JP5398015B2 - 3D display and 3D image presentation method - Google Patents

Description

  The present invention relates to a stereoscopic display and a stereoscopic image presentation method for presenting a stereoscopic image.

  Many people gather around the table to collaborate. A table is regarded as a tool for collaborative work, and various studies have been conducted to support collaborative work using this tool using a computer. For example, research on CSCW (Computer Supported Cooperative Work) and groupware.

  Advantages of digitizing work on the table include the ability to electronically record the work process and the ability to share information between remote locations. An image displayed in the conventional research is projected onto a table by a projector, or the table itself is composed of a display such as an LCD (Liquid Crystal Display). In either case, a two-dimensional planar image is displayed.

  In such a planar image, only information such as a document can be presented, and information of a three-dimensional shape cannot be presented. Also, when a single planar image is displayed, the information is reversed depending on the position of the person surrounding the table, which is very difficult to see.

  In order to solve the above problem, a method of presenting a stereoscopic image on a table has been proposed. For example, in the stereoscopic display described in Patent Document 1, a set of virtual point light sources is formed on a table by light beams emitted from a plurality of projectors. Thereby, a stereoscopic image is presented on the table.

JP 2010-32952 A

  In order to smoothly perform joint work using a stereoscopic image, it is desired that a plurality of people can accurately recognize the stereoscopic image without a sense of incongruity. Therefore, presentation of natural and fine stereoscopic images is required.

  An object of the present invention is to provide a stereoscopic display and a stereoscopic image presentation method capable of presenting a natural and fine stereoscopic image.

  (1) A stereoscopic display according to a first invention is a stereoscopic display for presenting a stereoscopic image based on stereoscopic shape data, and has a cone shape or a columnar shape and has a cone shape or a columnar shape. A light ray controller arranged so that the bottom part opens on the reference surface, and a light ray so as to irradiate the outer peripheral surface of the light ray controller with a light ray group composed of a plurality of light rays below the reference surface and from the outside of the light ray controller. A light generator arranged around the controller, and control means for controlling the light generator so that a three-dimensional image is presented by a group of light beams generated by a plurality of light generators based on the three-dimensional shape data. The light controller is formed to transmit each light beam irradiated by the light generator without diffusing in the circumferential direction and to diffuse and transmit the light beam in the ridge line direction. A first intersection where each light beam generated by the living device intersects the outer peripheral surface of the light controller, and a light beam that passes through the light controller and diffuses by the light controller intersects the viewing zone that represents the range of the observation position. A straight line passing through the second intersection is obtained, the position of the third intersection where the obtained straight line intersects the stereoscopic image to be presented is calculated, and the color of the stereoscopic image to be presented at the third intersection is determined. While setting as the color of the light beam, the light beam generator is controlled so as to generate a light beam group composed of a plurality of light beams each having a set color.

  In the three-dimensional display, the light controller has a cone shape or a column shape. This light control element is arranged so that the bottom of the cone shape opens on the reference plane. In addition, the light generator is disposed around the light controller so as to irradiate the outer peripheral surface of the light controller with a light group composed of a plurality of light beams below the reference surface and from the outside of the light controller. Based on the three-dimensional shape data, the plurality of light generators are controlled by the control means so that a three-dimensional image is presented by a group of light beams generated by the plurality of light generators.

  Note that the cone shape is not limited to a cone, an elliptical cone, or a polygonal pyramid, and includes a truncated cone, an elliptical truncated cone, or a truncated pyramid. The columnar shape includes a cylinder, an elliptical column, and a prism.

  In this case, the light beam controller transmits each light beam irradiated by the light beam generator without diffusing in the circumferential direction. Thereby, each intersection of the light from the light generator becomes a point light source. An observer virtually perceives a set of point light sources as a three-dimensional shape of an entity. At this time, the binocular parallax occurs because the gaze direction of the left eye and the gaze direction of the right eye that intersect the same point light source are different. As a result, a stereoscopic image is presented by a set of a plurality of point light sources.

  The light beam controller diffuses and transmits each light beam irradiated by the light beam generator in the ridge line direction. Thereby, the light beam reaches a common observation position from an arbitrary position in the ridge line direction of the light beam generator with a simple configuration.

  Each light beam generated by the light beam generator intersects the outer peripheral surface of the light beam controller at a first intersection, passes through the light beam controller and diffuses at the light beam controller, and enters the viewing zone representing the range of the observation position. Cross at two intersections. The position of the third intersection where the straight line passing through the first and second intersections intersects the stereoscopic image to be presented is calculated by the control means. The color of the stereoscopic image at the calculated third intersection is set by the control means as the color of the light beam. A light ray group composed of a plurality of light rays each having a set color is generated by a light ray generator. Thereby, the color of each light beam is appropriately set according to the stereoscopic image to be presented. As a result, a natural and fine stereoscopic image can be presented to the observer.

  (2) Each of the light generators has an exit point that emits a group of rays, and the viewing zone is an annular viewing zone centered on the axis of the ray controller and perpendicular to the axis. Alternatively, a plane passing through the first intersection and parallel to the axis may be calculated, and the position of the intersection between the plane and the annular viewing zone may be calculated as the position of the second intersection.

  In this case, the second intersection point can be easily calculated based on the exit point and the plane passing through the first intersection point and parallel to the axis and the annular viewing zone.

  (3) When a straight line passing through the first and second intersections intersects a stereoscopic image to be presented at a plurality of points, the control means determines the position of the intersection closest to the second intersection at the third intersection. You may calculate as a position.

  In this case, the color to be presented at the intersection closest to the second intersection among the plurality of intersections between the straight line passing through the first and second intersections and the stereoscopic image to be presented reaches the second intersection. Set as the color of the rays to be played. Thereby, the color of the stereoscopic image to be observed at the second intersection is accurately set to the light ray.

  (4) The reference surface may be an upper surface of the table top, the top may have an opening, and the light controller may be fitted into the opening of the top.

  In this case, a stereoscopic image is presented in the space on the table top. Thereby, it is possible to easily perform work using the same stereoscopic image by a plurality of persons surrounding the table. A lid made of a transparent material may be fitted into the opening.

  (5) The light generator may include one or more projectors. In this case, the projector can easily irradiate the outer peripheral surface of the light beam controller with a light beam group composed of a plurality of light beams.

