TWI446005B - Device for projecting stereo image and method for projecting stereo image - Google Patents

Description

Stereoscopic image projection device and stereoscopic image projection method

The present invention relates to a projection apparatus for a stereoscopic image and a projection method of a stereoscopic image, and more particularly to a projection apparatus and a projection method of a stereoscopic image which can connect a stereoscopic image projected by 360° in a horizontal direction.

In the past, various projection methods have been proposed which can stereoscopically view a stereoscopic image of an image. In particular, recently, since the development of technologies for various machines has been promoted, not only stereoscopic films of so-called stereoscopic glasses using blue filters and red filters known from the past, but also three-dimensional liquid crystal display devices or liquid crystal shutter glasses are proposed. The projection method of the stereoscopic image, and the projection of the stereoscopic image by the hologram has also become a practical level technology. Further, recently, stereoscopic glasses for setting two types of polarizing filters having different polarizing conditions for the blue filter and the red filter have been used.

However, in the case of such a three-dimensional image projection method, in the case of constructing a system which is relatively inexpensive and can be viewed by a plurality of people at the same time, the projection method using stereoscopic glasses is advantageous in terms of price, and is used in a sky-like instrument.

Further, a simulated boarding device (for example, refer to Patent Document 1) is proposed, and instead of displaying a stereoscopic image, a plurality of projectors are projected onto a screen having a concave spherical shape to display a stereoscopic image with high definition. .

Patent Document 1: JP-A-2000-132082

However, in the stereoscopic image obtained by these projection methods, although a stereoscopic image is seen, since the edge of the screen or the display can be seen, the stereoscopic image itself becomes small, so there is a lack of commitment to the virtual space by the stereoscopic image. .

Therefore, it is impossible to have the feeling that it exists in the imaginary space expressed by the stereoscopic image, and the result is the same as the state of the general two-dimensional image such as a movie.

In view of such a situation, the present inventors have made it possible to introduce a stereoscopic image with high input feeling, and it is easy to attract a viewer into an imaginary space, and to experience a different image from the past, and to carry out research and development. The present invention has been completed.

In the projection apparatus for a stereoscopic image of the present invention, the stereoscopic image that can be stereoscopically viewed through the stereoscopic glasses provided with the first polarizing filter and the second polarizing filter is projected onto the screen by the image projection device. The screen system has a inner peripheral surface as a screen surface and is provided in a cylindrical shape; the image projection device is provided with a plurality of stages in a manner opposite to the screen surface, and the stereoscopic image of the screen surface is 30 degrees or less in the circumferential direction of the screen surface, Projected from the image projection device to be arranged along the circumferential direction of the screen surface to produce a series of stereoscopic images in the circumferential direction.

Further, the projection apparatus for a stereoscopic image of the present invention is also characterized in the following points. In other words, (1) the stereoscopic image projected by each of the image projecting devices is based on a plurality of stereoscopic images having a number of 30 degrees or less in the circumferential direction of the screen surface. A stereoscopic image projected by connecting the image data formed by the divided image data.

(2) The connection image data is generated by setting the overlapping amount portion to the adjacent divided image data at the time of projection, and combining the overlapping amount portion to become a predetermined brightness.

(3) The image projection device uses the side portion on the circumferential side of the stereoscopic image projected on the screen surface as a superimposed image, and projects the overlap image of the stereoscopic image projected adjacent to the circumferential direction to overlap each other.

(4) The image projecting device has an adjustment mode for projecting a positional alignment image having a lattice pattern of a predetermined pitch on the screen surface in order to perform alignment with the adjacently projected stereoscopic image; Aligning the overlapping image portion of the side portion on the circumferential side of the image, a missing region in which at least a portion of the lattice pattern is missing is provided, and the missing region is disposed at a position where the overlapping image portion overlaps with the lattice pattern, the overlap The quantity image portion is provided with a missing area of the position alignment image projected adjacently.

(5) An image projection device that projects one of the image for the left eye and the image for the right eye, and projects the image of the other image by projecting the lattice pattern of the alignment image in the first color. The projection device projects a grid-like pattern of the alignment image in a second color, and projects it to overlap the grid pattern of the first color, and projects the grid pattern of the second color on the grid of the first color. The missing area of the first position alignment image projected by the pattern is projected on the missing area of the second position alignment image projected by the grid pattern of the second color, and the grid pattern of the first color is projected. And the missing region projected by the lattice pattern of the first color of the image for the adjacent projection and the missing region projected by the lattice pattern of the second color are superimposed, and the position of the adjacent projection image is aligned. The missing area projected by the lattice pattern of the second color overlaps with the missing area projected by the lattice pattern of the first color.

