JP2013218180A - Projection system and image display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support able to compose a projection system easily.SOLUTION: A projection system 1 includes first and second projectors 2U and 2D and a support 4, and displays a projection image by superimposing images projected from the first and second corresponding projectors 2U and 2D onto a target projection surface. The support 4 supports the first and second projectors 2U and 2D while their respective projection distances from the first and second projectors 2U and 2D to the target projection surface differ from each other.

Description

  The present invention relates to a projection system and an image display method.

Conventionally, a video display system (projection system) using a plurality of projectors is known (see, for example, Patent Document 1).
In the projection system described in Patent Document 1, a stack projection method is employed in which images projected from a plurality of projectors are superimposed on a projection surface such as a screen, thereby displaying a projection image on the projection surface. Yes.
And by adopting such a stack projection method, compared with the case where only one projector is used, it is possible to display a projected image with improved brightness on the projection surface, or to display a stereoscopic image or 2 It is possible to display a projection image capable of observing various types of images.

JP 2011-33805 A

By the way, in the stack projection method, as described above, it is necessary to superimpose the images projected from a plurality of projectors on the projection surface.
For this reason, when constructing a projection system, the relative positional relationship between a plurality of projectors is important.
For example, in the case of using two of the first and second projectors, the postures of the first and second projectors are appropriately adjusted so that the images projected from the first and second projectors overlap on the projection surface. Need to change.
That is, there is a problem that it is difficult to construct a projection system because it is necessary to appropriately change the postures of the first and second projectors.

  An object of the present invention is to provide a projection system and an image display method capable of easily constructing a projection system.

  A projection system according to the present invention is a projection system that includes a first projector and a second projector, and displays a projected image by superimposing images projected from the first projector and the second projector on a projection surface. And a support for supporting the first projector and the second projector, wherein the support has the first projection in a state where the projection distances from the first projector and the second projector to the projection surface are different. A projector and the second projector are supported.

In the present invention, the projection system includes the support described above.
Thus, the user can easily define the relative positional relationship between the first and second projectors by supporting the first and second projectors on the support.
Accordingly, when the projection system including the first and second projectors is constructed, the projection system can be easily constructed by using the above-described support tool.

By the way, when performing stack projection using the first and second projectors, it is necessary to superimpose (match) the images projected from the first and second projectors on the projection surface. For this reason, it is necessary to calibrate the shape of the image projected on the projection surface from at least one of the first and second projectors (perform keystone distortion correction).
Here, for example, the first and second projectors are the same size projectors. In addition, when the first and second projectors are arranged in a state where the projection distances of the first and second projectors are the same (a state where the positions in the projection direction are the same) with the support tool, Problems arise.
In the following description, for convenience of explanation, an image projected on the projection surface from the second projector (hereinafter referred to as a second image) is rectangular, and the first image of the rectangular second image is the first. A configuration for superimposing images (hereinafter referred to as first images) projected from the projector onto the projection surface will be described.

First, in the first projector, the posture when the rectangular first image (an image having the same size as the second image) before being superimposed on the second image is projected as the first posture, The posture in which the inclination is changed from the posture and the first image that can be superimposed on the second image is projected is defined as the second posture.
The first image that is rectangular in the first posture has a trapezoidal distortion in the second posture, but is corrected to a rectangular shape by performing the trapezoidal distortion correction.
In general, the projector is set to perform so-called tilt projection, in which the projector is projected upward from the directly facing position when the projector is placed on the floor or on a desk.
Then, when the first and second projectors set as described above are arranged so as to be stacked, and the first projector located above is inclined downward in order to overlap the images, the trapezoidal distortion correction is performed as described above. The rectangular first image calibrated by performing the above is smaller in size than the first image projected on the projection surface in the first posture.
That is, in the second projector, it is necessary to reduce the size of the second image in accordance with the size of the first image whose size is reduced by the keystone correction in the first projector. Therefore, there arises a problem that the size of the projection image in which the first and second images are superimposed is reduced.

In the present invention, the support tool supports the first and second projectors in a state where the projection distances of the first and second projectors are different (states where the positions in the projection direction are shifted).
In the following description, for the convenience of explanation, it is assumed that the projection distance of the first projector is set longer than the projection distance of the second projector.
That is, when the first projector is arranged in the first posture, the size of the rectangular first image projected on the projection surface is larger than that of the second image. Similarly, by arranging the first projector in the second posture, the size of the trapezoidal first image projected on the projection surface is also larger than that of the second image.
Therefore, as described above, when the first image is superimposed on the rectangular second image, the size of the first image projected on the projection surface can be set large in advance, so that the first projector can correct the first by the trapezoidal distortion correction. If one image is calibrated to a rectangular shape, the first and second images can be superimposed without reducing the size of the second image. That is, the size of the rectangular projection image in which the first and second images are superimposed is not reduced.

