JP2012019376A - Spectacles for stereoscopic video appreciation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict viewing at an excessive parallax amount beyond a fusion limit without disturbing stereoscopic viewing of other viewers.SOLUTION: A stereoscopic video display apparatus 110 transmit a synchronization signal such as an infrared signal synchronized with timings of displaying left eye video and right eye video alternatively. A pair of spectacles for stereoscopic video appreciation 120 includes: a shutter control section 124 that controls opening and closing of each of a left eye shutter and a right eye shutter by the synchronization signal transmitted from the stereoscopic video display apparatus 110; a signal strength determination section 123 that determines a signal strength of the synchronization signal. The shutter control section 124 switches between a first open/close pattern for displaying stereoscopic video by alternatively opening and closing the left eye shutter and the right eye shutter and a second open/close pattern for displaying planar video by simultaneously opening and closing the left eye shutter and the right eye shutter according to the signal strength determined at the signal strength determination section 123.

Description

  The present invention relates to stereoscopic video viewing glasses for viewing a stereoscopic video on a stereoscopic video display device capable of performing stereoscopic display.

  In order to perform stereoscopic viewing using a display device, it is necessary to display different images for the left eye and the right eye. This different video is different in parallax, and the amount of parallax, that is, the amount of parallax, differs according to the depth of the subject to be stereoscopically viewed.For example, when displaying by projecting greatly in front of the display device The amount is increased, and the image for the right eye is displayed on the left side compared with the image for the left eye, and the image for the left eye is displayed on the right side compared with the image for the right eye. The parallax amount is 0, that is, the image in which the right-eye image and the left-eye image overlap is observed so as to be positioned on the display surface of the display device. An image having a parallax amount between the large parallax amount and zero parallax amount is observed to be arranged at a depth between them.

  In addition, by providing the opposite amount of parallax, it is possible to display by retracting to the back side of the display surface of the display device. When displaying the image by retracting it to the back side, the parallax amount is increased in the opposite direction, the image for the right eye is compared with the image for the left eye on the right side, and the image for the left eye is compared with the image for the right eye. In comparison, the left side is displayed with a parallax amount opposite to that in the case of popping out. Naturally, an image having a large amount of parallax and a parallax amount of 0 in the opposite direction is observed to be arranged at a depth between them.

  The above-described display jumping out to the front side of the display device and display retracting to the back side can be changed depending on the arrangement of the imaging device for photographing the subject. For example, when two imaging devices are arranged on the left and right so as to be parallel, the relationship between the imaging field of the right imaging device and the imaging field of the left imaging device is always the same with respect to the subject, and the subject is in front. Even if it is in the back, the left-right relationship is maintained. When this is displayed on the display device with the image of the right imaging device on the right eye and the image of the left imaging device is displayed on the left eye, it is possible to project the image to the front of the display device. Since the parallax disappears when the subject is at infinity, this corresponds to the display surface of the display device.

  In addition, when the two imaging devices are arranged on the left and right sides so as to face inward, the relationship between the imaging field of the right imaging device and the imaging field of the left imaging device changes according to the depth of the subject. . When the subject is in front, the imaging field of the right imaging device is on the right side, and the imaging field of the left imaging device is on the left side, but at the convergence point where the optical axes of the left and right imaging devices intersect The imaging field of view of the imaging device of FIG. Further, in the back subject, the imaging field of the right imaging device is positioned on the left side, and the imaging field of the left imaging device is positioned on the right side. When this is displayed on the display device, the image of the right imaging device is displayed on the right eye and the image of the left imaging device is displayed on the left eye, the subject in front appears to jump out in front of the display device, and the convergence point The subject appears at the same position as the display surface of the display device, and the subject behind it appears to be retracted from the display surface of the display device.

  As described above, the appearance changes depending on the arrangement of the imaging devices, and the idea of the maximum value of parallax (maximum parallax) also differs. When two imaging devices are arranged on the left and right so as to be parallel, the parallax amount becomes smaller as the subject is in the back, and conversely, the parallax amount becomes larger as the subject is closer to the subject, which corresponds to the maximum parallax. Also, when the two imaging devices are placed on the left and right with convergence so that they face inward, the parallax increases before and after the point of convergence where the amount of parallax is 0. In some cases, the maximum parallax may be obtained on the near side, and the maximum parallax may be obtained on the far side.

