JPS63215284A - Stereoscopic image display device - Google Patents

Abstract

PURPOSE:To obtain a light video image without flickering on a large-sized screen by separating completely one video signal into the right system and the left system, inserting the just preceding video signal to drop-out parts of video signal in the right and left systems to guarantee the left and right image synchronization completely. CONSTITUTION:An odd field and an even field are separated from a signal A by a field separating device 32 and a right video signal B and a left video signal C are obtained. When a video signal from the field separating device 32 is sent by one field, field memories 33a, 33b write and store the signal and read and output it at the next one field time band and the right/left video signals are given respectively to the memories. A synchronizing controller 35 manages whether the field memories 33a, 33b are operated in the write mode or the read mode based on the synchronizing signal.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a stereoscopic image display device for stereoscopically displaying images shot by a video camera.

<Prior Art> Conventionally, the most common method for photographing actual scenery with a television camera and displaying it three-dimensionally is as shown in FIG.
Two systems of playback devices 6a and 6b and projectors 8a and 8b are provided, and two images are simultaneously projected onto the screen 10 while being completely synchronized. At this time, a deflection glass, that is, a deflection filter 12 attached to each lens surface of the projectors 8a and 8b at an angle perpendicular to each other.
A and 12b separate the left and right images, and humans use polarized glasses 14 to separate the left and right images and view them with both eyes to obtain a stereoscopic image.

Also, recently, using the principle that one television frame that makes up one screen every 1730 seconds scans the screen twice every 1760 seconds, in an odd field and an even field.
There is a stereoscopic display method that switches and displays left and right images every 1/60 seconds. That is, as shown in FIG. 2, video images taken synchronously by television cameras 2a and 2b are recorded by recording devices 4a and 4b onto a magnetic tape 16a for the right eye and a magnetic tape 16b for the left eye, respectively. In this case, the right eye magnetic tape 16a includes odd fields R,,,R,,,R,,,...,and even fields R,2,R221R321,...,as shown in FIG. 2a. The right eye video signal (a) consisting of the left eye magnetic tape 16 is recorded.
b has an odd field L + + + L 211
L311..., and even field L12. L2□
, L 321 . . . The left eye video signal (b) is recorded.

In the editing work, as shown in the time chart of FIG. 2a, the recording signals of the magnetic tapes 16a and 16b, that is, the right eye video signal (n) and the left eye video signal (b), are converted into a right eye video signal. is an odd field R,,,R2,,
R3,..., even field L1□+ for left eye
L 221 L s 21 . . . are carried, and each odd field and even field constitute one frame to obtain a video signal (c). If the magnetic tape 1.6c containing this video signal (c) is played back by the playback device 6c and displayed on the monitor television 18, a video from a different viewpoint will be displayed every 1760 seconds, and the person viewing this will see the same image. The left and right images appear to be displayed as duplicates at the same time. In order to view this stereoscopically, shutter glasses 22 connected to the reproduction device 6c via a shutter driver 20 are used.

In the shutter glasses 22, the passage of light is controlled alternately on the left and right sides every 1760 seconds in synchronization with the reproduction signal from the reproduction device 6c, and when the image of the left eye is displayed, the shutter glasses 22
When the second shutter 22a is opened and the image of the right eye is displayed, the shutter 22b is opened, and in this way stereoscopic vision can be obtained.

<Problems to be solved by the invention> When comparing the systems shown in Figures 1 and 2, the system in Figure 1 projects left and right images at the same time, so the amount of light is sufficient, and the light from polarized glasses is A bright image with only loss can be obtained on a large screen, making it suitable for viewing by many people at the same time.

However, two-channel video recording media must be edited in perfect synchronization, requiring two playback devices, and perfect synchronization between these two playback devices. This requires careful attention to the device, is cumbersome to handle, and often poses problems.

On the other hand, the method shown in Figure 2 switches between the left and right pictures every 1760 seconds, and because it consists of one video medium and one playback device, there are synchronization problems at the display stage. There is no need to be careful.However, when the image is projected onto a large screen using a projector for viewing by a large number of people, the image on the screen is darker than that of a monitor TV, and the shutter glasses used to view the image in 3D also have extremely high light loss. Furthermore, since both eyes cannot view the image at the same time, the user sees a dark image and cannot obtain a sufficient three-dimensional effect. In addition, from an operational standpoint, cables for shutter glasses are undesirable because they can become entangled when viewed by a large number of people.

This invention was made to solve the problems of each of the above-mentioned systems.
By using a single playback device, the advantages of the system shown in Figure 2 can be utilized to eliminate synchronization problems, and both left and right video signals can be projected simultaneously on the screen, as shown in Figure 1. It is an object of the present invention to provide a stereoscopic image display device that can project bright images on a large screen and be viewed by a large number of people by also adopting the advantages of the method shown in .

Therefore, according to the present invention, one video signal formed by making the right video and left video alternately correspond to the - and other fields in one frame, respectively, is synchronized. In a stereoscopic image display device that obtains a stereoscopic image by reproducing in synchronization with a control signal, the one field signal and the other field signal are separated from the video signal in synchronization with the synchronization control signal, and two systems, left and right, are provided. a field separator that outputs a video signal; and a field memory provided in each of the two left and right video output systems from the field separator and capable of recording and reading in field units in synchronization with the synchronization control signal. , provided for each output of the field memory,
a switch for inserting a readout signal from the field memory into the missing field of the left and right video signals of the field separator in synchronization with the synchronization control signal; By supplying the output from each of the switchers to two projectors, the projector projects the image through polarizing filters having polarization characteristics orthogonal to each other, and the projected image is observed through shoulder-tip glasses. A stereoscopic image display device is provided.