  In the projection system according to the aspect of the invention, it is preferable that the support supports the first projector and the second projector so that the first projector and the second projector are juxtaposed along the thickness direction.

In the present invention, the support tool supports the first and second projectors as described above.
Thereby, in the 1st, 2nd projector, the projection lenses which project an image can be located in the position which adjoined.
In the following, for convenience of explanation, the second image projected onto the projection surface from the second projector is assumed to have a rectangular shape as described above, and the first image is superimposed on the second image. The configuration will be described.

For example, when the projection lenses are positioned at positions separated from each other, the projection angle of the image projected from the second projector onto the projection surface and the projection angle of the image projected from the first projector onto the projection surface Are very different.
That is, the trapezoidal distortion degree in the first image projected from the first projector onto the projection surface is positioned at a position where the projection lenses are separated from each other as compared with the case where the projection lenses are positioned close to each other. If it is, it will be bigger.
Therefore, by positioning the projection lenses at positions close to each other, the first image can be superimposed on the second image while reducing the processing load when performing the trapezoidal distortion correction.
Further, by supporting the first and second projectors as described above with the support tool, the unit in which the first and second projectors and the support tool are integrated can be compactly gathered.

  In the projection system according to the aspect of the invention, the first projector may be disposed at a position that covers a part of the top surface of the second projector by being supported by the support, and may be disposed on the top surface of the second projector. Preferably, an operation unit for operating the second projector is provided, and the operation unit is provided in a region other than the region covered with the first projector on the top surface.

Here, examples of the operation unit include the following configurations.
For example, an operation panel having a power button or the like can be exemplified as the operation unit.
For example, examples of the operation unit include an operation button for enlarging or reducing an image on the projection surface and a zoom ring for adjusting a zoom position in the projection lens.
Furthermore, examples of the operation unit include an operation button for focusing an image on the projection surface and a focus ring for adjusting the focus position in the projection lens.

In the present invention, the operation unit is provided in an area other than the area covered by the first projector on the top surface of the second projector.
Thus, even when the first and second projectors are supported by the support, the operation of the operation unit can be performed by the user, and the operability of the second projector can be ensured.

The image display method of the present invention is an image display method used in a projection system that displays a projected image by superimposing images projected from a first projector and a second projector on a projection surface, The projector and the second projector are supported by a support in a state where projection distances from the first projector and the second projector to the projection surface are different, and the image display method includes the first projector and the second projector. Based on the image projected on the projection surface from the projector with the shorter projection distance among the two projectors, the images projected on the projection surface from the projector with the longer projection distance are combined. It is characterized by.
In the present invention, since the image display method is a method used in the above-described projection system, the same operation and effect as the above-described projection system can be enjoyed.

The perspective view which shows the usage condition of the projection system in this embodiment. FIG. 3 is a block diagram showing a control structure of the first projector in the embodiment. The figure which shows the structure of the support tool in this embodiment. The figure which shows the structure of the support tool in this embodiment. The figure which shows the structure of the support tool in this embodiment. The figure which shows the structure of the support tool in this embodiment. 6 is a flowchart illustrating an image display method according to the present embodiment. The figure for demonstrating the image display method in this embodiment. The figure for demonstrating the effect in this embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Configuration of the projection system]
FIG. 1 is a perspective view showing a usage pattern of a projection system 1 in the present embodiment.
In the present embodiment, the projection system 1 displays the projection image PF (FIG. 1) on the reflective screen (projection surface) Sc (FIG. 1) by stack projection and stereoscopically displays the projection image PF to the observer. 3D projection system.
As shown in FIG. 1, the projection system 1 includes a first projector 2U, a second projector 2D, polarized glasses 3, and a support 4 (see FIGS. 3 to 6).

[Configuration of the first and second projectors]
FIG. 2 is a block diagram showing a control structure of the first projector 2U.
The first projector 2U forms a left-eye image, and projects the left-eye image on the screen Sc with a predetermined linearly polarized light (hereinafter referred to as a first linearly polarized light).
The second projector 2D forms an image for the right eye and projects the image for the right eye on the screen Sc with the second linearly polarized light whose polarization direction is orthogonal to the first linearly polarized light.
On the screen Sc, a projection image PF in which the left-eye image and the right-eye image are superimposed on each other is displayed.

The first and second projectors 2U and 2D described above have the same configuration.
For this reason, below, the structure of the 1st projector 2U is mainly demonstrated, about 2nd projector 2D, the code | symbol same as the 1st projector 2U is attached | subjected and description is abbreviate | omitted.
As shown in FIG. 1 or FIG. 2, the first projector 2U includes an optical unit 22 (FIG. 2), an imaging device 23 (FIG. 2), and an optical housing 22 (FIG. 2) housed in an exterior casing 21 (FIG. 1) that constitutes the exterior. A control device 24 (FIG. 2) is provided.
As shown in FIG. 1, the exterior casing 21 includes a top surface 21 </ b> A located on the upper side, a bottom surface 21 </ b> B located on the lower side, and a projection side in the case of regular installation (FIG. 1) installed on the floor or the like. 21C and a substantially rectangular parallelepiped shape having a rear surface 21D positioned on the opposite side to the projection side.
The top surface 21A has the following configuration (see FIG. 3).
That is, on the top surface 21A, an operation panel 211 having a power button 211A, an operation button 211B for performing stack projection, and the like is provided on the back surface 21D side.