  (6) A stereoscopic image presentation method according to a second invention is a stereoscopic image presentation method for presenting a stereoscopic image on a stereoscopic display based on stereoscopic shape data, and the stereoscopic display has a cone shape or a columnar shape. And a ray controller arranged so that the bottom of the cone or columnar shape opens on the reference plane, and a ray controller composed of a plurality of rays below the reference plane and outside the ray controller. A light generator disposed around the light controller so as to irradiate the outer peripheral surface of the light source, and the light controller transmits each light beam irradiated by the light generator without diffusing in the circumferential direction and ridgeline The stereoscopic image presenting method is configured to diffuse the light in the direction and transmit the light, and to set a color for each of the plurality of light rays to be generated by the light generator, Irradiating the outer peripheral surface of the light controller with a plurality of light beams each having a set color, and the step of setting includes a step in which each light beam generated by the light generator intersects the outer peripheral surface of the light controller. A step of obtaining a straight line passing through the position of the intersection of 1 and a second intersection where a light beam transmitted through the light controller and diffused by the light controller intersects the viewing zone representing the range of the observation position; The method includes a step of calculating a position of a third intersection where the straight line intersects with the stereoscopic image to be presented, and a step of setting the color of the stereoscopic image to be presented at the third intersection as the color of the light beam.

  In the three-dimensional display, the light controller has a cone shape or a column shape. This light control element is arranged so that the bottom of the cone shape opens on the reference plane. In addition, the light generator is disposed around the light controller so as to irradiate the outer peripheral surface of the light controller with a light group composed of a plurality of light beams below the reference surface and from the outside of the light controller.

  Note that the cone shape is not limited to a cone, an elliptical cone, or a polygonal pyramid, and includes a truncated cone, an elliptical truncated cone, or a truncated pyramid. The columnar shape includes a cylinder, an elliptical column, and a prism.

  In this case, the light beam controller transmits each light beam irradiated by the light beam generator without diffusing in the circumferential direction. Thereby, each intersection of the light from the light generator becomes a point light source. An observer virtually perceives a set of point light sources as a three-dimensional shape of an entity. At this time, the binocular parallax occurs because the gaze direction of the left eye and the gaze direction of the right eye that intersect the same point light source are different. As a result, a stereoscopic image is presented by a set of a plurality of point light sources.

  The light beam controller diffuses and transmits each light beam irradiated by the light beam generator in the ridge line direction. Thereby, the light beam reaches a common observation position from an arbitrary position in the ridge line direction of the light beam generator with a simple configuration.

  Each light beam generated by the light beam generator intersects the outer peripheral surface of the light beam controller at a first intersection, passes through the light beam controller and diffuses at the light beam controller, and enters the viewing zone representing the range of the observation position. Cross at two intersections.

  In the stereoscopic image presentation method, a straight line that passes through the first and second intersections is acquired, and the position of the third intersection that intersects the stereoscopic image to be presented is calculated. The color of the stereoscopic image at the calculated third intersection is set as the color of the light beam. A light ray group composed of a plurality of light rays each having a set color is generated by a light ray generator. Thereby, the color of each light beam is appropriately set according to the stereoscopic image to be presented. As a result, a natural and fine stereoscopic image can be presented to the observer.

  According to the present invention, the color of each light beam is appropriately set according to the stereoscopic image to be presented. As a result, a natural and fine stereoscopic image can be presented to the observer.

It is a typical sectional view of the three-dimensional display concerning a 1st embodiment of the present invention. It is a schematic plan view of the three-dimensional display of FIG. FIG. 3 is a perspective view of a light beam controller used in the three-dimensional display of FIGS. 1 and 2. FIG. 5 is a schematic plan view for explaining the operation of the scanning projector. It is a schematic plan view for demonstrating the presentation method of a stereo image. It is typical sectional drawing for demonstrating the presentation method of a stereo image. It is a schematic plan view for demonstrating the generation | occurrence | production principle of the binocular parallax in the three-dimensional display which concerns on this Embodiment. It is a typical perspective view for demonstrating the setting method of the color of each light ray radiate | emitted from a projector. It is a typical vertical sectional view for demonstrating the setting method of the color of each light ray radiate | emitted from a projector. FIG. 6 is a schematic plan view for explaining a method for setting the color of each light beam emitted from the projector. It is a figure for demonstrating a projection vector, an up vector, an angle of view, and pixel data. It is a flowchart which shows operation | movement of a control apparatus. It is typical sectional drawing of the three-dimensional display which concerns on the 2nd Embodiment of this invention. It is a typical top view of the three-dimensional display of FIG. It is a schematic plan view for demonstrating the presentation method of a stereo image. It is typical sectional drawing of the three-dimensional display which concerns on the 3rd Embodiment of this invention. FIG. 17 is a schematic plan view of the three-dimensional display in FIG. 16.

(1) 1st Embodiment (1-1) Structure of 3D display FIG. 1: is typical sectional drawing of the 3D display which concerns on the 1st Embodiment of this invention. FIG. 2 is a schematic plan view of the stereoscopic display of FIG. FIG. 3 is a perspective view of a light beam controller used in the stereoscopic display of FIGS. 1 and 2.

  As shown in FIG. 1, the stereoscopic display includes a truncated cone-shaped light beam controller 1, a plurality of projectors 2, a control device 3, and a storage device 4.

  The three-dimensional display shown in FIGS. 1 and 2 is provided on a table 5. The table 5 includes a top plate 51 and a plurality of legs 52. The top plate 51 has a circular hole.

  As shown in FIG. 3, the light beam controller 1 has a truncated cone shape that is rotationally symmetric about the axis C. The large diameter bottom portion and the small diameter bottom portion of the light beam controller 1 are open. The light beam controller 1 is formed so that an incident light beam is diffused and transmitted in the ridge line direction T and is transmitted in a straight line without being diffused in the circumferential direction R around the axis C.

  In the present embodiment, the light beam controller 1 has a truncated cone shape. However, the present invention is not limited to this, and the light beam controller 1 may have a cone shape, or a polygonal frustum shape or a polygonal pyramid shape. You may have. These shapes are called cone shapes.

  As shown in FIG. 1, the light beam controller 1 is fitted into the circular hole of the top plate 51 so that the large-diameter bottom opening faces upward. An observer 10 around the table 5 can observe the inner peripheral surface of the light beam controller 1 from obliquely above the top plate 51 of the table 5.

  Below the table 5, a plurality of projectors 2 are arranged on a circumference around the axis C of the light beam controller 1. The plurality of projectors 2 are provided so as to irradiate the outer peripheral surface of the light beam controller 1 from obliquely below the light beam controller 1. A transparent circular plate may be fitted into the circular hole portion of the table 51.

