JP6330937B2 - Multi-projector system, projector apparatus, adjustment apparatus and adjustment method, and adjustment program - Google Patents

Description

  The present invention relates to a multi-projector system, a projector device, an adjustment device, an adjustment method, and an adjustment program that are suitable for use when simultaneously projecting a plurality of projection images onto one projection medium.

  Conventionally, for example, when a projection image having a size larger than that of a projection image by a single projector device is required, a plurality of projection images by a plurality of projector devices are simultaneously projected on a single screen. A projected image was obtained. As an example, a horizontally long image is divided into left and right, and the divided images are adjacent to each other in the horizontal direction by using two projector apparatuses, and are projected onto one screen so as to form one continuous projection image as a whole. . At this time, an overlapping region may be provided in an adjacent portion of the projection image.

  In this way, when projecting images from a plurality of projector devices are projected on a single screen so that the projected images are continuous with each other, it is necessary to align the positions of the projected images between the plurality of projector devices. As a method for aligning the projection image, conventionally, each projection image projected on the projection medium is captured by a camera, the relative position of each projection image is recognized based on the captured image, and the position of each projection image is determined. The method of adjusting the is used.

  For example, Patent Document 1 discloses a technique for adjusting the projection position of each of a plurality of projector apparatuses based on captured images obtained by capturing each projection image projected on one projection medium by a plurality of projector apparatuses with a camera. ing. According to Patent Document 1, a plurality of projector apparatuses project a projection image in which a superimposed portion where the patterns are superimposed is white onto a projection medium so that the superimposed portion is generated in the mutual patterns. . Based on the captured image obtained by capturing the superimposed portion of the projected image with a camera, the positional relationship between the projected images is grasped.

JP 2007-043274 A

  However, the projection image alignment method according to the prior art has a problem in that the accuracy required for alignment may not be obtained when the resolution of the camera that captures the projection image is not sufficient. For example, when the camera does not have a resolution in pixel units for the projected image in the captured image, it is difficult to adjust the position of each projected image with high accuracy.

  The present invention has been made in view of the above, and an object of the present invention is to perform alignment of projected images between a plurality of projector apparatuses with higher accuracy.

    In order to solve the above-described problems and achieve the object, the present invention outputs two or more projection apparatuses including a first projection apparatus and a second projection apparatus, and outputs an image to each of the two or more projection apparatuses. An image output device; and an adjustment device that adjusts each projection position on the projection medium of a projection image projected by the two or more projection devices; a first projection image emitted by the first projection device; A multi-projector system that projects onto a projection medium so that the second projection image emitted by the second projection device has an overlapping area, wherein each of the projection devices receives light from a light source as an input image A light emitting unit that modulates and emits the projection image as a projection image, and an angle adjustment unit that adjusts an angle of the projection image emitted by the light emitting unit, and the image output device includes the first projection image. Corresponding to the overlap region In the region, the luminance is in a region corresponding to the overlap region of the first adjustment image in which the first gradation region in which the luminance is inclined in the first direction and the second projection image is formed. A second adjustment image that is inclined in a second direction opposite to the first direction and has a second gradation area formed at a position corresponding to the first gradation area; An output unit that outputs the first projection device and the input image of the second projection device, respectively, and the adjustment device captures the projection image projected on the projection medium and outputs the captured image. A first adjustment projection image that the first projection device projects on the projection target medium based on the first adjustment image, and the second projection device Based on the second adjustment image, the projection medium A luminance change in a direction perpendicular to the first direction is acquired in a region where the first gradation region and the second gradation region included in the overlapping region with the projected second adjustment projection image are overlapped. An analysis unit that performs, and a control unit that outputs a first control signal for controlling the angle adjustment unit of the projection device so that the luminance change acquired by the analysis unit is within a predetermined range; There is provided a multi-projector system characterized by comprising:

  According to the present invention, there is an effect that the alignment of the projected image between the plurality of projector apparatuses can be performed with higher accuracy.

FIG. 1 is a block diagram schematically showing a multi-projector system according to the first embodiment. FIG. 2 is a diagram for explaining a method for adjusting the emission position of the projection light according to the first embodiment. FIG. 3 is a diagram for explaining alignment using a gradation image according to the first embodiment. FIG. 4 is a diagram for explaining alignment using a gradation image according to the first embodiment. FIG. 5 is a block diagram showing in more detail the configuration of an example of the multi-projector system according to the first embodiment. FIG. 6 is a flowchart illustrating an example of the alignment process according to the first embodiment. FIG. 7 is a flowchart showing in more detail the alignment process according to the first embodiment. FIG. 8 is a diagram for explaining a method of acquiring a luminance change in the horizontal direction according to the first embodiment. FIG. 9 is a diagram for explaining a method of acquiring a luminance change in the vertical direction according to the first embodiment. FIG. 10 is a flowchart illustrating an example of horizontal movement processing of the injection position according to the first embodiment. FIG. 11 is a diagram for explaining a process of moving the injection position in the horizontal direction according to the first embodiment. FIG. 12 is a diagram illustrating an example of a change in luminance when a region in which gradation regions whose luminance is inclined in the vertical direction is overlapped is scanned in the vertical direction. FIG. 13 is a diagram illustrating an example of an adjustment projection image according to the first modification of the first embodiment. FIG. 14 is a diagram illustrating an example of an adjustment projection image according to a second modification of the first embodiment. FIG. 15 is a block diagram showing a configuration of an example of a multi-projector system according to the second embodiment. FIG. 16 is a block diagram illustrating an exemplary configuration of a multi-projector system according to the third embodiment. FIG. 17 is a diagram illustrating an example of the shift of the projection image of the multi-projector system according to the third embodiment. FIG. 18 is a block diagram schematically showing a multi-projector system according to the fourth embodiment. FIG. 19 is a diagram for explaining a method for adjusting the angle of a projection image according to the fourth embodiment. FIG. 20 is a diagram for explaining in more detail the method for determining the presence or absence of rotation of the projection image according to the fourth embodiment. FIG. 21 is a diagram illustrating an example of a luminance change detected when the adjustment region is rotating. FIG. 22 is a block diagram showing in more detail the configuration of an example of the multi-projector system according to the fourth embodiment. FIG. 23 is a flowchart illustrating an example of the alignment process according to the fourth embodiment. FIG. 24 is a flowchart illustrating an example of an angle adjustment process according to the fourth embodiment. FIG. 25 is a diagram for explaining a projection image angle adjustment method according to the fifth embodiment. FIG. 26 is a diagram for explaining a method for determining the presence or absence of rotation of a projection image according to the fifth embodiment. FIG. 27 is a diagram for explaining a luminance acquisition position when an overlapping region is scanned according to the fifth embodiment. FIG. 28 is a diagram illustrating an example of an adjustment projection image according to the first modification of the fifth embodiment. FIG. 29 is a diagram illustrating a first example of the adjustment projection image in the second modification example of the fifth embodiment. FIG. 30 is a diagram illustrating a second example of the adjustment projection image according to the second modification example of the fifth embodiment.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a multi-projector system, a projector device, an adjustment device and an adjustment method, and an adjustment program according to the present invention will be described below with reference to the drawings. Specific numerical values and appearance configurations shown in the embodiments are merely examples for facilitating understanding of the present invention, and do not limit the present invention unless otherwise specified. Detailed explanation and illustration of elements not directly related to the present invention are omitted.

(First embodiment)
FIG. 1 schematically shows a multi-projector system according to the first embodiment. A multi-projector system 1 shown in FIG. 1 includes a plurality of projector devices (PJ) 10 ₁ and 10 ₂ , an image output device 11, an adjustment device 12, and a camera 13.

The image output device 11 outputs image data to each of the projector devices 10 ₁ and 10 ₂ . Each of the projector devices 10 ₁ and 10 ₂ inputs the image data output from the image output device 11 as input image data. Each of the projector devices 10 ₁ and 10 ₂ performs predetermined image processing on the input image data to generate projection image data, and modulates and projects the light from the light source based on the projection image data by the light modulator. Images are projected onto the screen 14 as images 20 ₁ and 20 ₂ . It is assumed that projector apparatuses 10 ₁ and 10 ₂ are installed horizontally.

Here, the two projector apparatuses 10 ₁ and 10 ₂ project the projected images 20 ₁ and 20 ₂ onto the common screen 14 so that the ends facing each other overlap each other with a predetermined width. At this time, a portion where the projection image 20 ₁ and the projection image 20 ₂ overlap is referred to as an overlapping region 21.

As described above, when the two projected images 20 ₁ and 20 ₂ are projected side by side on the single screen 14, the two projector apparatuses 10 ₁ and 10 ₂ are overlapped at the joint portion of the projected images 20 ₁ and 20 _2. 21 is projected onto the screen 14. At this time, each of the projection images 20 ₁ and 20 _{2 is} arranged in the area corresponding to the overlapping area 21 with the same image having a half luminance. Thereby, the two projected images 20 ₁ and 20 ₂ are projected onto the screen 14 as if they were one continuous large projected image.

In this case, the projector devices 10 ₁ and 10 ₂ need to project the projected images 20 ₁ and 20 ₂ on the screen 14 at the correct positions. More specifically, the projector devices 10 ₁ and 10 ₂ adjust the projection positions of the projection images 20 ₁ and 20 ₂ on the screen 14 in the horizontal direction and the vertical direction, respectively, so that the projection images 20 ₁ and a position area corresponding to the overlapping area 21 is projected, a region corresponding to the overlap region 21 in the projected image 20 ₂ to match the position to be projected.

Hereinafter, the positional relationship between the projected image 20 ₁ and 20 ₂ in the case where a position corresponding region to the overlapping region 21 between the projected image 20 ₁ and the projection image 20 ₂ is projected is matched, as appropriate, referred to as the correct positional relationship.

Here, it is preferable to adjust the projection positions of the projection images 20 ₁ and 20 ₂ in units of pixels. For example, when one continuous image is divided into two images and projected as projected images 20 ₁ and 20 ₂ , if the positions of both are shifted by one pixel in the horizontal and vertical directions, the projected image is generated at that portion. May become discontinuous and give an uncomfortable appearance.

In the multi-projector system 1 according to the first embodiment, when the projector devices 10 ₁ and 10 ₂ project the projection images 20 ₁ and 20 ₂ onto the screen 14, the projection images 20 ₁ and 20 ₂ have an overlapping region 21. In this manner, the positions of the projection images 20 ₁ and 20 ₂ are determined. Then, based on the results of the camera 13 to the multi-projector system 1 has is taking an image including the overlapping area 21 on the screen 14, were analyzed captured image data obtained by imaging by the adjustment device 12, the projected image 20 ₁ and The emission position of the projection light by the projector apparatuses 10 ₁ and 10 ₂ is adjusted so that 20 ₂ is projected to the correct position. The projection position of the projection image is adjusted by adjusting the emission position of the projection light.

A method for adjusting the emission position of the projection light according to the first embodiment will be schematically described with reference to FIG. In the following, it is assumed that the projector devices 10 ₁ and 10 ₂ project the respective projected images side by side with respect to the screen 14 in the horizontal direction. For convenience, the projector apparatus 10 ₁ projects a first projected image on the left side of the screen 14, the projector apparatus 10 ₂ is intended to project a second projection image on the right side of the screen 14. Therefore, a part of the right end of the first projection image by the projector device 10 ₁ and a part of the left end of the second projection image by the projector device 10 ₂ are overlapped on the screen 14 to form an overlapping region. become.

In the multi-projector system 1 according to the first embodiment, the image output device 11 outputs image data for alignment for each of the projector devices 10 ₁ and 10 ₂ . FIG. 2A and FIG. 2B show examples of projected images based on the image data for alignment. FIG. 2A shows an example of a projection image 30 ₁ (referred to as an adjustment projection image 30 ₁ ) based on the alignment image data output for the projector device 10 ₁ . FIG. 2B shows an example of a projection image 30 ₂ (referred to as an adjustment projection image 30 ₂ ) based on image data for alignment output for the projector device 10 ₂ .

  In FIGS. 2A and 2B and the subsequent similar drawings, the vertical direction is the vertical direction (V) of the image, and the horizontal direction is the horizontal direction (H) of the image.

And the adjustment projection image 30 ₁ shown in FIG. 2 (a), adjusting the projected image 30 ₂ shown in FIG. 2 (b), are superimposed and the right end portion and left end portion, is projected onto the screen 14. FIG. 2C shows an example in which the adjustment projection image 30 ₁ and the adjustment projection image 30 ₂ are projected in an overlapping manner. In FIG. 2C, a portion where the adjustment projection images 30 ₁ and 30 ₂ are overlapped is shown as an overlapping region 33 ′. Further, from the left end of the adjustment projection image 30 ₁ is projected on the screen 14, a projection image including the to the right end of the adjustment projected image 30 _2, referred to as a whole projected image 300.

In Figure 2 the adjustment projection image 30 ₁ illustrated (a), the region 33 ₁ corresponding to the overlapping region 33 'comprises two regions 310 and 311. The region 310 is a gradation image in which the luminance decreases in a vertical direction from the top to the bottom as indicated by arrows in the drawing. The area 311 is a gradation image in which the luminance decreases with a certain inclination from the left side to the right side of the figure in the direction intersecting the gradient direction of the gradation of the gradation of the area 310 (see the arrow in the figure). It has become.

  Here, the maximum luminance and the minimum luminance due to gradation are respectively the maximum luminance and the minimum luminance in the image data. As an example, when the bit depth of each pixel constituting the image data is 8 bits, the luminance value of the maximum luminance is 255, the luminance value of the minimum luminance is 0, and the luminance is decreased from the luminance value 255 to the luminance value 0 by gradation. To do. Further, it is assumed that the luminance gradient in the gradation is linear function. Hereinafter, the area 310 and the area 311 including the gradation by luminance are referred to as the gradation area 310 and the gradation area 311, respectively.

