JP2008107537A - Video display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display system that can reduce viewers' uncomfortable feeling even if viewers change their viewing points. <P>SOLUTION: This display system has an elastic screen 1 which is made of a flexible material so that the screen surface can be bent, and actuators 3 which support the elastic screen 1 from the back by pushing to deform it, and stores a plurality of projection surface patterns of the elastic screen 1 in a memory. When one of the projection surface pattern stored in the memory is chosen or it detects the moving user's viewing points, it drives the actuator 3 with the actuator controller 5 to deform the elastic screen 1 following the moving viewing points and the projection surface pattern. When changing the projection surface, it distorts the images from the projector in order to cancel the distortions of the images to be displayed on the screen. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display system that allows an observer to view an image with a wide viewing angle.

  2. Description of the Related Art Conventionally, a technique described in Patent Document 1 below is known as a technique for projecting an image on a large screen and causing an observer to perform various simulated experiences.

  These virtual reality generation systems have the most information obtained from the visual senses of human senses, and account for 80% to 85% of the information obtained from all human senses. Attempts have been made to give an immersive feeling to the video by presenting the correct video. In virtual reality, in order to generate a more realistic virtual space, it is the most important element to present information to the eye. Thus, there is a need for a video display technique for realizing a more natural appearance such as wide field of view, stereoscopic view, life-size scale, etc. in addition to simply presenting a video.

As such a virtual reality generation system, as shown in Patent Document 1 below, a highly realistic image presentation system that projects a wide-field image without distortion on a hemispherical screen can be cited.
JP 2006-516333 A

  However, the above-described video display system enables video projection without distortion on the screen by the video correction technology, and can effectively cover the user's field of view with a concave screen configured by a part of a spherical shape, etc. Although wide-field image display is realized, there is a recommended viewpoint position for the screen. The recommended viewpoint position is a position close to the screen so that the viewer faces the screen and covers the field of view of the viewer.

  In the conventional video display system, if the viewpoint position is set at a location that deviates from the recommended viewpoint position (parallel movement away from the center or movement away from the screen), the video display effect may be significantly reduced. There is.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and an object thereof is to provide a video display system that reduces an uncomfortable feeling with respect to a viewer's video even when the viewpoint of the viewer changes. To do.

  The present invention relates to a distortion correction processing unit that creates a parameter for performing distortion correction on a video, a video generation unit that generates a video signal subjected to distortion correction based on the parameter created by the distortion correction processing unit, and a distortion correction unit. In order to solve the above-mentioned problem, a video display system comprising: a video projecting unit that projects a video that has been subjected to distortion correction; and a screen that displays a video projected from the video projecting unit. Is formed of a stretchable material so that the projection surface is deformed, presses and supports the screen from the opposite side of the projection surface of the screen, and stores a plurality of actuators that deform the shape of the screen and a plurality of projection surface shape patterns of the screen The memory unit, the selection unit for selecting the projection plane shape pattern stored in the memory unit, and the projection plane shape pattern selected by the selection unit And a control unit for controlling to drive the Uni actuator. In this video display system, when the projection surface shape is changed by controlling the actuator to drive the actuator, the distortion correction unit and the video generation unit are configured to project the projection surface shape pattern selected by the selection unit. The image projected from the image projecting means is distorted so that the image displayed in step 3 disappears.

  According to the present invention, when the actuator is driven to change the projection surface shape pattern selected by the selection unit and the projection surface shape is changed, the image displayed on the projection surface is distorted. Since the image projected from the projection means is distorted, even if the observer's viewpoint changes, it is possible to reduce the viewer's discomfort with the image.

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

  As shown in FIG. 1, the video display system to which the present invention is applied has a distortion correction process for displaying video light without distortion on a stretchable screen 1 which is a video display means having a projection surface made of a stretchable material. The image light is emitted from the projector 2 as the image projection means by the image signal as a result of performing the above.

  On the back side of the projection surface of the stretchable screen 1, a plurality of actuators 3 for deforming the stretchable screen 1 are arranged in an array. Each actuator 3 is a direct acting actuator that presses and supports the back surface of the stretchable screen 1. The actuator 3 moves linearly when supplied with a control signal from the actuator control device 5. The elastic screen 1 is expanded and contracted by the linear movement of the actuator 3 to change the projection surface shape. The elastic screen 1 can be deformed into an arbitrary shape, but the case where it is mainly concave with respect to the observer will be described.

  The actuator control device 5 is connected to each actuator 3, and shape information of the stretchable screen 1 is supplied from the control device 4. For example, as shown in FIG. 2, when the shape of the stretchable screen 1 is a shape with a concave surface facing the observer, the actuator control device 5 causes the periphery of the stretchable screen 1 to approach the observer side. In addition, control for linearly moving the actuator 3 at the position and / or control for linearly moving the actuator 3 at the position so as to keep the central portion of the stretchable screen 1 away from the observer. In this video display system, the deformable range of the stretchable screen 1 is set as shown in the top view of FIG. 2A and the side view of FIG.