  The projector 2 emits a light beam group composed of a plurality of light beams so as to project a two-dimensional image onto the outer peripheral surface of the light beam controller 1. As the projector 2, for example, a scanning projector is used. The scanning projector emits a light beam composed of a plurality of light beams by emitting a light beam composed of laser light and deflecting the light beam in a horizontal plane and a vertical plane. As the projector 2, a projector including a spatial light modulator and a projection lens such as an LCD (Liquid Crystal Display), DMD (Digital Mirror Device), or LCOS (Liquid Crystal on Silicon) may be used.

  The storage device 4 includes, for example, a hard disk, a memory card, and the like. The storage device 4 stores stereoscopic shape data for presenting the stereoscopic image 100. The control device 3 is composed of a personal computer, for example. The control device 3 controls the plurality of projectors 2 based on the solid shape data stored in the storage device 4. Thereby, the stereoscopic image 300 is presented above the light controller 1.

(1-2) Operation of Projector 2 FIG. 4 is a schematic plan view for explaining the operation of the projector 2. Only one projector 2 is shown in FIG.

  As described above, each projector 2 emits a light beam group so as to project a two-dimensional image on the outer peripheral surface of the light beam controller 1. In this case, each light ray of the light ray group corresponds to each pixel of the projected image. The color of each light ray (the color of each pixel) is set according to the stereoscopic image 300 to be presented. A specific method for setting the color of each light beam will be described later.

  When a scanning projector is used as the projector 2, the color of the light beam is set for each light emission direction. As a result, a light beam group similar to the above can be formed in a pseudo manner.

  In FIG. 4, the projector 2 irradiates the light controller 1 with a plurality of light beams L1 to L11. The light beams L1 to L11 are set to arbitrary colors, respectively. Thereby, the light rays L1 to L11 of the set colors are transmitted through the plurality of positions P1 to P11 of the light ray controller 1 respectively.

  Since the light beam controller 1 transmits the light beams L1 to L11 linearly without diffusing in the circumferential direction, the observer can view only one light beam at a certain position. Moreover, since the light beam controller 1 diffuses and transmits the light beams L1 to L11 in the vertical direction, the observer can visually recognize one light beam from an arbitrary position in the vertical direction.

(1-3) Presentation Method of Stereoscopic Image 300 FIG. 5 is a schematic plan view for explaining the presentation method of the stereoscopic image 300. In FIG. 5, three projectors 2A, 2B, and 2C are shown.

  For example, when a red pixel is presented at a position PR above the light beam controller 1, a red light beam LA0 is emitted from the projector 2A in the direction passing the position PR, and the red light beam LA0 is emitted from the projector 2B in the direction passing the position PR. A light beam LB0 is emitted, and a red light beam LC0 is emitted from the projector 2C in a direction passing through the position PR. Thereby, a red pixel serving as a point light source is presented at the intersection of the red light beams LA0, LB0, and LC0. In this case, a red pixel can be seen at the position PR when the observer's eye is at the position IA0, at the position IB0, and at the position IC0.

  Similarly, when a green pixel is presented at a position PG above the light beam controller 1, a green light beam LA1 is emitted from the projector 2A in a direction passing through the position PG, and from the projector 2B in a direction passing through the position PG. A green light beam LB1 is emitted, and a green light beam LC1 is emitted from the projector 2C in a direction passing through the position PG.

  Thereby, a green pixel serving as a point light source is presented at the intersection of the green light beams LA1, LB1, and LC1. In this case, a green pixel is seen at the position PG when the observer's eyes are at the position IA1, the position IB1, and the position IC1.

  In this way, light beams of colors to be presented are emitted from each of the plurality of projectors 2A, 2B, 2C in the direction passing through each position of the stereoscopic image 300.

  A plurality of projectors including the projectors 2A, 2B, and 2C are closely arranged on the circumference, and the space inside the light controller 1 is sufficiently densely intersected by a group of light beams emitted from the plurality of projectors. If any of the directions on the circumference is observed, an appropriate ray passing through the positions PR and PG will be incident on the eye, and the human eye will be there. Recognize that there is a point light source. Since the person recognizes the illumination light reflected or diffused on the surface of the real object as an object, the surface of the object can be regarded as a set of point light sources. That is, the three-dimensional image 300 can be presented by appropriately reproducing the color of a certain position PR, PG that is desired to be the surface of the object by the light rays coming from the plurality of projectors 2A, 2B, 2C.

  In this way, the stereoscopic image 300 can be presented in the space inside and above the light beam controller 1. In this case, the observer can visually recognize the same stereoscopic image 300 from different directions at different positions in the circumferential direction.

  FIG. 6 is a schematic cross-sectional view for explaining a method for presenting the stereoscopic image 300. In FIG. 6, one projector 2 is shown.

  As shown in FIG. 6, the light beam emitted from the projector 2 is diffused in the vertical direction by the light beam controller 1 at the diffusion angle α. As a result, the observer can see the same color rays emitted from the projector 2 at different positions in the vertical direction within the range of the diffusion angle α. For example, even when the observer moves the line of sight from the reference position E to the upper position E ′, the same portion of the stereoscopic image 300 can be seen. In this case, the position of the stereoscopic image 300 visually recognized by the observer moves depending on the position of the observer's eyes in the vertical direction. Thus, since the light emitted from the projector 2 is diffused in the vertical direction by the light controller 1, the stereoscopic image 300 can be observed even if the observer moves the line of sight up and down.

  The color of each light beam of the light beam group emitted by the plurality of projectors 2 in FIG. 1 is set by the control device 3 based on the solid shape data stored in the storage device 4. A specific method for setting the color of each light beam will be described later.

  The control device 3 controls the plurality of projectors 2 based on the color of each light beam in the set light beam group. Thereby, a group of light beams each having a set color is emitted from each projector 2 so that the stereoscopic image 300 is presented above the light beam controller 1.

  As described above, according to the stereoscopic display according to the present embodiment, the directional display of the stereoscopic image 300 is possible.

(1-4) Principle of Binocular Parallax Generation Here, the principle of binocular parallax generation in the stereoscopic display according to the present embodiment will be described.

  FIG. 7 is a schematic plan view for explaining the principle of generation of binocular parallax in the stereoscopic display according to the present embodiment. FIG. 7 shows four projectors 2a, 2b, 2c, and 2d.

  In FIG. 7, when the observer views the point P31 of the light controller 1, the light beam La emitted from the projector 2a enters the right eye 100R, and the light beam Lb emitted from the projector 2b enters the left eye 100L. Incident. When the observer sees the point P32 of the light beam controller 1, the light beam Lc emitted from the projector 2c is incident on the right eye 100R, and the light beam Ld emitted from the projector 2d is incident on the left eye 100L. .