  The maximum parallax varies depending on the arrangement of the imaging device and the subject as described above, but also varies by shifting the left and right images to the left and right. For example, when the right image is shifted to the left by 10 pixels with respect to the left image, the amount of parallax is 10 pixels. By viewing the left image with the left eye and the right image with the right eye, the display screen of the display device The right image is shifted to the right as a whole, and the amount of parallax is changed. When the right image is shifted to the right by 10 pixels, the amount of parallax becomes 0 pixel, and the amount of parallax disappears and the image does not appear. Even if the maximum parallax of these images is 100 pixels, a shift of 10 pixels results in a parallax amount of 90 pixels, that is, the maximum parallax also changes.

  For example, Patent Document 1 proposes a method of actively using such image shift and controlling the amount of parallax. The amount of parallax changes depending on the display size of the image and the resolution (number of pixels) of the image. Therefore, the left and right images acquired by the imaging device can be displayed at any size and at what resolution (number of pixels). Depending on the observation, the amount of parallax may be large or small, but adjustment is performed by shifting the left and right images so that this is included in the binocular fusion range including the viewing distance parameter.

JP 9-121370 A

  However, in the method described in Patent Document 1, since the amount of parallax is controlled by shifting the left and right images to be displayed, when there are a plurality of viewers viewing this display device, the same parallax is given to all the viewers. The amount will be adjusted. For example, when an optimal stereoscopic image is displayed so as to match a viewer who is approaching the display device, there is a problem in that the parallax amount is controlled even if the other viewers are not approaching. Conversely, the parallax amount does not fluctuate by setting the recommended observation distance to a fixed value, but the viewer who approaches the display device may watch the video with an excessive parallax amount exceeding the fusion limit. End up.

  The present invention has been made in view of the above circumstances, and can restrict viewing of an image with an excessive amount of parallax exceeding the fusion limit without obstructing other viewers' stereoscopic vision. An object is to provide glasses for viewing stereoscopic images.

  In order to solve the above-described problem, the first technical means of the present invention provides a stereoscopic video display device that alternately displays a left-eye video and a right-eye video and transmits a synchronization signal synchronized with the display timing. Stereoscopic video viewing glasses for viewing stereoscopic video, wherein the stereoscopic video viewing glasses include a left eye shutter and a right eye shutter, and the left eye shutter and the right eye shutter according to the synchronization signal. A shutter drive control unit that controls each opening and closing drive; and a signal strength determination unit that determines a signal strength of the synchronization signal, the shutter drive control unit according to the signal strength determined by the signal strength determination unit A first opening / closing pattern for alternately opening and closing the left eye shutter and the right eye shutter to display a stereoscopic image, the left eye shutter and the right eye And the use shutters were simultaneously opened and closed driven is obtained by and switches the second opening pattern to display a planar image.

  According to a second technical means, in the first technical means, the signal strength determination unit transmits a viewing distance between the stereoscopic video display device and the stereoscopic video viewing glasses from the stereoscopic video display device. It is characterized by determining by the signal intensity of

  According to a third technical means, in the first or second technical means, the synchronization signal is an infrared signal, and the signal intensity determination unit is configured to detect the left-eye shutter and the shutter according to the light intensity of the infrared signal. A first opening / closing pattern that alternately opens and closes the right eye shutter to display a stereoscopic image, and a second opening and closing drive that simultaneously opens and closes the left eye shutter and the right eye shutter to display a planar image. It is characterized by switching between an open / close pattern.

  According to a fourth technical means, in the first or second technical means, the synchronization signal is a radio wave signal, and the signal strength determination unit is configured to detect the left-eye shutter and the shutter according to the signal strength of the radio wave signal. A first opening / closing pattern that alternately opens and closes the right eye shutter to display a stereoscopic image, and a second opening and closing drive that simultaneously opens and closes the left eye shutter and the right eye shutter to display a planar image. It is characterized by switching between an open / close pattern.

  According to a fifth technical means, in any one of the first to fourth technical means, the signal strength determination unit determines whether the signal strength of the synchronization signal is smaller than a predetermined threshold, and determines that the signal strength is large. In this case, the shutter drive control unit switches to the second opening / closing pattern and displays a planar image.

  According to a sixth technical means, in the fifth technical means, the predetermined threshold value is set according to a viewing distance between the stereoscopic video display device and the stereoscopic video viewing glasses.

  According to a seventh technical means, in the fifth technical means, the predetermined threshold value can be set by a user.