In adjusting the projection image 30 _1, area 312 other than the gradation areas 310 and 311, the luminance value is the maximum luminance of the image data. Although details will be described later, the luminance of the region 312 serves as a reference when performing the alignment process, and hence the region 312 will be referred to as a reference region 312 below.

In the adjustment projection image 30 ₂ illustrated in FIG. 2B, the region 33 ₂ corresponding to the overlapping region 33 ′ includes two regions 320 and 321. These regions 320 and 321 are gradation regions having luminance gradients in opposite directions to the gradation regions 310 and 311 described above. That is, the gradation area 320 is a gradation image in which the luminance decreases at a constant inclination from the bottom to the top, as indicated by arrows in the drawing. Further, the gradation area 321 is a gradation image in which the luminance decreases with a certain inclination from the right to the left in the figure in a direction intersecting with the gradation inclination direction of the gradation of the area 320.

  Further, the brightness value of the area 322 other than the gradation areas 320 and 321 is the maximum brightness of the image data. The region 322 is a reference region 322 that serves as a reference when performing the alignment process.

  Note that the direction of decrease in luminance in the region 311 and the direction of decrease in luminance in the region 310 are preferably orthogonal to each other. Further, the direction of the luminance gradient in the region 310 is not necessarily the vertical direction. In the following description, it is assumed that the luminance decreasing direction in the region 311 and the luminance decreasing direction in the region 310 are orthogonal, and the luminance gradient direction in the region 310 is the vertical direction.

Thus, the projector apparatuses 10 ₁ and 10 ₂ project the adjustment projection images 30 ₁ and 30 ₂ thus configured onto the screen 14 with the areas 33 ₁ and 33 ₂ overlapped. Then, the image of the gradation area 310 and the image of the gradation area 320 are combined to form an image of the area 330 shown in FIG. Similarly, the image of the gradation area 311 and the image of the gradation area 321 are combined to form an image of the area 331 shown in FIG. That is, in the regions 330 and 331, gradation images whose luminances are inclined in opposite directions are synthesized.

At this time, if the projection position of the adjustment projection image 30 _{1 and} the projection position of the adjustment projection image 30 ₂ are in the correct positional relationship, the brightness of each of the areas 330 and 331 is increased to the area 312 and the surrounding area of the overlapping area 33 ′. A projection image having the same luminance as that of 322 and a uniform luminance as a whole is obtained. On the other hand, when the projection positions of the adjustment projection images 30 ₁ and 30 ₂ are not in the correct positional relationship, the luminance of the regions 330 and 331 is different from the luminance of the regions 312 and 322 around the overlapping region 33 ′, and the luminance is low. The projected image is not uniform.

In the first embodiment, based on the difference between the brightness of each of the areas 330 and 331 and the brightness of the reference area 312 or 322, the projection position of the projection image by the projector devices 10 ₁ and 10 ₂ is adjusted, and the projector The projection image by the apparatus 10 ₁ and the projection image by the projector apparatus 10 ₂ are aligned.

The alignment using the gradation image according to the first embodiment will be schematically described with reference to FIGS. 3 and 4. 3 (a) is the adjustment projection image 30 ₁ shown in FIG. 2 (a), showing an example of the horizontal direction of the luminance changes including gradation area 311. 3 (a), the position a indicates the boundary between the gradation region 311 and region 312, position b shows the right end i.e. the right end of the adjustment projected image 30 ₁ of the gradation region 311. Therefore, the distance D between the position a and the position b indicates the width in the horizontal direction of the overlapping region 33 ′. The brightness of the area 312 is assumed to be brightness L ₁ . As indicated by a line 341, the luminance decreases at a predetermined inclination from the luminance L ₁ to the luminance L ₀ at the distance D from the position a to the position b.

FIG. 3 (b), the adjustment projected image 30 ₂ shown in FIG. 2 (b), showing an example of the horizontal direction of the luminance changes including gradation area 321. 3 (b), the position c shows the left i.e. the left end of the adjustment projected image 30 ₂ of the gradation region 321, the position d indicates the boundary between the gradation region 321 and region 322. The brightness of the area 322 is set to the brightness L ₁ as in the area 312. In this example, as indicated by a line 342, the luminance increases at a predetermined inclination from the luminance L ₀ to the luminance L ₁ at the distance D from the position c to the position d.

FIG. 4 shows an example of a change in luminance in the horizontal direction when the regions 33 ₁ and 33 ₂ of the adjustment projection images 30 ₁ and 30 ₂ are overlapped. FIG. 4A shows an example of a luminance change when the region 33 ₁ and the region 33 ₂ are overlapped in the correct positional relationship with their positions aligned in the horizontal direction as a line 343A. In this way, when the maximum and minimum luminance values are the same in two gradations having opposite luminance gradients, the luminance is at the center of each gradient, that is, at a position where the luminance is ½ of the maximum value. By superimposing the adjustment projection images 30 ₁ and 30 ₂ so as to match each other, it is possible to obtain a projection image having a maximum luminance (luminance L ₁ ) and no luminance change as a whole.

FIG. 4B shows an example of a luminance change when the region 33 ₁ and the region 33 ₂ are overlapped with a distance from the correct positional relationship. In this case, the luminances of the region 33 ₁ and the region 33 ₂ coincide with each other at a position where the luminance is less than ½ of the maximum value in the gradients of the two gradations. Therefore, as illustrated in the line 343B, the portion inclined portion of the lines 341 and 342 overlap each other, the brightness of the projected image is less than the luminance L _1, the luminance L ₁ than the surrounding (region 312 and 322) The brightness becomes darker by the difference luminance ΔL.

FIG. 4C shows an example of a luminance change when the region 33 ₁ and the region 33 ₂ are overlapped with each other close to the correct positional relationship. In this case, the luminances of the region 33 ₁ and the region 33 ₂ coincide with each other at a position where the luminance exceeds 1/2 of the maximum value in the gradients of the two gradations. Therefore, as illustrated in the line 343C, the portion inclined portion of the lines 341 and 342 overlap each other, the brightness of the projection image exceeds a luminance L _1, the luminance L ₁ than the surrounding (region 312 and 322) The brightness is increased by the difference luminance ΔL.

Thus, according to the first embodiment, since the direction of the mutually brightness slope in the _second region 33 ₁ and the region 33 are provided a reverse gradient regions were overlapped and the region 33 ₁ and the area 33 ₂ The difference in position appears as the luminance of the overlapping region 33 ′ where the region 33 ₁ and the region 33 ₂ are overlapped. In the first embodiment, the emission position of the projection light projected by the projector devices 10 ₁ and 10 ₂ is adjusted by acquiring the luminance of the overlapping region 33 ′.

  FIG. 5 shows the configuration of an example of the multi-projector system 1 according to the first embodiment in more detail. In FIG. 5, parts common to those in FIG. 1 described above are denoted by the same reference numerals, and detailed description thereof is omitted.

The image output device 11 includes an image output unit 110. The image output unit 110 outputs the adjustment image data for projecting the adjustment projection images 30 ₁ and 30 ₂ described above. Each image data for adjustment is supplied as input image data to the projector devices 10 ₁ and 10 ₂ .

The image output unit 110 may generate and output image data for adjustment by a predetermined program or the like, or may read and output projection image data stored in advance in a ROM (Read Only Memory) or the like. . Further, in FIG. 5, the image output device 11 is shown as a configuration common to the projector devices 10 ₁ and 10 ₂ , but this is not limited to this example, and for each of the projector devices 10 ₁ and 10 ₂ , An image output device 11 may be provided.

The projector apparatus 10 ₁ includes an image processing unit 100 ₁ , an image display device 101 ₁ , a light source 102 ₁ , an illumination optical system 103 ₁ , a projection optical system 104 _1, and a lens shift unit 105 ₁ . Similarly, the projector apparatus 10 ₂ includes an image processing unit 100 ₂ , an image display device 101 ₂ , a light source 102 ₂ , an illumination optical system 103 ₂ , a projection optical system 104 _2, and a lens shift unit 105 _2. . Thus, since the projector apparatuses 10 ₁ and 10 ₂ can be realized with a common configuration, the projector apparatus 10 ₁ will be described below as an example.

In the projector apparatus 10 ₁ , light emitted from the light source 102 ₁ enters the image display device 101 ₁ via the illumination optical system 103 ₁ . The image processing unit 100 ₁ performs predetermined image processing on the input image data input to the projector device 10 _1, and outputs it to the image display device 101 ₁ as projection image data.

The image display device 101 ₁ is, for example, an LCOS (Liquid crystal on silicon), and emits the modulated incident light in accordance with image data. The image display device 101 ₁ modulates and emits the light incident from the illumination optical system 103 ₁ according to the projection image data supplied from the image processing unit 100 ₁ . The light emitted from the image display device 101 ₁ is projected as a projection image onto the screen 14 via the projection optical system 104 ₁ and the lens shift unit 105 ₁ . When the input image data input to the image processing unit 100 ₁ is image data for projecting the adjustment projection image 30 ₁ output from the image output device 11, the adjustment projection image 30 is applied to the screen 14. ₁ is projected.

The lens shift unit 105 ₁ can move the optical axis of the light emitted from the projection optical system 104 ₁ in the horizontal direction and the vertical direction in accordance with a control signal from the control unit 121 described later. By moving the optical axis of the light emitted by the lens shift section 105 ₁ from the projection optical system 104 _1, it is possible to adjust the position of the projection image is projected onto the screen 14.

Similarly, the projection image 30 ₂ for adjustment is projected on the screen 14 from the projector device 10 ₂ . At this time, the adjustment projection images 30 ₁ and 30 ₂ are projected onto the screen 14 so that an overlapping region 33 ′ is formed.

  The adjustment device 12 includes an analysis unit 120 and a control unit 121. The analysis unit 120 analyzes the captured image data captured by the camera 13 so as to include, for example, the entire projected image 300 on the screen 14, and obtains the luminance change in the above-described regions 330 and 331. The analysis unit 120 supplies information indicating the obtained luminance change to the control unit 121.

The control unit 121 adjusts the projection position of the adjustment projection images 30 ₁ and 30 ₂ , that is, the emission position of the projection image by the projector devices 10 ₁ and 10 ₂ , based on the information indicating the luminance change supplied from the analysis unit 120. A control signal for generating Control signal for adjusting the injection position of the projector apparatus 10 ₁ is supplied to the lens shift section 105 ₁ of the projector apparatus 10 _1. The control for adjusting the injection position of the projector apparatus 10 ₂ signal is supplied to the lens shift 105 ₂ of the projector apparatus 10 _2.

Next, the alignment process executed by the above-described configuration will be described. FIG. 6 is a flowchart illustrating an example of the alignment process according to the first embodiment. In the following description, the projector apparatuses 10 ₁ and 10 ₂ arrange the projection images 20 ₁ and 20 ₂ in the horizontal direction and project them onto the screen 14, and the projection image 20 ₁ is arranged on the left side and the projection image 20 ₂ is arranged on the right side. Shall be. In the alignment process, the adjustment projection images 30 ₁ and 30 ₂ described with reference to FIGS. 2A and 2B are used.

In FIG. 6, in step S10, the projection images for adjustment 30 ₁ and 30 ₂ are respectively displayed on the screen 14 by _two projector apparatuses 10 ₁ and 10 ₂ (indicated as projectors PJ # 1 and PJ # 2 respectively). Projected. At this time, the positions of the projector devices 10 ₁ and 10 ₂ , for example, visually check the projection image on the screen 14 so that the image on the screen 14 by the adjustment projection images 30 ₁ and 30 ₂ has an overlapping region 33 ′. Adjust while checking. Therefore, the adjustment projection images 30 ₁ and 30 ₂ may be projected with a deviation from the correct positional relationship.

In the next step S <b> 11, the camera 13 captures a projection image on the screen 14. The camera 13 includes the captured image the entire adjustment projected image 30 ₁ and 30 ₂ on at least the screen 14, and the distortion of the subject image is captured so as not to generate by tilt angle. The captured image is supplied to the adjustment device 12 and input to the analysis unit 120.

  In the next step S12, the analysis unit 120 analyzes the input captured image, and the luminance in the region 330 in which the gradation regions 310 and 320 are overlapped as shown in FIG. The luminance in the region 331 where the 321 is overlapped is obtained. Further, the analysis unit 120 obtains the luminance of at least one of the regions 312 and 322 outside the overlapping region 33 '. The analysis unit 120 supplies information indicating the obtained luminance to the control unit 121.

Based on the luminances supplied from the analysis unit 120, the control unit 121 adjusts the projection images of the projector devices 10 ₁ and 10 ₂ so that the luminances in the regions 330 and 331 are equal to the luminances outside the overlapping region 33 ′. A control signal for adjusting the injection position is generated. The generated control signal is supplied for example to the lens shift section 105 ₁ of the projector apparatus 10 _1.

Not limited thereto, the control signal to the may be supplied to the lens shift section 105 ₂ of the projector apparatus 10 _2, may be supplied respectively to the lens shift section 105 ₁ and 105 _2.

In accordance with the supplied control signal, the lens shift unit 105 ₁ moves the optical axis of the emitted light in the horizontal direction and the vertical direction, and adjusts the emission position of the projection image. As a result, the positional relationship between the adjustment projection images 30 ₁ and 30 ₂ projected on the screen 14 is corrected to the correct positional relationship.

