JP2013145949A - Projection system, and alignment adjusting method for superposed image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection system able to use a capture camera that does not require high resolution and able to highly accurately adjust the alignment of superposed images by simple signal processing.SOLUTION: A photographing device photographs a range where projection images are superposed and projected. Two photographing devises are provided, one of which photographs the left lower corner of the superposed image and the other photographs the right lower corner. Each photographing range includes test patterns displayed on two corresponding images. The control device determines adjustment information from the amount of displacement between the test patterns. Based on adjustment information, the control device instructs a projector to adjust the zooming position of a projection lens. After an amount of zoom is adjusted, a control device instructs the projector to adjust a difference between projecting positions (the adjustment of the horizontal position of a projection image and the adjustment of the vertical position of the projection image).

Description

  The present technology relates to a projection system and a method for adjusting image alignment of a superimposed image.

  In order to display a stereoscopic image and a high-definition image, images projected by a plurality of projection devices are superimposed on one screen. For example, in recent years, movies that can observe stereoscopic images have been widely screened in movie theaters and the like. In such a movie theater, an image for left eye observation and an image for right eye observation are displayed on one screen. The audience wears glasses for stereoscopic viewing, separates the image displayed on one screen into an image for left eye observation and an image for right eye observation, and the left eye image with the left eye. The right eye image is observed with the right eye.

  In such superposition of a plurality of images on one screen, the quality of the video is deteriorated if the zoom amount of each image or the accuracy of the projection position is poor. Even in the case of displaying a high-definition image superimposed on one screen, the reduction in the image overlay accuracy is the same as the reduction in the image overlay accuracy.

  In recent movie theaters, there is an example of creating a program for screening different works by changing customers, in which case the aspect ratio of the screen may be changed. The screen aspect ratio is changed by changing the zoom amount of the projection apparatus, and is accompanied by driving of a projection lens which is a mechanical element.

  For this reason, the movie theater may be required to adjust the image alignment every time the aspect ratio of the screen is changed. Several proposals have been made for a method for adjusting the overlay of images.

JP 2008-219190 A JP 2000-147694 A Japanese Patent Laid-Open No. 08-168039 Japanese Patent Laid-Open No. 06-070328 Japanese Patent Application Laid-Open No. 08-201937

  However, in many of the adjustment methods when superimposing images, it is common to use a capture camera to capture the entire screen and then perform image alignment of the image projected by the projection device by signal processing. It is.

  At this time, the capture camera is required to have a higher resolution than the image to be projected, and the cost of the image matching adjustment system is increased. Further, many of the adjustment methods for superimposing images are complicated in signal processing for performing image matching, and are required to be simplified.

  The present technology has been made in view of such a point, and can use a capture camera that does not require high resolution, and can perform adjustment of superimposed image alignment with simple signal processing. It is an object of the present invention to provide a projection system that can be performed well and a method for adjusting the alignment of superimposed images.

  In order to solve the above problems, a projection system includes a first projection device, a second projection device, a first imaging device, a second imaging device, and a control device. The first projection device projects the first image. The second projection device projects the second image. The first imaging device captures a first corner of the superimposed image in which the first image and the second image are superimposed. The second imaging device captures the second corner of the superimposed image. The control device includes a zoom amount control unit and a projection position control unit, and images of the first image and the second image are obtained from the captured image of the first corner and the captured image of the second corner. Control alignment.

  The zoom amount control unit is configured to detect a zoom error between a zoom amount of the lens of the first projection device and a zoom amount of the lens of the second projection device from the captured image of the first corner and the captured image of the second corner. And the zoom adjustment amount based on the zoom error is instructed to the first projection apparatus and the second projection apparatus. The projection position control unit is configured to calculate the projection position of the first projection device and the second projection from the captured image of the first corner after adjusting the zoom amount and the captured image of the second corner after adjusting the zoom amount. A projection position error with respect to the projection position of the apparatus is detected, and an adjustment amount of the projection position based on the projection position error is instructed to the first projection apparatus and the second projection apparatus.

  In order to solve the above problem, a projection system includes a first projection device, a second projection device, a first imaging device, a second imaging device, a third imaging device, and a control. An apparatus. The first projection device projects the first image. The second projection device projects the second image. The first imaging device captures a first corner of the superimposed image in which the first image and the second image are superimposed. The second imaging device captures the second corner of the superimposed image. The third imaging device captures an intermediate portion of the superimposed image. The control device includes a zoom amount control unit and a projection position control unit, and the first image is obtained from the captured image of the first corner, the captured image of the second corner, and the captured image of the intermediate portion. Controls the alignment of the second image.

  The zoom amount control unit is configured to detect a zoom error between a zoom amount of the lens of the first projection device and a zoom amount of the lens of the second projection device from the captured image of the first corner and the captured image of the second corner. And the zoom adjustment amount based on the zoom error is instructed to the first projection apparatus and the second projection apparatus. The projection position control unit detects a projection position error between the projection position of the first projection apparatus and the projection position of the second projection apparatus from the captured image of the intermediate part after adjusting the zoom amount, and based on the projection position error. The adjustment amount of the projection position is instructed to the first projection device and the second projection device.

  In addition, in order to solve the above-described problem, the adjustment method of the superposition image of the first image projected by the first projection device and the second image projected by the second projection device is a superimposed image. A first projection device based on a step of photographing the first corner, a step of photographing the second corner of the superimposed image, a photographed image of the first corner, and a photographed image of the second corner. Detecting a zoom error between the zoom amount of the first lens and the zoom amount of the lens of the second projector, adjusting the zoom amount of the lens of the first projector according to the zoom error, and following the zoom error. A step of executing at least one of the adjustments of the zoom amount of the lens of the second projection device, a captured image of the first corner after adjustment of the zoom amount, and a second corner after adjustment of the zoom amount; From the captured image, the projection position of the first projection device and the second Detecting a projection position error with respect to the projection position of the shadow apparatus; adjusting the projection position of the first projection apparatus according to the projection position error; and adjusting the projection position of the second projection apparatus according to the projection position error And executing at least one of them.

  According to the projection system and the adjustment method of the superimposition image matching, it is possible to use a capture camera that does not require high resolution, and the superimposition image adjustment can be adjusted by simple signal processing. It can be done accurately.

It is a figure which shows the structural example of the projection system of 1st Embodiment. It is a figure which shows the example of a display of the test pattern in the superimposed image of 1st Embodiment, and an example of an imaging | photography range. It is a figure which shows an example of the picked-up image of the test pattern of 1st Embodiment. It is a figure which shows an example of the picked-up image of the test pattern of 1st Embodiment. It is a figure which shows the flowchart of the image matching adjustment process of 1st Embodiment. It is a figure which shows the flowchart of the zoom adjustment process of 1st Embodiment. It is a figure which shows the flowchart of the deviation | shift amount detection process of 1st Embodiment. It is a figure which shows the flowchart of the projection position adjustment process of 1st Embodiment. It is a figure which shows an example of the hardware constitutions of the control apparatus of 1st Embodiment. It is a figure which shows an example of a structure of the projector of 1st Embodiment, and a connection with an external device. It is a figure which shows the display of the test pattern in the superimposed image of 1st Embodiment, and the modification of an imaging range. It is a figure which shows an example of the imaging | photography range of the imaging device in the projection system of 2nd Embodiment.

