JPH07212799A - Stereoscopic video display device - Google Patents

Abstract

PURPOSE:To obtain a stereoscopic video display device with a simple configuration using one set of TV camera or VTR. CONSTITUTION:A video signal from a TV camera 20 picking up a moving object 28 in a prescribed direction is converted into a digital video signal by an A/D converter 21 and stored sequentially to plural frame memories 22-1-22-n for each frame. A switch 23 reads the digital video signal from a frame memory to obtain a required delay DELTAt and a D/A converter 24 is used to convert the digital signal into an analog video signal. The analog video signal is given to a display device 25 together with the video signal from the TV camera 20, in which a stereoscopic image can be seen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device, and more particularly to a device having a simple structure capable of displaying a stereoscopic image by using one TV camera and / or one VTR.

[0002]

2. Description of the Related Art A well-known conventional three-dimensional image display device is a twin-lens type three-dimensional television as shown in FIG. In the figure, 1 and 2 are left and right TV cameras respectively, 3 and 4 are VTRs corresponding to them, 5 and 6 are cathode ray tubes for displaying reproduced video signals from the VTRs 3 and 4, 7 is a half mirror, and 8 is a polarizing filter. They are glasses. In this twin-lens type three-dimensional television, the images taken by the two left and right TV cameras 1 and 2 are displayed so as to enter the left and right eyes, respectively, but since the two TV cameras and the VTR are used, the configuration is large. And it is complicated and expensive. Therefore, a stereoscopic image display device having a simple structure as shown in FIG. 7 using one TV camera and a VTR has also been proposed. In the figure, 9a is a delay device, and 9
b is a switch. The principle of stereoscopic image display by this device is as follows.

Now, in FIG. 7, it is assumed that the subject 10 rests slowly on the turntable 11 from left to right. This subject 10 is imaged by the TV camera 2 and VT
Record in R4. The reproduced image of the VTR 4 is the same as that seen when moving from the right to the left in front of the stationary subject 10. The reproduced image at time t is
Since the image is seen from the right side from time t + Δt after t, if the reproduction signal is added to the display 5 for the left eye as it is, and it is delayed by Δt and added to the display 6 for the right eye. , (Rotational angular velocity ω of the turntable 11) × (from the rotation center of the turntable 11 to the subject 10
A parallax of (distance r) × (delay time Δt) is obtained, and a stereoscopic moving image can be viewed. However, according to this method,
The direction of the relative movement between the subject 10 and the TV camera 1 is constant, and the correspondence between this direction and the left and right of the display should not be mistaken. A reproduction image and its delayed image are added) is a condition for obtaining a stereoscopic effect.

FIG. 8 is a further simplification of the stereoscopic display unit in FIG. 7, and shows a TV receiver 12 and special glasses 1.
3 is used. Human vision has a characteristic that recognition is delayed when the brightness of an image is low, and the method of FIG. 8 uses this delay to create a time difference Δt between left and right images. The left eye portion 13a of the spectacles 13 is made of transparent glass, and the right eye portion 13b is made of an ND filter. When this spectacle is put on, Δt = 5 when the transmittance of the ND filter 13b is 20%.
The transmittance of the ND filter must be 5% or less in order to obtain Δt = 10 ms.

[0005]

Now, as shown in FIG. 9, an object 10 having a radius r is mounted on the turntable 11 and rotated once in T seconds (rotational angular velocity ω = 2π / T). Suppose this is viewed from a position D (m) away. FIG. 9 shows the positional relationship when a reproduced image is displayed at the same size. In order to generate a natural stereoscopic effect in this state, the left and right parallax rωΔt must satisfy the following relationship.

Binocular distance d / visual distance D = left / right parallax rωΔt / radius r (1) From this, the time difference Δt between the left and right signals is Δt = d / ωD = Td / 2πD (2). Therefore, if d = 63 mm, T = 10 seconds, and D = 1 m, then Δt = 0.1 seconds. This value is a time that cannot be realized by utilizing the delay of the eye recognition due to the difference in the brightness of the image as shown in FIG. 8, and the method of FIG. 8 is not practical.

Further, since an electric signal has a propagation velocity of 300,000 km / s, an analog signal (VT
It is difficult to realize a delay of 0.1 seconds with the R output), and there is also an analog delay line, but without degrading a wideband (4.5 MHz) signal like a television signal. It is very difficult to realize a delay line that can delay 0.1 seconds.

