JP4013922B2 - Virtual reality generation apparatus and method - Google Patents

Description

  The present invention provides a virtual reality generation device that gives a virtual reality (virtual reality) to an observer by displaying a stereoscopic image with a wide viewing angle on a spherical screen with a concave surface facing the observer without distortion on a real scale. And methods.

  When giving the virtual reality (virtual reality) to an observer, an image must be displayed on a screen exceeding the maximum viewing angle of a person said to be 210 degrees in the horizontal direction and 110 degrees in the vertical direction, for example. Therefore, a virtual reality generation device using a spherical screen with a concave surface facing the observer has been proposed, which is impossible with a flat screen.

Among them, Patent Document 1 previously proposed by the present applicant not only corrects distortion for the spherical screen, but also when the projection means (projector) is installed in an offset state that is not on the center axis of the sphere. The correction is made so that an image without distortion is obtained. Therefore, even a relatively small spherical screen whose observer's viewpoint position is close to the central axis is highly convenient regardless of the installation position of the projection means.
Japanese Patent No. 3387487

  In the virtual reality generating device configured as described above, by adding the installation position correction as described above, the diameter of the spherical screen can be selected, and in particular, a small-diameter screen can be used. The installation conditions of the virtual reality generation device are eased and the application is widened. For example, in designing a city, a building, or a product, it is conceivable that the completion prediction is displayed three-dimensionally or used for driving simulation. As the application spreads in this way, the use of live-action images as well as 3D images created by dedicated image creation means such as CG (computer graphics) so far has made it more realistic. It is thought that the cost can be reduced.

  However, the live-action video is not created by a dedicated image creation means such as the CG, but is created using a general-purpose shooting means such as a video movie, so it is compressed and recorded on the medium. In many cases, if the image is reproduced as it is, there is a problem that a projection image from each projection means is deviated and difficult to see.

  An object of the present invention is to provide a virtual reality generation apparatus and method capable of accurately reproducing a stereoscopic image by accurately synthesizing a moving image such as a live-action image without deviation.

In order to achieve the above-mentioned object, the virtual reality generating apparatus according to the first means of the present invention has a spherical shape with a concave surface facing an observer, and is capable of displaying an image that is larger than the effective viewing angle of the observer. A screen with a viewing angle, a plurality of video creation means for creating a plurality of video signals viewed from different angles, and a video image based on each of the signals is projected onto the screen and combined with the observer for recognition. A projection unit that displays a stereoscopic video image by performing a synchronization management unit that executes a time management loop process and a synchronization management process, and controls each of the video creation units to establish synchronization between the signals and means, each image forming means, synchronization control section for performing synchronization management process, decompression unit for performing the movie file extraction process, playback display unit for performing an image display process and movies A distortion correction unit to perform distortion correction process, the compressed moving image file at each angle are sequentially decodes each converted into a signal of the moving picture, and decoding means for providing said projecting means, to said projection means Two frame memories that can be used by sequentially switching between outputting for decoding and writing decoded video signals, and the synchronization means obtains the current time in the time management loop process, and a specified time has elapsed In this case, the current time is distributed from the synchronization management process of the synchronization means to each of the decoding means, and the video display process receives the current time, and returns a receipt indicating reception to the synchronization means and the reference. update the time, it delivers the reference time to the movie file extraction process, the movie file extraction process The reference time is acquired and compared with the time at which the currently acquired frame is to be displayed. As a result, if the delay is within 2 frames, the frame data is updated, and the address in the frame buffer is set to the video display process. And the video display process is notified that the frame data has been updated . When the video display process receives the frame data update notification, it acquires the frame data from the address in the already notified frame buffer as video. The completion of frame data update is notified to the movie file decompression process, and the video is drawn on the one of the two frame memories provided in the video creation means that is not selected on the output side and the video call the distortion correction process to execute the process, the movie file solution The freeze process, upon receiving the frame data update completion notification, acquires the new frame data, the synchronization management process of the synchronization means, upon receiving the receipt, sends a swap synchronization message to the image display process, the video The display process executes swap of the two frame memories, returns a receipt to the synchronization management process of the synchronization means, and waits for reception of the current time again .

