JPH0759119A - Pseudo stereoscopic video image display device - Google Patents

Abstract

PURPOSE:To attain pseudo stereoscopic display through signal processing of a usual video signal in use for a compound eye type display device. CONSTITUTION:A video signal 101 is digital-processed by an A/D converter 2 and a motion vector detection circuit 11 detects a motion vector and its output is used to control a delay time of a left signal delay circuit 3 and a right signal delay circuit 4 to provide a time difference between signals respectively displayed on liquid crystal panels 8, 10 thereby providing a stereoscopic video image resulting from parallax to a person wearing a compound eye type display device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pseudo stereoscopic display device for pseudo stereoscopic display of video signals in a binocular display device.

[0002]

2. Description of the Related Art In recent years, a so-called binocular head mount display (hereinafter abbreviated as HMD) has been developed which is mounted on the head and has independent display sections for the left and right eyes. In the binocular HMD, the left and right display parts are independent, so separate video signals with parallax are input to the left and right,
It is possible to present a stereoscopic image to the wearer.

[0003]

However, a binocular HMD
In addition to the above, in order to give separate right and left signals for displaying a stereoscopic image, two cameras are used in the case of real time, and two VTs are used in the case of reproducing the recorded one.
For example, R is used, and two types of video signals are required. Also, the Institute of Television Engineers, Vol. 43, No. 8
pp. As described in 763 to 767, the left and right video signals can be switched for each field and recorded as one system of video signal, and the left and right displays can be switched for each field during playback to provide a stereoscopic display. Although it is said that it was originally recorded as a stereoscopic image,
It was only possible to deal with signals generated as stereoscopic images on a computer or the like.

Further, Japanese Patent Laid-Open No. 53-20347 discloses that
Plays two images with a common video signal,
Although a pseudo-stereoscopic image device that gives a stereoscopic effect by giving a difference in brightness or time is described, a special control signal indicating what kind of stereoscopic effect is given in order to obtain a pseudo-stereoscopic image. Since it is necessary and the control signal must be artificially set in advance, a normal video signal cannot be displayed immediately. Further, there is a drawback that the optical system becomes large in scale because a plurality of concave mirrors and lenticular lenses are used.

Therefore, an object of the present invention is to realize a small pseudo-stereoscopic image display device that can obtain a pseudo-stereoscopic effect even with a normal video signal without performing a special artificial operation. is there.

[0006]

A pseudo-stereoscopic display device of the present invention is a binocular display device having independent display portions for the left and right eyes, and motion vector detection for detecting a motion vector of an input video signal. A circuit and a delay circuit independent for the left eye and the right eye, and having a delay time controlled by the output of the motion vector detection circuit, wherein the video signal passes through the delay circuit to the display unit. It is characterized by being connected.

Further, in a binocular display device having independent display units for the left and right eyes, a motion vector detection circuit for detecting a motion vector of an input video signal and an independent motion vector detection circuit for the left and right eyes are provided. And a multiplication circuit whose coefficient is controlled by the output of the motion vector detection circuit, wherein the video signal passes through the multiplication circuit and is connected to the display unit.

Further, in a binocular display device having independent display sections for the left and right eyes, a motion vector detection circuit for detecting a motion vector of an input video signal and an independent motion vector for the left and right eyes are provided. And an amplification circuit whose amplification factor and DC level are controlled by the output of the motion vector detection circuit, wherein the video signal passes through the amplification circuit and is connected to the display unit.

[0009]

(Embodiment 1) FIG. 1 shows a first embodiment of the present invention.

The video signal 101 is digitized by the A / D converter 1 and input to the detection delay circuit 2 composed of a frame memory. The output of the detection delay circuit 2 is
It is inputted to the left delay circuit 3 and the right delay circuit 4 each composed of a plurality of stages of frame memories, outputted after a predetermined delay time, and inputted to the D / A converters 5 and 6, respectively.
After returning to an analog signal, drive circuits 7 and 8
Video signals are displayed on the liquid crystal panels 9 and 10, respectively.

FIG. 2 shows an example of a binocular HMD incorporating the liquid crystal panels 9 and 10.

Driving circuits 7 and 8 to which one end of a connecting cord 202 is connected are housed in a spectacle-type frame 201. A pair of left and right liquid crystal panels 9 and 10 and a backlight 204 that illuminates the liquid crystal panels 9 and 10 from the back are mounted on the front surface of the frame 201. The liquid crystal panels 9 and 10 and the eyeball 205 of the wearer. Frame between 20
A magnifying lens 203 is provided on the inner surface of 1. The video signals sent from the D / A converters 5 and 6 via the connection cord 202 are decoded by the drive circuits 7 and 8, and the left and right independent displays are performed by the liquid crystal panels 9 and 10.

