Patent Description:
A stereoscopic video display device that has been proposed recently displays a stereoscopic image as if the stereoscopic image is floating in the air and enables observation of a stereoscopic video from around the stereoscopic video display device, due to advancement of high speed CPUs. For example, a screen having a planar shape is arranged inside a transparent case having a cylindrical shape and a video is displayed on the screen. A nearby observer is tracked, the screen is rotated to face the observer at a position, and a video on the screen is changed to a video that is seen according to the position of the observer. Such a stereoscopic video display device is described in, for example, <CIT>.

<CIT> relates to an apparatus for generating a stereo three dimensional image intermixed with a real object, the apparatus having a display device with a display surface for generating stereo images rendered by a computer means, the stereo images corresponding to a virtual coordinate space, the computer means generating a z buffer indicating three dimensional positioning for the real object and the virtual object within the virtual coordinate space, reflector means positioned to transmit the stereo images to the eyes of a viewer, the reflector means further transmitting light reflected from the real object to the eyes of the viewer and means for selectively blocking transmission of the light reflected from the real object to the eyes of the viewer.

A screen in a conventional stereoscopic video display device rotates according to a position of an observer, a video according to the position of the observer is displayed on the screen, and the observer is able to see a stereoscopic video over a range of <NUM> degrees. However, when the observer moves around the stereoscopic display device, the video of the displayed object projected on the screen is changed, but the image of the background of the displayed object is not changed. Therefore, there is a problem that the video of the displayed object displayed over the background does not look right to the observer.

The present disclosure is made in view of the above and an object thereof is to display a stereoscopic video that does not look wrong to an observer.

To solve the above problem and achieve the object, a stereoscopic video display device, a stereoscopic video display method and a program according to the appended claims are provided. The device inter alia includes: an image display unit configured to display an image; an observer position detection unit configured to detect a position of a nearby observer; a rendering unit configured to form an image of a virtual object corresponding to the position of the observer detected by the observer position detection unit; a rotation unit configured to rotate the image display unit to a position facing the observer detected by the observer position detection unit; a background image obtainment unit configured to obtain an image of a background behind the image display unit; and an image composition processing unit configured to generate a composite image in which the image of the virtual object formed by the rendering unit is superimposed on the image of the background obtained by the background image obtainment unit, and display the composite image on the image display unit.

The stereoscopic video display method inter alia includes the steps of: detecting a position of a nearby observer; forming an image of a virtual object corresponding to the position of the observer; rotating to a position facing the observer an image display unit configured to display an image; obtaining an image of a background behind the image display unit; and generating a composite image in which the image of the virtual object is superimposed on the image of the background, and displaying the composite image on the image display unit.

The program inter alia causes a computer to execute the steps of: detecting a position of a nearby observer; forming an image of a virtual object corresponding to the position of the observer; rotating to a position facing the observer an image display unit configured to display an image; obtaining an image of a background behind the image display unit; and generating a composite image in which the image of the virtual object is superimposed on the image of the background, and displaying the composite image on the image display unit. Advantageous Effects of Invention.

According to the present disclosure, an effect is achieved, the effect being an effect enabling display of a stereoscopic video that does not look wrong to an observer.

Embodiments of a stereoscopic video display device, a stereoscopic video display method, and a program, according to the present disclosure will hereinafter be described in detail by reference to the appended drawings. The present invention is not limited by the following embodiments.

<FIG> is a perspective view of a stereoscopic video display device according to a first embodiment, <FIG> is a vertical sectional view of the stereoscopic video display device, and <FIG> is a plan view of stereoscopic video display.

In this first embodiment, as illustrated in <FIG>, a stereoscopic video display device (stereoscopic video display unit) <NUM> includes a case <NUM>, a display (image display device (image display unit)) <NUM>, a turntable (table rotation device (table unit)) <NUM>, a turntable drive device (rotation device (rotation unit)) <NUM>, and cameras (background image obtainment devices (background image obtainment units)) <NUM>.