  Furthermore, the virtual reality generation method according to the second means of the present invention is a screen with a wide viewing angle capable of displaying an image larger than the effective viewing angle of the observer in a spherical shape with a concave surface facing the observer. In the virtual reality generation method of displaying a stereoscopic video image by projecting a plurality of video images viewed from different angles to each other and synthesizing and recognizing the same, an compressed video image file at each angle is displayed. Decode sequentially by decoding means that includes a synchronization management process, a movie file decompression process, a video display process and a video distortion correction process provided in the video creation means to convert the video into a video signal, a time management loop process, In establishing the synchronization between the signals by controlling the video creation means by the synchronization means executed including the synchronization management process, the time When the current time is acquired by the logical loop process and the specified time has elapsed, the current time is distributed from the synchronization management process of the synchronization means to each decoding means, and the video display process has received and received the current time Is sent back to the synchronization means and the reference time is updated, and the reference time is distributed to the movie file decompression process. The movie file decompression process acquires the reference time, and the current frame is acquired. Compare with the time to be displayed. As a result, if the delay is within 2 frames, the frame data is updated, the address in the frame buffer is notified to the video display process, and the frame data is updated to the video display process. The video display process notifies the frame data update notification. The frame data is acquired as an image from the address in the already notified frame buffer, the update of the frame data is notified to the movie file decompression process, and the image is stored in the two frame memories provided in the image creating means. The image file is drawn on the side not selected on the output side, and the video distortion correction process is called to execute the process. When the movie file decompression process receives the frame data update completion notification, it acquires new frame data. In the synchronization management process of the synchronization means, upon receipt of the receipt, a swap synchronization message is transmitted to the video display process. The video display process executes swap of the two frame memories, and the synchronization management process of the synchronization means Reply to the receipt and wait to receive the current time again.

  A virtual reality generation apparatus and method having such a configuration is a display apparatus that generates so-called virtual reality by projecting a plurality of moving image images viewed from different angles on a spherical screen and displaying a stereoscopic moving image image. In the above, the compressed moving image file at each angle is sequentially decoded and converted into the moving image signal, and the decoding process given to the projection means takes time and the required time varies depending on the image. In order to correct the variation, the synchronization means is provided, and the video creation means is controlled to establish synchronization between the signals of the moving picture.

  Therefore, it is possible to reproduce a stereoscopic image by accurately synthesizing a moving image such as the photographed image without deviation.

[Embodiment 1]
Embodiments according to the present invention will be described below with reference to the drawings. In addition, in each figure, the structure which attached | subjected the same code | symbol shows that it is the same structure, The description is abbreviate | omitted.

  FIG. 1 is a diagram showing an overall configuration of a virtual reality generation apparatus according to an embodiment of the present invention. This virtual reality generation device is roughly composed of a wide viewing angle screen 1, projectors 2 and 3 for projecting right-eye and left-eye images on the screen 1, and projections from the projectors 2 and 3, respectively. Reflecting mirror 4 that reflects an image and irradiates the screen 1, glasses 6 worn by an observer 5 when viewing the projected images from the projectors 2 and 3, and video signals to be projected by the projectors 2 and 3 Are respectively provided with video creation means 7 and 8 and synchronization means 9 for establishing synchronization of the video creation means 7 and 8.

  The screen 1 is formed in a spherical shape having a curvature both in the horizontal direction and in the vertical direction, and is disposed with a concave surface facing the viewer 5 side. When viewed from the viewer 5, for example, about 140 degrees in the horizontal direction. An image can be displayed with an effective viewing angle of about 85 degrees or more in the vertical direction. The effective viewing angle is a viewing angle at which a person can recognize an object in detail. The projectors 2 and 3 are arranged outside the effective viewing angle of the viewer 5 and at a video projection position on the screen 1 where the shadow of the viewer 5 is not formed. 4 is totally reflected and irradiated to the screen 1. The screen 1, the projectors 2 and 3, and the reflecting mirror 4 are held by a frame 10 so as to maintain a positional relationship among them.

