JP2002095017A - Stereoscopic video display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic video display system which can appreciate a stereoscopic video, even when the system halts at the time of reproduction. SOLUTION: The system is provided with a video-reproducing device 101 for reproducing right and left video signals which are recorded time-visually with right and left parallax, memories 105 and 106 recording the right and left video signals reproduced by the video-reproducing device 101, a switch 107 for switching and outputting the right and left video signals recorded in the memories 105 and 106 at a prescribed period and a control part 109 for controlling inhibition of the writing of data into the memories 105 and 106, when the reproduction of the right and left recorded video signals is stopped temporarily. Data is displayed, based on the video signal switched and outputted by the switch 107.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display system for viewing stereoscopic images.

[0002]

2. Description of the Related Art Conventionally, in order to appreciate a stereoscopic video recorded in a time-division manner, left and right images corresponding to the left and right eyes are displayed on a display unit in a time-division manner and synchronized with this display cycle. They are viewed using shutter glasses that open and close alternately on the left and right. In this time division method, left and right images are recorded alternately every field (every 1/60 second). That is, the image for the right eye is switched once every 1/30 second, and the image for the left eye is switched once every 1/30 second.

[0003] In other words, a stereoscopic video recorded at a frequency of 60 Hz becomes half the information when viewed as left and right video, so that flickering of the image, that is, flickering occurs at the time of viewing.

Therefore, a double speed converter is used to reduce the influence of the flicker. By passing a stereoscopic video signal composed of alternating left and right video signals recorded in a 60 Hz field time-division through a double-speed converter, the left-right switching synchronization is changed from 60 Hz to 120 Hz, and it is possible to view a stereoscopic video without flicker. FIG. 4 shows a conventional example of this double-speed converter.

FIG. 4 is a circuit block diagram showing a configuration of a conventional example. In FIG. 4, reference numeral 401 denotes a video playback device (VT
R), and reproduces a stereoscopic video signal in which left and right images are recorded for each field. Reference numeral 402 denotes a synchronization signal generation unit which synchronizes a signal (60 Hz) from a video signal (stereoscopic video signal) with a signal (120 Hz) whose frequency is doubled.
Hz).

Reference numeral 403 denotes an A / D converter, which converts an analog video signal into a digital signal. Reference numeral 404 denotes a changeover switch that switches the left and right images of the video signal in synchronization with a signal (60 Hz) from the synchronization signal generation unit 403 and inputs the same to a memory at a subsequent stage.

Reference numeral 405 denotes a memory for the right eye, which stores a right-eye image of a video signal for one field. 40
Reference numeral 6 denotes a left-eye memory, which stores a left-eye image of a video signal for one field. Reference numeral 407 denotes a changeover switch, which is a memory 405 for the right eye and a memory 4 for the left eye.
The video signal stored in each of the sections No. 06 is switched by the signal of 120 Hz from the synchronization signal generating section 402 and output to the subsequent stage.

Reference numeral 408 denotes a D / A converter, which converts a digitally processed stereoscopic video signal into an analog signal. 40
Reference numeral 9 denotes a display device that displays a stereoscopic image.

Here, a video signal (stereoscopic video signal) c in which the left and right signals shown in FIG. 3 are arranged in a time-division manner is converted into a digital signal, and the left and right images are divided and stored in respective memories and doubled. A double-speed converter is configured to output the video signal (time-division stereoscopic video signal) d shown in FIG. 3 at twice the frequency by switching and outputting the frequency and switching to the analog signal.

[0010]

However, in the above-mentioned conventional example, when the stereoscopic video is paused while playing back,
Since only the same signal is input from the VTR, the same paused video is always recorded on both the left and right memories of the double-speed converter while being overwritten, and the output video is doubled as shown in FIG. There is a problem that the image is not a divided stereoscopic image still image but a simple 2D (two-dimensional) still image.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a stereoscopic video display system capable of viewing a stereoscopic video even when playback is paused. I do.