  Hereinafter, embodiments of the present technology will be described in detail with reference to the drawings.

[First Embodiment]
First, the projection system of the first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration example of a projection system according to the first embodiment.

  The projection system 1 adjusts the image alignment of two superimposed images (superimposed images) when projecting two images superimposed on one screen. The projection system 1 is used in, for example, a movie theater that displays an image on a screen.

  The two images that are superimposed and projected on one screen may be any image that is displayed as a single image in a superimposed manner. For example, the two images projected in a superimposed manner are a left-eye image and a right-eye image when a stereoscopic image is displayed. In addition, the two images projected in a superimposed manner may be an image that improves resolution by being combined, an image that displays different contents such as video and subtitles, or a map and characters.

  The projection system 1 includes a control device 2, a projector (first projection device) 5, a projector (second projection device) 8, an imaging device (first imaging device) 15, and an imaging device (second imaging device). Imaging device) 16.

  The projector 5 is a projection device that projects a projection image (first image) 11 on a screen. The projector 8 is a projection device that projects a projection image (second image) 12 on a screen. The projected image 11 and the projected image 12 are projected on one screen.

  The projector 5 can project a projected image 11 including a plurality of test patterns. The test pattern included in the projection image 11 is displayed at the corner of the projection image 11 (the image periphery including the four sides and the square). For example, the test pattern included in the projection image 11 includes an imaging range 13 in the lower left corner (first corner) of the projection image 11 and an imaging in the lower right corner (second corner) of the projection image 11. They are displayed at positions corresponding to the range 14, respectively.

  The projector 8 can project the projected image 12 including a plurality of test patterns. The test patterns included in the projection image 12 are displayed at the corners of the projection image 12 (image edges including four sides and squares). For example, the test pattern included in the projection image 12 is displayed at a position corresponding to the shooting range 13 at the lower left corner of the projection image 12 and the shooting range 14 at the lower right corner of the projection image 12.

  The test pattern included in the projection image 11 and the test pattern included in the projection image 12 are the zoom adjustment and the projection position adjustment of both the projection image 11 and the projection image 12 or one of the projection image 11 and the projection image 12. It can be used to determine the amount of adjustment when performing. Details of the test pattern will be described later with reference to FIGS.

  The imaging device 15 is an imaging device that captures an imaging range 13 that includes an area where the projection image 11 and the projection image 12 are superimposed and projected. The imaging device 16 is an imaging device that captures an imaging range 14 that includes an area where the projection image 11 and the projection image 12 are superimposed and projected. The imaging devices 15 and 16 set different corners of the projected image 11 and the projected image 12 as shooting ranges. For example, the imaging device 15 sets the imaging range 13 positioned at the lower left corner of the projected image 11 and the projected image 12 as an imaging range, and the imaging device 16 sets the imaging range positioned at the lower right corner of the projected image 11 and the projected image 12. 14 is an imaging range.

  Thereby, the imaging device 15 includes the test pattern included in the projection image 11 and the test pattern included in the projection image 12 in the imaging range 13. The imaging device 16 includes a test pattern included in the projection image 11 and a test pattern included in the projection image 12 in the imaging range 14.

  The photographing devices 15 and 16 each output a photographed image (image information) to the control device 2.

  Note that the imaging devices 15 and 16 do not capture the entire video content (for example, a movie) by setting a part of the projection images 11 and 12 as the imaging range and not the entire imaging range. ing. Since the imaging devices 15 and 16 do not set the entire projection images 11 and 12 as the imaging range, the projection system 1 can install the imaging devices 15 and 16 at positions close to the screen. Further, the projection system 1 lowers the resolution of the imaging devices 15 and 16 than the projectors 5 and 8, so that the entire projection images 11 and 12 can be captured even if the installation positions of the imaging devices 15 and 16 are changed. It is possible to prevent high quality capture. Thereby, the projection system 1 prevents the photographing apparatuses 15 and 16 from functioning as a video content duplicating device.

  The projector 5 includes a zoom adjustment unit 6 and a projection position adjustment unit 7. The zoom adjustment unit 6 performs zoom adjustment of the projection image 11 by driving a projection lens (not shown) based on the adjustment information instructed from the control device 2. The projection position adjustment unit 7 adjusts the image center position of the projection image 11 by signal processing based on the adjustment information instructed from the control device 2.

  The projector 8 includes a zoom adjustment unit 9 and a projection position adjustment unit 10. The zoom adjustment unit 9 adjusts the zoom of the projection image 12 by driving a projection lens (not shown) based on the adjustment information instructed from the control device 2. The projection position adjustment unit 10 adjusts the image center position (image projection position) of the projection image 12 by signal processing based on the adjustment information instructed from the control device 2.

  The adjustment information includes information for adjusting the zoom position of the projection lens and information for adjusting the image center position of the projection image. Information for adjusting the zoom position of the projection lens includes, for example, information for specifying the zoom position and information for specifying the adjustment amount from the current zoom position. Information for adjusting the image center position of the projected image includes, for example, information for specifying the image center position, information for specifying an adjustment amount from the current image center position, and the like. Note that the adjustment of the image center position can be performed by adjusting the horizontal position of the projection image and adjusting the vertical position of the projection image.

  The control device 2 controls image matching between the projection image 11 and the projection image 12. The control device 2 determines adjustment information from the image information input from the imaging device 15 and the image information input from the imaging device 16. Based on the adjustment information, the control device 2 instructs both or one of the projectors 5 and 8 to adjust the zoom position of the projection lens and to adjust the image center position of the projection image.

  The control device 2 includes a zoom amount control unit 3 and a projection position control unit 4. The zoom amount control unit 3 detects an error (zoom error) between the zoom amount of the projection lens of the projector 5 and the zoom amount of the projection lens of the projector 8 from the photographed image of the photographing range 13 and the photographed image of the photographing range 14. . Based on the detected zoom error, the zoom amount control unit 3 instructs at least one of the projector 5 and the projector 8 to adjust the zoom amount of the projection lens.

  The projection position control unit 4 calculates an error (projection) between the projection position of the projector 5 and the projection position of the projector 8 from the photographed image of the photographing range 13 after adjusting the zoom amount and the photographed image of the photographing range 14 after adjusting the zoom amount. Position error) is detected. The projection position control unit 4 instructs the projector 5 or the projector 8 to adjust the projection position error based on the detected projection position error.

