JPH0888869A - Three-dimensional display device - Google Patents

Abstract

PURPOSE: To easily three-dimensionally display any still and moving pictures by normal video software. CONSTITUTION: This device is provided with a switching signal generation means 5 for generating field switching signals for switching an odd-numbered field and an even-numbered field corresponding to source picture signals, a picture delay means 4 for inputting the source picture signals and outputting delayed picture signals for which the source picture signals are delayed for prescribed time, display position adjustment means 15-18 for adjusting the position of the synchronizing signals of either source picture signals or delayed picture signals, a field switching means 10 for switching the data of either source picture signals or delayed picture signals for which the position of the synchronizing signals is adjusted and the other data for which the position of the synchronizing signals is not adjusted based on the field switching signals for the respective fields and generating three-dimensional picture signals and three-dimensional display means 20 and 200 for switching three-dimensional pictures based on the field switching signals and alternately switching and displaying the pictures for a right eye and the pictures for a left eye for the respective fields.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to so-called three-dimensional display technology, and more particularly to a three-dimensional display device which switches and displays images reaching the left and right eyes for each field by a liquid crystal shutter or the like.

[0002]

2. Description of the Related Art In a conventional stereoscopic display device, an image for the right eye and an image for the left eye are generated by separate cameras, and they are combined and reproduced.

The situation will be specifically described. First, at the time of recording, the image creator shoots the subject with a dedicated camera for creating a stereoscopic image. Since a camera for capturing a stereoscopic image (hereinafter referred to as “stereoscopic camera”) captures an object with two lenses that are as wide as human eyes, the captured left and right image signals include parallax. This is recorded separately on the VTR or the like.

At the time of reproduction, the image signals for both eyes are read out, and the data for the right eye and the data for the left eye are alternately displayed for each field. With stereoscopic display glasses (for example, a device that alternately supplies images for the right eye and data for the left eye for each field to the left and right eyes with an image on a stereoscopic monitor), An observer who observes an image recognizes an image captured by the right-eye lens of the stereoscopic camera with his right eye and an image captured by the left-eye lens of the stereoscopic camera with his left eye. The image projected on each of the left and right eyes contains some parallax, so that the cerebrum of the observer creates an illusion when trying to reconstruct the original image. Therefore, the observer recognizes the subject as if the subject were present there (hereinafter, an image having a virtual sense of distance obtained by stereoscopic display is referred to as a "virtual image").

[0005]

However, the above-mentioned conventional stereoscopic display device has a problem that the cost for photographing is high.

Specifically, in order to capture the image for stereoscopic display as described above, a dedicated camera for stereoscopic image capturing is required. The camera for 3D image capture has the image quality of the left and right image signals,
Fine adjustment of parallax, etc., to provide image signals of the same quality on the left and right.
For this reason, the stereoscopic camera is more expensive than a normal camera.

Further, these stereoscopic display devices have no effect of stereoscopic display when an image signal which is not produced for stereoscopic display is input, and a normal image display which is not stereoscopic display (hereinafter referred to as a flat image display). It was just a display).

That is, since the stereoscopic camera has a very special purpose, the number of video software shot by the stereoscopic camera is very small. With ordinary video software, even if an image is displayed using a conventional stereoscopic display device, it is only possible to display a planar display that does not give any stereoscopic effect.

In view of the above problems, an object of the present invention is to provide a stereoscopic display device in which ordinary video software can easily enjoy a stereoscopic display effect.

[0010]

In order to achieve the above object, the invention according to claim 1 is a switching signal for generating a field switching signal for switching between an odd field and an even field in correspondence with an original image signal. The position of the generation means, the image delay means for inputting the original image signal and outputting the delayed image signal obtained by delaying the original image signal for a predetermined time, and the position of the synchronizing signal of either the original image signal or the delayed image signal are adjusted. The display position adjusting means, the data of either one of the original image signal or the delayed image signal in which the position of the synchronizing signal is adjusted, and the other data of which the position of the synchronizing signal is not adjusted are provided for each field based on the field switching signal. And a field switching means for generating a stereoscopic image signal by switching to an image for the right eye and an image for the left eye based on the stereoscopic image signal and the field switching signal. And stereoscopic display means for displaying is switched alternately every field, configured with a.

According to a second aspect of the present invention, there is provided switching signal generating means for generating a field switching signal for switching between the odd field and the even field corresponding to the original image signal, and the display position changing means for inputting the original image signal. And an image delay means for outputting a delayed image signal obtained by delaying the original image signal by a predetermined time based on the control of 1. and a read start address for each horizontal line of the image delay means are changed from the start address at the time of writing and read. Display position changing means for adjusting the display position of the delayed image signal, field switching means for generating a stereoscopic image signal by switching the original image signal and the delayed image signal for each field based on the field switching signal, and the stereoscopic image. Stereoscopic display in which an image for the right eye and an image for the left eye are alternately switched and displayed for each field based on a signal and a field switching signal. Configured to include a stage, a.

According to a third aspect of the present invention, in the stereoscopic display device according to the first or second aspect, a moving image for detecting the presence or absence of a moving image component in the original image based on the original image signal and the delayed image signal. The display position adjusting unit has a detecting unit and selects an image signal whose display position is to be adjusted in accordance with the moving direction of the moving image indicated by the moving image component.

According to a fourth aspect of the present invention, in the stereoscopic display device according to the first to third aspects, the image delay means is composed of a video memory, and gives a delay amount in frame units to the original image signal.

[0014]

According to the invention described in claim 1, the switching signal generating means inputs the original image signal and generates a field switching signal for switching between the odd field and the even field in correspondence with the original image signal. .

The image delay means inputs the original image signal and outputs a delayed image signal obtained by delaying the original image signal by a predetermined time. The display position adjusting means adjusts the position of the synchronizing signal of either the original image signal or the delayed image signal.