[0012]

A three-dimensional image display system according to the present invention is configured as follows.

(1) In a stereoscopic video display system for displaying left and right image signals having parallax with each other based on time-divisionally input signals of the left and right image signals, the input left and right image signals are respectively Memory for recording, switching means for switching and outputting the left and right image signals recorded in each memory at a predetermined cycle, and writing to the memory is inhibited when the input of the left and right image signals is stopped. Prohibition means, and display is performed based on the image signal output by switching by the switching means.

(2) In a stereoscopic video display system for displaying left and right image signals having parallax based on time-division input signals, a signal synchronized with the input left and right image signals is generated. Synchronization signal generating means;
A memory for recording left and right image signals respectively corresponding to the synchronized signals, switching means for switching and outputting the left and right image signals recorded in the memories at a predetermined cycle, and the left and right image signals Prohibiting means for prohibiting writing to the memory when the input is temporarily stopped, and display is performed based on an image signal output by switching by the switching means.

(3) In a stereoscopic video display system for displaying left and right image signals having parallax with each other on the basis of an input signal arranged in a time division manner, a signal synchronized with the input left and right image signals is generated. Synchronization signal generating means;
A first memory for recording left and right image signals corresponding to the synchronized signals, a second memory for recording left and right image signals output from the first memories, and a second memory for recording the left and right image signals. Switching means for switching and outputting the left and right image signals recorded in each of the memories at a predetermined cycle, and determining means for determining whether the left and right image signals of each of the first memories match each other, Prohibiting means for prohibiting writing to the second memory when the right and left images of the first memories are determined to be coincident by the determining means, and switching and outputting the data by the switching means. The display is performed based on the image signal.

(4) In the stereoscopic video display system of (1), the left and right image signals are reproduction signals output from reproduction means for reproducing a video signal in which the left and right image signals are recorded in a time-division manner. And

(5) In the stereoscopic video display system of (4), the prohibiting means is configured to prohibit writing to the memory when the reproducing means is temporarily stopped.

(6) In the stereoscopic video display system of (5), the reproducing means is a VTR.

(7) In the stereoscopic video display system of (2), the left and right image signals are reproduction signals output from reproduction means for reproducing a video signal in which the left and right image signals are recorded in a time-division manner. And

(8) In the stereoscopic video display system of (7), the prohibiting means is configured to prohibit writing to the memory when the reproducing means is temporarily stopped.

(9) In the stereoscopic video display system of (3), the left and right image signals are reproduction signals output from reproduction means for reproducing a video signal in which the left and right image signals are recorded in a time-division manner. And

(10) In the stereoscopic video display system according to (3), the writing of the image signal to the first memory is synchronized with the reading of the image signal from the second memory by the synchronization. did.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram showing the configuration of the video display system according to the first embodiment.

In FIG. 1, reference numeral 101 denotes a video reproducing apparatus (V
TR), which constitutes an input means for inputting a stereoscopic image signal composed of left and right image signals, and reproduces a stereoscopic video signal composed of left and right alternating video (image) signals recorded by field time division. Reference numeral 102 denotes a synchronization signal generation unit,
Signal (60 Hz) a synchronized from the video signal shown in
Then, a signal b of a signal (120 Hz) whose frequency is doubled is generated.

Reference numeral 103 denotes an A / D converter, which converts an analog video signal (stereoscopic video signal) shown in FIG. 3 into a digital video signal c. Reference numeral 104 denotes a changeover switch, which synchronizes with the 60 Hz signal from the synchronizing signal generation unit 102, and inputs the video signal to the memory at the subsequent stage in accordance with the timing of the left and right images of the video signal.

Reference numeral 105 denotes a memory for the right eye, which stores a video signal for the right eye of a video symbol for one field. Reference numeral 106 denotes a memory for the left eye, which stores a video signal for the right eye of the video signal for one field. 107
Is a changeover switch.
The video signals stored in the synchronizing signal generator 1
Switching in synchronization with the 120 Hz signal b from 02
The output is switched to the video signal d having a field frequency of 0 Hz.