An object of the present invention is to realize the above-described stereoscopic image display device with a simpler, cheaper and more practical structure.

[0009]

In order to achieve the above object, a stereoscopic image display apparatus according to the first aspect of the present invention digitally outputs a video signal output unit of a subject moving in a fixed direction and a video signal from the unit. An A / D conversion means for converting the video signal, a memory means for storing the digital video signal for each frame, a D / A conversion means for converting the digital video signal from the memory means into an analog video signal, It is a gist to have a display means for inputting and displaying a video signal and the analog video signal.

In the device of the first invention, the memory means comprises a plurality of frame memories connected in series, and the plurality of frame memories are shifted by one frame for each frame from the preceding frame memory. There may be provided a selection means for storing the digital video signal and for selecting the output of each frame memory and inputting it to the D / A conversion means.

In the apparatus of the first invention, the memory means comprises a predetermined large-capacity storage device, and the digital video signal from the A / D conversion means is stored in the large-capacity storage device by the predetermined control device for each frame. It may be configured to be stored in the memory and to be read from the mass storage device at every predetermined frame.

In the apparatus of the first invention, the memory means comprises a FIFO memory, and the digital video signal from the A / D conversion means is stored in the FIFO memory for each frame and at a predetermined timing from the FIFO memory. It may be configured to read by. Further, in each of the above devices, the video signal output means may be one TV camera or one VTR.

Further, the stereoscopic image display device of the second invention is 1
A VTR having at least two reproducing heads for reproducing a video signal of a subject moving in a certain direction by one TV camera, and a display unit for inputting and displaying the reproduced video signal from the VTR. The gist is that the two reproducing heads are provided at positions separated by a predetermined frame.

[0014]

In the apparatus according to the first aspect of the present invention, the video signal of the object moving in a fixed direction is A / D converted, and the obtained digital video signal is stored in each frame. The digital video signal read from the memory is D / A converted and stereoscopically displayed together with the video signal.

Further, in the apparatus of the second invention, each video signal read from the VTR having two reproducing heads is stereoscopically displayed.

[0016]

Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a first embodiment of a stereoscopic image display device according to the first invention, in which 20 is a TV camera, 21 is an A / D converter, and 2
Reference numeral 2 denotes a memory, which is composed of a plurality of frame memories 22-1 to 22-n connected in series. Reference numeral 23 is a delay amount changeover switch, 24 is a D / A converter, and 25 is a display device. The display device 25 is, for example, a left and right cathode ray tube (CRT) 2
5L, 25R and half mirror 25H, and an observer 26 wears glasses 27 composed of a polarization filter.

Now, assuming that the subject 28 is traveling in a certain direction as indicated by an arrow, this is photographed by the TV camera 20, and the video signal from the TV camera 20 is converted into a digital video signal by the A / D converter 21. And is stored in the memory 22 for each frame. In this case, the digital video signal for one frame is first stored in the frame memory 22.
When the digital video signal stored in the frame memory 22-1 is stored in the frame memory 22-1, the digital video signal stored in the frame memory 22-1 is stored in the frame memory 22-1. 22
-2, and similarly, a predetermined number of each frame memory stores a digital video signal which is shifted by one frame from the previous frame memory.

The switch 23 is connected to the frame memory 22-i from which the required delay amount Δt is obtained, and the digital video signal read from the frame memory 22-i is converted into an analog video signal by the D / A converter 24, and the TV is set. Along with the video signal from the camera 20, the cathode ray tubes 2 on the left and right of the display device 25, respectively.
In addition to 5L and 25R, the image of the subject 28 is stereoscopically displayed and observed. According to this embodiment, the stereoscopic effect of the displayed image can be adjusted by appropriately selecting the delay amount Δt ′ by the switch 23.

The condition for stereoscopic display in the apparatus of FIG. 1 is that the direction of relative movement between the subject 28 and the TV camera 20 is constant, and the correspondence between the two video signals and the left and right display is constant. Therefore, in order to cope with the case where the above directions are reversed, it is preferable to provide the switch 29 and switch the switch 29 according to the above direction.

FIG. 2 shows a second embodiment of the first invention, in which a large-capacity storage means, for example, a hard disk device 30 is used in place of the frame memory to write / read the digital video signal for each frame. It is designed to be performed by the control device 31. Since the hard disk device has a larger memory capacity than the frame memory, the delay amount (Δt)
Therefore, it is possible to set a wide variety of changes in the delay amount when, for example, one of the subject side and the camera side moves to take an image.