  FIG. 7 is a flowchart showing the process of step S12 of FIG. 6 in more detail. In step S <b> 100, the analysis unit 120 obtains the luminance change in the horizontal direction including the region 331 and obtains the luminance of the region 331. As an example, as illustrated in FIG. 8, the analysis unit 120 includes a region 331, a region 312, and a region in the entire projection image 300 included in the captured image supplied from the camera 13 as indicated by an arrow A. The pixels are scanned in the horizontal direction so as to include at least one of the pixels 322, and the luminance value of each pixel is obtained.

  At this time, the analysis unit 120 may scan only one line, or may scan several lines and average the luminance values of the pixels corresponding to the positions in the vertical direction. The analysis unit 120 supplies the luminance value of each pixel obtained by scanning to the control unit 121.

In the next step S101, the control unit 121 calculates a horizontal position adjustment amount with respect to the emission position of the projection image based on the luminance value of each pixel supplied from the analysis unit 120. Then, the control unit 121 generates a control signal for moving the optical axis in the horizontal direction in the lens shift unit 105 ₁ based on the calculated position adjustment amount. The control unit 121 supplies the generated control signal to the lens shift unit 105 ₁ . Thus, the optical axis in the lens shift section 105 ₁ is moved in the horizontal direction, the projection position in the horizontal direction is adjusted.

  Note that the control unit 121 stores the luminance value acquired from the region 312 or the region 322 in a register or the like.

  In the next step S <b> 102, the analysis unit 120 obtains the luminance change in the vertical direction including the region 330 and obtains the luminance of the region 330. More specifically, as illustrated in FIG. 9, the analysis unit 120 includes a region 330 as indicated by an arrow B in the entire projection image 300 included in the captured image supplied from the camera 13. The pixels are scanned in the vertical direction to obtain the luminance value of each pixel.

  At this time, the analysis unit 120 may scan only one line, or may scan several lines and average the luminance values of the pixels corresponding to the positions in the horizontal direction. The analysis unit 120 supplies the luminance value of each pixel obtained by scanning to the control unit 121.

In the next step S103, the control unit 121 determines the emission position of the projection image based on the luminance value of each pixel supplied from the analysis unit 120 and the luminance value of the pixel in the region 312 or 322 stored in step S101. The position adjustment amount in the vertical direction with respect to is calculated. The control unit 121 generates a control signal for moving the optical axis in the vertical direction in the lens shift unit 105 ₁ based on the calculated position adjustment amount. The control unit 121 supplies the generated control signal to the lens shift unit 105 ₁ . Thus, the optical axis in the lens shift section 105 ₁ is moved in the vertical direction, the projection position in the vertical direction is adjusted.

In the above description, the adjustment of the injection position in the horizontal direction and the adjustment of the injection position in the vertical position are performed separately in steps S101 and S103, but this is not limited to this example. For example, the control unit 121 obtains the luminance change in the vertical direction by the process in step S102 after obtaining the luminance change in the horizontal direction by the process in step S100, and the lens shift unit based on the obtained luminance change in the horizontal and vertical directions. 105 ₁ may generate a control signal for moving the optical axis respectively horizontal and vertical directions at. In addition, after the process of step S101, the projection image may be captured again by the camera 13, and the processes after step S102 may be performed based on the recaptured captured image.

  The process of the control unit 21 in step S101 will be described in more detail with reference to FIGS. 11 (a), 11 (b), and 11 (c) correspond to FIGS. 4 (a), 4 (b), and 4 (c), respectively. Portions corresponding to 4 (a), FIG. 4 (b), and FIG. 4 (c) are denoted by the same reference numerals, and detailed description thereof is omitted.

In the flowchart of FIG. 10, in step S110, the control unit 121 determines whether or not the luminance value of each pixel supplied from the analysis unit 120 is changing in the horizontal direction. The control unit 121 determines that the luminance value has not changed when all of the luminance values of the pixels supplied from the analyzing unit 120 are within a predetermined range. In this case, as indicated by line 343A in FIG. 11 (a), as a whole a luminance value is constant, it can be determined that the adjustment projection image 30 ₁ and 30 ₂ are projected in the correct positional relationship. Therefore, the control unit 121, without generating a control signal of the optical axis movement with respect to the lens shift section 105 _1, and ends the series of processing in the flowchart of FIG. 10.

On the other hand, if the control unit 121 determines in step S110 that the luminance value of each pixel supplied from the analysis unit 120 has changed in the horizontal direction, the control unit 121 shifts the processing to step S111. In step S <b> 111, the control unit 121 acquires a reference luminance value L ₁ from the luminance value of each pixel supplied from the analysis unit 120. For example, the control unit 121 acquires the pixel value of a pixel at a predetermined position in the reference region 312 or 322 in the horizontal direction as the reference luminance value L ₁ . The control unit 121 stores the acquired luminance value L ₁ in a register or the like.

In the next step S112, the control unit 121 obtains the brightness value L ₂ of the central portion of the change in luminance value. Control unit 121, for example, the pixel values of the pixels in the central portion of the horizontal direction, may be obtained as the luminance value L ₂ of the central portion of the change in the luminance value, and detecting a change in each pixel of the luminance values, the luminance value L ₂ of the central portion of the change may be acquired.

In the next step S113, the control unit 121 subtracts the luminance value L ₂ of the brightness value L _1, obtains the difference luminance ΔL of the luminance value L ₁ and the luminance value L _2. Here, it is assumed that the control unit 121 obtains the difference luminance ΔL by subtracting the luminance value L ₂ from the luminance value L ₁ .

  In the next step S114, the control unit 121 determines whether or not the difference luminance ΔL exceeds zero. If it is determined that the difference luminance ΔL exceeds 0, the control unit 121 shifts the process to step S115.

In step S115, the control unit 121 calculates a deviation amount ΔD with respect to the correct positional relationship between the projection positions of the adjustment projection images 30 ₁ and 30 ₂ from the difference luminance ΔL obtained in step S113. Based on the calculated shift amount ΔD, the control unit 121 generates a control signal for the lens shift unit 105 ₁ for moving the projection positions of the adjustment projection images 30 ₁ and 30 ₂ by the shift amount ΔD. Control unit 121 supplies the generated control signal to the lens shift section 105 _1, and ends the series of processing in the flowchart of FIG 10.

On the other hand, when the control unit 121 determines in step S114 described above that the difference luminance ΔL is less than 0, the control unit 121 shifts the processing to step S116. In step S116, the control unit 121 calculates a deviation amount ΔD with respect to the correct positional relationship between the projection positions of the adjustment projection images 30 ₁ and 30 ₂ from the difference luminance ΔL obtained in step S113. Then, based on the calculated shift amount ΔD, the control unit 121 generates a control signal for the lens shift unit 105 ₁ to bring the projection positions of the adjustment projection images 30 ₁ and 30 ₂ closer by the shift amount ΔD. Control unit 121 supplies the generated control signal to the lens shift section 105 _1, and ends the series of processing in the flowchart of FIG 10.

  Note that the case where it is determined in step S110 described above that there is no luminance change corresponds to an example in which the difference luminance ΔL is zero.

The processes in steps S115 and S116 described above will be described in more detail with reference to FIG. Case difference luminance ΔL exceeds 0 corresponds to the example of FIG. 11 (c), the further approach direction to the projection position is correct positional relationship of the adjusting projection image 30 ₁ and 30 _2, shifted by shift amount ΔD It shows that. Further, the case where the difference luminance ΔL is less than 0 corresponds to the example of FIG. 11B, and only the deviation amount ΔD is in the direction in which the projection positions of the adjustment projection images 30 ₁ and 30 ₂ move away from the correct positional relationship. It shows that it has shifted.

  This deviation amount ΔD is obtained as follows.

In the gradation, the distance in which the luminance changes from the maximum luminance L ₁ to the minimum luminance L ₀ (= 0) is defined as the distance D, and the gradation of 2 having the same luminance L ₁ , luminance L _0, and distance D and having the opposite slope is The positions of the luminance L ₁ and the luminance L ₀ are overlapped with each other. At this time, it is assumed that the position of the superimposed two gradations is shifted by a shift amount ΔD. In this case, the combined luminance obtained by combining the luminances of the two gradations in the range in which the position of the luminance L ₁ of _one gradation or the position of the luminance L ₀ is included in the inclination range of the other gradation is defined as the luminance L ₂ . . Further, the difference between the luminance L ₁ and the luminance L ₂ is defined as a difference luminance ΔL.

In this case, if the gradient of luminance due to gradation is a linear function, as can be seen from FIGS. 11 (b) and 11 (c), the ratio between the deviation amount ΔD and the distance D, the difference luminance ΔL, and the luminance L The ratio with ₁ is equal. The relationship between the values based on this ratio is shown in the following formula (1).
ΔD / D = ΔL / L ₁ (1)

Solving this equation (1) with respect to the deviation amount ΔD, the following equation (2) is obtained, and it can be seen that the deviation amount ΔD can be calculated based on the difference luminance ΔL when the distance D and the luminance L ₁ are known.
ΔD = (ΔL / L ₁ ) × D (2)

Note that the distance D corresponds to the width of the luminance gradient in the gradation regions 311 and 321 as described above. In this example, the distance D is equal to the width of the overlapping region 33 ′ when the projection positions of the adjustment projection images 30 ₁ and 30 ₂ are in the correct positional relationship.

Here, when the distance D described above is represented by the number of pixels, if the luminance resolution in the camera 13 is 1 / D or more, the shift amount ΔD can be obtained in units of pixels. This point will be described. When the above equation (1) is solved for the difference luminance ΔL, the following equation (3) is obtained.
ΔL = (ΔD / D) × L ₁ (3)

In equation (3), if the amount of deviation ΔD is one pixel, the following equation (4) is obtained, and the change in luminance with respect to the deviation of one pixel is a value obtained by dividing luminance L ₁ by distance D. Accordingly, if the resolution with respect to the luminance L ₁ is 1 / D or more, a shift of one pixel can be recognized.
ΔL = L ₁ / D (4)

  The resolution of the brightness of the camera 13 corresponds to the bit depth of the pixel handled by the camera 13, and when the pixel bit depth is 8 bits, the resolution is 1/256. Similarly, if the pixel bit depth is 10 bits, 12 bits,..., The resolution is 1/1024, 1/44096, or the like.

For example, if the horizontal width of 64 pixels or distance D = 64 pixels in the overlap region 33 ', if the projection position of the adjustment projected image 30 ₁ and 30 ₂ is shifted by one pixel from the correct positional relationship ([Delta] D = 1) If the luminance resolution of the camera 13 is 1/64 or more according to the above equation (4), this deviation can be recognized. As already described, even with a camera in which the bit depth of a pixel to be handled is 8 bits, there is a resolution of 1/256 in terms of luminance. Therefore, even when a general camera is used, a shift of one pixel can be sufficiently recognized.

  Further, when it is necessary to widen the overlapping area 33 ′ due to system restrictions or the like, a camera 13 having a bit depth of 10 bits, 12 bits, or the like may be selected.

  In the above description, it is assumed that the dynamic range of the camera 13 is appropriately controlled by an automatic exposure function that is generally provided in many cameras.

Next, the vertical position adjustment in step S103 in the flowchart of FIG. 7 will be described. In the configuration of the above-described FIG. 2 (c), the region 330 where the gradation area 310 and 320 brightness in the vertical direction is inclined is superimposed, one end of the slope of luminance matches to the upper end of the adjustment projected image 30 _1, the luminance The other end of the slope is in contact with the upper end of the region 331 where the gradation regions 311 and 321 overlap. For this reason, the luminance change when the pixel is scanned in the vertical direction is different from the luminance change when the pixel is scanned in the horizontal direction in the region 331 described above. For example, in the vertical scan in the case of FIG. 2C, the pixel information of the reference region 312 or 322 cannot be obtained, and the reference luminance L ₁ cannot be obtained.

FIG. 12 shows an example of a luminance change when a region 330 in which gradation regions 310 and 320 whose luminance is inclined in the vertical direction is overlapped is scanned in the vertical direction. Here, the horizontal alignment is completed by the above-described processing, and the horizontal center of the overlapping region 33 ′ is scanned in the vertical direction. Therefore, in the region 33 ₁ , the luminances of the adjustment projection images 30 ₁ and 30 ₂ are each ½ of the reference luminance L ₁ .

Referring to FIG. 2, an example of a luminance change in the overlapping region 33 ′ when the regions 33 ₁ and 33 ₂ are aligned in the vertical direction and overlapped in the correct positional relationship is shown in FIG. As shown. In this case, luminance in adjusting the projection image 30 _2, as shown as line 351 in the figure, a half of the luminance L ₁ is in the gradation area 321, the luminance L ₁ at entering the gradation area 320 Thereafter, the luminance decreases at a predetermined inclination toward the end of the gradation region 320. The luminance in adjusting the projection image 30 _1, as shown as line 352 in the figure, is in the gradation region 311 is 1/2 of the luminance L _1, the luminance becomes 0 at entering the gradation area 310 Thereafter, the luminance increases at a predetermined inclination toward the end of the gradation area 310, and becomes the luminance L ₁ at the end position.

FIG. 12B shows an example of the luminance change in the overlapping region 33 ′ when the region 33 ₁ and the region 33 ₂ are overlapped with respect to the correct positional relationship. In this case, for example, the portion of the luminance L _1/2 in the gradation area 311 of the adjustment projection image 30 ₁ indicated by the line 352 enters the gradation area 320 of the adjustment projection image 30 ₂ . Therefore, as illustrated in the line 353B, a luminance protruding portion where the luminance exceeds the luminance L ₁ occurs. Even in this case, after the scan position is shifted from the gradation area 311 in adjusting the projected image 30 ₁ to gradation area 310, similarly to the case of FIG. 11 (b), the difference luminance [Delta] L (<0) is obtained It is done.