  The control device 4 supplies the shape information of the stretchable screen 1 to the actuator control device 5 and also supplies the projector 2 with a video signal subjected to distortion correction processing according to the shape of the stretchable screen 1 and the like. As shown in FIG. 3, the control device 4 includes a selection unit 11 that selects the shape of the stretchable screen 1, a memory unit 12 that stores shape information of the stretchable screen 1, and the shape of the stretchable screen 1. A distortion video correction processing unit 13 that performs distortion correction on the video signal, and a video generation unit 14 that generates a video signal subjected to the distortion correction processing.

  The memory unit 12 stores shape information of the stretchable screen 1. This shape information sets the movement distance of each actuator 3 for each shape of the stretchable screen 1. In the shape information, for example, when the projection surface of the stretchable screen 1 is deformed into a plurality of concave shapes, the movement distance of each actuator 3 is set for each pattern. The shape information is output to the actuator control device 5 and the distortion image correction processing unit 13 when the selection unit 11 sends the selection result of the concave shape pattern of the stretchable screen 1 to the memory unit 12.

  When the shape information is supplied to the actuator control device 5, the actuator control device 5 supplies the actuator 3 with a control signal for linearly driving each actuator 3 by the movement distance of each actuator 3 set by the shape information. The stretchable screen 1 is deformed so as to have the concave shape selected by the selection unit 11.

  The selection unit 11 selects the shape of the stretchable screen 1 and supplies the selection result to the memory unit 12. The selection unit 11 supplies to the actuator control device 5 which shape information among the shape information stored in the memory unit 12 such as the selection result of the concave shape pattern of the stretchable screen 1 and the selection result of the viewpoint position. A signal that can determine whether or not is supplied to the memory unit 12. The selection unit 11 can be realized by a user interface or the like that can select a concave pattern of the stretchable screen 1 by a user operation.

  The distorted video correction processing unit 13 creates a correction map (parameter) for correcting the distortion of the video signal output to the projector 2 based on the shape information supplied from the memory unit 12. This correction map is projected when an image is displayed on the stretchable screen 1 based on the shape of the stretchable screen 1, the relative position between the stretchable screen 1 and the projector 2, and the relative posture between the stretchable screen 1 and the projector 2. It is a map which correct | amends a video signal so that distortion may be eliminated in the image | video displayed on a surface.

  This correction map may be prepared in advance for each concave shape pattern of the stretchable screen 1 and stored in the distortion image correction processing unit 13, and is created from the memory unit 12 based on the shape information of the stretchable screen 1. May be. The correction map is created so as to perform a combination of distortion correction that distorts the image corresponding to the concave shape of the stretchable screen 1 and distortion correction that further corrects the image according to the installation position and installation posture of the projector 2. ing. Thereby, even when the concave pattern of the stretchable screen 1, the relative position between the stretchable screen 1 and the projector 2, and the relative posture change, an image without distortion can be projected on the stretchable screen 1.

  The video generation unit 14 performs coordinate conversion on the video signal stored in advance according to the correction map supplied from the distorted video correction processing unit 13, creates a video signal to be output to the projector 2, and outputs the video signal to the projector 2.

  As described above, the video display system supplies the shape information from the memory unit 12 to the actuator control device 5 and drives the actuator 3 in response to the selection of the concave shape pattern of the stretchable screen 1 by the selection unit 11. Thus, at the same time the concave shape of the stretchable screen 1 is changed, the distortion image correction processing unit 13 selects a correction map corresponding to the concave shape pattern of the stretchable screen 1 and the image generation unit 14 performs distortion correction. Can be projected from the projector 2.

  As described above in detail, according to the video display system to which the present invention is applied, the projection surface shape of the stretchable screen 1 is deformed into an arbitrary shape, and distortion correction is performed on the video signal according to the deformed shape. This allows the user to visually recognize an image without distortion.

  For example, as shown in FIG. 4A, from the state where the image is observed at the viewpoint position A facing the central axis a of the stretchable screen 1, from the viewpoint position A as shown in FIG. When it is desired to change the viewpoint position B to the left and observe the image, the state where the image of the stretchable screen 1 is observed from the viewpoint position A is uncomfortable. That is, as shown in FIG. 4C, it is necessary to make the central portion of the stretchable screen 1 face the viewpoint position B on the central axis a ′ obtained by moving the stretchable screen 1 and the projector 2 to the left side. is there. On the other hand, the video display system to which the present invention is applied selects the concave pattern of the stretchable screen 1 when viewing the video displayed on the stretchable screen 1 from the viewpoint position B by the selection unit 11, Based on the shape information corresponding to the pattern from the memory unit 12, the actuator controller 5 changes the concave shape of the stretchable screen 1 as shown in FIG. It can be a position (on the central axis a ′) facing the viewpoint position B. In addition, the rectangular dotted line shown to Fig.4 (a)-(d) has shown the deformable range of the stretchable screen 1. FIG.

