JP2012255883A - Image projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image projection system which can correct an image according to deformation and/or displacement states of a three-dimensional object while dispensing with a dedicated screen and a connection between the screen and the projector.SOLUTION: An image correction unit IS does not correct image data for projection when determining that the projection plane of a three-dimensional object OBJ is not tilted on the basis of signals from an invisible light imaging unit CA having imaged an invisible light image projected so as to be superimposed on a visible light image, while performing affine transformation, trapezoidal correction and the like when determining that the projection plane is tilted.

Description

  The present invention relates to a video projection system, for example, a video projection system of a type that displays a video by scanning a laser beam or the like.

  For example, in Patent Document 1, the amount of deformation / displacement of the screen is detected by monitoring the driving amount of a motor that rotates the screen, and even if the screen is deformed / displaced, the projection image of the projector is observed accordingly. There has been proposed an image forming apparatus capable of correcting and projecting a natural image without distortion for a person.

JP 2009-180965 A JP-A-2005-277900

  However, in the technique of Patent Document 1, in order to accurately detect the state of the screen, the state detection unit is interposed between the motor that rotates the screen and the operation control device, and is applied to the motor from the operation control device. The detected voltage is detected by a voltage detector (not shown), and the orientation of the screen is detected based on the detection result. In other words, the technique of Patent Document 1 requires a dedicated screen that can mechanically control deformation / displacement, and the screen and the projection device must be connected to obtain the deformation / displacement state of the dedicated screen. There is a restriction that it must be. Further, the apparatus configuration becomes large, and it is difficult to apply to a small projection apparatus.

  On the other hand, Patent Document 2 includes a data compensation unit that compensates two-dimensional projection data according to the surface shape of the screen that is three-dimensionally deformed, and an image is displayed on the screen according to the projection data compensated by the data compensation unit. An image displayed on the screen can be changed by projecting and compensating the two-dimensional projection data in consideration of the relative position of the projector with respect to the screen, and the projector with respect to the screen. A technique is disclosed in which an appropriate image can be displayed on the screen even if the relative position of the screen is changed.

  However, according to the technique of Patent Document 2, the shape detection unit monitors the driving amount of the actuator that displaces the screen by monitoring the rotation amount of the motor in the actuator by using, for example, an encoder. The state of deformation / displacement is detected. That is, in the technique of Patent Document 2, a dedicated screen that can be mechanically deformed / displaced is required, and in order to acquire the deformed / displaced state of the dedicated screen, the screen and the projection device must be connected. There is a restriction that it must not. Further, the apparatus configuration becomes large, and it is difficult to apply to a small projection apparatus.

  The present invention has been made in view of the above-described problems, and corrects an image according to the deformation and / or displacement state of a three-dimensional object while requiring no connection between a dedicated screen and a screen / projector. An object of the present invention is to provide a video projection system that can perform the above.

The video projection system according to claim 1,
An image projection system that projects an image on a three-dimensional object,
A visible light projection unit that projects a visible light image onto the three-dimensional object;
An invisible light projection unit that projects an invisible light image superimposed on the visible light image;
An invisible light photographing unit for photographing an area including the invisible light image;
A shape recognition unit for recognizing deformation and / or displacement state of the three-dimensional object placed in the visible light image based on a signal from the invisible light photographing unit;
And a video correction unit that corrects the visible light video based on a recognition result of the shape recognition unit.

  According to the present invention, since the invisible light projection unit projects the invisible light image superimposed on the visible light image, the observer can enjoy the visible light image without being disturbed by the invisible light. The invisible light photographing unit photographs an area including the invisible light image, and the shape recognizing unit detects the three-dimensional object placed in the visible light image based on a signal from the invisible light photographing unit. Since the deformation and / or displacement state is recognized, the image correction unit can correct the visible light image based on the recognition result of the shape recognition unit, thereby connecting the dedicated screen or the screen projector. However, the image can be appropriately corrected according to the deformation and / or displacement state of the three-dimensional object. “Visible light” means, for example, light having a wavelength band of 700 nm or less, and “invisible light” means light having a wavelength band exceeding 700 nm, but the boundary between them is not limited to 700 nm. .