FIG. 12C shows an example of a luminance change in the overlapping region 33 ′ when the region 33 ₁ and the region 33 ₂ are overlapped close to the correct positional relationship. In this case, for example, indicated by line 352, the portion where the luminance of the adjustment projected image 30 ₁ of the gradation area 310 begins to increase from zero, enters the adjustment projected image 30 ₂ of the gradation region 321. Therefore, as illustrated in the line 353C, a luminance depression portion where the luminance decreases to the luminance L _1/2 occurs. Even in this case, after the scan position is shifted from the gradation area 321 in adjusting the projection image 30 ₂ to gradation region 320, similarly to the case of FIG. 11 (c), the difference luminance [Delta] L (> 0) is obtained It is done.

As described above, when the adjustment projection images 30 ₁ and 30 ₂ are aligned in the horizontal direction, the adjustment is performed by contacting the gradation area in which the luminance is inclined in the horizontal direction and the gradation area in which the luminance is inclined in the vertical direction. When forming the projection images 30 ₁ and 30 ₂ for use, depending on the direction of the luminance scan, a luminance protruding portion or a luminance depressed portion is detected. For this reason, the analysis unit 120 or the control unit 121 detects a luminance protruding portion or luminance depressed portion by threshold determination, edge determination, or the like for the luminance obtained by scanning, and detects the detected luminance protruding portion or luminance depressed portion. Considering this, it is preferable to perform a process of calculating the deviation amount ΔD.

In this example, the reference luminance L ₁ cannot be acquired by the vertical luminance scan. Therefore, the control unit 121 calculates the amount ΔD according to the above equation (2) using, for example, the luminance L ₁ stored at the time of scanning in the horizontal direction in step S101 of the flowchart of FIG. The process by the control unit 121 at this time is the same as the process described using step S10.

Furthermore, in this example, for example, in adjusting the projection image 30 _1, the gradation area 311 is luminance in the horizontal direction inclined, the luminance in the vertical direction is configured so that the gradation region 310 inclined in contact, which is It is not limited to this example. That is, by providing the portion of the luminance L ₁ between the gradation region 311 and the gradation region 310, the above-described luminance protruding portion or luminance depressed portion does not occur, and the position adjustment is performed in the same manner as the horizontal position adjustment. Can be executed.

Furthermore, in the above description, for example, in adjusting the projection image 30 _1, the gradation area 310 and 311, are provided for the entire right end of the adjustment projected image 30 _1, it is not limited to this example. That is, the gradation region 310 and 311 may be provided in a part of the right end portion of the adjustment projected image 30 _1, may be provided like an island with no overlapping region 33 'in the contact with the right end. Of course, even in these cases, the gradation area 320 and 321 in the adjustment projection image 30 _2, a and the adjustment projection image 30 ₁ and adjusting the projected image 30 ₂ when stacked have the overlapping region 33 ' , position and gradation areas 310 and 311 in the adjustment projected image 30 ₁ is provided so as to correspond.

  In the conventional method of capturing a projected image, recognizing the position of the projected image on a pixel basis based on the captured image, and performing alignment, one projected image is, for example, 1920 pixels × 1080 pixels (approximately 2 million pixels). In the case of having the resolution, it was necessary to use a camera having a pixel resolution of about 64 million pixels, which is 32 times.

  That is, in order to correctly sample a projection image having a resolution of about 2 million pixels and capture it with a camera, double the resolution is required both in the horizontal and vertical directions according to the sampling theorem. Therefore, at this point, a camera having a resolution of 2 million pixels × 2 × 2 = 8 million pixels is required. Furthermore, since the projection position is adjusted while moving the projection image, a margin is required for the imaging range of the camera. If the imaging range of the camera is set to √2 times in the horizontal and vertical directions with respect to the range of the projected image, the resolution is 8 million pixels × √2 × √2 = 16,000,000 pixels.

  Furthermore, since the two projected images are projected side by side, the two projected images are captured at the same time, and thus a double resolution is required in the horizontal direction. Here, since the aspect ratio of the camera is generally fixed, when the horizontal resolution is doubled, the vertical resolution is also doubled. Therefore, the conclusion is reached that a resolution of about 16 million pixels × 2 × 2 = 64 million pixels is necessary. This is 10,667 pixels × 6000 pixels, which is not realistic.

On the other hand, according to the first embodiment, position adjustment is performed based on the luminance of the overlapping region 33 ′ where the adjustment projection images 30 ₁ and 30 ₂ overlap. For this reason, according to the first embodiment, for example, the luminance of the pixel area corresponding to the width of the gradient of the luminance in the gradation areas 310 and 311 (for D pixels) can be viewed. On the other hand, the resolution of the camera may be 1 / D. Therefore, the resolution of the camera only needs to be 32 / D times or more of the resolution of one projection image, and the resolution required for the camera is greatly reduced compared to the conventional technology.

In the above description, the lens shift section 105 ₁ has been described as included in the configuration of the projector apparatus 10 _1, which is not limited to this example. For example, the lens shift section 105 ₁ as an option of the projector apparatus 10 _1, may be used by attaching to the projection optical system 104 _1. Further, when two projector apparatuses 10 ₁ and 10 ₂ are used, it is only necessary to adjust the injection position for one of them. In this case, the lens shift unit can be omitted in the projector apparatus on the side where the injection adjustment is not performed.

(First modification of the first embodiment)
Next, a first modification of the first embodiment will be described. In the first embodiment described above, only one set of two gradation regions whose luminance inclination directions are orthogonal to each other is provided for one adjustment projection image. However, this is limited to this example. Not. The first modified example is an example in which two or more sets of two gradation regions whose luminance inclination directions are orthogonal to each other are provided for one adjustment projection image. In the following, “a set of two gradation areas whose luminance gradient directions are orthogonal to each other” is referred to as “a set of orthogonal gradation areas”.

FIG. 13 shows an example of an adjustment projection image according to the first modification of the first embodiment. In FIG. 13, each of the adjustment projection images 30 ₁₀ , 30 ₁₁ , 30 ₁₂ and 30 ₁₃ has a set of orthogonal gradations on two sides sharing a vertex. In this way, by providing the set of two orthogonal gradations in the adjustment projection image, the ejection position adjustment method according to the first embodiment described above is applied when four projection images are projected onto a common screen. Can do.

More specifically, the adjustment projected image 30 ₁₀ 4 projected in a lattice pattern, 30 _11, 30 ₁₂ and 30 ₁₃ of the adjustment projection image 30 ₁₀ projected on the upper left, the right end, gradation region A set of orthogonal gradations including 3000 and 3001 is arranged, and an orthogonal gradation set including gradation regions 3002 and 3003 is arranged at the lower end.

Also, adjusting the projected image 30 ₁₁ projected on the upper right, the left end, a set of orthogonal gradient direction of the slope of luminance relative to gradation region 3000 and 3001 includes a gradation area 3010 and 3011, which are opposite each distribution At the lower end, a set of orthogonal gradations including gradation areas 3012 and 3013 is arranged.

Moreover, the adjustment projection image 30 ₁₃ projected on the lower right, the upper end, a set of orthogonal gradient direction of the slope of luminance relative to gradation region 3012 and 3013 includes a gradation area 3032 and 3033, which are opposite each A set of orthogonal gradations including gradation areas 3030 and 3031 is arranged at the left end.

Furthermore, adjusting the projected image 30 ₁₂ projected to lower left, the upper end, a set of orthogonal gradient direction of the slope of luminance relative to gradation region 3002 and 3003 includes a gradation area 3022 and 3023, which are opposite each Arranged at the right end is a set of orthogonal gradations including gradation regions 3020 and 3021 in which the direction of the inclination of luminance is reversed with respect to the gradation regions 3030 and 3031, respectively.

The four adjustment projection images 30 ₁₀ , 30 ₁₁ , 30 _12, and 30 ₁₃ are projected onto the screen 14 such that the sets of orthogonal gradations arranged on opposite sides overlap to form overlapping regions. Then, for example, based on the projection position of the adjusting projection image 30 _10, and the adjustment projection image 30 ₁₁ adjacent to the adjustment projected image 30 _10, for the adjustment projection image 30 ₁₂ performs injection position adjustment. After the adjustment of the emission positions of the adjustment projection images 30 ₁₁ and 30 ₁₂ is completed, the adjustment of the emission position of the adjustment projection image 30 ₁₃ is performed using one of the adjustment projection images 30 ₁₁ and 30 ₁₂ as a reference.

After the adjustment of the injection positions of the adjustment projection images 30 ₁₀ , 30 ₁₁ , 30 ₁₂ and 30 ₁₃ is completed, the adjustment projection image other than the adjustment projection image 30 ₁₀ used as a reference is used as a reference again as necessary. The injection position adjustment may be executed.

(Second modification of the first embodiment)
Next, a second modification of the first embodiment will be described. In the second modified example, two patterns of adjustment projection images are prepared in which orthogonal gradation groups are arranged on each side and the gradation areas are arranged differently. The gradation regions arranged in the two patterns of adjustment projection images are configured such that the directions of the luminance gradients in the gradation regions corresponding to positions between the adjustment projection images are orthogonal to each other. In the second modification, the projection image for adjustment according to the embodiment can be applied without projecting the upper limit of the number of projection images by projecting the two patterns of adjustment projection images so that the adjustment projection images of different patterns are adjacent to each other. .

  FIG. 14 shows an example of an adjustment projection image according to the second modification of the first embodiment. FIG. 14A and FIG. 14B show examples of the first pattern (pattern A) and the second pattern (pattern B), respectively, of the two patterns of adjustment projection images.

In the projection image 30 ₂₀ for adjustment of the pattern A illustrated in FIG. 14A, a set of orthogonal gradations including gradation areas 3041 and 3042 is arranged at the right end, and an orthogonal gradation including gradation areas 3043 and 3044 at the lower end. Are arranged. Adjusting the projected image 30 ₂₀ may further, at the left end, a set of orthogonal gradient that includes gradation area 3045 and 3046 are disposed at the upper end, a set of orthogonal gradient that includes gradation area 3047 and 3048 are arranged.

Adjusting the projected image 30 ₂₁ of pattern B illustrated in FIG. 14 (b), the left end, the orthogonal containing gradation area 3041 and gradation area 3056 and 3055 which direction is opposite each of the slope of luminance relative to 3042 A set of gradations is arranged. In addition, a set of orthogonal gradations including gradation areas 3057 and 3058 in which the direction of inclination of luminance is reversed with respect to the gradation areas 3044 and 3043 is arranged at the upper end. Further, at the right end, a set of orthogonal gradations including gradation areas 3051 and 3052 in which the luminance inclination directions are reversed with respect to the gradation areas 3046 and 3045, respectively. Furthermore, at the lower end, a set of orthogonal gradations including gradation areas 3054 and 3053 whose luminance inclination directions are reversed with respect to the gradation areas 3047 and 3048, respectively, is arranged.

FIG. 14 (a) and 14 in combination, such as (b) By distributing each gradation region 3041-3048 each gradation area from 3051 to 3058, respectively, the projected image 30 for adjustment example and adjustment projected image 30 _{20 No} matter which direction is projected side by side, the injection position adjustment method according to the first embodiment can be applied.

And the adjustment projection image 30 ₂₀ of these patterns A, the adjustment projected image 30 ₂₁ of a pattern B, as illustrated in FIG. 14 (c), the same pattern is projected side by side so as not adjacent. In the example of FIG. 14 (c), the and the adjustment projection image 30 ₂₀ of a pattern A, the adjustment projected image 30 ₂₁ of a pattern B, by projecting each alternately in the horizontal and vertical directions, the same pattern is adjacent The arrangement which does not do is realized.

In the case of the arrangement shown in FIG. 14C, for example, the center point C ₀ of the entire projection image based on all the adjustment projection images is obtained, and the center point C _n (n = 1, 2, etc.) of each other adjustment projection image. 3...) And the center point C ₀ may be projected in the order of decreasing distance, and the injection position may be adjusted sequentially.

In the example of FIG. 14 (c), the central adjustment for the projection image is projected that includes a center point C _0, adjusting the projected images of two vertically adjacent to the corresponding adjustment projected image are sequentially projected, the projected forward The injection position is adjusted with reference to the central adjustment projection image. Next, two adjustment projection images adjacent to the left and right of the central adjustment projection image are sequentially projected, and the emission position is adjusted in the projected order with reference to the central adjustment projection image. Further, four adjustment projection images that are in contact with the central adjustment projection image are sequentially projected, and each adjustment adjacent to the upper, lower, left, and right of the central adjustment projection image in which the emission position has already been adjusted in the order of projection. The injection position is adjusted with reference to the projection image for use.

  According to this method, it is possible to adjust the emission position of each projector apparatus without shifting the center of the entire projection image by a plurality of projection images. This method is particularly suitable for the case where it is desired to project the entire projected image on the center of the screen.

Further, for example, in the case of the arrangement shown in FIG. 14C, one of the four corners of the entire projection image of all the adjustment projection images is defined as the reference point P, and the center point C _m (m = 0, 1, 2, 3...) And the reference point P in order of increasing distance, it is conceivable to project the adjustment projection images in order, and sequentially adjust the injection position.

  In the example of FIG. 14C, the upper left corner is the reference point P, the first adjustment projection image including the reference point P, and the first adjustment projection having the shortest distance from the center point to the reference point P. The second adjustment projection image immediately below the image is projected, and the emission position of the second adjustment projection image is adjusted using the first adjustment projection image as a reference. Next, a third adjustment projection image adjacent to the right of the first adjustment projection image, the distance from the center point to the reference point P being the second closest, is projected, and the first adjustment projection image is used as a reference. As described above, the emission position of the third adjustment projection image is adjusted. Next, the emission position of the fourth adjustment projection image in which the vertex facing the reference point P is in contact with the first adjustment projection image, the distance from the center point to the reference point P being the third closest, The injection position has already been adjusted, and adjustment is performed with reference to the second or third adjustment projection image adjacent to the fourth adjustment projection image. Thereafter, in accordance with the distance from the center point to the reference point P, the adjustment projection images are sequentially projected in ascending order of the distance, and the injection position is adjusted based on the adjacent adjustment projection image whose emission position has already been adjusted. Is done.