(6) A blue filter is used instead of the first polarizing filter, and a red filter is used instead of the second polarizing filter.

Further, in the projection method of the stereoscopic image of the present invention, the stereoscopic glasses provided with the first polarizing filter and the second polarizing filter can be seen to be superimposed and projected on the screen by the image projecting device. a stereoscopic image composed of an image for the left eye and an image for the right eye. In the projection method, the screen is formed into a cylindrical body having an inner peripheral surface as a screen surface; and the plurality of image projection devices are disposed so as to be opposed to the screen surface. In addition, a stereoscopic image having a volume of 30 or less in the circumferential direction of the screen surface is projected from the image projecting device to be arranged along the circumferential direction of the screen surface, thereby generating a series of stereoscopic images in the circumferential direction.

According to the present invention, in a projection method and a projection apparatus for a stereoscopic image, stereoscopic glasses provided with a first polarizing filter and a second polarizing filter can be seen to be projected by an image projection apparatus in an overlapping manner. a three-dimensional image composed of an image for the left eye and a image for the right eye on the screen, the screen is formed into a cylindrical body having a screen surface on the inner circumference; and the plurality of image projection devices are arranged to face each other with the screen surface, And projecting a stereoscopic image of 30 degrees or less in the circumferential direction of the screen surface from the image projection device into Arranged along the circumferential direction of the screen surface, thereby connecting the horizontal direction to 360°, and the portion of the joint of the adjacent images has no uncomfortable stereoscopic image projection.

Therefore, since the viewer of the stereoscopic image can view the stereoscopic image without realizing the screen, it is possible to improve the investment in the virtual space by the stereoscopic image, and to obtain a more realistic virtual experience.

Moreover, although the screen surface has a predetermined size in the up-and-down direction, it appears to be located closer to the viewer side than the screen surface by the stereoscopic image projected on the screen surface, and expands the visual and vertical field of view. I didn't realize the existence of the screen, and did not set the screen above the viewers, creating an imaginary space with a high sense of input.

In the projection method of the stereoscopic image and the projection apparatus of the stereoscopic image of the present invention, it is possible to see that the image projection device is superimposed and projected on the screen via the stereoscopic glasses provided with the first polarizing filter and the second polarizing filter. a stereoscopic image composed of an image for the left eye and an image for the right eye, in particular, the screen uses a cylindrical body having an inner peripheral surface as a screen surface, and a plurality of image projection devices are disposed to face each other with respect to the screen surface, and The stereoscopic images projected by the respective projections are arranged along the circumferential direction of the screen surface, and the stereoscopic images are continuously projected in the circumferential direction.

That is, as shown in FIGS. 1 to 3, the projection apparatus for a stereoscopic image according to the embodiment of the present invention is constituted by the following members, and the screen 10 of the cylindrical body has the inner peripheral surface as the screen surface S; The image projection device set 20 of the stage is disposed to face the screen surface S.

Here, the image projecting device group 20 is composed of two of the first image projecting device 20a that projects the image for the left eye of each camera and the second image projecting device 20b that projects the image for the right eye. The pair of image projection devices superimposes the same image on the screen surface S by the image for the left eye projected by the first image projecting device 20a and the image for the right eye projected by the second image projecting device 20b. The area produces a stereo image.

Each of the first image projecting device 20a and the second image projecting device 20b is a projection device that uses a liquid crystal display device such as a transmissive, semi-transmissive or reflective type, which is generally referred to as a "projector", and is mounted to apply a corresponding three-dimensional image. The polarizing filter of the first polarizing filter of the visual glasses and the polarizing treatment of the second polarizing filter passes through the polarizing filter, and each of the images is projected to generate an image for the left eye and a right eye. image.

In the present embodiment, one stereoscopic image is generated by using two image projection devices of the first image projecting device 20a and the second image projecting device 20b. However, if possible, for example, instead of the image projecting device group 20, stereoscopic images may be used. The image-specific image projection device has two light sources and two liquid crystal display devices built therein, and generates images for the left eye and images for the right eye, and images of the left eye and the image for the right eye are generated. Overlap and synthesize post-projection.