  Also, as shown in FIG. 5A, from the state of observing the image displayed on the elastic screen 1 at the viewing angle θ1 from the viewpoint position A, the elastic screen 1 as shown in FIG. If the viewing position is set to the viewpoint position B, the viewing angle θ1 is maintained as shown in FIG. 5C or expanded or contracted as shown in FIG. The concave shape of the stretchable screen 1 can be changed so that the central portion of the flexible screen 1 approaches the viewpoint position B. In FIG. 5C, the stretchable screen 1 is enlarged from the dotted line indicating the range in which the stretchable screen 1 can be deformed, but even if the stretchable screen 1 is deformed only within the deformable range. good.

  Thus, the positional relationship between the stretchable screen 1 and the viewpoint position is changed by operating the selection unit 11 so that the user or the administrator changes the concave pattern of the stretchable screen 1 according to the change of the viewpoint position. However, it is possible to reduce the user's uncomfortable feeling by observing an image without distortion.

  Further, even if the viewpoint position is changed, it is not necessary to change the positions of the stretchable screen 1 and the projector 2 as shown in FIG. 4C, and the system configuration can be avoided from becoming complicated.

  In the example described above, a stereoscopic image may be displayed on the stretchable screen 1. In this case, the video display system allows the user to wear polarized glasses having different polarization directions of the video light transmitted through the right eye and the left eye, so that parallax is given to the user from the projector 2 in the polarization method or the time division method. A plurality of types of video light having different polarization directions are emitted. When a stereoscopic image is displayed on the stretchable screen 1 by the polarization method, a material that holds the polarization direction of the image light is used as the stretchable screen 1, and the polarization directions are different from the two light exit ports of the projector 2. The image light for the eye and the image light for the left eye are emitted. In the above description, an example of a single projector 2 has been described. However, two projectors, that is, a projector that emits a right-eye image and a projector that emits a left-eye image may be used. When displaying a stereoscopic image on the stretchable screen 1 in a time-sharing manner, right-eye video light and left-eye video light are alternately emitted in a time-sharing manner from a single light exit, and the right-eye video light and The emission timing of the image light for the left eye is synchronized with the switching timing of the right eye and the left eye shutter of the liquid crystal shutter glasses.

  In addition, the shape of the stretchable screen 1 is not limited to the concave shape, but may be a planar shape or a quadratic curved surface shape using a part of a cylindrical shape, a hemispherical dome shape, a planar shape, or a quadratic curved surface. The shape which combined variously may be selectable. Even with the stretchable screen 1 that can be deformed into various shapes as described above, the video display system performs a video distortion correction process according to the shape.

  Next, in the video display system described above, following the parallel movement of the user's viewpoint position in the horizontal direction, the shape of the stretchable screen 1 is automatically changed by the change of the user's viewpoint position, and the viewpoint position is also changed. A case will be described in which the correction map for distortion correction is automatically changed in accordance with the change in. The same parts as those in the video display system described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this video display system, the stretchable screen 1 is formed in a projection plane shape so as to constitute a part of a virtual sphere centered on a predetermined initial center position. When the viewpoint position measurement unit 21 detects the parallel movement of the viewpoint position with respect to the stretchable screen 1, the actuator controller 5 sets the center position of the virtual sphere to a predetermined initial position while maintaining the radius of the projection surface shape. The projection plane shape is changed so as to form a part of a virtual sphere centered on the center position after the movement by moving from the center position to the position translated by the translation of the viewpoint position.

  As shown in FIG. 6, this video display system is different from the video display system shown in FIG. 3 in that it includes a viewpoint position measurement unit 21 that detects the viewpoint position of the user. The viewpoint position measurement unit 21 is configured, for example, by having a user wear glasses and mounting a three-dimensional position measuring device on the glasses. The viewpoint position measurement unit 21 sets a concave shape pattern for each viewpoint movement area of the user in advance, for example, when the viewpoint moves to a movement range of 0 to 5 cm from the current viewpoint position, the representative value is 3 cm. When the viewpoint moves from the viewpoint position to an area of 5 to 10 cm, it is set to be recognized as a viewpoint movement of 8 cm as a representative value. When the movement of the viewpoint position of the user is detected, the viewpoint position measurement unit 21 causes the selection unit 11 to select the concave shape pattern of the stretchable screen from the viewpoint movement region, and the distortion image correction processing unit 13 and the actuator from the memory unit 12. The control device 5 is made to output shape information. The actuator control device 5 can change the concave shape of the stretchable screen 1 and create an optimal distortion correction correction map by the distortion image correction processing unit 13 to project an image corrected by the distortion from the projector 2. . Thereby, the discomfort with respect to a user's image | video by changing the relative position of the elastic screen 1 and a user's viewpoint position is reduced.