A D / A converter 108 converts a digitally processed video signal into an analog video signal. Reference numeral 109 denotes a control unit which sends a pause signal to the video playback device 101 when displaying a still image,
By controlling 0, overwriting to the memories 105 and 106 is prohibited.

The switch 110 becomes OPEN when a still image is displayed, shuts off the output of the A / D converter 103, and prohibits the memories 105 and 106 from being overwritten. 11
Reference numeral 1 denotes a display device, which displays a stereoscopic image based on the video signal converted by the D / A converter 108 into an analog signal.

With the above configuration, first, a stereoscopic video in which left and right video images are recorded in a time-division manner is reproduced by the video reproducing apparatus 101.
To output a video signal (stereoscopic video signal) c shown in FIG. Then, the synchronization signal generator 102 extracts a vertical synchronization signal from the video signal c, and generates a pulse (synchronization signal a having a frequency of 60 Hz shown in FIG. 3) whose High and Low are inverted in accordance with the vertical synchronization signal. At the same time, a pulse whose frequency is doubled (frequency 120H shown in FIG. 3)
Create a synchronization signal b) of z. The video signal is A /
The image is converted into a digital image for each frame by the D converter 103 and output.

In the changeover switch 104, the connection is switched to one of them according to the input pulse High or Low. Since this input signal is a pulse signal of 60 Hz, the switch is inverted at 60 Hz. Therefore, since the A / D-converted video signal has left and right images alternately in a time-sharing manner of 60 Hz, the right-eye image and the left-eye image are divided and output by passing through the changeover switch 104.

The right-eye memory 105 stores one field of the right-eye digitally converted image divided by the changeover switch 104. This memory is overwritten each time a new signal is input.

Similarly, the left-eye memory 106 stores one field of the left-eye digitally converted video divided by the changeover switch 104. When a new signal is input, the memory 106 is overwritten each time. Then, the connection is switched to one of the switches 107 by the input pulse High or Low. Since this input signal is a pulse signal of 120 Hz, the switch is inverted at 120 Hz.

Therefore, the memories 105 and 106 at 60 Hz
The left and right images written to are 120 Hz, that is, 2
It is output as a double time-division video signal. Next, D /
The A converter 108 converts the digitally processed video into an analog video signal d shown in FIG. At this time, 12
By using shutter glasses driven at 0 Hz, a stereoscopic image without flicker can be viewed.

Next, consider a case where the double-speed converted stereoscopic video is temporarily stopped.

When the viewer pauses, the control unit 109 first outputs a signal to the video reproducing apparatus 101 indicating that the viewer has paused. This signal allows the video playback device 101
The side suspends the reproduction of the stereoscopic video.

Then, the right and left memories 1 are supplied to the switch 110.
A signal is output to prohibit overwriting to 05 and 106. With this signal, the switch 110 becomes OPEN. Therefore, since the contents of the left and right memories 105 and 106 and their outputs store the video for the right eye and the video signal for the left eye immediately before the pause signal is input, the D / A converter 108 When the video signal e shown in FIG. 3 is input, a stereoscopic still image driven at double speed can be viewed.

If a temporary stop signal is input, it is assumed that the switch 110 is not opened and the video is overwritten on the memories 105 and 106 as it is. When the video playback device 101 that plays back the stereoscopic video is paused, either the left or right video is output in succession. When this is input to the double-speed converter as it is, the memory 10 for the right eye
5. The same video is stored in the memory 106 for the left eye, and the video signal f shown in FIG. Therefore, even if the speed is doubled, the left and right images are the same and the stereoscopic image cannot be viewed.

Therefore, in the present invention, the switch 110 is set to OPEN during a temporary stop to prohibit overwriting the memories 105 and 106.