The field switching means outputs, based on the field switching signal, one of the original image signal and the delayed image signal, the data of which the position of the synchronizing signal is adjusted, and the other data of which the position of the synchronizing signal is not adjusted. Switch for each field. The result is a stereoscopic image signal.

Since the stereoscopic display means alternately displays the image for the right eye and the image for the left eye for each field based on the field switching signal, the stereoscopic display means displays the image even if the original image is a still image. The observer recognizes an image including parallax with each of the left and right eyes to obtain a stereoscopic effect.

According to the second aspect of the invention, the switching signal generating means inputs the original image signal and generates a field switching signal for switching between the odd field and the even field in correspondence with the original image signal. .

The image delay means inputs the original image signal and outputs a delayed image signal obtained by delaying the original image signal by a predetermined time under the control of the display position changing means. The display position changing means adjusts the display position of the delayed image signal by changing the read start address of each horizontal line of the image delay means from the start address at the time of writing and reading.

The field switching means switches the original image signal and the delayed image signal for each field based on the field switching signal to generate a stereoscopic image signal. Then, the stereoscopic display unit alternately displays the image for the right eye and the image for the left eye for each field based on the field switching signal, and thus displays the image, even if the original image is a still image. Each eye recognizes an image containing parallax, and obtains a stereoscopic effect.

According to the third aspect of the present invention, the moving image detecting means detects a moving image component in the original image based on the original image signal and the delayed image signal by using a method such as ordinary image processing.

Since the display position adjusting means selects the image signal whose display position is to be adjusted in accordance with the direction of movement of the moving image indicated by the moving image component, the display position is changed according to the movement of the moving image. The image signal to be switched is switched.

Therefore, the stereoscopic effect of the still image by the display position adjusting means is changed according to the difference between the case where the stereoscopic effect due to the delay of the moving image is obtained in front of the screen and the case where the stereoscopic effect is obtained behind the screen. be able to.

According to the fourth aspect of the invention, since the image delay means is composed of the frame memory, the delayed image becomes one complete image and the image of the previous frame and the current image. It is clearly recognized that the moving image has moved. Therefore, a clear on-screen distance is generated between both images, and a stereoscopic image based on this parallax is displayed.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the stereoscopic display device of the present invention will be described with reference to the drawings. (I) Description of Principle of the Present Invention The principle of stereoscopic display of the present invention will be described with reference to FIG.

In order for humans to perceive a stereoscopic effect, there must be a parallax between the image recognized by the left eye and the image recognized by the right eye. Two images having this parallax cannot be obtained from an image of a normal stationary subject.

However, if the display position of the image displayed on the right eye and the display position of the image displayed on the left eye can be slightly displaced, it is equivalent to that the images of both eyes have parallax. It can be expected that the cerebrum of the human observing this image creates an illusion and the observer feels a stereoscopic effect.

In FIG. 1, an image of "person" exists in the background. As shown in FIG. 1, an adjusted image G ₂ obtained by changing the display position of the subject to the input original image G ₁ is obtained. Adjustment image G ₂
Indicates that the display position of the subject is displaced from the display position of the original image by a predetermined amount. Image having two parallaxes, adjusted image G ₂
A stereoscopic image G ₀ can be generated by combining the original image G ₁ with the original image G ₁ . The stereoscopic image G ₀ is obtained by alternately displaying the original image G ₁ and the adjusted image G ₂ for each field period based on the field synchronization signal of the video signal.

In order for an observer to see a stereoscopic display, an electronic shutter is provided in front of each of the observers, and a stereoscopic image G is alternately provided to the right eye and the left eye according to the field synchronization signal.
_Makes the image of ₀ transparent. As a result, the observer recognizes the original image G ₁ with one of the right eye and the left eye, and recognizes the adjusted image G ₂ with the other eye. Since the display position of the subject between both images has a parallax, the observer feels a stereoscopic effect.

In order to obtain the adjusted image G ₂ , there are a method of changing the display position of the entire screen and a method of changing only the moving image. In the present invention, both methods are used together to perform stereoscopic display corresponding to both the still image portion and the moving image portion.

I) Method of stereoscopically displaying still image portion In order to create a stereoscopic effect on the still image portion of the original image, the display position of the entire original image G ₁ is slightly moved.

For this purpose, as described in claim 1, the position of the synchronizing signal is slightly advanced from the position of the original image, and the display position of the image is relatively moved. Further, when reading data from the image memory, the read address in the memory area in which the original image is written is slightly shifted.

As a result, the read image signal has moved from the display position of the original image signal. A stereoscopic effect is created by individually switching between the image whose display position has been changed and the original image and supplying them to each eye with the electronic shutter.

For example, in FIG. 1, let us consider a case where the electronic shutter S _R for the right eye supplies the original image G ₁ to the right eye and the electronic shutter S _L for the left eye supplies the adjusted image G ₂ to the left eye. As can be seen from FIG. 1, the line of sight indicated by the solid line looking at the original image with the right eye and the line of sight indicated by the broken line looking at the adjusted image with the left eye intersect at P ₂ in front of the screen. Therefore, the observer
It feels as if the image of a "person" came "out of the way" from the actual display screen position P ₀ to near point P ₂ . That is,
A virtual image is recognized in front of the screen.

On the contrary, the electronic shutter S _R for the right eye
Supplies the adjusted image G ₂ to the right eye and the electronic shutter S _L for the left eye supplies the original image G ₁ to the left eye, the sight line of the right eye and the sight line of the left eye intersect at P ₁ at the rear of the screen. Therefore, the observer feels as if the image of “person” is “retracted” from the position P ₀ on the actual display screen to the vicinity of point P ₁ . That is, the virtual image is observed moving backward in the screen.

The amount of stereoscopic effect changes according to the amount of displacement between the original image and the adjusted image. When the display position of the entire image is moved as described above, it can be predicted that all portions having some outline in the original image will create a stereoscopic effect. In other words, the entire image is'embossed 'forward or'retracted' behind the actual display screen.