The case <NUM> has a hollow cylindrical shape. The case <NUM> has a ceiling portion <NUM>, a cylinder portion <NUM>, and a bottom portion <NUM>. The ceiling portion <NUM> and the bottom portion <NUM> are disk-shaped and are fixed to a top portion and a bottom portion of the cylinder portion <NUM> having a cylindrical shape. The ceiling portion <NUM> is transparent. The cylinder portion <NUM> has a transparent portion 22a at the top and a non-transparent portion 22b at the bottom. The bottom portion <NUM> is non-transparent.

The turntable <NUM> has a disk shape. The turntable <NUM> is arranged between the transparent portion 22a and the non-transparent portion 22b of the cylinder portion <NUM>, inside the case <NUM>. The turntable <NUM> is arranged horizontally, and is supported to be horizontally rotatable, relatively to the case <NUM>, about a pivot point at a center O.

The display <NUM> is a liquid crystal display having a planar shape. The display <NUM> is capable of displaying an image. The display <NUM> has a rectangular shape and is arranged along a direction orthogonal to the top of the turntable <NUM>. The display <NUM> is arranged along a radial direction so as to pass through the center O of the turntable <NUM>. The display <NUM> is arranged in the transparent portion 22a of the cylinder portion <NUM>, inside the case <NUM>. An observer is thus able to see an image displayed on the display <NUM>, through the transparent portion 22a, from outside the case <NUM>.

The turntable drive device <NUM> is fixed to an upper surface of the bottom portion <NUM> inside the case <NUM>. The turntable drive device <NUM> has, for example, a motor and a speed reducer, and has an output shaft <NUM> along the center O of the case <NUM>. The output shaft <NUM> of the turntable drive device <NUM> is coupled to the turntable <NUM>. Therefore, driving the turntable drive device <NUM> enables rotation of the turntable <NUM> in a normal rotation direction and a counter rotation direction. Rotation of the turntable <NUM> enables rotation of the display <NUM> on the turntable <NUM>.

The cameras <NUM> are fixed to an upper portion of the outer periphery of the case <NUM>. The number of the cameras <NUM> arranged is plural (four in this embodiment). However, the number of the cameras <NUM> is not limited to four. The cameras <NUM> are arranged on the case <NUM> at predetermined intervals (preferably, equal intervals) in a circumferential direction. The cameras <NUM> are capable of capturing an image outside the case <NUM>. In this embodiment, arranging the four cameras <NUM> on the case <NUM> enables imaging over the entire range (<NUM> degrees) outside and around the case <NUM>. The cameras <NUM> are capable of capturing and obtaining images of an observer near the case <NUM> (display <NUM>) and a background image.

<FIG> is a block diagram illustrating a control system of the stereoscopic video display device.

As illustrated in <FIG>, the stereoscopic video display device <NUM> includes, in addition to the case <NUM> (see <FIG>), the display <NUM>, the turntable <NUM>, the turntable drive device <NUM>, and the cameras <NUM>: an image processing device (image processing unit) <NUM>; a face position detection device (observer position detection device (observer position detection unit)) <NUM>; a rendering device (rendering unit) <NUM>; a background image processing device (background image processing unit) <NUM>; an image composition processing device (image composition processing unit) <NUM>; and a turntable control device (rotation control device (rotation control unit)) <NUM>. The plural cameras <NUM> transmit images that have been captured by the plural cameras <NUM>, to the image processing device <NUM>.

