JP5920892B2 - Multidirectional video display apparatus and multidirectional video display method - Google Patents

Description

  The present invention relates to a multidirectional video display apparatus and a multidirectional video display method that present different videos depending on the position of an observer.

  Many devices that allow an observer to change the viewpoint position by operating the direction of a camera or switching between a plurality of cameras are used in many fields such as monitoring and WEB cameras. On the other hand, it is possible to observe by changing the angle of the image in conjunction with moving the observer's viewpoint position, instead of operating or switching the camera with a controller, buttons, etc. A video display device has been proposed (see Non-Patent Document 1, for example).

  The video display device described in Non-Patent Document 1 has an advantage that an image captured by a camera can be observed with an intuitive and high presence and presence because the position of the observer and the video are linked. On the other hand, in the video display device of Non-Patent Document 1, since the camera, the observer, and the display device are combined on a one-to-one basis, the number of users of the video display device is limited to one. That is, there is a problem that a large number of people cannot observe a remote place at the same time. In order to solve such a problem, a multi-directional video display device capable of simultaneously observing videos with different numbers of people has been proposed (see, for example, Non-Patent Document 2).

  FIG. 5 is a diagram illustrating a configuration of the multidirectional video display device described in Non-Patent Document 2. As shown in FIG. 5, images projected by the five projectors 1-1 to 1-5 can be observed in the observable areas A6, A7, A8, A9, and A10 via the screen 3. This multi-directional video display device has a feature that it has a wide observable area and has a viewing zone in which different videos can be observed without interference even if they are far from infinity in principle. For this reason, by using the multi-directional video display device shown in FIG. 5, it becomes possible for many people to observe different videos simultaneously.

Kei Kato and two others, strengthening social telepresence with movable cameras, Transactions of Information Processing Society of Japan 52 (4), 1635-1643, 2011-04-15 Shiro Ozawa, 6 others "Novel Multi-View Display using QDA Screen with Short Projection Distance by Tiled Image Method", SID Symposium Digest of Technical Papers-June 2011-Volume 42, Issue 1, pp. 894-897

  However, in the multidirectional video display device described in Non-Patent Document 2, as shown in FIG. 5, parallelogram type observation unsuitable regions B1, B2, B3, and B4 corresponding to the width of the screen 3 are formed. . There is a problem that different images interfere with each other in this observation unsuitable region. In particular, as the size of the screen 3 is increased, the width of this unsuitable region for observation becomes wider, so that the distance from the screen 3 to the closest observable position (the apex position of the triangular observable region) becomes longer. There is a problem that the installation becomes limited.

  The present invention has been made in view of such circumstances, and a multi-directional image that can reduce the observation unsuitable area and can solve the problem that the observable area becomes far away as the screen becomes larger. An object is to provide a display device and a multidirectional video display method.

  The present invention is a multi-directional video display device comprising a screen for displaying video, and a plurality of projectors arranged behind the screen and projecting video light at different projection angles with respect to the screen, The screen includes a projection video angle conversion unit that changes the angle of the video light so that a part of the adjacent observable region of the video light of each projector touches.

  The present invention relates to a multidirectional video display performed by a multidirectional video display device that includes a screen that displays video and a plurality of projectors that are arranged behind the screen and project video light at different projection angles with respect to the screen. In the display method, the screen includes a step of changing an angle of the image light so that a part of an adjacent observable region of the image light emitted from the screen is in contact.

  According to the present invention, it is possible to reduce the unobservable region and to solve the problem that the observable region becomes far away as the screen becomes larger.

It is a schematic diagram which shows the structure of one Embodiment of this invention. It is a block diagram which shows the structure of the multi-directional video display apparatus shown in FIG. It is a figure which shows the detailed structure of the screen 2 shown in FIG. It is a figure which shows the relationship between a projector, a screen, and a space imaging iris surface. It is a figure which shows the structure of the multi-directional video display apparatus by a prior art.