  Further, the video display system may output the parallel movement of the viewpoint position measured by the viewpoint position measurement unit 21 to the actuator control device 5 as indicated by a dotted line in FIG. In this case, the actuator control device 5 outputs the translation amount of the viewpoint position to the distorted image correction processing unit 13 and drives the actuator 3 following the translation of the viewpoint position to Change the shape. Further, the distorted video correction processing unit 13 supplied with the parallel movement amount of the viewpoint position changes the correction map according to the change in the viewpoint position, and changes the distortion correction processing in the video generation unit 14.

For example, as shown in FIG. 7A, from the viewpoint position a, the concave surface depth D, the virtual center point A, and the concave surface shape (hemisphere) that constitutes a part of the virtual sphere 31 centered on the virtual center point A. Assume that an image displayed on the stretchable screen 1 is being viewed. In the state shown in FIG. 7A, the stretchable screen 1 is formed in a spherical shape centered on a virtual center point A at a certain initial center position. When the linear distance from the virtual center point A to the projection surface, that is, the concave surface depth D is R, the coordinates of the surface of the stretchable screen 1 with the virtual center point A at the initial center position as the origin of the three-dimensional coordinates are
X ² + Y ² + Z ² = R ²
Is represented by In this equation, the horizontal direction with respect to the user is the X axis, the vertical direction is the Y axis, and the projection plane direction is the Z axis.

  By designating the arrangement position of each actuator 3 by (X, Y) coordinates, the tip position of each actuator 3 for constituting the stretchable screen 1 is represented by the Z coordinate in the above formula and calculated by the above formula. The In the state of FIG. 7A, the viewpoint position measurement unit 21 measures the viewpoint position a, and uses the viewpoint position a as a three-dimensional coordinate (x1) with the virtual center point A being the initial center position as the origin. , Y1, z1).

  When the viewpoint position measurement unit 21 detects that the viewpoint position b has been moved in the horizontal direction as shown in FIG. 7B, the viewpoint position measurement unit 21 detects the moved viewpoint position b (x2, y2, z1). Is output to the selection unit 11 or the actuator control device 5. In this case, it is necessary to move the virtual sphere and the virtual center point by the moving distance of the viewpoint position detected by the viewpoint position measurement unit 21 in order to translate the center of the virtual sphere 31 following the parallel movement of the viewpoint position. There is. As shown in FIG. 7C, assuming the viewpoint position b, a virtual sphere 32 having the virtual center point B at the initial center position as the virtual center point B and the virtual center point B as the origin is assumed. The movement position (Z coordinate) of the tip of each actuator 3 is calculated from the arrangement position coordinates (X, Y) of each actuator 3. Then, the actuator is moved by the actuator control device 5 to deform the projection surface of the stretchable screen 1 as shown in FIG.

  In this way, even if the viewpoint position is translated, the elastic screen 1 is configured with a part of the virtual sphere centered on the position translated by the parallel movement of the user's viewpoint without changing the radius of the virtual sphere. It becomes possible. That is, when the user's viewpoint moves in parallel, the deepest part of the stretchable screen 1 constituted by a part of the virtual sphere is arranged in front of the viewpoint position (Z-axis direction).

  Specifically, since the video display system limits the deformable range of the stretchable screen 1 as shown in FIG. 8, the virtual center point A is the center as shown in FIG. In the state where the concave elastic screen 1 constituting a part of the virtual sphere is used, when the viewpoint position b is moved leftward from the viewpoint position a, the viewpoint position measurement unit 21 detects the change in the viewpoint position. Then, as shown in FIG. 8 (b), it expands and contracts within the deformable range so as to become a part of the virtual sphere centered on the virtual center point B moved from the virtual center point A by the movement of the viewpoint position. Deformable screen 1 is deformed. When the viewpoint position c is moved rightward from the viewpoint position a as shown in FIG. 8A, the virtual position moved from the virtual center point A by the movement of the viewpoint position as shown in FIG. 8C. The stretchable screen 1 is deformed within a deformable range so as to be a part of a virtual sphere centered on the center point C.

  As described above, in the video display system, when the parallel movement of the viewpoint position relative to the stretchable screen 1 is detected by the viewpoint position measurement unit 21, the actuator control device 5 maintains the radius of the projection plane shape in FIG. A part of the virtual sphere centered on the center position after the movement by moving the center position of the projection plane shape from the predetermined initial center position as shown in FIG. The shape of the projection plane can be changed so as to constitute

  As described above, according to the video display system to which the present invention is applied, the shape of the stretchable screen 1 is automatically changed following the parallel movement of the user's viewpoint position, and the video distortion correction processing is performed. It is possible to reduce the uncomfortable feeling when viewing the video after moving the viewpoint.