Ii) Creation of a stereoscopic effect on a moving image When a moving image component whose display position changes every moment is included in the original image G ₁ , an image at a certain time and an image at a time slightly delayed from that time are The display position of the moving image has changed. This is used to create a stereoscopic effect on a moving image.

For example, when the "person" in FIG. 1 is "running" on the screen, the display position of the "person" changes moment by moment. Therefore, the original image G ₁ having the moving image component is delayed in the image memory to obtain the adjusted image G _{2 in} which the display position of the moving image is changed. The relationship between the two images is the same as the relationship between the original image G ₁ and the adjusted image G ₂ in the still image. Therefore,
If both images are displayed separately on the left and right eyes at the same time, the observer feels a stereoscopic effect as if the “person” is “embossed” or “retracted”. (II) First Example A first example is a stereoscopic display device to which the inventions of claims 1 and 4 are applied.

I) Description of Configuration FIG. 2 shows a block diagram of the stereoscopic display device of the first embodiment.
As shown in FIG. 2, the stereoscopic display device according to the present embodiment includes a stereoscopic reproduction device 100 that generates a stereoscopic image, a monitor 20 that displays the stereoscopic image, and a liquid crystal driver device that a user wears to observe a stereoscopic image. And 200.

The stereoscopic reproducing apparatus 100 generates a stereoscopic image signal V _O from an original image signal V _{1 obtained} by converting a normal original image G ₁ for flat display into a video signal. The sync signal extracting circuit 1 removes the sync signal component from the original image signal V ₁ and supplies only the video signal component to the A / D converter 3.

The A / D converter 3 A / D converts the original image signal V _I input from the input terminal 2. The frame memory 4 stores one frame of digital image data.
The frame memory 4 operates in a FIFO format, and reads image data at a read timing controlled by a memory controller 7, which will be described later, one frame after storage, that is, after a delay time of 1/30 [sec].

The memory controller 7 manages writing timing and reading timing of the frame memory 4. The sync separation circuit 5 separates the sync signal from the original image signal V ₁ and outputs a horizontal sync frequency H and a field switching signal F for switching between the odd field and the even field. The sync separation circuit 5 is composed of a known sync separation circuit, separates the sync signal of the original image signal V _I , and supplies a horizontal sync signal H (for example, f _H = 15.734 [kHz]) to the PLL circuit 6. To do. Also, it outputs a field switching signal F (see FIG. 3) in which'H 'and'L' are inverted for each field based on the vertical synchronization signal.

The PLL circuit 6 synchronizes the original image signal V ₁ with the system by the crystal oscillator 13 (for example, 14.3 [MHz]), and outputs the sampling signal SC for digitizing the original image signal V _1. Output. The frequency of the sampling signal SC generated by the PLL circuit 6 is a sampling frequency (> = 4) sufficient for digitizing the original image signal V _1.
f _SC ) is selected and has a value of, for example, 14.3 [MHz].

The synchronizing signal generating circuit 15 generates a horizontal synchronizing signal which is synchronized with the horizontal synchronizing signal of the original image signal V ₁ inputted on the basis of the sampling signal SC. Delay circuit 16
Delays the horizontal synchronizing signal generated by the synchronizing signal generating circuit 15 by a predetermined amount.

The D / A converter 8 converts the delayed original image data into an analog signal, and the D / A converter 9 converts the undelayed original image signal into an analog signal. Adder 17
Adds the delayed horizontal synchronization signal to the D / A converted original image signal to generate an adjusted image signal V ₂ .

The adder 18 adds the horizontal synchronizing signal having no delay to the frame-delayed image signal and outputs the delayed image signal V
Generates ₃ . The switch 10 is composed of an analog switch, a multiplexer, or the like, and selects, for example, the adjusted image signal V ₂ when the field switching signal F is “1” and the delayed image signal V ₃ when the field switching signal F is “0”. It is selected and output as the stereoscopic image signal V ₀ .

The output terminal 14 supplies the stereoscopic image signal V _O to the monitor 20. The monitor 20 displays the stereoscopic image signal V _O. The burst discontinuity detection circuit 11 uses a color subcarrier (for example, f _SC = 3.58) due to field switching.
[MHz]) inversion is detected.

The color shift circuit 12 phase-shifts the color subcarrier (for example, 140 [ns]) when the color subcarrier is inverted from the normal phase state according to the output of the burst discontinuity detection circuit 11. Let it return to the normal state.

Further, the liquid crystal driver device 200 includes the stereoscopic spectacles 21 worn by the user, in which the left and right liquid crystal panels can be independently driven, and either the left or right liquid crystal by the field switching signal F supplied from the stereoscopic reproduction device 100. A switch 22 for selecting the panel and an appropriate modulation pulse for driving the liquid crystal (for example, 300 [Hz], -5 [V] to +
An oscillator 23 that oscillates a 5 [V] square pulse, and drivers 24 and 25 that drive the liquid crystal panel are provided.

Instead of using the liquid crystal driver 200, the monitor 20 may be replaced with a monitor dedicated to stereoscopic display. At this time, the monitor dedicated to stereoscopic display uses the field switching signal to separately display either the delayed image or the adjusted image without delay for the left eye and the right eye of the observer.

In this embodiment, the NTSC system is assumed as the television system of the video signal, but it can be applied to other television systems (PAL system, SECAM system, etc.). In that case, the frequency of the crystal oscillation and the shift amount of the color shift circuit may be adjusted according to each television standard.

The synchronization signal cut-out circuit 1 is not essential, and the memory controller 7 or the like may be prohibited from writing the synchronization signal into the frame memory. In this way, the same effect as removing the synchronization signal can be obtained.

