JPH10206984A - Video presenting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video presenting device capable of utilizing the function of an eye to be the basis of perceiving depth on the same condition as natural vision and obtaining a video with substantiality. SOLUTION: This device is provided with a source image projection means 10 projecting plural divided images and forming real images corresponding to the respective divided images at positions different from each other in the direction of an optical path A in such positional relation that the images are superimposed on each other in the case of viewing from the direction of the optical path A, and a cylindrical concave mirror 30 reflecting and guiding the image light of the divided images to an observer 2. A cylindrical lens 20 is arranged between the projection means 10 and the mirror 30. The divided images express the presented objects as if existing in plural areas formed by sectioning space where the presented object exists in a depth direction. The projected divided images are enlarged in a horizontal direction by the lens 20 and enlarged in a vertical direction by the mirror 30, and perceived by the observer 2 as an enlarged virtual image Q at the back of the mirror 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image presenting apparatus for allowing an observer to perceive an image having a sense of depth.

[0002]

2. Description of the Related Art As a method of presenting an image with a sense of depth to a human, a "binocular parallax method" in which two types of images for the left and right eyes are prepared in the same manner as when a human sees with both eyes, "Pseudo-volume method" 2 that actually presents an image with physical depth
They are broadly classified into types (these terms are not authorized linguistic terms but may be similar but different).

[0003] Among them, the "binocular parallax method" requires special means for independently presenting the prepared images for the left and right eyes to the eyes corresponding to the observer. "HMD (Head)
“Mount Display) type”, (2) “Quadrature modulation / demodulation” in which left / right eye images are modulated with orthogonal phase characteristics such as blue / red hue modulation and vertical / horizontal polarization modulation, and demodulated by colored glasses or polarized glasses. Type) and (3) “separation optical system type” in which left and right eye images are presented to each eye by a lenticular lens or a pupil tracking optical system. These are two images for the left and right eyes taken from different viewpoints having parallax, and images obtained by processing them, and the perception of the sense of depth depends on the recognition process in the brain.

FIG. 16 shows a conventional example of a "quadrature modulation / demodulation type" image presenting apparatus for presenting an image for the right and left eyes which has been subjected to polarization modulation with a phase orthogonal to the rear screen. In the video presenting apparatus of the present example, the left and right eye videos from the video information recording device 111 in which the left and right eye source images having parallax are recorded are independently projected by the projectors 112L and 112R.
Is projected onto the transmission screen 113 from the outside.

The projectors 112L and 112R are equipped with a left-eye image modulation filter 114L and a right-eye image modulation filter 114R, respectively. The left-eye image 115L and the right-eye image 115R on the screen 113 are The light is modulated by polarization (vertical / horizontal or right / left turning) or hue (blue / red) so that the right and left are orthogonal.

An observer 116 facing the screen
Wears glasses having left-eye and right-eye video demodulation filters 117L and 117R that allow only the video on the relevant side to pass, so that the video for the left eye and the video for the right eye reach only the eye on the relevant side. Then, the observer 116 feels the image 118 at the position indicated by the broken line in the figure. The left and right eye images 115L,
If the parallax of 115R is different, the formation position of the sensed image 118 is also different. Since the left and right images for one screen are composed of a large number of regions having different parallaxes, as a result, the observer can obtain perceived images at various different positions at the same time, and produce images with a sense of depth. You will observe.

[0007] The above-mentioned "separation optical system type" using a lenticular lens or a pupil tracking optical system prepares an optical system having an optical path such that the left and right eye images reach the eyes on the corresponding side. The principle of perception is the same as described above.

[0008] On the other hand, the "pseudo-volume method" forms a real image or a virtual image with a sense of depth in front of the eyes, and typical examples thereof include a modified "holographic type" and a "vibrating screen type". ing.

[0009] Among them, in the "holographic type", in addition to a method of applying a reference beam to a continuous hologram film on which interference fringes are recorded according to the principle of holography, a method of forming hologram data on an LCD, an acousto-optical device ( AO
There is a method of passing and interfering a laser beam with the diffraction grating according to M).

FIG. 17 shows a conventional example using AOM.
Each of the AOMs 121R, 121G, and 121B includes a crystal unit and a piezoelectric unit. When the piezoelectric unit is driven at a high frequency based on the calculation result of the computer 122, a traveling wave corresponding to the drive frequency is generated inside the crystal of the AOM. Therefore, here each A
When a red laser 122R, a green laser 122G, and a blue laser 122B are applied to the OM, respectively, the OM is diffracted by a change in the refractive index of the crystal part due to the traveling wave. If the state of this diffraction is controlled by a change in the driving frequency, the OM becomes a hologram. Holography can be reproduced. Then, if the holography by each color laser is combined on the same optical axis by the beam combiner 123 in which half mirrors are arranged in series, the color holography is reproduced.

However, this holography is only a line image because the AOM is a one-dimensional hologram, and is scanned by the galvanometer mirror 124 and the polygon mirror 125.
The observer 126 perceives holography having a normal volume.

FIG. 18 shows a conventional example using an LCD.
In this example, the basic principle is the same as that shown in FIG. 17, but instead of using AOM as a hologram forming medium as shown in the previous figure, an LCD is used for the same medium.

The computer 131 sends a pattern such that a hologram pattern is formed on the LCDs 132A and 132B.
The holography of each small area is formed by interfering with the pattern on the LCD through 6. These are fixed mirror 1
Combined on 37, the observer 138 perceives holography in a large area. In this example, when it is desired to increase the hologram surface, the number of small area LCDs is increased, or the angle of incidence on the observer is changed by scanning with the movable mirror 134.

The "vibrating screen type" reproduces physical depth information by photographing an object reflected on a film-like mirror vibrating at about 1 KHz and projecting this on a screen vibrating in synchronization with the vibrating mirror. How to

FIG. 19 shows a conventional example of a vibrating screen type. The reflected light is guided to the imaging vibration mirror 143 via the object light half mirror 142 from the observation target 141 and reflected by the camera 1.
Photographed at 44. The image modulated by the photographing vibration mirror 143 is projected on the observation vibration mirror 146 by the projector 145. Since the photographing vibrating mirror, the camera, the projector, and the observation vibrating mirror are controlled synchronously by the synchronizer 147, the image photographed in a certain deformation state of the photographing vibrating mirror is Are projected at the time of the corresponding deformation state. Since these vibration states are controlled so as to be focused in the depth direction of the observation target 141, the observer 148 is controlled.
Is also an image having a corresponding depth.

