JPH11127456A - Device and method for displaying video - Google Patents

Abstract

PROBLEM TO BE SOLVED: To represent a stereoscopic effect even in a two-dimensional video signal by combining the entire or a part of factors that acquire a stereoscopic effect and using them. SOLUTION: A front and rear feeling and depth feeling circuit 14 to which a luminance signal Y and color-difference signals R-Y and B-Y are supplied supplies the signal Y which is undergone front and rear feeling and depth feeling as a luminance signal YL to a brilliance feeling contrast emphasis circuit 15L and a color emphasis circuit 17L of a video signal path for a left eye. The circuit 15L supplies a signal which is performed contrast emphasis to a V aperture control coring sharpness circuit 16L. The signal YL performs coring sharpness which gives sharpness only to an edge which has V aperture control that lifts a frequency characteristic which is more than intermediate and low pass in a change point in the vertical direction of an image and a frequency component whose amplitude is large and high. The circuit 17L performs color emphasis which emphasizes the color contrast of colors excepts a flesh color to the signals R-Y and B-Y.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention proposes a video display method and a video display device capable of enhancing a stereoscopic effect in a video signal.

[0002]

2. Description of the Related Art Among the three-dimensional display methods, the most feasible one is a three-dimensional display method using left and right parallax information. In this method, two cameras are used at the time of shooting, and a left-eye signal and a right-eye signal are taken. At the time of reception, this is reproduced so as to be reflected on each eye.

FIG. 36 shows the principle of operation of stereoscopic vision using binocular (left and right) parallax. On the display surface 1, the left eye image 3L
And a right-eye image 3R shifted horizontally. Normally, the focus of the left and right eyes (2L, 2R) (the point where the left and right lines of sight intersect and is called the point of convergence) and the focus of each eye (2L, 2R) (eye adjustment with a single eye) Matching point) is the same place. Specifically, CR
In T and the like, the CRT surface is a place where the convergence and adjustment are matched, and in a projector and the like, the screen is a place where the convergence and adjustment are matched.

FIG. 36A shows a case of cross congestion. In this case, the video 3R shifted to the left is projected to the right eye 2R, and the video 3L shifted to the right is projected to the left eye 2L. At this time, the image is fused in the head as if there is an object at the position where the left and right eyes are congested. This virtual image 4 </ b> A appears to jump out of the display surface 1. On the other hand, FIG. 36B shows a case of parallel congestion (non-crossing congestion). In this case, the image 3L shifted to the left is moved to the left eye 2
L to the right eye 2
Make it appear in R. In the parallel convergence, the virtual image 4B is fused deeper than the display surface 1.

The use of the principle of the left and right parallax to obtain a three-dimensional effect even in a normal two-dimensional image is to enhance the three-dimensional effect using the Pulfrich effect. The Pulfrich effect (or Pulfrich's law) means that an object that reciprocates right and left in a vertical plane in front of the eye is viewed with both eyes with a filter (ND filter) that reduces light in one eye. The object appears to move in an elliptical trajectory with depth, such as in front of and behind this plane. " For example, as shown in FIG. 37, when the pendulum reciprocating left and right in the plane 6 is seen with the ND filter 5 attached to the left eye 2L, when the pendulum moves from right to left, the plane 6 When the pendulum moves further forward and moves from left to right, on the other hand, it is observed that the pendulum passes behind the surface 6 and the trajectory of the pendulum forms an elliptical trajectory 7.

[0006] The Pulfrich effect occurs because the left eye 2L whose light is weakened has a time lag when transmitting a signal from the eye to the cerebrum, as compared with the right eye 2R which does not weaken the light. That is, in the example of FIG. 37, when the pendulum moves from right to left and is at the position of q, the signal of the left eye 2L is delayed, and at this moment, the pendulum moves to the left as if it were at the position of p. The eye 2L recognizes. In this way, binocular parallax is generated, and it is felt as if the pendulum is at the N position due to the cross convergence shown in FIG. 36A described above. Conversely, when the pendulum moves from left to right and is at position q, the left eye 2L recognizes the pendulum as if it were at position r. Due to this binocular parallax, it is felt as if the pendulum is at the position of F due to the parallel convergence shown in FIG. 36B.

[0007]

As described above, the ordinary 2
As a method of enhancing the three-dimensional effect of a two-dimensional image, there has been a method using the effect of Pulfrich.

However, the drawbacks of the Pulfrich effect are that only moving objects can be seen as three-dimensional, and that the three-dimensional effect is affected by the speed and direction of movement, that is, the sense of depth changes with the speed of movement. There is a problem that the front and the back are uniquely determined by the point and the direction of the movement.

In other words, the Pulfrich effect has a problem that only the object moving in a specific direction increases the three-dimensional effect (depth effect), and the effect is not exhibited in a still image.

Therefore, an object of the present invention is to provide both eyes (left and right)
It is an object of the present invention to provide a video display method and a video display device that can enhance a stereoscopic effect (a sense of front and rear) in a normal two-dimensional video signal in addition to a three-dimensional video signal in a stereoscopic display system using a parallax effect.

[0011]

According to a first aspect of the present invention, there is provided a video display device for receiving a video signal and displaying the video on a display device, wherein the video signal uses edge information or focus information of the video signal. The image position is moved in the horizontal direction according to the amplitude level and the frequency level of the change, and a sense of anterior / posterior emphasis that adds left-right parallax, and depth that makes the central fusion plane deeper than the display surface due to parallel convergence Glossy enhancement means, glossy enhancement means for detecting the glossy part of the image and enhancing the contrast of one eye and / or both eyes in the glossy area, and coring for giving sharpness only to edges having large amplitude and high frequency components Sharpness means, vertical aperture control means for raising the frequency characteristics above the mid-low range at the vertical change point of the image, and skin color as a memory color A video display device characterized by detecting and enhancing color contrast of colors other than flesh color, and using two or more of these means to enhance a stereoscopic effect. .

According to a ninth aspect of the present invention, in a video display method for receiving a video signal and displaying a video on a display device, the edge level or the focus information of the video signal is used to determine the amplitude level of the change in the video signal. In accordance with the frequency level, the position of the image is moved in the horizontal direction, and a left-right parallax is added, and a depth sensation emphasizing method in which the central fusion plane is made deeper than the display surface by parallel convergence. A glossy portion that detects a glossy portion of the image and enhances the contrast of one eye and / or both eyes in the glossy portion; a coring sharpness method that gives sharpness only to edges having large amplitude and high frequency components; A vertical aperture control method that raises the frequency characteristics above the mid-low range at the point of change in the vertical direction. And emphasizing the color contrast color enhancement methods color, using two or more from among these methods, a video display method is characterized in that so as to emphasize the stereoscopic effect.

According to the present invention, seven factors of stereoscopic vision of front-back feeling, depth feeling, glossiness, contrast emphasis, vertical aperture control (hereinafter abbreviated as V aperture control), coring sharpness, and color emphasis are applied. Even in the case of a normal two-dimensional video signal, various factors work effectively, and a video expression with a more three-dimensional effect can be realized. In the case of an image shot by a normal camera, the sense of front and rear and coring sharpness effectively work for stereoscopic vision by providing left and right parallax at the boundary of the image and enhancing its sharpness. In addition, an image such as a landscape image has pan focus, but since it has a perspective, parallel congestion works effectively. In fruits and fresh images, color enhancement, glossiness, and contrast enhancement work effectively to enhance the contrast and glossiness of the subject. Also, in computer graphic (hereinafter abbreviated as CG) video, color enhancement and V-apache effectively enhance the shadows of the CG and enhance the stereoscopic effect. In this way, these effects can be produced without being affected by stationary / moving.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. This FIG. 1 shows a sense of depth, a sense of depth,
The present invention is applied to a projection type display using two projectors for displaying left and right images, respectively, as factors for enhancing the three-dimensional effect of glossiness, contrast enhancement, V-apercom, coring sharpness, and color enhancement. This is an example.

In FIG. 1, a two-dimensional video signal (composite color video signal) is supplied to an input terminal 11. For example, a television broadcast signal received by an antenna and a tuner is an example of a two-dimensional video signal. In addition, analog satellite broadcasting, digital broadcasting,
A two-dimensional video signal may be received from a video signal reproducing device using a medium such as a disk or a tape.

An input color video signal is supplied to a Y / C separation circuit 12.
And a luminance signal Y and a chrominance signal (carrier chrominance signal) C
Are separated. The color signal C is supplied to the color demodulation circuit 13,
Color demodulation is performed. Two color difference signals (RY and BY) from the color demodulation circuit 13 are generated. The luminance signal Y and the color difference signals RY and BY are supplied to the front / rear sense / depth sense circuit 14. Before and after feeling and depth feeling circuit 14, as a luminance signal Y is a luminance signal Y _L of rear feeling and depth feeling to be described later has been performed, gloss contrast of the video signal path for the left eye enhancement circuit 15L and color enhancement It is supplied to the circuit 17L. In the gloss / contrast enhancement circuit 15L, a signal subjected to gloss and contrast enhancement as described later is supplied to a V aperture control / coring sharpness circuit 16L.

The luminance signal Y _L supplied to the V aperture control / coring sharpness circuit 16L includes a V aperture control which raises the frequency characteristics of the middle and low frequencies or higher at the vertical change point of the image, as will be described later, and a frequency having a large amplitude. Coring sharpness, which gives sharpness only to edges having components, is applied and supplied to the matrix circuit 18L. Further, the color difference signals RY and BY from the front / rear sense / depth sense circuit 14 are supplied to the color enhancement circuit 17L in the video signal path for the left eye. In the color emphasizing circuit 17L, the color difference signals RY and BY are subjected to color emphasis to enhance the color contrast of colors other than the flesh color, as described later, as described later. The color difference signals RY and BY subjected to color emphasis are supplied to a matrix circuit 18.
L. Similarly to the left-eye video signal path, the right-eye video signal path is provided with a gloss / contrast emphasis circuit 15R, a V-apercom / coring sharpness circuit 16R, and a color emphasis circuit 17R.

In the description of this specification, L and R
Are used to indicate the correspondence between the left-eye image and the right-eye image. For simplicity, audio signal processing is omitted.

The three primary color signals R, G and B are formed by the matrix circuits 18L and 18R. Matrix circuit 1
The three primary color signals R, G, and B formed by 8L
It is supplied to the CRT drive circuit 20L via 9L.
The three primary color signals R, G,
B is a CRT drive circuit 20 via a preamplifier 19R.
Supplied to R.

The CRTs 21L and 21R for projection are driven by the CRT drive circuits 20L and 20R, respectively. These CRT drive circuits and CR
T forms two projectors. As a projector, three CRs driven by each primary color signal
It is also possible to use T or a liquid crystal instead of a CRT. Further, the projector can use any of a reflection type and a transmission type configuration.

A left-eye image and a right-eye image generated by the projector are superimposed and displayed at the same position on the screen 23. At the time of this superimposition, the position of the image is not shifted. The left-eye image projected by the CRT 21L is assumed to have passed through the horizontal polarization filter 22L. On the other hand, the right-eye image projected by the CRT 21R is assumed to have passed through the vertical polarization filter 22R.

By using the glasses 24 having the horizontal polarization filter 25L for the left eye and the vertical polarization filter 25R for the right eye, it is possible to separate and view the images projected on the screen 23 by the CRTs 21L and 21R. It becomes possible. Not only horizontal / vertical polarizing filters,
A filter having a different polarization direction, for example, a right-handed / left-handed polarization filter may be used.

