JP2011022216A - Projection type image display system and method for controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust projection images from a plurality of projectors to the same position on screen. <P>SOLUTION: A horizontal line sensor (14) and a perpendicular line sensor (20) capture projection images projected from all projectors. A system control part (24) detects edges of the projection image of each projector from output signals of sensors (14 and 20) and first controls a focus of a focus optical system (38) according to the detected edges. The system control part (24) then controls an angle of view of a zoom optical system (40). The system control part (24) then controls a projection position by a sift optical system (42). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection-type image display system and a control method thereof, and more particularly to a projection-type image display system that displays an image using a plurality of projectors and a control method that controls the projection positions of the plurality of projectors to the same position. .

JP 2001-067015 A

  An apparatus that projects and displays an image is also called a projector. In order to display a large screen or a brighter screen, a method (stack projection) is known in which a plurality of projectors project the same screen onto the same position. There is also known a method (multi-projection) in which one screen is divided into four and a plurality of units project different images.

  In these projection methods, it is important to adjust the position of the screen displayed by each projector. Patent Document 1 describes that an adjustment test pattern for aligning a projected image is displayed on each projector, and the projection condition of each projector is adjusted.

  In the conventional method for adjusting the position of the projected image, the screens can be aligned when the projector is installed. However, if the projection position gradually shifts after installation, it is necessary to stop using the projector and project the adjustment test pattern and readjust the projection position each time. That is, the projection position cannot be adjusted in real time.

  Therefore, an object of the present invention is to provide a projection type image display system that can adjust the projection position even during normal use without displaying a test pattern, and a control method therefor.

  A projection-type image display system according to the present invention is a projection-type image display system including a plurality of projectors that project an image at the same position on a screen, and each projector is a projection unit that projects an image onto the screen. A projection unit capable of adjusting a focus, an angle of view, and a projection position; an imaging unit that captures an image on the screen and converts the image into an electrical signal; and the projection based on the electrical signal obtained by the imaging unit. Control means for controlling the means, comprising control means for controlling the projection means in the order of the focus, the angle of view, and the projection position.

  A control method for a projection-type image display system according to the present invention includes a plurality of projectors, and each projector includes a projection unit capable of adjusting a focus, an angle of view, and a projection position. A control method for adjusting a projected image to the same position on a screen, the step of projecting an image on the screen from the plurality of projectors, and an image on the screen being captured and converted into an electrical signal in each projector An imaging step for controlling the focus, the angle of view, and the projection position of the projection unit in this order based on the electrical signal obtained by the imaging step in each projector. Features.

  According to the present invention, it is possible to align the screen during normal use without having to display a test pattern.

It is a schematic block diagram of a projector used in an embodiment according to the present invention. It is a schematic diagram which shows the relationship between the projection image on a screen, and the imaging area of a line sensor. It is a schematic block diagram of stack projection. It is a schematic diagram which shows the relationship between each projection image and the imaging area of each line sensor in the case of having four projectors. It is a figure which shows an example of the edge information obtained from the output of the horizontal line sensor of a 1st projector with respect to the projection image of four projectors, and the said output. It is a figure which shows an example of the edge information obtained from the output of the horizontal line sensor of a 2nd projector with respect to the projection image of 4 projectors, and the said output. It is a figure which shows an example of the edge information obtained from the output of the horizontal line sensor of a 3rd projector with respect to the projection image of 4 projectors, and the said output. It is a figure which shows an example of the edge information obtained from the output of the horizontal line sensor of a 4th projector, and the said output with respect to the projection image of 4 projectors.

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

  FIG. 1 shows a schematic block diagram of a projector used in the projection type image display system according to the present invention.

  In FIG. 1, the projector 10 incorporates the following elements. The horizontal line sensor optical system 12 makes the projection image of the projector 10 incident on the horizontal line sensor 14. The horizontal line sensor 14 captures a horizontal line image passing through the center of the projection image. The AD converter 16 digitizes the analog output of the horizontal line sensor 14. As long as the luminance and contrast of the captured image can be measured, a normal image sensor other than the line sensor may be used as the horizontal line sensor 14.