  As will be described in detail later, the video creation means 7 and 8 have a video image file for the right eye and for the left eye on the outside or inside, respectively, which are sequentially decoded and further displayed on the screen 1 Sometimes, when viewed from the viewer 5, the image is distorted in advance so as to eliminate distortion on an actual scale, and in response to a synchronization signal from the synchronization means 9, the projectors 2 and 3 transmit polarized light (not shown). The light is projected onto the screen 1 with light having polarization planes orthogonal to each other through the filter. Correspondingly, the glasses 6 worn by the observer 5 allow only the lights of the polarization planes corresponding to the right eye and the left eye to pass through among the lights of the polarization planes orthogonal to each other, and are visually recognized by the observer 5. Let

  FIG. 2 is a block diagram showing an electrical configuration of the virtual reality generating apparatus configured as described above. It should be noted that the virtual reality generation apparatus of the present invention generates a virtual reality video from a compressed moving image video file created using general-purpose shooting means such as a video movie. The compressed moving image video file is compressed and recorded on a medium such as a DVD (digital video disc). In FIG. 2, the medium is shown as the left and right DVDs 11 and 21, but may be another medium on which a moving image is compressed and recorded. In addition, moving image images shot by the left and right shooting means arranged in the horizontal direction by an interval corresponding to human binocular parallax are compressed and recorded on individual DVDs 11 and 21 by those shooting means. However, the left and right photographing means may be integrated and recorded on the same medium.

  The recorded videos of the DVDs 11 and 21 compressed by MPEG2 and MPEG4 are taken into the hard disks 12 and 22 by the video creation means 7 and 8, respectively. The recorded video captured in the hard disks 12 and 22 is decompressed (expanded) in the decompression units 13 and 23, and further converted into video signals in the reproduction display units 14 and 24. The decompression units 13 and 23 and the reproduction display units 14 and 24 constitute decoding means. The thus obtained video signal is subjected to distortion correction by the distortion correction units 15 and 25 for distortion caused by the spherical shape of the screen 1 and installation position correction for distortion caused by offset from the central axis of the sphere of the projectors 2 and 3. Is done.

  The video signals output from the distortion correction units 15 and 25 are written into one of the two frame memories 18, 19; 28, and 29 provided via the changeover switches 17 and 27, respectively. , 19; 28 and 29, video signals are read out via the changeover switches 20 and 30 and given to the projectors 2 and 3 for projection. In the video creation means 7 and 8 configured as described above, the video signal created by the CG does not need to be decompressed in the decompression units 13 and 23 and converted into video signals in the reproduction display units 14 and 24. Directly input from the distortion correction units 15 and 25.

  The video creation means 7 and 8 are composed of a personal computer, and the decompression units 13 and 23, reproduction display units 14 and 24, distortion correction units 15 and 25, and synchronization management units 16 and 26 are stored in the personal computer. Consists of software and hardware that executes it. That is, as video signal processing software, the decompression units 13 and 23 have a movie file decompression process, the reproduction display units 14 and 24 have a video display process, and the distortion correction units 15 and 25 have a video display process. It has a video distortion correction process. The synchronization management units 16 and 26 that manage the synchronization of the decompression units 13 and 23, the reproduction display units 14 and 24, and the changeover switches 17 and 27; 20, 30 have a synchronization management process.

  Here, in the present invention, the video creation means 7 and 8 are slaves, and the synchronization means 9 is provided as a master. The synchronization means 9 is also composed of a personal computer, and is connected to the video creation means 7 and 8 by a network 31. Also in the synchronizing means 9, the recorded video from the DVD 11 or 12 (11 in FIG. 2) is taken into the hard disk 32, decompressed by the decompression unit 33, and further converted into a video signal by the reproduction display unit 34. Using the time code in the video signal, the synchronization management unit 36 controls the switching of the changeover switches 17, 27; 20, 30 and the like as will be described later via the synchronization management units 16 and 26. Synchronization between the video signals from the creation means 7 and 8 is established. The decompression unit 33 has a movie file decompression process, the reproduction display unit 34 has a video display process, and the synchronization management unit 36 has a synchronization management process and a time management loop process. An example of the synchronization management process, the movie file decompression process, the video display process, and the video correction process executed by the video creation means 7 and 8 will be described in detail with reference to FIGS. 5 and 8 to be described later. An example of the time management loop process, the synchronization management process, the movie file decompression process, and the video display process executed by the synchronization unit 9 will be described in detail later in the description of FIG.

  FIG. 3 is a diagram for explaining distortion correction processing for the spherical shape of the screen 1 by the distortion correction units 15 and 25. When the video signal video obtained in the reproduction display units 14 and 24 is projected onto the spherical screen 1 as it is, a distorted video is obtained as shown in FIG. For this reason, as shown in FIG. 3B, the image is distorted in advance in the distortion correcting sections 15 and 25 so that the distortion is eliminated when displayed on the spherical screen 1.