In the first embodiment, the luminance signal Y and the two chrominance signals RY and BY separated by Y / C and chroma-decoded correspond to the front-rear sensation and depth sensation circuit 14 shown in FIG. And input to the block of parallel congestion. Here, the right-eye signal is delayed by a fixed value more than the left-eye signal. As a result, the right-eye signal is shifted to the right on the display surface more than the left-eye signal, and the image is fused deeper than the display surface based on the principle of left-right parallax shown in FIG. Becomes

Next, FIG. 2 shows a second embodiment in which a field double speed CRT is used. A two-dimensional video signal (composite color video signal) is supplied to an input terminal 11. An input color video signal is supplied to a Y / C separation circuit 12, where a luminance signal Y and a chrominance signal (carrier color signal) C are separated. The color signal C is supplied to the color demodulation circuit 13 and color demodulated. The two color difference signals (R
-Y and BY) occur. The luminance signal Y and the chrominance signals RY and BY are converted by the field doubling circuit 26.
Supplied to

As will be described later, the field doubling circuit 26 performs a field double speed luminance signal 2Y and a color difference signal 2Y.
(RY), 2 (BY) and a pulse signal 2V are output. Luminance signal 2Y, color difference signal 2 (RY), 2 (B
−Y) is supplied to the front / rear sense / depth sense circuit 14. In the front / rear feeling / depth feeling circuit 14, the luminance signal Y to which the front / rear feeling and the depth feeling are applied is defined as the luminance signal Y as
The signal is supplied to the contrast enhancement circuit 15. In the gloss / contrast enhancement circuit 15, the signal subjected to the gloss and contrast enhancement is supplied to a V aperture control / coring sharpness circuit 16.

The luminance signal Y supplied to the V aperture control and coring sharpness circuit 16 is subjected to V aperture control and coring sharpness as described later, and is supplied to the matrix circuit 18. The color difference signals RY and BY from the front / rear sense / depth sense circuit 14 are supplied to the color emphasizing circuit 17. The color emphasizing circuit 17 performs color emphasis on the color difference signals RY and BY. Color difference signals RY and BY subjected to color emphasis
Are supplied to the matrix circuit 18. The three primary color signals R, G, and B are formed by the matrix circuit 18. The three primary color signals R, G and B are supplied to the preamplifier & drive circuit 27.
Then, predetermined processing such as γ correction is performed, and the CRT
86 is driven to display an image on the CRT 28.

The front / rear sense / depth sense circuit 14 shown in FIG.
The gloss / contrast enhancement circuit 15 corresponds to the pulse signal 2V generated by the field doubling circuit 26. That is, the drive is changed according to the fields corresponding to the left and right eyes after the double speed.

The first embodiment described above is an example of time-axis modulation using two projectors, but the second embodiment is an example using a field double-speed CRT. In this case, the first field that has been field-doubled is used as a left-eye video signal, and the second field that is field-doubled is used as a right-eye video signal. The difference from the case where the two projectors are used is that the delay line for time axis modulation is one for each of the doubled speed fields for the left eye signal and the right eye signal.
Only the system is needed. However, since it is necessary to change the polarity of the modulation for the left eye and the right eye, it is necessary to reverse the polarity of the high frequency component for modulating the time axis for each doubled field. Further, when the delay time of only the right eye video signal is changed by setting the left eye video signal to a fixed delay time, the time axis modulation may be performed only for the right eye field. Conversely, the delay time of the right eye may be kept constant, and only the field of the left eye may be time-axis modulated.

The processing by the field doubling circuit 26 will be described with reference to FIG. In FIG. 3, the color difference signal is omitted for simplicity. Field period Tv (NT
When an input luminance signal Y (FIG. 3A) of 1/60 second in the case of the SC system and 1/50 second in the case of the CCIR system is supplied, an output luminance signal (having a field period of 1/2 · Tv) is supplied. FIG. 3B) is formed. In other words, the field A of the input luminance signal is twice the field frequency of the field A.
A pair of 1 and A2 is formed, and a pair of fields B1 and B2 having twice the field frequency from the field B is formed. FIG. 3C shows a pulse signal 2V whose level is inverted every double speed field. Such doubling processing can be performed by a configuration in which the video signal is digitized and the time axis is compressed by a digital memory.

As described above, the first field (A) in which the pulse signal 2V synchronized with the double-speed field is at a high level.
, 1) are used as left-eye video signals, and the low-level second fields (A2, B2,...)
・) Is used as the right eye video signal. The field double speed circuit 26 outputs a field double speed luminance signal 2Y and a pulse signal 2V.

The processed luminance signal 2Y and color difference signal from the field doubling circuit 26 are supplied to the matrix circuit 18. The matrix circuit 18 forms the field double speed three primary color signals 2R, 2G, and 2B. The three primary color signals are supplied to the CRT 28 via a gloss enhancement circuit 84 and a preamplifier & drive circuit 85. CRT2
Reference numeral 8 denotes a configuration capable of displaying a field double speed color video signal. That is, the vertical scanning frequency and the horizontal scanning frequency of the CRT 28 are set to be twice those frequencies when displaying a video signal that is not double speed.

The image displayed on the CRT 28 includes a front / rear sense / depth sense circuit 14, a glossiness / contrast enhancement circuit 15, a V aperture control / coring sharpness circuit 16,
The image is three-dimensionally emphasized by the color emphasizing circuit 17, so that a three-dimensional effect is produced even when viewed without wearing glasses. Furthermore, by wearing glasses with shutters provided on the left and right, the stereoscopic effect is enhanced. As the shutter provided to the glasses, a shutter that can be electrically turned on / off, for example, a liquid crystal shutter can be used. The shutter is turned on / off by a pulse signal synchronized with the pulse signal 2V from the field doubling circuit 26.
It is controlled to operate. As an example, the pulse signal 2V is received from the receiver side by infrared transmission, and when the pulse signal 2V is at a high level, the left shutter is turned off.
N, the right shutter is turned off, and the ON / OFF state is inverted during the period when the pulse signal 2V is at the low level. As a result, the left-eye image and the right-eye image displayed by the CRT 28 can be viewed by the left and right eyes, respectively. When viewing the left and right images separately, glossiness can be enhanced in addition to the stereoscopic effect.

FIG. 4 shows the configuration of the third embodiment. Y
The luminance signal Y and the color signal C corresponding to the composite color video signal from the input terminal 11 are obtained by the / C separation circuit 12. The luminance signal Y is supplied to the V aperture circuit 29, and the color signal C is supplied to the color demodulation circuit 13. V aperture circuit 2
In step 9, the supplied luminance signal Y is subjected to V aperture control processing. Two color difference signals (R
−Y and BY) are supplied to the color enhancement circuit 17. The color enhancement circuit 17 performs color enhancement on the two supplied color difference signals.

The luminance signal Y from the V aperture circuit 29,
The color difference signals RY and BY from the color enhancement circuit 17
Is supplied from the input video signal to generate a video signal whose field frequency is doubled, as shown in FIG. The field double speed circuit 26 generates a field double speed luminance signal 2Y and field double speed color difference signals 2 (RY) and 2 (BY). The generated field double-speed luminance signal 2Y and field double-speed chrominance signals 2 (RY) and 2 (BY) are supplied to the front / rear sense / depth sense circuit 14.

At this time, the sense of depth (parallel convergence) is realized in the front / rear sense / depth sense circuit 14 by changing the read timing of the signal recorded in the field memory for each double-speed field (for each of the left and right eyes). . In the case of the stereoscopic display method using the depth information, if the depth information is modulated by using the differential component according to the change in the luminance level of the video signal or the level of R, G, B, the two-dimensional video signal can also be used. The sense of front and back (three-dimensional feeling) is enhanced.

As described above, the front / rear sense / depth sense circuit 14 performs the front / rear sense and the depth sense from the supplied field double speed luminance signal 2Y and field double speed color difference signal 2 (RY), 2 (BY). The processed luminance signal is
The color difference signal is supplied to the gloss / contrast enhancement circuit 15, and is supplied to the matrix circuit 18. The glossiness / contrast enhancement circuit 15 performs glossiness and contrast enhancement on the supplied luminance signal. In the coring sharpness circuit 30, sharpness is given according to the amplitude of the edge component.

The luminance signal Y from the coring sharpness circuit 30 and the two color difference signals (RY and BY) from the front / rear sense / depth sense circuit 14 are converted into a matrix circuit 18.
Supplied to The matrix circuit 18 forms the field double speed three primary color signals 2R, 2G, and 2B. The three primary color signals are transferred to the CR via the preamplifier and drive circuit 27.
It is supplied to T28. The CRT 28 is configured to display a field double speed color video signal.

In FIG. 4, there is no problem even if the V aperture, the coring sharpness, and the color emphasis are located before the front / rear sense circuit and the depth sense circuit. in this case,
In a two-system stereoscopic display system such as a two-projector system, if such an arrangement is used, only one system is required for circuits such as the V aperture, coring sharpness, and color enhancement. Further, with such an arrangement, the color emphasizing circuit and the V-aperture circuit can execute processing at normal speed. It is desirable that there be a gloss / contrast enhancement circuit after the front / rear sense circuit and the depth sense circuit, but there is no particular restriction on the processing order of the other circuits. The processing may be arranged in a convenient processing order in each system.

In the third embodiment of the present invention shown in FIG. 4, the delay amount of only one of the left-eye video signal and the right-eye video signal is made variable, and the other is fixed. May be controlled.

Next, each component in the first, second and third embodiments will be described.
First, FIG. 5 shows a first example of a more detailed configuration of the front / rear sense / depth sense circuit 14 in which the left / right parallax is added using the front / back sense. The luminance signal Y supplied from the input terminal IN-Y is supplied to the variable delay circuit 34L of the video signal path for the left eye. The delay amount of the variable delay circuit 34L is varied by the detection signal Sd. The color difference signal RY supplied from the input terminal IN-RY is supplied to a fixed delay circuit 35L in the video signal path for the left eye. The color difference signal BY supplied from the input terminal IN-BY is supplied to the fixed delay circuit 35L in the video signal path for the left eye. Variable delay circuit 34
L, the luminance signal Y _L and the color difference signals RY and BY delayed by the delay circuits 35L and 36L are output from output terminals.

Similarly to the video signal path for the left eye, a variable delay circuit 34R and fixed delay circuits 35R and 36R are provided in the video signal path for the right eye. Variable delay circuit 3
The delay amount of 4R is varied by the detection signal Sd ′.

In this example, the left and right images having parallax information are controlled by controlling the horizontal positions of the left and right images in the reverse direction according to the edge information in the input image signal by the variable delay circuits 34L and 34R. Is generated. At the same time, if the object has a large amount of edge information, it is determined to be the foreground, and the fusion is performed in the foreground by the disparity information. On the other hand, if the object has little edge information, the object is determined to be the foreground (background). Is controlled so that fusion is performed later. The amount of edge information is detected based on the luminance signal Y from the Y / C separation circuit 12. That is, the luminance signal Y
Is passed through the high-pass filter 31 and the rectifier circuit 32 to form a detection signal Sd.

The high-pass filter 31 detects a high-frequency component in the luminance signal. This high frequency component (differential component)
Includes positive and negative pulses. Rectifier circuit 32
Rectifies the output signal of the high-pass filter 31 and generates a detection signal Sd having one of positive and negative polarities. As a configuration for detecting the amount of edge information, a configuration other than the high-pass filter 31 and the rectifier circuit 32 is possible. For example, an edge portion may be extracted by digital signal processing, the magnitude of the edge inclination and the amplitude of the edge may be detected, and a detection signal Sd corresponding to the amount of edge information may be generated. Also, instead of the high-pass filter 31, D
As long as a filter or a logic circuit having a function of cutting the C component, that is, a function of detecting an edge (change) of an image, can be configured, it is not necessary to use an analog-accurate high-pass filter.