Further, in the configuration of FIG. 2, the horizontal synchronizing signal is generated as an analog signal and is added in an analog manner. However, digital subtraction is performed before the D / A converters 8 and 9 to obtain the horizontal synchronizing signal. May be created. At this time, instead of using the delay circuit 16, the timing for performing the subtraction of the synchronization signal generation is delayed.

Although the delay circuit 16 is inserted between the synchronizing signal generating circuit 15 and the adder 17, the synchronizing signal generating circuit 15
May be inserted between the adder 18 and the adder 18. In this case, the recognized position of the finally obtained virtual image changes.

As the field switching signal, a field identification signal obtained by field identification which is a known technique may be used. This field identification signal is obtained by counting the equivalent pulses existing during the vertical blanking period of the original image signal to determine whether the field having the vertical blanking is an odd field or an even field. Is. This signal can be obtained from a known sync separation circuit or the like.

Further, as a substitute for other field switching signals, additional information such as Phillips code in the video disc can be used. This Philips code has different reference information for each field, and by referring to this code, it can be determined whether it is an odd field or an even field. When this code is used, a code decoder or the like plays the role of switching signal generating means.

Hereinafter, for convenience of description, the adjusted image signal V
The screen display on the monitor 20 by _{2 is referred} to as G ₂ , and the screen display on the monitor 20 by the delayed image signal V _{3 is referred} to as G ₃ . ii) Description of Operation Next, the operation will be described with reference to FIGS. 3 and 4.

FIG. 3 shows the image contents of each point in the first embodiment shown in FIG. 2 in field units. In FIG. 3, the same alphabet (A, B, C ...) Shows the field period and corresponds to the field images belonging to the same frame. Odd numbered subscripts indicate odd fields and even numbered subscripts indicate even fields. For example,
One frame, one image is completed by A1 and A2,
A1 is an image of the odd field, and A2 is an image of the even field.

In FIG. 2, the original image signal V ₁ input from the input terminal 2 has its sync signal component removed by the sync signal extracting circuit 1 and converted into a digital signal by the A / D converter 3. The frame memory 4 writes the digitized original image signal V ₁ and, under the control of the memory controller 7, reads it according to the storage order after one frame period. The D / A converter 8 converts the delayed image data into an analog video signal and supplies it to the adder 18.

The synchronizing signal generating circuit 15 generates a horizontal synchronizing signal based on the sampling frequency at a timing substantially in accordance with the original image signal V ₁ . Therefore, the adder 18 adds the horizontal synchronizing signal synchronized with the horizontal synchronizing signal of the original image signal V ₁ to the delayed image signal. As described above, the delayed image signal V ₃ delayed by one frame period is supplied to the switch 10 (see FIG. 3).

On the other hand, the D / A converter 9 is the A / D converter 3
The image data without delay from is converted into an analog video signal. The delay circuit 16 gives the horizontal synchronizing signal supplied from the synchronizing signal generating circuit 15 a delay sufficiently smaller than the vertical synchronizing period. The adder 17 adds the horizontal synchronization signal delayed by a slight amount to the image signal without delay to obtain the adjusted image signal V
_Set to ₂ . Therefore, the adjusted image signal V ₂ and the original image signal V ₂
There is no field-wise delay between ₁ and ₁ (see FIG. 3), but the position of the horizontal sync signal is different (see FIG. 4).
reference). This is shown in FIG.

As shown in FIG. 4, the horizontal synchronizing signal of the adjusted image signal V ₂ is given a delay amount α with respect to the horizontal synchronizing signal of the original image signal V ₁ . Switch 10, the field switch signal F logic for each field is reversed, the adjusted image signal V ₂ and the delayed image signals V ₃ and multiplex to output to a three-dimensional image signal V _O (see FIG. 3). This stereoscopic image signal V _O has a time of 1/60 for each field.
[Sec] It becomes a signal in which the preceding and succeeding images are repeated.

On the other hand, the field switching signal F is also supplied to the liquid crystal driver device 200 worn by the observer. A drive pulse signal is supplied from the oscillator 23 to the switch 22. The drive pulse signal selected by the switch 22 is supplied to the left-eye liquid crystal panel or the right-eye liquid crystal panel of the stereoscopic display glasses 21 via the driver 24 or 25. Therefore, depending on the output of the field switching signal F, the right-eye or left-eye liquid crystal panel is alternately driven for each field. When a drive pulse signal is supplied to the liquid crystal panel, the liquid crystal molecules are oriented in a certain direction and lose the optical rotatory power so that light is transmitted. Further, when the drive pulse signal is not applied, since it has optical rotatory power, normal light rays do not pass through. That is, the stereoscopic display glasses 21 function as shutters that open and close for each field.

Since the shutters are opened and closed alternately by the field switching signal F synchronized with the stereoscopic image displayed on the monitor 20, the observer wearing the stereoscopic display device 21 displays an image of an odd field in the right eye. Only one of the even fields is recognized, and only the image of the other field is recognized by the left eye.

For example, when the field switching signal F is at the H level, the liquid crystal panel on the left side of the stereoscopic display device 21 is in the transmissive state, and when the field switching signal F is at the L level, the liquid crystal panel on the right side is in the transmissive state. Field (A1, B
, C1 is recognized, and only the even fields (Z2, A2, B2, C2, ...) Are recognized in the right eye.

The adjusted image V ₂ displayed by the above operation
A stereoscopic effect corresponding to the parallax between the image and the delayed image V ₃ can be obtained. More specifically, when the original image G ₁ includes a moving image, the display position of the moving image portion is changed between the image data passing through the frame memory 4 and the image data not passing through the frame memory 4. become. The observer recognizes the virtual image at a distance corresponding to the moving speed of the moving image portion.

[0067] Also, in the case still image portion or a moving image component in the original image G ₁ other than moving image of the original image G ₁ is not at all exist, the three-dimensional effect corresponding to the amount of delay of the delay circuit 16 is obtained. That is, the starting point of image display on the original image monitor 20 is based on the falling time of the horizontal synchronizing signal. For this reason, the fact that the position of the horizontal synchronizing signal changes more than usual means that the display position of the image is displaced in the horizontal direction from the image where the horizontal synchronizing signal is not changed.