The liquid crystal panels 9 and 10 have a screen size of 0.7.
It is an ultra-compact full-color or monochrome liquid crystal panel of about 1 to 1.3 inches, which is magnified by the magnifying lens 203 to about 30 inches at a viewing distance of about 1 m so that it can be seen as a virtual image by the operator. . In addition, the liquid crystal panels 9 and 10, the backlight 204, and the magnifying lens 203 are incorporated for each of the left and right eyeballs 205, and when the same video signal is displayed, one natural display screen can be seen by binocular vision. Are arranged as follows.

The input 102 and the output 103 of the detection delay circuit 2 are connected to the motion vector detection circuit 11 of FIG. 1, and by comparing the signals of one frame time difference,
The magnitude and direction of the horizontal movement of the video signal 101 is detected and output.

Here, the motion vector detection circuit 11 is shown in FIG.
An example of the characteristics of The horizontal axis represents the magnitude of movement, and the vertical axis represents the control output. Output 104 and output 1
Reference numeral 05 is symmetric with respect to the horizontal axis, and when it moves to the right, it is output as the output 104, and when it moves to the left, it is output as the output 105 with the opposite polarity. In both cases, the larger the magnitude of the movement, the larger the absolute value, and the saturation characteristic so that the output does not become excessive at the upper limit.

FIG. 4 shows an example of the characteristics of the delay circuits 3 and 4. The horizontal axis represents the motion vector detection circuit 11 or the inversion circuit 1.
The control input is the output from 3, and the vertical axis indicates the delay time. As shown in FIG. 1, the control output of the motion detection circuit 11 is input as it is to the right delay circuit 4 and is input to the left delay circuit 3 through the inversion circuit 13 with its polarity inverted.

Considering a case where there is an object moving to the right and the motion vector detection circuit 11 outputs the output 106 of FIG. 3, the control input of the right delay circuit 4 is 10 in FIG.
6R, and the control input of the left delay circuit 3 is
It is inverted by the inverting circuit 13 and becomes as shown by 106L. Therefore, the difference between the delay times of the delay circuits 3 and 4 is as shown by 107 in FIG.

FIG. 5 is a plan view showing a state where the binocular HMD shown in FIG. 2 is worn. The left eyeball 205L is looking at the liquid crystal panel 9, and the right eyeball 205R is looking at the liquid crystal panel 10. Here, if there is an object that moves to the right, as described above, the delay time on the right becomes longer than the delay time on the left, so that the liquid crystal panel 9 has the object 111 and the liquid crystal panel 1.
At 0, the object 112 is displayed at different positions. Since the stationary portion is displayed at the same position on the liquid crystal panels 9 and 10, it can be seen on the virtual screen 120 shown in FIG. 6 when viewed with both eyes. The object moving to the right is the object 111 on the left eyeball 205L and the right eyeball 205.
Since it is seen as an object 112 in R, it is seen as an object 114 by a binocular vision as if it jumps out to the front. Here, if the delay times of the left delay circuit 3 and the right delay circuit 4 are the same, they are displayed at the same position on the liquid crystal panels 9 and 10 and appear as an object 113 on the virtual screen 120. Therefore, in the present embodiment, it can be seen that the object 113 jumps to the position of the object 114 and the three-dimensional effect is obtained. Furthermore, the faster the movement, the larger the control output of the motion vector detection circuit 11 and the larger the delay time difference, and the larger the pop-out amount.

When the object is moving to the left, the output of the motion vector detecting circuit 11 has the opposite polarity, and the delay time of the left delay circuit 3 becomes longer than the delay time of the right delay circuit 4. It looks like it popped out, just as it did.

When a moving object stands still, the difference in delay time disappears and stereoscopic viewing becomes impossible.
If the output of the motion vector detection circuit 11 is made to have a hysteresis characteristic and the previous output is held until the next motion vector is detected, even if a moving object suddenly stops, a stereoscopic state is obtained. Can be kept.

Further, if the characteristics of the motion detection circuit 11 shown in FIG. 3 are changed, the way of popping out also becomes different. For example, if the outputs have opposite polarities, a moving object can be pulled inward. it can. Also, in FIG. 3, if the same polarity and characteristics are used when moving to the right and to the left,
The left and right movements of an object make it appear to pop out when moving to the right, and retract when moving to the left, and vice versa.

In this embodiment, the binocular HM shown in FIG. 2 is used.
Although it is shown that the blocks after the drive circuits 7 and 8 in FIG. 1 are mounted in D, it is obvious that all the blocks in FIG. 1 can be mounted.

(Second Embodiment) FIG. 7 shows a second embodiment of the present invention.