  FIG. 4 is a diagram for explaining an installation position correction process for distortion caused by the offset from the central axis of the spheres of the projectors 2 and 3 by the distortion correction units 15 and 25. In FIG. 4, the reflecting mirror 4 is omitted, and it is shown as projecting from the back of the observer 5. In the video signal subjected to distortion correction for the spherical shape, the projectors 2 and 3 are installed on the central axis c passing through the center O of the sphere, as shown in FIGS. 4 (a) and 4 (b). When projected with, the image is undistorted. However, as can be understood from FIG. 1, the projectors 2 and 3 need to be installed at positions where they do not become shadows of the observer 5. In particular, as the diameter of the screen 1 decreases, the offset from the central axis increases. growing. Therefore, as shown in FIG. 4C, in a state where the projectors 2 and 3 are not on the central axis c, the distortion correction units 15 and 25 further distort the image according to the installation positions of the projectors 2 and 3. Correct by giving.

  In addition, some projectors have a function that can change the angle at which an image is projected called an optical axis shift. Therefore, when this function is used, the projectors 2 and 3 are placed on the floor as shown in FIG. 1 and FIG. Can be installed horizontally. In this case as well, it is necessary to distort the image using the optical axis shift as a parameter, and the image display parameter is changed by converting the image display parameter into an asymmetric value in the vertical and horizontal directions along the image display area. However, since the shift of the optical axis requires such a shift mechanism in the projectors 2 and 3, which increases the cost, it is preferable to match the axis of the projectors 2 and 3 with the optical axis.

FIG. 5 is a diagram for explaining a distortion correction method by such distortion correction units 15 and 25. Also in FIG. 5, the reflecting mirror 4 is omitted. First, in the correction, as shown in FIG. 5, a view frustum is defined from the viewpoint position of the observer 5 and a video projection frustum from the projection positions of the projectors 2 and 3. The view frustum is represented by a quadrangular pyramid with the vertex as the viewpoint position P ₀ and the bottom face P _0,0 , P _{m, 0} , P _{m, n} , P _{0, n,} and the projection frustum is the projector back focus The vertex as a position is expressed as Q ₀ , and the bottom is expressed as Q _0,0 , Q _{m, 0} , Q _{m, n} , Q _{0, n} . Here, m and n represent video resolutions. When the video signal is, for example, SXGA, m = 1279 and n = 11023. The bottom surface is also called a virtual screen surface.

Here, for simple expression, an image viewed from a yz two-dimensional section at m = i is shown in FIG. First, a point P _{i, j} is assumed in the virtual screen surface 1a, and an intersection point R _{i, j} between the vector P ₀ P _{i, j} and the dome screen 1 is obtained. Next, an intersection point Q _{i, j} between the vector Q ₀ R _{i, j} and the virtual screen surface 1b of the projection frustum is obtained. If i and j are changed as 0 ≦ i ≦ m and 0 ≦ j ≦ n, a P _{i, j} → Q _{i, j} correspondence map can be created, and this correspondence map is the reverse of image distortion. It becomes correction. That is, first, normal video generation is performed based on the view frustum, then this video data is taken out, and the image is again applied by applying texture mapping coordinates using the P _{i, j} → Q _{i, j} correspondence map to this image. By performing the generation, video distortion correction is realized. An image obtained by applying the P _{i, j} → Q _{i, j} correspondence map to the grid video is shown in FIG. 7 (that is, the reverse of FIG. 3B). This distortion correction method does not limit the shape of the screen 1. That is, not only a dome screen but also a multi-screen combining planes and an elliptical sphere whose curvature changes continuously can be applied as long as the screen surface can be measured or analytically specified.

  In this way, when the distortion correction function is realized by software, when it is realized by optical processing using a fisheye lens etc., a lens suitable for the display system is created in advance, and an image is created and displayed using that lens. However, when the size and shape of the display system are changed, it is not possible to cope with it. However, realization with software is advantageous because it can be handled only by setting parameters according to the display system.