Effects> With the above configuration of the present invention, a video signal reproduced by one reproduction device, that is, a video signal in which left and right images are recorded alternately in units of 1760 fields in one video signal can be reproduced. Then, the field separator separates this signal into left and right video signals again, and then inserts the previous signal into the missing half of each right and left video signal to eliminate the missing part. The right and left video signals obtained in this way are projected through two projectors and polarization filters having polarization characteristics orthogonal to each other, and this projection I try to observe images with polarized glasses.

<Example> An embodiment of the present invention will be described below.

In FIG. 3, 31 is a reproducing device for a video signal recorded on, for example, a recording medium, 32 is a field separator that separates odd and even fields in the video signal, and 33a and 33b are odd and even fields. 34a and 34b are field memories for recording and reading out video signals; 34a and 34b are switchers for switching the video (negative input) in synchronization with the fields; A synchronization control device that synchronizes the entire system, such as writing and reading timing of field memories 33a and 33b, switching synchronization of switchers 34a and 34b, etc., 38a and 38b are projectors, and 40a and 40b are polarized lights having polarization characteristics orthogonal to each other. Glass, 42 is a screen, and 43 is polarized glasses.

Recording media edited using the method shown in Figure 2 include:
Images of the left and cloth are alternately recorded in fields that change every 1760 seconds, and are played back by the playback device 31.

The signal state as time passes is shown as signal (A) in the time chart of FIG. The first field of each frame, that is, the odd field, contains the right image.
The left image is played in the later fields, that is, the even fields, R+1 to R41 and L12 to L, respectively.
42.

The field separator 32 separates the signal (A) into an odd field and an even field and outputs the signal (A) to obtain a right video signal (B) and a left video signal (C). Field separation is performed based on the timing generated for each field from the synchronization control device.

Even if these right video signal (B) and left video signal (C) are directly supplied to the projectors 38a and 38b, projected onto the screen 42 via polarizing filters, that is, polarizing glasses 40a and 40b, and observed with polarized glasses 43, A 3D image can be obtained.

However, the three-dimensional image ('A) obtained by directly feeding the projectors 38a and 38b in this way takes only half the time for each projector compared to the method of projecting the left and right fields simultaneously, as explained in FIG. It is not used and is only 50% efficient.

This invention attempts to reduce flicker and the like by inserting a video signal into the unused half of each projector to increase the amount of light.

The field memories 33a and 33b write and store the video signal when one field is sent from the field separator 32, and read and output it in the next one field time period. The right and left video signals are connected to this as inputs, respectively.

The synchronization control device 35 manages whether the field memories 33a and 33b are set in write mode or read mode based on a synchronization signal. The operating status of each field memory is shown in time charts (D> and (E)).

Therefore, the video signal supplied to each projector is
For example, in the case of the right video, the right video output (B) and every other readout signal of the field memory output (D) are synchronized with the signal (H) from the synchronization control device 35, and at the end of the field, , is a signal (F) formed by being alternately switched by the switch 34b.

Similarly, the left video signal (G) is formed by alternately switching between the video signal (C) and the field memory readout output (E) using the switch 34a.

<Effects of the Invention> As described above, according to the present invention, when reproducing one video signal including a right video signal and a left video signal in one field, a field separator and a pair of field memories are used. , a pair of switchers are provided to completely separate the one video signal into a right system and a left system, and also to completely separate the video signal into a right system and a left system. By inserting the immediately preceding video signal into the missing part of the A signal, right and left video signals are formed, and these video signals are projected and viewed simultaneously by two projectors, so left and right synchronization is achieved. This has the effect that not only is the image quality completely guaranteed, but also that a bright image without flickering can be obtained on a large screen.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram for explaining a simultaneous display stereoscopic display system according to the prior art, FIG. 2 is a block configuration diagram for explaining a time-division stereoscopic display system according to another conventional technology, and FIG. , a timing chart for explaining the operation of FIG. 2, FIG. 3 is a block configuration diagram showing a stereoscopic image display device according to an embodiment of the present invention, and FIG. 4 is a timing chart for explaining the operation of FIG. This is a timing chart. In the figure, 31 is a playback device, 32 is a field separator, and 33
a and 33b are field memories, 34a and 34b are switchers, 35 is a synchronization control device, 38a and 38b are projectors, 40a and 40b are polarizing filters, 42 is a screen, and 43 is polarized glasses. Patent applicant Mitsubishi Precision Co., Ltd. Figure 1 Figure 2 Figure 20 Figure 4 (H)

Claims (1)

[Claims] A stereoscopic image is produced by reproducing a single video signal formed by alternately corresponding a right video and a left video to one field and the other field in one frame in synchronization with a synchronization control signal. In the stereoscopic image display device, the field separator separates the one field signal and the other field signal from the video signal in synchronization with the synchronization control signal, and outputs two systems of left and right video signals; a field memory provided for each of the two left and right video output systems from the field separator and capable of recording and reading in field units in synchronization with the synchronization control signal; and a field memory provided for each output of the field memory. is,
a switch that operates to insert a readout signal from the field memory into the missing field of the left and right video signals of the field separator in synchronization with the synchronization control signal; A three-dimensional image characterized in that the output from each of these is supplied to two projectors, so that the images are projected through polarizing filters having polarization characteristics orthogonal to each other, and the projected images are observed with polarized glasses. Display device.