In FIG. 1 for explaining the first embodiment, the left delay circuit 3 and the right delay circuit 4 are respectively the left multiplication circuit 21.
The right multiplying circuit 22 is replaced with the other, and the other parts denoted by the same reference numerals have the same functions, and the description thereof will be omitted.

The video signal 101 is digitized by the A / D converter 1, passes through the delay circuit 2 for detection, is input to the left multiplication circuit 21 and the right multiplication circuit 22, and is adjusted to a predetermined amplitude. After being input to the A / A converters 5 and 6 and converted back to analog signals, the drive circuits 7 and 8 display video signals on the liquid crystal panels 9 and 10, respectively.

FIG. 8 shows an example of characteristics of the multiplication circuits 21 and 22. The horizontal axis represents the control input from the motion vector detection circuit 11 or the inverting circuit 13, and the vertical axis represents the multiplication coefficient. When the control input is zero, the coefficient is 1, and the input signal from the detection delay circuit 2 is output as it is. When the control input becomes smaller than zero, the coefficient becomes large, and the input signal from the detection delay circuit 2 is amplified and output. Further, when the control input becomes larger than zero, the output is attenuated in reverse. The output of the motion detection circuit 11 is directly input to the right multiplication circuit 22, but the output of the left multiplication circuit 2
The polarity is inverted and input to 1 through the inversion circuit 13.

Considering that there is an object moving to the right and the motion vector detection circuit 11 outputs the output 121 of FIG. 3, the control input of the right multiplication circuit 22 is 1 in FIG.
21R, the control input of the left multiplication circuit 21 is inverted by the inversion circuit 13, and becomes as shown by 121L. Therefore, the difference between the output coefficients of the multiplication circuits 21 and 22 is as shown by 122 in FIG. 8, and the moving object is displayed dark on the liquid crystal panel 10 of the right eye and bright on the liquid crystal panel 9 of the left eye. Is displayed.

FIG. 9 is a plan view showing a state where the binocular HMD shown in FIG. 2 is worn. The left eyeball 205L is looking at the liquid crystal panel 9, and the right eyeball 205R is looking at the liquid crystal panel 10. Here, if there is an object that moves to the right, the brightness on the right becomes darker than the brightness on the left, as described above.
The object 123 is displayed on the liquid crystal panel 9 and the object 124 is displayed on the liquid crystal panel 10 at the same position.

Here, as is known as Pulfrich's principle, human visual action has a property that the time until an object is seen changes depending on the brightness.

Since the stationary portion is displayed with the same brightness on the liquid crystal panels 9 and 10, it can be seen on the virtual screen 120 shown in FIG. 10 when viewed with both eyes. However, the object moving to the right appears as an object 123 to the left eyeball 205L, but the object 124 is still visible to the right eyeball 205R because the object 124 is dark. As the object 126, the object 126 is projected to the front, and a three-dimensional effect can be obtained. Furthermore, the faster the movement,
The control output of the motion vector detection circuit 11 becomes large, and as a result, the difference in brightness becomes large, so that the pop-out amount becomes large.

When the object is moving to the left, since the output of the motion vector detecting circuit 11 has the opposite polarity, the coefficient of the left multiplying circuit 21 becomes smaller than the coefficient of the right multiplying circuit 22, and the liquid crystal panel for the right eye. Since the object on the liquid crystal panel 10 on the left side of 9 is displayed dark, it appears to pop out in the same manner as described above.

When a moving object stands still, the difference in brightness disappears and stereoscopic viewing becomes impossible.
If the output of the motion vector detection circuit 11 is made to have a hysteresis characteristic and the previous output is held until the next motion vector is detected, even if a moving object suddenly stops, a stereoscopic state is obtained. Can be kept.

Further, if the characteristic of the motion detecting circuit 11 shown in FIG. 3 is changed, the way of popping out also becomes different. For example, if the output has the opposite polarity, the moving object can be retracted to the back. . Also, in FIG. 3, if the same polarity and characteristics are used when moving to the right and to the left, the left and right movements of the object make it appear to pop out when moving to the right and to appear to retract when moving to the left. It can be turned on and vice versa.

It is obvious that a storage element such as a RAM or ROM in which a look-up table is written in advance can be used instead of the multiplication circuit described in this embodiment.

(Embodiment 3) FIG. 11 shows a third embodiment of the present invention. The same reference numerals as those in FIG. 1 for explaining the first embodiment have the same functions, and the description thereof will be omitted.

The video signal 101 is digitized by the A / D converter 1 and input to the detection delay circuit 2. Further, the video signal 101 includes the left amplifier circuit 31 and the right amplifier circuit 3.
It is also input to 2 and adjusted to a predetermined amplitude and DC level, and then the drive circuits 7 and 8 display video signals on the liquid crystal panels 9 and 10, respectively.