On the top surface 21A, on the front surface 21C side, an operation button 212A for enlarging or reducing an image on the screen Sc and an operation button 212B for focusing the image on the screen Sc are provided.
Furthermore, in the top surface 21A, an opening 213 is formed on the front surface 21C side.
The zoom ring 212C and the focus ring 212D connected to the projection lens 223 constituting the optical unit 22 are exposed to the outside.
The zoom ring 212 </ b> C is configured to be rotatable and is a member that adjusts the zoom position of the projection lens 223.
The focus ring 212D is a member that is configured to be rotatable and adjusts the focus position of the projection lens 223.
Further, on the top surface 21A, on the front surface 21C side, there is an operation knob 212E for operating a lens shutter (not shown) for opening and closing the projection port 214 for allowing the image projected from the projection lens 223 to pass therethrough. Is provided.
Each member 212A-212E demonstrated above is equivalent to the operation part 212 which concerns on this invention.

As shown in FIG. 2, the optical unit 22 includes a light source device 221, a light modulation device 222 such as a liquid crystal panel, and a projection lens 223. The light beam emitted from the light source device 221 is modulated by the light modulation device 222 and projected from the projection lens 223 onto the screen Sc.
Note that the first and second projectors 2U and 2D are set to perform so-called tilt projection, which projects upward from a position facing directly in the normal installation.

The imaging device 23 images the screen Sc under the control of the control device 24 and outputs a signal corresponding to the captured image to the control device 24.
In the present embodiment, the imaging device 23, although not specifically illustrated, detects a red CCD (Charge Coupled Device) that detects red light, a green CCD that detects green light, and blue light. It consists of a 3CCD camera with a blue CCD.
Then, the imaging device 23 outputs R, G, and B signals (signals corresponding to the captured image) detected by the red, green, and blue CCDs to the control device 24.

As shown in FIG. 2, the control device 24 includes a main control unit 241 including a CPU (Central Processing Unit) and the like, and controls the entire first projector 2U according to a control program stored in the memory 242. To do.
As shown in FIG. 2, the control device 24 includes a main control unit 241 and a memory 242, a signal determination unit 243, a left eye storage unit 244L, a right eye storage unit 244R, a timing controller 245, a display control unit 246, and the like. Prepare.
The signal determination unit 243 determines a left-eye image signal and a right-eye image signal from left and right image signals included in an input signal input from the outside.
Then, the signal determination unit 243 stores the left-eye image signal as left-eye image data in the left-eye storage unit 244L, and stores the right-eye image signal as right-eye image data in the right-eye storage unit 244R.
Note that the left and right eye image data stored in the left and right eye storage units 244L and 244R are respectively constituted by a collection of data for each frame.

The display control unit 246 reads one of the left and right eye image data stored in the left and right eye storage units 244L and 244R, and causes the light modulation device 222 to form an image based on the read image data.
For example, the display control unit 246 recognizes the ON or OFF of a dip switch (not shown) that is exposed outside the exterior housing 21 so that the projector controls the first projector that projects the image for the left eye. Or the second projector that projects the image for the right eye.
If the display control unit 246 recognizes the first projector, the display control unit 246 reads the left-eye image data stored in the left-eye storage unit 244L and causes the light modulator 222 to form the left-eye image. On the other hand, when the display control unit 246 recognizes the second projector, the display control unit 246 reads the right-eye image data stored in the right-eye storage unit 244R and causes the light modulation device 222 to form the right-eye image.

The display control unit 246 includes an image processing unit 246A and a driving unit 246B.
The image processing unit 246A performs various image processes on the image data read from either the left or right eye storage unit 244L or 244R.
For example, the image processing unit 246A performs a three-dimensional vector operation on the pixel position information (coordinates) of the image data, using the coefficients set by the main control unit 241, thereby performing image processing on the image data. To correct keystone distortion.
The driving unit 246B outputs a driving signal based on the image data subjected to the image processing by the image processing unit 246A to the light modulation device 222, and causes the light modulation device 222 to form an image.

The timing controller 245 reads a synchronization signal (vertical synchronization signal, horizontal synchronization signal) included in an input signal input from the outside, and causes the display control unit 246 to execute processing.
That is, the timing controllers 245 constituting the first and second projectors 2U and 2D synchronize the display timings of the left and right eye images projected from the first and second projectors 2U and 2D and projected on the screen Sc. I'm taking it.