  A video projection system according to a second aspect is the invention according to the first aspect, wherein the three-dimensional object is deformed and / or displaced over time. According to the present invention, even when the three-dimensional object is deformed and / or displaced over time, the image can be appropriately corrected following this.

  According to a third aspect of the present invention, in the video projection system according to the first or second aspect, the visible light projection unit projects an image by scanning the emitted light, and the shape recognition unit is based on triangulation. Shape recognition is performed using acquisition of distance information. A laser scan type image projection system has been developed to project an image by scanning the emitted light. In such a laser scan type image projection system, lasers emitting three different colors of light are provided, and in addition to this, the present invention can be configured by mounting an infrared laser.

  The video projection system according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the three-dimensional object is a polyhedron, and the shape recognition unit is based on a signal from the invisible light photographing unit. The surface of the polyhedron is recognized, and the image correction unit corrects the visible light image so as to be an independent image for each surface of the polyhedron based on the recognition result of the shape recognition unit. Thereby, for example, different images can be projected on each surface of the polyhedron, and the projected image can be corrected according to the inclination of the surface.

  According to a fifth aspect of the present invention, in the video projection system according to the fourth aspect, the polyhedron is a rectangular parallelepiped.

  According to the present invention, even if the screen is deformed / displaced even though the dedicated screen is not required and the connection between the screen and the projector is not required, the projected image of the projector is accordingly distorted for the observer. It is possible to provide a video projection system capable of correcting and projecting the image to a natural one with no image.

1 is a block diagram showing a schematic configuration of a video projection system PS according to an embodiment. It is a block diagram which shows the specific structure of video projection system PS. 3 is a plan view showing a detailed configuration of the optical scanner 9. FIG. 4 is a cross-sectional view of the two-dimensional scanning mirror 15 in the IV-IV direction of FIG. It is a figure which displays the state which deflects the laser beam W using the two-dimensional scanning mirror. It is a flowchart which shows the aspect of an image correction. It is the figure which looked at the rectangular parallelepiped in the rotation axis direction. It is a figure which shows the image | video projected on the surface of the rectangular parallelepiped rotated for every unit angle. It is a figure which shows the image | video projected on the surface of the rectangular parallelepiped.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a video projection system PS according to an embodiment of the present invention. In FIG. 1, a video projection system PS includes a visible light projection unit PJ1 that projects a visible light image onto a three-dimensional object OBJ, and an invisible light projection unit PJ2 that projects an invisible light image superimposed on the visible light image. Based on a signal from an invisible light photographing unit (here, an infrared camera) CA that captures an area including the invisible light image, and a signal from the invisible light photographing unit, a three-dimensional object OBJ placed in the visible light image And / or a shape recognition unit MR for recognizing a displacement state, and an image correction unit IS for correcting the visible light image based on the recognition result of the shape recognition unit MR. Here, the terms video and image are used synonymously.

  More specifically, the video projection system PS will be described. FIG. 2 is a block diagram showing a specific configuration of the video projection system PS. The image projection system PS is mounted on, for example, an optical scanner projector, and includes a laser light source 7 (7r, 7g, 7b, 7IR), a collimator CL (CLr, CLg, CLb, CLIR), a laser control unit 100, and a dichroic mirror 8 (8r, 8g, 8b, 8IR), a half mirror HF, a detector PD, an optical scanner 9 (scanning unit), a phase detection unit 110, and a synchronization signal output unit 120.

  The laser control unit 100 as a driving means includes a frame memory 2, a video processing memory 3, a line buffer memory 4, a display controller 5, a modulator 6 (6r, 6g, 6b, 6IR) as a driving unit, a driver 13, and a system. A controller 14 is provided to control the laser light source 7.