  As described above, the projection system 1 adjusts the size of the projection image 11 and the size of the projection image 12 (zoom adjustment) before adjusting the projection position error, thereby generating a mechanism generated when the projection lens is driven. The mechanism error is converged. Thereby, the projection system 1 prevents the adjustment from being converged again by causing the projection position error again by driving the projection lens after the adjustment of the projection position error.

  Then, the projection system 1 can perform image matching efficiently by performing two-stage adjustment of adjusting the projection position error after adjusting the size of the projection image 11 and the size of the projection image 12. ing.

  In addition, a corner part contains the peripheral part used as the non-conspicuous part (one corner) away from the center part. By setting the corners to the four corners when the projection area is rectangular, the distance between the center and the corner can be increased, and the adjustment amount (lens zoom adjustment amount, projection position adjustment amount) detection accuracy Contributes to improvement.

  Next, the test pattern in the superimposed image, the shooting range of the superimposed image, and the shot image in the shooting range of the first embodiment will be described with reference to FIGS. FIG. 2 is a diagram illustrating a display example of a test pattern in a superimposed image and an example of a captured image according to the first embodiment. 3 and 4 are diagrams illustrating an example of a captured image of the test pattern according to the first embodiment.

  The superimposed image 20 is an image in which the projection image 11 and the projection image 12 are superimposed (image matching). Here, the vertical direction of the drawing is the vertical direction of the superimposed image 20, and the horizontal direction of the drawing is the horizontal direction of the superimposed image 20.

  A test pattern (first test pattern) 23 of the projection image 11 and a test pattern (second test pattern) 22 of the projection image 12 are located at the lower left corner of the superimposed image 20. The test pattern 23 has an L shape in which a straight line portion 38 made of a horizontal line and a straight line portion 30 made of a vertical line are connected at a connection point 35. The test pattern 23 is arranged with the direction of the corner (connection point 35) of the test pattern 23 and the direction of the corresponding corner of the superimposed image 20 being the same. In other words, the test pattern 23 is the base of the superimposed image 20, the straight line portion 38 is disposed in the vicinity of the base 25 of the superimposed image forming the periphery of the superimposed image 20, and the left side of the superimposed image 20. The straight line portion 30 is disposed in the vicinity of the left side 24 of the superimposed image that forms the periphery of 20.

  The test pattern 22 has an L shape in which a straight line portion 39 made of a horizontal line and a straight line portion 31 made of a vertical line are connected at a connection point 34. The test pattern 22 is arranged such that the direction of the corner (connection point 34) of the test pattern 22 is the same as the direction of the corresponding corner of the superimposed image 20. In other words, the test pattern 22 is the base of the superimposed image 20, the straight line portion 39 is disposed in the vicinity of the base 25 of the superimposed image forming the periphery of the superimposed image 20, and the left side of the superimposed image 20. A straight line portion 31 is arranged in the vicinity of the left side 24 of the superimposed image forming the 20 peripheral edges.

  A test pattern (third test pattern) 27 of the projection image 11 and a test pattern (fourth test pattern) 28 of the projection image 12 are located at the lower right corner of the superimposed image 20. The test pattern 27 has an L shape in which a straight line portion 41 made of a horizontal line and a straight line portion 49 made of a vertical line are connected at a connection point 46. The test pattern 27 is arranged such that the direction of the corner (connection point 46) of the test pattern 27 and the direction of the corresponding corner of the superimposed image 20 are the same. In other words, the test pattern 27 is the base of the superimposed image 20, the straight line portion 41 is disposed in the vicinity of the base 25 of the superimposed image that forms the periphery of the superimposed image 20, and the right side of the superimposed image 20. A straight line portion 49 is disposed in the vicinity of the right side 26 of the superimposed image forming the 20 peripheral edges.

  The test pattern 28 has an L shape in which a straight line portion 42 made of a horizontal line and a straight line portion 50 made of a vertical line are connected at a connection point 45. The test pattern 28 is arranged with the direction of the corner (connection point 45) of the test pattern 28 and the direction of the corresponding corner of the superimposed image 20 being the same. In other words, the test pattern 28 is the base of the superimposed image 20, the linear portion 42 is disposed in the vicinity of the base 25 of the superimposed image forming the periphery of the superimposed image 20, and the right side of the superimposed image 20. A straight line portion 50 is arranged in the vicinity of the right side 26 of the superimposed image forming the 20 peripheral edges.

  Note that the test pattern 22 and the test pattern 23 have display modes that can be identified by image analysis. Display modes that can be identified by image analysis may include characters, symbols, and the like in addition to distinction by color, shape, shape, and size. For example, the test pattern 22 and the test pattern 23 or the test pattern 27 and the test pattern 28 can be distinguished from each other by displaying the test patterns 23 and 27 in green and the test patterns 22 and 28 in red. May be.

  As described above, since the imaging ranges 13 and 14 are limited to a part of the projection images 11 and 12, the size of the test pattern can be made sufficiently smaller than the projection images 11 and 12. The direction of the L-shaped test pattern is arranged so that the direction of the corner and the direction of the corresponding corner of the superimposed image 20 are the same, and the display area occupied in the projected images 11 and 12 is sufficiently small. can do. Thereby, the projection system 1 can reduce the attention to the test pattern from the observer when there is an observer (for example, a movie spectator) of the superimposed image 20, and the test generated from the presence of the observer. The restriction on the display timing of the pattern can be reduced.

  The shooting range 13 is a range shot by the shooting device 15, and the test patterns 22 and 23 at the lower left corner of the superimposed image 20 are included in the shooting range 13. The imaging range 13 is a rectangle, and is inclined with respect to the rectangular superimposed image 20 by a predetermined angle α (for example, 45 degrees to the left). The tilt of the shooting range 13 can be realized by tilting the shooting device 15. That is, the imaging device 15 is installed in a direction in which the vertical line of the captured image 21 faces the center of the superimposed image 20.

  The shooting range 14 is a range shot by the shooting device 16, and the test patterns 27 and 28 at the lower right corner of the superimposed image 20 are included in the shooting range 14. The shooting range 14 is rectangular, and is disposed so as to be inclined by a predetermined angle β (for example, 45 degrees to the right) with respect to the rectangular superimposed image 20. The inclination of the imaging range 14 can be realized by installing the imaging device 16 at an angle. That is, the imaging device 16 is installed in a direction in which the vertical line of the captured image 29 faces the center of the superimposed image 20.

  It should be noted that the inclination of the shooting range 13 is four intersections (intersection points) 32 and 33 when the test patterns 22 and 23 are scanned in the horizontal direction of the captured image 21 (different from the horizontal direction of the superimposed image 20) with the scan line 40. , 36, 37 is desirable. Similarly, when the test pattern 27, 28 is scanned with the scan line 51 in the horizontal direction of the captured image 29 (different from the horizontal direction of the superimposed image 20), the inclination of the imaging range 14 is four intersections (intersections) 43, It is desirable that the angle obtains 44, 47, and 48.