[0016]

As described above, various systems for presenting an image with a sense of depth to an observer have been put to practical use. However, the above-described method has the following problems.

First, in the “binocular parallax method”, since the left and right eye images used are plane images, a binocular parallax in a place where a human obtains a sense of depth is mainly used.
It does not use the lens focus adjustment function that occurs when observing an actual perspective object. Therefore, since the observation state is different from that of natural vision, discomfort and fatigue occur at the time of observation, and it is difficult to obtain a sense of depth when the observer of one eye or both eyes has greatly different visual acuity.

In the holographic observation method of the "pseudo-volume method", the hologram in this recording form inherently has an infinite number of interference fringes recorded at a pitch of about 1 μm. The problem is the film feed accuracy for expressing Chihiro,
It is difficult to realize a mechanism for realizing moving image playback with natural motion.

Further, in a system using an LCD or an AOM, the amount of calculation is extremely enormous because it is necessary to reproduce interference fringes by calculation. Reproduction of a complicated shape is impossible because it is difficult to realize at the same time. Further, the method using a laser has problems in consideration of safety for an observer and a configuration of a high-speed scanning mechanism for scanning a linear image to form a screen.

The method using a vibrating screen is basically equivalent to a method in which a film is provided on a speaker. Therefore, when used in air, sound waves are generated by a screen that vibrates at a high speed, and it is difficult to use the screen together with the acoustic effect.

It is assumed that the observation object imaged by the photographing vibrating mirror is an object having depth information. To reproduce and observe information recorded on a recording medium, it is necessary to use the holographic method described above. It is indispensable to use depth information spatially. Further, when the photographing vibrating mirror is focused at a certain depth position of the observation object, the other depth position of the observation object is photographed as a blurred but blurred image, so that the reproduced image is always transparent (clear). Target).

The present invention has been made in order to solve the above-mentioned problems of the prior art. (1) It is possible to use the eye function, which is the basis of the perception of depth, in the same state as natural vision. (2) It is possible to perceive an image that is not transparent (substantially transparent) but has a real feeling, (3) a large screen and high-density image can be obtained, and (4) a moving image with a high update rate can be reproduced. (5) A video presenting apparatus capable of sensing a video with a sense of depth that satisfies the condition that (5) a safe light source can be used for the observer's eyes without disturbing the sound effect. The purpose is to provide.

[0023]

In order to achieve the above object, the present invention provides a video presenting apparatus which projects a plurality of divided images so that real images corresponding to the respective divided images overlap each other when viewed from an optical path direction. Source image projecting means for forming images at different positions in the optical path direction in a different positional relationship, wherein the divided images are divided into a plurality of regions formed by partitioning a space in which a presentation target object exists along a depth direction. Each of them represents a presenting object.
A source image projecting unit; and a concave mirror that reflects the image light of each of the divided images and guides the image light to an observer.

According to the present invention, the image light of each divided image emitted from the source image projection means forms a real image at a position different from each other in the optical path direction. The image light is reflected by the concave mirror and guided to the observer. The observer perceives a virtual image enlarged by the concave mirror behind the concave mirror or a real image in front of the concave mirror.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment First, a first embodiment will be described. 1 to 11 are views showing a first embodiment of the present invention.

As shown in FIG. 1, the video presenting apparatus includes a source image projecting unit 10 for projecting a source image composed of a plurality of divided images, and observes image light of each divided image projected by the source image projecting unit 10. Cylindrical mirror 30 leading to person 2
And In the present specification, a cylindrical concave mirror has a shape such that its reflection surface is cut out from a part of the inner peripheral surface of a cylinder along a generatrix (a line parallel to the axis of the cylinder), as shown in FIG. Means a concave mirror having

The video presenting apparatus has a plane reflecting mirror 25 for guiding the image light from the source image projecting means 10 to the cylindrical concave mirror 30. Image light emitted from the source image projection means 10 and reaching the observer 2 via the plane reflecting mirror 25 and the cylindrical concave mirror 30 forms an optical path A. Here, the optical path A means a light path having a predetermined width formed by the image light, strictly speaking. In this specification, the center of such an optical path is referred to as an optical path A.

A cylindrical lens 20 for horizontally expanding the image light of each divided image emitted from the source image projecting means 10 is provided between the source image projecting means 10 and the plane reflecting mirror 25 on the optical path A. ing.

The source image projecting means 10 on the optical path A
A correction optical system 1 is provided between the
5 are provided. The correction optical system 15 performs optical matching between the source image projecting means 10 and an optical system subsequent to the correction optical system 15, and has an appropriate configuration according to the specifications of the optical system constituting the video presenting apparatus. Is used.

The reason why the concave mirror is cylindrical in this embodiment is to realize a large screen that can be used in a theater or the like by the present video presenting apparatus. The concave mirror used in the present embodiment does not need to be as precise as that used for optical measurement, but in any case, a large-diameter concave mirror is not realistic for production and installation.

That is, from the viewpoint of removing aberrations, only the center of the concave mirror can be used. Therefore, it is necessary to prepare a concave mirror that is considerably larger than the size of the area actually involved in the reflection of image light. It is difficult to prepare a concave mirror of such a size. When a concave mirror is actually installed, it is necessary to adopt an installation method that takes into account deformation due to gravity.However, when the reflecting surface of the concave mirror is a spherical surface, it is extremely difficult to perform such deformation management. is there.

If the reflecting surface of the concave mirror is cylindrical as in this embodiment, it is possible to exhibit the same function as a concave mirror having a spherical reflecting surface in combination with the cylindrical lens 20. Further, the production of the cylindrical reflecting surface is easier than that of the spherical reflecting surface. Further, by setting the thrust axis (or generating line) of the concave mirror in a horizontal direction perpendicular to the direction of gravity (see FIG. 1) or in the same vertical direction as the direction of gravity (see FIG. 14), the deformation of the reflecting surface due to gravity can be reduced. Management becomes easy. For the reasons described above, a cylindrical concave mirror is used in the present embodiment.

However, the problem described above becomes apparent when a large-diameter reflecting surface is required, that is, when a large screen is to be presented, and when a relatively small screen is presented. For example, a concave mirror having a spherical reflecting surface may be used instead of the cylindrical concave mirror 30. In addition,
In this case, the cylindrical lens 20 becomes unnecessary.