Further, in the present embodiment, the first video projecting device 20a and the second video projecting device 20b are arranged to be vertically stacked, but they may be arranged to be arranged to the left and right. In particular, when arranged in the right and left direction, the heat generated by each of them does not affect the other side, and abnormal heat generation of the first image projecting device 20a and the second image projecting device 20b can be easily prevented.

In the present embodiment, six sets of image projecting device groups 20 are provided, and each of the image projecting device groups 20 is formed to project a stereoscopic image in a region of 60° which is a screen of 360° in the circumferential direction.

The image data of the stereoscopic image projected from each image projection device group 20 is memorized and managed by a management device (not shown), and the management device outputs the desired image data as a video signal, and transmits the image signal to the desired signal. The cable is input to the first image projecting device 20a and the second image projecting device 20b of each image projecting device group 20 so that projection is possible.

The management device is a computer such as a personal computer. In the present embodiment, it is composed of three personal computers that can operate in synchronization with each other. For each computer, four video signal output terminals are respectively provided, and three video signal output terminals are provided in three sets, so that 12 image projecting devices 20a and 20b composed of six groups of image projecting device groups 20 can output desired signals. Image signal. By simultaneously operating the three personal computers, the video signals outputted from the respective video signal output terminals are synchronized to prevent variations between the video projecting devices 20a and 20b.

In each computer, each of the image data converted into an image signal and outputted is memorized in a memory device such as a hard disk, and each computer converts the desired image data into image signals in sequence and outputs them from the image signal output terminals.

In particular, in the present embodiment, when the memory means stores the image data, the synthesized image data synthesized by the image data of the four image projecting devices 20a and 20b is memorized, and when converted into the image signal, the synthesized image data is used. After being divided into image data, the image is converted into image signals. And output from each image signal output terminal.

As shown in Fig. 1, each of the image projecting device groups 20 is disposed on the upper surface of the screen surface S facing the screen surface S on which the stereoscopic image is projected. In this manner, the image projecting device group 20 is disposed on the upper portion of the screen surface S, and the image projecting device group 20 does not become an obstacle, and the heat generated by the image projecting device group 20 can be quickly discharged upward. It is possible to suppress the temperature rise in the space inside the screen 10. In addition, the screen 10 is provided with an appropriate skeleton so that each image projection device group 20 can be stably supported. Further, the image projecting device group 20 is not limited to being disposed on the upper portion of the screen surface S, and may be disposed on the floor as far as practicable.

A seat 30 for the viewer is provided inside the cylindrical screen 10. Further, a part of the screen 10 is provided at an entrance (not shown) for access to the inside of the screen, and an inner peripheral surface of the door (not shown) that closes the entrance is also used as a screen.

In the present embodiment, in the seat portion 30, the two-stage circular step 31 is provided concentrically with the cylindrical screen 10, and the seat 30 is provided in a circular arc shape in each of the stages. The seat 30 of the present embodiment is constituted by a frame in which an elastic member is disposed. In Figs. 1 to 3, reference numeral 32 denotes an armrest 3, and reference numeral 33 denotes a ramp.

Since the image projected by the projection apparatus of the stereoscopic image thus constituted has a peripheral surface shape, the continuity of the joint portion of the adjacent three-dimensional image is not sufficiently maintained in the general projection method.

That is, when six sets of image projection device groups 20 project three-dimensional images of 60 degrees in the circumferential direction and connect the three-dimensional images in the circumferential direction, only When the image projecting device group 20 simply projects a general image, it is similar to the six planar screens in which the images are projected in the circumferential direction, and since the connection of the adjacent stereoscopic images cannot be smoothly continued, Part of the stereo image is deviated or deformed at the joint, and the stereoscopic effect itself is reduced.

Therefore, the projection angle in the circumferential direction of one image projecting device 20 is made smaller, for example, by projecting an image at 30° or less in the circumferential direction, it is confirmed that there is no uncomfortable feeling at the joint portion of the adjacent image. Stereoscopic image.

At this time, since one image projecting device 20 projects a 30-degree image in the circumferential direction, in order to display a series of stereoscopic images of 360°, 12 sets of 24 image projecting devices 20a and 20b are required. Therefore, the projection device of the stereoscopic image becomes expensive, and the load of the image projected by each of the image projecting device groups 20 is input to the load of the management device of the first image projecting device 20a and the second image projecting device 20b of each image projecting device group 20. Increase.