  The vertical line sensor optical system 18 makes the projection image of the projector 10 incident on the vertical line sensor 20. The vertical line sensor 20 captures a vertical line image passing through the center of the projection image. The AD converter 22 digitizes the analog output of the vertical line sensor 20. As long as the brightness and contrast of the captured image can be measured, a normal image sensor other than the line sensor may be used as the vertical line sensor 20.

  The outputs of the AD converters 16 and 22 are input to a system control unit 24 that controls the entire projector 10.

  A video signal is input to the video signal input port 28 from the outside. The video signal processing circuit 30 corrects the luminance and color tone of the video signal from the video signal input port 28 and generates an image signal for display. The video signal processing circuit 30 drives the liquid crystal panel 34 by the panel drive circuit 32 in accordance with the display image signal, and causes the liquid crystal panel 34 to display an image of each frame of the video signal. The projection lamp 36 illuminates the liquid crystal panel 34 from behind. The illumination light transmitted through the liquid crystal panel 34 is projected onto the projection surface (for example, the screen 60 in FIG. 3) by the focus optical system 38, the zoom optical system 40, and the shift optical system 42. Thereby, the display image of the liquid crystal panel 34 is projected and displayed on the screen.

  The video signal processing circuit 30 can also transmit image signal information of an area captured by the horizontal line sensor 14 and the vertical line sensor 20 to the system control unit 24 in the display image signal. On the other hand, the system control unit 24 can control the video signal processing circuit 30 to supply an image signal of a predetermined screen to the panel drive circuit 32.

  In the system control unit 24, the focus control unit 44 controls the focus optical system 38 and the field angle control unit 46 controls the zoom optical system 40. Thus, the size and focus of the display image on the screen can be controlled. The system control unit 24 also controls the shift optical system 42 by the position control unit 48. Thereby, a projection optical axis can be shifted in the direction orthogonal to this. Further, it may have a function of deflecting the projection optical axis.

  The system control unit 24 can also communicate with an external device via the communication circuit 50 and the communication port 52.

  FIG. 2 shows the relationship between the image projected on the screen by the projector shown in FIG. 1 and the imaging ranges of the line sensors 14 and 20. The projector shown in FIG. 1 projects an image 62 onto a screen (or a projection surface such as a wall surface of a room) 60. With respect to the projected image 62, the horizontal line sensor 14 images the horizontal line region 64, and the vertical line sensor 20 images the vertical line region 66.

  The projector shown in FIG. 1 is used, for example, as each projector 10A, 10B, 10C, 10D of a four-projection image display system as shown in FIG. A video signal 54 from a video source (not shown) is input to the video signal input port 28 of the projectors 10A to 10D. The communication ports 52 of the projectors 10A to 10D are connected to each other via a communication line 56, and the projectors 10A to 10D have information on line images captured by the line sensors 14 and 20 and adjustment values of projection positions. Exchange data.

  An image display adjustment operation by the projectors 10A, 10B, 10C, and 10D will be described.

  In each projector 10 </ b> A to 10 </ b> D, the video signal processing circuit 30 adjusts the luminance level and color tone of the video signal input from the video signal input port 28. The video signal processing circuit 30 also transmits image information of an area captured by the horizontal line sensor 14 and the vertical line sensor 20 in the projection image to the system control unit 24.

  The panel drive circuit 32 converts the image signal from the video signal processing circuit 30 into a signal suitable for the liquid crystal panel 34 and drives the liquid crystal panel 34. The liquid crystal panel 34 displays an image according to the drive signal from the panel drive circuit 32, and intensity-modulates the projection light from the projection lamp 36 with the display image. The projection light transmitted through the liquid crystal panel 34 is incident on the screen by the focus optical system 38, the zoom optical system 40, and the shift optical system 42. Thereby, the display image of the liquid crystal panel 34 is projected on the screen.