  Here, the color of the light beam La and the color of the light beam Ld are the same, the color of the light beam Lb is different from the color of the light beam La, and the color of the light beam Lc is different from the color of the light beam Ld. In this case, the color of the point P31 on the light beam controller 1 differs depending on the viewing direction. Further, the color of the point P32 on the light beam controller 1 also varies depending on the viewing direction.

  A point Pa of the stereoscopic image 300 is created by the light ray La, a point Pb of the stereoscopic image 300 is created by the light ray Lb, a point Pc of the stereoscopic image 300 is created by the light ray Lc, and a point Pd of the stereoscopic image 300 is created by the light ray Ld. It is done.

  In the example of FIG. 7, the point Pa and the point Pd of the stereoscopic image 300 are at the same position. That is, the points Pa and Pd of the stereoscopic image 300 are created at the intersections of the light beam La and the light beam Ld. The points Pa and Pd can be virtual point light sources. In this case, the direction of viewing the points Pa and Pd with the right eye 100R is different from the direction of viewing the points Pa and Pd with the left eye 100L. That is, there is a convergence angle between the line-of-sight direction of the right eye 100R and the line-of-sight direction of the left eye 100L. Thereby, the stereoscopic view of the image formed by the light beam group becomes possible.

(1-5) Method for Setting Color of Light Ray FIGS. 8 to 10 are a schematic perspective view, a schematic vertical sectional view, and a schematic plane for explaining a method for setting the color of each light beam emitted from the projector 2. FIG. Here, a method for setting the color of an arbitrary light beam Ln emitted from one projector 2 will be described. 8 to 10, a three-dimensional image 300 of a building is shown.

  In the following description, the coordinates mean coordinates in a predefined world coordinate system. For example, two axes orthogonal to each other on the horizontal plane are defined as an X axis and a Z axis in the world coordinate system, and an axis along the vertical direction is defined as a Y axis in the world coordinate system.

  When a plurality of observers 10 (FIG. 1) are seated around the table 5 (FIG. 1), the eyes of the plurality of observers 10 are at a substantially constant distance from the axis C of the light controller 1. And a position at a substantially constant height (reference position). Therefore, an annular area where the eyes of a plurality of observers 10 are located is set as an annular viewing area 500.

  8 to 10, a light beam Ln is emitted from the emission point 20 of the projector 2. When the projector 2 having a projection lens is used, the optical center of the projection lens corresponds to the emission point 20. The exit points 20 of the plurality of projectors 2 are respectively located on an annular ring centered on the axis C of the light beam controller 1 and parallel to the horizontal plane.

  The light beam Ln intersects the optical controller 1 at the intersection CP1 and diffuses in the vertical plane. That is, the light beam Ln expands in a fan shape within the vertical plane Fn (FIG. 10) passing through the emission point 20 and the intersection point CP1. A part of the diffused light intersects the annular viewing zone 500 at the intersection CP2. In this case, the light ray Ln can be observed at the intersection CP2.

  In this example, among the intersections of the straight line L passing through the intersection points CP1 and CP2 and the stereoscopic image 300 to be presented, the light ray Ln presents the color from the intersection point CP3 closest to the intersection point CP2 toward the intersection point CP2. The color of Ln is set.

  Here, a virtual projection plane Fp on which an image is projected by the projector 2 is considered. The projection surface Fp is a plane perpendicular to the optical axis of the projector 2, for example. The optical axis of the projector 2 refers to the axis of light emitted to the center of the scanning range of the projector 2. The coordinates of each pixel of the image formed on the projection plane Fp can be uniquely determined based on the coordinates of the emission point 20 of the projector 2 and the following projection vector, up vector, angle of view, and pixel data. The pixel coordinates are coordinates that uniquely indicate the position of the pixel, for example, the coordinates of the center point of the pixel. Hereinafter, each pixel of the image formed on the projection plane Fp is simply referred to as each pixel on the projection plane Fp.

  FIG. 11 is a diagram for explaining the projection vector, the up vector, the angle of view, and the pixel data. FIG. 11A shows a schematic side view of the projector 2, and FIG. 11B shows a schematic plane of the projector 2. As shown in FIGS. 11A and 11B, the four directions perpendicular to the optical axis OL of the projector 2 are defined as the upward direction, the downward direction, the left direction, and the right direction of the projector 2, respectively. The upward and downward directions are opposite to each other, and the left and right directions are opposite to each other. Further, the upward direction and the downward direction are perpendicular to the left direction and the right direction, respectively. The optical axes OL of the plurality of projectors 2 intersect with each other at one point on the axis C of the light beam controller 1. The upward direction, the downward direction, the left direction, and the right direction of the projector 2 are defined so as to correspond to the top, bottom, left, and right of the image projected on the projection plane Fp of FIGS.

  The projection vector vp indicates the light emission direction on the optical axis OL of the projector 2. The up vector vu indicates the upward direction of the projector 2.

  The angle of view is the angle of spread of the ray group emitted from the emission point 20, and the angle of spread of the ray group in the vertical direction of the projector 2 (hereinafter referred to as the vertical angle of view) θ1 and the ray of light in the left-right direction of the projector 2. The angle of group spread (hereinafter referred to as a horizontal angle of view) θ2 is included. The pixel data includes the number of pixels in the vertical direction of the projector 2 (hereinafter referred to as the number of vertical pixels) and the number of pixels in the horizontal direction of the projector 2 (hereinafter referred to as the number of horizontal pixels).

  Here, the coordinates of the emission point 20 are the position of the projector 2. The attitude of the projector 2 can be expressed by the projection vector vp and the up vector vu. Based on the coordinates of the emission point 20, the projection vector vp, and the up vector vu, the position of the projection plane Fp of the corresponding projector 2 can be obtained.

  Further, the vertical size of the projection plane Fp can be obtained based on the vertical angle of view θ1, and the horizontal size of the projection plane Fp can be obtained based on the horizontal angle of view θ2. Furthermore, it is possible to obtain pixel intervals in the vertical direction and the horizontal direction of the projection plane Fp based on the pixel data. That is, the value obtained by dividing the vertical size of the projection plane Fp by the number of vertical pixels is the pixel spacing in the vertical direction, and the value obtained by dividing the horizontal size of the projection plane Fp by the number of horizontal pixels is the pixel spacing in the horizontal direction. It becomes. Thereby, the coordinates of each pixel on the projection plane Fp can be obtained.

  When the projection plane Fp is considered as a two-dimensional coordinate plane, the coordinates of each pixel on the projection plane Fp can be represented by two-dimensional coordinates. The two-dimensional coordinates may be converted into three-dimensional coordinates in the world coordinate system.