FIG. 3 shows a third embodiment of the first invention, in which a FIFO (First In First Ou) is used instead of the frame memory.
t) The memory 32 is used. The digital video signal is stored in the FIFO memory 32 for each frame, and is stored in the memory for a predetermined period. After this predetermined period, new data for each frame is input as the data stored in the memory. Then, the first stored data is output. Therefore, the predetermined period corresponds to the delay amount. The delay amount Δt can be controlled by the output timing control means 33 connected to the FIFO memory 32.

FIG. 4 shows an embodiment of the second invention, in which a VTR 34 is used in place of the frame memory. In this case, an A / D converter, a D / A converter, a changeover switch, etc. are unnecessary. is there. The VTR 34 is, for example, as shown in FIG.
As shown in (b), it has two reproducing heads 34a and 34b, and the reproducing positions of the respective reproducing heads are provided at positions delayed by a predetermined frame in advance. In this case, if the head cannot be set at a position where a predetermined delay amount can be obtained, additional delay means or memory means is used. When the VTR 34 is reproduced, the reproducing head 34a,
Since the video signal from 34b and the video signal delayed by a predetermined frame are output, a stereoscopic video can be displayed by adding the video signal to the display device 25. In each of the above-mentioned embodiments, a VTR in which a video signal photographed by the camera is recorded can be used in place of the TV camera 20, and the display device 25 has any configuration as long as it can display three-dimensionally. But it's okay.

[0023]

As described above, according to the present invention, 1
A stereoscopic image can be displayed by a single TV camera or VTR, and an inexpensive stereoscopic image display device with a simple configuration can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the first invention.

FIG. 2 is a block diagram showing a second embodiment of the first invention.

FIG. 3 is a block diagram showing a third embodiment of the first invention.

FIG. 4 is a block diagram showing an embodiment of the second invention.

5 is a schematic diagram showing a configuration example of a VTR in the embodiment of FIG.

FIG. 6 is a schematic view showing a conventional twin-lens stereoscopic television.

FIG. 7 is a schematic view showing a conventional stereoscopic television.

FIG. 8 is a schematic view showing another conventional stereoscopic television.

FIG. 9 is an explanatory view of the principle for displaying a stereoscopic image by using one TV camera and VTR.

[Explanation of symbols]

 20 TV camera 21 A / D converter 22 Memory 23 Switch 24 D / A converter 25 Display device

Claims (7)

[Claims] 1. A video signal output means for a subject, an A / D conversion means for converting the video signal from the means into a digital video signal, a memory means for storing the digital video signal for each frame, and the memory. A stereoscopic video display device comprising: a D / A conversion means for converting a digital video signal from the means into an analog video signal; and a display means for inputting and displaying the video signal and the analog video signal. . 2. The memory means comprises a plurality of frame memories connected in series, the plurality of frame memories being one.
For each frame, a digital video signal which is offset by one frame from the previous frame memory is stored, and a selection means for selecting the output of each frame memory and inputting it to the D / A conversion means is provided. Claim 1 characterized by the above.
The stereoscopic image display device described in. 3. The memory means comprises a predetermined large-capacity storage device, and a predetermined control device stores the digital video signal from the A / D conversion means in the large-capacity storage device for each frame. The three-dimensional image display device according to claim 1, wherein the three-dimensional image display device is configured to read from the capacity storage device for each predetermined frame. 4. The memory means comprises a FIFO memory, and stores the digital video signal from the A / D conversion means in the FIFO memory for each frame.
The stereoscopic image display apparatus according to claim 1, wherein the stereoscopic image display apparatus is configured to read from the IFO memory at a predetermined timing. 5. The stereoscopic video display device according to claim 1, wherein the video signal output means includes at least one TV camera and relatively moves in a predetermined direction between the subject and the TV camera. 6. The stereoscopic video display device according to claim 1, wherein the video signal output means is one VTR for recording and reproducing a video signal from one TV camera. 7. A VTR having at least two reproducing heads for reproducing a video signal of a subject moving in a certain direction by one TV camera, and a reproduction video signal from the VTR is inputted and displayed. And a display means for performing the same, and the two reproducing heads are provided at positions separated by a predetermined frame.