As described above, in the first embodiment, in the three-dimensional video display system that performs display based on video signals recorded in a time-division manner with right and left parallax, video reproduction for reproducing the recorded left and right video signals is performed. Apparatus (reproduction means) 1
01, a synchronizing signal generating section (synchronizing signal generating means) 102 for generating a signal synchronized with the video signal reproduced by the video reproducing apparatus 101, and a left and right video signal corresponding to the synchronized signal. Memories 105 and 106 for recording and a changeover switch (switching means) 107 for switching and outputting left and right video signals recorded in the memories 105 and 106 at a predetermined cycle.
And a control unit (prohibiting means) 109 for performing control to prohibit writing to the memories 105 and 106 when reproduction of the recorded left and right video signals is paused. You can watch the video.

FIG. 2 is a circuit block diagram showing the configuration of the video display system according to the second embodiment.

In FIG. 2, reference numeral 201 denotes a video reproducing apparatus (V
TR) to reproduce a stereoscopic video signal. Reference numeral 202 denotes a synchronizing signal generation unit which synchronizes a signal (60 Hz) from a video signal with a signal (120
Hz).

An A / D converter 203 converts the analog video signal shown in FIG. 3 into a digital video signal c. Reference numeral 204 denotes a changeover switch, which switches in accordance with the timing of the left and right images of the video signal.

Reference numeral 205 denotes a right-eye memory (1), which stores a video symbol right-eye video signal for one field. Reference numeral 206 denotes a left-eye memory (1), which stores a left-eye video signal of the video signal for one field.

Reference numeral 207 denotes a second right-eye memory (2), which is a right-eye video immediately preceding the right-eye video stored in the first right-eye memory (1) 205. The signal is stored for one field. Reference numeral 208 denotes a second left-eye memory (2), which stores a left-eye video signal immediately before the left-eye video stored in the first left-eye memory (1) 206 into 1 Store only the fields.

Reference numeral 209 denotes an image processing circuit which matches the image of the first right-eye memory (1) 205 with the image (video signal) of the first left-eye memory (1) 206. Compare whether or not.

Reference numeral 210 denotes a control unit, which is a video processing circuit 20.
If it is determined in step 9 that the contents of the first left and right memories (1) 205 and 206 match, the second right eye memory (2)
207 and the second left-eye memory (2) 208 are prohibited from being overwritten.

Reference numeral 211 denotes a switch which is controlled to be opened and closed by the control unit 210. When the video processing circuit 209 determines that the contents of the first left and right memories (1) 205 and 206 match, the switch is opened and the second processing is performed. Memory for right eye (2)
207 is prohibited from being overwritten.

Reference numeral 212 denotes a switch that is controlled to be opened and closed by the control unit 210. When the video processing circuit 209 determines that the contents of the first left and right memories (1) 205 and 206 match, the switch is opened and the second left eye is opened. Memory (2) 2 for
08 is prohibited from being overwritten.

Reference numeral 213 denotes a changeover switch, which switches the video signal stored in the second left and right memories (2) 207 and 208 at 120 Hz and outputs it.

A D / A converter 214 converts a digitally processed three-dimensional signal into an analog signal. A display device 215 displays a stereoscopic image based on the video signal converted to an analog signal by the D / A converter 214.

With the above-described configuration, first, a stereoscopic video in which left and right video images are recorded in a time-division manner is reproduced by the video reproducing device 201.
To output a video signal (stereoscopic video signal) c shown in FIG. Then, the synchronizing signal generation unit 202 extracts the vertical synchronizing signal from the video signal c, and generates a pulse in which High and Low are inverted (a synchronizing signal a having a frequency of 60 Hz shown in FIG. 3). At the same time, a pulse whose frequency is doubled (frequency 120H shown in FIG. 3)
Create a synchronization signal b) of z. The video signal is A /
The data is converted into a digital image for each frame by the D converter 203 and output.