  Hereinafter, a multidirectional video display apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the embodiment. In this figure, the same parts as those of the conventional apparatus shown in FIG. The apparatus shown in this figure is different from the conventional apparatus in that the screen 2 is provided and the shape of the observable region is not a triangle. The multidirectional video display apparatus shown in FIG. 1 combines an infinite pentagonal observation area A1, A2, A3, A4, by combining a screen 2 formed of a plurality of optical films and five projectors 1-1 to 1-5. A5 can be configured. For this reason, at the short distance (spatial imaging iris surface) suitable for observation, the width of the region suitable for observation is maximized, and at the same time, different images even if they are far away to infinity in principle, as in Non-Patent Document 2. It has the feature of having a viewing zone that can be observed without interference.

  Next, the configuration of the multidirectional video display apparatus shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of the multidirectional video display apparatus shown in FIG. In FIG. 2, reference numeral 10 denotes a video signal output device that outputs video signals for projecting video from five projectors 1-1 to 1-5. 1 and 2 show a configuration including five projectors, the number of projectors may be increased or decreased as necessary.

  Reference numeral 2 denotes a screen composed of a plurality of optical films, which is composed of a plane having a predetermined size. The screen 2 includes a projection video angle conversion unit 21, a video horizontal diffusion unit 22, and a video vertical diffusion unit 23. Images projected from the five projectors 1-1 to 1-5 are projected on the screen 2. The projected video angle conversion unit 21 converts the light angle of the video projected by the projectors 1-1 to 1-5. The projection image angle conversion unit 21 may be an optical film such as a Fresnel lens having a focal length f.

  The video horizontal diffusion unit 22 diffuses the video that has been angle-converted by the projection video angle conversion unit 21 in the horizontal direction. A lenticular lens or the like can be used for the video lateral diffusion unit 22. The image vertical diffusion unit 23 diffuses the image horizontally diffused by the image horizontal diffusion unit 22 in the vertical direction so that the image can be observed regardless of the vertical position of the observation position. A lenticular lens or the like can be used for the image vertical diffusion unit 23.

  Next, a detailed configuration of the screen 2 shown in FIG. 2 will be described with reference to FIG. FIG. 3 is a diagram showing a detailed configuration of the screen 2 shown in FIG. In FIG. 3, reference numeral 211 denotes a Fresnel lens having a focal length f that functions as the projection video angle conversion unit 21. Reference numeral 221 denotes a lateral diffusion lenticular lens that functions as the video lateral diffusion unit 22. Reference numeral 231 denotes a vertical diffusion lenticular lens that functions as the video vertical diffusion unit 23. The screen 2 has a configuration in which a Fresnel lens 211, a lateral diffusion lenticular lens 221, and a vertical diffusion lenticular lens 231 are arranged in this order. The Fresnel lens 211 is an arrangement side of the projectors 1-1 to 1-5, and the longitudinal diffusion lenticular lens 231 is an observer side.

  Next, the geometric relationship of the screen 2 will be described with reference to FIG. FIG. 4 is a diagram illustrating a relationship among one projector 1-3 among the five projectors, the screen 2, and a spatial imaging iris surface on which an image is formed. In this embodiment, since the purpose is to reduce the horizontal unsuitable region, the diagram of the positional relationship shown in FIG. 4 is a diagram of the projector 1-3 and the screen 2 viewed from above. Further, the projector 1-3 arranged at the center of the five projectors will be described as an example, but the same applies to the other projectors 1-1, 1-2, 1-4, and 1-5.

In FIG. 4, a is the distance from the projector 1-3 to the screen 2, b is the optimum observation distance determined in advance from the screen 2 (the position of the optimum observation distance is called a spatial imaging iris surface), and W is the width of the screen (horizontal). Direction), L is the width of the viewing zone (horizontal direction) at the optimum viewing distance. Further, the focal length of the Fresnel lens 211 is f, the condensing angle of the Fresnel lens 211 is θ ₁ , and the diffusion angle of the lateral diffusion lenticular lens 221 is θ ₂ . Here, it is assumed that L> W and θ ₁ <θ ₂ .

Equations (1), (2), and (3) are established by geometric calculation.

In this case, the focal length f, the width W of the screen 2, when determined as previously constant diffusion angle theta _2, the conditions required to configure infinity pentagonal observation region C determines the L satisfying L> W , (3) is used to determine the optimum observation distance b. Then, the distance a is obtained from the equation (1) using the predetermined focal length f and the optimum observation distance b obtained by the equation (3). By adjusting the positional relationship between the projectors 1-1 to 1-5 and the screen 2 so that the distance a and the optimum observation distance b obtained by these equations are obtained, an infinite pentagonal observation region can be configured. Become. Further, the closest observable distance C (the shortest observable distance) C from the screen 2 is obtained by the equation (4).