  According to the present invention, it is possible to restrict viewing of an image with an excessive amount of parallax exceeding the fusion limit without obstructing stereoscopic viewing of other viewers.

It is a block diagram which shows schematic structure of the three-dimensional video display system in the Example of this invention. It is the figure which showed a mode that two viewers (viewer X, viewer Y) are watching at a certain viewing distance on the stereoscopic video display apparatus. It is a figure which shows an example of the characteristic curve data showing transition of the intensity | strength of the infrared light with respect to viewing distance.

  Hereinafter, the stereoscopic image viewing glasses according to the present invention will be described with reference to the drawings with examples.

  FIG. 1 is a block diagram showing a schematic configuration of a stereoscopic video display system according to an embodiment of the present invention. In the figure, 100 indicates the stereoscopic video display system. This stereoscopic video display system 100 includes a stereoscopic video display device 110 and stereoscopic video viewing glasses 120, and matches the timing of left and right video (stereoscopic video) displayed by time division for alternately displaying left and right video. Thus, the glasses 120 for stereoscopic video viewing are driven and controlled to enable stereoscopic viewing.

  The stereoscopic video display device 110 includes a video display unit 111, a video identification signal generation unit 112, and a synchronization signal transmission unit 113. The stereoscopic video viewing glasses 120 include a synchronization signal reception unit 121, a shutter control signal generation unit. 122, a signal intensity determination unit 123, a shutter drive control unit 124, a left-eye shutter 125L, and a right-eye shutter 125R.

  The video display unit 111 is configured by a liquid crystal display, and generates a left-eye video and a right-eye video from an input video signal when performing stereoscopic viewing, and alternately displays them in a time-division manner. The liquid crystal display in the present embodiment displays video at a driving frequency of 240 Hz when displaying two-dimensional video, and displays left and right video at 120 Hz when displaying stereoscopic video. Composed.

  The video identification signal generation unit 112 generates a video identification signal for controlling the stereoscopic video viewing glasses 120 synchronized with the timing of the left and right videos displayed on the video display unit 111, and transmits the generated video identification signal as a synchronization signal. Send to section 113. The synchronization signal transmission unit 113 transmits the received video identification signal as the synchronization signal 114. In this example, the synchronization signal 114 is transmitted as an infrared signal. Information indicating at what timing the video display unit 111 displays the left-eye video or the right-eye video is given to the video identification signal, and the stereoscopic video viewing glasses 120 correspond to the video identification signal. It is configured to be driven synchronously. As the video identification signal in this example, for example, a rectangular wave pulse signal for identifying left and right videos is transmitted. Here, a simple pulse pattern may be used, or a signal of another different method may be used. Further, by encoding the pattern, the influence of interference from infrared light used in other devices such as a remote controller that handles a close wavelength range may be reduced.

  The synchronization signal transmission unit 113 includes an infrared LED having a wavelength of 850 nm, drives the infrared LED based on the video identification signal generated by the video identification signal generation unit 112, and transmits the video identification signal to the infrared synchronization signal 114. The infrared signal 114 is transmitted into the space. For simplification of explanation, the infrared signal 114 described in this example indicates the synchronization signal 114.

  The infrared signal 114 transmitted from the stereoscopic video display device 110 is received by the synchronization signal receiving unit 121 included in the stereoscopic video viewing glasses 120. The synchronization signal receiver 121 sends a video identification signal indicating the timing of the left and right videos from the infrared signal 114 to the shutter control signal generator 122 and the light intensity information of the infrared signal 114 to the signal strength determiner 123.

  The signal strength determination unit 123 uses the light intensity of the infrared signal 114 received by the synchronization signal reception unit 121 to view the viewer using the stereoscopic video viewing glasses 120 at a position away from the stereoscopic video display device 110. And the determination value (determination result) is input to the shutter control signal generation unit 122.

  The shutter control signal generator 122 generates a shutter control signal for controlling the left and right shutters from the infrared signal 114 received from the synchronization signal receiver 121, and sends the shutter control signal to the shutter drive controller 124.

  The shutter drive control unit 124 drives and controls the left-eye shutter 125L and the right-eye shutter 125R based on the shutter control signal generated by the shutter control signal generation unit 122. The left and right shutters are configured by a liquid crystal panel, for example, and are controlled to be in a transmission (open) / non-transmission (closed) state according to a voltage value applied from the shutter drive control unit 124.