The main control unit 241 outputs a control command to the display control unit 246 and the like according to the control program stored in the memory 242.
As shown in FIG. 2, the main control unit 241 includes a captured image acquisition unit 241A, a coefficient calculation unit 241B, and the like.
The captured image acquisition unit 241A controls the operation of the imaging device 23 and causes the imaging device 23 to capture the screen Sc. And captured image acquisition part 241A acquires a captured image based on the signal (R, G, B signal) output from the imaging device 23. FIG.
The coefficient calculation unit 241B calculates the above-described coefficient used for trapezoidal distortion correction in the display control unit 246 based on the captured image acquired by the captured image acquisition unit 241A.
In addition to the control program, the memory 242 stores first and second calibration image data related to first and second calibration images to be described later for performing stack projection by two projectors.

[Configuration of polarized glasses]
The polarizing glasses 3 are worn by an observer, and include a left-eye transmission part 31 and a right-eye transmission part 32 as shown in FIG.
The left-eye transmission unit 31 is composed of a polarizing lens whose transmission axis is in the same direction as the polarization direction of the first linearly polarized light.
The right-eye transmission unit 32 includes a polarizing lens whose transmission axis is the same as the polarization direction of the second linearly polarized light.
With the above configuration, in the projection system 1, the left-eye image included in the projection image PF on the screen Sc is visually recognized only by the left eye of the observer through the left-eye transmission unit 31. In addition, the right-eye image included in the projection image PF is visually recognized only by the right eye of the observer through the right-eye transmission unit 32.
For this reason, the observer stereoscopically views the projection image PF on the screen Sc by parallax.

[Composition of support tool]
3 to 6 are diagrams showing the configuration of the support 4. Specifically, FIG. 3 shows a state in which the first and second projectors 2U and 2D are supported by the support 4 and the first projector 2U is positioned at the first position as viewed from the front side (projection side). It is a perspective view. FIG. 4 is a view of the disassembled support tool 4 as viewed from the side. FIG. 5 is a perspective view of the state in which the first and second projectors 2U and 2D are supported by the support 4 and the first projector 2U is positioned at the second position, as viewed from the front side. FIG. 6 is a side view of the state shown in FIG.
3 to FIG. 6 show the normal installation (the posture in which the top surface 21A of the first and second projectors 2U and 2D is located above the bottom surface 21B (the first support member 5 is installed on the floor or the like). In addition, the case of a posture))) positioned on the upper side with respect to the second support member 6 is illustrated.
In the following, for convenience of explanation, the projection direction of the image from the second projector 2D is the Z axis (+ is the projection direction,-is the reverse direction of the projection direction), the horizontal axis orthogonal to the Z axis is the X axis, The vertical axis perpendicular to the Z axis is taken as the Y axis (the upper side in the normal installation is + and the lower side is-) (FIGS. 3 to 6).
The support 4 supports the first and second projectors 2U and 2D.
As shown in FIGS. 3 to 6, the support 4 includes a first support member 5, a second support member 6, a mounting screw 7, and a positioning screw 8.

[Configuration of First Support Member]
The first support member 5 is a member that supports the first projector 2U.
As shown in FIGS. 3 to 6, the first support member 5 includes a first fixing portion 51 and a pair of first connection portions 52A and 52B.
The first fixing portion 51 is configured by a rectangular plate having substantially the same size as the bottom surface 22 of the first projector 2U.
Then, as shown in FIGS. 3 to 6, the first projector 2U (bottom surface 22) is fixed to the plate surface (the upper surface in FIGS. 3 to 6) of the first fixing portion 51 with screws (not shown). .

The pair of first connection parts 52A and 52B are respectively connected to the respective edges facing each other along the X-axis direction in the first fixed part 51, and from each of the edges to the lower side in FIGS. It is composed of a plate body that hangs down.
More specifically, as shown in FIGS. 3 to 6, the pair of first connection parts 52A and 52B is configured by a plate body parallel to the YZ plane.
Since the pair of first connection parts 52A and 52B have the same function (a mounting hole 521 and positioning screw holes 522A to 522D described later), they are positioned on the right side in FIG. The first connection part 52A will be mainly described.

As shown in FIG. 4, the first connecting portion 52 </ b> A is formed with a mounting hole 521 that penetrates along the X-axis direction and is screwed with a mounting screw 7 described later.
The mounting holes 521 formed in the pair of first connection portions 52A and 52B are formed at positions facing each other along the X-axis direction, although not specifically illustrated.
In addition, as shown in FIG. 4, the first connecting portion 52A is formed with four positioning screw holes 522A to 522D that penetrate along the X-axis direction and are screwed with positioning screws 8 described later. Yes.
The functions of the four positioning screw holes 522A to 522D will be described later.