  Next, in the video display system to which the present invention is applied, the shape of the stretchable screen 1 is changed and the image is distorted following the rotation of the user's viewpoint position in the horizontal direction or the vertical direction with respect to the stretchable screen 1. The correction process will be described.

  This video display system includes a viewpoint position measurement unit 21 as in FIG. The same parts as those in the video display system described above are denoted by the same reference numerals, and detailed description thereof is omitted. In this video display system, the shape of the projection surface of the stretchable screen 1 is formed so as to constitute a part of a virtual sphere centered on a predetermined initial center position. When the viewpoint position measurement unit 21 detects the rotation of the viewpoint position with respect to the stretchable screen 1 in the horizontal direction or the vertical direction, the actuator control device 5 maintains the radius of the projection plane shape while maintaining the projection plane shape radius. Rotate the center position in the rotation direction in which the viewpoint position is rotated by the rotation angle at which the viewpoint position is rotated, and change the projection plane shape so as to form a part of the virtual sphere centered on the center position after the rotation Let

  The viewpoint position measurement unit 21 detects, for example, a horizontal or vertical rotational movement of the glasses worn by the user with a three-dimensional position measurement device. The viewpoint position measurement unit 21 causes the selection unit 11 to select a concave shape pattern of the stretchable screen 1 when detecting the horizontal or vertical rotational movement of the user's viewpoint position, and generates a distorted image from the memory unit 12. The correction processing unit 13 and the actuator control device 5 are made to output shape information. The actuator control device 5 can change the concave shape of the stretchable screen 1 and create an optimal distortion correction correction map by the distortion image correction processing unit 13 to project an image corrected by the distortion from the projector 2. . Thereby, the discomfort with respect to a user's image | video by changing the relative position of the elastic screen 1 and a user's viewpoint position is reduced.

  For example, as shown in FIG. 9 (a), the concave surface depth D, the virtual center point A (x1, y1, z1), and a part of the virtual sphere 31 centered on the virtual center point A are configured from the viewpoint position a. The viewpoint position measurement unit 21 indicates that the viewpoint position has been rotated by the angle θ in the horizontal direction as shown in FIG. 9B while viewing the image displayed on the concave-shaped (hemispherical) stretchable screen 1. Suppose that it is detected. In this case, as shown in FIG. 9C, the distance r from the viewpoint position a to the virtual center point A is set to the radius r by the rotation angle of the viewpoint position detected by the viewpoint position measurement unit 21. A virtual center point B (x2, y2, z2) obtained by rotating the virtual center point from the virtual center point A is set on the virtual sphere 33. Then, as shown in FIG. 9 (d), a virtual sphere 34 centered on the virtual center point B after the rotational movement is set, and as shown in FIG. 9 (e), a concave surface with the virtual center point B as the center is set. The stretchable screen 1 is deformed into a concave shape constituting a part of the virtual sphere 34 with the depth D as a radius.

Since the video display system has a limited deformable range of the stretchable screen 1 as shown in FIG. 10, the virtual center point A (x1, y1, z1) is centered as shown in FIG. When the viewpoint position is rotated and moved in the left direction by an angle θ _{L in the} state where the concave elastic screen 1 constituting a part of the virtual sphere is set, the viewpoint position measurement unit 21 detects the change in the viewpoint position. . Then, as shown in FIG. 10 (b), a part of a virtual sphere centered on a virtual center point B (x2, y2, z2) rotated by an angle θ _L from the virtual center point A, and deformed The elastic screen 1 is deformed within a possible range. At this time, a virtual sphere with the virtual center point B (x2, y2, z2) as the origin is set, and R and the arrangement position (X, Y) of each actuator 3 are substituted into the above equation. Calculate the Z-axis position. Further, when the viewpoint position is rotated to the right by the angle θ _R from the state of FIG. 10A, the virtual center point that is rotated by the angle θ _R from the virtual center point A as shown in FIG. 10C. The elastic screen 1 is deformed within a deformable range, which is a part of a virtual sphere centered on C (x3, y3, z3). At this time, a virtual sphere with the virtual center point B (x3, y3, z3) as the origin is set, and R and the arrangement position (X, Y) of each actuator 3 are substituted into the above formula, Calculate the Z-axis position.

  As described above, in the video display system, when the rotational movement of the viewpoint position is detected by the viewpoint position measurement unit 21, the radius of the projection surface shape is maintained by the actuator control device 5 as shown in FIG. The center position of the projection surface shape is moved from the predetermined initial center position to the position rotated by the rotational movement of the viewpoint position, and a part of the virtual sphere centering on the moved center position is formed. The projection surface shape can be changed.

  As described above, according to the video display system to which the present invention is applied, the shape of the stretchable screen 1 is automatically changed following the rotational movement of the user's viewpoint position, and the video distortion correction processing is performed. It is possible to reduce the uncomfortable feeling when viewing the video after moving the viewpoint.