In the video presenting apparatus having such a configuration, the image light of each of the divided images independently and simultaneously projected from the source image projecting means 10 is expanded in the horizontal direction by the cylindrical lens 20 and the plane reflecting mirror 25
And is guided toward the cylindrical concave mirror 30. Each image light forms a real image magnified in the horizontal direction on the optical path A in front of the cylindrical concave mirror 30. Further, each image light is reflected by the cylindrical concave mirror 30 and reaches the observer 2. This allows the observer 2 to transform the virtual image magnified in the vertical direction and having substantially the same aspect ratio as that of the original divided image into the cylindrical concave mirror 30.
(Or a real image in front of the cylindrical concave mirror 30).

The observer 2 generates virtual images (virtual images corresponding to the respective divided images) that are formed at different depth positions behind the cylindrical concave mirror 30 in different viewing directions with each other when viewed from the viewing direction. They are synthesized in the brain and perceived as one stereoscopic image with a sense of depth.

In FIG. 1, an octahedron Ra indicated by a solid line is an image of an image projected from the source image projection means, and an octahedron Rb indicated by a solid line is enlarged in a horizontal direction through a cylindrical lens 20. An octahedron Q indicated by a two-dot chain line indicates a real image formed before the cylindrical concave mirror 30, and a virtual image formed by the observer 2.

The above is the basic principle of the present invention.
This will be described in more detail.

First, the source image projecting means 10 will be described in detail. As shown in FIG. 1, the source image projecting means 10 has a plurality of projectors 11a to 11i. These projectors 11a to 11i are arranged adjacent to each other such that their optical axes face the same direction.

In FIG. 1, each of the projectors 11a to 11
Although i is arranged in the direction of the optical path A, it is not limited to this. The projectors 11a to 11i may be arranged so as to be shifted from each other in the direction of the optical path (in the front-back direction of the optical path A). Further, in FIG. 1, the number of projectors is nine, but the number is not limited to this, and may be more or less. Therefore, it is preferable to increase the number of projectors.

Each of the projectors 11a to 11i determines a plurality of divided images formed by dividing an image to be presented in the depth direction (the definition of the term "divided image" and a method of generating the "divided image" will be described later). ) Will be projected. Each of the projectors 11a to 11
The i lens is used to irradiate the illumination areas 13a to 13i of the projectors so that virtual images (or real images) formed based on the divided images from the projectors 11a to 11i overlap each other when viewed from the optical path A direction. (Refer to FIG. 8).

As the projectors 11a to 11i, a method of directly projecting an image displayed on a CRT or the like that emits light as a source image, or using an LCD or film as a source image, and irradiating the LCD or film with a backlight By doing so, a method based on a method of projecting a source image or the like can be used.

As described above, it is preferable that the number of projectors is large. However, when the number of projectors is increased, when the projectors are collectively arranged as shown in FIG. The distance between them increases. As will be apparent from the following description, it is desirable to minimize the distance between the optical axes of the projector. For this reason, as shown in FIG. 2, the projectors are divided into two groups 11A and 11B, and the light from each projector of each projector group 11A and 11B is coaxially combined by the half mirror 12. May be configured. With this configuration, the distance between the optical axes of the projectors can be substantially reduced, and the overlapping portion of the irradiation range of each divided image can be further increased. That is, the images projected from the projectors can be superimposed with little deviation.

Further, a half mirror may be incorporated in each projector to project two divided images by one projector.

From the viewpoint of preventing glare of an image during observation (to prevent glare), it is preferable that image light emitted from each projector is subjected to diffusion processing. For this reason, for example, in a backlight irradiation type projector, it is preferable to insert a transmission type diffusion plate between the light source (backlight) of the projector and the LCD or film (source image).

The source image projecting means 10 is controlled by the projector group control means 40 based on image information to be projected provided by the image updating means 30 shown in FIG.

As shown in FIG. 3, the image updating means 30 includes a plane image holding means 31 for holding data relating to a plane image inputted from the outside, and a plane image holding means 31 based on the data concerning the plane image received from the plane image holding means 31. A divided image generating unit 32 that analyzes depth information of an image and generates a divided image for each depth; a divided image holding unit 33 that holds the divided images for each depth generated by the divided image generating unit 32; And a divided image correcting unit 34 for correcting the magnification of the image and the mutual positional relationship.

Further, the image updating means 30 has a projector allocating means 35 for allocating each divided image to the projectors 11a to 11i.
And a projector optical system variable setting means 36 for adjusting variables that can be adjusted for the lenses of the projectors 11a to 11i, for example, variables such as aperture, magnification, and focal length.

Also, depending on the number of divisions when generating a divided image, one projector may be used to project a plurality of divided images, or some projectors may not be used. According to these situations, it is necessary to adjust the update rate of the image projected by each projector per unit time. For this reason, the image updating means 30 has a projector frame number setting means 37 to achieve the object.

Data representing the projection conditions calculated and set by the image updating means 30 is transmitted to the projector group control means 40, and the projector group control means 40 determines whether each of the projectors 11a to 11i is appropriate based on this data. Such a divided image is projected.

Next, the operation of the present embodiment having such a configuration will be described. It should be noted that the video presented by the video presenting apparatus includes not only a still image but also a moving image as a matter of course. In the following description, for simplification of description, a case where one frame of a still image or a moving image is projected will be described. I do. Therefore, in the case of a moving image, the image update rate may be determined by the frame number setting means 37 of the projector, and the image of each frame may be sequentially presented.

The operation of the present embodiment differs depending on the mode of the source image input to the image updating means 30. That is, when the source image input to the image updating unit 30 is already a divided image (for example, when the source image is obtained by the photographing device 70 shown in FIG. 15), the data of the source image is divided. The image may be directly input to the image correcting unit 34. However, when the source image input to the image updating unit 30 is a planar image (a planar image captured by a general cinema film, a video tape, or a normal CCD), The data of the plane image is input to the plane image holding means 31, converted into digital data, and temporarily stored. The data of the plane image is transmitted one frame at a time to the next divided image generating means 32, and the divided image generating means 32 generates divided images projected by the projectors 11a to 11i.

As a method for obtaining the above-mentioned divided image, based on a plane image such as a photograph, the size of each object image included in the plane image and the known size of the object shown in the plane image are determined. What is necessary is just to estimate the positional relationship of the object and calculate it. Alternatively, it may be obtained directly by using an imaging device 70 (see FIG. 15) described later in the description of the fifth embodiment.

Hereinafter, a case where the plane image is as shown in FIG. 6A and the object to be presented is found to be an octahedron 8 as shown in FIG. A method for creating a divided image will be specifically described.