  The shutter control signal generation unit 122 generates a shutter control signal for controlling the opening / closing pattern of the left-eye shutter 125L and the right-eye shutter 125R, and the shutter drive control unit 124 generates the left-eye shutter based on the shutter control signal. The opening / closing pattern of the shutter 125L and the right-eye shutter 125R is switched. The shutter control signal generation unit 122 generates a shutter control signal for allowing the viewer to stereoscopically view when viewing the stereoscopic video based on the determination result of the signal strength determination unit 123. If viewing of a stereoscopic video is not permitted based on the determination result, a shutter control signal for viewing a planar video (conventional two-dimensional video) that is the same video with no parallax between the left and right eyes is generated.

  That is, when viewing stereoscopic video, the first opening / closing pattern of the left-eye shutter 125L and the right-eye shutter 125R is switched. In the case of this first opening / closing pattern, at the timing when the left-eye image is displayed on the stereoscopic image display device 110, the left-eye shutter 125L is set to the transmissive state, the right-eye shutter 125R is set to the non-transmissive state, At the timing when the eye image is displayed, the left eye shutter 125L is made opaque and the right eye shutter 125R is made transparent so that the left and right images are in the left and right eyes of the corresponding viewer. It is driven and controlled.

  Further, when viewing a flat image, the second opening / closing pattern of the left-eye shutter 125L and the right-eye shutter 125R is switched. In the case of this second opening / closing pattern, for example, at the timing when the left-eye image is displayed on the stereoscopic image display device 110, the right-eye image is displayed with the left and right shutters (125R, 125L) in the transmissive state. At the timing, the left and right shutters (125R, 125L) are set in an opaque state so that only one of the images enters both eyes. In this way, even if the left and right images are alternately displayed on the 3D image display device 110, the viewer is viewing only one side of the image, so that the 2D image can be viewed without stereoscopic viewing. Will be.

  In the above example, only the left-eye video is shown with both eyes, but only the right-eye video may be shown. If there is a reference image, the reference image may be viewed. For example, it is effective in the method of generating a video image of the other eye from the reference image and the parallax information and stereoscopically viewing it.

  As described above, the stereoscopic video display system 100 includes a stereoscopic video display device 110 that alternately displays a left-eye video and a right-eye video, a left-eye shutter 125L, and a right-eye shutter 125R. Ornamental glasses 120 are provided. The stereoscopic video display device 110 includes a synchronization signal transmission unit 113 that transmits a synchronization signal synchronized with the timing for alternately displaying the left-eye video and the right-eye video.

  The stereoscopic video viewing glasses 120 includes a synchronization signal transmitted from the synchronization signal transmission unit 113, a shutter drive control unit 124 that controls opening and closing driving of the left-eye shutter 125L and the right-eye shutter 125R, and a synchronization signal. A signal intensity determination unit 123 that determines the viewing distance between the stereoscopic image display device 110 and the stereoscopic image viewing glasses 120 by determining the signal intensity of the image signal, and the shutter drive control unit 124 is a signal intensity determination unit 123. In accordance with the determined viewing distance (signal strength), the left eye shutter 125L and the right eye shutter 125R are alternately opened and closed to display a stereoscopic image, and the left eye shutter 125L. Switch the second opening / closing pattern to display the planar image by simultaneously opening / closing the right-eye shutter 125R. That.

  The determination of the viewing distance and the shutter drive control will be specifically described with reference to FIG. FIG. 2 simply shows a situation where two viewers (viewer X and viewer Y) are watching at a certain viewing distance. 2A shows a state where the viewer X is viewing at a viewing distance L, and FIG. 2B shows a state where the viewer Y is viewing at a viewing distance L ′. However, although two states are illustrated separately for easy understanding, in FIGS. 2A and 2B, the same image is viewed on the same stereoscopic image display device 110. And

  The stereoscopic video display device 110 alternately displays left and right videos at high speed, and the stereoscopic video viewing glasses 120 worn by the viewer are driven so as to be synchronized therewith. First, a state in which stereoscopic video is viewed from the position of the viewer X shown in FIG. The viewer X wears the stereoscopic video viewing glasses 120 at the position of the viewing distance L and views the stereoscopic video display device 110. At this time, the stereoscopic video display device 110 displays the left and right videos in a time-sharing manner, and the stereoscopic video viewing glasses 120 are driven and controlled in accordance with the timing, so that the viewer X can view the stereoscopic video.