  The position of each pixel on the projection plane Fp coincides with the position of the intersection of each light ray emitted from the emission point 20 and the projection plane Fp. Therefore, a vector indicating the direction of each ray can be obtained based on the coordinates of the emission point 20 and the coordinates of each pixel on the projection plane Fp.

  8 to 10, the coordinate of the emission point 20 is Pp, and the coordinate of the pixel Tn corresponding to the light ray Ln is Pi. In this case, the direction vector vs indicating the direction of the light ray Ln is represented by {v (Pi) −v (Pp)} using the position vector v (Pp) of the coordinate Pp and the position vector v (Pi) of the coordinate Pi. Is done.

  When the position and shape of the light beam controller 1 are known, the coordinates Ps of the intersection point CP1 between the light beam Ln and the light beam controller 1 can be obtained based on the coordinates Pp of the emission point 20 and the direction vector vs. Further, based on the coordinates Pp of the emission point 20 and the coordinates Ps of the intersection point CP1, the vertical plane Fn (FIG. 10) passing through the emission point 20 and the intersection point CP1 can be obtained.

  The intersection of the vertical plane Fn (FIG. 10) and the annular viewing zone 500 corresponds to the intersection CP2 of the diffused light of the light ray Ln and the annular viewing zone 500. Thereby, the coordinate Pe of the intersection CP2 can be obtained based on the obtained vertical plane Fn and the preset height and radius of the annular viewing zone 500.

  A light beam vector ve of the diffused light beam Ln that can be observed at the intersection CP2 is obtained by using the position vector v (Ps) at the coordinate Ps and the position vector v (Pe) at the coordinate Pe {v (Pe) −v ( Ps)}. Therefore, the straight line L passing through the intersection points CP1 and CP2 is represented by {v (Ps) + tve}. Here, t is a scalar and is an arbitrary real number.

  Based on the solid shape data stored in the storage device 4 and the obtained straight line L, the coordinates Pa of the intersection point CP3 closest to the intersection point CP2 among the intersection points between the stereoscopic image 300 to be presented and the straight line L can be obtained. it can. Further, based on the three-dimensional shape data and the obtained coordinates Pa and Pe, a color to be presented from the intersection point CP3 to the intersection point CP2 (in the direction of the vector Ve) by a 3DCG (three-dimensional computer graphics) rendering algorithm. Can be calculated. In this case, a rendering algorithm such as flat shading, Gouraud shading, phone shading, ray tracing, radiosity, or photon mapping can be used.

  The color calculated by the above algorithm is set to the color of the light ray Ln (the color of the pixel Tn). In this way, the color of the light ray Ln can be set by tracing the light ray Ln backward from the intersection point CP2.

(1-6) Operation | movement of a control part The control apparatus 3 calculates the color of the light ray irradiated from each projector 2 according to the method shown in FIGS. FIG. 12 is a flowchart showing the operation of the control device 3.

  In this example, the coordinates of the projection center 20 of all the projectors 2, the projection vector, the up vector, the angle of view and the pixel data, the position and shape of the ray controller 1, and the height and radius of the annular viewing zone 500 are shown. Is stored in the storage device 4 in advance. In the following description, the coordinates, projection vector, up vector, angle of view, and pixel data of the projection center 20 of the projector 2 are referred to as projector information, the position and shape of the light ray controller 1 are referred to as controller information, and the annular viewing zone. The height and radius of 500 is called viewing zone information.

  As shown in FIG. 12, the control device 3 first selects one projector 2 (step S1). Next, the control device 3 acquires the projector information of the selected projector 2 from the storage device 4 (step S2). Next, the control device 3 selects one pixel Tn on the projection plane Fp of the selected projector 2 (step S3). Next, the control device 3 calculates the coordinates Pi of the selected pixel Tn based on the acquired projector information (step S4).

  Next, the control device 3 calculates a vector vs indicating the direction of the light ray Ln corresponding to the pixel Tn based on the calculated coordinates Pi (step S5). Next, the control device 3 acquires the control element information from the storage device 4, and calculates the coordinate Ps of the intersection CP1 between the light beam Ln and the light beam controller 1 based on the acquired control element information and the calculated vector vs. (Step S6).

  Next, the control device 3 calculates the vertical plane Fn passing through the emission point 20 and the intersection point CP1 based on the coordinates Pp of the emission point 20 included in the acquired projector information and the calculated coordinates Ps (step S7). Next, the control device 3 acquires viewing zone information from the storage device 4, and based on the acquired viewing zone information and the calculated vertical plane Fn, the coordinates Pe of the intersection CP2 between the vertical plane Fn and the annular viewing zone 500 are obtained. Is calculated (step S8).

  Next, the control device 3 calculates a straight line L passing through the intersection points CP1 and CP2 based on the calculated coordinates Ps and Pe (step S9). Next, the control device 3 acquires the three-dimensional shape data from the storage device 4, and based on the acquired three-dimensional shape data and the calculated straight line L, the intersection CP2 among the intersection points of the three-dimensional image 300 to be presented and the straight line L. The coordinate Pa of the intersection CP3 closest to is calculated (step S10).

  Next, the control device 3 calculates a color to be presented from the intersection point CP3 to the intersection point CP2 by a 3DCG rendering algorithm based on the acquired solid shape data and the calculated coordinates Pa and Pe (step S11). The calculated color is set as the color of the light ray Ln (the color of the pixel Tn).

  Next, the control unit 3 determines whether or not the color of all light rays (the color of all pixels) has been calculated for the projector 2 selected in step S1 (step S12). When the colors of all the light rays have not been calculated, the control unit 3 returns to the process of step S3, and selects another pixel Tn adjacent to the pixel selected in the previous step S3 on the projection plane Fp. In this case, the control unit 3 repeats the processes of steps S3 to S11 for the other selected pixel Tn, and calculates the color of the light beam.

  When the colors of all the light rays are calculated in step S12, the control unit 3 generates image data based on the calculated colors and gives the image data to the projector 2 selected in step S1 (step S13). ). The projector 2 emits light beam groups having colors calculated by the control device 3 based on the given image data, and projects an image corresponding to the image data onto the light beam controller 1.

  Next, the control unit 3 determines whether image data of all the projectors 2 has been generated (step S14). When the image data corresponding to all the projectors 2 has not been generated, the control unit 3 returns to the process of step S1. In this case, the control unit 3 selects the next projector 2 and repeats the processes of steps S1 to S13.

  In step S14, when the image data of all the projectors 2 is generated, the control unit 3 ends the process.

  In the example of FIG. 12, when setting the color of each light beam, the straight line L corresponding to each light beam is calculated based on the projector information and the viewing area information. May be calculated in advance and stored in the storage device 4.