First, in describing this, an XYZ orthogonal coordinate system is set as shown in FIG. The octahedron 8 has a square bottom on the YZ plane and is formed by combining two square pyramids whose vertices are on the X axis. It should be noted that the divided image to be obtained below is determined by the observer at the viewpoint 3 on the X axis.
Is created on the assumption that the octahedron 8 is viewed with a line of sight coincident with the X-axis.

First, as shown in FIG. 5, the depth direction (X
The octahedron 8 is cut by divided planes M1 to M4 parallel to the YZ plane and spaced apart from each other along the axial direction).

As will be understood from the following description, the greater the number of divisions when generating a divided image, that is, the greater the number of division planes set, the better a stereoscopic image can be presented. Further, due to the visual characteristics of human beings, the closer to the viewpoint 3 among the presented images, the more easily the image defect such as distortion is easily recognized. Therefore, the distance between the divided planes should be closer as the viewpoint 3 is closer. Is preferred. However, in the present description, the number of divided planes is set to four for simplification of the description.

After the division plane is set in the above manner, first, an image representing the octahedron 8 on the near side (positive X-axis direction) of the first division plane M1 (hatched in FIG. 6B). Area). In FIG. 6B, nothing is recorded since there is no object in an area other than the hatched area. The first divided image P1 is a combination of the area where no object exists and the area where the image of the octahedron 8 is recorded. Note that data representing the first divided image P1 is D1.

Next, data D2 of an image representing the octahedron 8 on the near side of the second division plane M2 is recorded. Then, the data D1 is excluded from the data D2. The second divided image P2 is determined by D2-D1 (see FIG. 6C). Similarly, the octahedron 8 on the near side of the third division plane M3
Is recorded. Then, the data D2 is excluded from the data D3. The third divided image P3 is determined by D3-D2 (see FIG. 6D).

Similarly, the image data D4 representing the octahedron 8 on the front side of the fourth division plane M4 is recorded. Then, D3 is excluded from the data D4. The fourth divided image P4 is determined by D4-D3. Since all data D4 is included in data D3, divided image P4
Does not include any information on the octahedron 8 (see FIG. 6E).

As understood from the above description,
A divided image is an image that displays a presentation target included in a region defined by divided planes adjacent to each other. In addition, in the divided image, only a part that is visually perceived when viewing the presentation target object from a set viewpoint is displayed,
The internal structure of the presentation object is not displayed unless observed from the surface. Accordingly, each of the divided images obtained as described above has no overlapping portions except for the outline.

The divided images P1 to P4 generated by the divided image generating means 32 as described above are transmitted to the divided image holding means 33 and temporarily stored, and then transmitted to the next-stage divided image correcting means 34. The correction (magnification correction and position / phase correction) of each divided image is performed so that an observer can perceive an image having an appropriate depth in consideration of an optical system included in the video presenting apparatus. Among them, the magnification correction not only enlarges the entire divided image uniformly (isotropic enlargement), but also enlarges only in the vertical or horizontal direction (anisotropic), and further, if necessary, for each part of the divided image. This includes enlargement under conditions where magnifications are different from each other. Hereinafter, the correction process will be described in detail.

When the observer 2 wants to perceive an image without distortion, a virtual image Q1 formed behind the cylindrical concave mirror 30 is formed.
ＱQ3 (the virtual image Q4 corresponding to the divided image P4 is not formed because the divided image P4 does not include image information) (see FIG. 7), the image portion of each of the divided images P1 to P3 (see FIG. ) To (d), the dimensional ratio of the hatched area) must be maintained. The shapes of the virtual images Q1 to Q3 must be similar to the image portions of the divided images P1 to P3. Positional relationship of virtual images Q1 to Q3 with respect to line of sight (interval between virtual images Q1 to Q3)
Must correspond to the positional relationship between the cutting planes M1 to M3 used when forming the divided images P1 to P3. In addition, each virtual image must be formed such that the outlines of the adjacent virtual images overlap each other.

The above items required for the virtual images Q1 to Q3 are represented by virtual images Q′1 to Q′1 shown by broken arrows in FIG.
'3. FIG. 9 shows desired virtual images Q′1 to Q ′.
The shape and dimensions of the real images R1 to R3 (real images R1 to R3 correspond to the real image Rb shown in FIG. 1) to be formed on the front side of the cylindrical concave mirror 30 in order to obtain No. 3 are shown. ing. Note that the coordinate axes shown in FIG.
These correspond to the coordinate axes shown in FIG. These virtual images Q'1
To Q'3 are to be displayed within the viewing angle ψ of the observer, and when the virtual images Q'1 to Q'3 are formed out of the viewing angle さ れ る, they are perceived by the observer. Part of the image is missing.

Here, in each of the dashed arrows indicating the virtual images Q'1 to Q'3, points L'1 to L'3 to and points N'1 to N '
'3 indicates points indicating both ends of the virtual images Q'1 to Q'3, and points M'1 to M'3 indicate midpoints of the broken arrows Q'1 to Q'3.

In the solid arrows indicating the real images R1 to R3, points L1 to L3, M1 to M3, and N1 to N3 are:
Points L'1 to L'3, M'1 to M'3, N'1
This is a point corresponding to N′3.

As shown in FIG. 9, desired virtual images Q'1-Q '
Real images R1 to R3 required to form '3
The following is required for R3.

First, it is necessary to make the sizes of the real images R1 to R3 different from each other. This means that the image must be projected after correcting the vertical magnification of each of the divided images P1 to P3 so that the enlargement ratio increases in the order of P1, P2, and P3.

Second, as can be seen from the fact that the length of the line L1M1 in the real image R1 is longer than the length of the line M1N1 (the same applies to the real images R2 and R3), at least each of the divided images P1 to P3 It is necessary to perform correction at different magnifications with the point M1 as a boundary.

Third, the real images R1 to R3 need to be formed on a curved surface.

As described above, the following correction is performed on each divided image as an example in accordance with the items required for the real images R1 to R3. The correction method may be selected appropriately in accordance with the optical characteristics of each component of the video presenting apparatus, the shape and size, and the mutual arrangement mode.In addition to the correction method described below, an electrical image processing method or It is also possible to make corrections by optical methods so as to satisfy the above requirements.