Therefore, for example, it is determined that one image of each of the 60-degree stereoscopic images is projected in the circumferential direction by combining the two adjacent images in the case where the three-dimensional images of each 30° are projected in the circumferential direction. The image projection projected by the projection device group 20. In the present embodiment, images projected by one image projecting device group 20 are generated by three stereoscopic images of 20 degrees in the circumferential direction.

Here, the image data projected by one image projection device group 20 is referred to as "connected image data", and the image data used to generate the linked image data is referred to as "divided image data". In addition, in the present invention, image projection is mounted The liquid crystal display device provided in each of the first image projecting device 20a and the second image projecting device 20b of the set 20 is referred to as "image", and the display on the screen surface S is referred to as "image".

When each divided image data is created, as shown in FIG. 4, rectangular projection areas s1, s2, and s3 are assumed at positions of the screen surface S on which the image generated based on the divided image data is projected, and the image projecting device 20 is considered. The positional relationship with the projection point P, that is, the inclination of each of the projection regions s1, s2, and s3 in the projection direction is created.

Further, in the case where the distance from the image projecting device 20 to the screen surface S is sufficiently large, the difference in the inclination of each of the projection regions s1, s2, and s3 in the projection direction is small, as shown in FIG. In the same manner, the projection areas s1, s2, and s3 perpendicular to the projection direction are assumed, and each divided image data is created.

Further, when each divided image data is created, instead of creating the image data of each projection area size, the overlapping amount of the image generated by the image and the adjacent divided image data is set, and the projection ratio is created. The image size of the area is only larger than that of the area of the overlap amount.

The image data of the overlap amount portion is made to appropriately adjust the brightness, and the state in which the overlap amounts overlap each other becomes a predetermined brightness.

In the present embodiment, three divided video data arranged in the circumferential direction are combined to form a video data, and the video data is connected as a video signal, and the first video projection device 20a or the first image projection device 20 of the video projection device group 20 is connected from the management device. The image projection device 20b inputs and displays the image on the screen surface S as a stereoscopic image.

At this time, the overlap amount image composed of the overlap amount is displayed on the side portion on the circumferential side of the stereoscopic image displayed on the screen surface S, and the overlap amount of the stereoscopic image projected adjacent to the circumferential direction is displayed. The images are projected in an overlapping manner, and the adjacent stereoscopic images can be turned into a series of stereoscopic images without any sense of discomfort.

As described above, in the present embodiment, the divided image data is generated in an amount of 20 degrees in the circumferential direction of the screen surface S. However, in the case where one image projection device group 20 projects a stereoscopic image of 60 degrees in the circumferential direction, The divided image data may also be made into a 1° portion, a 2° portion, a 3° portion, a 4° portion, a 5° portion, a 6° portion, a 10° portion, a 12° portion, a 15° portion, or the circumferential direction of the screen surface S. The 30° portion is combined with the necessary number of divided image data to form a linked image data.

Moreover, the overlap image is preferably about 10% of the circumferential direction of the stereoscopic image projected by the image projection device group 20 on the screen surface S. When the image data is connected, the image data which is part of the overlap image can be appropriately adjusted. .

As described above, in the projection apparatus for a stereoscopic image of the present embodiment, a plurality of image projection apparatuses 20a and 20b are provided opposite to the screen surface S, and the screen surface of the screen surface S is 30 degrees or less from the image projection apparatuses 20a and 20b. The stereoscopic images are projected to be arranged along the circumferential direction of the screen surface S to produce a stereoscopic image connected in the circumferential direction, so that a stereoscopic image with no uncomfortable feeling at the joint portion of the adjacent images can be obtained.

Further, the stereoscopic image projected from each of the image projecting devices 20a and 20b is formed by combining the divided image data of a plurality of stereoscopic images having a volume of 30 or less in the circumferential direction of the screen surface S. Since the stereoscopic image is projected, the projection device for suppressing the stereoscopic image becomes expensive, and the load of the management device is reduced.

Moreover, since the connected image data is obtained by setting the overlapping amount portion to the adjacent divided image data at the time of projection, and combining the overlapping amount portion to the image data of the predetermined brightness, the adjacent stereoscopic image can be obtained. It becomes a series of stereoscopic images without any sense of coordination.