  Here, the feature points of the same target in the corresponding left and right images on the stereoscopic image display device 110 are defined as a left image feature point 311L and a right image feature point 311R. The interval on the display of these two feature points is the parallax amount 312. When the left image feature point 311L and the right image feature point 311R corresponding to the left and right images are observed with the left eye 314L and the right eye 314R of the viewer X, respectively, and stereoscopically viewed, the two feature points overlap to form an image point. 313 appears to exist. The position of the image formation point 313, that is, how far it appears (retracted) from the display surface depends on the distance 315 between the eyes of the viewer, the viewing distance L, and the amount of parallax 312. When the position is fixed, the pop-out amount increases as the parallax amount 312 increases.

Here, the angle at which the left eye 314L and the right eye 314R, which are the positions of the left and right eyes of the viewer, and the left video feature point 311L and the right video feature point 311R corresponding to the left and right images are respectively represented by line segments is represented by the convergence angle. Assuming that α is the convergence angle β and the angle represented by the center position of the two feature points and the line segment connecting the left eye 314L and the right eye 314R is, the parallax angle a is
Parallax angle a = | α−β |
Can be defined as If this parallax angle is too large, stereoscopic viewing cannot be achieved beyond the fusion limit, which is the amount of parallax that can be viewed stereoscopically (looks like a double image), or discomfort or eye strain during long-time viewing. Therefore, it is necessary to suppress the viewing of video with an excessive amount of parallax. Generally, the maximum parallax angle at the fusion limit is said to be 2 degrees, and the display is performed with a parallax amount that does not exceed the parallax angle any more. Furthermore, it is said that the optimum range is preferably 60 minutes or less.

FIG. 2B shows a case where the viewer Y views at a distance L ′ closer to the stereoscopic video display device 110 than the viewing distance L. This shows a state in which the amount of parallax on the display surface is the same as in FIG. 2A and only the viewing distance is shortened. Further, it is assumed that the distance between eyes 315 of the viewer X and the viewer Y is the same. In this case, the angles corresponding to the convergence angle α and the convergence angle β in FIG. 2A are the convergence angle α ′ and the convergence angle β ′, respectively, and the parallax angle b in the viewer Y is
Parallax angle b = | α′−β ′ |
It becomes. Here, since the parallax angle a <the parallax angle b, the parallax angle increases as the viewing distance decreases as long as the display parallax amount is the same.

  Here, the operation of the system of this embodiment will be described using specific numerical values. In the example of FIGS. 2A and 2B, the parallax amount 312 on the display of the displayed video is “15 mm”, the viewer's eye gap 315 is “65 mm”, the viewing distance L is “4 m”, and the viewing distance. When L ′ is “1 m”, the parallax angles a and b are the parallax angle a = 1.1 degrees (viewing distance L = 4 m) and the parallax angle b = 3.8 degrees (viewing distance L ′ = 1 m), respectively. It becomes. Since the parallax angle a is not a value that is particularly problematic for stereoscopic viewing, the first opening / closing pattern is set so that the viewer X views the left and right images with the left and right eyes so that the viewer can view the stereoscopic video. Shutter drive control by.

  On the other hand, the parallax angle b of the viewer Y exceeds the maximum parallax angle of 2 degrees, which is the limit of fusion, and stereoscopic viewing is impossible or causes eye strain. Then, a shutter control signal for switching the left and right shutters to the second opening / closing pattern that drives the viewer Y so that only the video for the left eye is shown to the viewer Y is generated in accordance with the display timing of the left and right images. That is, although the stereoscopic video display device 110 displays the left and right videos alternately, both the shutters (125L, 125R) of the stereoscopic video viewing glasses 120 are set to the transmission and non-transmission states simultaneously on the left and right. As a result, the viewer views only the left video with both eyes, and thus the viewer views the flat video (two-dimensional video).

  Here, a method of visual distance determination by the signal strength determination unit 123 will be described. As described above, whether to display a stereoscopic image or a planar image is determined based on the viewing distance, but this is performed by the signal strength determination unit 123. Based on the determination result by the signal strength determination unit 123, the shutter control signal generation unit 122 and the shutter drive control unit 124 switch the open / close pattern of the left and right shutters so that the viewer can view a stereoscopic video or a planar video. Control whether to watch.