[Configuration of Second Support Member]
The second support member 6 is a member that supports the second projector 2D.
As shown in FIGS. 3 to 6, the second support member 6 includes a second fixing portion 61 and a pair of second connection portions 62A and 62B (see FIGS. 3 and 5) in substantially the same manner as the first support member 5. ).
The second fixing portion 61 is configured by a rectangular plate having a dimension slightly larger in the X-axis direction than the bottom surface 22 of the second projector 2D.
The second projector 2D (bottom surface 22) is fixed to the plate surface (the upper surface in FIGS. 3 to 6) of the second fixing portion 61 with screws (not shown) as shown in FIGS. . Although not described in detail, the second fixing portion 61 is provided with a plurality of leg portions 611 (FIGS. 4 and 6) that come into contact with the installation surface when installed in a normal position.

The pair of second connection parts 62A and 62B are respectively connected to the respective edges facing each other along the X-axis direction in the second fixed part 61, and from a part of each of the edges, in FIGS. It is comprised with the plate body hang | suspended toward the upper side.
More specifically, as shown in FIGS. 3 to 6, the pair of second connection portions 62A and 62B is configured by a plate body parallel to the YZ plane, like the pair of first connection portions 52A and 52B. ing.
And in the state which assembled the support tool 4, a pair of 2nd connection part 62A, 62B is located in the position which pinches | interposes a pair of 1st connection part 52A, 52B from the both sides of a X-axis direction.

In addition, since a pair of 2nd connection part 62A, 62B has the same function (The slit 621, the insertion hole 622 mentioned later, and the four positioning insertion holes 623A-623D), below, in FIG. The second connecting portion 62A located on the right side will be mainly described.
As shown in FIG. 4, the second connecting portion 62A has a substantially rectangular shape in plan view.
The second connecting portion 62A is formed with a slit 621, an insertion hole 622, and four positioning insertion holes 623A to 623D.

As shown in FIG. 4, the slit 621 extends from the −Z-axis side edge 624 of the second connection portion 62 </ b> A toward the position facing the mounting hole 521 in the assembled state of the support 4. Is formed.
As shown in FIG. 4, the insertion hole 622 is formed of a circular hole that penetrates the second connection portion 62 </ b> A along the X-axis direction and communicates with the slit 621, and the mounting hole in the assembled state of the support 4. It is formed at a position facing 521.
As shown in FIG. 4, the insertion hole 622 is formed so that the inner diameter dimension is larger than the width dimension of the slit 621.
As shown in FIGS. 3 to 6, the four positioning insertion holes 623 </ b> A to 623 </ b> D are holes that penetrate the second connecting portion 62 </ b> A along the X-axis direction and are inserted with positioning screws 8 described later.
The functions of the four positioning insertion holes 623A to 623D will be described later.

[Configuration of mounting screws]
The mounting screw 7 connects the first and second support members 5 and 6 and functions as a rotating shaft. The mounting screw 7 relatively rotates the first and second support members 5 and 6 around the rotation axis (X axis).
Specifically, the first and second projectors 2U and 2D fixed to the first and second support members 5 and 6 by connecting the first and second support members 5 and 6 with the mounting screw 7 Arranged as shown below.
The first projector 2U is arranged on the top surface 21A side of the second projector 2D as shown in FIGS.
Further, as shown in FIGS. 3 to 6, the first projector 2U is arranged such that the projection lens 223 faces the same side (+ Z axis side) as the projection lens 223 in the second projector 2D.

Further, the first projector 2U has the first position (FIG. 3) or the second position by the relative rotation of the first and second support members 5 and 6 with the mounting screw 7 as the rotation axis (X axis). (FIG. 5).
As shown in FIG. 3, the first position is such that the bottom surface 21B of the first projector 2U is close to the top surface 21A of the second projector 2D, and the first projector 2U is on the top surface 21A of the second projector 2D. It is a position that covers a part (region on the −Z axis side of the top surface 21A).
In other words, the first position is a position where the first and second projectors 2U and 2D are arranged in parallel along the thickness direction (the direction from the top surface 21A to the bottom surface 21B).

Then, as shown in FIG. 6, the first projector 2U is positioned at a position shifted to the −Z axis side with respect to the second projector 2D while being positioned at the first position. Arranged to be long.
In the state where the first projector 2U is positioned at the first position, the operation unit 212 in the second projector 2D is provided on the + Z axis side (front surface 21C side) of the top surface 21A as shown in FIG. Therefore, it is not covered by the first projector 2U.
As shown in FIG. 5, the second position is such that the bottom surface 21B of the first projector 2U is separated from the top surface 21A of the second projector 2D (the front surface 21C is separated from the second projector 2D). This is the position where the top surface 21A is opened.