  According to this method, it is possible to adjust the emission position of each projector apparatus without shifting the reference point. This method is particularly suitable for the case where projection is performed by determining the position of the end of the entire projection image by a plurality of projection images.

  In addition, the adjustment order of the projection position of each projection image in the case where a large number of projection images are simultaneously projected by a large number of projector apparatuses is not limited to the above example.

(Second Embodiment)
Next, a second embodiment will be described. In the first embodiment described above, adjustment of the projection light emission position by the projector devices 10 ₁ and 10 ₂ is performed by adjusting the lens shift amount of the lens shift units 105 ₁ and 105 ₂ . On the other hand, in the second embodiment, the emission position of the projection light is adjusted by moving the pedestal of each projector apparatus.

  FIG. 15 shows an exemplary configuration of the multi-projector system 1 according to the second embodiment. In FIG. 15, the same reference numerals are given to the portions common to FIG. 5 described above, and detailed description thereof is omitted.

The configuration shown in FIG. 15 is different from the configuration shown in FIG. 5 described above in that the projector devices 10 ₁ ′ and 10 ₂ ′ have base driving units 106 ₁ and 106 ₂ instead of the lens shift units 105 ₁ and 105 _2. It has a different point. Control signals output from the control unit 121 ′ are supplied to the pedestal drive units 106 ₁ and 106 ₂ , respectively.

Since the projector apparatuses 10 ₁ ′ and 10 ₂ ′ can be realized with a common configuration, the projector apparatus 10 ₁ ′ will be described below as an example. The projector apparatus 10 ₁ ′ is installed on a pedestal that can move the projector apparatus 10 ₁ ′ in the horizontal and vertical directions by a mechanical mechanism. The pedestal driving unit 106 ₁ controls the mechanical mechanism of the pedestal according to the control signal supplied from the control unit 121 ′, and moves the projector device 10 ₁ ′ in the horizontal direction and the vertical direction. Thereby, the emission position of the projection light by the projector apparatus 10 ₁ ′ can be adjusted. The adjustment process of the emission position of the projection light according to the second embodiment can apply the process of the first embodiment described above as it is.

In the above description, the configuration in which the base driving unit 106 ₁ is included in the projector device 10 ₁ ′ has been described, but this is not limited to this example. For example, a pedestal may be an option of the projector apparatus 10 ₁ ′, and the pedestal driving unit 106 ₁ may be included in the configuration of the pedestal. Further, when two projector apparatuses 10 ₁ ′ and 10 ₂ ′ are used, it is only necessary to adjust the injection position for one of them. In that case, the pedestal drive unit can be omitted in the projector apparatus on the side where the injection adjustment is not performed. .

(Third embodiment)
Next, a third embodiment will be described. In the first embodiment and the second embodiment described above, the alignment by the adjustment projection images 30 ₁ and 30 ₂ is performed by adjusting the emission position of the projection light in the projector devices 10 ₁ and 10 ₂ . . On the other hand, in the third embodiment, in one of the projector devices 10 ₁ and 10 ₂ , for example, the projector device 10 ₂ , the projection light emission position is fixed, and the adjustment projection image on the image display device 101 ₂ is used. The position of 30 ₂ is shifted to align the adjustment projection images 30 ₁ and 30 ₂ .

Not limited to this, in the third embodiment, the positions of the adjustment projection images 30 ₁ and 30 ₂ on the image display devices 101 ₁ and 101 ₂ may be shifted in the projector apparatuses 10 ₁ and 10 _2, respectively. Good.

FIG. 16 shows an exemplary configuration of the multi-projector system 1 according to the third embodiment. In FIG. 16, the same reference numerals are given to the portions common to FIG. 5 described above, and detailed description thereof is omitted. The configuration shown in FIG. 16 is different from the configuration shown in FIGS. 5 and 15 described above in that each projector apparatus 10 ₁ and 10 _{2 includes} lens shift units 105 ₁ and 105 ₂ and pedestal drive units 106 ₁ and 106 _2. There is no means for mechanically changing the emission position of the projection light.

16, in for example the projector 10 _2, the image processing unit 100 ₂ ', for example, once written into the frame memory 107 ₂ input image data. The image processing unit 100 ₂ ', the frame performs predetermined image processing on the image data written into the memory 107 _2, finally obtained writes projection image data again in the frame memory 107 _2. The image processing unit 100 ₂ ′ reads out the projection image data from the frame memory 107 ₂ and transfers it to the image display device 101 ₂ .

At this time, the image processing unit 100 ₂ ′ changes the timing for reading the projection image data from the frame memory 107 _{2 in} accordance with the control signal supplied from the control unit 121 ″ of the adjustment device 12. Image data in the image display device 101 ₂ when the update timing is constant, this makes it possible to shift the position of the projection image data of the image display device 101 on _2.

The image processing unit 100 ₁ in the projector apparatus 10 ₁ 'control and the frame memory 107 _1, the image processing unit 100 ₂ of the projector 10 _2' is the same as the control and the frame memory 107 _2. Therefore, the following description the image processing unit 100 ₂ 'and the frame memory 107 ₂ of the projector apparatus 10 ₂ as an example.

Figure 17 describes a method of aligning a third embodiment the projector apparatus 10 ₁ and 10 ₂ of the projected image by. 17 (a) to 17 (d), the same reference numerals are given to the portions common to FIG. 2 described above, and detailed description thereof is omitted. Further, in FIGS. 17A to 17D, for the sake of explanation, an arrow-like image is displayed in the portion related to the overlapping region 33 ′. In practice, however, FIGS. As shown in (c), a set of gradation images each having a predetermined luminance gradient is arranged in the overlapping portion 33 ′.

FIG. 17A shows an example in which the adjustment projection images 30 ₁ and 30 ₂ are projected with the correct positional relationship, and the projection positions of the adjustment projection images 30 ₁ and 30 ₂ have no vertical and horizontal deviations. . In this case, it can be seen that the upper and lower sides of the overall projection image 300 are straight lines, and the overall projection image 300 is rectangular. In addition, an overlapping region 33 ′ having uniform luminance is formed in the overlapping portion of the adjustment projection images 30 ₁ and 30 ₂ .

Figure 17 (b) shows an example of a state in which the projection position of the adjustment projected image 30 ₁ and 30 ₂ are displaced in the vertical direction. In this case, the downward movement of the projection position of the adjustment projected image 30 _1, by performing at least one of the upward movement of the projection position of the adjustment projected image 30 _2, adjusting the projected image 30 ₁ and 30 ₂ projection positions are aligned. Here, the alignment is performed by moving the projection content of the adjustment projection image 30 ₂ upward with the adjustment projection image 30 ₂ as a reference.

That is, the projection images 30 ₁ and 30 ₂ for adjustment are projected onto the screen by the projector devices 10 ₁ and 10 _2, and the projection image is captured by the camera 13. The captured image is supplied to the adjustment device 12 and input to the analysis unit 120. The analysis unit 120 obtains the luminance at each location as described above, and inputs information indicating the luminance to the control unit 121 ″. The control unit 121 ″ uses the deviation ΔD based on each luminance supplied from the analysis unit 120. And a control signal for each of the projector apparatuses 10 ₁ and 10 ₂ for correcting the deviation amount ΔD is generated.

In the third embodiment, as shown in FIG. 17 (c), the control unit 121 ", the projection position of the adjusting projection image 30 ₂ without changing shifts the image projected on a pixel-by-pixel basis. In other words if the control unit 121 ", the injection position of the projection image by the projector 10 ₂ without changing the contents of the projection image to be emitted, is shifted in units of pixels.

In this example, the control unit 121 ", when transferring to the image display device 101 ₂ reads the projected image data from the frame memory 107 _2, depending on the shift amount ΔD the timing of reading the projected image data from the frame memory 107 ₂ A control signal to be controlled is generated and supplied to the image processing unit 100 ₂ ′. The image processing unit 100 ₂ ′ determines the timing for reading the projection image data from the frame memory 107 _{2 in} accordance with this control signal in the image display device 101 ₂ . The content of the projection image based on the projection image data is shifted in the direction indicated by the arrow A in FIG.

As an example, when the above-described control based on the alignment is not performed, the update of the image data in the image display device 101 ₂ and the reading of the projection image data from the frame memory 107 ₂ are performed in synchronization with a predetermined vertical synchronization signal. Shall be. The reading of the projection image data from the frame memory 107 ₂ from the top line of the image shall be performed toward the lower end of the line. For example, as shown in FIG. 17 (c), when shifting upward the contents of the projection image by the projection image data, the control unit 121 of the adjusting device 12 ", the timing of reading from the frame memory 107 _2, image display the device 101 _{and second} read timing, and outputs a control signal to delay by an amount corresponding to the shift amount [Delta] D.

FIG. 17D shows an example of the entire projection image 300 ′ after the shift. According to this method, because only the contents of the projection image is shifted, the projection position by the injected projection light from the projector 10 ₂ is the same as the previous image registration. That is, the projection position of each projection image by the projector devices 10 ₁ and 10 ₂ is the same as that before the image alignment shown in FIG. 17B, and the entire projection image 300 ′ immediately after the vertical alignment is performed. The range will not be rectangular. In this case, by replacing the part and a region 34 ₁ and 34 ₂ of the image pop-out against a rectangle like a black image can be the entire projected image 300 'and the rectangular.

For example, the image processing unit 100 ₂ ′ determines the number of lines corresponding to the deviation line ΔD, that is, the difference line obtained by shifting the read timing from the frame memory 107 _{2 with} respect to the read timing of the image display device 101 ₂ according to the control signal. Are converted to black image lines. The control unit 121 of the adjusting device 12 ", the projector apparatus 10 'with respect to,. The image processing unit 100 ₁ supplies a control signal corresponding to the displacement amount [Delta] D' ₁ of the image processing unit 100 _1, the control According to the signal, the number of lines corresponding to the shift amount ΔD is converted into a black image line.

Here, consider a case where the shift amount ΔD of the other adjustment projection image is calculated with one adjustment projection image as a reference. In this case, when the shift amount ΔD is a positive value (in the state shown in FIG. 12B), the image processing unit 100 ₂ ′ follows the control signal from the control unit 121 ″ and the lower end of one adjustment projection image and the other A black image line having the number of lines corresponding to the shift amount ΔD is arranged at the upper end of the adjustment projection image of FIG .. Also, when the shift amount ΔD is a negative value (the states of FIG. 12C and FIG. 17). In accordance with the control signal from the control unit 121 ″, the image processing unit 100 ₂ ′ has the number of lines corresponding to the shift amount ΔD at the upper end of one adjustment projection image and the lower end of the other adjustment projection image, respectively. Arrange black image lines.

  Although the vertical alignment has been described above, the third embodiment can apply the same method to the horizontal alignment. The alignment in the horizontal direction can be realized by shifting the position of the projection image data on the image display device for each line in the horizontal direction according to the shift amount ΔD.

In this horizontal alignment, the shift amount ΔD is a negative value (see FIG. 11C). For example, the adjustment projection image 30 ₂ is moved away from the adjustment projection image 30 ₁ as a reference. when the, thus giving the opposite end, an image of range corresponding to the shift amount ΔD of facing to the end remains in the overlap region 33 'outside each other, an effect on adjusting the projected image 30 ₁ to the direction of movement . In this case, in the image in the range, each line includes a rear end portion corresponding to the shift amount ΔD of the previous line. Further, (see FIG. 11 (b)) and shift amount ΔD is a positive value, when moving in a direction to bring the adjustment projected image 30 _2, the end of the moving direction of the moving tuned for a projection image was In a range corresponding to the shift amount ΔD, each line includes a tip portion corresponding to the shift amount ΔD of the next line.

Accordingly, in the case of horizontal alignment, when the shift amount ΔD is a negative value, the image processing unit 100 ₂ ′ moves the adjusted projection image moved according to the control signal from the control unit 121 ″. The pixels of the black image are arranged in a range corresponding to the shift amount ΔD at the end opposite to the direction, and when the shift amount ΔD is a positive value, the image processing unit 100 ₂ ′ In accordance with the control signal from 121 ″, the pixels of the black image are arranged in a range corresponding to the shift amount ΔD at the end in the moving direction of the moved adjustment projection image.

  As described above, according to the third embodiment, alignment of a plurality of projection images can be executed without performing optical or mechanical control.

(Fourth embodiment)
Next, a fourth embodiment will be described. In the first to third embodiments described above, the projector devices 10 ₁ and 10 ₂ (in the case of the first embodiment) are installed horizontally, and the projection images 20 ₁ and 20 by the projector devices 10 ₁ and 10 ₂ are installed. It was assumed that ₂ was projected in parallel.

However, in actuality, one of the projected images 20 ₁ and 20 ₂ may be projected at an angle θ with respect to the other. In the first to third embodiments described above, move the positioning processing of the projection image 20 ₁ and 20 _2, the projected image 20 ₁ and 20 ₂ (adjustment projection image 30 ₁ and 30 ₂₎ in the horizontal and vertical directions It is done by letting. For this reason, the alignment processing according to the first to third embodiments cannot cope with a shift caused by the rotation of the projection images 20 ₁ and 20 ₂ .