  The scan line 40 is a scan line scanned by the control device 2 that has input the captured image 21. The control device 2 obtains intersections 32, 33, 36, and 37 by scanning the test patterns 22 and 23 with the scan line 40. The distance between the intersection 32 and the intersection 33 represents the horizontal deviation amount a between the test pattern 22 and the test pattern 23, and the distance between the intersection 36 and the intersection 37 represents the vertical deviation b between the test pattern 22 and the test pattern 23. Represent.

  The scan line 51 is a scan line scanned by the control device 2 that has input the captured image 29. The control device 2 obtains intersections 43, 44, 47, and 48 by scanning the test patterns 27 and 28 with the scan line 51. The distance between the intersection 43 and the intersection 44 represents the horizontal displacement c between the test pattern 27 and the test pattern 28, and the distance between the intersection 47 and the intersection 48 represents the vertical displacement d between the test pattern 27 and the test pattern 28. Represent.

  As described above, the projection system 1 tilts the photographing devices 15 and 16 with respect to the test pattern, so that only one horizontal scan is performed on the photographed images 21 and 29, respectively. It is possible to grasp the image shift between the direction and the vertical direction.

  In addition, the projection system 1 prevents the photographing devices 15 and 16 from functioning as a video content duplicating device also by the relative inclination between the superimposed image 20 and the photographing devices 15 and 16.

  Note that if the test patterns 22 and 23 obtain four intersections (intersection points) 32, 33, 36, and 37 when scanned with the scan line 40 in the horizontal direction of the captured image 21, the respective straight line portions are the same. It may have a predetermined horizontal component and a predetermined vertical component. Similarly, if the test patterns 27 and 28 obtain four intersections (intersection points) 43, 44, 47, and 48 when scanned with the scan line 51 in the horizontal direction of the captured image 29, each straight line portion is obtained. May have a predetermined horizontal component and a predetermined vertical component.

  Next, a method of performing image alignment of the superimposed image 20 based on the amount of deviation of the superimposed image that can be grasped in this way will be described with reference to FIGS. FIG. 5 is a diagram illustrating a flowchart of the image matching adjustment process according to the first embodiment. FIG. 6 is a diagram illustrating a flowchart of zoom adjustment processing according to the first embodiment. FIG. 7 is a diagram illustrating a flowchart of the shift amount detection process according to the first embodiment. FIG. 8 is a flowchart of the projection position adjustment process according to the first embodiment.

  First, the image matching adjustment process executed by the control device 2 will be described. The control device 2 executes an image matching adjustment process when adjusting the image matching of the superimposed image 20. The control device 2 performs predetermined operations such as an operation input for instructing adjustment of image alignment, an event generation timing such as when the projectors 5 and 8 are initialized, when projection by the projectors 5 and 8 is started, and when video content to be projected is switched. The image matching adjustment process can be executed at this timing.

  [Step S11] The control device 2 instructs the projectors 5 and 8 to display a test pattern. Upon receiving the test pattern display instruction from the control device 2, the projector 5 includes the test patterns 23 and 27 in the projected image 11 and performs projection. In response to the test pattern display instruction from the control device 2, the projector 8 includes the test patterns 22 and 28 in the projected image 12 and performs projection.

  [Step S12] The control device 2 executes zoom adjustment processing for adjusting the zoom of the projection lens based on the test pattern displayed by the projectors 5 and 8. Details of the zoom adjustment processing will be described later.

  [Step S13] The control device 2 executes a projection position adjustment process for adjusting the projection position based on the test pattern displayed by the projectors 5 and 8 after the zoom adjustment process. Details of the projection position adjustment processing will be described later.

  [Step S14] The control device 2 instructs the projectors 5 and 8 to clear the test pattern. In response to the test pattern clear instruction from the control device 2, the projector 5 projects the projection image 11 in which the test patterns 23 and 27 are cleared. Upon receiving the test pattern clear instruction from the control device 2, the projector 8 projects the projection image 12 with the test patterns 22 and 28 cleared. After instructing the projectors 5 and 8 to clear the test pattern, the control device 2 ends the image matching adjustment process.

  In this way, the control device 2 adjusts the projection position error after adjusting the zoom of the projection lens for the projectors 5 and 8 to converge the error of the mechanical mechanism that occurs when the projection lens is driven. Thereby, the control apparatus 2 makes it possible to perform the image alignment of the projection system 1 efficiently.

  Next, zoom adjustment processing executed by the control device 2 will be described. The control device 2 executes zoom adjustment processing in step S12 of the image matching adjustment processing.

  [Step S21] The control device 2 executes a shift amount detection process for detecting a shift amount between the projection image 11 and the projection image 12 based on the test pattern displayed by the projectors 5 and 8.

  Here, the shift amount detection process will be described before the description of step S22. In the shift amount detection process, the shift amounts a, b, c, and d described with reference to FIGS. 3 and 4 are detected.

  [Step S <b> 31] The control device 2 acquires the captured image 21 including the test patterns 22 and 23 from the imaging device 15. In addition, the control device 2 acquires the captured image 29 including the test patterns 27 and 28 from the imaging device 16.

  [Step S <b> 32] The control device 2 scans the captured image 21 with the scan line 40.

  [Step S33] The control device 2 identifies intersections 32, 33, 36, and 37 where the scan line 40 and the test patterns 22 and 23 intersect.

  [Step S34] The control device 2 detects the shift amount a from the intersection 32 and the intersection 33. The shift amount a includes the horizontal component error between the projection image 11 and the projection image 12 as information.

  [Step S35] The control device 2 detects the deviation b from the intersection 36 and the intersection 37. The deviation amount b includes the error of the vertical component between the projection image 11 and the projection image 12 as information.

  [Step S <b> 36] The control device 2 scans the captured image 29 with the scan line 51.

  [Step S37] The control device 2 identifies intersections 43, 44, 47, and 48 where the scan line 51 and the test patterns 27 and 28 intersect.

  [Step S38] The control device 2 detects the shift amount c from the intersection 43 and the intersection 44. The shift amount c includes an error of a vertical component between the projection image 11 and the projection image 12 as information.

  [Step S39] The control device 2 detects the shift amount d from the intersection 47 and the intersection 48. The shift amount d includes, as information, an error in the horizontal component between the projection image 11 and the projection image 12.

  The control device 2 detects the shift amounts a, b, c, and d, and ends the shift amount detection process.

  Note that the scan line 40 is a horizontal line of the captured image 21, and the scan line 51 is a horizontal line of the captured image 29. Thus, by setting the scan lines 40 and 51, it becomes easy to detect the shift amounts a, b, c, and d, and the burden on the signal processing of the control device 2 is reduced.

Here, the description returns to the zoom adjustment processing again.
[Step S22] The control device 2 detects a zoom error based on the shift amounts a and d detected by the shift amount detection process. The zoom error can be calculated as a difference (= | ad−d |) between the shift amount a and the shift amount d. The zoom error can also be calculated as a difference (= | b−c |) between the deviation amount b and the deviation amount c detected by the deviation amount detection process.