By compositing the images captured by the plural cameras <NUM>, the image processing device <NUM> generates a continuous all-around image of the entire range (<NUM> degrees) outside and around the stereoscopic video display device <NUM>, the all-around image being continuous. The image processing device <NUM> transmits the all-around image to the face position detection device <NUM> and the background image processing device <NUM>. The face position detection device <NUM> detects a position of an observer near the stereoscopic video display device <NUM>. In this case, the face position detection device <NUM> detects, on the basis of the all-around image generated by the image processing device <NUM>, the face and eyes of the observer by a technique, such as machine learning, and determines the position of the observer. For example, the face position detection device <NUM> determines the position of the observer, as an angle to a reference angle. The face position detection device <NUM> transmits the detected position of the observer, to the rendering device <NUM>, the background image processing device <NUM>, and the turntable control device <NUM>.

The rendering device <NUM> forms an image of a virtual object according to the position of the observer, the position having been detected by the face position detection device <NUM>. The rendering device <NUM> generates the image of the virtual object as a stereoscopic image (3DCG) and displays the image on the display <NUM>. In generating the image, the rendering device <NUM> performs rendering such that the image of the virtual object displayed on the display <NUM> becomes an image according to a viewpoint of the observer. For example, when the observer is at a reference position, the rendering device <NUM> generates a front image of the virtual object and displays the front image on the display <NUM>. When the observer is at a position that is shifted from the reference position by <NUM> degrees in the circumferential direction, the rendering device <NUM> generates a lateral image of the virtual object and displays the lateral image on the display <NUM>. The rendering device <NUM> transmits the image of the virtual object, to the image composition processing device <NUM>.

The background image processing device <NUM> obtains an image of a background behind the display <NUM>. The background image processing device <NUM> obtains the image of the background behind the display <NUM> by cutting out the image from the all-around image generated by the image processing device <NUM>. The background image processing device <NUM> transmits the image of the background behind the display <NUM>, to the image composition processing device <NUM>.

The image composition processing device <NUM> generates a composite image in which the image of the virtual object formed by the rendering device <NUM> is superimposed on the image of the background obtained by the background image processing device <NUM>, and transmits the generated image of the virtual object and image of the background to the display <NUM>. The display <NUM> displays the virtual object and the image of the background.

The turntable control device <NUM> generates a control signal to cause the display <NUM> to face the observer at the position detected by the face position detection device <NUM>, and transmits the control signal to the turntable <NUM>. The turntable <NUM> rotates on the basis of the control signal obtained.

The image processing device <NUM>, the face position detection device <NUM>, the rendering device <NUM>, the background image processing device <NUM>, the image composition processing device <NUM>, and the turntable control device <NUM> include all or at least one of a central processing unit (CPU), a random access memory (RAM), and a read only memory (ROM). Furthermore, the image processing device <NUM>, the face position detection device <NUM>, the rendering device <NUM>, the background image processing device <NUM>, the image composition processing device <NUM>, and the turntable control device <NUM> may be integral with one another or may each be separately bodied. The image processing device <NUM>, the face position detection device <NUM>, the rendering device <NUM>, the background image processing device <NUM>, and the image composition processing device <NUM> are included and equipped in the turntable drive device <NUM>, for example, but may each be included and equipped in any of the case <NUM>, the display <NUM>, the turntable <NUM>, the turntable drive device <NUM>, and the cameras <NUM>.

The following description is on a stereoscopic video display method by the stereoscopic video display device <NUM>. <FIG> is a diagram illustrating operation of the stereoscopic video display device, <FIG> is a schematic diagram illustrating stereoscopic video display ranges according to positions of an observer, and <FIG> is a schematic diagram illustrating stereoscopic video display according to the positions of the observer.

The stereoscopic video display method of the first embodiment includes a step of detecting a position of an observer near the display <NUM>, a step of forming an image of a virtual object according to the position of the observer, a step of rotating the display <NUM> to cause the display <NUM> to be opposed to the position of the observer, a step of obtaining an image of a background behind the display <NUM>, and a step of generating a composite image in which the image of the virtual object is superimposed on the image of the background and displaying the composite image on the display <NUM>, the image of the virtual object being in front of the image of the background.