  Thus, since the shortest observable distance C can be shortened as compared with the multi-directional video display device according to the prior art, the shortest observable distance C becomes longer according to the increase in the size of the display device, which has been a conventional problem. The problem that observation at a suitable short distance cannot be performed can be solved. In the infinite pentagonal observation areas A1, A2, A3, A4, and A5 (see FIG. 1), five different images are continuously switched without passing through the observation unsuitable area at the optimum distance b for observation. become. Further, even when observing at a distance larger than the optimum observation distance, the images at A1, A2, A3, A4, and A5 can be observed without being mixed up to infinity. Thereby, it becomes possible to give flexibility to the installation form of the display device.

  As described above, in a display device using multi-directional image expression technology, a projection image angle conversion unit (Fresnel lens) is provided in the screen, and the viewing zone is formed into a pentagonal shape, thereby realizing a wide viewing zone. And many observers can observe at the same time and in a wide range.

  As mentioned above, although embodiment of this invention has been described with reference to drawings, the said embodiment is only the illustration of this invention, and it is clear that this invention is not limited to the said embodiment. is there. Accordingly, additions, omissions, substitutions, and other changes of the components may be made without departing from the technical idea and scope of the present invention.

  The region unsuitable for observation can be reduced, and the present invention can be applied to applications where it is indispensable to solve the problem that the observable region becomes far away as the screen becomes larger.

  1-1 ... 1-5 ... projector, 2 ... screen, 21 ... projected video angle conversion unit, 22 ... video horizontal diffusion unit, 23 ... video vertical diffusion unit, 211 ... Fresnel lens, 221... Lenticular lens for lateral diffusion, 231... Lenticular lens for longitudinal diffusion, 10.

Claims (2)

A multi-directional video display device comprising: a screen that displays video; and a plurality of projectors that are arranged behind the screen and project video light at different projection angles with respect to the screen,
The screen includes a Fresnel lens having a focal length f that performs angle conversion of an image, a lateral diffusion lenticular lens that performs lateral diffusion of the image, and a longitudinal diffusion lenticular lens that performs vertical diffusion of the image,
The distance between the projector and the screen is a, the optimal observation distance determined in advance from the screen is b, the width of the screen is W, the width of the horizontal viewing zone at the optimum observation distance is L, and the collection of the Fresnel lenses. The light angle is θ ₁ , the diffusion angle of the lateral diffusion lenticular lens is θ ₂ , the closest observable distance from the screen is C, and L satisfying L> W is determined. Then, by using f and b, a is obtained by the equation (1), and further, an infinite pentagonal observation region obtained by obtaining C by the equation (3) is formed. A multi-directional video display device characterized by being in contact with each other .
(1 / a) + (1 / b) = (1 / f) (1)
tan θ ₁ = L / (2b) (2)
C = W / (2 tan (θ ₁ + θ ₂ )) (3) This is a multidirectional video display method performed by a multidirectional video display device that includes a screen that displays video and a plurality of projectors that are arranged behind the screen and that project video light onto the screen at different projection angles. And
The screen includes a Fresnel lens having a focal length f that performs angle conversion of an image, a lateral diffusion lenticular lens that performs lateral diffusion of the image, and a longitudinal diffusion lenticular lens that performs vertical diffusion of the image,
The distance between the projector and the screen is a, the optimal observation distance determined in advance from the screen is b, the width of the screen is W, the width of the horizontal viewing zone at the optimum observation distance is L, and the collection of the Fresnel lenses. The light angle is θ ₁ , the diffusion angle of the lateral diffusion lenticular lens is θ ₂ , the closest observable distance from the screen is C, and L satisfying L> W is determined. Then, by using f and b, a is obtained by the equation (1), and further, an infinite pentagonal observation region obtained by obtaining C by the equation (3) is formed. A multi-directional video display method characterized by comprising touching each other .
(1 / a) + (1 / b) = (1 / f) (1)
tan θ ₁ = L / (2b) (2)
C = W / (2 tan (θ ₁ + θ ₂ )) (3)

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