  [Step S23] The control device 2 determines whether or not the detected zoom error is within a preset allowable range. When the zoom error is within the allowable range, the control device 2 ends the zoom adjustment process without performing zoom adjustment. On the other hand, if the zoom error is not within the allowable range, the control device 2 proceeds to step S24.

  [Step S24] The control device 2 adjusts at least one of the zoom amount of the projection lens of the projector 5 and the zoom amount of the projection lens of the projector 8 based on the calculated zoom error. (Zoom adjustment amount) is calculated. For example, when one of the zoom amounts of the projection lenses of the projectors 5 and 8 is used as a reference, the control device 2 calculates the zoom adjustment amount for the other. Alternatively, the control device 2 calculates the zoom adjustment amount for both the zoom amounts of the projection lenses of the projectors 5 and 8 when there is a separately defined standard.

  [Step S25] The control device 2 instructs the corresponding projector on the calculated zoom adjustment amount. After adjusting the zoom amount of the projection lens of the projectors 5 and 8, the control device 2 returns to step S21. Note that the control device 2 may end the zoom adjustment process when confirmation after adjustment of the zoom amount of the projection lens of the projectors 5 and 8 is not required.

  In this manner, the projection system 1 can adjust the zoom amount of the projection image 11 and the projection image 12 in the superimposed image 20.

  Next, the projection position adjustment process executed by the control device 2 will be described. The control device 2 executes the projection position adjustment process in step S13 of the image matching adjustment process.

  [Step S41] The control device 2 executes a deviation amount detection process. The control device 2 detects the shift amounts a, b, c, and d based on the captured images 21 and 29 after adjusting the zoom amount of the projection lens.

  [Step S42] The control device 2 detects a horizontal projection position error based on the shift amounts a and d detected by the shift amount detection process. The control device 2 can calculate the horizontal projection position error as the sum of the shift amount a and the shift amount d (= a + d).

  [Step S43] The control device 2 determines whether or not the detected horizontal projection position error is within a preset allowable range. The control device 2 proceeds to step S45 when the horizontal projection position error is within the allowable range, and proceeds to step S44 when the horizontal projection position error is not within the allowable range.

  [Step S44] The control device 2 projects at least one of the horizontal projection position of the projection image 11 and the horizontal projection position of the projection image 12 based on the calculated horizontal projection position error. An adjustment amount for adjusting the position (a projection position adjustment amount in the horizontal direction) is calculated. For example, when one of the projection positions of the projection images 11 and 12 is used as a reference, the control device 2 calculates a projection position adjustment amount in the horizontal direction for the other. Alternatively, when there is a separately defined reference, the control device 2 calculates the horizontal projection position adjustment amount for both the projection positions of the projection images 11 and 12.

  [Step S45] The control device 2 detects a projection position error in the vertical direction based on the shift amounts b and c detected by the shift amount detection process. The control device 2 can calculate the vertical projection position error as the sum of the shift amount b and the shift amount c (= b + c).

  [Step S46] The control device 2 determines whether or not the detected vertical projection position error is within a preset allowable range. The control device 2 proceeds to step S48 when the vertical projection position error is within the allowable range, and proceeds to step S47 when the vertical projection position error is not within the allowable range.

  [Step S47] The control device 2 projects at least one of a vertical projection position of the projection image 11 and a vertical projection position of the projection image 12 based on the calculated vertical projection position error. An adjustment amount for adjusting the position (vertical projection position adjustment amount) is calculated. For example, when one of the projection positions of the projection images 11 and 12 is used as a reference, the control device 2 calculates the projection position adjustment amount in the vertical direction for the other. Alternatively, the control device 2 calculates the projection position adjustment amount in the vertical direction for both the projection positions of the projection images 11 and 12 when there is a separately defined reference.

  [Step S48] The control device 2 determines whether or not at least one of the horizontal projection position adjustment amount and the vertical projection position adjustment amount has been calculated for the projection positions of the projection images 11 and 12. . The control device 2 proceeds to step S49 when at least one of the horizontal projection position adjustment amount and the vertical projection position adjustment amount is calculated, and when neither is calculated, the projection position adjustment processing is performed. Exit.

  [Step S49] The control device 2 instructs one or both of the calculated horizontal projection position adjustment amount and vertical projection position adjustment amount to the corresponding projector. After adjusting the projection positions of the projection images 11 and 12, the control device 2 returns to step S41. Note that the control device 2 may end the projection position adjustment process when confirmation after adjustment of the projection positions of the projection images 11 and 12 is not required.

  In this way, the projection system 1 can adjust the projection position adjustment processing of the projection image 11 and the projection image 12 in the superimposed image 20. Moreover, according to such a projection system 1, it is possible to use a capture camera that does not require a high resolution, and it is possible to accurately adjust the alignment of superimposed images by simple signal processing. .

  Next, the hardware configuration of the control device according to the first embodiment will be described with reference to FIG. FIG. 9 is a diagram illustrating an example of a hardware configuration of the control device according to the first embodiment.

  The control device 2 is centrally controlled by a CPU (Central Processing Unit) 101. A random access memory (RAM) 102, a read only memory (ROM) 103, a communication interface 104, a graphic processing device 105, and an input / output interface 106 are connected to the CPU 101 via a bus 107.

  The RAM 102 temporarily stores at least part of an OS (Operating System) program and application programs to be executed by the CPU 101. The RAM 102 stores various data necessary for processing by the CPU 101. The ROM 103 stores an OS and application programs. The ROM 103 stores correspondence information.

  A display device (not shown) is connected to the graphic processing device 105. Various input / output devices such as a mouse and a keyboard (not shown) are connected to the input / output interface 106. The input / output interface 106 can be connected to a portable recording medium interface that can write information to the portable recording medium 110 and read information from the portable recording medium 110. Various input / output devices input / output information to / from the CPU 101 via the input / output interface 106 and the bus 107. The communication interface 104 transmits and receives data to and from other devices (for example, the projectors 5 and 8 and the imaging devices 15 and 16).

  With the hardware configuration described above, the processing functions (zoom amount control unit 3 and projection position control unit 4) of the present embodiment can be realized.

  The control device 2 can be a general-purpose computer. For example, the control device 2 may be a notebook personal computer or the like.

  The control device 2 can be configured to include modules each composed of an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), or the like, or can be configured without the CPU 101. In this case, the control device 2 includes a nonvolatile memory (for example, an EEPROM (Electrically Erasable Programmable ROM), a flash memory, a flash memory type memory card, etc.) and stores module firmware. The nonvolatile memory can write firmware via the portable recording medium 110 or the communication interface 104. As described above, the control device 2 can also update the firmware by rewriting the firmware stored in the nonvolatile memory.

  Next, the configuration of the projector according to the first embodiment and the connection with an external device will be described with reference to FIG. FIG. 10 is a diagram illustrating an example of the configuration of the projector according to the first embodiment and connection with an external device.