  Next, in the video display system to which the present invention is applied, the shape of the stretchable screen 1 is changed and the image distortion correction processing is performed following the back and forth movement of the user's viewpoint position with respect to the stretchable screen 1. Will be described.

  This video display system includes a viewpoint position measurement unit 21 as in FIG. The same parts as those in the video display system described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the video display system, the projection surface shape of the stretchable screen 1 is formed so as to form a part of a virtual sphere centered on a predetermined initial center position, and the viewpoint position relative to the stretchable screen 1 is the viewpoint position measurement unit 21. It is detected that has moved in a direction approaching or moving away. In this case, the actuator control device 5 sets a virtual sphere in which the center position is moved in a direction in which the viewpoint position approaches or moves away from a predetermined initial center position and a distance in which the viewpoint position approaches or moves away. Further, the projection plane position that is the farthest from the viewpoint position before the movement of the viewpoint position is moved by the distance that the viewpoint position approaches or moves away. Then, the projection of the stretchable screen 1 is made so that the end position of the projection surface of the stretchable screen 1, the virtual sphere, and the projected plane position that is the farthest from the moved viewpoint position are on an approximate curve. Change the surface shape.

  The viewpoint position measurement unit 21 detects, for example, a back-and-forth movement of glasses worn by the user using a three-dimensional position measurement device. When the viewpoint position measurement unit 21 detects the back-and-forth movement of the user's viewpoint position with respect to the stretchable screen 1, the viewpoint position measurement unit 21 causes the selection unit 11 to select a concave pattern of the stretchable screen 1 and corrects the distortion image from the memory unit 12. The processing unit 13 and the actuator control device 5 are made to output shape information. The actuator control device 5 can change the concave shape of the stretchable screen 1 and create an optimal distortion correction correction map by the distortion image correction processing unit 13 to project an image corrected by the distortion from the projector 2. . Thereby, the discomfort with respect to a user's image | video by changing the relative position of the elastic screen 1 and a user's viewpoint position is reduced.

  For example, as shown in FIG. 11A, the concave surface depth D, the virtual center point A (x1, y1, z1), and a part of the virtual sphere 31 centered on the virtual center point A are configured from the viewpoint position a. The viewpoint position indicates that the viewpoint position has advanced by a distance δ and moved to the viewpoint position b as shown in FIG. 11B while viewing the image displayed on the concave-shaped (hemispherical) stretchable screen 1. It is assumed that the detection is made by the measurement unit 21. In this case, as shown in FIG. 11 (c), the virtual center point A is moved by the advance distance δ of the viewpoint position detected by the viewpoint position measurement unit 21, and the virtual sphere 35 centered on the virtual center point B is formed. Set. Also, as shown in FIG. 11 (d), the position of the stretchable screen 1 farthest from the user's viewpoint position a in the state of FIG. 11 (a) is moved by a distance δ to set a new screen position 36. . The projection surface of the stretchable screen 1 is configured so as to form a part of the virtual sphere 35 with the position farthest from the user's viewpoint position b as the screen position 36 while maintaining the position of the end 1a of the stretchable screen 1. Approximate the shape. In such a video display system, in order to fix the end 1a of the stretchable screen 1, the actuator 3 positioned at the peripheral edge of the stretchable screen 1 is controlled to be fixed.

  Since the deformable range of the stretchable screen 1 is limited as shown in FIG. 12, the video display system is centered on the virtual center point A (x1, y1, z1) as shown in FIG. When the viewpoint position moves by a distance δ in the forward direction in the state where the concave elastic screen 1 constituting a part of the virtual sphere is set, the forward movement from the virtual center point A is performed as shown in FIG. A part of the virtual sphere centered on the virtual center point B (x2, y2, z2) moved by the distance δ, which is the farthest from the user's viewpoint position, is moved by the distance δ, and the stretchable screen The stretchable screen 1 is deformed so as to hold the end of 1. At this time, a virtual sphere with the virtual center point B (x2, y2, z2) as the origin is set, and R and the arrangement position (X, Y) of each actuator 3 are substituted into the above equation. Calculate the Z-axis position. Further, when the viewpoint position moves in the backward direction by the distance δ from the state of FIG. 12A, as shown in FIG. 12C, the virtual center point C ( a stretchable screen that is a part of a virtual sphere centered around x3, y3, z3) and that moves the screen position farthest from the user's viewpoint position by a distance δ and holds the end of the stretchable screen 1 1 is deformed. At this time, a virtual sphere with the virtual center point B (x3, y3, z3) as the origin is set, and R and the arrangement position (X, Y) of each actuator 3 are substituted into the above formula, Calculate the Z-axis position.

