camera that generates the left and right image signals by driving an image sensor with a synchronization signal obtained by interlaced scanning; and a stereoscopic television camera that alternately extracts left or right image signals for each field from the stereoscopic television camera and displays them on the display means. A stereoscopic television device characterized by comprising: supplying means. 2) The three-dimensional television camera is composed of one television camera having two lens systems for left and right, the optical images of each lens system are captured by one imaging means via a combining means, and 2. The stereoscopic television apparatus according to claim 1, further comprising an optical shutter inserted in the optical path of each lens system, the optical shutter being alternately switched on a field-by-field basis in accordance with the 4:1 interlace scanning synchronization signal. 3) The supply means writes the signal taken out from the stereoscopic television camera into the field memory using the 4:1 interlace scanning synchronization signal, and writes the left and right image signals of two channels from the field memory using another synchronization signal. 2. The stereoscopic television apparatus according to claim 1, further comprising means for reading the signals as simultaneous signals.