  In this case, the color of each light beam is set based on the straight line L and the solid shape data stored in the storage device 4.

(1-7) Effects of First Embodiment In the stereoscopic display according to the present embodiment, the coordinates of the intersection point between each light beam emitted from each projector 2 and the annular viewing area 500 are calculated and calculated. The color is set for each ray by tracing each ray backward from the intersection. Thereby, it is possible to appropriately set the color for each light beam in accordance with the stereoscopic image to be presented. As a result, a natural and fine stereoscopic image can be presented to the observer 10.

(2) Second Embodiment A difference between the stereoscopic display according to the second embodiment of the present invention and the first embodiment will be described.

(2-1) Configuration of 3D Display FIG. 13 is a schematic cross-sectional view of the 3D display according to the first embodiment of the present invention. FIG. 14 is a schematic plan view of the stereoscopic display of FIG.

  As shown in FIG. 13, the stereoscopic display includes a truncated cone-shaped light beam controller 1, a plurality of projectors 2, a control device 3, a storage device 4, and a rotation module 6.

  In the three-dimensional display shown in FIGS. 13 and 14, a rotation module 6 is provided below the table 5. The rotation module 6 includes a motor 61, a rotation shaft 62, a turntable 63, a signal transmission device 64, and a rotation amount measuring device 65. The rotary shaft 62 extends in the vertical direction and is attached to the motor 61 so as to be positioned on a straight line common to the axis C of the light beam controller 1. A rotating table 63 is attached to the rotating shaft 62 in a horizontal posture. A signal transmission device 64 is provided between the rotary shaft 62 and the rotary base 63. The signal transmission device 64 is a device for transmitting electric power or a signal between a stationary body and a rotating body. As the signal transmission device 64, for example, a slip ring or an optical rotary joint can be used.

  In addition, a rotation amount measuring device 65 is provided on the rotation shaft 62. The rotation amount measuring device 65 is used to detect the rotation position of the rotation shaft 62. As the rotation amount measuring device 65, for example, a rotary encoder or the like can be used. The motor 61 is controlled by the control device 3.

  A plurality of projectors 2 are fixed on the turntable 63. In the present embodiment, the plurality of projectors 2 are arranged at equiangular intervals on a circumference centered on the axis C of the light beam controller 1. The plurality of projectors 2 do not necessarily have to be arranged at equiangular intervals. However, in order to stabilize the rotation of the plurality of projectors 2 and to facilitate the control of the plurality of projectors 2, it is preferable that the plurality of projectors 2 are arranged at equiangular intervals as in the present embodiment. . The plurality of projectors 2 are provided so as to irradiate a light beam group on the outer peripheral surface of the light beam controller 1 from obliquely below the light beam controller 1.

  The plurality of projectors 2 and the rotation amount measuring device 65 on the turntable 63 are connected to the control device 3 via the signal transmission device 64.

  When the motor 61 is operated, the rotary shaft 62 rotates together with the rotary base 63 and the plurality of projectors 2.

  The rotation speed of the turntable 63 is preferably 5 rotations or more per second when the number of projectors 2 is six as in the example of FIG. 14, and is 1 when the number of projectors 2 is two. It is preferably 15 revolutions or more per second, preferably 10 revolutions or more per second when the number of projectors 2 is 3, and 7.7 per second when the number of projectors 2 is 4. It is preferable that the number of rotations is 5 or more. When the number of the projectors 2 is one, it is preferable that the rotation speed of the turntable 63 is 30 rotations or more per second. That is, when the number of projectors 2 is n (n is a natural number), the rotation speed of the turntable 63 is preferably 30 / n rotations or more per second.

  As in the first embodiment, a transparent circular plate may be fitted into the circular hole portion of the table 51.

(2-2) Presentation Method of Stereoscopic Image 300 FIG. 15 is a schematic plan view for explaining the presentation method of the stereoscopic image 300. In FIG. 15, one projector 2 is shown.

  The projector 2 moves in the direction of the arrow. For example, when a red pixel is presented at a position PR above the light beam controller 1, a red light beam LR0 is emitted from the projector 2 in a direction passing through the position PR at time t, and the position PR from the projector 2 at time t + 1. A red light beam LR1 is emitted in a direction passing through, and a red light beam LR2 is emitted from the projector 2 in a direction passing through the position PR at time t + 2.

  Thereby, a red pixel serving as a point light source is presented at the intersection of the red light beams LR0, LR1, and LR2. In this case, a red pixel can be seen at the position PR when the observer's eye is at the position IR0, at the position IR1, and at the position IR2.

  Similarly, when a green pixel is presented at a position PG above the light beam controller 1, a green light beam LG0 is emitted from the projector 2 in the direction passing the position PG at time t, and from the projector 2 at time t + 1. Green light beam LG1 is emitted in the direction passing through position PG, and green light beam LG2 is emitted from projector 2 in the direction passing through position PG at time t + 2.

  Thereby, a green pixel serving as a point light source is presented at the intersection of the green light beams LG0, LG1, and LG2. In this case, when the observer's eye is at the position IG0, when the observer's eye is at the position IG1, and when at the position IG2, a green pixel is seen at the position PG.

  In this way, light beams of colors to be presented in the directions passing through the positions of the stereoscopic image 300 are emitted from different positions by the projectors 2.

  By controlling the light ray group emitted from each rotating projector 2 at small angular intervals, the space inside the light ray controller 1 is sufficiently densely filled with the intersection point group. As a result, even if the inside of the light beam controller 1 is observed from any direction on the circumference, an appropriate light beam that passes through the positions PR and PG enters the eye, and the human eye has a point light source there. Recognize as there is. Since the person recognizes the illumination light reflected or diffused on the surface of the real object as an object, the surface of the object can be regarded as a set of point light sources. That is, the three-dimensional image 300 can be presented by appropriately reproducing the color of a certain position PR, PG desired as the surface of the object by the light beam emitted from each projector 2 that rotates.

  In this way, the stereoscopic image 300 can be presented in the space inside and above the light beam controller 1. In this case, the observer can visually recognize the same stereoscopic image 300 from different directions at different positions in the circumferential direction.

  Also in the stereoscopic display according to the present embodiment, as shown in FIG. 6, the light emitted from the projector 2 is diffused in the vertical direction by the light controller 1 at the diffusion angle α. As a result, the observer can see the same color rays emitted from the projector 2 at different positions in the vertical direction within the range of the diffusion angle α.

  The color of each light beam of the light beam group emitted from each projector 2 in FIG. 13 is calculated by the control device 3 according to the method shown in FIGS. 8 to 10 for each rotational position of each projector 2. Here, the rotation position of the projector 2 refers to the rotation angle of the projector 2 from the reference radial direction around the axis C.