  In order to realize stack projection by the four projectors 10A to 10D, the focus of each projector 10A to 10D is adjusted by the following method. First, since the four projectors 10A to 10D may be approximately, they are installed facing the screen (projected surface).

  The operator instructs each projector 10A to 10D to start the focus process individually by operating an operation unit (not shown). In accordance with this instruction, the system control unit 24 of the instructed projector 10A controls the video signal processing circuit 30 to project a white image with a uniform screen.

  Since the projected image is a white image with a uniform screen, the horizontal line sensor 14 captures a line image that transitions from black to white and from white to black at the left and right ends of the projected image. On the other hand, the vertical line sensor 20 captures a line image that transitions from black to white and from white to black at the upper end and the lower end of the projection image. The output image signal of the horizontal line sensor 14 is converted into a digital signal by the AD converter 16 and input to the system control unit 24. The output image signal of the vertical line sensor 20 is converted into a digital signal by the AD converter 22 and input to the system control unit 24.

  The system control unit 24 detects and stores the contrast of the captured images of the horizontal line sensor 14 and the vertical line sensor 20 based on the output signals of the AD converters 16 and 22. The system control unit 24 instructs the focus control unit 44 to drive the focus optical system 38 to the far side or the near side by a slight distance. After the movement of the focus optical system 38, the system control unit 24 again detects the contrast of the captured images of the horizontal line sensor 14 and the vertical line sensor 20 based on the output signals of the AD converters 16 and 22. The system control unit 24 compares the previous contrast value with the current contrast value, and controls the focus optical system 38 with the focus control unit 44 so that the contrast value becomes maximum. When the contrast reaches a maximum, the projected image is in focus on the screen. This is a known focus control method called a hill-climbing focus drive method. When the contrast reaches the maximum, the focus process is terminated.

  Through similar operations, the projectors 10B, 10C, and 10D execute the same focus process and focus.

  When the focus processing of all projectors 10A to 10D is completed, the angle of view of each projector 10A to 10D is adjusted. In accordance with the operation of the operator, the system control unit 24 of each of the projectors 10A to 10D drives the zoom optical system 40 by the view angle control unit 46 to adjust the view angle of the projection image. The projectors 10A to 10D are adjusted so that the sizes of the images projected on the screen (projected surface) are approximately the same.

  Next, the operator moves the projectors 10A to 10D, adjusts the direction in which the image is projected, and causes the projection images of all the projectors 10A to 10D to substantially overlap the projection target surface. At this stage, the angle of view of each of the projectors 10A to 10D may be adjusted again so that the projected images have approximately the same size.

  After the rough adjustment as described above, the angle of view and the position of the projection image of each projector 10A to 10D are precisely adjusted. FIG. 4 shows the projected images projected by the projectors 10 </ b> A to 10 </ b> D overlapped with the areas captured by the line sensors 14 and 20 of the projectors 10 </ b> A to 10 </ b> D. Here, for easy understanding, the angle of view and the projection position are extremely shifted.

  With respect to the projection image 70A of the projector 10A, 72A indicates an imaging area of the horizontal line sensor 14 of the projector 10A, and 74A indicates an imaging area of the vertical line sensor 20 of the projector 10A. With respect to the projection image 70B of the projector 10B, 72B indicates an imaging area of the horizontal line sensor 14 of the projector 10B, and 74B indicates an imaging area of the vertical line sensor 20 of the projector 10B. With respect to the projected image 70C of the projector 10C, 72C indicates an imaging area of the horizontal line sensor 14 of the projector 10C, and 74C indicates an imaging area of the vertical line sensor 20 of the projector 10C. With respect to the projection image 70D of the projector 10D, 72D indicates an imaging area of the horizontal line sensor 14 of the projector 10D, and 74D indicates an imaging area of the vertical line sensor 20 of the projector 10D.