  According to such a video display system, even if the user's viewpoint position moves in the front-rear direction with respect to the stretchable screen 1, the distance between the deepest portion of the stretchable screen 1 and the user's viewpoint position is shown in FIG. It can be kept constant over the distances L1 to L3, and the phenomenon that the user's viewpoint position is too close or too far from the stretchable screen 1 can be reduced.

  As described above, according to the video display system to which the present invention is applied, the shape of the stretchable screen 1 is automatically changed following the back-and-forth movement of the user's viewpoint position, and the video distortion correction processing is performed. It is possible to reduce the uncomfortable feeling when viewing the video after moving the viewpoint.

  Next, a configuration in which the shape of the stretchable screen 1 can be finely adjusted by the user in the video display system that can change the concave shape of the stretchable screen 1 as described above will be described.

  This video display system is different from the video display system described above in that a shape input device 41 operated by a user is connected to the actuator control device 5 as shown in FIG. As shown in FIGS. 13 and 14, the shape input device 41 is based on a shape input unit 51 configured by arranging slide type linear motion sensors in an array, and a signal input by the shape input unit 51. And a shape generation unit 52 for generating shape information. When the user presses the linear motion sensor, the shape input unit 51 generates an identification signal indicating which linear motion sensor has been operated and a signal indicating the linear motion operation amount of each linear motion sensor. To 52. The shape input device 41 may have an input mechanism with high curvature or a configuration capable of changing the shape by moving the center position while keeping the spherical shape as it is.

  The shape generation unit 52 generates shape information based on the signal from the shape input unit 51 and outputs the shape information to the distortion image correction processing unit 13 and the actuator control device 5. The shape generation unit 52 corresponds to the correspondence between the shape input unit 51 (linear motion sensor) operated by the user and each actuator 3 to be linearly driven, and the linear operation amount of the shape input unit 51 and the linear motion drive amount of the actuator 3. The correspondence relationship is stored. Then, the shape generation unit 52 outputs a parameter for driving the actuator 3 to the actuator control device 5 in accordance with a signal from the shape input device 41.

  Then, the actuator control device 5 linearly drives the actuator 3 corresponding to the shape input unit 51 operated by the user by an amount corresponding to the operation amount with respect to the shape input unit 51 according to the parameter from the shape generation unit 52. Let The distorted image correction processing unit 13 obtains a change in the projection plane shape of the stretchable screen 1 with respect to the user's viewpoint position from a parameter for linearly driving the actuator 3 from the shape generation unit 52, and changes the projection plane shape. Then, the correction map is changed or corrected, and the distortion correction processing in the video generation unit 14 is updated.

  In this video display system, for example, when the shape input device 41 includes only the shape input unit 51 and is configured by a mechanism that reproduces the current projection surface shape of the stretchable screen 1, the projection surface shape can be directly input. Anyway. For example, the configuration is such that the user presses the sphere against the shape input unit, and the shape corresponding to the pressing degree of the sphere is reproduced on the stretchable screen 1. In this case, as indicated by a dotted line in FIG. 14, a change in the projection surface shape of the shape input unit 51 is directly input to the actuator control device 5. Then, the actuator control device 5 outputs the shape change amount of the shape input unit 51 to the distorted image correction processing unit 13 and drives the actuator 3 following the change of the shape to change the concave shape of the stretchable screen 1. change. Further, the distortion video correction processing unit 13 supplied with the shape change amount changes the correction map to change the distortion correction processing in the video generation unit 14.

  Such a video display system allows the user to operate the shape input device 41 to change the concave surface shape and distortion correction processing of the stretchable screen 1 following the change of the viewpoint position of the user as described above. The video can be corrected so that the user does not feel a sense of incongruity.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