The variable delay circuit 34L has a delay amount of D−α + Δx, and the variable delay circuit 34R has a delay amount of D + α−Δx. ± α is a fixed delay amount for setting the center fusion plane on the back side of the display surface. Here, the center fusion surface is a surface on which an image determined to be the rearmost is displayed.
Further, for example, (0 ≦ Δx ≦ α), and when α = Δx, the delay amounts of the variable delay circuits 34L and 34R are D
Becomes This is the image that is considered the most foreground,
In that case, an image is displayed on the display surface. actually,
Since the phase of the signal cannot be advanced, the delay time is controlled around the fixed delay amount D. Delay circuit 35
The delay amount of each of L, 35R, 36L, and 36R is D
Fixed to

The detection signal Sd is supplied to the variable delay circuit 34L as a signal for controlling the delay amount Δx of the variable delay circuit 34L, and is also supplied to the inverter 33. The detection signal Sd ′ inverted by the inverter 33 is supplied to the variable delay circuit 34R as a signal for controlling the delay amount Δx of the variable delay circuit 34R. Variable delay circuits 34L and 34R
Then, according to the supplied detection signals Sd and Sd ′,
The variation Δx is varied. In addition, the inverter 33 is not limited to the configuration for inverting the polarity, but may be configured to generate a complementary output. In the complementary configuration, when the level of the detection signal Sd is (0 ≦ Sd ≦ 1), a signal having a level of (1-Sd) is generated as the level of the detection signal Sd ′. The detection signals Sd and Sd 'are output from the variable delay circuit 34.
L, 34R, the luminance signals in the left and right video signals are reversed in the time axis (that is, ± Δx).
Is modulated. That is, the horizontal position of the left and right images is controlled to move in the opposite direction by the detection signals Sd and Sd '. Further, the control based on the detection signals Sd and Sd ′ reflecting the amount of the edge information causes the object having the edge to be fused to one of the front and the rear.

FIG. 6 shows a second example of a more detailed configuration of the front-rear sense / depth sense circuit 14 for adding left-right parallax using the front-rear sense. The difference from the configuration of FIG.
That is, a fixed delay circuit 34R 'is used instead of the variable delay circuit 34R. In the configuration of FIG. 5, the left-eye video signal and the right-eye video signal are controlled so as to be delayed in opposite directions. However, in the configuration of FIG. 6, only one left-eye video signal is controlled and the right-eye video signal is controlled. The signal is given a fixed delay. Since the control is performed in one direction, the amount of delay is halved compared to the control in both directions, but only one variable delay circuit may be used.

In FIG. 6, a fixed delay (D + α) is given to the right eye video signal, and the delay amount (D
+ Α), the amount of delay is controlled by giving a change Δx. However, by giving a fixed delay to the left-eye video signal and giving a change Δx to the right-eye video signal, the amount of delay is reduced. It goes without saying that the same configuration and effect can be obtained even if the control is performed.

Although the time axis (horizontal position) is controlled only for the luminance signal, the two color difference signals may be controlled similarly to the luminance signal. In general, the resolution of the color difference signal is harder to be perceived as compared to the luminance signal, and therefore, control of only the luminance signal has an effect of enhancing the three-dimensional effect (front-back feeling).

FIG. 7 is a block diagram showing a third example of adding the sense of front and rear when operating at the field double speed. The luminance signal Y supplied from the input terminal IN-Y, the input signal IN-
RY supplied from RY and an input terminal IN
The color difference signal BY supplied from -BY is supplied to the field doubling circuit 26. Field doubling circuit 26
Generates a video signal whose field frequency is doubled from the input video signal, as described above.

In this example, the first field (A) in which the pulse signal 2V synchronized with the double-speed field is at a high level
, 1) are used as left-eye video signals, and the low-level second fields (A2, B2,...)
・) Is used as the right eye video signal. The field double speed circuit 61 generates a field double speed luminance signal 2Y and a field double speed color difference signal 2 (RY), 2 (BY).

The double-speed luminance signal 2Y is supplied to a variable delay circuit 34, and the double-speed color difference signals 2 (RY) and 2 (BY) are supplied to fixed delay circuits 35 and 36, respectively. Further, the double-speed luminance signal 2Y is supplied to the high-pass filter 31, and the output signal of the high-pass filter 31 is supplied to the rectifier circuit 32. The high-pass filter 31 and the rectifier circuit 32 generate a detection signal Sd according to the amount of edge information in the luminance signal, as in the first embodiment. The detection signal Sd ′ complementary to the detection signal Sd is formed by the inverter 33.

The detection signals Sd and Sd 'are supplied to two input terminals of the switching circuit 37, respectively. The output of the switching circuit 37 is supplied to the variable delay circuit 34 as a signal for controlling the delay amount α. The switching circuit 37 supplies the detection signal Sd to the variable delay circuit 34 during a period when the pulse signal 2V is at a high level, that is, during a left-eye video signal, and during a period when the pulse signal 2V is at a low level, that is, during a right-eye period. In the period of the video signal for use, the detection signal Sd ′ output from the inverter 33 is
4 is supplied. Accordingly, in the variable delay circuit 34, the video signal for the left eye is delayed by the detection signal Sd, and the video signal for the right eye is delayed by the detection signal Sd '.

The luminance signal from the variable delay circuit 34 and the two color difference signals from the fixed delay circuits 35 and 36 are supplied to the matrix circuit 18. By the matrix circuit 18,
The field double speed three primary color signals 2R, 2G, and 2B are formed.

In the third example shown in FIG. 7, control is also performed such that the delay amount of only one of the left-eye video signal and the right-eye video signal is made variable and the other is fixed. May be.

As the variable delay circuits 34L and 34R, those having the configuration of a digital circuit shown in FIG. 8 can be used. In FIG. 8, an input terminal denoted by reference numeral 41 has an A /
A luminance signal digitized by the D converter is supplied. The luminance signal is sampled at a predetermined sampling frequency, and each sample is converted into 8-bit data.
Reference numeral 42 denotes an input terminal of a sampling clock CK synchronized with the digital luminance signal.

An input terminal 41 is connected in series with an n-stage latch. Each latch has a data input terminal D, a data output terminal Q, and a clock terminal. n stages (n:
The outputs of the 1, 2, 3,..., N) latches are supplied to the selector 43. The outputs of the n-stage latches are delayed by T (T: one cycle of the sampling clock), 2T,..., nT with respect to the input luminance data. Therefore, by selecting one of the input luminance data by the selector 43, it is possible to generate the luminance data delayed for an integral multiple of the clock cycle T. The selector 43 is controlled by the first control signal CTLa.

The sampling clock CK is supplied to the delay circuit 44. The delay circuit 44 delays the sampling clock CK for a time obtained by subdividing one clock cycle T. If a time obtained by equally dividing one clock cycle by m is ΔT (m: 1, 2, 3,..., M), the delay circuit 44
Outputs m sampling clocks each having a delay amount of 0, ΔT, 2ΔT,..., (M−1) ΔT. The delay circuit 44 can be configured by a configuration in which a combination of a plurality of delay lines is changed, a configuration using a time constant circuit, a configuration using a clock having a frequency higher than the sampling clock, and the like.

The sampling clock selected by the selector 45 is supplied to the D / A converter 46. Selector 45
, A control signal CTLb for selecting one of the m sampling clocks is supplied via a latch 49. The digital luminance signal selected by the selector 43 and passed through the latch 47 is supplied to the D / A converter 46. An analog luminance signal is extracted from an output terminal 48 of the D / A converter 46.

In the configuration shown in FIG. 8, when the delay amount is 0, the control signal CTLa controls the selector 43 so that the selector 43 selects a digital luminance signal having a delay amount of n / 2 · T. And m / 2 · Δ
A sampling clock having a delay amount of T
The control signal CTLb controls the selector 45 so that 5 is selected. n / 2 · T and m / 2 · ΔT
Is the center value of the variable delay. This center value corresponds to D-α or D + α described above. In the case of the variable delay circuit 34L, the control signals CTLa and CTLb
Is formed based on the detection signal Sd. In the case of the variable delay circuit 34R, the control signals CTLa and C
TLb is formed based on the detection signal Sd '.

Since inverter 33 is provided, the amount of delay generated between variable delay circuits 34L and 34R has the opposite polarity. That is, in the variable delay circuit 34L, (n / 2 · T) + a · T + (m / 2 · ΔT) + b ·
When a delay amount of ΔT is generated, the variable delay circuit 34R
In (n / 2 · T) −a · T + (m / 2 · ΔT)
A delay amount of −b · ΔT occurs. The values a.T + b..DELTA.T and a.T-b..DELTA.T correspond to the variation .DELTA.x. The delay by the variable delay circuits 34L and 34R is for generating parallax information and enhancing the stereoscopic effect.
What is necessary is just to generate a delay amount of the order. Further, ΔT may be about several nsec.

The variable delay circuits 34L and 34R can be constituted by analog circuits shown in FIG. FIG. 9 shows an input terminal 5 to which an analog luminance signal is supplied.
1 and the base of the transistor 52 are connected. The resistor R has the same value as the collector and the emitter of the transistor 52.
Are connected to the positive power supply terminal 53 and the ground, respectively. The collector of transistor 52 is connected to the base of transistor 54 via coil L and capacitor C. A variable resistance element Rc is connected between the emitter of transistor 52 and the base of transistor 54 in parallel with the series circuit of coil L and capacitor C. The collector of the transistor 54 is connected to the power supply terminal 53, the emitter is grounded via a resistor, and the output terminal 55 is led out of the emitter.

An opposite-phase luminance signal is generated at the collector and the emitter of the transistor 52. The signal phase of the collector output is shifted by the coil L and the capacitor C, and is combined at the base of the transistor 54 with the emitter output via the variable resistance element Rc. The phase shift amount, that is, the delay amount α is controlled by the resistance value of the variable resistance element Rc. Therefore, the analog detection signals Sd, S
By controlling the resistance value of the variable resistance element Rc according to d ′, it is possible to control the amount of delay of the luminance signal extracted to the output terminal 55.

Various types of variable delay circuits 34L and 34R can be used in addition to the configuration shown in FIG. 8 or FIG. For example, a configuration of an analog delay circuit configured by a CCD may be used. Another example is R
A digital circuit configuration using AM can also be used.

As described above, the polarities of the modulation of the left-eye image and the right-eye image are reversed, that is, the movement (modulation) direction of the time axis is reversed. Thereby, when only one eye signal is modulated, 2
Double parallax occurs. In the first embodiment, if the detected amount of the high-frequency component is sufficiently large, that is, if it is the focus area, it is determined that the object is a foreground object, and conversely, if the detection of the high-frequency component is small, that is, it must be the focus area. For example, it is determined that the object is in the background, and is set to the back. That is, the left-eye image is moved to the left by a certain amount, and the right-eye image is moved to the right by that amount, and based on this, the detection signals Sd and Sd ′ obtained by the previous and subsequent detections, By controlling the variation Δx, the display position of the image is modulated left and right. The stereoscopic image fused from the left and right images obtained by this operation appears to be located at a certain depth behind the display surface, and based on this, the left and right parallax (front-back feeling) determined by the sharpness of the previous image edge Will be added to the video.

Referring to FIG. 10, a description will be given of a process for enhancing the three-dimensional effect (front-back feeling) by the above-described front-back feeling / depth-sensing circuit 14. FIG. In FIG. 10, the horizontal axis is the time axis (that is, the position in the horizontal direction), and the vertical axis is the level. Signals S1 and S11 shown in FIGS. 10A and 10B are inputs to variable delay circuits 34L and 34R when −α + Δx and α−Δx are 0. However, the signals S1 and S11 are output from these variable delay circuits 3
It is assumed that a fixed delay D of the delay amounts of 4L and 34R has been received.

The example of FIG. 10A shows a process for a signal (object) S1 having a steep and large front edge E1 and rear edge E2 in the input video signal. The signal S1 is
It is supplied to variable delay circuits 34R and 34L. α-Δ
The outputs of the variable delay circuit 34R having the delay amount of x and the variable delay circuit 34L having the delay amount of -α + Δx are represented by signals S1R and S1L. The signal S1R is displayed on the display surface 61 as a right-eye image 63R, and the signal S1L is displayed on the display surface 61 as a left-eye image 63L. The right-eye image 63R and the left-eye image 63L displayed on the display surface 61 are
R and the left eye 62L, and a virtual image 6
It is displayed as shown in FIG. 4A.