[Configuration of positioning screw]
The positioning screw 8 includes four positioning screw holes 522A to 522D (FIG. 5) formed in the first support member 5 and four positioning insertion holes 623A to 623D (FIG. 5) formed in the second support member 6. 3 to 6) and a function of adjusting the rotation position of the first support member 5 relative to the second support member 6 (projection position of the first projector 2 </ b> U).
For example, as shown in FIG. 6, the first support member with respect to the second support member 6 is inserted by inserting the positioning screw 8 into the positioning insertion hole 623A and screwing the positioning screw 8 into the positioning screw hole 522A. The rotation of 5 is restricted.

In the present embodiment, the rotational position of the first support member 5 with respect to the second support member 6 is configured to be adjustable in four stages.
That is, when the positioning screw 8 is screwed using the positioning screw hole 522A and the positioning insertion hole 623A, the first support member 5 is defined at the first rotational position.
Similarly, when the positioning screw hole 522B and the positioning insertion hole 623B are used, the positioning screw hole 522C and the positioning insertion hole 623C are used, and the positioning screw hole 522D and the positioning insertion hole 623D are used. In this case, the first support member 5 is defined at the second to fourth rotational positions, respectively.
The rotation position of the first support member 5 relative to the second support member 6 is projected on the screen Sc by selecting a rotation position corresponding to the projection distance from the second projector 2D to the screen Sc (FIG. 1). The left-eye image and the right-eye image are set so as to be easily superimposed.
The support tool 4 described above is configured so that it can be installed on a ceiling or the like by being inverted upside down with respect to the normal installation in addition to the normal installation.

(Image display method)
Next, an image display method using the above-described projection system will be described.
FIG. 7 is a flowchart for explaining the image display method.
FIG. 8 is a diagram for explaining an image display method.
In the following description, the first and second projectors 2U and 2D, for example, recognize whether the above-described dip switch is ON or OFF, thereby determining whether the projector is the first projector or the second projector. It shall be recognized.
First, the user executes the following steps S1 and S2 as a preparation process.

In step S1, the user presses the operation button 211B of the first projector 2U.
In the first projector 2U, when the main control unit 241 recognizes that the operation button 211B has been pressed, the main control unit 241 outputs a control command to the display control unit 246.
In response to the control command from the main control unit 241, the display control unit 246 reads the first calibration image data corresponding to the first projector 2U from the memory 242 and sends the first calibration image to the light modulation device 222. Let it form.
Here, the first calibration image is an image composed of a blue rectangular frame.
On the screen Sc, as shown in FIG. 8A, the first calibration projection image C1 projected from the first projector 2U (according to the first calibration image formed by the light modulation device 222). Projected image) is displayed.

Although not shown in detail, the first and second projectors 2U and 2D are electrically connected by a signal cable that enables transmission and reception of predetermined signals.
When the operation button 211B of the first projector 2U is pressed, a predetermined signal is output from the first projector 2U to the second projector 2D via the signal cable.
In the second projector 2D, when recognizing the input of the signal from the first projector 2U, the main control unit 241 outputs a control command to the display control unit 246.
The display control unit 246 reads out second calibration image data corresponding to its own second projector 2D from the memory 242 in response to a control command from the main control unit 241, and sends the second calibration image to the light modulation device 222. Let it form.
Here, the second calibration image is an image composed of a red rectangular frame.
On the screen Sc, as shown in FIG. 8A, the second calibration projection image C2 projected from the second projector 2D (according to the second calibration image formed by the light modulation device 222). Projected image) is displayed.
In FIG. 8A, after the first and second calibration projection images C1 and C2 are displayed on the screen Sc, the second calibration projection image C2 projected from the second projector 2D has a rectangular shape. As shown, the position of the unit to which the first and second projectors 2U and 2D and the support 4 are fixed and the position of the screen Sc are adjusted by the user.

Here, the first and second calibration images formed on the respective light modulation devices 222 of the first and second projectors 2U and 2D are images composed of rectangular frames of the same size.
However, as described above, the first projector 2U is set such that the projection distance is longer than the projection distance of the second projector 2D. For this reason, the size of the first calibration projection image C1 on the screen Sc is larger than the size of the second calibration projection image C2, as shown in FIG.

In step S2, the user uses the positioning screw 8 to adjust the projection position of the first projector 2U (the display position of the first calibration projection image C1).
Specifically, as shown in FIG. 8B, the user sets the rotation position of the first support member 5 to the first position so that the second calibration projection image C2 enters the first calibration projection image C1. To any one of the fourth rotational positions.
Then, when the projection position of the first projector 2U is adjusted in step S2, the projection angle of the first calibration projection image C1 on the screen Sc is changed, so that the rectangular shape shown in FIG. It will be distorted into the trapezoidal shape shown in (B).