[First Correction Method] First, the cylindrical reflecting mirror 30
Is relatively large, and the angle θ formed between the optical path A of the image light entering the cylindrical reflecting mirror 30 and the optical path A of the image light exiting from the cylindrical reflecting mirror 30 is relatively small. . In this case, even if the real images R1 to R3 are not curved but are planar images, the curvature of the formed virtual images Q′1 to Q′3 and the discontinuity of the magnification in the vertical direction are ignored for human observation. It is as much as possible.

Therefore, in this case, each of the virtual images Q'1 to Q'3
Note that only the outline portions of
R3 may be corrected, and the real images R1 to R3 may be formed on a plane.

Therefore, as shown in FIG.
1 to R3 may be approximated by linear arrows R'1 to R'3, and the vertical magnification of each of the divided images P1 to P3 corresponds to the ratio of the lengths of the linear arrows R'1 to R'3. The correction may be made as follows.

However, in this case, the curved arrows R1 to R3
The points M1 to M3 serving as the position references are linear arrows R'1 to R '
It is necessary to perform a correction to change the mutual positional relationship between the divided images P1 to P3 so that the positions are shifted to the midpoints M1a to M3a of '3.

[Second Correction Method] The second correction method is performed by further dividing each of the divided images P1 to P3 into a plurality of divided images (re-divided images). Each of the re-divided images is projected so as to form a real image at a position indicated by arrows R1a to R1e in FIG.
1 can be expressed.

This method is effective when the application of the first correction method is not sufficient, for example, when a very large image is presented.

However, in executing this method, the number of re-segments is limited by the number of projectors and the range adjustable by the optical system group. Therefore, even with this correction method, it is impossible to obtain a completely curved real image, so that when obstructing observation, the radius of curvature of the cylindrical concave mirror 30 should be increased, and the cylindrical concave mirror 30 should not be used. It is effective to change the dimensional shape of the optical system in such a manner that the angle θ formed between the optical path A of the image light incident on the optical path A and the optical path A of the image light emitted from the cylindrical concave mirror 30 is reduced.

As shown in FIG. 8, since the range covered by the angle of view of each projector is slightly shifted, the position of the image portion is shifted vertically and / or horizontally for each divided image. Done.

In the above description of the correction method, as shown in FIG. 9, a real image is formed on the cylindrical concave mirror 30 side from the position of the focal point F of the cylindrical concave mirror 30 so that the observer can be behind the cylindrical concave mirror 30. The case where the user senses an image (virtual image) has been described. On the other hand, when the real image is formed farther than the position of the focal point F of the cylindrical concave mirror 30, the viewer feels an image as if the observer had jumped out of the cylindrical concave mirror 30 in front of the cylindrical concave mirror 30. Will be. In this case, the perceived real image is an inverted image, and the correction must be performed in advance before the image light enters the cylindrical concave mirror 30.
The divided image correcting means 34 performs inversion processing of the divided images on each divided image in advance. This correction is performed by the correction optical system 1 instead of the arithmetic processing by the divided image correction unit 34.
5 may be performed by optical adjustment.

It is practically difficult to completely adjust the optical systems constituting the video presenting apparatus. Further, this video presenting apparatus is based on the premise that observation is performed from a preset viewpoint, but the observer may move slightly from a predetermined position. In such a case, portions other than the outline of each divided image may overlap each other, or a gap may be generated between outlines adjacent to each other. In particular, when a gap occurs, the observer feels a sense of discomfort in the image.

Therefore, it is preferable to display the non-divided whole image Pi at the back of the divided image displaying the deepest part. As shown in FIG. 5, this non-divided whole image Pi
4 is obtained by setting a division plane Mi at the back of the recording plane 4 and recording image data D5 representing the octahedron 1 on the front side of the division plane Mi. This undivided whole image Pi is divided image P1
To P4. (See FIG. 6 (f)).

Then, as shown in FIG. 7, the non-divided whole image P
By projecting the non-divided whole image Pi simultaneously with each divided image so that the virtual image Qi corresponding to i is formed behind the virtual image corresponding to each divided image P1 to P4, the gap between the combined divided images is reduced. Can be interpolated. Note that the same correction as that performed by the divided image correction unit 34 is performed on the non-divided whole image Pi.

If the non-divided whole image Pi is displayed in the same manner as each divided image, the non-divided whole image Pi may interfere with the divided image and hinder the perception of the depth. It is preferable that the image Pi be achromatic or the density of the image be reduced.

Each divided image corrected by the divided image correcting means 34 is allocated to each projector by the projector allocating means 35. In this case, since the number of divided images is 4, the images are allocated to, for example, the projectors 11a to 11d. When simultaneously projecting the non-divided whole image Pi described above, the non-divided whole image Pi is assigned to another projector, for example, the projector 11e.

Next, the projector optical system variable setting means 36
The image light corresponding to each of the divided images P1 to P4 finally has virtual images Q1 to Q3 (see FIG. 7) behind the cylindrical concave mirror 30 at appropriate positions different from the line of sight of the observer (see FIG. 7). The parameters (aperture, magnification, focal length, etc.) of the lenses of each of the projectors 11a to 11d are adjusted so as to form a virtual image Q4 corresponding to the divided image P4 because the image information is not included.

When the video to be presented is a moving image,
The update rate of the image projected per unit time is then set by the projector frame number setting means 37.

Then, each of the projectors 11a to 11d projects image light corresponding to each of the divided images P1 to P4. Thereby, the observer 2 perceives the virtual images Q1 to Q3 corresponding to the respective divided images behind the cylindrical concave mirror 30, as shown in FIG. Then, the observer 2 synthesizes the virtual images Q1 to Q3 in the brain, and senses an image with a sense of depth (octahedron Q shown in FIG. 1).

Since the resolution in the depth direction of the presented video depends on the number of divisions in the depth direction, that is, the number of divided images, the resolution in the depth direction basically depends on the number of projectors. However, when it is desired to obtain a resolution in the depth direction that is equal to or greater than the number of projectors, one projector may have a plurality of divided images.

For example, if the number of divided images is twice the number of projectors, two images to be presented at adjacent depth positions
One divided image may be assigned to each projector as one set. Then, each of the projectors may sequentially project the near side divided image and the back side divided image. In this case, it is necessary to switch the focal position of the lens of each projector in accordance with this, but this processing may be performed by the projector optical system variable setting means 36. By sequentially projecting the near-side divided image and the back-side divided image at a sufficiently short image update rate, the resolution in the depth direction can be improved without causing the human eyes to feel uncomfortable.