  The projectors 5 and 8 are connected to the control apparatus 2 so that the adjustment information can be acquired from the control apparatus 2, and connected to the content server 17 while acquiring image information from the content server 17. The content server 17 holds video content projected by the projectors 5 and 8 as image information.

  The projector 5 includes a control unit 60, an image processing unit 61, a drive unit 62, a projection unit 63, and a projection lens 64. The control unit 60 controls the projector 5 in an integrated manner. The image processing unit 61 determines the projection position of the projection image 11 (the horizontal projection position and the vertical projection position) based on the image information acquired from the content server 17. Further, the image processing unit 61 adjusts (determines) the projection position (the horizontal projection position and the vertical projection position) of the projection image 11 based on the adjustment information acquired from the control device 2. Since the image processing unit 61 determines the projection position by signal processing, the image processing unit 61 can strictly adjust the projection position of the projection image 11 based on the adjustment information. The image processing unit 61 can add a test pattern to the display content in response to an instruction from the control device 2. Further, the image processing unit 61 can clear the test pattern from the display content in response to an instruction from the control device 2.

  The projection unit 63 projects the projection image 11 on the screen according to the projection position determined by the image processing unit 61. The drive unit 62 drives the projection lens 64 by a drive mechanism such as a motor. The projector 5 performs zoom adjustment by driving the projection lens 64. At this time, since the projection position may change due to an error such as backlash or deflection of the mechanical mechanism that drives the projection lens, the projection system 1 performs zoom adjustment prior to adjustment of the projection position. Although the projector 5 has been described above, the same applies to the projector 8.

  Next, the display of the test pattern in the superimposed image of the first embodiment and a modified example of the shooting range will be described with reference to FIG. FIG. 11 is a diagram illustrating a test pattern display in the superimposed image of the first embodiment and a modification of the imaging range.

  The superimposed image 80 displays test patterns 82 and 83 in a shooting range 81 located at the center of the left side of the superimposed image 80, and displays test patterns 84 and 85 in a shooting range 86 located at the center of the right side of the superimposed image 80. . As described above, the superimposed image 80 can display the test patterns at positions that do not become the four corners of the superimposed image 80 because the test pattern has a sufficient distance from the center of the superimposed image 80. Thereby, the projection system 1 can arrange | position a test pattern in the position where an observer's attention is not alerted when there exists an observer (for example, movie audience) of a superimposition image.

  Although the projection system 1 of the first embodiment has been described using an example in which two images are superimposed on the screen, three or more images may be superimposed on the screen. For example, a projection system that superimposes three or more images on a screen repeats the superimposition of two images on the screen by superimposing other images one by one on the reference image. Can be realized.

[Second Embodiment]
Next, the projection system of 2nd Embodiment is demonstrated using FIG. FIG. 12 is a diagram illustrating an example of an imaging range of the imaging device in the projection system of the second embodiment.

  In the first embodiment, the projectors 5 and 8 display the test patterns at the lower left corner and the lower right corner of the projection images 11 and 12, respectively. In the second embodiment, the projectors 5 and 8 In addition to the lower left corner and lower right corner, a test pattern is displayed in the center. In addition, about the structure similar to 1st Embodiment, a code | symbol is made the same and description is abbreviate | omitted.

  The projection system of the second embodiment includes photographing devices 74, 75, and 76. The projector 5 projects the projection image 71 on the screen, and the projector 8 projects the projection image 72 on the screen. The projector 5 projects a test pattern on the lower left corner, lower right corner, and center of the projected image 71. The projector 8 projects a test pattern on the lower left corner, lower right corner, and center of the projected image 72.

  The image capturing device 74 is an image capturing device that captures an image capturing range 73 including an area where the projection image 71 and the projection image 72 are superimposed and projected. The imaging device 75 is an imaging device that captures an imaging range 77 including a region where the projection image 71 and the projection image 72 are superimposed and projected. The image capturing device 76 is an image capturing device that captures an image capturing range 78 including a region where the projection image 71 and the projection image 72 are superimposed and projected. Note that the shooting range 77 is desirably located between the shooting range 73 and the shooting range 78 on the center line CL of the projection image 71 and the projection image 72.

  The control device 2 controls image alignment between the projection image 71 and the projection image 72. The control device 2 determines adjustment information from the image information input from the imaging device 74, the image information input from the imaging device 75, and the image information input from the imaging device 76.

  Based on the adjustment information generated from the image information input from the image capturing device 74 and the image information input from the image capturing device 76, the control device 2 controls the zoom position of the projection lens on both or either of the projectors 5 and 8. Instruct the adjustment of.

  The control device 2 instructs the projector 5 and / or 8 to adjust the image center position of the projection image based on the adjustment information generated from the image information input from the imaging device 75 after adjusting the zoom amount. To do.

  As described above, the projection system 1 may adjust the zoom position of the projection lens and the image center position of the projection image according to three or more photographing ranges. In that case, the projection system 1 may share a role between a shooting range used for adjusting the zoom position of the projection lens and an adjustment range used for adjusting the image center position of the projection image.