After the above preparation steps S1 and S2, the user presses the operation button 211B of the first projector 2U again.
In the first projector 2U, when the main control unit 241 recognizes that the operation button 211B is pressed again, the main control unit 241 controls the operation of the imaging device 23, causes the imaging device 23 to capture the screen Sc, and acquires the captured image (step S3). ).
As described above, the imaging device 23 is composed of a 3CCD camera. For this reason, the blue first projection image C1 for calibration is detected by the blue CCD in the imaging device 23 and is output to the control device 24 as a B signal. The red second projection image C2 for calibration is detected by the red CCD in the imaging device 23 and output to the control device 24 as an R signal.

The main control unit 241 recognizes the first and second calibration projection images C1 and C2 according to the B and R signals output from the imaging device 23. Further, the main control unit 241 calculates a coefficient for fitting the first calibration projection image C1 to the second calibration projection image C2 on the basis of the second calibration projection image C2, and performs display control of the coefficient. Part 246.
When the coefficient is set in the display control unit 246 as described above, the display control unit 246 uses the coefficient to perform three-dimensional processing on the pixel position information of the first calibration image data stored in the memory 242. By performing vector calculation, trapezoidal distortion correction is performed on the first calibration image data (step S4).
Then, by performing the trapezoidal distortion correction, the trapezoidal first projection image for calibration C1 shown in FIG. 8B (the first projection image for calibration shown by the two-dot chain line in FIG. 8C). C1) overlaps with the second calibration projection image C2, and is calibrated into a rectangular first calibration projection image C1 as shown by the solid line in FIG. 8C.

According to this embodiment described above, there are the following effects.
In the present embodiment, the projection system 1 includes a support 4.
Thus, the user can easily define the relative positional relationship between the first and second projectors 2U and 2D by supporting the first and second projectors 2U and 2D on the support 4.
Therefore, when the projection system 1 including the first and second projectors 2U and 2D is constructed, the projection system 1 can be easily constructed by using the support 4.

FIG. 9 is a diagram for explaining an effect in the present embodiment. Specifically, FIGS. 9A to 9C show configurations different from the present embodiment (the first projector 2U is not shifted to the −Z axis side with respect to the second projector 2D, and the first, In the configuration in which the projection distances of the second projectors 2U and 2D are set to be the same, steps S1, S2 and S4 are performed. 9A to 9C correspond to FIGS. 8A to 8C, respectively.
For example, when the projection distances of the first and second projectors 2U and 2D are set to be the same, the following problem occurs.

First, the first projector 2U projects a rectangular first calibration projection image C1 (a projection image having the same size as the second calibration projection image C2) before being superimposed on the second calibration projection image C2. The first posture (FIG. 9A) is the first posture, and the tilt is changed from the first posture and can be superimposed on the second calibration projection image C2. Assume that the posture when the camera is projecting is the second posture (FIG. 9B).
The first calibration projection image C1 that is rectangular in the first posture has a trapezoidal distortion in the second posture, but is corrected to a rectangular shape by performing the trapezoidal distortion correction (FIG. 9C). The calibrated rectangular first calibration projection image C1 is smaller in size than the first calibration projection image C1 (FIG. 9A) projected on the screen Sc in the first posture. .
That is, in the second projector 2D, as shown in FIGS. 9B and 9C, in accordance with the size of the first calibration projection image C1 whose size is reduced by the trapezoidal distortion correction in the first projector 2U. It is necessary to reduce the size of the second calibration projection image C2. Therefore, as shown in FIG. 9C, there is a problem that the size of the projection image PF on which the first and second calibration projection images C1 and C2 are superimposed is reduced.

In the present embodiment, the support 4 supports the first and second projectors 2U and 2D in a state where the projection distances of the first and second projectors 2U and 2D are different.
That is, the first projector 2U is set to have a longer projection distance than the second projector 2D. Therefore, when the first projector 2U is arranged in the first posture, the size of the rectangular first calibration projection image C1 projected on the screen Sc is larger than that of the second calibration projection image C2. It becomes large (FIG. 8 (A)). Similarly, by arranging the first projector 2U in the second posture, the size of the trapezoidal first calibration projection image C1 projected on the screen Sc is also larger than the second calibration projection image C2. (FIG. 8B).
Therefore, when the first calibration projection image C1 is superimposed on the rectangular second calibration projection image C2, the size of the first calibration projection image C1 projected on the screen Sc can be set large in advance. If the first calibration projection image C1 is calibrated to a rectangular shape by trapezoidal distortion correction in the projector 2U, the first and second calibration projection images C1 and C2 are reduced without reducing the size of the second calibration projection image C2. Can be overlapped. That is, the size of the rectangular projection image PF in which the first and second calibration projection images C1 and C2 are superimposed is not reduced.

Further, by shifting the first and second projectors 2U and 2D in the Z-axis direction, even if the first and second projectors 2U and 2D are not configured to support the first and second projectors with high accuracy, the projected images are superimposed with a simple configuration. PF can be prevented from becoming small.
Specifically, it is not necessary to finely adjust the positions of the first and second projectors 2U and 2D on the support 4 with screws or the like. Further, even if there is a dimensional variation in parts or an assembly variation, the first calibration projection image C1 can be surely superimposed on the second calibration projection image C2.