  The frame memory 2 temporarily stores video data of the main video (hereinafter referred to as “main video data”) in units of one frame based on the horizontal synchronization signal and the vertical synchronization signal. Here, examples of the main video include a movie and a television program. The main video data is, for example, color video data composed of R, G, and B color components, but may be monochrome video data.

  The video data stored in the video processing memory 3 is subjected to processing for correcting distortion of the displayed video.

  The line buffer memory 4 stores main video data sequentially output in units of a plurality of lines in the horizontal direction alternately from the first area and the second area of the video processing memory 3.

  The display controller 5 having the function of the video correction unit IS controls the writing of main video data of one frame to the frame memory 2 based on the horizontal synchronization signal and the vertical synchronization signal, and the video based on the shape information from the shape recognition unit MR. Video processing in the processing memory 3, video data writing control from the video processing memory 3 to the line buffer memory 4, and control for sequentially outputting video data from the line buffer memory 4 to the modulator 6 in units of one pixel. Do. Here, in the video data stored in the live buffer memory 4, the R color component is output to the modulator 6r, the G color component is output to the modulator 6g, and the B color component is output to the modulator 6b. The component is output to the modulator 6IR.

  Specifically, the display controller 5 stores the main video data for one frame in the frame memory 2 when a vertical synchronization signal is input from the synchronization signal output unit 120. Further, the first line of the stored sub-picture data is stored in the line buffer memory 4. Then, the sub-picture data stored in the line buffer memory 4 is sequentially output to the modulator 6 in units of one pixel.

  When the horizontal synchronization signal is input, the sub-video data for the next line is stored in the line buffer memory 4, and the sub-video data for the next line is sequentially stored in units of one pixel from the line buffer memory 4. The signal is output to the modulator 6. As a result, the three-dimensional object OBJ is raster-scanned with the laser beam whose intensity is modulated with the main video data, and the main video is displayed. When raster scanning is performed to the lower right of the screen, the laser beam is returned to the upper left of the screen again. In the meantime, new video data is read into the frame buffer 2 and preparation for displaying the next video is made as described above. By repeating the above, a plurality of images can be displayed.

  The modulator 6 (6r, 6g, 6b, 6IR) uses the R, G, B, IR (infrared) components of the video data sequentially output from the line buffer memory 4 in units of one pixel, respectively. Modulates the intensity of the R, G, B, and infrared laser beams emitted from 7r, 7g, 7b, and 7IR.

  The laser light sources 7r, 7g, 7b, and 7IR are constituted by, for example, laser diodes, and emit red (R), green (G), blue (B), and infrared laser beams, respectively. The collimators CLr, CLg, CLb, and CLIR convert red (R), green (G), blue (B), and infrared laser beams into parallel beams. The laser light sources 7r, 7g, and 7b constitute a visible light projection unit, and the laser light source 7IR constitutes an invisible light projection unit.

  The dichroic mirror 8 (8r, 8g, 8b, 8IR) combines the laser beams emitted from the laser light sources 7r, 7g, 7b, 7IR into a single laser beam W. The detector PD has a detection surface and detects a part of the laser beam W reflected by the half mirror HF.

  The optical scanner 9 is constituted by a two-dimensional optical scanner, for example, and scans the laser beam W two-dimensionally (raster scanning) based on the horizontal synchronization signal and the vertical synchronization signal, and displays an image on the three-dimensional object OBJ. The three-dimensional object OBJ is projected with a laser beam W that is raster-scanned to display an image.

  The detector PD also has a function of monitoring the intensity of the laser beam emitted from each of the laser light sources 7r, 7g, and 7b and outputting a monitor signal to the modulators 6r, 6g, and 6b. The modulators 6r, 6g, and 6b perform APC (auto power control) control of the laser light sources 7r, 7g, and 7b from the monitor signal so that the time average value of the intensity of the laser beam becomes a predetermined value. Thereby, the oscillation intensity of the laser beam is stabilized and the laser light source 7 is prevented from being damaged.