In the present video presenting apparatus, a sound effect having a sense of depth can be added by adding image information for each depth, that is, information of a divided image, to audio information for each depth. That is, for example, as shown in FIG. 1, a speaker group is arranged along the line of sight in a region where a virtual image is formed, and information of a divided image for each depth is sent to the projector control unit 40 by the image updating unit 30. By transmitting the audio information to the speaker group control means 41 in synchronization with this, it is possible to simultaneously obtain a video with a sense of depth and a sound effect with a sense of depth adapted to the image.

As described above, according to the present embodiment, a new image presentation device of the “pseudo volume method” using both “binocular parallax” and “focus adjustment” of the crystalline lens as human visual functions. A configuration can be realized. This allows the observer to perceive an image with a sense of depth in a state closer to natural vision, and furthermore, can perceive a certain degree of depth even when the eyes of the observer have different eyesight. Becomes

Further, since the source image is observed by being enlarged in the vertical direction by the cylindrical concave mirror and in the horizontal direction by the cylindrical lens, the sense of depth is independent of the size of the original source image. It is possible to magnify and view large images.

Further, since only a region corresponding to each depth position is displayed and a plurality of divided images having no overlapping region other than the contour portion are superimposed to present an image, a holographic or vibrating screen is displayed. It does not produce a transparent (transparent) image as seen in the system.

Further, since a general film image, CRT image and LCD image can be used as a source image as it is, an image in a state where the image density of a normal plane image is maintained can be presented.

Also, since it is not necessary to use a hologram as a medium for presenting a source image, it is not necessary to use a laser as a light source. Therefore, it is possible to safely observe the video. Further, since there is no need to use special elements, the manufacture of the entire apparatus is easy. Further, since no loud noise as in the vibrating screen system is generated, it is possible to dispose speakers corresponding to each position of the established depth image.
It can also add an acoustic depth.

Second Embodiment Next, a second embodiment will be described with reference to FIG. The second embodiment differs from the first embodiment in that the arrangement of the projectors 11 of the source image projecting means 10 is different and that additional components are provided due to this. Differently, the configuration after the cylindrical lens 20 is the same as that of the first embodiment. In the second embodiment, description of the configuration after the cylindrical lens 20 will be omitted.

In the present embodiment, each of the projectors 11a to 11i (refer to FIG. 1 for the reference numerals of the projectors) constituting the source image projecting means 10 is such that only the optical axis of the projector 11e disposed at the center is an image. The optical axes of the other projectors 11a to 11d and 11f to 11i arranged so as to coincide with the optical path A of the presentation device and arranged around the projector 11e intersect at one point P on the optical axis of the projector 11e. Are arranged in a relationship.

In the following, in order to facilitate the explanation, the projectors 11d, 11e and 11f in the middle stage are extracted and shown in FIG.
This will be described below. As shown in FIG. 12, the projector 11d and the projector 11f are positioned on both sides of the projector 11e such that their optical axes intersect at a point P on the optical axis A of the projector 11e. They are arranged symmetrically with respect to each other.

In the vicinity of the point P and on the projector side,
Projector 11e composed of a concave lens or a concave lens
(That is, the optical path A of the image presenting apparatus). The parallel proximity optical system 50 is connected to each of the projectors 11d, 11e, 11
Lights representing the divided images incident from f are emitted in parallel and close to each other.

It is important that the image light be incident on a narrow region near the optical axis of the parallel proximity optical system 50 in order to prevent distortion of the image light when passing through the parallel proximity optical system 50. Therefore, in order to reduce the divided image light projected from each projector and prevent the divided image light from spreading on the way to the parallel proximity optical system 50, each of the projectors is provided with a magnification changing parallel optics. A system 51 is provided.

On the opposite side of the parallel proximity optical system 50 from the projector, a correction optical system 15 and a cylindrical lens 20 are sequentially arranged. Each divided image light emitted from each projector and passed through the parallel proximity optical system 50, the correction optical system 15, and the cylindrical lens 20 passes through the reflecting mirror 25 and the cylindrical concave mirror 30 in the same manner as in the first embodiment. Proceed sequentially. Then, the observer perceives an image having a sense of depth on the back side or the near side of the cylindrical concave mirror 30.

According to the present embodiment, each projector can be arranged at an interval from each other. Therefore, the dimensions of the light source mechanism of the projector and the supply mechanism of the source image are large,
Even if it is difficult to make the projector compact,
The optical axes of each projector can be substantially close.

Third Embodiment Next, a third embodiment will be described with reference to FIG. The third embodiment differs from the second embodiment in the configuration of the source image projecting means, and is otherwise substantially the same as the second embodiment. In the third embodiment, the same parts as those in the second embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 13, the source image projecting means 60 has a cathode ray tube 61 as an example of an integrated video presenting medium. The CRT 61 displays the divided images in different areas on the display surface 62 thereof. That is, the display surface 62 of the cathode ray tube 61 has a display area 62b whose center coincides with the optical path A of the video presenting apparatus, and display areas 62a and 62c located on both sides of the display area 62b.

The display area 62 at the center of the display surface 62
On the surfaces of the display areas 62a and 62c other than 2b, wedge prisms 63a and 63c are provided as an example of the optical axis refracting means. These wedge prisms 63a and 63c intersect the optical axes of the divided image light projected from the display areas 62a and 62c at one point P on the optical path A of the video presenting apparatus, as in the third embodiment. To bend.

Further, a near-parallel optical system 50 is disposed at a position similar to that of the third embodiment in front of the point P.

Further, wedge prisms 53a and 53a
A magnification changing parallel optical system 51 is provided at the end of 3c and the center of the display area 62b.

Fourth Embodiment Next, a fourth embodiment will be described with reference to FIG. In the fourth embodiment, one video presenting device is configured by combining a plurality of the video presenting devices described in the first embodiment. In the fourth embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 14, the video presenting apparatus 1 according to the fourth embodiment is composed of the video presenting apparatuses 1a, 1b and 1c according to the first embodiment.
The cylindrical concave mirrors 30 of the respective video presenting apparatuses 1a, 1b, 1c are arranged adjacent to each other. In addition, each cylindrical concave mirror 30
Are oriented in the vertical direction, and the cylindrical concave mirror 30 enlarges the image in the horizontal direction.

Accordingly, each of the video presenting devices 1a, 1b,
The cylindrical lens 1c is arranged so that its generatrix faces in the horizontal direction, and the cylindrical lens 20 enlarges the image so as to enlarge the image in the vertical direction.