  The control device 3 determines the rotation position of each projector 2 based on the output signal of the rotation amount measuring device 65, and controls each projector 2 based on the color of each light beam of the light beam group calculated for each rotation position. Accordingly, light beams having colors calculated from the projectors 2 are emitted so that the stereoscopic image 300 is presented above the light beam controller 1.

  In this case, the control device 3 calculates the color of each light beam to be emitted from each projector 2 based on the three-dimensional shape data in advance as color data for each rotation position, and stores the calculated color data in the storage device 4. Also good. Then, when presenting the stereoscopic image 300, the color data may be read from the storage device 4 in synchronization with the output signal of the rotation amount measuring device 65, and each projector 2 may be controlled based on the read color data. Alternatively, the control device 3 calculates, as color data, the color of each light beam to be emitted from each projector 2 based on the solid shape data in synchronization with the output signal of the rotation amount measuring device 65 during the rotation of the projector 2. Each projector 2 may be controlled based on the calculated color data.

  As described above, according to the stereoscopic display according to the present embodiment, the directional display of the stereoscopic image 300 is possible.

  Also in the stereoscopic display according to the present embodiment, binocular parallax occurs on the generation principle using FIG.

(2-4) Effect of Second Embodiment Also in the stereoscopic display according to the present embodiment, the coordinates of the intersection point between each light beam emitted from each projector 2 and the annular viewing area 500 are calculated and calculated. The color is set for each ray by tracing each ray backward from the intersection. Thereby, it is possible to appropriately set the color for each light beam in accordance with the stereoscopic image to be presented. As a result, a natural and fine stereoscopic image can be presented to the observer 10.

  Further, when each projector 2 rotates, the light beam controller 1 can be irradiated with a light beam group from a plurality of rotation positions. As a result, a continuous stereoscopic image 300 having no discontinuity in the circumferential direction can be presented above the light controller 1 using a small number of projectors 2.

(3) Third Embodiment A three-dimensional display according to the third embodiment of the present invention will be described with respect to differences from the second embodiment.

(3-1) Configuration of 3D Display FIG. 16 is a schematic cross-sectional view of a 3D display according to the second embodiment of the present invention. FIG. 17 is a schematic plan view of the stereoscopic display of FIG.

  16 and 17 further include a plurality of mirrors 7 in addition to the light beam controller 1, the plurality of projectors 2, the control device 3, the storage device 4, and the rotation module 6.

  The plurality of mirrors 7 are provided corresponding to the plurality of projectors 2. The plurality of projectors 2 are arranged at equiangular intervals on a circumference centering on the axis C in the vicinity of the rotation shaft 62 on the turntable 63. The plurality of projectors 2 are provided so as to emit a light beam group outward and obliquely upward.

  The plurality of mirrors 7 are provided on the turntable 63 so as to reflect a group of light beams emitted from the plurality of projectors 2 and irradiate the outer peripheral surface of the light beam controller 1 from obliquely below the light beam controller 1. In the example of FIG. 17, the plurality of mirrors 7 are arranged on the turntable 63 in a regular polygon shape.

  When the motor 61 is operated, the rotary shaft 62 rotates together with the rotary base 63, the plurality of projectors 2, and the mirror 7. In this case, the light beam group emitted from each rotating projector 2 is reflected by the corresponding mirror 7 and applied to the outer peripheral surface of the light beam controller 1.

(3-2) Effects of Third Embodiment Also in the stereoscopic display according to the present embodiment, the coordinates of the intersection point between each light ray emitted from each projector 2 and the annular viewing area 500 are calculated and calculated. The color is set for each ray by tracing each ray backward from the intersection. Thereby, it is possible to appropriately set the color for each light beam in accordance with the stereoscopic image to be presented. As a result, a natural and fine stereoscopic image can be presented to the observer 10.

  In addition, since the plurality of projectors 2 are provided at positions closer to the rotation shaft 62, the radius of the turntable 63 can be reduced. Thereby, the plurality of projectors 2 can be rotated at high speed. As a result, the stereoscopic image 300 with higher resolution can be presented using a small number of projectors 2.

(4) Other Embodiments (a) In the first to third embodiments described above, the light beam controller 1 is fixed to the top plate 51 of the table 5, but a rotary drive device such as a motor is used. Thus, the light beam controller 1 may be rotated around the axis C. For example, when the light controller 1 is made of an N cone (N is an integer of 3 or more) or is manufactured by bonding a plurality of sheets, the optical performance at the joint of the light controller 1 is disturbed. Arise. In such a case, the optical performance disturbance at the joint is averaged by rotating the light beam controller 1 around the axis C. As a result, unevenness in the image quality of the presented stereoscopic image 300 is prevented.

  (B) The light beam controller 1 may have a columnar shape including a cylinder, an elliptical column, or an N prism (N is an integer of 3 or more). Also in this case, the light controller 1 transmits the light while diffusing the light in the vertical direction. Thereby, the stereoscopic image can be presented so as to be positioned in a space on a reference surface such as the upper surface of the top plate 51 of the table 5 or in a space inside the light beam controller 1.

  (C) In the second and third embodiments described above, the plurality of projectors 2 are provided on the turntable 63 at equal angular intervals, but even if one projector 2 is provided on the turntable 63. Good. Also in this case, the rotating shaft 62 is rotated at a high speed together with the turntable 63 and the projector 2 by the motor 61, and as in the case where a plurality of projectors 2 are used, there is no continuous portion in the circumferential direction. The stereoscopic image 300 can be presented.

  (D) In the second and third embodiments described above, the rotation amount measuring device 65 is provided to detect the rotation position of each projector 2, but the turntable 63 rotates accurately at a constant rotation speed. In this case, the rotation amount measuring device 65 may not be provided. In this case, the control device 3 can recognize the rotation position of each projector 2 based on the rotation speed of the turntable 63.

  (E) In the third embodiment, the plurality of mirrors 7 are arranged in a polygonal shape on the turntable 63, but cylindrical mirrors may be used. In this case, the cylindrical mirror may be fixed on the turntable 63 and rotated together with the turntable 63. Alternatively, the cylindrical mirror is provided separately from the turntable 63 and may not rotate.

  (F) In the first to third embodiments, the annular viewing area 500 is set in advance as the position of the eyes of the observer 10, and the color of each light ray is calculated according to the annular viewing area 500. However, the present invention is not limited thereto, and a detection device such as a camera or a sensor for detecting the eye position of the observer 10 may be provided, and the color of each light beam may be calculated according to the detected eye position. . In this case, the stereoscopic image 300 can be appropriately presented to the observer 10 even if the position of the eyes of the observer 10 changes.