As illustrated in <FIG> and <FIG>, the plural cameras <NUM> capture images of the entire range outside the stereoscopic video display device <NUM>. By compositing the images captured by the plural cameras <NUM>, the image processing device <NUM> generates a continuous all-around image of the entire range outside the stereoscopic video display device <NUM>. On the basis of the all-around image resulting from the composition by the image processing device <NUM>, the face position detection device <NUM> detects a position of the observer. When an observer A is at a position Aa, the face position detection device <NUM> determines the position Aa as an angle to a reference position. For example, if the position Aa is the reference position, the position Aa of the observer A is determined as an angle θ0.

The turntable control device <NUM> rotates the turntable <NUM> and causes the display <NUM> to move, so that the display <NUM> faces the observer at the position Aa, the position Aa having been detected by the face position detection device <NUM>. The rendering device <NUM> forms an image of a virtual object according to the position Aa of the observer, the position Aa having been detected by the face position detection device <NUM>. For example, the rendering device <NUM> forms a front image of the virtual object. Furthermore, the background image processing device <NUM> obtains an image of a background behind a display 12a by cutting out the image from the all-around continuous image resulting from the composition by the image processing device <NUM>. The image composition processing device <NUM> then generates a composite image in which the image of the virtual object formed by the rendering device <NUM> is superimposed on the image of the background obtained by the background image processing device <NUM>, and causes the display 12a to display the generated composite image of the image of the virtual object and the image of the background.

In response to movement of the observer A from the position Aa to a position Ab, the face position detection device <NUM> determines the position Ab of the observer A as an angle θb, with the position Aa serving as the reference position, for example. The turntable control device <NUM> rotates the turntable <NUM> by the angle θb and causes a display 12b to move, so that the display <NUM> faces the observer at the position Ab detected by the face position detection device <NUM>. The rendering device <NUM> forms an image of a virtual object according to the position Ab of the observer detected by the face position detection device <NUM>. For example, the rendering device <NUM> forms a diagonally right image of the virtual object. Furthermore, the background image processing device <NUM> obtains an image of a background behind the display 12b by cutting out the image from the all-around continuous image resulting from the composition by the image processing device <NUM>. The image composition processing device <NUM> then generates a composite image in which the image of the virtual object formed by the rendering device <NUM> is superimposed on the image of the background obtained by the background image processing device <NUM>, and causes the display 12b to display the generated composite image of the image of the virtual object and the image of the background.

In response to movement of the observer A from the position Aa to a position Ac, on the other hand, the face position detection device <NUM> determines the position Ac of the observer A as an angle θc, with the position Aa serving as the reference position, for example. The turntable control device <NUM> rotates the turntable <NUM> by the angle θc and causes a display 12c to move, so that the display <NUM> faces the observer at the position Ac detected by the face position detection device <NUM>. The rendering device <NUM> forms an image of a virtual object according to the position Ac of the observer detected by the face position detection device <NUM>. For example, the rendering device <NUM> forms a diagonally left image of the virtual object. Furthermore, the background image processing device <NUM> obtains an image of a background behind the display 12c by cutting out the image from the all-around continuous image resulting from the composition by the image processing device <NUM>. The image composition processing device <NUM> then generates a composite image in which the image of the virtual object formed by the rendering device <NUM> is superimposed on the image of the background obtained by the background image processing device <NUM>, and causes the display 12c to display the generated composite image of the image of the virtual object and the image of the background.

As illustrated in (a) of <FIG>, when the observer A is at the position Aa, the display <NUM> is moved to the display 12a so that the display <NUM> faces the observer A at the position Aa. The rendering device <NUM> forms a front image of a virtual object <NUM> according to the position Aa of the observer. The background image processing device <NUM> obtains an image of a background (for example, a television <NUM>) behind the display 12a by cutting out the image. As illustrated in (a) of <FIG>, the image composition processing device <NUM> generates a composite image in which an image of a center portion of the television <NUM> is superimposed behind the front image of the virtual object <NUM>, and causes the display 12a to display the composite image.