Further, in the projection apparatus for a stereoscopic image according to the present embodiment, the stereoscopic image projected from the adjacent image projection device group 20 is partially overlapped with the overlapping image, and is projected by one of the image projection device groups 20. The overlapping image of the stereoscopic image is deviated from the projection position of the overlapping image of the stereoscopic image projected by the other image projection device group 20, and an appropriate stereoscopic image may not be projected.

Therefore, the management device is provided with an adjustment mode for projecting the positional alignment image of the image of the grid pattern of a predetermined pitch from the image projection device group 20 onto the screen surface S.

In particular, in the adjustment mode in which the position is projected for image projection, the first image projecting device 20a of the image projecting device group 20 projects the grid pattern in the first color, and the second image projecting device 20b displays the grid pattern in the first image. The two-color projection is projected so as to overlap the lattice pattern of the first color and the lattice pattern of the second color, and is adjusted so that the projection positions of the first image projecting device 20a and the second image projecting device 20b overlap each other.

Here, the colors different in the first color and the second color are preferable. In the present embodiment, for example, the first color is blue, and the second color is red, and the lattice pattern of the first color is formed. 2-color grid pattern turns white when overlapping Grid pattern.

In order to align the adjacent three-dimensional images, as shown in FIG. 6(a), the first missing area is set in the positional alignment image of the first image projecting device 20a projected in the lattice pattern of the first color. 41. The overlap amount image 40 of the side portion provided on the circumferential direction side lacks a lattice pattern. In the present embodiment, the first missing area 41 is formed in a rectangular shape in a region of about half of the center of the positional image for the overlap amount image 40.

Further, as shown in FIG. 6(b), the second missing region 42 is also provided in the positional alignment image of the second image projecting device 20b projected in the lattice pattern of the second color, and is disposed in the circumferential direction. The amount of overlap of the side portions of the side portion of the image 40 is lacking in a lattice pattern. In the present embodiment, the second missing area 42 is formed in a rectangular shape in a region of about half of the side in the circumferential direction of the image for alignment of the overlap amount image 40.

In this manner, by providing the first missing area 41 and the second missing area 42 and the first image projecting devices 20a of the adjacent image projecting device groups 20, the lattice patterns of the other overlapping amount images 40 can be placed on each other. The first missing regions 41 are overlapped, and the alignment of the adjacent three-dimensional images is performed by overlapping the lattice patterns in the missing regions.

In particular, in the present embodiment, by superimposing the positional alignment image of the first image projecting device 20a and the positional alignment image of the second image projecting device 20b, as shown in Fig. 6(c), alignment is generated. An image in which a red grid pattern is projected onto the first missing area 41 of the overlap amount image 40 portion, and a blue grid pattern is projected on the overlap amount image 40 portion The second missing area 42.

By projecting the positional alignment image in which the blue grid pattern and the red grid pattern are arranged from the image projection device group 20 to the overlap amount image 40, the other position alignment image can be reddish. The grid pattern overlaps the blue grid pattern of the adjacent one of the alignment images, and the blue grid pattern of the other alignment image can be superimposed on the adjacent one. The red grid pattern of the image.

Therefore, in the case where the positional alignment image is not displaced by the adjacent image projection device group 20, the white grid pattern can be uniformly projected, and the correct position adjustment can be confirmed.

On the other hand, when the positional deviation of the alignment image is projected at the position projected by each of the adjacent image projection device groups 20, it is extremely easy to visually recognize that the white lattice pattern is not projected in the positional deviation portion. Position deviation part, and can be adjusted with high precision.

Therefore, images moving between adjacent stereoscopic images can be projected without uncomfortable feeling.

As described above, in the present embodiment, the case where the first polarizing filter and the second polarizing filter are used for the stereoscopic glasses will be described, but the blue polarizing filter may be used instead of the first polarizing filter. Instead of the second polarizing filter, the stereoscopic image is projected using stereoscopic glasses using a red filter. However, in stereoscopic glasses using the first polarizing filter and the second polarizing filter, stereoscopic images of color images can be visually recognized, but stereoscopic glasses using blue filters and red filters are only used. Can listen A stereoscopic image of a monochrome image.

S‧‧‧ silver screen

10‧‧‧ screen

20‧‧‧Image Projector Set

20a‧‧‧1st image projection device

20b‧‧‧2nd image projection device

30‧‧‧ seats

31‧‧‧ steps

32‧‧‧Handrails

Fig. 1 is a schematic perspective view of a projection apparatus for a stereoscopic image according to an embodiment of the present invention.