It is a figure which shows schematic structure of the video display system to which this invention is applied. It is the upper side figure and side view which show the structure of an actuator and an elastic screen. It is a block diagram which shows the structure of the video display system to which this invention is applied. It is a figure explaining the principle which changes the concave surface shape of an elastic screen, when a user's viewpoint position moves in parallel with respect to an elastic screen. It is a figure explaining the principle which changes the concave surface shape of an elastic screen when a user's viewpoint position moves to the front-back direction with respect to an elastic screen. It is a block diagram which shows the structure provided with the viewpoint position measurement part in the video display system to which this invention is applied. It is another figure explaining the principle which changes the concave surface shape of an elastic screen, when a user's viewpoint position moves in parallel with respect to an elastic screen. In the video display system to which the present invention is applied, when the user's viewpoint position is translated in the horizontal direction with respect to the stretchable screen, a specific example of changing the concave shape of the stretchable screen is described. ) Is the initial state, (b) is the change in the concave shape of the stretchable screen when the user's viewpoint position is translated leftward from the initial state, and (c) is the user's viewpoint position parallel to the right direction from the initial state. It is a change in the concave shape of the stretchable screen when moved. It is a figure explaining the principle which changes the concave surface shape of an elastic screen when a user's viewpoint position rotates to a horizontal direction or a perpendicular direction with respect to an elastic screen. In the video display system to which the present invention is applied, it is a diagram for explaining a specific example of changing the concave shape of the stretchable screen when the user's viewpoint position is rotated in the horizontal direction or the vertical direction with respect to the stretchable screen. (A) is the initial state, (b) is the change in the concave shape of the stretchable screen when the user's viewpoint position is rotated to the left from the initial state, and (c) is the user's viewpoint position to the right from the initial state. This is a change in the concave shape of the stretchable screen when it is rotated and rotated. It is a figure explaining the principle which changes the concave surface shape of an elastic screen when a user's viewpoint position moves to the front-back direction with respect to an elastic screen. In the video display system to which the present invention is applied, when the viewpoint position of the user moves in the front-rear direction with respect to the stretchable screen, a specific example of changing the concave shape of the stretchable screen is described. Is the initial state, (b) is the change in the concave shape of the stretchable screen when the user's viewpoint position approaches from the initial state, and (c) is when the user's viewpoint position is away from the initial state. This is a change in the concave shape of the elastic screen. It is a figure which shows schematic structure which changes a projection surface shape by a user's operation in the video display system to which this invention is applied. It is a block diagram which shows the structure which changes a projection surface shape by a user's operation in the video display system to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic screen 1a Edge 2 Projector 3 Actuator 4 Control apparatus 5 Actuator control apparatus 11 Selection part 12 Memory part 13 Image | video correction | amendment process part 14 Image | video production | generation part 21 Viewpoint position measurement part 31 Virtual sphere 32 Virtual sphere 33 Virtual sphere 34 Virtual sphere 35 Virtual sphere 36 Screen position 41 Shape input device 51 Shape input unit 52 Shape generation unit

Claims (6)

Distortion correction processing means for creating parameters for performing distortion correction on video, video generation means for generating a video signal subjected to distortion correction based on the parameters created by the distortion correction processing means, and distortion by the distortion correction means A video display system comprising: a video projection unit that projects a corrected video; and a screen that displays a video projected from the video projection unit,
The screen is formed of an elastic material so that the projection surface is deformed,
A plurality of actuators that press and support the screen from the opposite side of the projection surface of the screen and deform the shape of the screen;
A memory unit that stores a plurality of projection surface shape patterns of the screen;
A selection unit for selecting the projection surface shape pattern stored in the memory unit;
A control unit that controls to drive the actuator so as to be the projection plane shape pattern selected by the selection unit,
The distortion correction unit and the video generation unit distort the video projected from the video projection unit so that the video displayed on the projection plane of the projection plane shape pattern selected by the selection unit is free from distortion. Video display system. It further includes a viewpoint position measurement unit that measures the viewpoint of the user,
The video display system according to claim 1, wherein the control unit drives the actuator according to a change in the viewpoint position of the user measured by the viewpoint position measurement unit, and changes the shape of the screen. The screen is formed with a projection surface shape so as to form a part of a virtual sphere centered on a predetermined initial center position,
When the viewpoint position measurement unit detects the parallel movement of the viewpoint position with respect to the screen, the control unit sets the center position of the virtual sphere to the predetermined initial center position while maintaining the radius of the projection surface shape. The projection plane shape is changed so as to form a part of a virtual sphere centered on the center position after the movement by moving to a position translated from the viewpoint position by a translation amount. Item 3. The video display system according to Item 2. The screen is formed with a projection surface shape so as to form a part of a virtual sphere centered on a predetermined initial center position,
When the viewpoint position measurement unit detects rotation of the viewpoint position with respect to the screen in the horizontal direction or the vertical direction, the control unit determines the center position of the virtual sphere while maintaining the radius of the projection surface shape. The projection plane shape is changed so as to form a part of a virtual sphere centered on the center position after the rotation by rotating the viewpoint position in the rotational direction in which the viewpoint position is rotated. The video display system according to claim 2. The screen is formed with a projection surface shape so as to form a part of a virtual sphere centered on a predetermined initial center position,
When it is detected by the viewpoint position measurement unit that the viewpoint position has moved in a direction in which the viewpoint position approaches or moves away from the stretchable screen, the control unit moves in a direction in which the viewpoint position approaches or moves away from a predetermined initial center position, or Set a virtual sphere with the center position moved away from it, move the projection plane position farthest from the viewpoint position before moving the viewpoint position by moving the viewpoint position closer or further away, and the elasticity Adjust the projection screen shape of the stretchable screen so that it is on an approximate curve that approximates the end position of the projection surface of the screen, the virtual sphere after movement, and the projection surface position farthest from the moved viewpoint position. The video display system according to claim 2, wherein the video display system is changed. It further comprises shape input means for inputting the screen shape from the user,
The video display system according to claim 1, wherein the control unit controls the actuator so as to reproduce a screen shape input by the shape input unit.

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