Since the signal S1 shown in FIG. 10A has a steep and large front edge E1 and rear edge E2, the variation Δx is large. Thereby, FIG. 10A
As shown in (2), the deviation between the right-eye image 63R and the left-eye image 63L on the display surface 61 is reduced. Thus, the change Δx
By increasing the value of, the amount of movement from the reference position to which ± α is added increases, and the parallax information decreases. As a result, the virtual image 64 </ b> A is fused at a position protruding considerably before the center fusion plane 65, that is, near the display surface 61.

In the example of FIG. 10B, processing is performed on a signal (object) S11 having a front edge E11 and a rear edge E12 having a gentle inclination in an input video signal. Signal S1
1 is supplied to the variable delay circuits 34R and 34L, and output signals thereof are indicated by S11R and S11L. The signal S11R is displayed on the display surface 61 as a right-eye image 63R, and the signal S11L is displayed on the display surface 61 as a left-eye image 63L. Right eye image 63R displayed on display surface 61
And the left eye image 63L includes the right eye 62R and the left eye 62L.
And displayed as shown in the virtual image 64B.

Since the signal S11 shown in FIG. 10B has a front edge E11 and a rear edge E12 with gentle slopes, the variation Δx is small. As a result, FIG.
As shown in FIG. 0B, there are many deviations between the right-eye image 63R and the left-eye image 63L on the display surface 61. As described above, by reducing the value of the change Δx, the amount of movement from the reference position to which ± α has been added is reduced, and the parallax information is large. As a result, the virtual image 64B is fused near the central fusion plane 65.

As described above, the center fusion surface 65 is moved to the display surface 61.
Instead, it is set farther than the display surface 61. That is, the left-eye image 63L is moved to the left by a fixed amount by the fixed delay amount α, and the right-eye image 63R is moved to the right by that amount. The display position of the image is modulated left and right by controlling the variation Δx in accordance with.

More specifically, as shown in FIG. 10A, when a signal including a steep and large edge is supplied and it is determined that the signal is in the foreground, the change Δx has a large value, and the delay time of the variable delay circuit 34L ( D−α + Δx) increases,
The left-eye image 63L moves rightward on the display surface 61. On the other hand, since the delay time (D + α−Δx) of the variable delay circuit 34R decreases, the right-eye image 63R moves leftward on the display surface 61. As a result, the parallax information is reduced, and as a result, the virtual image 64A appears to be considerably protruded from the center fusion plane 65.

As shown in FIG. 10B, when a signal including a gentle edge is supplied and it is determined that the background is present,
Since the change Δx becomes a small value and the increase in the delay time of the variable delay circuit 34L decreases, the left-eye image 63L moves little to the right on the display surface 61. On the other hand, since the decrease in the delay time of the variable delay circuit 34R is reduced, the right-eye image 63R is less likely to move leftward on the display surface 61.
As a result, the amount of decrease in the parallax information is small, and the virtual image 64B appears to have a small amount of protrusion toward the display surface 61 side from the central fusion surface 65.

As described above, when comparing the case of the edge having a high sharpness as shown in FIG. 10A and the case of the gentle edge as shown in FIG. It can be seen that the amount of parallax information is smaller in the case of a high edge. The fact that the amount of parallax information is small means that the image is fused closer to the display surface, and the parallax information is reduced as the image is closer to the foreground.

In the above description, a method of fusing an image deeper than a display surface using parallel convergence has been described. Specifically, when the image is fused by parallel convergence, the center fusion plane 65 which is the deepest surface (background) of the image is used as a reference for convergence, and as shown in FIG. The delay amount is set such that the edge part with a high degree is left and right parallax so as to be considerably in front, and as shown in FIG. 10B, the gentle edge part is left and right parallax so as to be slightly in front of the center fusion plane. Is modulated.

By changing the amount of parallel convergence (the delay amount ± α of the variable delay circuits 34L and 34R) of the center fusion plane serving as the reference, the background (reference) of the fused image can be set at an arbitrary position. It is possible to move. For example, if the delay amount α is set to be sufficiently large, the central fusion plane is fused considerably deeper than the display surface. In this case, although the amount of change Δx in the left and right parallax for which the detection of the front and rear sensation (left and right parallax) is detected does not change, the absolute value of the left and right parallax increases, so that the modulated front and rear sensation (three-dimensional feeling) is emphasized. .

If the absolute value of the delay amount α is decreased with the same polarity as described above, it is felt that there is an image fused around the display surface 61. When the delay amount α = 0, the background (the center fusion surface 65) is on the display surface 61, and the focus point with sharpness appears to be fused before the display surface 61. If the polarity of the delay amount α is reversed, the entire image is fused before the display surface 61.
At this time, the fused image looks smaller than the actual size on the display surface (see FIG. 36A).

As shown in FIG. 11A, the left-right parallax amount on the display surface 61 is a, the standard eye width of a human is 65 mm,
The distance between the display surface 61 and the human eye 62 is 1 m (= 1000
mm), the depth X ₀ at which the image is fused is a / X ₀ = 65 / (1000 + X ₀ ), and therefore X ₀ = (1000 × a) / (65−a).

As can be seen from this equation or the graph shown in FIG. 11B, the left-right parallax amount a on the display surface 61 and the depth X ₀
As can be seen from the relational expression, when the amount of parallax on the display surface 61 decreases from 65 mm and the amount of left and right parallax a <0, a transition is made from parallel convergence to cross convergence. That is, when the left-right parallax a on the display surface 61 is in the range of (65 mm ≧ a> 0), parallel convergence occurs, and in the range of (0> a), cross convergence occurs. As can be seen from FIG.
The ratio (that is, sensitivity) of the change in the depth sensation (the front-back sensation) with respect to the left-right parallax amount a at 1 decreases (ie, the sensitivity). For this reason, when the cross convergence is used, the front-back sensation (three-dimensional sensation) obtained by modulating the left-right parallax by detecting the front-back sensation is reduced as compared with the case where the parallel convergence is used as in the present invention. By changing the reference congestion amount in this way, it is possible to select a preferable image.

As described above, when the image is stereoscopically viewed due to the cross convergence, the image looks smaller than the actual size on the display surface, and the change in the sense of depth (the sense of front and rear) with respect to the left-right parallax amount a on the display surface 61. (Ie, the sensitivity) decreases.

By changing the reference amount of convergence as described above, it is possible to select a preferable stereoscopic image. The reason why the time axis modulation is not performed on the two color difference signals is that resolution is not so required due to the characteristics of the eye color difference signals. Of course, there is no problem even if the time axis modulation similar to the luminance (Y) is performed on the two color difference signals.

The front / rear / depth feeling circuit 14 may use focus information instead of edge information.

The above-described front / rear sense / depth sense circuit 14 is configured to use edge information based on a luminance signal. In the present invention, edge information may be used based on the three primary color signals R, G, and B in addition to the luminance signal.

FIG. 12 shows a first example of a configuration for detecting edge information based on the three primary color signals R, G, B, FIG. 13 shows a second example, and FIG. 14 shows a third example. Show. These three configuration examples are applied to FIG. 5 described above. A luminance signal from the Y / C separation circuit 12 and two color difference signals from the color demodulation circuit 13 are converted into a matrix circuit 66.
Supplied to

The three primary color signals R, G and B generated by the matrix circuit 66 are supplied to the maximum value detection circuit 67. The maximum value detection circuit 67 detects the maximum value among the three primary color signals R, G, and B, and outputs the detected maximum value. The output signal of the maximum value detection circuit 67 is supplied to the rectification circuit 32 via the high-pass filter 31, and the rectification circuit 32 outputs a detection signal S
d occurs. The detection signal Sd is generated based on the signal detected as the maximum among the three primary color signals.

The delay amount of the variable delay circuit 34L is controlled by the detection signal Sd from the rectifier circuit 32. This control is performed so that the stereoscopic effect is enhanced based on the edge information, as described above. The luminance signal Y from the variable delay circuit 34L, the color difference signal (RY) from the fixed delay circuit 35L, and the color difference signal (B−
Y) is supplied to the matrix circuit 18. In the configuration of FIG. 5, the detection signal Sd is supplied to the variable delay circuit 3 via the inverter.
4R.

In the configuration shown in FIG.
6, the three primary color signals are output from the high-pass filter 31R,
31G and 31B, respectively. The respective outputs of the high-pass filters 31R, 31G, 31B are supplied to the rectifier circuits 32R, 32G, 32B. Rectifier circuit 32
The output signals of R, 32G, and 32B are output from the maximum value detection circuit 143.
Supplied to The maximum value among the output signals of the rectifier circuits 32R, 32G, and 32B is taken out as the detection signal Sd at the output of the maximum value detection circuit 68. The configuration in FIG. 13 performs a process of generating a detection signal based on each of the three primary color signals, and outputs the maximum value of the generated signals as a detection signal Sd.

In the third example shown in FIG. 14, the above-described FIG.
Similarly to 3, the three primary color signals formed by the matrix circuit 66 are supplied to the high-pass filters 31R, 31G, and 31B, respectively. High-pass filters 31R, 31G, 31B
Are supplied to the rectifier circuits 32R, 32G, 32B. Output signals of the rectifier circuits 32R, 32G, and 32B are supplied to the maximum value detection circuit 68. Rectifier circuit 32
The maximum value among the output signals of R, 32G, and 32B is detected by the maximum value detection circuit 68. The detected maximum value is supplied to the area expansion / detection circuit 69, and the detection signal Sd is extracted for each area. The configuration in FIG. 13 performs processing for generating a detection signal based on each of the three primary color signals, and generates a detection signal Sd based on the maximum value of the generated signals.

In the area expanding / detecting circuit 69, the area surrounded by the external edge of the target object is processed as the area of the target object. That is, the area extension / detection circuit 6
In step 9, a block including an external edge is detected first, and then a region surrounded by the block including the external edge is detected. Then, a block including the outer edge and a region surrounded by the block including the outer edge are combined to form a target object region. Specifically, the area of the target object is detected from the blocks expanded to the number of MAXH blocks in the X direction and the number of MAXV blocks in the Y direction around the basic block. The enlarged block contains almost the outer edge of the target object, but if it is difficult to include the entire area of the object just by including the edge, re-expand and fill in the blocks including the outer edge. Process.

As described above, in the process of detecting the sense of front and rear from the sharpness of the edge information, the area expansion / detection circuit 69 estimates the edge information at which the sense of front and rear is detected,
As the image is further extended, the sense of front and rear is detected in units of regions.
By giving the left and right parallax for each of the detected regions, a sense of front and rear for each region can be obtained. A detection signal Sd is output from the area expansion / detection circuit 69 based on the sense of front and rear for each area.

The method of detecting the sense of front and rear based on the three primary color signals R, G, and B is different from the method of detecting this from the luminance signal in comparison with the matrix circuit 66 and the maximum value detection circuits 67 and 6.
8. Although the area expansion / detection circuit 69 is required, a more natural sense of back and forth can be generated. The configuration shown in FIG. 12, FIG. 13 or FIG. 14 is not limited to the first embodiment using the projector, but the second embodiment using the double-speed field processing.
Also, the present invention can be applied to the third embodiment.

Next, the gloss / contrast enhancement circuit 15
FIG. 15 shows a circuit diagram of an example of the above. FIG. 15 is a circuit diagram showing an example of a two-projector stereoscopic display.
The luminance signal Y separated by the Y / C separation circuit 12 is supplied to the input terminal 71. 72 is a power supply line to which a positive power supply voltage + Vcc is supplied, and 73 is a ground line. An input luminance signal is provided to the base of transistor Q1. The transistors Q1 and Q2 form a differential amplifier. The emitters of transistors Q1 and Q2 are connected via a resistor R1. A series circuit of a diode Da and a resistor R3 is connected in parallel with the resistor R1. The base of the transistor Q2 is grounded, and its collector is connected to the power supply line 7 through the collector resistor R2.
2, and the processed luminance signal Y 'is extracted from an output terminal 74 derived from the collector.