Fig. 2 is a schematic plan view of a projection apparatus for a stereoscopic image according to an embodiment of the present invention.

Fig. 3 is a schematic longitudinal cross-sectional view showing a projection apparatus for a stereoscopic image according to an embodiment of the present invention.

Fig. 4 is an explanatory diagram of a method of producing divided image data.

Fig. 5 is an explanatory diagram of a method of producing divided image data.

Fig. 6 is an explanatory diagram of a positional alignment image projected on the screen surface in the adjustment mode.

10‧‧‧ screen

20‧‧‧Image Projector Set

20a‧‧‧1st image projection device

20b‧‧‧2nd image projection device

30‧‧‧ seats

31‧‧‧ steps

32‧‧‧Handrails

S‧‧‧ silver screen

Claims (5)

A projection device for a stereoscopic image, comprising: a screen formed into a cylindrical shape and having an inner peripheral surface as a screen surface; and a plurality of image projection devices disposed above the screen in a circumferentially spaced manner, the plural The image projection device projects a stereoscopic image, which can be stereoscopically viewed by stereoscopic glasses equipped with a first polarizing filter and a second polarizing filter, and includes a plurality of adjacent and combined images and Each of the images includes a plurality of adjacent and combined divided images respectively projected by the plurality of image projection devices onto the screen surface of the screen, so that the image projection device and the screen face are opposite to each other. Forming a stereoscopic image adjacent to each other in a circumferential direction of the screen surface; a first overlapping portion is formed on a side portion of each of the combined images of the respective stereoscopic images, and the respective combined image systems are combined with each other to make the combination The overlapping portions of the image overlap each other; and a second overlapping portion is formed at a side portion of each of the divided images, the divided images being combined with each other to make the Cut image of an overlapping portion overlapped each other. The projection apparatus of the stereoscopic image of claim 1, wherein each of the image projection apparatuses has an adjustment mode, which is set to a lattice pattern of a predetermined pitch in order to perform alignment of the stereoscopic images projected adjacently. The position alignment image is projected on the screen surface; the side portion on the circumferential side of the alignment image is disposed at the position a portion of the overlapping image portion is provided with a missing region in which at least a portion of the lattice pattern is lacking, and the missing region is disposed at a position where the lattice pattern of the overlapping image portion overlaps, and the overlapping image portion has a phase The position of the adjacent projection is aligned with the missing area of the image. The projection apparatus of the stereoscopic image of claim 2, wherein the image projection apparatus for projecting one of the image for the left eye and the image for the right eye is to align the grid pattern of the image for the position a first color projection; an image projection device that projects the other image, and the grid pattern of the alignment image is projected in a second color and projected to overlap the lattice pattern of the first color; The grid pattern of the second color is projected on the missing area of the first position alignment image projected by the grid pattern of the first color; and the grid pattern of the first color is projected on the grid pattern of the second color a missing area of the second position alignment image projected by the pattern; a missing area projected by the lattice pattern of the first color of the positional alignment image projected adjacently and a missing pattern projected by the lattice pattern of the second color The area overlaps; the missing area projected by the lattice pattern of the second color of the positional image for adjacent projection is overlapped with the missing area projected by the lattice pattern of the first color. A projection apparatus for a stereoscopic image according to claim 1, wherein a blue filter is used instead of the first polarizing filter, and a red filter is used. The second polarizing filter is replaced by a second polarizing filter. A method for projecting a stereoscopic image, comprising: providing a screen formed in a cylindrical shape and having an inner peripheral surface as a screen surface; and providing a plurality of image projection devices disposed on the screen in a circumferentially spaced manner Projecting a stereoscopic image, which can be stereoscopically viewed by stereoscopic glasses equipped with a first polarizing filter and a second polarizing filter, including a plurality of adjacent and combined images and thus defined Each of the images includes a plurality of adjacent and combined divided images respectively projected by the plurality of image projection devices onto the screen surface of the screen, so that the image projection device and the screen face are opposite to each other to form a stereoscopic image adjacent to each other in a circumferential direction on the screen surface; forming a first overlapping portion on a side portion of each combined image, and combining the combined images with each other such that overlapping portions of the combined image overlap each other; and forming a second overlapping portion The divided images are combined with each other at the side portions of each of the divided images such that overlapping portions of the divided images overlap each other.