  Therefore, in the fourth embodiment, for example, gradation regions whose luminance gradients are opposite to each other are provided for each adjustment projection image projected from two projector apparatuses. Then, in the overlapping area where each gradation area is overlapped between the adjustment projection images, a change in luminance is detected in a direction orthogonal to the inclination of the luminance, and a deviation in the rotation direction of the projection image by each projector device is detected using the detection result. Is determined, the angle of the projection image is adjusted based on the determination result, and alignment in the rotation direction is performed.

  After performing the alignment process in the rotation direction according to the fourth embodiment, the alignment process in the horizontal and vertical directions according to the first to third embodiments described above is performed. Thereby, even if it is a case where a projection image is rotated by a certain angle (theta), the position alignment of the projection image between several projector apparatuses can be performed with high precision.

FIG. 18 schematically shows a multi-projector system according to the fourth embodiment. In FIG. 18, parts common to those in FIG. 1 described above are denoted by the same reference numerals, and detailed description thereof is omitted. A multi-projector system 1 ′ shown in FIG. 18 has a plurality of projector apparatuses 1000 ₁ and 1000 ₂ , an image output apparatus 11, an adjustment apparatus 1200, a camera 13, and the like. including.

Image output device 11 outputs image data to projector devices 1000 ₁ and 1000 _2, respectively. Each of the projector devices 1000 ₁ and 1000 ₂ receives the image data output from the image output device 11 as input image data, performs predetermined image processing on the input image data, and generates projection image data. The light from the light source is modulated based on the projection image data by the light modulator and projected onto the screen 14 as projection images 20 ₁ and 20 ₂ . The two projector apparatuses 1000 ₁ and 1000 ₂ project the projected images 20 ₁ and 20 ₂ onto the common screen 14 so that the overlapping area 21 is generated.

The method for adjusting the angle of the projection image according to the fourth embodiment will be schematically described with reference to FIG. FIG. 19A and FIG. 19B show examples of projection images according to the fourth embodiment, based on image data output from the image output device 11. Figure 19 (a) shows an example of the adjustment projected image 30 ₃₀ by the image data for angle adjustment output for the projector apparatus 1000 ₁ disposed on the left side. Figure 19 (b) shows an example of the adjustment projected image 30 ₃₁ by the image data for angle adjustment output for the projector apparatus 1000 ₂ disposed on the right side.

These adjustment projection images 30 ₃₀ and 30 ₃₁ are projected onto the screen 14 with the right end portion and the left end portion overlapped as illustrated in FIG. 19C. In FIG. 19 (c), the adjustment for the projection image 30 ₃₀ and 30 ₃₁ and are stacked portion, shown as overlapping regions 33 _30, a projection image for adjustment from the left end of the adjustment projection image 30 ₃₀ projected on the screen 14 A projection image including the right end of 30 ₃₁ is shown as an overall projection image 300. Further, in FIGS. 19A to 19C, the vertical direction is shown as a coordinate y, and the horizontal direction is shown as a coordinate x. In this case, the coordinates (x, y) are based on one adjustment projection image (referred to as adjustment projection image 30 ₃₀ ) when the adjustment projection images 30 ₃₀ and 30 ₃₁ are projected on the screen 14, for example. Indicates the coordinates.

Adjusting the projected image 30 ₃₀ illustrated in FIG. 19 (a), an adjustment region 3060 corresponding to the overlapping area 33 _30, and a rest area 3061. The adjustment area 3060 is a gradation image in which the luminance decreases with a certain inclination in one direction. In the example of FIG. 19A, the gradation image of the adjustment area 3060 has a luminance decreasing from the left end toward the right end as indicated by an arrow in the drawing.

Adjusting the projected image 30 ₃₁ illustrated in FIG. 19 (b), the adjustment region 3070 corresponding to the overlapping area 33 _30, and a rest area 3071. The adjustment area 3070 is a gradation image having a luminance gradient in the opposite direction to the adjustment area 3060 described above. That is, the brightness of the gradation image in the adjustment area 3070 decreases from the right end to the left end as indicated by the arrows in the drawing.

  In the fourth embodiment, the maximum luminance and the minimum luminance due to gradation in the adjustment regions 3060 and 3070 can be set to, for example, the maximum luminance and the minimum luminance in the image data, respectively. The gradation in the adjustment areas 3060 and 3070 applicable to the fourth embodiment is not limited to this, and it is only necessary that the maximum brightness and the minimum brightness in the adjustment areas 3060 and 3070 match each other. In the fourth embodiment, the brightness of the areas 3061 and 3071 can be set arbitrarily.

Incidentally, in the adjustment region 3060 and 3070, the direction in which the luminance is inclined, it is preferably parallel to each adjustment projected image 30 ₃₀ and 30 ₃₁ of the sides. Further, in the example shown in FIG. 19 (a) and FIG. 19 (b), the but the direction in which the luminance is tilted is set to the horizontal direction of the adjustment projected image 30 ₃₀ and 30 _31, respectively, which is not limited to this example, luminance The direction in which is inclined may be a vertical direction or may be oblique.

Projector apparatuses 1000 ₁ and 1000 ₂ project adjustment projection images 30 ₃₀ and 30 ₃₁ configured in this way onto screen 14 with regions 3060 and 3070 overlapped. Then, the inclination and the image of the image and the region 3070 in the region 3060 by reverse gradation image are combined, the overlapping area 33 ₃₀ of the image shown in FIG. 19 (c) to each other. That is, overlapping area 33 ₃₀ would have gradation image inclined in opposite directions brightness from each other are combined.

At this time, the adjustment projected image 30 ₃₀ and 30 _31, in the adjustment region 3060 and 3070, when the direction of the slope of luminance is projected in parallel, the brightness of the overlapping area 33 the ₃₀ becomes uniform. On the other hand, if one of the adjustment region 3060 and 3070 are rotated at an angle with respect to the other theta, intensity of the overlap region 33 ₃₀ is substantially perpendicular to the direction of the slope of the brightness in the adjustment region 3060 and 3070 Tilt in the direction you want.

Therefore, in the fourth embodiment, the adjustment device 1200, the entire projection image 300 projected on the screen 14 by the camera 13 and imaging, the luminance change in the overlap region 33 ₃₀ analyzes the entire projected image 300 that is captured get. Then, the adjustment device 1200 determines whether one of the adjustment projection images 30 ₃₀ and 30 ₃₁ is rotating with respect to the other based on the acquired luminance change, and when determining that it is rotating. Then, a control signal for adjusting the angle of the projected image is generated.

More specifically, the adjustment device 1200, as indicated by arrow 400 in FIG. 19 (c), whereas among the adjustment projected image 30 ₃₀ and 30 ₃₁ (a adjustment projected image 30 ₃₀₎ as a reference the adjustment region 3060 of the adjustment projection image 30 ₃₀ as a reference, by scanning in a direction perpendicular to the direction of inclination of the luminance in the adjustment region 3060, to detect changes in brightness. When the detected change in luminance is within a predetermined range, the adjustment device 1200 does not rotate the other adjustment projection image 30 ₃₁ with respect to the reference adjustment projection image 30 ₃₀ . determining a projected image projector apparatus 1000 ₁ projects a projection image projector apparatus 1000 ₂ projects and are parallel.

On the other hand, the adjustment device 1200, when the detected change in brightness exceeds the range described above, the other adjustment projected image 30 ₃₁ relative to the adjustment projection image 30 ₃₀ as a reference is rotating, the projector device 1000 to the projection _{image 1} is projected, it is determined that the projected image projector apparatus 1000 ₂ projects is rotating. In this case, the adjustment device 1200 generates a control signal for adjusting the angle of the projected image, for example, supplied to the projector 1000 ₂ for projecting other adjustment projected image 30 _31.

  In the following, a state in which a projection image projected by one projector device and a projection image projected by the other projector device are parallel is referred to as a correct angular relationship.

With reference to FIG. 20, the method for determining the presence or absence of rotation of the projection image according to the fourth embodiment will be described in more detail. As illustrated in FIG. 20A, the adjustment projection image 30 ₃₁ is counterclockwise at an angle θ about the center 410 of the adjustment projection image 30 ₃₁ with respect to the reference adjustment projection image 30 ₃₀ . Consider the case of rotating around (counterclockwise).

The adjustment device 1200 captures the adjustment projection images 30 ₃₀ and 30 ₃₁ projected on the screen 14 as shown in FIG. 20A, and analyzes the captured image. Adjustment device 1200, the analysis based on the result, and extracts an overlapping area 33 ₃₀ from the entire projected image 300 consisting of adjusting the projected image 30 ₃₀ and 30 _31, in the overlapping area 33 _30, and the direction of inclination of the brightness of the adjustment region 3060 Extract the luminance change in the orthogonal direction. In the example of FIG. 20 (a), adjusting device 1200, as shown by arrow 400, for example, the midpoint of the lower and upper ends of the adjustment region 3060 as a reference of the adjustment region 3060 and 3070 constituting the overlapping area 33 ₃₀ The image is scanned along a line passing through to obtain brightness. Note that the lower end side and upper end side of the adjustment area 3060 are set as the start point and end point of scanning, respectively.

Thus, when acquiring the luminance along a direction perpendicular to the direction of inclination of the luminance in the adjustment region 3060 of the adjustment projection image 30 ₃₀ as a reference, in the adjustment region 3060, it scans the position of the same gradation in the gradation Will do. Therefore, no change in luminance is detected in the adjustment area 3060.

On the other hand, in the adjustment region 3070 of the adjustment projection image 30 ₃₁ rotating at an angle θ with respect to the adjustment projected image 30 _30, as illustrated in the lower diagram of FIG. 20 (b), the scanning The direction (arrow 400) is inclined by an angle θ with respect to the adjustment region 3070. In FIG. 20B, the upper diagram shows a change in the luminance L in the adjustment region 3070 by a line 401. Since the scan direction is inclined with respect to the adjustment area 3070 by an angle θ, the horizontal position in the adjustment area 3070 differs at the start point and end point of the scan. Accordingly, the luminances L _S and L _{E at} the start point and end point of the scan are positions of different gradations in the horizontal gradation of the adjustment region 3070, and the luminance changes from the start point to the end point of the scan.

FIG. 21 shows an example of a luminance change detected when the adjustment area 3070 is rotating. FIG. 21A shows an example in which the luminance L _{S at} the start point of the scan is lower than the luminance L _{E at the} end point, and the gradient of the luminance change with respect to the scan position is positive. In this case, the end point of the scan in the adjustment area 3070 is on the right side of the start point, and the adjustment area 3070 rotates counterclockwise (counterclockwise) with respect to the adjustment area 3060 in accordance with the example of FIG. Indicates that Accordingly, the projector 1000 ₂ that projects the adjusting projection image 30 ₃₁ including the adjustment region 3070, by rotating the projected image clockwise, the projection image by the projector apparatus 1000 ₁ and 1000 ₂ is correct angular relationship.

On the other hand, FIG. 21B shows an example in which the luminance L _{S at} the start point of scanning is higher than the luminance L _{E at the} end point, and the gradient of the luminance change with respect to the scan position is negative. In this case, contrary to the above, the end point of the scan in the adjustment area 3070 is on the left side of the start point, and the adjustment area 3070 is rotated clockwise (clockwise) with respect to the adjustment area 3060. Accordingly, the projector 1000 _2, by rotating the projected image counterclockwise, the projection image by the projector apparatus 1000 ₁ and 1000 ₂ is correct angular relationship.

  Note that the luminance illustrated in FIGS. 21A and 21B is a luminance obtained by combining the luminance acquired in the adjustment region 3060 and the luminance acquired in the adjustment region 3070. In this case, in the adjustment region 3060, since the scan is performed in a direction orthogonal to the direction of the luminance gradient, the luminance is a fixed value. Therefore, the luminance illustrated in FIGS. 21A and 21B is a luminance change in the adjustment region 3070 with the luminance in the adjustment region 3060 as an offset.

  FIG. 22 shows the configuration of an example of the multi-projector system 1 ′ according to the fourth embodiment in more detail. In FIG. 22, the same reference numerals are given to the same parts as those in FIGS. 5 and 18 described above, and detailed description thereof is omitted.

The image output apparatus 11 includes an image output unit 110 that outputs each adjustment image data for projecting the adjustment projection images 30 ₃₀ and 30 ₃₁ described above. Each image data for adjustment is supplied as input image data to the projector apparatuses 1000 ₁ and 1000 ₂ .

The projector apparatus 1000 ₁ includes an image processing unit 100 ₁ , an image display device 101 ₁ , a light source 102 ₁ , an illumination optical system 103 ₁ , a projection optical system 104 _1, and a rotation mechanism unit 1010 ₁ . Similarly, the projector apparatus 1000 ₂ includes an image processing unit 100 ₂ , an image display device 101 ₂ , a light source 102 ₂ , an illumination optical system 103 ₂ , a projection optical system 104 _2, and a rotation mechanism unit 1010 _2. . As described above, the projector apparatuses 1000 ₁ and 1000 ₂ can be realized with a common configuration. Therefore, the projector apparatus 1000 ₁ will be described below as an example.

In the projector apparatus 1000 ₁ , the image processing unit 100 ₁ , the image display device 101 ₁ , the light source 102 ₁ , the illumination optical system 103 _1, and the projection optical system 104 ₁ are substantially the same as the corresponding configurations described with reference to FIG. Therefore, explanation here is omitted.

In the projector device 1000 ₁ , the rotation mechanism unit 1010 ₁ rotates the image display device 101 ₁ on the same plane as the emission surface, for example, with the center of the emission surface as the center of rotation, according to the control signal from the adjustment device 1200. Thereby, the angle of the projection image on the screen 14 can be adjusted.