In addition, this technique can also take the following structures.
(1) a first projection device that projects a first image;
A second projection device for projecting a second image;
A first imaging device that captures a first corner of a superimposed image in which the first image and the second image are superimposed;
A second imaging device for imaging a second corner of the superimposed image;
A control device that controls image alignment of the first image and the second image from the captured image of the first corner and the captured image of the second corner;
With
The controller is
A zoom error between the zoom amount of the lens of the first projector and the zoom amount of the lens of the second projector is detected from the captured image of the first corner and the captured image of the second corner. A zoom amount control unit that instructs the first projection device and the second projection device to adjust the zoom amount based on the zoom error;
From the captured image of the first corner after adjusting the zoom amount and the captured image of the second corner after adjusting the zoom amount, the projection position of the first projection device and the second projection device A projection position controller that detects a projection position error with respect to the projection position, and instructs the first projection apparatus and the second projection apparatus to adjust a projection position adjustment amount based on the projection position error;
A projection system comprising:
(2) The first image includes a first test pattern at a position corresponding to the first corner, and a second test pattern at a position corresponding to the second corner.
The second image includes a third test pattern at a position corresponding to the first corner, and a fourth test pattern at a position corresponding to the second corner,
The control device determines whether the first image and the third test pattern are offset from the shift amount between the first test pattern and the third test pattern, and the shift amount between the second test pattern and the fourth test pattern. Control the alignment of the two images,
The projection system according to (1).
(3) The first test pattern, the second test pattern, the third test pattern, and the fourth test pattern are respectively a first straight line that is a horizontal line and a second line that is a vertical line. The projection system according to (2), including:
(4) The first test pattern, the second test pattern, the third test pattern, and the fourth test pattern each have a first straight line having a predetermined horizontal component and a predetermined vertical component. And a second straight line having a predetermined horizontal component different from the first straight line and a predetermined vertical component different from the first straight line.
(5) The first corner and the second corner are each one of four corners of the superimposed image,
The first test pattern, the second test pattern, the third test pattern, and the fourth test pattern are L-shaped tests on the first straight line and the second straight line, respectively. Forming a pattern,
The L-shaped test pattern includes the first straight line and the second straight line in the first test pattern, the second test pattern, the third test pattern, and the fourth test pattern. Is the direction located at the peripheral edge of the superimposed image,
The projection system according to (3).
(6) The first photographing device is installed in a direction in which a vertical line of the photographed image at the first corner faces the center of the superimposed image,
The second imaging device is installed in a direction in which a vertical line of a captured image at the second corner faces the center of the superimposed image,
The projection system according to (5).
(7) The control device includes:
A first detection unit that detects a shift amount between the first straight line included in the first test pattern and the first straight line included in the third test pattern;
A second detector for detecting a deviation amount between the second straight line included in the first test pattern and the second straight line included in the third test pattern;
A third detector for detecting a shift amount between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern;
A fourth detector for detecting a shift amount between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern;
The projection system according to any one of (3) to (6).
(8) The control device includes:
The first straight line included in the first test pattern, the first straight line included in the third test pattern, the second straight line included in the first test pattern, and the third test. A first scanning unit that scans a captured image of the first corner using a straight line that intersects all of the second straight lines included in the pattern as a first scanning line;
The first straight line included in the second test pattern, the first straight line included in the fourth test pattern, the second straight line included in the second test pattern, and the fourth test. A second scanning unit that scans a captured image of the second corner using a straight line that intersects all of the second straight lines included in the pattern as a second scanning line;
With
The first detection unit includes an intersection of the first straight line included in the first test pattern and the first scanning line, the first straight line included in the third test pattern, and the first straight line. Detecting an amount of deviation between the first straight line included in the first test pattern and the first straight line included in the third test pattern based on the intersection with the scanning line;
The second detection unit includes an intersection between the second straight line included in the first test pattern and the first scanning line, the second straight line included in the third test pattern, and the first straight line. Detecting an amount of deviation between the second straight line included in the first test pattern and the second straight line included in the third test pattern based on the intersection with the scanning line;
The third detection unit includes an intersection between the first straight line included in the second test pattern and the second scanning line, the first straight line included in the fourth test pattern, and the second Detecting an amount of deviation between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern based on the intersection with the scanning line;
The fourth detector includes an intersection of the second straight line included in the second test pattern and the second scanning line, the second straight line included in the fourth test pattern, and the second Detecting an amount of deviation between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern based on an intersection with the scanning line;
The projection system according to (7).
(9) The zoom amount control unit
A deviation amount between the first straight line included in the first test pattern and the first straight line included in the third test pattern;
Detecting the zoom error from a difference between a shift amount between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern;
The projection system according to (8).
(10) The zoom amount control unit
A deviation amount between the second straight line included in the first test pattern and the second straight line included in the third test pattern;
Detecting the zoom error from a difference between a shift amount between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern;
The projection system according to (8).
(11) The projection position controller
A deviation amount between the first straight line included in the first test pattern and the first straight line included in the third test pattern;
A horizontal projection position error is detected from the sum of the shift amount between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern;
The projection system according to any one of (8) to (10).
(12) The projection position controller
A deviation amount between the second straight line included in the first test pattern and the second straight line included in the third test pattern;
A vertical projection position error is detected from a sum of a shift amount between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern;
The projection system according to any one of (8) to (11).
(13) a first projection device that projects a first image;
A second projection device for projecting a second image;
A first imaging device that captures a first corner of a superimposed image in which the first image and the second image are superimposed;
A second imaging device for imaging a second corner of the superimposed image;
A third photographing device for photographing an intermediate portion of the superimposed image;
A control device for controlling image alignment of the first image and the second image from the captured image of the first corner, the captured image of the second corner, and the captured image of the intermediate portion;
With
The controller is
A zoom error between the zoom amount of the lens of the first projector and the zoom amount of the lens of the second projector is detected from the captured image of the first corner and the captured image of the second corner. A zoom amount control unit that instructs the first projection device and the second projection device to adjust the zoom amount based on the zoom error;
A projection position error between the projection position of the first projection apparatus and the projection position of the second projection apparatus is detected from the captured image of the intermediate portion after the zoom amount adjustment, and the projection position based on the projection position error is detected. A projection position control unit for instructing the adjustment amount to the first projection device and the second projection device;
A projection system comprising:
(14) An adjustment method for image alignment of a superimposed image of a first image projected by a first projection device and a second image projected by a second projection device,
Photographing a first corner of the superimposed image;
Photographing a second corner of the superimposed image;
A zoom error between the zoom amount of the lens of the first projector and the zoom amount of the lens of the second projector is detected from the captured image of the first corner and the captured image of the second corner. And steps to
At least one of adjustment of the zoom amount of the lens of the first projection device according to the zoom error and adjustment of the zoom amount of the lens of the second projection device according to the zoom error is executed. Steps,
From the captured image of the first corner after adjusting the zoom amount and the captured image of the second corner after adjusting the zoom amount, the projection position of the first projection device and the second projection device Detecting a projection position error from the projection position;
Executing at least one of adjustment of the projection position of the first projection apparatus according to the projection position error and adjustment of the projection position of the second projection apparatus according to the projection position error; ,
Adjustment method of superimposed image including image.

  Note that various modifications can be made to the above-described embodiment without departing from the gist of the embodiment.

  Further, the above-described embodiments can be modified and changed by those skilled in the art, and are not limited to the exact configurations and application examples described.

  DESCRIPTION OF SYMBOLS 1 ... Projection system, 2 ... Control apparatus, 3 ... Zoom amount control part, 4 ... Projection position control part, 5, 8 ... Projector, 6, 9 ... Zoom adjustment part, 7, 10 ... Projection Position adjustment unit, 11, 12, 71, 72 ... projected image, 13, 14, 73, 77, 78, 81, 86 ... shooting range, 15, 16, 74, 75, 76 ... shooting device, 17 ... ... Content server, 20, 80 ... Superimposed image, 21, 29 ... Captured image, 22, 23, 27, 28, 82, 83, 84, 85 ... Test pattern, 24 ... Left side of superimposed image, 25 ... Superimposed image bottom side, 26... Superimposed image right side, 30, 31, 38, 39, 41, 42, 49, 50... Straight line portion, 32, 33, 36, 37, 43, 44, 47, 48. 34, 35, 45, 46 ... Connection point, 40, 51 ... Scanner Down, 60 ...... controller, 61 ...... image processing unit, 62 ...... driver, 63 ...... projection unit, 64 ...... projection lens

Claims (14)