The input terminal 71 is connected to the base of the transistor Q1 and the base of the transistor Q4 via the transistor Q3 and the variable resistor VR1 for level shift. Transistor Q4 has an emitter-follower configuration, and its emitter is connected to the emitter of transistor Q2 via diode Db and resistor R4. Diodes having a forward voltage drop of, for example, 0.6 V (corresponding to a video signal level of about 80 IRE) are used as the diodes Da and Db.

In the configuration of FIG. 15, diodes Da,
Db detects a high-luminance part. That is, when the level of the luminance signal is represented by (0 to 100) IRE, for example, 80IR
When a luminance signal Y having a luminance higher than E is supplied, the diode Da starts to turn on. For example, 100IRE = 0.67
V. Further, the luminance signal Y has a higher luminance (for example, 9
0IRE or more), the diode Db starts to turn on.

The gain of the differential amplifier including the transistors Q1 and Q2 is determined by the ratio between the emitter resistance and the collector resistance R2. When the level of the luminance signal Y is low (not high luminance), the diodes Da and Db
Is OFF, the emitter resistance R1 and the collector resistance R
The gain is determined by the ratio of 2.

When the luminance signal Y of 80 IRE or more is input to the differential amplifier, the diode Da starts to turn on. This reduces the emitter resistance from R1 to R1 // R3 (// means parallel connection of the resistors). (R1 // R3 = R1
× R3 / R1 + R3). Therefore, the gain of the differential amplifier increases from R2 / R1 to R2 / R1 // R3.
Thus, when a luminance signal of 80 IRE or more is input,
Brightness can be further increased. That is, the luminance is increased, and the gamma can be raised.

Further, when a luminance signal Y of 90 IRE or more is input, the diode Db starts to be turned on in addition to the diode Da. As a result, the emitter resistance becomes R1 // R3
// R4 and further decrease. (R1 // R3 // R4 =
R1 × R3 × R4 / R1 × R3 + R3 × R4 + R1 × R
4). Therefore, the gain of the differential amplifier is R2 / R
It increases to 1 // R3 // R4. Here, a luminance difference can be given to the left and right eyes by turning on the diode Db only for the signal of the left eye (one field at the time of double speed). This makes it possible to feel a glittering feeling.

The video signal in which the gamma of the high luminance portion is set drives the CRT. The CRT has a function (ABL) for preventing an excessive current from flowing within a predetermined time.
(Aoutmatic Beam Limiter) function, and when a current exceeding a certain value flows, feedback (negative feedback) that automatically lowers the DC potential of the drive voltage is applied. By skillfully using this function, the potential of the high-brightness area is raised, and at the same time, the ABL function is activated to further increase the brightness, lowering the DC potential in the black part of the shadow area to emphasize the shadow, and The contrast can be enhanced. As a result, an image in which the unevenness (three-dimensional effect) is emphasized can be realized.

Next, the gloss / contrast enhancement circuit 15
FIG. 16 shows a circuit diagram of another example. FIG. 16 is a circuit diagram of an example of a case of stereoscopic display using a field double speed CRT. The difference from the configuration of FIG.
That is, a switching circuit 75 is inserted between the transistor Q2 and the emitter of the transistor Q2. This switching circuit 7
5 is turned on / off by a pulse signal 2V synchronized with the double speed field. That is, the switching circuit 75 is turned on during a period in which the pulse signal 2V corresponding to the period of the left-eye image is at a high level, and is switched during a period in which the pulse signal 2V corresponding to the period of the right-eye image is at a low level. The circuit 75 turns off.

As described above, the glossy portion including the switching circuit 75 controlled by the pulse signal 2V processes the luminance signal as described below, as understood from the above description. First, the luminance of the high-luminance portion (80 IRE or more and less than 90 IRE) of the left-eye (first field) luminance signal and the right-eye (second field) luminance signal is further increased. Further, in a high-luminance portion of 90 IRE or more, the luminance is increased only for the luminance signal for the left eye. By providing such a glossy portion, a three-dimensional appearance and a glossiness can be enhanced.

In the case of performing the field doubling process, the brightness of only the video of one field is made higher.
AB that limits the beam current according to the average value of the beam current
The degree to which the L function is exerted is smaller than in the case where the field doubling process is not performed, and the effect of making the shadow part blacker is weakened. However, on the other hand, the luminance can be increased, so that the luminance in the glossy portion is sufficiently increased. As a result, the lit area of one field (the image for the left eye) is saturated with the beam on the phosphor screen of the CRT, and expands. Since the direction is enlarged in the scanning direction, when the luminance of the glossy portion of the left-eye video signal is increased, the center of the glossy portion moves in the scanning direction and rightward on the screen. In order to fuse the left-eye image with the right eye (the image at the original position that is not saturated), the glossy portion appears to protrude from the surroundings. As a result, when the luminance of the left-eye video signal is increased in the glossy portion, the unevenness is further enhanced.
Further, by separating the image for the left eye and the image for the right eye with glasses having shutters, it is possible to enhance the glossiness (the glossiness of the glossy portion).

In the present invention described above, a portion having a high luminance is detected based on a luminance signal input to the matrix circuit, and the level of the luminance signal is raised. Although this configuration is simple in terms of the circuit configuration, it raises the level of only the luminance signal, and thus has a problem that the color gain is reduced in the high luminance portion.

Next, the gloss / contrast enhancement circuit 15
FIG. 17 shows an example in which the glossiness is enhanced. The luminance signal Y supplied from the input terminal IN-Y is supplied to the glossy portion detection circuit 81. The glossy part detection circuit 81 detects a glossy part from the supplied luminance signal Y. In the gloss enhancement circuit 82, the detected gloss portion is enhanced and output.

FIG. 18 shows another example of the gloss / contrast enhancing circuit 15. Another example is the field double speed CR
This is a case where T is used, and a process of detecting a high-luminance portion and enhancing the level is performed by the three primary color signals R,
This is performed based on G and B. In FIG. 18, 8
Reference numeral 1 denotes a glossy portion detection circuit, which is provided with 83R, 83G, and 83B.
Is a glossy portion emphasizing circuit that performs a process of increasing the luminance of the high luminance portion for each of the three primary color signals. The glossy part detection circuit 81 calculates (Y = 0.3R + 0.59
(G + 0.11B), a high-luminance portion is detected using the luminance signal generated by the matrix operation.

The detection signal from the gloss detection circuit 83 and the pulse signal 2
V is supplied. As mentioned above, for example, 80 IRE
In the above, a high luminance portion of less than 90 IRE has higher luminance for both the left-eye and right-eye video signals.
In a high luminance portion equal to or higher than E, the luminance is increased only for the left-eye video signal.

FIG. 19 shows still another example of the gloss / contrast enhancing circuit 15. This still another example is a case where a field double speed CRT is used. A glossy portion detection circuit 81 to which a luminance signal 2Y is supplied is provided, and a glossy portion emphasizing circuit 83R,
83G and 83B are controlled. Since the configuration shown in FIG. 18 or the configuration shown in FIG. 19 controls the levels of the three primary color signals, the size of the circuit configuration is larger than the method of controlling only the level of the luminance signal. As a result, there is an advantage that the problem that the color gain is reduced does not occur. In the first embodiment using two projectors shown in FIG. 1, it is also possible to detect a high-luminance portion and enhance the luminance by using three primary color signals.

As described above, the CRTs 21L and 21R are output by the video signal in which the luminance of the high luminance level is further enhanced by the gloss / contrast enhancement circuit 15.
And 28 are driven. This CRT 21L, 21
R and 28 are provided with a protection function (ABL function) for preventing an excessive current from flowing within a certain period of time.
When a current of a certain value or more flows due to the ABL, feedback (negative feedback) is automatically applied to lower the DC potential of the drive voltage.

FIG. 20 shows an ABL provided on the CRT 28.
1 shows an example of a circuit. The three primary color signals are supplied to a preamplifier & video output circuit 92 via a DC reproduction circuit 91. The three primary color signals E _R , E _G , and E _B from the circuit 92 are output to a CRT.
28 are applied to each of the three cathodes. CRT2
A high voltage obtained by rectifying a high voltage pulse generated in a high voltage winding 95 of a flyback transformer 94 by a diode 96 is applied to the anode 93 of the eighth electrode 8.

The high voltage winding 95 is grounded via a capacitor 97. The capacitor 97 forms an average value of the beam current (hereinafter, simply referred to as beam current _IHV ). The connection point between the high-voltage winding 95 and the capacitor 97 is a resistor R1
1 and a terminal of power supply voltage + Vbb via a series circuit of R12. Further, a resistor series circuit including a variable resistor VR2 for brightness adjustment is connected between the terminal of the power supply voltage + Vcc and the ground. The mover of the variable resistor VR2 is connected to the luminance control terminal 98 of the DC reproduction circuit 91, and is connected to the connection point of the resistors R11 and R12 via the diode 99 in the forward direction. When the control voltage supplied to the luminance control terminal 98 decreases, the DC component of the signal supplied to the CRT 28 decreases, and the beam current decreases.

In the configuration shown in FIG. 20, the potential at the connection point between resistors R11 and R12 is Vd, and the potential at the connection point between the mover of variable resistor VR2 and the anode of diode 99 (that is, the brightness control terminal 98 of DC regeneration circuit 91). Is a control voltage supplied to Vb. (Vd = Vbb-R1
1 × I _HV ). CRT according to the level of three primary color signals
When the beam current I _HV flows through 28, the potential Vd decreases as the beam current I _HV increases. And Vd <
When the voltage reaches Vb, the diode 99 starts to turn on. As a result, a shunt current It flowing through the diode 99 is generated, and the control voltage Vb supplied to the luminance control terminal 98 starts to decrease. As a result, the DC component of each primary color signal is reduced,
Negative feedback works to lower the beam current. In this way, the ABL circuit protects against a beam current exceeding a specified value from flowing.

As described above, when the luminance (signal level) of the high luminance portion is increased, the DC potential of the dark portion of the shadow portion is lowered to the black side by the function of the ABL circuit. In other words, the shaded portion of the subject can be expressed more black. As a result, the contrast can be enhanced. In this way, an image in which the unevenness (three-dimensional effect) is emphasized can be displayed.

Next, FIG. 21 shows a circuit diagram of an example of the V aperture control of the V aperture control / coring sharpness circuit 16. FIG. 21 shows an example of five taps. A luminance signal in which the gamma of the high luminance part is set is input from the input terminal,
Input luminance signal is supplied to the 1-line delay circuit 101 ₁ and the multiplier 103 _0. In this V-apache,
One-line delay circuit of four stages in the vertical direction 101 _{1-101 4}
Whose outputs are multipliers 103 _{1 to} 103 _1, respectively.
₄ is connected. The one-line delay circuit 10
1 _1, 101 _2, 101 output of _3, the tilt detection circuit 10
Is supplied to the 2, the output of one-line delay circuit 101 ₂ is supplied to the adder 107. The inclination detection circuit 102 detects the inclination of the input luminance signal, that is, edge information. The multiplication coefficients of the multipliers 105 ₁ and 105 ₂ are varied according to the detected edge information.

In the multipliers 103 _{0 to} 103 ₄ , the supplied luminance signals are multiplied by tap coefficients α _{0 to} α ₄ , and the multiplication result is supplied to the addition circuit 104. The addition circuit 104 performs addition of five lines delayed for each supplied line. The result of the addition is the multiplier 1
05 ₁ and 105 ₂ . In the multiplier 105 ₁ , multiplication is performed, and controlled by the inclination detection circuit 102, and the variable multiplication coefficient αX is multiplied by the supplied signal. The multiplier 105 _2, multiplication is performed is controlled by the inclination detection circuit 102, the variable multiplicative factor αY is multiplied with the supplied signal. In the adder 106, the positive-side aperture control component from the multiplier 105 ₁ and the multiplier 105
The negative aperture control component from ₂ is added. The added aperture control signal is supplied to the adder 107. In the adder 107, and the aperture control signal edge enhancement from the adder 106, the signal from the 1-line delay circuit 101 ₂ through a delay circuit 108 for match the horizontal phase to the aperture control signal is added. The result of the addition is output from the output terminal.