  (G) In the first to third embodiments described above, the color of each light beam is calculated based on the solid shape data stored in advance in the storage device 4, but this is not restrictive, and the real object is obtained by the camera. May be photographed, and the color of each light ray may be calculated based on the photographed data (image data). In this case, a stereoscopic image 300 of the photographed object is presented.

  (H) In the first to third embodiments described above, the color of each light beam is set according to the method shown in FIGS. 8 to 10. The brightness may be further set.

(8) Correspondence between each constituent element of claim and each element of the embodiment Hereinafter, an example of correspondence between each constituent element of the claim and each element of the embodiment will be described. It is not limited to.

  In the above embodiment, the light beam controller 1 is an example of a light beam controller, the projector 2 is an example of a light beam generator, the control device 3 is an example of control means, and the top surface of the top plate 51 of the table 5 is It is an example of a reference plane. The intersection point CP1 is an example of the first intersection point, the intersection point CP2 is an example of the second intersection point, the intersection point CP3 is an example of the third intersection point, and the annular viewing zone 500 is an example of the viewing zone. The straight line L is an example of a straight line, and the vertical plane Fn is an example of a plane passing through the emission point and the first intersection and parallel to the axis.

  As each constituent element in the claims, various other elements having configurations or functions described in the claims can be used.

  The present invention can be used for collaborative work using stereoscopic images. In addition, it can be used for a study work in which a plurality of people proceed while sharing one stereoscopic image as in a city design scene. Furthermore, it can be used when information of a three-dimensional shape is shared in addition to information such as a document spread on a table during a video conference between remote locations.

  Further, it can be used when a teacher explains a part of a stereoscopic image while pointing at an educational scene or the like. In addition, since the light controller is below the work surface such as a table and the three-dimensional image is presented in the space on the work surface, it directly refers to the three-dimensional image rather than the sense of pointing the three-dimensional image from the outside of the glass case. It can be used to get a sense.

  It can be used for games using table-type stereoscopic images. Moreover, since glasses are not required, it can be used in a place where the audience can freely participate or leave. By using a large arena-shaped device, it can be used to create a theater space that can be viewed from the surroundings.

DESCRIPTION OF SYMBOLS 1 Light beam controller 2, 2A, 2B, 2C, 2a, 2b, 2c, 2d Projector 3 Control apparatus 4 Memory | storage device 5 Table 20 Projection center point 51 Top plate 52 Leg 6 Rotation module 61 Motor 62 Rotation shaft 63 Rotation base 64 Slip Ring 65 Rotary encoder 7 Mirror 10 Observer 100, 300 Stereo image 100R Right eye 100L Left eye 500 Annular viewing zone CP1, CP2, CP3 Intersection point Fn Vertical plane Fp Projection plane IA0, IB0, IC0, PR, PG, E, E ', I1-I4, P1-P3, PS, IG0-IG2, IR0-IR2 positions L1-L11, La, Lb, Lc, Ld, Ln, LA0, LB0, LC0, LA1, LB1, LC1, L31-L33, LG0 to LG2, LR0 to LR2 Light OL Optical axis P31, P32, Pa, Pb, Pc, d point

Claims (6)

A stereoscopic display for presenting a stereoscopic image based on stereoscopic shape data,
A light beam controller having a cone shape or a columnar shape and arranged so that a bottom portion of the cone shape or the columnar shape opens on a reference plane;
A light generator disposed around the light controller so as to irradiate the outer peripheral surface of the light controller with a light group consisting of a plurality of light rays below the reference surface and from the outside of the light controller;
Control means for controlling the light generator so that a stereoscopic image is presented by a group of light beams generated by the plurality of light generators based on the three-dimensional shape data;
The light beam controller is formed to transmit each light beam irradiated by the light beam generator without diffusing in the circumferential direction and to diffuse and transmit in the ridge line direction,
The control means observes a first intersection where each light beam generated by the light beam generator intersects the outer peripheral surface of the light beam controller, and a light beam transmitted through the light beam controller and diffused by the light beam controller. Obtaining a straight line passing through a second intersection that intersects the viewing zone representing the range of the position, calculating a position of a third intersection where the obtained straight line intersects the stereoscopic image to be presented, and The color of the stereoscopic image to be presented at an intersection is set as the color of the light beam, and the light generator is controlled so as to generate a light beam group composed of a plurality of light beams each having a set color. 3D display. Each of the light generators has an exit point for emitting the light beam group,
The viewing zone is an annular viewing zone centered on and perpendicular to the axis of the light controller,
The control means calculates a plane that passes through the emission point and the first intersection and is parallel to the axis, and calculates the position of the intersection between the plane and the annular viewing zone as the position of the second intersection. The three-dimensional display according to claim 1, wherein: When the straight line passing through the first and second intersections intersects the stereoscopic image to be presented at a plurality of points, the control means determines the position of the intersection closest to the second intersection. 3. The three-dimensional display according to claim 1, wherein the three-dimensional display is calculated as the position of the intersection. The reference surface is an upper surface of a top plate of a table, the top plate has an opening, and the light controller is fitted into the opening of the top plate. The three-dimensional display according to any one of 3 above. The three-dimensional display according to claim 1, wherein the light generator includes one or more projectors. A stereoscopic image presentation method for presenting a stereoscopic image on a stereoscopic display based on stereoscopic shape data,
The three-dimensional display has a cone shape or a columnar shape, and a light beam controller arranged so that a bottom of the cone shape or the columnar shape opens on a reference plane; a lower side of the reference plane; and A light generator disposed around the light controller so as to irradiate the outer peripheral surface of the light controller with a light group consisting of a plurality of light beams from the outside of the light controller;
The light beam controller is formed to transmit each light beam irradiated by the light beam generator without diffusing in the circumferential direction and to diffuse and transmit in the ridge line direction,
The stereoscopic image presentation method includes:
Setting a color for each of a plurality of rays to be generated by the ray generator;
Irradiating a plurality of light beams each having a color set on the outer peripheral surface of the light beam controller from the light beam generator,
The setting step includes:
The position of the first intersection where each light beam generated by the light beam generator intersects the outer peripheral surface of the light beam controller, and the range of the observation position where the light beam transmitted through the light beam controller and diffused by the light beam controller Obtaining a straight line passing through a second intersection that intersects the viewing zone representing
Calculating a position of a third intersection where the calculated straight line intersects a stereoscopic image to be presented;
And a step of setting a color of the stereoscopic image to be presented as the color of the light beam at the third intersection.

Images