  The position detection unit (PR) 12 as a sensor is configured by a photo reflector including a light emitting element such as an infrared light emitting diode and a light receiving element such as a phototransistor. 16 (see FIG. 3), the reflected light is detected by the light receiving element, and a detection signal indicating the horizontal and vertical inclination angles of the mirror unit 16 is output to the system controller 14 and the phase detection unit 110. The position detector 12 may be of a type that measures the resistance of a piezoelectric element (piezo) of the optical scanner 9.

  When the main video is not displayed, the system controller 14 instructs the display controller 5 to display a black video that does not display the video. Further, the system controller 14 outputs a drive signal to the optical scanner 9 via the driver 13.

  The phase detection unit 110 detects the horizontal and vertical tilt angles of the mirror unit 16 using the detection signal detected by the position detection unit 12.

  The synchronization signal output unit 120 outputs a horizontal synchronization signal and a vertical synchronization signal to the display controller 5 based on the tilt angle of the mirror unit 16 detected by the phase detection unit 110. Here, the synchronization signal output unit 120 may output a horizontal synchronization signal when the horizontal inclination angle detected by the phase detection unit 110 becomes an angle at which scanning of one line starts. In addition, the synchronization signal output unit 120 may output a vertical synchronization signal when the phase detection unit 110 sets the vertical inclination angle to the angle at which scanning of the first line of one frame starts.

  The invisible light photographing unit CA is an infrared camera capable of photographing an infrared light image, and photographs an area including the invisible light image projected on the three-dimensional object OBJ that is a screen. The shape recognition unit MR recognizes the deformation and / or the displacement state of the three-dimensional object OBJ placed in the visible light image based on the triangulation principle based on the signal from the invisible light photographing unit CA. The video correction unit IS (display controller 5) corrects the main video data in the video processing memory 3 based on the recognition result of the shape recognition unit MR.

  In addition, the infrared light image projected on the three-dimensional object OBJ is imaged by the imaging element of the invisible light photographing unit CA by the technique using triangulation disclosed in Japanese Patent Application Laid-Open No. 2003-346130 and the like. The distance from the video projection system PS to the three-dimensional object OBJ can be obtained.

  Next, the operation of the optical scanner 9 will be described. FIG. 3 is a plan view showing a detailed configuration of the optical scanner 9. The optical scanner 9 includes a two-dimensional scanning mirror 15, a fixed frame 70 that fixes the two-dimensional scanning mirror 15, a movable frame 30 that is formed as a movable part inside the fixed frame 70, and a movable frame 30. And a square-shaped mirror portion 16 formed inside.

  The mirror unit 16 is elastically supported by the movable frame 30 from both sides in the Y-axis direction via torsion bars 21 and 22 that extend outward along the Y-axis passing through the center of the mirror unit 16. In addition, the movable frame 30 is bent beams 41, 42, 43, 44 having one end connected to each of the end portions 30a, 30b, 30c, 30d in the vicinity of the X axis that are orthogonal to the Y axis and pass through the center of the mirror portion 16. Thus, the fixing frame 70 is elastically supported from both sides of the X axis. The fixed frame 70, the bending beams 41 to 44, the movable frame 30, the mirror portion 16, and the torsion bars 21 and 22 are integrally formed by anisotropic etching of the silicon substrate.

  In addition, a reflection film made of a metal thin film such as gold or aluminum is formed on the surface of the mirror portion 16, and the reflectance of incident light is increased. In addition, piezoelectric elements 51, 52, 53, and 54, which are electro-mechanical conversion elements, are attached to the surfaces of the bending beams 41, 42, 43, and 44 by bonding or the like, and the four unimorph portions 61, 62, 63, 64 is formed. The bending beams 41 to 44 cause tilting torque to act independently on the movable frame 30 around the Y axis and the X axis by bending deformation of the piezoelectric elements 51 to 54, and rotate the movable frame 30 about the Y axis and the X axis. Move.