The image light projected from the source image projecting means 10 of each of the video presenting devices 1a, 1b, 1c forms optical paths Aa, Ab, Ac which reach the observer 2 via the cylindrical lens 20 and the cylindrical concave mirror 30, respectively. I do. Therefore, the observer 2 can see the same image at a plurality of different observation points.

As described above, according to the present embodiment, it is possible to provide the video presenting apparatus 1 that can be observed by a plurality of persons. That is, when only one video presenting apparatus 1a is used, when the viewpoint position of the observer is shifted from a predetermined position, as described above, the contour line of each divided image which should originally match is shifted or the observation There is a tendency that the image perceived by the user is distorted. This means that, particularly when the cylindrical concave mirror 30 is small, the range in which a good image can be observed is narrowed, and the number of observers is limited. However, according to the present embodiment, since there are a plurality of places where a good image can be observed, a plurality of persons can each observe a good image. In addition, by increasing the number of the video presenting devices 1a, 1b, 1c, it is possible to observe the video by a larger number of people.

Furthermore, each of the video presenting devices 1a, 1b, 1c
Different images are projected from the source image projecting means 10 of each of the above, and one observer changes the observation position to change each cylindrical concave mirror 30.
For example, if an image of a certain object taken from various angles is presented to the image presenting devices 1a, 1b, and 1c, it is possible to look around the object. Becomes

Fifth Embodiment Next, a fifth embodiment will be described with reference to FIG. The fifth embodiment shows an embodiment of a photographing apparatus suitable for photographing a source image used in the video presenting apparatus described above.

As shown in FIG. 15, the photographing apparatus 70 comprises an image forming means 71 having a lens 72 and a diaphragm 73, a polygon mirror 74, and three CCDs (charge coupled devices) 75a, 75b, 75c.

The lens 72 is composed of a large-diameter bright lens, that is, a lens having a substantially small depth of focus. This lens 72 has a focus adjustment mechanism.

The polygon mirror 74 has a plurality of reflection surfaces 74.
a to 74e so as to rotate around a rotation shaft 74x.

Further, the rotating shaft 74x and the reflecting surfaces 74a to 74a-7
4e, the rotation axis 74x and each CCD 75
The positional relationship between the rotation axis 74x and each CCD is as follows: (1) The distance between the rotation axis 74x of the polygon mirror 74 and each of the reflection surfaces 74a to 74e is different from each other;
The relationship that the distances between the imaging surfaces 75a, 75b, and 75c are different from each other is established.

The positional relationship is not limited to the above relationship (1). (2) The rotation axis 74x and each reflection surface 74
a to 74e are different from each other, and the rotation axis 7
(3) The distance between the rotation axis 74x and each of the reflection surfaces 74a to 74e is equal to each other, and the rotation axis 74x and each of the CCDs 75a, The distance between the imaging surfaces 75b and 75c may be different from each other.

Note that even if the above positional relationship is changed, the CCD 85 passes through the reflection surface of the polygon mirror 74 from the object 85 to be imaged.
Only the number of combinations of the optical path lengths reaching the image pickup surface is different, and the operation principle of the imaging device 70 is not different. In the present embodiment, the relation (1) in which the number of combinations of optical path lengths is the largest is adopted.

The CCDs 75a, 75b and 75c are connected to a signal holding means 76 for temporarily storing signals photoelectrically converted by the CCDs. further,
A divided image forming unit 77 and a non-divided whole image forming unit 78 are sequentially connected to the signal holding unit 76, and a video transmission unit 79 is connected to the divided image forming unit 77 and the non-divided image forming unit 78. .

The image forming means 71 is connected to a focus / aperture control means 80 for controlling the focal position of the lens 72 and the aperture value of the diaphragm 73. In addition, polygon mirror 7
4 is controlled by the optical path switching control means 81.

The signal holding means 76, the focus / aperture control means 80 and the optical path switching control means 81 are controlled by a predetermined clock signal generated by the synchronization control means 82.

Next, the photographing apparatus 7 having such a configuration will be described.
The operation of 0 will be described.

The object light from the object 85 to be imaged is
1 and one of the reflection surfaces of the polygon mirror 74, and reaches one of the imaging surfaces of the CCDs 75a, 75b, and 75c.

First, the in-focus position of the lens 72 is adjusted so that object light from a part of the object to be imaged 85 having a predetermined distance from the lens 72, for example, a part corresponding to the point P2 in FIG. The CCDs 75a and 75 pass through one of the reflecting surfaces of the mirror 74, for example, the reflecting surface 74a.
b, 75c, for example, a CCD 7
The image is focused on the imaging surface 5a.

When the aperture 73 is opened, the depth of focus of the lens 72 is very shallow, so that only a part of the object to be imaged 85 that passes through the cutting line passing through the point P2 and a small part of the periphery thereof are the CCD 75a. An image is sharply formed on the imaging surface. On the other hand, other parts of the imaging target 85 are captured by the CCD 75a in a so-called out-of-focus state. That is, in this state, the lens 72 is
14 through the imaging means 71 and the reflection surface of the polygon mirror 74, and sequentially to the imaging surface of the CCD (the "total optical path length" means the length of the line segment P2Q and the length of the line segment QR in FIG. 14). This means that an image is formed on the imaging surface of the CCD only when the condition that the optical path length corresponding to the optical path length is constant is satisfied.

Here, when the polygon mirror 74 is rotated so that, for example, the body light from the imaging object 85 is incident on the CCD 75b, a portion of the imaging object 85 having a total optical path length equal to the above-described total optical path length is obtained. For example, only a portion passing through a cutting line passing through the point P3 and a small portion around the portion are C
An image is sharply formed on the imaging surface of the CD 75a.

As described above, by selecting the CCD that guides the object light by rotating the polygon mirror 74, and changing the optical path length QR between the polygon mirror 74 and the CCD, different portions of the object 85 to be imaged are selected. Can be selectively formed sharply on the imaging surface of any of the CCDs.

In addition to the above, the focus adjustment mechanism of the lens 72 is used to perform multi-step adjustment of the in-focus position of the object light, and the multi-step adjustment of the lens 72 is selectively performed by rotating the polygon mirror 74 to select the optical path length QR. By combining these changes, it is possible to obtain an image in which the imaging target 85 is further finely divided in the optical path A direction (that is, the depth direction).

The photographing device 70 is controlled as follows based on the operation principle described above. That is, each CCD
Are temporarily stored by the signal holding unit 76, and then transmitted to the successively divided image forming unit 77. The transmission timing is determined based on a clock signal transmitted from the synchronization control means 82.