  FIG. 8 is a flowchart for explaining the operation of establishing synchronization between the left and right video signals in the virtual reality generating apparatus configured as described above. The main software that realizes the virtual reality generation apparatus includes the time management loop process, the synchronization management process, the movie file decompression process, the video display process, and the video distortion correction process as described above. The synchronization management process, movie file decompression process, and video display process operate in the video creation means 7 and 8 in cooperation with each other through a series of processes. These video creation means 7 and 8 which are slave personal computers are not limited to two but can be further expanded to support multi-screens. The time management loop process is the only process and may be executed at one location of a plurality of personal computers. In the present embodiment, as described above, on the synchronization means 9 which is an independent master personal computer. Run with. Each process communicates using the network 31. In FIG. 8, the operation | movement by the said synchronous management process is shown with a broken line.

  The master personal computer executes the time management loop process and the synchronization management process. Thus, first, the current time is acquired by the time management loop process, and when the specified time has elapsed, the current time is distributed from the synchronization management process to the slave personal computer (S101, S102). That is, the synchronization management process performs swap synchronization, which is a switching command for the changeover switches 17, 27; 20, 30 for switching between the time and two frame memories 18, 19; A message will be sent.

  On the other hand, the slave personal computer executes the movie file decompression process, the video display process, and the video distortion correction process. As a result, first, the video display process receives the current time, and sends back to the master personal computer as a receipt that it has been received (S201, S202). Further, the video display process updates the reference time, further distributes the reference time to the movie file decompression process (S203), and waits for a frame data update notification (S204).

  In response to this, the movie file decompression process obtains a reference time (S301) and compares it with the time at which the currently obtained frame is to be displayed (S302). As a result of the comparison, if the delay is within 2 frames, the frame data is updated, that is, decompressed, and the address in the frame buffer is notified to the video display process (S303). Further, the movie file decompression process notifies the video display process that the frame data has been updated (S304).

  Upon receiving the frame data update notification (S204, S205), the video display process acquires frame data as video from the address in the frame buffer already notified in S303 (S206), and completes the frame data update process to the movie file decompression process. (S207), and the video is drawn in the back buffer (the one of the two frame memories 18, 19; 28, 29 that is not selected on the output side (frame memories 18, 28 in FIG. 2)), that is, The video signal is reproduced (S208).

  On the other hand, in the master personal computer, when the receipt is received in S103, the synchronization management process transmits a swap synchronization message to the video display process of the slave personal computer (S104). In response to this, the video display process calls the video distortion correction process to execute the process (S209), and then executes buffer swap, and receives a receipt indicating that it has been received by the synchronization management process of the master personal computer. Reply (S210, S211, S212). Thereafter, the video display process waits for reception of the current time in S201. As shown in FIG. 5, the video distortion correction can be realized with a delay of a predetermined time by rereading the correspondence map, whereby left and right projectors 2 and 3 project video images that are synchronized with each other. Will be.

  In the movie file decompression process, when a frame data update completion notification is received (S305), one new frame is acquired from the compressed movie file (S306). Further, even if the delay exceeds 2 frames as a result of the comparison in S302, one frame is newly acquired in S306.

  In the synchronization management process of the master personal computer, the process is stopped until receipt of the swap synchronization message is received from the video display process, and when the receipt is received, the process starts with acquisition of the current time (S105).

  By configuring in this way, multiple interactive movie files can be transferred to multiple computers while performing real-time processing of decompression, playback, and distortion correction of movie files such as live-action video without using special hardware. It is possible to play back synchronously. In particular, the movie file formats such as MPEG2 and MPEG4 do not have the concept of each frame, and the file capacity is compressed by managing only the difference between the video signals, so the process of reconstructing the frame from the difference information In the present invention, real-time processing (30 frames / second) can be realized by simultaneously executing processing such as reproduction, synchronization, and distortion correction while executing this heavy processing process.

It is a figure which shows the whole structure of the virtual reality generation apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the electrical structure of the virtual reality production | generation apparatus shown in FIG. It is a figure for demonstrating the distortion correction process with respect to the spherical shape of the screen by a distortion correction part. It is a figure for demonstrating the installation position correction process with respect to the distortion produced by the offset from the center axis | shaft of the sphere of the projector by a distortion correction part. It is a figure for demonstrating the method of the distortion correction by a distortion correction part. FIG. 6 is a two-dimensional cross-sectional view of FIG. 5 taken at the center of a hemispherical screen. It is an image figure of distortion correction of a grid picture. It is a flowchart for demonstrating the synchronization establishment operation | movement which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen 2, 3 Projector 4 Reflecting mirror 5 Observer 6 Glasses 7 and 8 Image | video preparation means 9 Synchronization means 10 Frame body 11 and 12 DVD
12, 22, 32 Hard disk 13, 23, 33 Decompression unit 14, 24, 34 Reproduction display unit 15, 25 Distortion correction unit 16, 26, 36 Synchronization management unit 17, 27; 20, 30 Changeover switch 18, 19; 29 Frame memory 31 Network

