JPS6048691A - Steroscopic picture reproducing system - Google Patents

Abstract

PURPOSE:To simplify the device and alos to utilize the existing television broadcast system and video recording reproducing system as they are by separating a picture for a left eye and a right eye the division of picture elements. CONSTITUTION:The two fields by interlacing scanning in the existing television system are used for the picture elements for the left eye and the right eye as they are. That is, in the television system the scanning of a picture changed at nearly each 1/30set i.e., frame scanning is executed by in total two field scannings of vertical scanning lines 14 shown in solid lines in Fig. and vertical scanning lines 15 shown in broken lines between the scanning lines 14. Since the two field scannings scan different position on a screen, it is possible to assign the solid lines as the picture elements for the left eye and the broken lines as picture elements for the right eye. In this case, in taking notice to one of the left or right eye picture elements, the space frequency and the time frequency are halved in comparison with the conventional television screen, but this is compensated by the effect of the visual synthesis of the left and right pictures and the effect of afterimage, and the picture is not deteriorated much.

Description

[Detailed Description of the Invention] (1) Description of the field to which the invention pertains The present invention relates to a stereoscopic image reproduction method using polarized glasses, and in particular to a method that allows stereoscopic images to be easily obtained on televisions and display terminal devices. be.

(2) Description of conventional technology Methods for obtaining stereoscopic images can be classified as follows: - Stereoscopes such as the polarized glasses method or dichroic glasses method that uses binocular parallax and radiation effects invented by Wheatstone;
■A method using a cylindrical lens plate, that is, a lenticular plate, developed from Lippmann's invention using a compound eye lens plate,
(2) Holography, a method in which a screen or concave mirror is used to capture images around 0.

However, in method (2), the angular range in which an observer can view stereoscopically is narrowly limited. In addition, high precision is required to create the screen, and it is difficult to reproduce natural scenes.

In addition, with holography (2), it is difficult to reproduce bright color images, and the equipment is complicated and expensive.

Since the amount of information is extremely large, it is difficult to record, transmit, play video, etc. Furthermore, method (2) has the disadvantage that it is difficult to reproduce natural scenes and the three-dimensional effect is also limited.

On the other hand, the stereoscope method described in ■■.

The bright, high-resolution images have good image quality and excellent three-dimensional effect, and the permissible range of viewing directions is wide, so many people can view them at the same time.The amount of information is only twice that of a flat image, so video playback is possible. It has the advantage of being easy to use. For this reason, stereoscopes using polarized glasses have been very effective in movies and the like. In movies, it is possible to project images using two orthogonal polarizations using separate projectors.

Since a single cathode ray tube serves as the light emitting surface of a television, it is difficult to use a polarization method, and the following three-dimensional televisions have been devised in the past.

(1) Red-blue glasses method: This is a method in which left-eye and right-eye images are separated based on color tone rather than polarization. This method is 9
Because it is difficult to separate images, images tend to appear double, and 1
However, red and blue filters are used for the left and right eyes, respectively, which is not good for visual hygiene.

(2+2 CRT method (Reference: H, RoJohnsto
n, C, A.

Hermanson and H.L., Hull;
8tereo television for rem
otecontrol, ”Electronics
, p, 12 [1, January 1951):
In Figure 1.

The outline structure is shown below. In the figure, 1 is an image display device for the left eye, 2 is a polarizing plate for the left eye, 3 is an image display device for the right eye, 4 is a polarizing plate for the right eye, 5 is a semi-transparent mirror, and 6 is polarized glasses. As shown in the figure, polarizing plates 2 and 4 are placed perpendicular to each other in front of two image display devices 1° for the left eye and for the right eye.

This is a method in which the screens of two display devices are simultaneously observed through polarized glasses 6 through a semi-transparent mirror. However, this method has the disadvantage that the equipment is bulky and expensive.