Since normal light comes from above, it is often shaded in the vertical direction. Using this property to raise the frequency of the vertical transient from low to mid range,
The shadow of light can be effectively lifted, and a three-dimensional image can be created. Here, the vertical line memories (one-line delay circuits 101 ₁ , 101 ₂ ,.
・ ・) Is desirable to have about 10 to 20
Sufficient performance can be obtained with seven wires.

More specifically, the falling edge of an object (where a light portion changes to a dark portion) and the rising edge (where a dark portion changes to a bright portion)
By changing the strength and characteristics of the aperture control, effective shadow enhancement is realized. For example, the aperture control at the falling edge portion works effectively, but the effect is small at the rising edge portion. Also, the aperture control on the white side is glaring. In consideration of the above, an effective V aperture control is realized by changing the intensity of the aperture control at the rising edge portion and the falling edge portion, or by changing the intensity between the white side and the black side.

Next, FIG. 22A is a circuit diagram showing an example of the coring sharpness of the V aperture control / coring sharpness circuit 16. In the HPF 111, a luminance signal is supplied via an input terminal. The HPF 111 extracts a high-frequency component from the supplied luminance signal. The signal from which the high-frequency component has been extracted is supplied to the level limiter 11.
2. In the level limiter 112, only a signal having a relatively large amplitude is extracted from the supplied signal.
Examples of the characteristics of the level limiter 112 are shown in FIGS.
C, shown in FIG. 22D. In the adder 113, the signal for sharpness from the level limiter 112 and the signal from the input terminal are added, and the addition result is output from the output terminal as an output of coring sharpness.

More specifically, the frequency component of the edge portion of the object in focus with the camera is high, and the amplitude of the edge component is often high. Utilizing this property, sharpness corresponding to the amplitude component is given only to edges having high frequency components and relatively large amplitude components. As a result, an image in which the edge of the focused object is emphasized is obtained, and a three-dimensional effect is expressed.

Next, an example of the configuration of the color emphasizing circuit 17 will be described with reference to FIG. The luminance signal Y supplied from the input terminal IN-Y, the color difference signal RY supplied from the input terminal IN-RY, and the color difference signal BY supplied from the input terminal IN-BY are supplied to the matrix circuit 121. You. The matrix circuit 121 forms three primary color signals R, G, and B from the supplied luminance signal Y and the two color difference signals RY, BY. Such signal processing is similar to that of a known television receiver. Also, audio signal processing is omitted for simplicity.

The three primary color signals R, G, and B output from the matrix circuit 121 are supplied to the skin color detection circuit 122 and also to the color component detection circuit 123. The skin color detection circuit 122 detects whether or not the supplied three primary color signals R, G, B are skin color components by a predetermined method. Although details will be described later, when the three primary color signals R, G, and B are at a predetermined ratio, the colors represented by the signals R, G, and B are assumed to be flesh colors, and the signals R, G, and B are assumed to be flesh color components. Is done. The detected flesh color component is converted into, for example, a voltage, output as a voltage E _skin, and output. That is, whether or not the skin color component is present depends on the ratio of the signals R, G, and B, and is not affected by the absolute value. Therefore, in the case of a darker skin color, the value of the voltage E _skin becomes lower. This voltage E _skin is supplied to one input terminal of the subtractor 124 and to the color component detection circuit 123.

The color component detection circuit 123 outputs the three primary color signals R,
Based on G, B and voltage E _skin , other than the skin color component,
The other color components are detected. The other detected color components are converted into, for example, a voltage, output as a voltage E _other, and output. If the area to be detected is a skin color component, the voltage E _other is set to 0. If the area is a color component different from the skin color component, the voltage E _other is generated based on the degree. The voltage E _other is supplied to the other input terminal of the subtractor 124.

The voltage E _skin is subtracted from the voltage E _{other in the} subtractor 124. The result of the subtraction is supplied to a gain control amplifier (GCA) 125 as a control voltage. If the color of the detected area is a skin color component, the voltage E _other is set to 0, and the subtraction result is the voltage E _skin
It is said. On the other hand, when the detection area is a color component other than the skin color, the voltage E _other is generated, and the result of the subtraction by the subtractor 124 is a higher value than when the voltage E _skin alone is used.
The gain of GCA 125 is changed according to the voltage obtained as a result of the subtraction. That is, the result of the subtraction is the voltage E
If it is _skin , the gain is set to 1. If it is equal to or higher than the voltage E _skin , the gain is increased according to the voltage value.

FIG. 24 shows GCA1 on the xy chromaticity diagram.
25 shows an example of a region where the gain of 25 is enhanced. The gain is set to 1 in a region shown as a flesh color in the drawing. As the detected color component moves away from the skin color area on the chromaticity diagram, the gain is increased. In this case, the gain is 1
To 1.5. It should be noted that the degree of gain enhancement is made different depending on the direction away from the skin color area on the chromaticity diagram.

In this manner, the color gain is set to 1 in an area of the image where the skin color is detected, and the color gain is increased based on the voltage value of the voltage E _{other in} the area other than the skin color area. Therefore, it is possible to increase the color gain in an area other than the area where a flesh color is detected in the image, and thereby,
It is possible to enhance the color contrast in areas other than the skin color area.

Next, a method of generating the voltage E _skin and the voltage E _other will be described with reference to FIGS. 25 and 26. An arbitrary color is determined by the amounts of R (red), G (green), and B (blue), which constitute the three primary colors. Thus, in the example video signal composed of respective signals of the three primary colors, R, G, voltage E _R corresponding to each of the B, E _G, the value of E _B, the color determination is made.

On the other hand, it is known that when each of the R, G, and B colors has a specific relationship, the color is regarded as a flesh color. For example, the ratio of each color of R, G, B is 1.64:
When the ratio is 1.51: 1, the color is regarded as a flesh color. In another example, when R: G: B is 1.43: 1.1, the color is considered to be flesh color. Here, R: G:
B = 1.64: 1.51: 1 is defined as a skin color. That is, in the video signal, the color projected when the ratio of the voltages E _R , E _G , and E _B is 1.64: 1.51: 1 is perceived as a flesh color.

Here, from a different point of view, it is assumed that an arbitrary color is composed of a flesh color component and other color components. in this case,
_Assuming that the _skin color component is C _skin and the other color components are C _other1 and C _other2 , _conversion from any of the colors R, G, and B to colors C _skin , C _other1 , and C _other2 based on the skin color components is established. When this is applied to the video signal, the voltage of the _skin color component is set to E _skin, and the voltages of the other color components are set to E _other1 , E other
_{If other2} is set, the voltages E _R , E _G ,
The E _B, voltage based on the skin color component E _skin, E _other1, E
It means that it can be converted to _other2 .

The skin color component is obtained by the skin color detection circuit 122. The skin color detection circuit 122 includes, for example, an analog arithmetic unit, and the detection of the skin color component is performed as follows, for example. The voltages E _R , E _G , and E _B of each color at the time of skin color are represented by K _R , K
_G, and K _B. As described above, R: G of the skin color component:
Since the ratio of B is 1.64: 1.51: 1,
A _{K R> K G> K B} . Therefore, normalized by K _B where the amplitude is _{minimum, K R: K G: K} B = K R ': K G': 1 to.

[0127] The K _R ', K _G' normalizes E _R, E _G, E _{B in, E R ', E G'} , ' _{When, E R' E B = E} R / K R 'E G '= E _G / K _G ' E _B '= E _B That is, when the skin ^{_{color, E R ': E G'}} : E B
^' = 1: 1: 1. FIG. 25 shows the three primary color signals E _R , E _G , and E _B of the skin color shown on the left side of the figure as K _R ′, K
An example is shown in which E _R , E _G , and E _B are normalized by _G ′.

[0128] Thus, any color, R in the skin color, G, B colors of the ratio _{K R ', K G',} K B '(= 1)
And the minimum value among the obtained values is used as the skin color component. That is, as shown in FIG. 25, the voltage value E _skin corresponding to the skin color component is obtained as E _skin = min (E _R ′, E _G ′, E _B ′). When the target color is a flesh color, as shown on the left side of FIG. 25, E _skin = E _R '= E _G ' = E _B '.

The color components other than the flesh color are obtained by the color component detection circuit 123. The color component detection circuit 123
For example, an analog arithmetic unit is used, and the detection of color components other than the skin color is performed by E _R ′, E _G ′, and E _B ′.
_This is done by subtracting the _skin and adding the results of each subtraction. That is, the voltage value E _other corresponding to another color component
Is E _other = E _R ^' + E _G ^' + E _B ^' -3 min
(E _R ^' , E _G ^' , E _B ^' ).

In the following, the "voltage value E _skin corresponding to the _skin color component" is referred to as " _skin color component E _skin ", and the "voltage value E _other corresponding to the other color component" is referred to as "other color component E _other ".
Called.

FIG. 26 shows a skin color component E in an actual color.
An example with _skin and other color components E _other is shown. FIG. 26A
Is an example of white color, and E _R , E _G , and E _B are equal to each other as shown on the left side of FIG. 26A. The white K _R ',
K _G ', K _B' when normalized, as shown on the right side of FIG. 26A, E _R 'is smallest. At this time, the skin color component E _skin and the other color components E _other are obtained as follows.

First, the component having the minimum value after the normalization is set as the skin color component _Eskin . In the example of FIG. 26A,
E _R 'is _defined as a _skin color component E _skin . The skin color component E is obtained from each of the other components E _G ^′ and E _B ^′ after the normalization.
_{The skin} is reduced and the other ingredients E _G ^' and E _B ^'
converted to _other1 and E _other2 . That is, E _other1 = E _G ^' -min (E _R ^' , E _G ^' , E _B ^' ) and E _other2 = E _B ^' -min (E _R ^' , E _G ^' , E _B ^' ). Based on these, the other color components E
_other is generated as E _other = E _other1 + E _other2 .

In the examples shown in FIGS. 26B and 26C, the _skin color component E _skin and other color components E _other are obtained based on the same idea. In the example of a single blue color shown in FIG. 26B, the skin color component E _skin is set to 0, and the other color components E _skin
other is the value of a single color component. Further, in any color example as shown in FIG. 26C, as described above, the minimum value after the normalization (E _G 'in this example) skin color component E _skin
Is a component showing a value exceeding the E _skin after normalization (E _R 'and E _B' in this example), the difference between E _skin is respectively E _other1 and E _other2.

Thus, the two outputs, the skin color component E _skin and the other color component E _other , obtained by the skin color detection circuit 122 and the color component detection circuit 122, respectively, are applied to one and the other inputs of the subtractor 124, respectively. At the end, a subtraction is made. That is, in the subtractor 124, E _other
A subtraction output of _-Eskin is generated. The gain of the GCA 125 is controlled using the subtraction output.

That is, in the area where the skin color is detected, the voltage E _other becomes 0, so that the subtraction output of the subtractor 124 is
-E _skin . The gain of the GCA 125 is set to 1 when the _skin color is the voltage of the detected area, that is, -E _skin . As a result, the color gain of the skin color area is set to 1. On the other hand, in the region other than the skin color region, the subtraction output (E _other −E _skin ) of the subtractor 124 increases because the voltage E _other is generated. Therefore, the color gain in GCA 125 increases according to the value of voltage E _other . Also, the smaller the skin color component, the higher the subtraction output of that area and the higher the color gain. As described above, the color gain of the area other than the area where the skin color is detected is increased.