  Here, the rotation operation of the movable frame 30 will be described with reference to FIG. 4A to 4E are cross-sectional views of the two-dimensional scanning mirror 15 in the IV-IV direction of FIG. 4A shows a stationary state, and FIGS. 4B to 4E show a driving state.

  As shown in FIG. 4 (a), upper and lower (+) electrodes 511 and 521 and lower minus (−) electrodes 512 and 522 are provided on the front and back sides of the piezoelectric elements 51 and 52, respectively. By applying an AC voltage between the electrode 511 (521) and the lower (−) electrode 512 (522) in a range that does not cause polarization reversal, the piezoelectric elements 51 and 52 are expanded and contracted, and the unimorph portions 61 and 62 are thickened. Displace in the direction. Similarly, upper (+) electrodes 531 and 541 (not shown) and lower (−) electrodes 532 and 542 (not shown) are provided on the front and back surfaces of the piezoelectric elements 53 and 54, respectively.

  First, the rotation operation around the X axis will be described. When a voltage in the direction in which the driver 13 extends to the piezoelectric element 51 is applied and a voltage in a direction in which the phase opposite to that of the piezoelectric element 51 is contracted is applied to the piezoelectric element 52, one end of each of the unimorph portions 61 and 62 is fixed and held on the fixed frame 70. Therefore, as shown in FIG. 4B, the unimorph portion 61 bends downward, while the unimorph portion 62 bends upward. Similarly, when voltages having the same phase as the piezoelectric elements 51 and 52 are applied to the piezoelectric elements 53 and 54, the unimorph part 63 bends downward, while the unimorph part 64 bends upward.

  As a result, tilting torque about the X axis acts on the movable frame 30, and the movable frame 30 tilts in the direction of arrow P about the X axis. Further, when a voltage having a phase opposite to that in the case of FIG. 4B is applied to the piezoelectric elements 51 to 54, the movable frame 30 has an X axis as shown in FIG. Tilt torque about the X axis acts and tilts in the direction of arrow Q about the X axis. When an AC voltage that maintains such a phase relationship is applied to the piezoelectric elements 51 to 54, the unimorph parts 61 to 64 follow the AC voltage and repeat vertical vibrations so that the movable frame 30 tilts like a seesaw. Torque is applied, and the movable frame 30 rotates and vibrates up to a predetermined displacement angle about the X axis.

  Next, the rotation operation around the Y axis will be described. When the driver 13 applies a voltage extending in either direction to the piezoelectric elements 51 and 52, one end of each of the unimorph portions 61 and 62 is fixed and held by the fixed frame 70, and therefore, as shown in FIG. As you can see, they all turn downward. On the other hand, when a voltage in the direction in which the phase opposite to that of the piezoelectric elements 51 and 52 contracts is applied to the piezoelectric elements 53 and 54, as shown in FIG. Thereby, a tilting torque about the Y axis acts on the movable frame 30, and the movable frame 30 tilts about the Y axis.

  When an AC voltage that maintains such a phase relationship is applied to the piezoelectric elements 51 to 54, the unimorph parts 61 to 64 follow the AC voltage and repeat vertical vibrations so that the movable frame 30 tilts like a seesaw. Torque acts, and the movable frame 30 rotates and vibrates up to a predetermined displacement angle around the Y axis.

  In this way, by applying predetermined voltages from the driver 13 to the four unimorph parts 61 to 64, the inclination of the mirror part 16 supported by the movable frame 30 around the X axis and the Y axis is arbitrarily controlled. be able to. Further, the bending beams 41 to 44 are arranged symmetrically across the Y axis and the X axis, and the piezoelectric elements 51 to 54 provided on the bending beams 41 to 44 have the same phase or opposite phases that are 180 degrees different from each other. Since it is driven by the drive signal, the movable frame 30 can be independently rotated about the Y axis and the X axis without any swing.