As illustrated in (b) of <FIG>, when the observer A is at the position Ab, the display <NUM> is moved to the display 12b so that the display <NUM> faces the observer A at the position Ab. The rendering device <NUM> forms a diagonally left image of the virtual object <NUM> according to the position Ab of the observer. The background image processing device <NUM> obtains an image of a background (for example, the television <NUM>) behind the display 12b by cutting out the image. As illustrated in (b) of <FIG>, the image composition processing device <NUM> generates a composite image in which an image of a left portion of the television <NUM> is superimposed behind the diagonally left image of the virtual object <NUM>, and causes the display 12b to display the composite image.

Furthermore, as illustrated in (c) of <FIG>, when the observer A is at the position Ac, the display <NUM> is moved to the display 12c so that the display <NUM> faces the observer A at the position Ac. The rendering device <NUM> forms a diagonally right image of the virtual object <NUM> according to the position Ac of the observer. The background image processing device <NUM> obtains an image of a background (for example, the television <NUM>) behind the display 12c by cutting out the image. As illustrated in (c) of <FIG>, the image composition processing device <NUM> generates a composite image in which an image of a right portion of the television <NUM> is superimposed behind the diagonally right image of the virtual object <NUM>, and causes the display 12c to display the composite image.

<FIG> is a block diagram illustrating a control system of a stereoscopic video display device according to a second embodiment, and <FIG> is a diagram illustrating stereoscopic video display according to positions of an observer. The same reference signs will be assigned to members having functions similar to those of the first embodiment described above, and detailed description thereof will be omitted.

In this second embodiment, as illustrated in <FIG>, a stereoscopic video display device 10A includes a case <NUM> (see <FIG>), a display <NUM>, a turntable <NUM>, a turntable drive device <NUM>, cameras <NUM>, an image processing device <NUM>, a face position detection device <NUM>, a rendering device <NUM>, a background image processing device <NUM>, an image composition processing device <NUM>, a turntable control device <NUM>, and a turntable position detection device (rotational position detection device) <NUM>. The turntable control device <NUM> transmits control signals to the turntable position detection device <NUM>.

The case <NUM>, the display <NUM>, the turntable <NUM>, the turntable drive device <NUM>, the cameras <NUM>, the image processing device <NUM>, the face position detection device <NUM>, and the turntable control device <NUM> are similar to those of the first embodiment and description thereof will thus be omitted.

The turntable position detection device <NUM> detects, on the basis of a control signal from the turntable control device <NUM>, a position of the turntable <NUM>, that is, a rotational position of the display <NUM> integral with the turntable <NUM>. The turntable position detection device <NUM> may calculate the position of the turntable <NUM> from a motor rotation rate at the turntable drive device <NUM>, or directly detect a rotational position of the turntable <NUM>.

The turntable position detection device <NUM> detects an actual rotational position of the turntable <NUM>. That is, as illustrated in <FIG> and <FIG>, in response to movement of an observer A from a position Aa to a position Ae, the turntable control device <NUM> controls driving of the turntable drive device <NUM>, rotates the turntable <NUM> to a predetermined position that is a position of a display 12e, so that the display <NUM> faces the observer A at the position Ae. If the observer A moves from the position Aa to the position Ae quickly then, the display <NUM> moves to the display 12e belatedly due to delay in control by the turntable control device <NUM> and time for driving the turntable drive device <NUM>. That is, when the observer A reaches the position Ae, the display <NUM> is still at a position of a display 12d facing the observer A at a position Ad. The turntable position detection device <NUM> transmits an actual rotational position of the turntable <NUM> to the rendering device <NUM>.