In FIG. 4, the horizontal synchronizing signal of the adjusted image signal V ₂ is delayed from the original image signal V ₁ . Therefore, the time t ₂ from the fall of the horizontal synchronizing signal of the adjusted image signal V ₂ to the image signal portion (hatched portion) is the original image signal V ₁
Is shorter than t ₁ . Therefore, the position displayed on the monitor 20 is displaced to the left of the monitor screen from the position displayed corresponding to the original original image signal V ₁ . Since a parallax exists between an image whose display position is displaced and an image whose display position is not displaced, a stereoscopic effect can be obtained according to the above-described principle.

When the delayed image is displayed in the left eye in the odd field and the adjusted image is displayed in the right eye in the even field depending on the polarities of the switches 10 and 22, the lines of sight of both eyes cross each other. The person recognizes the virtual image in front of the actual monitor screen. In this way, in order to recognize the virtual image at the back of the monitor screen, the polarity of either one of the switches 10 and 22 may be reversed.

When it is desired to change the "depth feeling" of the virtual image (the relative distance between the actual display screen and the intersection of the line of sight), the delay amount of the delay circuit 16 may be changed. iii) Effects According to the first embodiment described above, a stereoscopic image signal can be generated from a normal flat display image signal. Also, a stereoscopic effect can be obtained for both the moving image portion and the still image portion. (III) Second Embodiment A second embodiment of the present invention is a stereoscopic display device to which the inventions of claims 2 and 4 are applied. In this embodiment, the first
Instead of delaying the horizontal synchronizing signal as in the embodiment, the read address from the frame memory is changed to obtain the same effect as that of the first embodiment.

I) Description of Configuration FIG. 5 shows the configuration of the stereoscopic display device of the second embodiment. As shown in FIG. 5, the stereoscopic display device 101 of the second embodiment is similar to that shown in FIG.
In the stereoscopic display device 100 of the first embodiment shown in FIG. 3, the delay circuit 16 and the memory controller 7 interposed between the synchronizing signal generating circuit 15 and the adder 17 are replaced with the stored read address of the image memory. A changeable memory controller 7'is provided. The memory controller 7 ′ also inputs the field switching signal F.

Since the horizontal synchronizing signal is not delayed by the delay circuit 16, the signal supplied to the switch 10 through the adding circuit 17 is the original image signal V ₁ with only a small circuit delay added. (and V ₁ '.) substantially equal to the signal and the signal V ₁ is.

The other constituent elements are the same as those of the first embodiment, and the description thereof will be omitted. ii) Description of Operation Next, the operation of the second embodiment will be described with reference to the flowchart of FIG.

In the second embodiment, the original image signal V ₁ is stored in the frame memory 4 in the same procedure as in the first embodiment. However, the method of reading data from the frame memory 4 by the memory controller 7'is different.

In step S1, the memory controller 7'reads the field switching signal F and determines the signal logic (step S2). When the input image signal is an odd field (YES), the switch 10 selects the original image signal V ₁ 'as can be seen from FIG.
The memory controller 7'does not operate.

If the input image is not an odd field (NO), that is, if it is an even field, the switch 10 selects the delayed image V _3, and thus the operation is started.
In step S3, a write address for newly writing an image is set to a normal initial value (for example, address A
Write in order from ₁ . ).

In step S4, the operation of reading the data stored for one frame period before is started. Here, the memory controller 7'adds the offset address a without making the read start address the same address A ₁ . By this processing, the data group to be read has moved relatively in the horizontal line direction.

In step S5, the memory content is read from the read start address based on the set value. In step S6, the image data currently input via the A / D converter 3 is written in the memory from the write start address based on the set value.

In step S7, a predetermined number (that is, 1
It is checked whether or not reading and writing of (field image data) has been completed. If the reading and writing of image data is still continuing (NO), the reading and writing operations of steps S5 and S6 are continued, and if the reading and writing of image data is completed (YES), the frame concerned. The operation in is ended.

FIG. 7 shows an example of the delayed image signal V ₃ read by the operation of FIG. As shown in the upper part of FIG. 7, in the original image signal V _{1, the} area starting from the burst signal is the address A.
_It is written in order from ₁ .

In reading the image data, when the entire image is shifted to the left and displayed, the memory controller 7'reads the image data from a higher address. For example, in the example shown in the middle part of FIG. 7, the delayed image signal V to be read is
_{At 3} , data is read from the address A ₃ .

When the image data is read in this way, the address A ₃ to be displayed at the position of the third pixel is displayed.
Since the data of 3 is displayed at the position of the first pixel, the displayed delayed image G ₃ is shifted to the left by 3 pixels as a whole.

The entire image is shifted to the right and displayed.
Memory controller 7 ', the
Image data is read from the memory. For example, in the lower part of FIG.
In the example, the delayed image signal V to be read₃Is the address A
₂₆₂Read from, A₂₆₂, A ₂₆₃, A₁, A₂,…What
And the reading progresses. Where A₂₆₂, A₂₆₃Is A₁Than
Substitute data because there is no data at a lower address
Has been read as.

If A ₁ is read out three times in succession instead of the addresses A ₂₆₂ and A ₂₆₃ , image data of the same contents with adjacent display positions are displayed at the edge of the display screen. It is more preferable because the feeling of strangeness is eliminated.

When such image data is read out, the displayed delayed image G ₃ is shifted to the right by 2 pixels as a whole. Therefore, the second embodiment has the same effect as that of the first embodiment in which the delay circuit 16 is interposed between the synchronization signal generating circuit 15 and the adder 18.

Iii) Effects According to the second embodiment, stereoscopic display can be performed on both still images and moving images without providing the delay circuit as in the first embodiment.