Claims (2)

A spherical screen with a concave surface facing the observer and a wide viewing angle screen capable of displaying an image larger than the effective viewing angle of the observer, and a plurality of moving image signals viewed from different angles, respectively . A video creation means, a projection means for projecting a video image based on each signal onto a screen and synthesizing and recognizing it by an observer; and a synchronization for executing a time management loop process and a synchronization management process. Having a management unit, and controlling each video creation means, and synchronization means for establishing synchronization between each signal ,
Each of the video creation means includes a synchronization management unit that executes a synchronization management process, a decompression unit that executes a movie file decompression process, a playback display unit that executes a video display process, and a distortion correction unit that executes a video distortion correction process. The decoded moving image video file at each angle is sequentially decoded and converted into the moving image signal, and the decoding device gives the projecting device, the output to the projecting device, and the writing of the decoded video signal And two frame memories that can be used by sequentially switching to
The synchronization means acquires the current time in the time management loop process, and when the specified time has elapsed, distributes the current time from the synchronization management process of the synchronization means toward the decoding means ,
The video display process receives the current time, returns a receipt representing the reception to the synchronization means and updates the reference time, and distributes the reference time to the movie file decompression process ,
The movie file decompression process acquires the reference time and compares it with the time at which the currently acquired frame is to be displayed. As a result, if the delay is within 2 frames, the frame data is updated, Notifying the video display process of the address and notifying the video display process that the frame data has been updated ,
Upon receiving the frame data update notification, the video display process acquires frame data from the address in the already notified frame buffer as video, notifies the movie file decompression process of completion of frame data update, and sends the video to the video Of the two frame memories provided in the creation means, draw on the one not selected on the output side and call the video distortion correction process to execute the process ,
Upon receiving the frame data update completion notification, the movie file decompression process acquires new frame data ,
In the synchronization management process of the synchronization means, upon receipt of the receipt, a swap synchronization message is transmitted to the video display process ,
The virtual reality generation apparatus characterized in that the video display process executes swap of the two frame memories, returns a receipt to the synchronization management process of the synchronization means, and waits for reception of the current time again . A plurality of video images viewed from different angles are projected onto the viewer by projecting them on a wide viewing angle screen that is spherical with the concave surface facing the viewer and capable of displaying images that are larger than the viewer's effective viewing angle. In a virtual reality generation method for displaying a stereoscopic video image by combining and recognizing it,
The compressed video image file at each angle is sequentially decoded by a decoding unit including a synchronization management process, a movie file decompression process, a video display process, and a video distortion correction process provided in each video creation unit, and the video image In establishing the synchronization between the respective signals by controlling the video creation means in the synchronization means executed including the time management loop process and the synchronization management process.
When the current time is acquired by the time management loop process and the specified time has elapsed, the current time is distributed from the synchronization management process of the synchronization means toward each decoding means,
The video display process receives the current time, returns a receipt indicating the reception to the synchronization means and updates the reference time, and distributes the reference time to the movie file decompression process,
The movie file decompression process acquires the reference time and compares it with the time at which the currently acquired frame is to be displayed. As a result, if the delay is within 2 frames, the frame data is updated, Notify the video display process of the address, notify the video display process that the frame data has been updated,
When receiving the frame data update notification, the video display process obtains the frame data as video from the address in the already notified frame buffer, notifies the movie file decompression process of completion of the frame data update, and creates the video as video creation means Draw in the one that is not selected on the output side of the two frame memories provided in the inside and call the video distortion correction process to execute the process,
Upon receiving the frame data update completion notification, the movie file decompression process acquires new frame data,
In the synchronization management process of the synchronization means, upon receipt of the receipt, a swap synchronization message is transmitted to the video display process,
A virtual reality generation method characterized in that the video display process executes swap of the two frame memories, returns a receipt to the synchronization management process of the synchronization means, and waits for reception of the current time again.

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