  The signal strength determination unit 123 determines the viewing distance based on the light intensity of the infrared signal 114 received by the synchronization signal reception unit 121. FIG. 3 is a diagram showing an example of characteristic curve data representing the transition of the intensity of infrared light with respect to the viewing distance. In the figure, the vertical axis represents the infrared light intensity (relative reception level: dB), and the horizontal axis represents the viewing distance ( m). The characteristic curve data shown in FIG. 3 is stored in a memory (not shown) of the stereoscopic video viewing glasses 120 and is referred to by the signal strength determination unit 123. According to this, it can be seen that the signal intensity of infrared light attenuates as the viewing distance increases. For example, the infrared light intensity (relative reception level) P corresponding to the viewing distance L0 where the parallax angle is 1 degree is set as the reference value. Here, since the light intensity at the viewing distance L (> L0) of the viewer X is equal to or less than the reference value P, the viewing distance determination unit 123 determines the determination value for allowing stereoscopic viewing as the shutter control signal generation unit 122. The shutter control signal generator 122 generates a shutter control signal so that the left and right images are viewed with the left and right eyes. Then, based on the shutter control signal, the shutter drive control unit 124 drives the left and right shutters with the first opening / closing pattern. As a result, the viewer X views the stereoscopic video.

  On the other hand, in the case of the viewer Y, the value of the light intensity at the viewing distance L ′ (<L0) exceeds the reference value P, and it can be seen that the viewer Y is viewing at a viewing distance equal to or greater than the fusion limit. That is, the signal strength determination unit 123 determines whether or not the viewing distance between the stereoscopic video display device 110 and the stereoscopic video viewing glasses 120 is smaller than a predetermined threshold (here, corresponding to L0), and determines that the visual distance is small. The shutter drive control unit 124 switches to the second opening / closing pattern and displays a planar image. Note that when the signal intensity is used as a threshold reference, the signal intensity increases as the viewing distance becomes shorter. Therefore, when it is determined that the signal intensity is larger than the threshold, the shutter drive control unit 124 switches to the second opening / closing pattern. A plane image is displayed.

  More specifically, the signal strength determination unit 123 sends a determination value that does not permit stereoscopic viewing (views a flat image) to the shutter control signal generation unit 122, and the shutter control signal generation unit 122 converts the determination value into a left-eye image. On the other hand, a shutter control signal is generated so as to be viewed simultaneously with the left and right eyes. Based on the shutter control signal, the shutter drive control unit 124 drives the left and right shutters with the second opening / closing pattern. As a result, the viewer Y views only the image for the left eye, and views the planar image.

  In the present embodiment, only the left-eye video is shown when viewing the planar video, but only the right-eye video may be displayed. Further, even when displaying a multi-view video, a flat video may be obtained by viewing a video in a specific viewpoint direction. For example, in the case of a stereoscopic video display apparatus that displays videos of three or more viewpoints in a time-sharing manner and selects two viewpoints for stereoscopic viewing, only one viewpoint video may be selected and viewed as a planar video.

  In this way, the viewing distance is determined based on the intensity of the infrared signal light, and the shutter opening / closing pattern is automatically changed (switched), so that no complicated operation is required, and other viewers can view stereoscopically. Without obstructing, it is possible to prevent a stereoscopic image exceeding the fusion limit and a strong parallax image that causes eye strain from being displayed.

  In this embodiment, the sync signal is an infrared signal. However, the present invention is not limited to this, and other sync signals such as other optical signals and radio waves may be used. Since these signals are attenuated in accordance with the distance from the synchronization signal transmission unit in the same manner as the infrared signal, the viewing distance can be determined by the change in the signal intensity when received.

  In this embodiment, the determination is based on the viewing distance. However, the determination is not limited to this, and the determination may be made based on a change in received signal strength. For example, it may be determined how much the received signal intensity is attenuated based on the signal intensity at the recommended viewing distance, and the shutter drive pattern of the glasses is switched.

  The stereoscopic video viewing glasses described in the above embodiments are controlled by the stereoscopic video viewing glasses that are individually worn by the viewers. Therefore, even in an environment where multiple people view, viewing with a short viewing distance is possible. Only the viewer can view the flat image, and the other viewers can enjoy the stereoscopic image. In addition, since the video itself is not matched with a specific target person, everyone can view the stereoscopic video comfortably.

  Furthermore, since a large-scale device configuration is unnecessary and can be realized only by providing a simple function to the glasses for viewing stereoscopic images, it is possible to prevent eye strain of the viewer while reducing the device cost. it can.