Further, the support 4 supports the first and second projectors 2U and 2D so that the first and second projectors 2U and 2D are juxtaposed along the thickness direction.
Accordingly, in the first and second projectors 2U and 2D, the projection lenses 223 can be positioned at close positions.
For example, when the projection lenses 223 are positioned at positions separated from each other, the projection angle of the image projected from the second projector 2D onto the screen Sc and the projection angle of the image projected from the first projector 2U onto the screen Sc. Are very different.

That is, in step S2, when the projection position of the first projector 2U is adjusted so that the second calibration projection image C2 falls within the first calibration projection image C1, the trapezoidal shape of the first calibration projection image C1 is obtained. The degree of distortion is greater when the projection lenses 223 are positioned at positions apart from each other than when the projection lenses 223 are positioned at close positions.
Therefore, by positioning the projection lenses 223 close to each other, the first calibration projection image C1 is superimposed on the second calibration projection image C2 while reducing the processing load when performing the trapezoidal distortion correction. Can do.
Further, by supporting the first and second projectors 2U and 2D with the support 4 as described above, the unit in which the first and second projectors 2U and 2D are integrated with the support 4 can be compactly gathered. Can do.

Furthermore, the operation unit 212 is provided in a region other than the region covered with the first projector 2U on the top surface 21A of the second projector 2D in a state where the first projector 2U is positioned at the first position.
Accordingly, even when the first projector 2U is positioned at the first position, the user can operate the operation unit 212, and the operability of the second projector 2D can be ensured.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment, the left eye image is projected with the first linearly polarized light from the first projector 2U, and the right eye image is projected with the second linearly polarized light from the second projector 2D, that is, the first and second linearly polarized lights are used. And although the projection image PF was stereoscopically viewed, it is not restricted to this.
For example, a configuration in which a projected image is stereoscopically viewed using counterclockwise circularly polarized light and clockwise circularly polarized light may be employed.
In such a configuration, the polarizing glasses 3 also correspond to the above configuration, and the left-eye transmission unit 31 transmits only one of the left-handed circularly polarized light and the right-handed circularly-polarized light, and the right-eye transmission unit 32. Is configured to transmit only the other.

In the above-described embodiment, the projection system 1 is a 3D projection system. However, the present invention is not limited thereto, and the configuration is such that the polarized glasses 3 are omitted and the same image is projected from the first and second projectors 2U and 2D. It doesn't matter.
In the said embodiment, although the support tool 4 arranged the 1st, 2nd projector 2U, 2D along the thickness direction, it is not restricted to this, Each projection distance of the 1st, 2nd projector 2U, 2D If they are in different states, for example, they may be arranged side by side in the X-axis direction.
In the embodiment, the support 4 is configured to support the two projectors of the first and second projectors 2U and 2D. However, the support tool 4 is not limited to this, and supports three or more projectors. You may comprise.
Even in the case where the support 4 is configured to support three or more projectors, as in the above-described embodiment, at least two projectors are used in a state where the projection distances of at least two projectors are different. It is preferable to be configured to support.

  The present invention can be used in a projection system including first and second projectors.

  DESCRIPTION OF SYMBOLS 1 ... Projection system, 2U ... 1st projector, 2D ... 2nd projector, 4 ... Supporting tool, 21A ... Top surface, 212 ... Operation part, PF ... Projection image , Sc... Screen (projected surface).

Claims (4)

A projection system comprising a first projector and a second projector, and displaying a projected image by superimposing images projected from the first projector and the second projector on a projection surface,
A support for supporting the first projector and the second projector;
The support is
The projection system, wherein the first projector and the second projector are supported in a state where projection distances from the first projector and the second projector to the projection surface are different. The projection system according to claim 1,
The support is
The projection system, wherein the first projector and the second projector are supported so that the first projector and the second projector are juxtaposed along the thickness direction. The projection system according to claim 2,
The first projector is
By being supported by the support tool, the second projector is disposed at a position covering a part of the top surface,
On the top surface of the second projector,
An operation unit for operating the second projector;
The operation unit is
It is provided in the area | region other than the area | region covered with the said 1st projector in the said top | upper surface. The projection system characterized by the above-mentioned. An image display method used in a projection system that displays a projected image by superimposing images projected from a first projector and a second projector on a projection surface,
The first projector and the second projector are:
Each projection distance from the first projector and the second projector to the projection surface is supported by a support tool,
The image display method is
Projecting on the projection surface from the projector having the longer projection distance on the basis of the image projected on the projection surface from the projector having the shorter projection distance of the first projector and the second projector. A method for displaying an image, comprising combining the images.

Images