(3) Polarized projection type 3D television (Reference: Mineo Noda; “Medical 3D X-ray television” Television Society Journal vol.
25. Floor 5. p, 388. May 1971): Figure 2 shows its general structure. In the figure, 6 is polarized glasses, 7 is a television camera, 8 is an eyehole tube, 9 is a rotating polarizing plate,
10 is a screen, 11 is a left/right discrimination circuit.

12 is a phase controller. Note that the arrows shown in the one-turn polarizing plate 9 indicate the polarization direction.

As shown in the figure, a rotating polarizing plate 9 is placed in front of an idle hole tube 8 that converts a television image into a projected image.

The polarization state of the left-eye and right-eye images, which are displayed alternately in a time-division manner, is controlled synchronously by the left-right discrimination circuit 11 and the phase controller 121C to change the polarization state. The polarized glasses 6 allow the viewer to view the left-eye and right-eye images only with the left and right eyes. This method is.

Ordinary cathode ray tubes and solid-state image receiving elements cannot be used.

A large-scale projection type device is required, and the device is also expensive.

As described above, the conventional three-dimensional television system has the disadvantage that the device inevitably becomes larger and more complicated, and the cost increases.

(3) Purpose of the Invention In order to eliminate these drawbacks, the present invention separates left-eye and right-eye images by pixel division.The purpose of this invention is to simplify the device, especially to improve the performance of the existing television broadcasting system. The object of the present invention is to provide a method of using the video recording and playback method as it is. This will be explained in detail below using nine drawings.

(4) Explanation of the groove bottom and function of the invention FIG. 6 is for explaining one embodiment of the present invention.

1 is a diagram illustrating a current interlaced scanning method for television screens; FIG. In the figure, 13 is a display, 14 is a first field scanning line, and 15 is a second field scanning line.

This embodiment is a method in which two fields by interlaced scanning in the current television system are used as pixels for the left eye and right eye. That is, in television, the scanning of the image that changes every 1/second, that is, the frame 0 scanning, is the vertical scanning line 14 (scanning line numbers 1 to 263) shown by the solid line in FIG. 3, and the vertical scanning shown by the broken line between them. A total of two field scans of line 15 (scanning line numbers 266' to 525') are performed.

Therefore, since the two field scans scan different locations on one screen, it is possible to allocate the solid line portion to the left eye pixel and the broken line portion to the right eye pixel L7. In this case, if we focus on either the left eye or right eye image, the spatial frequency and temporal frequency are half that of a normal TV screen, but
This is compensated for by the effect of visual composition of the left and right images and the effect of afterimages, and the quality of the two images is not significantly impaired.

Next, there is a method for controlling the polarization of two pixels, and a simple method is to attach a polarizing filter to the CRT surface. In this example, a polarizing film that transmits linearly polarized light is attached to the 263 strips scanned by solid lines in FIG. It should be installed on. This step is simply added to the current receiver manufacturing process.

The price of the receiver, ie, the increase in the burden on the viewer, is small.

Another example of a pixel polarization control method is a method using a metal grating. It is known that the light that travels along a layer in a metal IN with a period comparable to or less than the wavelength of light is limited to one linearly polarized light. Therefore, by attaching a grating made of periodic metal wire strips to each pixel using a technique such as photo-injection graphing, it is possible to define the polarization direction of the light emitted from the two pixels.

However, when using a liquid crystal display as a screen, polarization control is also possible by placing a grating-like metal reflector under the liquid crystal cell instead of the normally used transmissive polarizing window.

Next, in order to combine the two stereoscopic television images (No. 5) required for this embodiment, it is necessary to use two cameras and switch them alternately. Fig. 4 shows an overview (II configuration). During,
16 is a left eye camera, 17 is a right eye camera, and 18 is a video signal switching device. t'

FIG. 5 shows the composite video signal obtained in this manner. In the figure, 19 is a horizontal synchronization signal.

20 is a left eye video signal, 21 is an equalization pulse, 22 is a vertical synchronization signal, and 23 is a right eye video signal.

The first field corresponds to the signal output from the left eye camera 16, and the second field corresponds to the signal output from the right eye camera 17.