  An example of the output waveform of the horizontal line sensor 14 of each projector 10A to 10D for the white image projection will be described. FIG. 5 shows an example of the horizontal distribution of the projected images of the projectors 10A to 10D and the output waveform of the horizontal line sensor 14 of the projector 10A. FIGS. 5A to 5D show projection images (intensity changes in the horizontal direction) of the projectors 10A to 10D. FIG. 5 (5) shows an output waveform of the horizontal line sensor 14 of the projector 10A corresponding to the projection images of the projectors 10A to 10D shown in FIGS. FIG. 5 (6) shows edge information indicating the intensity transition position of the output signal (FIG. 5 (5)) of the horizontal line sensor 14 of the projector 10A. With the edge information shown in FIG. 5 (6), it is possible to quantitatively detect the horizontal positional deviation and the difference in the angle of view of the projected images of the projectors 10A to 10D as viewed from the projector 10A.

  FIG. 6 shows an example of the intensity distribution in the horizontal direction of the projected images of the projectors 10A to 10D and the output waveform of the horizontal line sensor 14 of the projector 10B. Other than showing the output waveform (FIG. 6 (5)) of the horizontal line sensor 14 of the projector 10B, not the horizontal line sensor 14 of the projector 10A, and the edge information (FIG. 6 (6)) indicating the intensity transition position, This is the same as FIG. With the edge information shown in FIG. 6 (6), it is possible to quantitatively detect the horizontal displacement and the difference in the angle of view of the projection images of the projectors 10A to 10D as viewed from the projector 10B.

  FIG. 7 shows an example of the intensity distribution in the horizontal direction of the projected images of the projectors 10A to 10D and the output waveform of the horizontal line sensor 14 of the projector 10C. Other than showing the output waveform (FIG. 7 (5)) of the horizontal line sensor 14 of the projector 10C, not the horizontal line sensor 14 of the projector 10A, and edge information (FIG. 7 (6)) indicating the intensity transition position thereof, This is the same as FIG. With the edge information shown in FIG. 7 (6), it is possible to quantitatively detect the horizontal positional deviation and the difference in the angle of view of the projected images of the projectors 10A to 10D viewed from the projector 10C.

  FIG. 8 shows an example of the intensity distribution in the horizontal direction of the projected images of the projectors 10A to 10D and the output waveform of the horizontal line sensor 14 of the projector 10D. Other than showing the output waveform (FIG. 8 (5)) of the horizontal line sensor 14 of the projector 10D, not the horizontal line sensor 14 of the projector 10A, and edge information (FIG. 8 (6)) indicating the intensity transition position, This is the same as FIG. With the edge information shown in FIG. 8 (6), it is possible to quantitatively detect the horizontal positional deviation and the difference in the angle of view of the projected images of the projectors 10A to 10D viewed from the projector 10D.

  In response to an operator's instruction, the system control unit 24 of each projector 10A to 10D shifts to the automatic alignment mode. In the automatic alignment mode, the projectors 10A to 10D operate cooperatively as described below to completely match the projection images of the projectors 10A to 10D. In the automatic alignment mode, any one of the projectors 10A to 10D is a master machine. As a reference for selecting the master machine, the order in which the automatic alignment mode is entered may be used, a random number may be used, or the serial numbers of the projectors 10A to 10D may be used. Here, it is assumed that projector 10A is selected as the master machine.

  The system control unit 24 of the master machine (projector 10 </ b> A) generates edge information from the captured images of the horizontal line sensor 14 and the vertical line sensor 20. The master machine also instructs the other projectors 10B to 10D to transmit edge information obtained from the captured images of the horizontal line sensor 14 and the vertical line sensor 20 to the master machine. The system control unit 24 of each projector 10 </ b> B to 10 </ b> D that has received a command from the master device through the communication port 52 generates edge information from the captured images of the horizontal line sensor 14 and the vertical line sensor 20.

  For example, in the master machine (projector 10A), the horizontal line sensor 14 outputs the signal shown in FIG. 5 (5), and the system control unit 24 detects the edge information shown in FIG. 5 (6). Similarly, in the projectors 10B to 10D, the horizontal line sensor 14 outputs the signals shown in FIGS. 6 (5) to 8 (5), respectively, and the system control unit 24 uses FIGS. 6 (6) to 8 (6). The edge information shown in FIG.