  In addition, since it is possible to control the presence / absence of stereoscopic display for each viewer without obstructing stereoscopic display even when a plurality of people are viewing, this is effective even in an environment where there are three or more viewers. In addition, when a certain viewer moves to a place near the viewing distance, the display is automatically switched from 3D to 2D based on the comparison result between the viewing distance and a preset threshold. Is possible.

  The threshold value for the viewing distance is not limited to the value in the above-described embodiment (FIG. 3), and can be set by the user, and manual adjustment may be performed. In this case, it is possible to set according to individual differences by setting different thresholds for each viewer. For example, since the distance between both eyes is shorter than that of an adult in the case of a child, when viewing an image with the same amount of parallax, the parallax angle becomes larger when the distance between both eyes is shorter even at the same viewing distance. For this reason, in the case of a child, more effective stereoscopic image display control can be performed by setting the threshold value larger than that in the case of an adult.

  Further, as the stereoscopic video viewing glasses, liquid crystal is used for the left and right shutters, but the present invention is not limited to this, and any shutter that can control transmission and non-transmission in synchronization with the video may be used.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design and the like within the scope not departing from the gist of the present invention are also included. Included in scope.

DESCRIPTION OF SYMBOLS 100,100 '... Stereoscopic video display system, 110 ... Stereoscopic video display apparatus, 111 ... Video display part, 112 ... Video | video identification signal generation part, 113 ... Infrared signal transmission part, 114 ... Infrared signal, 115 ... Parallax amount determination part, DESCRIPTION OF SYMBOLS 120 ... Glasses for 3D image viewing, 121 ... Infrared signal receiving part, 122 ... Shutter control signal generation part, 123 ... Signal strength determination part, 124 ... Shutter drive control part, 125R ... Shutter for right eye, 125L ... Shutter for left eye 311R: Right video feature point, 311L: Left video feature point, 312 ... Parallax amount, 313 ... Imaging point, 314R ... Right eye, 314L ... Left eye, 315 ... Binocular interval.

Claims (7)

Stereoscopic video viewing glasses for viewing stereoscopic video by a stereoscopic video display device that alternately displays left-eye video and right-eye video and transmits a synchronization signal synchronized with the display timing,
The stereoscopic video viewing glasses include a left-eye shutter and a right-eye shutter, a shutter drive control unit that controls opening and closing driving of the left-eye shutter and the right-eye shutter according to the synchronization signal, and the synchronization signal. A signal strength determination unit for determining the signal strength of
The shutter drive control unit is configured to first open and close the left eye shutter and the right eye shutter to open and close to display a stereoscopic image according to the signal strength determined by the signal strength determination unit. 3D image viewing glasses characterized by switching between a pattern and a second opening / closing pattern for simultaneously opening and closing the left-eye shutter and the right-eye shutter to display a planar image.   The signal strength determination unit determines a viewing distance between the stereoscopic video display device and the stereoscopic video viewing glasses based on a signal strength of a synchronization signal transmitted from the stereoscopic video display device. 3D image viewing glasses as described in 1.   The synchronization signal is an infrared signal, and the signal intensity determination unit displays a stereoscopic image by alternately opening and closing the left-eye shutter and the right-eye shutter according to the light intensity of the infrared signal. The first opening / closing pattern and a second opening / closing pattern for simultaneously displaying the planar image by driving the left-eye shutter and the right-eye shutter to open and close are switched. Glasses for viewing 3D images.   The synchronization signal is a radio wave signal, and the signal strength determination unit displays a stereoscopic image by alternately opening and closing the left-eye shutter and the right-eye shutter according to the signal strength of the radio signal. The first opening / closing pattern and a second opening / closing pattern for simultaneously displaying the planar image by driving the left-eye shutter and the right-eye shutter to open and close are switched. Glasses for viewing 3D images.   The signal strength determination unit determines whether or not the signal strength of the synchronization signal is smaller than a predetermined threshold value. If the signal strength determination unit determines that the signal strength is larger, the shutter drive control unit switches to the second opening / closing pattern to The stereoscopic image viewing glasses according to any one of claims 1 to 4, wherein an image is displayed.   The stereoscopic video viewing glasses according to claim 5, wherein the predetermined threshold is set according to a viewing distance between the stereoscopic video display device and the stereoscopic video viewing glasses.   The stereoscopic video viewing glasses according to claim 5, wherein the predetermined threshold value can be set by a user.

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