In the above-described example, the control of the color gain in the GCA 125 is performed by the subtractor 124 for the other color components E.
This is performed based on the subtraction output obtained by subtracting the _skin color component E _skin from _other , but this is not limited to this example. For example, a divider is provided in place of the subtractor 124, and another color component E _other is converted to a _skin color component E _skin
The color gain in the GCA 125 can be controlled by the division calculation force divided by the above. In this case, a limiter is applied to the divisional calculation force so that a predetermined value is set as a maximum value so that the divisional calculation force works effectively even when the _skin color component _Eskin has a value of 0 or a value near 0. Is preferred.

In addition, E _other1 and E _other2 may be multiplied by predetermined coefficients α and β, respectively. That is, E _other = α × E _other1 + β × E _other2 . The coefficients α and β are set to appropriate values, and CGA1
At 25, a setting is made to increase the gain of the desired color. For example, coefficients p, q, and r are set for each of the three primary color signals R, G, and B so that a desired color is selected, and the coefficients of the color components corresponding to E _other1 and E _other2 are respectively represented by α. And β. By doing so, it is possible to increase the color gain of the desired color more than usual while keeping the skin color gain constant.

By the way, as colors having a special psychological meaning, there are, for example, advanced colors and receding colors in addition to the above-mentioned skin colors. If these colors are arranged among other colors, the advanced colors will be emphasized forward and the receding colors will appear to sink.
Therefore, it is possible to give the image a three-dimensional effect by emphasizing the advanced color and the backward color. Red is typical as the advanced color, and blue is typical as the backward color.

The present invention can be applied not only to a projector and a field double-speed CRT, but also to an eyeglass-type liquid crystal display device. FIG. 27 shows a first example of such a display device. FIGS. 27A and 27B are views of the eyeglass-type liquid crystal display device (indicated by reference numeral 151) mounted on the head of a human, viewed from above and from the side, respectively. This display device 151 is mounted on the head by strings 152 and elastic bands 153 and 154. The optical system including the liquid crystal display is configured inside a box 155 attached to the front.

FIG. 28 schematically shows the optical system formed in the box 155. The color liquid crystal display panel indicated by 162 is driven based on the supplied video signal. Two liquid crystal display panels, each of which can be seen by the left and right eyes, are used. FIG. 28 shows a configuration on one side thereof. 1
Reference numeral 61 denotes a backlight such as a white fluorescent tube, and 163 denotes a diffuser (diffusion plate).

The display light of the liquid crystal display panel 162 is reflected by the half mirror 83 and enters the concave half mirror 165. The image light reflected by the concave half mirror 165 enters the eye 166 through the half mirror 164. Therefore, the image on the liquid crystal display panel 162 is
Can be seen through. Since the concave half mirror 165 is provided, the user can feel as if a larger image is displayed farther than the actual position of the concave half mirror 165. For example, at a distance of about 2 m from the position of the eye 166, it can be felt that the image 167 is virtually displayed with a size of a 52-inch screen.

The two liquid crystal display panels 162 are provided so that they can be viewed separately by the left and right eyes, and the processing is performed on each liquid crystal display panel in the same manner as in the above-described first embodiment. By displaying the left-eye image and the right-eye image respectively, the stereoscopic effect can be enhanced. FIG. 29 shows a signal processing system when such a glasses-type liquid crystal display is used. The three primary color signals processed in the same manner as in the configuration of FIG. 1 are supplied to the liquid crystal drive circuits 171L and 171R. These liquid crystal drive circuits 17
The liquid crystal display panels 172L and 172R are driven by the outputs of 1L and 171R, respectively. Further, even when only one liquid crystal display panel is used, the stereoscopic effect can be enhanced by using the field double speed processing and the shutter as in the second embodiment.

Further, as another example slightly different from the form of the display device 151 shown in FIG.
, And two small displays (not limited to liquid crystal displays) that hang down on the front of the head or are located on the front of the head can be assumed. However, 2
The use of two small displays is the same signal processing process as the signal processing shown in FIG. That is, the liquid crystal display panels 172L and 172R are driven by the liquid crystal drive circuits 171L and 171R.

FIG. 30 shows a second example of the display device. The display device shown in FIG. 30 allows the user to enjoy a realistic virtual image in a relaxed state.
The user holding mechanism 183 holds the user in a sitting state. For example, a user is seated on a chair or a sofa to be kept in a relaxed state.

A connecting portion between the backrest portion and the seat portion of the user holding mechanism 183 has a backrest angle adjusting mechanism 196.
Which is controlled by an angle adjustment mechanism controller 185. The angle adjustment mechanism controller 185 operates according to the operation of the remote controller (remote controller) 195. Therefore, when the user operates the remote control 195, the angle adjustment mechanism controller 185 adjusts the backrest angle according to the operation. By controlling the mechanism 196, the backrest angle adjusting mechanism 196 changes the angle of the backrest portion of the user holding mechanism 183.

Further, a low-frequency signal mechanism 197 is provided, for example, on the backrest of the user holding mechanism 183. The low-frequency vibration mechanism 197 is used for transmitting an acoustic signal supplied through a low-pass filter 198 described later. It is adapted to vibrate accordingly. As a result, the user can experience the acoustic signal.

Further, on the upper part of the backrest of the user holding mechanism 183, for example, a hemispherical system holding mechanism 182 (fixing means) configured to cover the head of the user when the user sits there. Has been fixed. The display device 181 and the speaker 194 are provided inside the system holding mechanism 182.

That is, when the user is held by the user holding mechanism 183, the display device 181 (video providing apparatus) is fixed inside the system holding mechanism 182 such that the user is positioned almost in front of (front of) the user. Have been. Note that the user holding mechanism 183 is configured such that the distance between the user's head and the display device 181 is, for example, 45c.
The user is held so as to be within m.

The display device 181 includes a small display panel 187 (display means) for displaying the video supplied from the video / audio generation device 184, which is constituted by, for example, a liquid crystal display, and the like.
A lens 186 as an enlargement optical system that forms a fusion image by enlarging the image displayed on the image 7, and arranges virtual images observed by the left and right eyes of the user at the same position in space.
Thereby, a virtual image obtained by enlarging the video supplied from the video / audio generation device 184 is provided to the user.

When the user is held by the user holding mechanism 183, the speaker 194 is positioned inside the system holding mechanism 182 so as to be positioned, for example, substantially above the user or on the right and left sides (for example, near the ears). , And emits an audio signal (audio signal) supplied from the video / audio generation device 184. The sound volume can be controlled by the remote controller 195.

The system holding mechanism 182 includes, for example, an ECD
(Electrochromic Display) and the like, which is configured with a variable light transmittance element (hereinafter, referred to as a variable transmittance element), or is configured by incorporating a liquid crystal shutter or the like in a transparent member, A transmittance control mechanism 188 for controlling the transmittance variable element, the liquid crystal shutter, and the like is provided. The transmittance control mechanism 188 controls the transmittance variable element, the liquid crystal shutter, and the like in response to the operation of the remote controller 195, and changes the amount of light incident on the system holding mechanism 182 from the outside. Therefore, the user operates the remote controller 195 to change the transmittance of the system holding mechanism 182, thereby observing an external scene (situation) or preventing the external scene from being seen. And so on.

The video / audio generating device 184 outputs a video to be displayed on the display device 181 and an audio signal to be output from the speaker 194. That is, in the second example, the video / audio generation device 184
Has a VTR (video tape recorder) 189, a TV tuner 190, and a computer 191.
The TR 189 reproduces a video signal and an audio signal recorded on a video tape, the TV tuner 190 receives a video signal and an audio signal of a predetermined television broadcast, and the computer 191 executes a CD-ROM (Compac
The video signal and the audio signal are reproduced from a recording medium such as Disc-Read Only Memory, or the video signal and the audio signal are received from a communication network such as the Internet.

The video signal and the audio signal obtained by the VTR 189, the TV tuner 190 and the computer 191 are supplied to the selector 192.
The selector 192 responds to the operation of the remote controller 195,
One of the VTR 189, the TV tuner 190 and the computer 191 is selected and output. The video signal selected by the selector 192 is supplied to the display device 181, and the audio signal is
The signal is amplified by the amplifier 193 and supplied to the speaker 194 and the low-pass filter 198. Low-pass filter 1
Reference numeral 98 extracts the low frequency component of the acoustic signal and supplies it to the low frequency vibration mechanism 197.

The video signal selected by the selector 192 is
The data is supplied to the display device 181 and displayed on the display panel 187. Display panel 187
Is magnified by the lens 186, and the virtual image formed thereby is provided to the user held by the user holding mechanism 183. As described above, the user can observe a virtual image in a distant place, and as a result, can experience a space (virtual image space) equivalent to or larger than the actual space.

At this time, the user operates the remote control 195 as described above to thereby control the transmittance control mechanism 1.
Via 88, the transmittance of the system retention mechanism 182 covering its head can be varied. For example, when the transmittance is reduced, most of the external light is blocked, so that the user can be immersed in the virtual image space. On the other hand, when the transmittance is increased, the user can view the virtual image while checking the surroundings. Further, for example, when the transmittance is gradually lowered, it is possible to enjoy a feeling of immersing into the virtual image space from the real world.

On the other hand, the audio signal selected by the selector 192 is amplified by the amplifier 193, supplied to the speaker 194, and output. Further, the low frequency component of the acoustic signal amplified by the amplifier 193 is extracted by the low pass filter 198 and supplied to the low frequency signal mechanism 197. Accordingly, the low-frequency signal mechanism 197 vibrates according to the low-frequency component of the audio signal output from the speaker 194, and the user can experience the audio signal. That is, in this case, a powerful viewing environment can be provided to the user. The vibration level can be controlled by the remote controller 195.

Here, an example of the configuration of the optical system of the display device 181 is shown in FIG. FIG. 31 shows a configuration example when the display device 181 is viewed from above the user held by the user holding mechanism 183. In the example of FIG. 31, the display device 181 includes, as an enlargement optical system for forming a virtual image by enlarging an image, a lens 186L (constituting) which is an optical system for the left eye having a different optical axis, Lens 1 as an optical system for the right eye
86R.

That is, the lens 186R or 186L
The display panel 18 for the right or left eye.
Convex lenses having the same characteristics for providing virtual images R or L obtained by enlarging an image displayed on 7R or 187L, respectively, which are arranged on the same plane. That is, the lenses 186R and 186L
The main planes are arranged so as to coincide with each other.

Here, in FIG. 31, O1 or O2
Represents the principal point of the lens 186R or 186L, respectively, and F1 or F2 represents the lens 186R or 1
86L represents the focal point. O represents a middle point between the principal points O1 and O2.

Display panel 187R or 187
L is the center point (for example, the display panel 187)
In the case where R and 187L have a rectangular shape, the intersection of diagonal lines of the rectangle is located on a straight line OF1 or OF2 connecting the midpoint O and the focal point F1 or F2, respectively, and both are on the same plane. It is arranged so as to be located above.

According to the display device 181 configured as described above, the display panel 187R or 1
The image displayed on 87L is the lens 186R or 18
When the light corresponding to the enlarged image is incident on the right eye or the left eye, the virtual image corresponding to the image is observed with the right eye or the left eye. That is, the virtual image R or L formed by the lens 186R or 186L is observed by the right eye or the left eye, respectively.

Further, the virtual image observed by the right eye or the left eye is different from the lens 13186R or 1886 which is a separate optical system.
6L, these virtual images are arranged at the same position in the three-dimensional space. That is, the virtual images observed by the left eye and the right eye of the user are arranged at spatially agreed positions.

FIG. 32 shows a third example of the display device. In the above-described second example, a virtual image of a video output from one video / audio generation device 184 is observed by both the right eye and the left eye of the user, thereby providing a two-dimensional (planar) image.
Although the virtual image is provided, in the third example, the right-eye image generating device 201R or the left-eye image providing device 20R is provided.
The virtual image of the video output by 1L is observed by the right eye or the left eye of the user, thereby providing a stereoscopic virtual image.