  The system control unit 24 of each projector 10A to 10D refers to the imaging field angle characteristics of the horizontal line sensor 14 and the field angle information of the projection image by the zoom optical system 40, and which edge in the horizontal direction is the projection image of the projectors 10A to 10D. It is determined whether it is due to. Similarly, the system control unit 24 of each projector 10A to 10D refers to the imaging field angle characteristic of the vertical line sensor 20 and the field angle information of the projected image by the zoom optical system 40, and which edge in the vertical direction is the projector 10A to 10D. It is discriminated whether it is based on the projected image.

  For example, in the example shown in FIG. 5, the system control unit 24 of the projector 10A determines that the edges eg1, eg6 are edges based on the projection image of the projector 10A.

  In the example illustrated in FIG. 6, the system control unit 24 of the projector 10B determines that the edges eg3 and eg4 are edges based on the projection image of the projector 10B.

  In the example shown in FIG. 7, the system control unit 24 of the projector 10C determines that the edges eg0 and eg5 are edges based on the projection image of the projector 10C.

  In the example illustrated in FIG. 8, the system control unit 24 of the projector 10D determines that the edges eg2, eg7 are edges based on the projection image of the projector 10D.

  The system control unit 24 of the projectors 10 </ b> B to 10 </ b> D transmits which edge is an edge based on the projected image of the own device from the communication circuit 50 to the master device (projector 10 </ b> A) through the communication port 52.

  The system control unit 24 of the master machine (projector 10A) integrates the edge information from the other projectors 10B to 10D and the edge information of the own machine, and determines the angle of view and the projection position of the projected image of each projector 10A to 10D. The angle of view and position adjustment information for matching is calculated.

  Regarding the adjustment of the angle of view, the angle of view information that matches the distance between the edges is calculated from the edge information of the projectors 10A to 10D. At this time, for example, the angle of view of the projectors 10A to 10D may be matched with the angle of view of any projector (for example, the master machine), or may be matched with the average value of the current angles of view of the projectors 10A to 10D. good.

  For example, the method of employing the average is as follows. Assume that the distance between the edges eg1, eg6 according to the projection image of the projector 10A is 12.2. Assume that the distance between the edges eg3 and eg4 according to the projection image of the projector 10B is 7.5. Assume that the distance between the edges eg0 and eg5 according to the projection image of the projector 10C is 13.2. It is assumed that the distance between the edges eg2 and eg7 by the projection image of the projector 10D is 13.2. The average value is 11.525. Each projector 10A to 10D adjusts the angle of view so that the distance between the edges becomes equal to the average value.

  The projection angle characteristics of the projectors 10A to 10D may be different because the projection optical characteristics of the projectors 10A to 10D are different or the distances to the projection surfaces are different. In such a case, the angle of view of another projector is adjusted in accordance with the projector having the narrowest adjustment range of the angle of view. When there is a projector whose angle of view adjustment is difficult or impossible, the operator is warned to that effect. Then, the installation position of the projector that cannot be dealt with by the angle of view adjustment is adjusted, and the imaging from the line sensor is performed again.

  The system control unit 24 of the master machine (projector 10A) causes the angle of view control unit 46 to adjust the angle of view of the zoom optical system 40 in accordance with the calculated angle of view adjustment information. The master machine (projector 10A) also transmits to the other projectors 10B to 10D through the communication circuit 50 and the communication port 52 in accordance with the view angle adjustment information calculated for the other projectors 10B to 10D.

  The system control unit 24 of each projector 10 </ b> B to 10 </ b> D receives the view angle adjustment information from the master machine through the communication port 52 and the communication circuit 50. Then, the system control unit 24 causes the angle of view control unit 46 to control the angle of view of the zoom optical system 40 according to the received angle of view adjustment information. Thereby, the angle of view of the projection image of each projector 10B-10D is adjusted according to the instruction | indication of the angle of view adjustment from a master machine (projector 10A).