Therefore, in this second embodiment, when the display <NUM> is still at the position of the display 12d even though the observer A has reached the position Ae, the rendering device <NUM> forms an image of a virtual object corresponding to the actual rotational position of the turntable <NUM> detected by the turntable position detection device <NUM>, that is, the actual position of the display 12d. Furthermore, the background image processing device <NUM> also obtains an image of a background behind the display 12d by cutting out the image, according to the actual rotational position of the turntable <NUM>, that is, the actual position of the display 12d. The image composition processing device <NUM> generates a composite image in which the image of the background is superimposed behind the image of the virtual object <NUM>, and causes the display 12d to display the composite image.

Thereafter, in response to the turntable <NUM> rotating and the display <NUM> reaching the position of the display 12e facing the observer A at the position Ae, the rendering device <NUM> forms an image of a virtual object corresponding to the position of the display 12e, and the background image processing device <NUM> obtains an image of a background behind the display 12e by cutting out the image. The image composition processing device <NUM> generates a composite image in which the image of the background is superimposed behind the image of the virtual object <NUM>, and causes the display 12e to display the composite image.

The turntable position detection device <NUM> includes all or at least one of a central processing unit (CPU), a random access memory (RAM), and a read only memory (ROM). Furthermore, the turntable position detection device <NUM> may be integral with the image processing device <NUM>, the face position detection device <NUM>, the rendering device <NUM>, the background image processing device <NUM>, the image composition processing device <NUM>, and/or the turntable control device <NUM>, or these may each be separately bodied. The turntable position detection device <NUM> is included and equipped in the turntable drive device <NUM>, for example, but may be included and equipped in any one of the case <NUM>, the display <NUM>, the turntable <NUM>, the turntable drive device <NUM>, and the cameras <NUM>.

<FIG> is a diagram illustrating a modified example of the stereoscopic video display according to positions of an observer, at the stereoscopic video display device according to the second embodiment.

As illustrated in <FIG> and <FIG>, the turntable control device <NUM> rotates the turntable <NUM> so that the display <NUM> faces an observer at a position detected by the face position detection device <NUM>. For this rotation, when an observer A has moved in a predetermined time period that has been set beforehand by an angle larger than an angle θb or θc to a position detected by the face position detection device <NUM>, the turntable control device <NUM> rotates the turntable <NUM> and the display <NUM> so that the display <NUM> faces the observer A at the position.

If the display <NUM> is rotated every time the observer A has moved by a small amount, the turntable drive device <NUM> will rotate the turntable <NUM> frequently, sound of a motor being driven is generated at all times, and the observer A is likely to sense the sound of the motor being driven as noise. Therefore, the turntable control device <NUM> does not rotate the turntable <NUM> when the observer A moves to a position within the angle θb or θc. However, the rendering device <NUM> forms an image of a virtual object corresponding to a position to which the observer A has moved by a small amount, and the background image processing device <NUM> obtains an image of a background behind a display 12e corresponding to the position to which the observer A has moved by the small amount, by cutting out the image. The image composition processing device <NUM> generates a composite image in which the image of the background is superimposed behind the image of the virtual object <NUM>, and causes the display 12e to display the composite image.

The turntable control device <NUM> may rotate the turntable <NUM> when the observer A is moving to a position within the angle θb or θc by exceeding the predetermined time period that has been set beforehand, the position having been detected by the face position detection device <NUM>. That is, in a state where the turntable <NUM> has stopped and the observer A is moving within the angle θb or θc, the turntable <NUM> may be rotated so that the display <NUM> faces the observer A if the predetermined time period has elapsed since the stoppage of the turntable <NUM>.

Furthermore, an upper limit is preferably set for rotational speed of the turntable <NUM> by the turntable control device <NUM>. Rotating the turntable <NUM> at a low speed enables reduction of generation of large noise of the motor being driven, reduction of rotational vibration of the turntable <NUM>, and reduction of electric power consumed for driving.