Specifically, VTR 201R or 201
In L, a video tape on which a stereoscopic video utilizing binocular parallax is recorded is reproduced, and a video for the right eye or a video for the left eye is output to the selector 205R or 205L, respectively. It should be noted that the VTRs 202R and 202L exchange synchronization signals with each other, whereby each of the VTRs 202R and 202L outputs a video for the right eye or a video for the left eye in a synchronized state. It has been done.

Further, the computer 203R or 203
In L, a right-eye image or a left-eye image by computer graphics for providing a stereoscopic image using binocular parallax is generated, and is output to the selector 205R or 205L, respectively. The computers 203R and 203L are connected to each other by a predetermined communication line such as an Ethernet line, so that the right-eye image and the left-eye image can be synchronized from each other. It is designed to be output in a taken state.

Other Image Generating Devices 204R or 20R
Also in 4L, a right-eye image or a left-eye image forming a stereoscopic image using binocular parallax is generated, and these are output to the selector 205R or 205L in a state where they are synchronized with each other. ing.

At the selector 205R, the VTR 202R,
Computer 203R or other layer generator 204
R is selected, and the selected output, that is, the image for the right eye is displayed on the display panel 18.
7R. The selector 205L is connected to the selector 20L.
5R, VTR202L, computer 2
03L or other image generation device 204L,
The selector 205 selects an output corresponding to the selection, and outputs the selected output, that is, the image for the left eye,
It is supplied to the display panel 187L.

Display panel 187R or 187
The display of L is magnified by the lens 186R or 186L and enters the user's right eye or left eye, respectively. As a result, a virtual image obtained by enlarging the image for the right eye or the left eye is observed with the right eye or the left eye of the user, thereby providing a stereoscopic image using binocular parallax to the user.

In this case, the left eye or the right eye of the user is directed in the direction of the virtual image for the right eye or the left eye, and the focus adjustment also matches the virtual image for the right eye or the left eye. Is done as follows. Therefore, a stereoscopic image can be observed with little feeling of fatigue.

In the third example shown in FIG. 32, lenses 186R and 18
Although 6L is used, a three-dimensional image can be provided as in the case of FIG. 32 by using a concave mirror.

Next, in the second example shown in FIG. 30, the display device 181 is fixed inside the hemispherical system holding mechanism 182 fixed to the user holding mechanism 183. For example, FIG.
As shown in FIG. 3, the user holding mechanism 183 may be fixed to the other end of the arm stand 211 having one end fixed.

As shown in FIG. 34, the arm stand 211 is provided with a columnar hinge portion at some portions thereof, and each hinge portion has a central axis (center of the two cylindrical bottom surfaces). (A straight line passing through).

Therefore, in this case, the user can move the display device 181 to a desired position and view a virtual image.

Although the display device 181 is fixed to the user holding mechanism 183 in the above-described example, the display device 181 is fixed to the user holding mechanism 1.
It is also possible to constitute so that it can be attached to and detached from 83. Then, in this case, the removed display device 181
For example, as shown in FIG. 35A, it is used by being fixed to a rod-shaped stand, or as shown in FIG. 35B,
It is possible to use it by fixing it to the other end of an arm stand, one end of which is fixed to a desk or the like with a fixing bracket or the like.

Further, the user holding mechanism 183 can vibrate or tilt, for example, up, down, left, right, front and back, in conjunction with the virtual image to be viewed by the user. For example, when the user holding mechanism 183 is moved in conjunction with an image of the sky, it is possible to give the user a feeling as if he / she is actually on an aircraft.

In this embodiment, the HUD (Head U
p Display). In the HUD, an image displayed on a display panel is enlarged through a lens, the enlarged image is reflected by a half mirror, and a virtual image is formed by a user viewing the reflected light. I have. In addition, the half mirror is configured to transmit external light, so that the user can view the surrounding scenery (situation) as external light passing through the half mirror.
Can also be seen with the virtual image.

Here, in a modified example of the present invention, the sense of front and rear is detected by using a luminance signal or a three primary color signal.
The depth information is controlled (modulated) instead of the horizontal position according to the detection result. For example, a plurality of liquid crystal display panels are stacked, the foreground is displayed on the front liquid crystal display panel, and the background is displayed on the rear liquid crystal display panel.
A display that can display depth information other than the multilayer liquid crystal display panel may be used.

Further, even in the case where the number of the liquid crystal display panels is one, the stereoscopic effect can be enhanced by using the field double speed processing and the shutter as in the second and third embodiments.

[0179]

According to the present invention, by combining all or some of the factors that can provide a three-dimensional effect, two-dimensional effects can be obtained.
It is possible to express a three-dimensional effect even in a two-dimensional video signal. In addition to increasing the three-dimensional effect of a moving object utilizing the effect of the conventional Pulfrich pendulum, it is possible to express the three-dimensional effect even in a still image.

According to the present invention, a three-dimensional image can be represented by a relatively simple circuit by real-time processing for input of almost two-dimensional image signals. In addition, since a clue of a single eye and a clue of both eyes (a small amount of left and right parallax) are used, it is possible to express a three-dimensional effect without a natural fatigue.

[Brief description of the drawings]

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

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

FIG. 3 is a schematic diagram for explaining field doubling applied to the present invention.

FIG. 4 is a block diagram of a third embodiment of the present invention.

FIG. 5 is a block diagram showing a first example of a configuration for detecting a sense of front and rear applied to the present invention.

FIG. 6 is a block diagram showing a second example of a configuration for detecting a sense of front and rear applied to the present invention.

FIG. 7 is a block diagram showing a third example of a configuration for detecting a sense of front and rear applied to the present invention.

FIG. 8 is a detailed block diagram of an example of a front-rear sense circuit applied to the present invention.

FIG. 9 is a circuit diagram of an example of a front-rear sense circuit applied to the present invention.

FIG. 10 is a schematic diagram for explaining a front-back feeling operation applied to the present invention.

FIG. 11 is a schematic diagram for explaining an operation of a sense of front and rear applied to the present invention.

FIG. 12 is a block diagram showing a first example of a configuration for detecting a sense of front and rear applied to the present invention.

FIG. 13 is a block diagram showing a second example of a configuration for detecting a sense of front and rear applied to the present invention.

FIG. 14 is a block diagram showing a third example of a configuration for detecting a sense of front and rear applied to the present invention.

FIG. 15 is a circuit diagram of an example of a glossy circuit applied to the present invention.

FIG. 16 is a circuit diagram of another example of the glossy circuit applied to the present invention.

FIG. 17 is a block diagram of a first example of a glossy circuit applied to the present invention.

FIG. 18 is a block diagram of a second example of a glossy circuit applied to the present invention.

FIG. 19 is a block diagram of a third example of a glossy circuit applied to the present invention.

FIG. 20 is a connection diagram for explaining an ABL circuit applied to the present invention.

FIG. 21 is a block diagram showing an example of a V aperture circuit applied to the present invention.

FIG. 22 is a block diagram of an example of a coring sharpness circuit applied to the present invention.

FIG. 23 is a block diagram for explaining a color emphasizing circuit applied to the present invention.

FIG. 24 shows an example of a region where the gain of GCA is enhanced by x
FIG. 3 is a diagram represented on a -y chromaticity diagram.

FIG. 25 is a schematic diagram for describing a method of generating a voltage E _skin and a voltage E _other .

FIG. 26 is a schematic diagram for describing a method of generating a voltage E _skin and a voltage E _other .

FIG. 27 is a first example of a glasses-type display device to which the present invention is applied.

FIG. 28 is a schematic diagram used for description for optical description of a glasses-type display device.

FIG. 29 is a block diagram of a modification to which the present invention is applied.

FIG. 30 is a second example of a display device to which the invention is applied.

FIG. 31 is a configuration example of an optical system of a display device.

FIG. 32 is a third example of a display device to which the present invention is applied.

FIG. 33 is a fourth example of a display device to which the present invention is applied.

FIG. 34 is a fifth example of a display device to which the present invention is applied.

FIG. 35 is a sixth example of a display device to which the present invention is applied.

FIG. 36 is a schematic diagram for explaining a method of enhancing a three-dimensional effect by parallax information.

FIG. 37 is a schematic diagram for explaining Pulfrich's law as an example of a method of enhancing a three-dimensional effect by disparity information.

[Explanation of symbols]

12 ... Y / C separation circuit, 13 ... color demodulation circuit, 1
4: Front / back feeling / depth feeling circuit, 15: Gloss / contrast emphasis circuit, 16: V aperture control / coring sharpness circuit, 17: Color emphasis circuit, 18
... Matrix circuit, 19 ... Preamplifier, 20
..CRT drive circuit, 21 ... CRT, 22L,
25L ... horizontal polarization filter, 22R, 25R ...
Vertical polarizing filter, 23 ... Screen, 24 ...
glasses

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuhiko Fujiwara Sony Corporation, 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo

Claims (9)

[Claims] An image display device, to which an image signal is input and which displays an image on a display device, uses edge information or focus information of the image signal,
In accordance with the amplitude level and the frequency level of the change in the video signal, the position of the image is moved in the horizontal direction to add a left-right parallax; Depth sense emphasizing means, glossy means for detecting a glossy portion of the image and enhancing the contrast of one eye and / or both eyes in the glossy portion, and an edge having a relatively large amplitude and a high frequency component A coring sharpness means for giving sharpness only to the image; a vertical aperture control means for raising a frequency characteristic in the middle and lower frequency ranges at a vertical change point of the image; a skin color as a memory color, and a color other than the skin color Color emphasis means for enhancing color contrast, and using two or more of the above means to enhance a three-dimensional effect. The video display device according to symptoms. 2. The video signal according to claim 1, wherein the edge information or focus information of the video signal is a maximum value of R, G, B levels or R, G,
A video display device according to a maximum value of a change in B. 3. The image display device according to claim 1, wherein the three-dimensional effect enhancing means is arranged at an arbitrary position without fixing the center fusion plane at the back. 4. The image according to claim 1, wherein the front-back sense emphasis means changes an added amount of the left-right parallax based on the edge information, and changes the added amount of the left-right parallax. Display device. 5. The stereoscopic effect enhancer according to claim 1, wherein the three-dimensional effect enhancer is arranged at an arbitrary position without fixing the center fusional surface at the back, and the front-rear sense enhancer is configured to detect the edge information or the edge information. An image display device, wherein the amount of left-right parallax added based on focus information is changed to change the amount of left-right parallax added. 6. The video display device according to claim 1, wherein a front and rear area is estimated from the edge information or the focus information, and a left-right parallax is added to each estimated area. 7. The vertical aperture control according to claim 1, wherein the intensity and characteristics of the effect of the vertical aperture control are changed from a rising portion and a falling portion, and a white side and a black side of the video signal. A video display device characterized in that the video display device comprises vertical shade enhancement. 8. The video display device according to claim 1, wherein the front / rear sense emphasis means changes depth information as stereoscopic information instead of giving the left / right parallax to the video signal. 9. A video display method in which a video signal is input and a video is displayed on a display device, wherein edge information or focus information of the video signal is used,
According to the amplitude level and frequency level of the change of the video signal, the position of the image is moved in the horizontal direction to add a left-right parallax, and a method of enhancing the sense of front and rear is provided. A depth sense emphasizing method, a glossiness emphasis method for detecting a glossy portion of the image, and enhancing contrast of one eye and / or both eyes in the glossy portion, and an edge having a relatively large amplitude and a high frequency component A coring sharpness method that gives sharpness only to the image, a vertical aperture control method that raises the frequency characteristics of the low and middle frequencies at the vertical change point of the image, a skin color that is a memory color, and The color enhancement method that enhances color contrast, and the fact that two or more of the above methods are used to enhance the stereoscopic effect. Image display method for the butterflies.