  Next, a method for deflecting the laser beam W using the two-dimensional scanning mirror 15 will be described with reference to FIG. The laser beam W emitted from the laser light source 7 is raster scanned by the two-dimensional scanning mirror 15 to generate an image.

  Here, the horizontal scanning frequency is, for example, 30 kHz, and the vertical scanning frequency is, for example, about 60 Hz. Further, the horizontal and vertical inclination angles of the mirror section 16 are each about ± 10 degrees. Further, since the horizontal scanning of the mirror unit 16 performs mechanical resonance vibration using a sinusoidal drive voltage, the horizontal scanning speed is extremely reduced in the left and right peripheral portions of the horizontal scanning region. Therefore, as shown in FIG. 5, the horizontal area of the video display area 17 is a slightly inner area without using the entire scanning area 18.

  Next, the operation of the video projection system PS will be described. When the power is turned on, the system controller 14 instructs the display controller 5 to output black video data to the line buffer memory 4.

  As described above, video data is written to the line buffer memory 4 in accordance with the input video data.

  The modulator 6 oscillates the laser light source 7, reads video data from the line buffer memory 4 in units of pixels, and modulates the laser beam emitted from the laser light source 7 using the read video data.

  The three laser beams emitted from the laser light source 7 are combined into one laser beam W by the dichroic mirror 8 and enter the mirror unit 16.

  The laser beam W is raster-scanned by the scanning-driven mirror unit 16 and projected onto the three-dimensional object OBJ, thereby forming a high-definition image. At this time, the infrared light image is projected onto the three-dimensional object OBJ so as to be superimposed on the visible light image, but the observer does not notice it.

  Hereinafter, the image correction mode will be described based on the flowchart of FIG. 6 with the three-dimensional object OBJ as a rectangular parallelepiped. First, in step S101, the shape recognizing unit MR performs the rectangular parallelepiped OBJ according to the principle of triangulation based on the signal from the invisible light photographing unit CA that has photographed the region including the invisible light image projected on the surface of the three-dimensional object OBJ. Get shape information. Here, the shape information is, for example, the rotation angle of the rectangular parallelepiped OBJ.

  FIG. 7 is a view of the rectangular parallelepiped OBJ as viewed from directly above, and the rotation angle about the central axis X of the rectangular parallelepiped OBJ is defined as θ. The inclination of the projection surface SC1 (SC2) of the cuboid OBJ changes depending on the rotation angle θ. In step S102, the video correction unit IS corrects the visible light video based on the shape information.

  More specifically, the shape recognition unit MR first detects whether there is an edge ED (boundary between surfaces) in the imaged surface based on a signal from the invisible light imaging unit CA. Edge detection scans the entire screen by scanning infrared light horizontally with respect to the three-dimensional object OBJ and obtaining the closest pixel in the column when the distance is measured for each pixel. . At this time, if adjacent pixels are arranged vertically, this can be detected as an edge. Here, when there is no edge as shown by a dotted line in FIG. 7, the video correction unit IS can determine that the projection plane is not inclined based on the signal from the invisible light photographing unit CA. Does not correct the video data.

  On the other hand, when the shape recognition unit MR detects that there is an edge ED within the photographed surface, the image correction unit IS recognizes that there are two projection surfaces and projects different images on the two surfaces SC1 and SC2. A signal is output to the video correction unit IS. In such a case, since the projection surfaces SC1 and SC2 are inclined in different directions, affine transformation and trapezoidal correction (with respect to different video data based on signals from the invisible light photographing unit CA according to the inclination angles ( Japanese Patent Laid-Open No. 2010-130181). At this time, the conversion coefficient of the affine transformation is changed according to the inclination angle θ. Thereafter, in step S103, the visible light image is corrected by the visible light projection unit PJ1. Accordingly, by appropriately projecting the corrected image on each of the projection surfaces SC1 and SC2, the observer can naturally observe the image in perspective.