Included in the embodiment are the display <NUM> (image display unit) that displays an image, the face position detection device (observer position detection unit) <NUM> that detects a position of a nearby observer, the rendering device <NUM> that forms an image of a virtual object corresponding to the position of the observer detected by the face position detection device <NUM>, the turntable drive device <NUM> (rotation unit) that rotates the display <NUM> to a position facing the observer detected by the face position detection device <NUM>, the cameras (background image obtainment units) <NUM> that obtain images of backgrounds behind the display <NUM>, and the image composition processing unit device <NUM> that generates a composite image in which the image of the virtual object is superimposed on the image of the background and displays the composite image on the display <NUM>, the image of the virtual object being in front of the image of the background.

Therefore, the image of the virtual object <NUM> and the image of the background are able to be appropriately displayed on the display 12d according to the position of the observer. As a result, stereoscopic videos that do not look wrong to observers are able to be displayed.

In the embodiment, the turntable position detection device (rotational position detection unit) <NUM> that detects a rotational position of the display <NUM> is provided, the rendering device <NUM> forms an image of a virtual object corresponding to the rotational position detected by the turntable position detection device <NUM>, and the background image processing device <NUM> forms a background image corresponding to the rotational position detected by the rotational position detection device <NUM>. Therefore, even if there is a delay in movement of the display <NUM>, an appropriate image is able to be displayed at the display 12d.

In the embodiment, when an observer has moved to a position by an angle larger than a predetermined angle within a predetermined time period that has been set beforehand, the position having been detected by the face position detection device <NUM>, the turntable control device <NUM> rotates the display <NUM> to a position facing the observer. Therefore, not rotating the display <NUM> more than needed and reducing frequent generation of sound of the motor being driven in the turntable drive device <NUM> enable reduction of discomfort provided to the observer.

The stereoscopic video display device <NUM> according to the present disclosure has been described thus far, but implementation in various different modes other than the above-described embodiments is possible.

Each component of the stereoscopic video display device <NUM> has been functionally and/or conceptually illustrated in the drawings, and is not necessarily configured physically as illustrated in the drawings. That is, the specific form of each device is not limited to the one illustrated in the drawings, and all or a part of each device may be functionally or physically separated or integrated in any units according to, for example, the processing load on the device and the use situation of the device.

The configuration of the stereoscopic video display device <NUM> is, for example, implemented as software by programs loaded into a memory. With respect to the embodiments, functional blocks implemented by cooperation among these pieces of hardware or pieces of software have been described above. That is, these functional blocks may be implemented in any of various forms, by hardware only, software only, or a combination of hardware and software.

Furthermore, the basic configuration of the stereoscopic video display device <NUM> is not limited to the above-described embodiments. For example, the positions of the display <NUM>, turntable <NUM>, and turntable drive device <NUM> may be set as appropriate, the positions being relative to the case <NUM>. Furthermore, the turntable drive device <NUM> is capable of rotating the display <NUM> integral with the turntable <NUM>, by rotating the turntable <NUM>, but the turntable drive device <NUM> may be capable of directly rotating the display <NUM>.

Claim 1:
A stereoscopic video display device (<NUM>), comprising:
an image display unit (<NUM>) arranged inside a case (<NUM>) and configured to display an image;
an observer position detection unit (<NUM>) configured to detect a position of a nearby observer;
a rendering unit (<NUM>) configured to form an image of a virtual object corresponding to the position of the observer detected by the observer position detection unit (<NUM>) ;
a rotation unit (<NUM>) configured to rotate the image display unit (<NUM>) to a position facing the observer detected by the observer position detection unit (<NUM>);
a background image obtainment unit (<NUM>) comprising a plurality of cameras (<NUM>) configured to obtain an image of a background behind the image display unit (<NUM>), the cameras (<NUM>) being fixed to an upper position of an outer periphery of the case (<NUM>); and
an image composition processing unit (<NUM>) configured to generate a composite image in which the image of the virtual object formed by the rendering unit (<NUM>) is superimposed on the image of the background obtained by the background image obtainment unit (<NUM>), and display the composite image on the image display unit (<NUM>).