In particular, in this embodiment, since the read address can be arbitrarily changed by setting the memory controller 7 ', the stereoscopic effect can be changed according to the preference of the observer. (IV) Third Example A third example of the present invention is a stereoscopic display device to which the inventions of claims 3 and 4 are applied. In this embodiment, the motion component of the original image is detected, and the stereoscopic display of the still image portion and the stereoscopic display of the moving image portion are adjusted.

I) Description of Configuration FIG. 8 shows the configuration of the stereoscopic display device of the third embodiment. As shown in FIG. 8, the stereoscopic display device 102 of the third embodiment is
Instead of the delay circuit 16 in the stereoscopic display device 100 of the embodiment, a signal before and after the frame memory 4 is input to detect a motion component of a moving image, and a detection signal of the motion direction detection circuit 19. And a field switching signal F, and a gate 31 that takes an exclusive logical wheel, and a synchronization signal switching block 30 that is interposed between the synchronization signal generation circuit 15 and the adders 17 and 18.

The other components of the stereoscopic display device 102 are the same as those of the stereoscopic display device 100 of the first embodiment.
The description is omitted. The sync signal switching block 30 includes a delay circuit 32 that delays the horizontal sync signal from the sync signal generation circuit 15, and a horizontal sync signal that has passed through the delay circuit 32 corresponding to the switch signal from the gate 31 or a horizontal sync signal without delay. A switch 33 for supplying one of the two to the adder 17,
A switch 34 for supplying the delayed horizontal synchronizing signal or the horizontal synchronizing signal without delay, whichever signal is not selected by the switch 33, to the adder 18.

The sync signal switching block 30 is shown in FIG.
It is also possible to replace with the synchronization signal switching block 30 'shown in FIG. As shown in FIG. 9, the sync signal switching block 30 'includes a delay circuit 37 for delaying the horizontal sync signal,
A switch 36 for selecting either the horizontal synchronizing signal delayed by the switching signal from the gate 31 or the horizontal synchronizing signal without delay and supplying it to the adders 17 and 18.

For convenience of explanation, an image signal without delay is V _4, and the screen display on the monitor 20 by this image signal is an adjusted image G ₄ . Also, the frame memory 4
The image signal delayed by is set to V _5, and the screen display on the monitor 20 by this image signal is set to G ₅ .

Ii) Description of Operation Next, the operation will be described. The purpose of the operation of this embodiment is to harmonize the stereoscopic effect of the still image portion and the stereoscopic effect of the moving image portion. Therefore, the moving direction detection circuit 19 detects the moving direction of the moving image and changes the stereoscopic display of the still image portion in accordance with the moving direction of the moving image.

For this reason, the motion direction detection circuit 19 uses the original image signal V ₁ before delay and the image signal delayed by one frame in the frame memory 4 to detect the moving image portion included in the original image G ₁ . Extract motion components.

More specifically, first, the movement direction detection circuit 19 specifies the coordinates of a point having a moving image component by a known technique such as contour extraction. Then, using the following method,
The amount of movement, the direction of movement, etc. are detected. Method of Motion Detection A method of motion detection applied to this embodiment will be briefly described. Both are known image processing techniques.

Find the deviation that minimizes the difference between successive images.
This is a method in which the image with no delay and the delayed image are slightly shifted, and a position where the difference is minimized is searched for, and the position is set as the direction of movement. Specifically, with the coordinates of a pixel set to (x, y), the delayed image g
Considering _i−1 (x, y) and the delay-free image g _i (x, y), the delay-free image is shifted to obtain equation (1) or (2).
Is to find the direction that minimizes. In order to speed up the calculation, the number of pixels exceeding the threshold value in the (8 × 8) and (16 × 16) pixel blocks is counted, and the minimum (ξ, η) is calculated. May be.

[0096]

[Equation 1] The cross-correlation function method previous frame for obtaining the deviation of the maximum (delayed) image _{g i-1 (x, y} ) and (without delay) of the frame current image g _i (x, y) correlation function is , Equation (3).

[0097]

[Equation 2] If the image g _i-1 (x, y) of the previous frame is moved by (ξ ₀ , η ₀ ) to become the image of the current frame, h
The maximum value of (ξ, η) is at (ξ ₀ , η ₀ ), and the moving amount and moving direction can be known from them. Method of obtaining the amount of movement by the ratio between images of Fourier transform When the image is g (x, y), this Fourier transform is G
Assuming (μ, ν), the Fourier transform when moving by the distance (a, b) is expressed by equation (4).

[0098]

(Equation 3) Therefore, gi- ₁ (x, y) moves by (a, b) and g
_{If i-1} (x-a, y-b) is obtained, equation (5)
Is

[0099]

[Equation 4] Therefore, the moving amount (a, b) can be calculated. Now, the movement direction detection circuit 19 generates a detection signal using the above arithmetic expression, for example, when the moving image component is moving to the right, the H level is generated, and when it is moving to the left, the L level is generated. To do.

It is assumed that the moving image is moving leftward. In this case, the movement direction detection circuit 19 outputs the L level as the detection signal. When the detection signal is at the L level, the gate 31 supplies the supplied field switching signal F to the synchronization signal switching block 30 without changing the logic. Therefore, in the odd field, the delay circuit 32 switches to the adder 18 side, and the delayed horizontal synchronizing signal of the image signal V ₅ is delayed by a predetermined amount.

With the logic shown in FIG. 8, each switch 10, 22,
If 33 and 34 are switched, the observer recognizes the adjusted image G ₄ with the right eye and the delayed image G ₅ with the left eye. When the moving image is moving to the left, the delayed image G ₅ of the moving image portion is recognized on the right side of the adjusted image G ₄ . At this time, the line of sight of the observer intersects in front of the screen of the monitor, and the virtual image of the moving image portion is recognized in front of the screen.