In the changeover switch 204, the connection is switched to one of them according to the input pulse High or Low. Since this input signal is a pulse signal of 60 Hz, the switch is inverted at 60 Hz. Therefore, since the A / D-converted video signal has left and right images alternately in a time-sharing manner of 60 Hz, the right-eye image and the left-eye image are divided and output by passing through the changeover switch 204.

The first right eye memory (1) 20
In step 5, the digitally converted video for the right eye divided by the changeover switch 204 is stored for one field. The memory (1) 205 overwrites each time a new signal is input, and the contents of the memory up to that point are output to the next second memory (2) 207.

Similarly, the first left eye memory (1) 20
In step 6, the digitally converted image for the left eye divided by the changeover switch 204 is stored for one field. The memory (1) 206 overwrites each time a new signal is input, and the contents of the memory up to that point are output to the next second memory (2) 208.

The second right eye memory (2) 20
7, the output from the first right eye memory (1) 205 is stored. That is, the first right eye memory (1) 2
The image for the right eye immediately before the image for the right eye stored in 05 is stored for one field. Similarly, the first left-eye memory (1) 2 is stored in the second left-eye memory (2) 208.
The output from 06 is stored. These second memories (2) 207 and 208 are also overwritten each time a new signal is input.

Then, the video processing circuit 209 compares whether the video in the first right-eye memory (1) 205 and the video in the first left-eye memory (1) 206 match. That is, a video reproducing apparatus 201 for reproducing a stereoscopic video
Is paused, unlike the case where the right-eye video and the left-eye video are alternately output until then, in the pause state, either the left or right video is continuously output.

That is, the left and right images are separated by the double-speed converter, and each is stored in the memory (the first right-eye memory (1)).
205 and the first left eye memory (1) 206), they are the same. Therefore, the video processing circuit 209 checks whether or not the contents of the left and right memories match, thereby checking whether or not the stereoscopic video is in a pause state.

As a result, if the contents of the first left and right memories (1) 205 and 206 match, that is, if the contents of the first left and right memories (1) 205 and 206 are in a suspended state, the control unit 210 outputs an OPEN signal to the switches 211 and 212, 2 left and right memories (2) 2
07, 208 is prohibited. This is because the second left and right memories (2) 207 and 208 store the image immediately before the first left and right memories (1) 205 and 206, and the stereoscopic image is temporarily suspended. After that, the contents of the first left and right memories (1) 205 and 206 are checked, and if they match, the second left and right memory (2) 2
In the second left and right memories (2) 207 and 208, the immediately preceding right-eye video and left-eye video that have been temporarily stopped are stored by prohibiting the overwriting on 07 and 208. Thus, the video signal e shown in FIG. 3 can be output as a double-speed converter. That is, the changeover switch 213
Is switched by a pulse of a frequency of 120 Hz to output a double time-division image, the D / A converter 214 returns to an analog video signal, and the display device 215 is driven at a double speed regardless of whether it is in a pause state or not. You can watch 3D videos and still images.

As described above, the second embodiment includes the video signal processing circuit (determination means) 209 for determining whether the video signals in the memories (1) 205 and 206 match, and the control unit 210. If it is determined that the memory (2) 207, 2
Since writing to 08 is prohibited, the stereoscopic video can be viewed even when the reproduction is paused.

FIG. 3 is a diagram showing each operation of the double-speed converter. The signals described in the first and second embodiments are listed below.

In FIG. 3, a is a pulse signal of a frequency of 60 Hz generated from the vertical synchronization component of the input video signal, b is a signal of a 120 Hz pulse for driving at a double speed, and c is a signal of the input field sequential. A video signal d is a video signal that is driven at a double speed when the video signal c is input to the double-speed converter, and an output video signal e is a video signal (output video) when the input stereoscopic video is temporarily stopped in the double-speed converter. Note that f is a video signal (output video) when the input stereoscopic video is temporarily stopped in the conventional double-speed converter.