The light emitted from the image display device 101 ₁ is projected as a projection image onto the screen 14 via the projection optical system 104 ₁ . When the input image data input to the image processing unit 100 ₁ is image data for projecting the adjustment projection image 30 ₃₀ output from the image output device 11, the adjustment projection image 30 is applied to the screen 14. ₃₀ is projected. The screen 14, in a similar manner from the projector 1000 _2, adjusting the projected image 30 ₃₁ is projected. At this time, the adjustment projection images 30 ₃₀ and 30 ₃₁ are projected onto the screen 14 such that an overlapping region 33 ₃₀ is formed.

The adjustment device 1200 includes an analysis unit 1210 and a control unit 1211. Analysis unit 1210, the camera 13 analyzes the captured image data captured to include at least overlapping area 33 ₃₀ example on a screen 14, obtains the luminance change in the overlap region 33 _30. The analysis unit 1210 supplies information indicating the obtained luminance change to the control unit 1211.

The control unit 1211 generates a control signal for adjusting the projection angle of the adjustment projection images 30 ₃₀ and 30 ₃₁ based on the information indicating the luminance change supplied from the analysis unit 1210. Control signal for adjusting a projection angle by the projection apparatus 1000 ₁ is supplied to the rotating mechanism portion 1010 ₁ of the projector apparatus 1000 _1. The control signal for adjusting a projection angle by the projection apparatus 1000 ₂ is supplied to the rotating mechanism 1010 ₂ of the projector 1000 _2.

FIG. 23 is a flowchart illustrating an example of the alignment process according to the fourth embodiment, which is executed by the above-described configuration. 23, in step S200, the adjustment device 1200 adjusts the angle of the projection image by the projector devices 1000 ₁ and 1000 ₂ based on the captured image obtained by capturing the projection image on the screen 14 with the camera 13, as will be described in detail later. Process. In the next step S201, the adjustment device 1200 follows the processing according to the flowchart of FIG. 6 described above, and based on the captured image obtained by capturing the projection image on the screen 14 again with the camera 13, the projection devices 1000 ₁ and 1000 ₂ Perform position adjustment processing.

FIG. 24 is a flowchart illustrating an example of the angle adjustment process in step S200 described above. In step S1000, the two projected projectors PJ # 1 and PJ # 2 (projector apparatuses 1000 ₁ and 1000 ₂ ) use, for example, visual observation so that the adjustment projection images 30 ₃₀ and 30 _{31 each} have an overlapping region 33 _30. It is adjusted and projected onto the screen 14.

In the next step S1001, the camera 13 captures a projection image on the screen 14. In the fourth embodiment, the camera 13, of the entire projected image 300 on at least the screen 14, the overlapping area 33 ₃₀ includes the captured image, and the distortion of the subject image is captured so as not to generate by tilt angle. The captured image is supplied to the adjustment device 1200 and input to the analysis unit 1210.

In the next step S1002, the analyzing unit 1210 extracts an overlapping area 33 ₃₀ from the captured image supplied from the camera 13. Then, the analyzing unit 1210, the overlapping area 33 _30, lower and upper ends of the overlap region 33 ₃₀ was scanned as start and end points, respectively, to obtain the luminance L _S of the starting point, and a brightness L _E endpoints.

In the next step S1003, the analyzing unit 1210 compares the luminance L _E luminance L _S and the end point of the obtained start point in step S1002.

Analysis unit 1210, the result of the comparison in step S1003, when the luminance L _S> luminance L _E (corresponding to FIG. 21 (b)), the process control proceeds to step S1004, the adjustment adjustment projected image 30 ₃₁ It judged to be rotating in the clockwise direction with respect to the projection image 30 _30. Control unit 1211 in accordance with the determination result, and generates a control signal to rotate the projected image counterclockwise, it supplies the rotary mechanism 1010 ₂ of the projector 1000 _2. Then, the process returns to step S1001.

Further, the analysis unit 1210, the result of the comparison in step S1003, when the luminance L _S <brightness L _E (corresponding to FIG. 21 (a)), the process control proceeds to step S1005, the adjustment for the projection image 30 ₃₁ It determines that the relative adjustment projected image 30 ₃₀ are rotated in the counterclockwise direction. Control unit 1211 in accordance with the determination result, and generates a control signal to rotate the projected image clockwise, it supplies the rotary mechanism 1010 ₂ of the projector 1000 _2. Then, the process returns to step S1001.

Further, the analysis unit 1210, the result of the comparison in step S1003, determines that when the luminance L _S = luminance L _E, adjusting the projected image 30 ₃₀ and 30 ₃₁ are in the correct angular relationship terminates the process To do.

Note that the determination of the comparison result in step S1003 is preferably performed with a predetermined margin. For example, when the absolute value of the difference between the luminance L _S and the luminance L _E is within a predetermined range, it is determined that the luminance L _S = the luminance L _E , and the difference between the luminance L _S and the luminance L _E exceeds the predetermined range. In addition, it is determined that the luminance L _S > the luminance L _E or the luminance L _S <the luminance L _E.

Note that, in the position adjustment processing of the projection image in step S201 described above, the image data output from the image output device 11 when the angle adjustment processing of the projection image in step S200 is completed is, for example, FIG. 2 (a) and FIG. It is conceivable to switch to image data for projecting the adjustment projection images 30 ₁ and 30 ₂ shown in (b). After the image output device 11 switches the projection image data, the camera 13 captures the entire projection image 300 on the screen 14 and performs position adjustment processing according to the flowchart of FIG.

However, the adjustment projection images 30 ₁ and 30 ₂ may be projected at the time of step S200. In this case, in the process of step S200, the analysis unit 1210 scans a region 331 in which gradation regions 311 and 321 in which the luminance is inclined in the horizontal direction are overlapped in a direction orthogonal to the luminance inclination direction, and changes the luminance. By acquiring, the same angle adjustment processing is possible. Furthermore, even if the area 330 is similarly scanned to obtain a luminance change, the same angle adjustment processing can be performed.

When angle adjustment is performed using the adjustment projection images 30 ₁ and 30 ₂ , from the lower end to the upper end of the adjustment projection images 30 ₃₀ and 30 ₃₁ exemplified in FIGS. 19A and 19B. Compared to the example in which is used as the adjustment areas 3060 and 3070, the scanning width for detecting the luminance change is narrower. Therefore, there is a possibility that it may be disadvantageous in terms of accuracy as compared with the case where the adjustment projection images 30 ₃₀ and 30 ₃₁ are used.

In the above, as shown in FIG. 20 (a), adjusting the projected image 30 _31, has been described which rotates around a central 410 of the image, in fact, the adjustment projected image 30 ₃₁ In some cases, the image is rotated about an arbitrary point inside or outside the image. Even in this case, the angle adjustment method according to the fourth embodiment can be similarly applied.

In the above description, the angle adjustment of the projected image is performed by rotating the image display device 101 ₂ by the rotary mechanism 1010 ₂ (the projector apparatus 1000 _2), which is not limited to this example. That is, the angle adjustment of the projected image, as in the second embodiment described above may be performed by the base drive unit 106 ₂ for driving the pedestal of the projector 1000 _2, third embodiment described above As described above, the projected image may be rotated by image processing in the image processing unit 100 ₂ ′.

(Fifth embodiment)
Next, a fifth embodiment will be described. In the fifth embodiment, each adjustment projection image area corresponding to an overlapping area in which each adjustment projection image projected by two projector apparatuses overlaps is divided into three areas in the vertical direction. The edge region is a gradation image whose luminance is inclined in the first direction, and the middle region is a gradation image whose luminance is inclined in a direction orthogonal to the first direction.

  A method for adjusting the angle of a projection image according to the fifth embodiment will be schematically described with reference to FIG. In the fifth embodiment, since the multi-projector system 1 ′ according to the fourth embodiment described above can be applied as it is, a detailed description of the system is omitted.

FIG. 25A and FIG. 25B show examples of adjustment projection images according to the fifth embodiment. 25 (a) shows an example of the adjustment projection image 30 ₄₀ projected from the projector 1000 ₁ disposed on the left side. Figure 25 (b) shows an example of the adjustment projection image 30 ₄₁ projected from the projector 1000 ₂ disposed on the right side.

The region 33 ₄₀ the right portion of the adjustment projection image 30 ₄₀ shown in FIG. 25 (a), are overlapped and the region 33 ₄₁ the left part of the adjustment projection image 30 ₄₁ shown in FIG. 25 (b), Projected onto the screen 14. FIG. 25 (c) shows the the adjustment projection image 30 ₄₀ and adjusting the projected image 30 ₄₁ is projected superimposed, overlapping region 33 ₄₂ regions 33 ₄₀ and 33 ₄₁ are overlapped is formed example.

In adjusting the projection image 30 ₄₀ exemplified in FIG. 25 (a), region 33 ₄₀ includes a third region 3080,3081 and 3082. Regions 3080 and 3082 sandwiching the region 3081 are gradation images in which the luminance decreases with a certain inclination toward the right side. In addition, the region 3081 is a gradation image in which the luminance decreases with a certain inclination toward the lower side in a direction orthogonal to the direction of the inclination of the regions 3080 and 3082.

On the other hand, in the adjustment projection image 30 ₄₁ illustrated in FIG. 25 (b), the region 33 _41, is located in the region 3080,3081 and 8082 in the adjustment projection image 30 ₄₀ respectively correspond, 3 areas 3090,3091 and 3092. Each of the areas 3090, 3091, and 3092 is a gradation image whose luminance is inclined in the opposite direction to the areas 3080, 3081, and 8082 corresponding to the positions.

In such a configuration, the adjustment projected image 30 ₄₀ and 30 _41, in the overlap region 33 ₄₂ which is formed by projecting overlapping as regions 33 ₄₀ and 33 ₄₁ are overlapped, regions 3080 and 3090, regions 3081 and Regions corresponding to 3091 and regions 3082 and 3092 are defined as regions # 1, # 2, and # 3 as illustrated in FIG. 25C.

In the fifth embodiment, the adjusting device 1200, an image of the overlap region 33 _42, as indicated by arrow 420 in FIG. 25 (c), each region in the vertical direction # 1, across the # 2 and # 3 Scan and detect the brightness of each region # 1, # 2 and # 3. As the brightness of each of the areas # 1, # 2, and # 3, an average value of the brightness in each of the areas # 1, # 2, and # 3 can be used. The adjusting device 1200 compares the luminances of the regions # 1 and # 3 among the detected luminances of the regions # 1, # 2, and # 3, and determines whether the projection image is rotated based on the comparison result.

Hereinafter, the adjustment projection image 30 ₄₀ as a reference, each area perpendicular to the area 33 ₄₀ # 1 scans # 2 and # 3, rotation of the adjustment projection image 30 ₄₁ with respect to the adjustment projected image 30 ₄₀ The presence or absence of is determined.

With reference to FIG. 26, a method for determining the presence or absence of rotation of a projection image according to the fifth embodiment will be schematically described. FIG. 26 (a) in the case whereas among the adjustment projected image 30 ₄₀ and 30 ₄₁ (adjustment projection image 30 ₄₁₎ is rotating at an angle θ with respect to the other, each of the regions # 1, # 2 And an example of luminance of # 3 is shown.

As described with reference to FIG. 20, when one adjustment projection image is rotated at an angle θ, the luminance L _{S at} the start point of scanning and the luminance L _{E at the} end point are different. Therefore, if shown in FIG. 25 (a) and FIG. 25 (b) for adjustment shown in the projection image 30 ₄₀ and 30 _41, the luminance L ₃ region # 3 at the lower end, is different from the luminance L ₁ of the region # 1 at the upper end It will be. In the example of FIG. 26A, the luminance L ₃ > the luminance L _1, and the adjustment projection image 30 ₄₁ is based on the adjustment projection image 30 ₄₀ corresponding to the example of FIG. The case where it rotates in the clockwise direction is shown.

When the adjustment projection images 30 ₄₀ and 30 ₄₁ have a correct angular relationship, as illustrated in FIG. 26B, luminance L ₁ = luminance L ₃ .

In the fifth embodiment, the angle adjustment process and the position adjustment process of the projected image are performed in the same procedure as in FIG. At this time, the angle adjustment process in step S200 of FIG. 23 can be executed by replacing the luminance L _E with luminance L ₁ and the luminance L _S with luminance L _{3 in the} flowchart shown in FIG. 24 as the details of step S200. It is.

With reference to FIG. 27, the luminance acquisition position when the overlapping region ₃₃₄₂ is scanned according to the fifth embodiment will be described. Based on the adjustment projection image 30 ₄₀ shown in FIG. 27 (a), illustrated in FIG. 27 (b), by superimposing the adjustment projection image 30 ₄₁ rotating in a counterclockwise direction at an angle theta, region 33 ₄₀ and 33 ₄₁ form an overlapping region 33 ₄₂ overlapping (see FIG. 27 (c)).

With reference to FIG. 27C, the region 3100 where the region 3090 overlaps the region 3080 is referred to as the region # 1 described above, and the region 3101 where the region 3091 overlaps the region 3081 is referred to as the region # 2 described above. The area 3102 where the area 3092 overlaps the area 3082 is defined as the above-described area # 3. The analysis unit 1210 determines the presence / absence of rotation by using the luminance acquired from the portions corresponding to the regions # 1, # 2, and # 3 among the luminances obtained by scanning the overlapping region ₃₃₄₂ in the vertical direction. I do. Each of these areas # 1, # 2, and # 3 can be detected based on, for example, the edge of the luminance change obtained by scanning the overlapping area ₃₃₄₂ in the vertical direction.

Luminance detection method in the overlap region 33 _42, can be applied to the fourth embodiment described above.