A first projection device for projecting a first image;
A second projection device for projecting a second image;
A first imaging device that captures a first corner of a superimposed image in which the first image and the second image are superimposed;
A second imaging device for imaging a second corner of the superimposed image;
A control device that controls image alignment of the first image and the second image from the captured image of the first corner and the captured image of the second corner;
With
The controller is
A zoom error between the zoom amount of the lens of the first projector and the zoom amount of the lens of the second projector is detected from the captured image of the first corner and the captured image of the second corner. A zoom amount control unit that instructs the first projection device and the second projection device to adjust the zoom amount based on the zoom error;
From the captured image of the first corner after adjusting the zoom amount and the captured image of the second corner after adjusting the zoom amount, the projection position of the first projection device and the second projection device A projection position controller that detects a projection position error with respect to the projection position, and instructs the first projection apparatus and the second projection apparatus to adjust a projection position adjustment amount based on the projection position error;
A projection system comprising: The first image includes a first test pattern at a position corresponding to the first corner, and a second test pattern at a position corresponding to the second corner,
The second image includes a third test pattern at a position corresponding to the first corner, and a fourth test pattern at a position corresponding to the second corner,
The control device determines whether the first image and the third test pattern are offset from the shift amount between the first test pattern and the third test pattern, and the shift amount between the second test pattern and the fourth test pattern. Control the alignment of the two images,
The projection system according to claim 1.   The first test pattern, the second test pattern, the third test pattern, and the fourth test pattern are respectively a first straight line that is a horizontal line and a second straight line that is a vertical line. The projection system according to claim 2.   The first test pattern, the second test pattern, the third test pattern, and the fourth test pattern are respectively a first straight line having a predetermined horizontal component and a predetermined vertical component; The projection system according to claim 2, further comprising: a second straight line having a predetermined horizontal component different from the first straight line and a predetermined vertical component different from the first straight line. The controller is
A first detection unit that detects a shift amount between the first straight line included in the first test pattern and the first straight line included in the third test pattern;
A second detector for detecting a deviation amount between the second straight line included in the first test pattern and the second straight line included in the third test pattern;
A third detector for detecting a shift amount between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern;
A fourth detector for detecting a shift amount between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern;
The projection system according to claim 3. The first corner and the second corner are each one of the four corners of the superimposed image,
The first test pattern, the second test pattern, the third test pattern, and the fourth test pattern are L-shaped tests on the first straight line and the second straight line, respectively. Forming a pattern,
The L-shaped test pattern includes the first straight line and the second straight line in the first test pattern, the second test pattern, the third test pattern, and the fourth test pattern. Is the direction located at the peripheral edge of the superimposed image,
The projection system according to claim 3. The controller is
The first straight line included in the first test pattern, the first straight line included in the third test pattern, the second straight line included in the first test pattern, and the third test. A first scanning unit that scans a captured image of the first corner using a straight line that intersects all of the second straight lines included in the pattern as a first scanning line;
The first straight line included in the second test pattern, the first straight line included in the fourth test pattern, the second straight line included in the second test pattern, and the fourth test. A second scanning unit that scans a captured image of the second corner using a straight line that intersects all of the second straight lines included in the pattern as a second scanning line;
With
The first detection unit includes an intersection of the first straight line included in the first test pattern and the first scanning line, the first straight line included in the third test pattern, and the first straight line. Detecting an amount of deviation between the first straight line included in the first test pattern and the first straight line included in the third test pattern based on the intersection with the scanning line;
The second detection unit includes an intersection between the second straight line included in the first test pattern and the first scanning line, the second straight line included in the third test pattern, and the first straight line. Detecting an amount of deviation between the second straight line included in the first test pattern and the second straight line included in the third test pattern based on the intersection with the scanning line;
The third detection unit includes an intersection between the first straight line included in the second test pattern and the second scanning line, the first straight line included in the fourth test pattern, and the second Detecting an amount of deviation between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern based on the intersection with the scanning line;
The fourth detector includes an intersection of the second straight line included in the second test pattern and the second scanning line, the second straight line included in the fourth test pattern, and the second Detecting an amount of deviation between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern based on an intersection with the scanning line;
The projection system according to claim 5. The zoom amount control unit
A deviation amount between the first straight line included in the first test pattern and the first straight line included in the third test pattern;
Detecting the zoom error from a difference between a shift amount between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern;
The projection system according to claim 7. The zoom amount control unit
A deviation amount between the second straight line included in the first test pattern and the second straight line included in the third test pattern;
Detecting the zoom error from a difference between a shift amount between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern;
The projection system according to claim 7. The projection position controller is
A deviation amount between the first straight line included in the first test pattern and the first straight line included in the third test pattern;
A horizontal projection position error is detected from the sum of the shift amount between the first straight line included in the second test pattern and the first straight line included in the fourth test pattern;
The projection system according to claim 7. The projection position controller is
A deviation amount between the second straight line included in the first test pattern and the second straight line included in the third test pattern;
A vertical projection position error is detected from a sum of a shift amount between the second straight line included in the second test pattern and the second straight line included in the fourth test pattern;
The projection system according to claim 7. The first photographing device is installed in a direction in which a vertical line of a photographed image at the first corner faces a center of the superimposed image,
The second imaging device is installed in a direction in which a vertical line of a captured image at the second corner faces the center of the superimposed image,
The projection system according to claim 6. A first projection device for projecting a first image;
A second projection device for projecting a second image;
A first imaging device that captures a first corner of a superimposed image in which the first image and the second image are superimposed;
A second imaging device for imaging a second corner of the superimposed image;
A third photographing device for photographing an intermediate portion of the superimposed image;
A control device for controlling image alignment of the first image and the second image from the captured image of the first corner, the captured image of the second corner, and the captured image of the intermediate portion;
With
The controller is
A zoom error between the zoom amount of the lens of the first projector and the zoom amount of the lens of the second projector is detected from the captured image of the first corner and the captured image of the second corner. A zoom amount control unit that instructs the first projection device and the second projection device to adjust the zoom amount based on the zoom error;
A projection position error between the projection position of the first projection apparatus and the projection position of the second projection apparatus is detected from the captured image of the intermediate portion after the zoom amount adjustment, and the projection position based on the projection position error is detected. A projection position control unit for instructing the adjustment amount to the first projection device and the second projection device;
A projection system comprising: An adjustment method for image alignment of a superimposed image of a first image projected by a first projection device and a second image projected by a second projection device,
Photographing a first corner of the superimposed image;
Photographing a second corner of the superimposed image;
A zoom error between the zoom amount of the lens of the first projector and the zoom amount of the lens of the second projector is detected from the captured image of the first corner and the captured image of the second corner. And steps to
At least one of adjustment of the zoom amount of the lens of the first projection device according to the zoom error and adjustment of the zoom amount of the lens of the second projection device according to the zoom error is executed. Steps,
From the captured image of the first corner after adjusting the zoom amount and the captured image of the second corner after adjusting the zoom amount, the projection position of the first projection device and the second projection device Detecting a projection position error from the projection position;
Executing at least one of adjustment of the projection position of the first projection apparatus according to the projection position error and adjustment of the projection position of the second projection apparatus according to the projection position error; ,
Adjustment method of superimposed image including image.

Images