As described above, in the first and second embodiments,
When the stereoscopic video is paused (pause), the overwriting of the memory that stores the left and right video in the double-speed converter is prohibited, and the left and right video signals just before are left. Both images can be displayed.

[0063]

As described above, according to the present invention,
There is an effect that the stereoscopic video can be viewed even when the reproduction is paused.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration according to a first embodiment.

FIG. 2 is a circuit block diagram showing a configuration according to a second embodiment.

FIG. 3 is a diagram showing signals of a double-speed converter.

FIG. 4 is a circuit block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Video reproduction apparatus (reproduction means) 102 Synchronization signal generation part (synchronization signal generation means) 103 A / D converter 104 Changeover switch 105 Memory 106 Memory 107 Changeover switch (switching means) 108 D / A converter 109 Control part (prohibition) Means) 205 memory (1) (first memory) 206 memory (1) (first memory) 207 memory (2) (second memory) 208 memory (2) (second memory) 209 video processing circuit (Determining Means) 210 Control Unit (Determining Means, Prohibiting Means)

Claims (10)

[Claims] 1. A stereoscopic video display system for displaying left and right image signals having parallax with each other based on time-divided input signals of the left and right image signals. A memory for recording each, switching means for switching and outputting the left and right image signals recorded in each memory at a predetermined cycle, and writing to the memory is prohibited when the input of the left and right image signals is stopped. A three-dimensional image display system, comprising: a prohibition unit that performs a display based on the image signal output by switching by the switching unit. 2. A stereoscopic video display system for displaying left and right image signals having parallax with each other on the basis of time-division input signals, and generating a signal synchronized with the input left and right image signals. Synchronizing signal generating means for synchronizing, a memory for recording left and right image signals corresponding to the synchronized signal, and a switching means for switching and outputting the left and right image signals recorded in each memory at a predetermined cycle Prohibiting means for prohibiting writing to the memory when the input of the left and right image signals is temporarily stopped, and performing display based on the image signal switched and output by the switching means. Characteristic stereoscopic image display system. 3. A stereoscopic video display system for displaying left and right image signals having parallax with each other based on time-divided input signals, and generating a signal synchronized with the input left and right image signals. Synchronization signal generating means, a first memory for recording left and right image signals corresponding to the synchronized signal, and a second memory for recording left and right image signals output from the first memories, respectively. And switching means for switching and outputting the left and right image signals recorded in the second memories at a predetermined cycle and outputting the left and right image signals of the first memories. And a prohibition unit for prohibiting writing to the second memory when the left and right images of each of the first memories are determined to match by the determination unit, A stereoscopic video display system, wherein a display is performed based on an image signal output by switching by a switching means. 4. The apparatus according to claim 1, wherein the left and right image signals are reproduction signals output from reproduction means for reproducing a video signal in which the left and right image signals are recorded in a time-division manner.
The stereoscopic image display system as described. 5. The stereoscopic video display system according to claim 4, wherein said prohibiting means is configured to prohibit writing to said memory when said reproducing means is temporarily stopped. 6. The stereoscopic display system according to claim 5, wherein said reproducing means is a VTR. 7. The video signal according to claim 2, wherein the left and right image signals are playback signals output from a playback unit that plays back a video signal in which the left and right image signals are recorded in a time-division manner.
The stereoscopic image display system as described. 8. The stereoscopic video display system according to claim 7, wherein said prohibiting means is configured to prohibit writing to said memory when said reproducing means is temporarily stopped. 9. The apparatus according to claim 3, wherein the left and right image signals are reproduction signals output from reproduction means for reproducing a video signal in which the left and right image signals are recorded in a time-division manner.
The stereoscopic image display system as described. 10. The three-dimensional structure according to claim 3, wherein the synchronization of reading the image signal from the second memory is shorter than the synchronization of writing the image signal to the first memory. Video display system.