These techniques can be easily implemented by current broadcast stations. Further, by using a camera in which the left and right cameras are integrated, it is possible to reduce the complexity of the device even as a camera for business or consumer use. Current video equipment can be used as is.

In the embodiments described above, the spatial and temporal frequencies of the left or right eye screen are halved, but other pixel division methods can reduce this negative effect.

Figure 6(al) and (bl) respectively show the pixel division method and the corresponding composite video signal in other embodiments.As shown in Figure ta+, one horizontal scan is further divided into pixels for the left eye. and pixel R for the right eye.

Because pixels are divided into a grid pattern both horizontally and vertically.

The effect of visual synthesis of the left and right images is further enhanced. Also.

Since both left and right images always exist in any field scan in terms of time, the motion of the moving image is smooth.

The above is an explanation of an embodiment emphasizing that the current method is not changed as a second aspect of the present invention.

The present invention is even more effective when applied to high-quality, high-definition televisions. That is.

With higher resolution and larger screens, the three-dimensional effect and sense of presence are further enhanced.

Furthermore, the present invention can be applied not only to televisions but also to terminal display devices such as computers or communication equipment. The scanning method is not limited to the current scanning method of televisions, and may be a completely different scanning method. The image surface is applicable not only to cathode ray tubes and image pickup tubes, but also to all kinds of displays such as solid-state displays, liquid crystal displays, plasma displays, and screens. Furthermore, by using printing technology to print different polarizing plates on pixels, application to publications is also possible.

(5) Description of effects As explained above, according to the present invention, the left-eye image and the right-eye image are separated by pixel division, and the video signal for this purpose is also electrically switched between the left and right cameras to create a stereoscopic image. Therefore, it can be easily applied to current TVs, display terminals, etc.

At that time, the complexity and size of the device can be significantly suppressed. In particular, when applied to televisions, no changes are required to the broadcasting system, receiver, or video equipment other than providing polarization characteristics to the image receiving surface. Furthermore, it can be applied to high-definition televisions and printed matter, and has the advantage of having a wide range of applications.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional 2CRT system, Fig. 2 is a schematic diagram of a conventional polarized projection stereoscopic television, and Fig. 3 is an explanation of interlaced scanning in a current television to explain an embodiment of the present invention. 4 is a schematic diagram of an imaging device for obtaining a video signal of this embodiment, FIG. 5 is a waveform diagram of a composite video signal corresponding to the embodiment shown in FIG. 3, and FIG. An explanatory diagram showing a pixel division method in another embodiment of the present invention, and (b) is a waveform diagram of a corresponding composite video signal. In the diagram, 1 is an image display device for the left eye, and 2 is a diagram for the left eye Polarizing plate, 3 is an image display device ik for the right eye. 4 is a polarizing plate for the right eye, 5 is a semi-transparent mirror, 6 is polarized glasses. 7 is a television camera, 8 is an eyehole tube, 9 is a rotating polarizing plate, 10 is a screen, 11 is a left/right discrimination circuit, 12 is a phase controller, 13 is a display, 14 is a first field scanning line, 15 is a second field scanning line, 16 is a left eye TV camera, 17 is a right eye TV camera, and 18 is a video signal. Switching device. 19 is a horizontal synchronization signal, 20 is a left-eye video signal, 21 is an equalization pulse, 22 is a vertical synchronization signal, 26 is a right-eye video signal, L is a left-eye pixel, and R is a right-eye pixel. Patent Applicant: Hiroshi Mori, Patent Attorney, Nippon Telegraph and Telephone Public Corporation

Claims (1)

[Claims] The screen is broken down into fine pixels, and the pixels are classified into left-eye or right-eye pixels so that left-eye pixels and right-eye pixels are almost uniformly distributed. In the image display device, the left-eye pixel displays only one polarized light out of two orthogonal polarized lights. A three-dimensional image reproduction method characterized in that the pixel for the right eye outputs an image by emitting only the other polarized light.