On the other hand, due to the delay of the horizontal synchronizing signal, the entire delayed image G ₅ is displayed while being shifted to the left. Since the observer recognizes the delayed image G ₅ with the left eye and the adjusted image G ₄ with the right eye, the lines of sight of both eyes observing the still image portion intersect behind the screen of the monitor. Therefore, the observer recognizes the virtual image of the still image portion in the back of the screen.

As described above, while the moving image is moving to the left,
The observer recognizes the moving image portion in the front and the still image portion in the back with the monitor screen interposed therebetween. Next, consider the case where the moving image is moving to the right.

At this time, the movement direction detection circuit 19 outputs an H level detection signal. When the detection signal is at the H level, the gate 31 inverts the logic of the field switching signal F and supplies it to the synchronization signal switching block 30. Therefore, in the odd field, the delay circuit 32 is switched to the adder 17 side, and the horizontal synchronizing signal of the adjusted image signal V ₄ is delayed by a predetermined amount.

As described above, the observer views the adjusted image G _{4 with his} right eye.
Since recognizing the delayed image G ₅ with the left eye recognizes, when the moving picture is moving in the right direction, the delayed image G ₅ of the moving image portion
Is recognized on the left side of the adjusted image G ₄ . At this time, the observer's line of sight intersects behind the screen of the monitor, and the observer recognizes the virtual image of the moving image portion behind the screen.

On the other hand, due to the delay of the horizontal synchronizing signal, the entire adjusted image G ₄ is displayed by shifting it to the left. Therefore, the lines of sight of both eyes of the observer intersect in front of the screen of the monitor. Therefore, the observer recognizes the virtual image of the still image portion in front of the screen.

As described above, while the moving image is moving to the right,
The observer inserts the moving image part further in the back of the monitor screen,
Recognize the still image part in the foreground. In FIG. 8, the logic of the detection signal of the movement direction detection circuit 19 is reversed, or the output of the switch 34 is sent to the adder 17 and the switch 33.
By connecting the output of 1 to the adder 18, the sense of distance of the virtual image recognized by the observer can be emphasized. That is, in the case of such a configuration, the changing direction of the virtual image of the moving image portion and the changing direction of the virtual image of the still image portion are added.

According to the above description, the virtual image of the moving image and the still image alternately appear or retract depending on the direction of movement. To make the display of the virtual image constant, an inverter means for inverting the logic of the field switching signal F according to the detection signal of the motion detection circuit 19 is provided, and the field switching signal F is supplied to the switch 10 via this inverter. Turn into.

By doing so, the positions of the virtual images of the moving image and the still image are constant regardless of the moving direction of the moving image. That is, regardless of whether the moving image moves to the right or to the left, the moving image is always in the back and the still image is in the front (or the moving image is in the front and the still image is in the back) in a stable context. Can be displayed.

Iii) Effects As described above, according to the third embodiment, the stereoscopic display of the still image portion is matched with the stereoscopic display of the moving image portion, and a stereoscopic effect is created in the front and rear of the actual screen. The effect or the effect of emphasizing the three-dimensional effect can be obtained. (V) Fourth Embodiment In the fourth embodiment of the present invention, in addition to the horizontal stereoscopic effect as in each of the above embodiments, a vertical stereoscopic effect (vertical direction) of the screen is created even in the still image portion. .

I) Description of Configuration The configuration of the stereoscopic display device of the fourth embodiment is the same as that of the first to third embodiments.
Since the same configuration as each stereoscopic display device of the embodiment is used, the description thereof will be omitted.

However, the memory controller 7 (7 ') is set to 1
In addition to the frame period delay, a horizontal line unit delay is added to obtain a delayed image G ₁₁ . An image supplied to the monitor 20 without being delayed by the frame memory 4 is referred to as an adjusted image G ₁₂ . A stereoscopic display image obtained by switching the both in field units is G ₁₃ .

Ii) Description of Operation Next, the operation of the fourth embodiment will be described. Also in the stereoscopic display device described in each of the above-described embodiments, it is possible to create a stereoscopic effect in the vertical direction with respect to the moving image portion as it is in the stereoscopic display device described in each of the embodiments. However, for the still image portion, it is necessary to obtain a vertical stereoscopic effect by changing the timing of starting reading from the frame memory 4 by the memory controller 7 (7 ′).

FIG. 10 shows an explanatory diagram for creating a stereoscopic effect in the vertical direction. FIG. 10A is an enlarged view of the field A1 shown in FIG. As shown in FIG. 10A, in this embodiment, the memory controller 7
(7 ') changes the read address change in units of horizontal lines for creating a delay in the vertical direction. In other words, the frame memory 7 (7 ') delays the stored image data by one frame, further delays by a predetermined horizontal synchronization period, and reads it in synchronization with the horizontal synchronization signal.

For example, in FIG. 10A, in the original image signal, the horizontal line H ₁ arranged in order in one field period
H ₂₆₃ is delayed by two horizontal lines in the delayed image.

FIG. 10B shows a state in which the delayed image signal thus read is displayed on the monitor 20. In FIG. 10B, the original image input to the stereoscopic display device is G ₁₀ . In the original image G _10, there is a “bird” subject. If a delay image is generated by adding the delay in the horizontal line direction as described above, a delay image is displayed as G ₁₁ .

In G ₁₁ , the display position of the “bird” in the original image G ₁₀ indicated by the broken line changes by Δh in the horizontal direction and Δv in the vertical direction. Here, the horizontal displacement amount Δh is based on the movement of the moving image, based on the delay of the horizontal synchronizing signal described in the first embodiment, or the read start address in pixel units described in the second embodiment. , Which is based on the change of.

The vertical displacement is caused by the memory controller 7 (7 ') delaying the start of reading the image data. This delay occurs equally in both the moving image portion and the still image portion.

The operation when the display is made on the monitor as described above will be described. For example, as shown in FIG. 10B, an observer is observing the monitor while lying down.
Both eyes of the observer are aligned vertically.