  When the adjustment of the angle of view of each of the projectors 10A to 10D is completed, the position of the projected image is adjusted according to the procedure described below. That is, each of the projectors 10A to 10D captures a projection image again by the horizontal line sensor 14 and the vertical line sensor 20, and the system control unit 24 detects an edge. The system control unit 24 of the projectors 10B to 10D transmits the detected edge information to the master device (projector 10A) via the communication circuit 50 and the communication port 52.

  The system control unit 24 of the master machine (projector 10A) integrates the edge information of the own machine and the edge information from the projectors 10B to 10D, and calculates the relative projection positions of the projection images of the projectors 10A to 10D. Then, the position adjustment information of the projectors 10A to 10D is calculated so that the relative projection positions of the projection images of the projectors 10A to 10D match. The projection positions of the projectors 10A to 10D are adjusted by the shift optical system 42 under the control of the position control unit 48, but the adjustment width does not exceed the adjustment range of the shift optical system 42 of any projector 10A to 10D. Is calculated.

  A specific method for calculating position adjustment information will be described. The average of the display positions of the projection images of all the projectors 10A to 10D is calculated in each of the horizontal direction and the vertical direction. Then, horizontal and vertical adjustment values for adjusting the image projection positions of the projectors 10A to 10D to positions corresponding to the average values are calculated. In this method, the total adjustment width of the shift optical system 42 of each projector 10A to 10D is minimized. When the adjustable range of any of the projectors 10A to 10D is exceeded, the operator is warned by a warning means or a display means (not shown). The operator manually moves the corresponding projectors 10A to 10D to redo automatic adjustment.

  The system control unit 24 of the master machine (projector 10A) adjusts the projection position of the projected image in the horizontal direction and the vertical direction by controlling the shift optical system 42 by the position control unit 48 according to the position adjustment information for the own machine. The system control unit 24 of the other projectors 10B to 10D acquires the position adjustment information from the master machine (projector 10A) via the communication port 52 and the communication circuit 50. The system control unit 24 of each of the projectors 10B to 10D adjusts the projection position of the projected image in the horizontal direction and the vertical direction by controlling the shift optical system 42 by the position control unit 48 according to the position adjustment information from the master machine.

  After adjusting the focus, the angle of view, and the image projection position, the system control unit 24 of each projector 10 </ b> A to 10 </ b> D causes the video signal processing circuit 30 to stop outputting the adjustment image (white image) from the video signal input port 28. An image signal corresponding to the input video signal is output.

  In a present Example, when projecting the display image of several projector 10A-10D to the same position on a to-be-projected surface, a focus, a field angle, and a projection position can be adjusted automatically automatically, and the image which improved the brightness | luminance can be displayed. .

  The adjustment operation after starting use of the present embodiment will be described. It is assumed that the focus, the angle of view, or the image projection position is shifted in any one or a plurality of the four projectors 10A to 10D. Here, it is assumed that a deviation has occurred in the projector 10D.

  If a white image is projected in the same way as in the initial adjustment, the deviation of the projected image can be detected as an edge deviation and can be automatically adjusted. However, in a usage situation in which a normal input image is projected, it is not desirable to suspend the projection and project a white image for adjustment.

  When displaying an image of the input video signal, the video signal processing circuit 30 transmits image information of an area captured by the horizontal line sensor 14 and the vertical line sensor 20 in the image of the input video signal to the system control unit 24. To do.

  The system control unit 24 monitors the image near the left end and the image near the right end in the image captured by the horizontal line sensor 14, and detects an edge portion from a change in contrast when there is a luminance level above a certain level. Then, the system control unit 24 stores the detected edge position as edge information.

  However, since there is a difference in the amount of information required for focus detection, field angle detection, and projection image position detection, the following is performed. That is, in the focus detection, it is sufficient to use information on any one of the left and right edges of the screen by the horizontal line sensor 14 and the upper and lower edges of the screen by the vertical line sensor 20. Accordingly, in the automatic adjustment mode, the system control unit 24 determines that the focus control is possible when the image information from the video signal processing circuit 30 has a certain luminance level or higher in any of the above-described areas. Then, contrast detection is performed, and focus is controlled by a hill climbing method.