The divided image forming means 77 leaves only the data of the sharply formed part of the obtained image,
An operation for removing data of a so-called out-of-focus portion is performed.

Next, as described in the first embodiment, the divided image forming means 77 corrects in advance the essential distortion of the perceived image caused by the configuration of the optical system of the image presenting apparatus. In this manner, the correction calculation of the reference position of the image is performed.

Next, the non-divided whole image forming means 78 performs an operation of synthesizing each of the divided images for each depth to obtain the first image.
The non-divided whole image described in the embodiment is synthesized.

In place of the method of synthesizing the divided whole images for each depth, the stop 73 of the image forming means 71 is sufficiently stopped down.
By capturing an image in a state where the depth of focus of the entire imaging unit 71 is sufficiently large, a non-divided whole image may be obtained. How to obtain the non-split whole image may be appropriately selected according to the type of the imaging target, and this selection is executed by the non-split whole image forming unit 78.

The data of the divided image (and the non-divided whole image) formed by the divided image forming means 77 and the non-divided whole image forming means 78 is transmitted to the video presenting apparatus 1 via the video signal transmitting means 79. Video presentation device 1
Thus, the user can perceive an image with depth. The signal of the divided image to be sent to the video signal transmitting means 79 may be stored in an appropriate recording medium.

The images (divided images) of different depths acquired by the image pickup device are selected by the signal holding means 76 as described above, but the adjustment of the lens and the aperture is made by the focus / aperture control means 80 and the polygon is adjusted. The intermittent rotation control of the mirror is performed by the optical path switching control means 81. In order to realize an appropriate combination of these elements, accurate synchronization control is performed by the synchronization control unit 82 in each of the above units.

By the way, CC used as an image pickup device
Since D can capture an image in a short time of about 1/1000 second, even when the polygon mirror is rotated at a high speed,
Each CCD can cooperate well with the polygon mirror 74. Then, by transmitting the image obtained by each CCD to the signal holding means 76 and temporarily storing the image, it is possible to capture an image for each depth substantially in real time.

For example, NTSC (National Television)
Assuming an image update rate based on the System Comitee method, the time per frame is 1/30 second. Here, the switching of the reflection surface of the polygon mirror is 1 /
If the operation is performed in 1000 seconds or less (for example, the number of reflection surfaces of the polygon mirror is 16 and the polygon mirror 3600r
This is possible when the number of CCDs is n), and when the number of CCDs is n, it is possible to obtain an image having a depth of 33 × n per second.

In practice, the number of images obtained is limited by the performance of the lens and the speed at which the image signal from the CCD is processed. It is possible to achieve.
Further, as described above, the resolution in the depth direction can be further increased by combining the multi-step adjustment of the focal position of the lens.

As described above, according to the present embodiment,
As a photographing method, a method of forming various optical path lengths by using a deformed polygon mirror, a plurality of image sensors, and a movable lens having a small depth of focus, thereby photographing an object to be photographed so as to scan in the depth direction is used. Thereby, a divided image having a sufficient depth resolution can be obtained by real-time imaging.

Further, by cooperating with the video presenting apparatus shown in the first embodiment, real-time observation of a video with a sense of depth, which is impossible by holography, becomes possible.

[0144]

As described above, according to the present invention,
An image presentation device that can use the eye function that is the basis for obtaining a sense of depth under the same conditions as natural vision, can obtain a real image, and can realize a large screen and high-density image Can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a video presenting apparatus according to the present invention.

FIG. 2 is a diagram showing another arrangement of the projector.

FIG. 3 is a diagram showing a configuration of a control system of the video presenting device.

FIG. 4 is a view for explaining a method of generating a divided image.

FIG. 5 is a diagram illustrating a method for generating a divided image.

FIG. 6 is a diagram illustrating a method for generating a divided image.

FIG. 7 is a diagram showing a virtual image formed as a result of projecting a divided image. The X-axis in this figure corresponds to the optical path A connecting the observer 2 and the cylindrical concave mirror 30 in FIG.

FIG. 8 is a view showing an overlap of angle of view of each projector.

FIG. 9 is a diagram illustrating a correction process of a divided image.

FIG. 10 is a diagram illustrating a correction process of a divided image.

FIG. 11 is a diagram illustrating a correction process of a divided image.

FIG. 12 is a view showing a second embodiment of the video presenting apparatus according to the present invention, and showing another arrangement of the projector.

FIG. 13 is a diagram showing a third embodiment of the video presenting device according to the present invention, and is a diagram showing another embodiment of the source image projecting means.

FIG. 14 is a diagram showing a fourth embodiment of the video presenting apparatus according to the present invention.

FIG. 15 is a diagram illustrating a fifth embodiment of the present invention, and is a diagram illustrating a configuration of a photographing device suitable for use with the video presenting device according to the present invention.

FIG. 16 is a diagram showing a conventional video presenting device.

FIG. 17 is a diagram showing a conventional video presenting device.

FIG. 18 is a diagram showing a conventional video presenting device.

FIG. 19 is a diagram showing a conventional video presenting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Source image projection means 20 Cylindrical lens 30 Cylindrical concave mirror

Claims (5)

[Claims] A source image projecting means for projecting a plurality of divided images and forming real images corresponding to the respective divided images at mutually different positions in the optical path direction so as to overlap each other when viewed from the optical path direction. A source image projecting means, wherein the divided images represent presentation objects present in a plurality of regions formed by partitioning a space in which the presentation object is present along the depth direction. A concave mirror that reflects image light of each of the divided images and guides the image light to an observer. 2. The method according to claim 1, wherein the divided image displays only a part of the presentation object that can be confirmed when the presentation object is viewed from the near side in the depth direction. Item 2. The video presenting device according to Item 1. 3. The divided image corresponding to the region relatively deeper in the depth direction does not include image information of the divided image corresponding to the region relatively closer to the near side. The image presentation device according to claim 1. 4. The apparatus according to claim 1, further comprising a cylindrical lens disposed on said optical path between said source image projecting means and said concave mirror, wherein said concave mirror comprises a cylindrical concave mirror, and said cylindrical lens converts said divided image into a first image. The image according to any one of claims 1 to 3, wherein the concave mirror is arranged so as to enlarge the divided image in a second direction orthogonal to the first direction. Presentation device. 5. The apparatus according to claim 1, wherein said source image projection means comprises a plurality of projectors, and two or more of the plurality of divided images are simultaneously projected by different projectors. The video presenting device according to any one of claims 1 to 4.