  As is clear from the above, the edge ED in the captured screen represents the boundary of the projection surface, and the projection image is tracked by the detection, and different images are displayed on both sides of the edge ED. . That is, as shown in FIG. 8, when projection is performed on the rectangular parallelepiped OBJ by the video projection system PS of the present embodiment, in the state (a) where the first projection plane SC1 faces the observer, The first image IMG1 is projected without being corrected on the entire projection surface SC1. From here, as the cuboid OBJ is rotated, the edge ED starts to be detected, and the image IMG1 on the first projection surface SC1 follows and is corrected while becoming narrower. The next image IMG2 is corrected and projected onto the second projection surface SC2 entering the field of view ((b) to (d)). With the rotation of the rectangular parallelepiped OBJ, the width of the next image IMG2 on the second projection plane SC2 increases ((e), (f)), and the edge ED is detected when the rectangular parallelepiped OBJ further rotates 90 degrees. Since the second projection plane SC2 faces the viewer (g), the first image IMG1 disappears and the uncorrected image IMG2 is projected on the entire second projection plane SC2. Become. In other words, by continuously rotating the rectangular parallelepiped OBJ, different images are formed one after another at every rotation angle of 90 degrees on each surface of the rectangular parallelepiped OBJ where no image is formed, like an automatic picture-story show. Effects can be obtained.

  In particular, in the example of FIG. 9, when the cuboid OBJ is rotated by hand, an independent image is projected on the side surface of the cuboid OBJ according to the rotation. Four types of images are prepared for each side of the rectangular parallelepiped OBJ. If the image is projected as it is to the rectangular parallelepiped OBJ, the image is distorted, and the image correction unit corrects the image so that it looks natural to the observer.

  Note that when an image is projected onto a three-dimensional object using a normal image projection system using an LED light source or the like, an image that is in focus at all points on the three-dimensional object cannot be projected. Then, by using a laser light source as the light source, focus-free is realized regardless of the distance, and a focused image can be projected at any position of the three-dimensional object. Such an effect can be obtained with an image projection system having a certain depth of focus, but an image projection system using a laser light source as in this embodiment is particularly preferred.

2 frame memory 3 image processing memory 4 line buffer memory 6, 6r, 6g, 6b, 6IR modulator 7, 7r, 7g, 7b, 7IR laser light source 8, 8r, 8g, 8b, 8IR dichroic mirror 9 optical scanner 10 screen 12 Position detection unit 14 System controller 15 Two-dimensional scanning mirror 16 Mirror unit 17 Video display region 18 Scanning region 110 Phase detection unit 120 Synchronization signal output unit CA Invisible light imaging unit IS Video correction unit MR Shape recognition unit OBJ Three-dimensional object PJ1 Visible light Projection unit PJ2 Invisible light projection unit PS Image projection system

Claims (5)

An image projection system that projects an image on a three-dimensional object,
A visible light projection unit that projects a visible light image onto the three-dimensional object;
An invisible light projection unit that projects an invisible light image superimposed on the visible light image;
An invisible light photographing unit for photographing an area including the invisible light image;
A shape recognition unit for recognizing deformation and / or displacement state of the three-dimensional object placed in the visible light image based on a signal from the invisible light photographing unit;
An image projection system comprising: an image correction unit that corrects the visible light image based on a recognition result of the shape recognition unit.   The video projection system according to claim 1, wherein the three-dimensional object is deformed and / or displaced over time.   3. The visible light projection unit projects an image by scanning outgoing light, and the shape recognition unit performs shape recognition using acquisition of distance information by triangulation. Video projection system.   The three-dimensional object is a polyhedron, the shape recognition unit recognizes the surface of the polyhedron based on a signal from the invisible light photographing unit, and the video correction unit is based on a recognition result of the shape recognition unit, 4. The image projection system according to claim 1, wherein the visible light image is corrected so that an independent image is obtained for each surface of the polyhedron.   5. The video projection system according to claim 4, wherein the polyhedron is a rectangular parallelepiped.