At this time, the display position on the monitor is different between the screen display displayed by the delay image G ₁₁ and the adjustment image ₁₂ displayed without delay. Since the delayed image G ₁₁ and the adjusted image G ₁₃ forming the stereoscopic display image G ₁₃ also include parallax in the vertical direction, an observer who recognizes the parallax with the binocular aligned in the vertical direction has a stereoscopic effect. You will feel

Iii) Effects As described above, according to the fourth embodiment, it is possible to create a stereoscopic effect in the direction perpendicular to the still image portion.

According to the present embodiment, by detecting the vertical movement of the screen, the stereoscopic display of the moving image portion and the stereoscopic display of the still image portion described in the third embodiment are matched. Can be achieved.

[0123]

According to the first and second aspects of the invention, the image delay means changes the display position of the image having the motion component, and the display position adjusting means changes the display position of the entire original image. It is possible to provide a stereoscopic display device that creates a stereoscopic effect for both still images and moving images. Further, since the stereoscopic effect of the moving image portion and the stereoscopic effect of the still image portion are different, rich stereoscopic display can be provided.

According to the third aspect of the present invention, the moving image detecting means detects the presence or absence of the moving image component, and the display position adjusting means selects the image signal for adjusting the display position in response to this. Therefore, the stereoscopic display of the still image portion can be changed according to the stereoscopic display of the moving image portion that fluctuates before and after the actual screen from the moving direction of the moving image. In addition, the apparent display position of the stereoscopic display can be adjusted so as to always be either the front side or the back side of the screen, and the stereoscopic effect can be stabilized.

According to the fourth aspect of the invention, since the image delay means is composed of the frame memory, a completely stable frame image can be obtained, and smooth three-dimensional display without flickering can be performed.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of stereoscopic display according to the present invention.

FIG. 2 is a block diagram showing a stereoscopic display device of a first embodiment.

FIG. 3 is a frame relationship diagram for explaining the operation of the stereoscopic display device.

FIG. 4 is an explanatory diagram of a horizontal synchronizing signal in the stereoscopic display device according to the first embodiment.

FIG. 5 is a block diagram showing a stereoscopic display device of a second embodiment.

FIG. 6 is a flowchart illustrating an operation of the stereoscopic display device according to the second embodiment.

FIG. 7 is an explanatory diagram showing how image data is read by the stereoscopic display device according to the second embodiment.

FIG. 8 is a block diagram showing a stereoscopic display device of a third embodiment.

FIG. 9 is a modification of the synchronization signal switching block.

FIG. 10 is an explanatory diagram of a method of creating a stereoscopic effect in the vertical direction.

[Explanation of symbols]

G ₁ ... Original image G ₂ ... Adjusted image G ₃ ... Stereoscopic image S _R ... Electronic shutter for right eye S _L ... Electronic shutter for left eye 1 ... Synchronous signal cutting circuit 2 ... Video input terminal 3 ... A / D converter 4 ... Frame Memory 5 ... Synchronous separation circuit 6 ... PLL circuit 7, 7 '... Memory controller 8, 9 ... D / A converter 10, 22, 33, 34, 36 ... Switch 11 ... Burst discontinuity detection circuit 12 ... Color phase shift circuit 13 ... Crystal oscillator 14 ... Image output terminal 15 ... Synchronous signal generation circuit 16, 32, 37 ... Delay circuit 17, 18 ... Adder 19 ... Movement direction detection circuit 20 ... Monitor 21 ... Stereoscopic observation glasses 23 ... Driving pulse oscillator 24, 25 ... Driver 30, 30 '... Sync signal switching block 100, 101, 102 ... Stereoscopic reproduction device 200 ... Liquid crystal driver device

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Minoru Tateno 4-2610 Hanazono, Tokorozawa, Saitama Prefecture Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Manabu Okamoto 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Hiroshi Otsubo 4-2610 Hanazono, Tokorozawa City, Saitama Prefecture Pioneer Co., Ltd. Tokorozawa Plant

Claims (4)

[Claims] 1. A switching signal generating means for generating a field switching signal for switching between an odd field and an even field corresponding to an original image signal; and inputting the original image signal, delaying the original image signal by a predetermined time. An image delay unit that outputs a delayed image signal, a display position adjusting unit that adjusts the position of the synchronization signal of either the original image signal or the delayed image signal, and the original image signal or the delayed image signal Field switching means for generating either one of the data in which the position of the synchronization signal is adjusted and the other data in which the position of the synchronization signal is not adjusted for each field based on the field switching signal to generate a stereoscopic image signal. And an image for the right eye and an image for the left eye are alternated for each field based on the stereoscopic image signal and the field switching signal. Stereoscopic display apparatus comprising: the stereoscopic display means for switching the display, the. 2. A switching signal generating means for generating a field switching signal for switching between an odd field and an even field in correspondence with an original image signal, and based on the control of the display position changing means by inputting the original image signal. An image delay means for outputting a delayed image signal obtained by delaying the original image signal for a predetermined time, and a delayed image by changing the read start address of each horizontal line of the image delay means from the start address at the time of writing and reading the delayed image. The display position changing means for adjusting the display position of the signal; the field switching means for generating the stereoscopic image signal by switching the original image signal and the delayed image signal for each field based on the field switching signal; An image for the right eye and an image for the left eye are alternately switched for each field based on the image signal and the field switching signal. Stereoscopic display apparatus comprising: the Shimesuru stereoscopic display means. 3. The stereoscopic display device according to claim 1, further comprising moving image detection means for detecting the presence or absence of a moving image component in the original image based on the original image signal and the delayed image signal. The display position adjusting means selects an image signal whose display position is to be adjusted in accordance with the moving direction of the moving image represented by the moving image component. 4. The stereoscopic display device according to claim 1, wherein the image delay unit is composed of a video memory, and applies a delay amount in units of frames to the original image signal. .