  However, which projector out of the four projectors 10A to 10D is out of focus cannot be determined only by detecting the contrast at the edge of the screen. Therefore, the system control unit 24 of the master machine shifts the focus to the far side or the near side within the range that the observer cannot visually recognize but can detect the contrast in order with respect to the other projectors 10B to 10D. Find a combination that improves contrast in the process of moving the focus. For example, it is assumed that the contrast decreases even when the focus of the projectors 10A, 10B, and 10C is shifted to the far side and the near side, and the contrast increases when the focus of the projector 10D is shifted to the far side. In this case, since it can be determined that the projector 10D is out of focus, the focus of the projector 10D is controlled by adjusting the focus.

  When focus adjustment is completed in this way, the angle of view adjustment mode is entered. In the angle of view adjustment, any information on either the screen right edge and the screen left edge or the screen upper edge and the screen lower edge out of the screen left edge and the screen right edge by the horizontal line sensor 14 or the screen upper edge and the screen lower edge by the vertical line sensor 20 is sufficient. . Therefore, the system control unit 24 detects an edge in the image information from the video signal processing circuit 30 when it is determined that there is a certain luminance level or more in the area. Based on the detected edge, the angle of view of each projector 10A to 10D is detected by the same method as described above.

  When the angle of view is shifted in any of the projectors 10A to 10D, the master machine (projector 10A) transmits the angle of view adjustment information so as to adjust the angle of view to the projector. The system control unit 24 of the projector that has received the view angle adjustment information controls the zoom optical system 40 by the view angle control unit 46 according to the received view angle adjustment information, and adjusts the view angle.

  When the angle of view adjustment is completed, the position adjustment mode is entered. In the position adjustment, it is only necessary to have information on one area in the horizontal direction and one in the vertical direction among the left and right edges of the screen by the horizontal line sensor 14 and the upper and lower edges of the screen by the vertical line sensor 20. The system control unit 24 detects an edge in the image information from the video signal processing circuit 30 when it is determined that there is a certain luminance level or more in the region. Based on the detected edges, the horizontal and vertical positions of the projected images of the projectors 10A to 10D are calculated in the same manner as described above, and the image projection positions are adjusted.

  Thus, while displaying the image of the input video signal, the focus, the angle of view, and the projection position are automatically set so that the projection images of the four projectors 10A to 10D are displayed at the same position on the projection surface. Can be adjusted.

  When the position adjustment is completed, the focus adjustment mode may be entered again. Alternatively, the adjustment is waited until the adjustment mode is entered at any timing of the user.

14: Horizontal line sensor 20: Vertical line sensor 38: Focus optical system 40: Zoom optical system 42: Shift optical system

Claims (4)

A projection-type image display system comprising a plurality of projectors that project an image at the same position on a screen,
Each of the projectors
A projection means for projecting an image onto the screen, the projection means capable of adjusting a focus, an angle of view and a projection position;
Imaging means for capturing an image on the screen and converting it into an image signal;
Control means for controlling the projection means based on the image signal obtained by the imaging means, the control means for controlling the projection means in the order of the focus, the angle of view, and the projection position. Projection-type image display system.   The projection type image display system according to claim 1, wherein the control unit includes a unit that detects an image projected from the projection unit from the image on the screen.   The projection type image display system according to claim 1, wherein the imaging unit includes at least one of a horizontal line sensor and a vertical line sensor. In a projection-type image display system having a plurality of projectors, each projector having a projection means capable of adjusting a focus, an angle of view, and a projection position, a control method for adjusting projected images of the plurality of projectors to the same position on a screen There,
Projecting images from the plurality of projectors onto the screen;
In each of the projectors, an imaging step of capturing an image on the screen and converting it into an image signal;
Each projector includes a control step of controlling the focus, the angle of view, and the projection position of the projection unit in this order based on the image signal obtained in the imaging step. Control method of image display system.

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