FIG. 12 shows an example of characteristics of the amplifier circuits 31 and 32. The horizontal axis represents the control input from the motion vector detection circuit 11 or the inverting circuit 13, and the vertical axis represents the amplification factor and the DC level. When the control input is zero, the coefficient is 1, and the input video signal 101 is output as it is.
Further, when the control input becomes smaller than zero, the amplification factor and the DC level increase, and the input video signal 101 is amplified and the black level also rises and is output. Further, when the control input becomes larger than zero, it is attenuated to the contrary, and the black level is also lowered and output. The output of the motion detection circuit 11 is the right amplification circuit 3
2 is input as it is, but the polarity is inverted and input to the left amplification circuit 31 through the inversion circuit 13.

Considering the case where there is an object moving to the right and the motion vector detection circuit 11 outputs the output 131 of FIG. 3, the control input of the right amplification circuit 32 is shown by 131R of FIG. Then, the control input of the left amplifier circuit 31 is inverted by the inversion circuit 13 and becomes as shown by 131L. Therefore, the difference between the amplification factor and the DC level of the amplifier circuits 31 and 32 is as shown by 132 in FIG. 12, and the moving object is displayed dark on the liquid crystal panel 10 of the right eye,
It is displayed brightly on the liquid crystal panel 9 of the left eye.

In this way, a stereoscopic effect can be obtained by the same principle as described in the second embodiment.

In this embodiment, the brightness is controlled by controlling the amplitude and DC level of the signal, but it is clear that the same effect can be obtained by controlling only one of them.

[0041]

As described above, according to the present invention,
It is possible to realize a small pseudo-stereoscopic video display device that can obtain a pseudo-stereoscopic effect with a normal video signal without using a video signal specially prepared for stereoscopic use or performing a special artificial operation. .

[Brief description of drawings]

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

FIG. 2 is a diagram showing an example of a binocular HMD of the present invention.

FIG. 3 is a diagram showing an example of characteristics of a motion vector detection circuit of the present invention.

FIG. 4 is a diagram showing an example of characteristics of a delay circuit of the present invention.

FIG. 5 is a plan view showing a mounting example of the binocular HMD of the present invention.

FIG. 6 is a diagram illustrating stereoscopic vision according to the present invention.

FIG. 7 is a block diagram showing a second embodiment of the present invention.

FIG. 8 is a diagram showing an example of characteristics of the multiplication circuit of the present invention.

FIG. 9 is a plan view showing a mounting example of the binocular HMD of the present invention.

FIG. 10 is a diagram illustrating stereoscopic vision according to the present invention.

FIG. 11 is a block diagram showing a third embodiment of the present invention.

FIG. 12 is a diagram showing an example of characteristics of the amplifier circuit of the present invention.

[Explanation of symbols]

 1 A / D converter 2 Detection delay circuit 3 Left delay circuit 4 Right delay circuit 5 D / A converter 6 D / A converter 7 Drive circuit 8 Drive circuit 9 Liquid crystal panel 10 Liquid crystal panel 11 Motion vector detection circuit 13 Inversion circuit 21 Left Multiplying circuit 22 Right multiplying circuit 31 Left amplifying circuit 32 Right amplifying circuit 101 Video signal 102 Input 103 Output 104 Control characteristic 105 Control characteristic 106 Control output 107 Delay time difference 111 Object 112 Object 113 Object 114 Object 120 Virtual screen 121 Control output 122 Multiplying coefficient Difference 123 Object 124 Object 125 Object 126 Object 131 Control Output 132 Gain, Black Level Difference 201 Frame 202 Connection Code 203 Magnifying Lens 204 Backlight 205 Eyeball

Claims (3)

[Claims] 1. A binocular display device having independent display units for the left and right eyes, and a motion vector detection circuit for detecting a motion vector of an input video signal, and an independent motion vector detection circuit for the left and right eyes. And a delay circuit whose delay time is controlled by the output of the motion vector detection circuit, wherein the video signal passes through the delay circuit and is connected to the display section. . 2. A binocular display device having independent display units for the left and right eyes, and a motion vector detection circuit for detecting a motion vector of an input video signal, and an independent motion vector detection circuit for the left and right eyes. And a multiplication circuit whose coefficient is controlled by the output of the motion vector detection circuit, wherein the video signal passes through the multiplication circuit and is connected to the display unit. 3. A binocular display device having independent display units for the left and right eyes, and a motion vector detection circuit for detecting a motion vector of an input video signal, and an independent motion vector detection circuit for the left and right eyes. And a amplification circuit whose amplification factor and DC level are controlled by the output of the motion vector detection circuit, wherein the video signal passes through the amplification circuit and is connected to the display section. Video display device.