According to this fifth embodiment, for example in the region 33 _40, second region (e.g., region direction adjacent and brightness of inclination different from each other among the regions 3080,3081 and 3082 included in the area 33 ₄₀ 3080 and 3081) can be used to execute the position adjustment process according to the first to third embodiments. Therefore, it is not necessary to switch the projection image data to be output in the image output device 11 when the process proceeds to the position adjustment process in step S201 after the angle adjustment process in step S200 of FIG. 23 is completed.

(First Modification of Fifth Embodiment)
Next, a first modification of the fifth embodiment will be described. The first modification of the fifth embodiment is the first region according to the fifth embodiment in which the luminance gradient is the first direction and is formed on one end side, and the luminance gradient is the first direction. The combination of the second region orthogonal to the second region and the third region having the luminance gradient in the first direction and formed on the other end side is the same as in the first modification of the first embodiment described above. In this example, two or more are provided for one adjustment image. Hereinafter, a set of the first area, the second area, and the third area is referred to as an “angle adjustment area set”.

FIG. 28 shows an example of an adjustment projection image according to the first modification of the fifth embodiment. In FIG. 28, each adjustment projection image 30 ₅₀ , 30 ₅₁ , 30 _52, and 30 ₅₃ has a set of angle adjustment regions on two sides that share a vertex. In this way, by providing a set of two angle adjustment areas in the adjustment projection image, the angle adjustment method according to the fifth embodiment described above is applied when four projection images are projected onto a common screen. Can do.

More specifically, the adjustment projected image 30 ₅₀ 4 projected in a lattice pattern, 30 _51, of 30 ₅₂ and 30 _53, the adjustment projection image 30 ₅₀ projected on the upper left, the right end, gradation region A set of angle adjustment areas including 3501, 3502 and 3503 is arranged, and a set of angle adjustment areas including gradation areas 3504, 3505 and 3506 is arranged at the lower end.

Also, adjusting the projected image 30 ₅₁ projected on the upper right, the left end, the angle adjustment including gradation area 3501, 3502 and gradation area 3511,3512 and 3513 direction is opposite each of the slope of luminance relative to 3503 A set of areas is arranged, and a set of angle adjustment areas including gradation areas 3514, 3515, and 3516 is arranged at the lower end.

Furthermore, the angle adjustment projected image 30 ₅₃ to be projected, comprising a top end, a gradation region 3514,3515 and gradation area 3534,3535 and 3536 which direction is opposite each of the slope of luminance relative to 3516 in the lower right A set of adjustment areas is arranged, and a set of angle adjustment areas including gradation areas 3531, 3532 and 3533 is arranged at the left end.

Furthermore, the angle adjustment projected image 30 ₅₂ projected to lower left, including the upper end, a gradation region 3504,3505 and gradation area 3524,3525 and 3526 in which the direction of inclination of the luminance is opposite respectively 3506 A set of adjustment areas is arranged, and a set of angle adjustment areas including gradation areas 3521, 3522, and 3523 in which the luminance inclination directions are opposite to the gradation areas 3531, 3532, and 3533 are arranged at the right end. .

The four adjustment projection images 30 ₅₀ , 30 ₅₁ , 30 _52, and 30 ₅₃ are projected onto the screen 14 such that the sets of angle adjustment regions arranged on opposite sides overlap to form overlapping regions. Then, for example, based on the projection position of the adjusting projection image 30 _50, and the adjustment projection image 30 ₅₁ adjacent to the adjustment projected image 30 _50, for the adjustment projection image 30 _52, adjust the angle of the projected image. After the adjustment of the emission positions of the adjustment projection images 30 ₅₁ and 30 ₅₂ is completed, the angle adjustment of the projection image of the adjustment projection image 30 ₅₃ is performed using either one of the adjustment projection images 30 ₅₁ and 30 ₅₂ as a reference. Do.

After the adjustment of the injection position of the adjustment projection images 30 ₅₀ , 30 ₅₁ , 30 ₅₂ and 30 ₅₃ is completed, the adjustment projection image other than the adjustment projection image 30 ₅₀ used as a reference is used as a reference again as necessary. The angle adjustment of the projected image may be executed.

(Second Modification of Fifth Embodiment)
Next, a second modification of the fifth embodiment will be described. In the first modification of the fifth embodiment described above, the number of projection images that can be simultaneously projected on the screen 14 is limited to four. In the second modification of the fifth embodiment, an upper limit on the number of projection images that can be simultaneously projected on the screen 14 is eliminated by arranging a set of angle adjustment regions on each side.

FIG. 29 shows a first example of an adjustment projection image in the second modification of the fifth embodiment. In FIG. 29A, the adjustment projection image 30 ₆₀ is provided with two sets of angle adjustment regions in which the inclination directions of the respective regions are opposite to each other on opposite sides of the adjustment projection image 30 ₆₀ . .

That is, in the example of FIG. 29 (a), the adjustment projection image 30 _60, the upper end, the angle adjustment regions including respective upper end, a gradation region 3601,3602 and 3603 decreases brightness toward the right end and the upper end A set of angle adjustment areas including gradation areas 3604, 3605, and 3606 in which the luminance decreases toward the lower end side, the left end side, and the lower end side, respectively, is arranged on opposite sides. Also, adjusting the projected image 30 _60, the left end, respectively left side, is set is arranged in the angle adjustment region including the gradation area 3607,3608 and 3609 decreases brightness toward the upper side and the left side, opposite sides Further, gradation regions 3610, 3611, and 3612 in which the luminance decreases toward the right end side, the lower end side, and the right end side are arranged, respectively. This pattern shown in FIG.

Adjusting the projected image 30 ₆₀ of the pattern C may be as illustrated in FIG. 29 (b), with overlapping sets of angular adjustment region of the adjustment projected image adjacent, arranged in a matrix. In the example of FIG. 29B, nine adjustment projection images 30 ₆₀ are projected in a matrix, but this is not limited to this example, and more adjustment projection images 30 ₆₀ are projected in a matrix. may be, it may be projected the adjustment projection image 30 ₆₀ less than 9. Of course, only the two adjustment projection images 30 ₆₀ may be projected.

  FIG. 30 shows a second example of the adjustment projection image according to the second modification of the fifth embodiment. In the second example, two patterns of adjustment projection images with different configurations of the set of angle adjustment regions arranged on each side are prepared. The two patterns of adjustment projection images are projected in a matrix so that the same pattern of adjustment projection images are not adjacent to each other. That is, in this second example, two patterns of adjustment projection images are projected in a checkered pattern.

FIG. 30A shows an example of the adjustment projection image of the pattern D that is the first pattern, and FIG. 30B shows an example of the adjustment projection image of the pattern E that is the second pattern. The adjustment projection image 30 ₇₀ shown in FIG. 30A and the adjustment projection image 30 ₈₀ shown in FIG. 30B are two angles at which the inclination directions of the respective regions are the same. A set of adjustment areas is provided on opposite sides.

In FIG. 30 (a), the adjustment projected image 30 ₇₀ of a pattern D, the angle adjustment including the upper and lower ends, respectively upper side, the gradation region 3701,3702 and 3703 decreases brightness toward the left side and upper side A set of areas and a set of angle adjustment areas including gradation areas 3704, 3705, and 3706 are arranged. Also, adjusting the projected image 30 ₇₀ to left and right edges, a pair of angle adjustment regions including respective right end side, the gradation region 3707,3708 and 3709 to reduce the brightness toward the lower side and right side, gradation region 3710, A set of angle adjustment regions including 3711 and 3712 is arranged.

On the other hand, in FIG. 30 (b), the adjustment projection image 30 ₈₀ of a pattern E, including the upper and lower ends, respectively lower side, the gradation area 3801 and 3803 to reduce the brightness toward the right end side and lower end side A set of angle adjustment areas and a set of angle adjustment areas including gradation areas 3804, 3805 and 3806 are arranged. Also, adjusting the projected image 30 ₈₀ to left and right edges, a pair of angle adjustment regions including respective left side, the gradation region 3807,3808 and 3809 to reduce the brightness toward the upper side and the left side, the gradation region 3810, A set of angle adjustment regions including 3811 and 3812 is arranged.

And the adjustment projection image 30 ₇₀ of these pattern D, the adjusting projection image 30 ₈₀ of a pattern E, as illustrated in FIG. 30 (c), can be projected in a checkerboard pattern. Further, in the example of FIG. 30 (c), the and the adjustment projection image 30 ₇₀ of a pattern D of 5, and is projected on the adjustment projection image 30 ₈₀ checkered pattern-like fourth pattern E. This is not limited to this example, and more adjustment projection images 30 ₇₀ and 30 ₈₀ may be projected in a checkered pattern, or less than nine adjustment projection images 30 ₇₀ and 30 ₈₀ may be projected in total. May be. Of course, it may be projected only 2 of adjusting the projected image 30 ₇₀ and 30 _80.

  In the first example and the second example of the second modification of the fifth embodiment, the adjustment procedure described in the second modification of the first embodiment can be applied as it is. Detailed description here is omitted.

(Other embodiments)
The adjustment device 12 (adjustment device 1200) according to each embodiment includes an analysis unit 120 (analysis unit 1210) and a control unit 121 (control unit 121 ′, control unit 121 ″, control unit 1211) that are independent of each other. The analysis unit 120 (analysis unit 1210) and the control unit 121 (control unit 121 ′, control unit 121 ″, control unit 1211 may be configured by an image adjustment program that operates on a CPU (Central Processing Unit). ) Function may be realized.

  When each functional unit of the adjustment device 12 (adjustment device 1200) is realized by an image adjustment program operating on the CPU, the adjustment device 12 (adjustment device 1200) includes a CPU, a ROM (Read Only Memory), and a RAM (Random Access Memory). ) And a data I / F (interface), and the CPU is configured to control the overall operation of the adjustment device 12 (adjustment device 1200) using the RAM as a work memory in accordance with a program stored in the ROM. Is done.

In the first embodiment, the data I / F is used as an interface for supplying a control signal to the lens shift units 105 ₁ and 105 ₂ of the projector apparatuses 10 ₁ and 10 ₂ . Further, in the second embodiment, it is used as an interface when supplying control signals to the pedestal driving units 106 ₁ and 106 ₂ of the projector apparatuses 10 ₁ and 10 ₂ . Further, in the fourth and fifth embodiments, the data I / F is used as an interface when supplying control signals to the rotation mechanism units 1010 ₁ and 1010 ₂ of the projector apparatuses 1000 ₁ and 1000 _2. Used. Furthermore, it is possible to control the operation of the camera 13 via the data I / F. Furthermore, as in the first and second modifications of the first embodiment, when a large number of adjustment projection images are projected, communication is performed between the projector apparatuses that project the adjustment projection images. Data I / F may be used as the interface. You may further provide communication I / F which communicates via the network with respect to the adjustment apparatus 12 (adjustment apparatus 1200).

  The image adjustment program of each embodiment is configured to be provided by being stored on a computer connected via a network and downloaded via the network. Further, the image adjustment program of each embodiment may be configured to be provided or distributed via the network. This program can be provided by being stored in the ROM in advance.

  The program of the embodiment is not limited to this, and is provided by recording it in a computer-readable recording medium such as a CD (Compact Disk) or a DVD (Digital Versatile Disk) as a file in an installable or executable format. May be. In this case, for example, the image adjustment program is supplied to the adjustment device 12 via an external drive device connected to the data I / F.

  The image adjustment program according to each embodiment includes, for example, a module configuration including the above-described units (the analysis unit 120 (analysis unit 1210) and the control unit 121 (or control unit 121 ′, control unit 121 ″, control unit 1211)). As actual hardware, the CPU reads the image adjustment program from the ROM, for example, and executes it, so that the above-described units are loaded onto the main storage device (for example, RAM), and the respective units are generated on the main storage device. It has come to be.

In the above description, the camera 13, the adjustment device 12 (adjustment device 1200), the image output device 11, and the projector device 10 ₁ (projector device 10 ₂ , projector device 1000 ₁ , projector device 1000 ₂ ) are independent hardware. However, this is not limited to this example.

  For example, the adjustment device 12 (adjustment device 1200) and the image output device 11 may be integrally configured, or the camera 13 may be further included in this configuration. In this case, a configuration in which the camera 13, the adjustment device 12 (adjustment device 1200), and the image output device 11 are integrated can be realized by using a multifunctional mobile phone device such as a smartphone or a tablet computer.

Furthermore, the camera 13, the adjusting device 12 (adjusting device 1200), and the image output device 11 can be incorporated into the projector device 10 ₁ (projector device 10 ₂ , projector device 1000 ₁ , projector device 1000 ₂ ). In this case, the camera 13, the adjusting device 12 (regulator 1200) and the image output apparatus 11 is incorporated for example the projector 10 _1, the control data by the control unit 121, or the control by the control unit 121 '(control unit 1211) Position adjustment processing similar to that described above can be performed using another projector apparatus corresponding to the signal.

In addition, the present invention is not limited to this, and the camera 13, the adjustment device 12 (adjustment device 1200), and the projector device 10 ₁ incorporating the image output device 11 (projector device 10 _2, projector device 1000 ₁ , projector device 1000 ₂ ), and control You may use the other projector apparatus which does not respond | correspond to the control data by the part 121, or the control signal by control part 121 '(control part 1211). In this case, for example, the projector device 10 ₁ and another projector device project the adjustment projection images 30 ₁ and 30 _{2 so} that the overlapping region 33 ′ is generated, and the camera 13 in which the projector device 10 ₁ is incorporated is used. The entire projection image 300 is captured. The adjustment device 12 controls the lens shift section 105 ₁ of the projector apparatus 10 ₁ based the entire projected image 300 in captured image captured adjusts the position.

1, 1 ′ multi-projector system 10 ₁ , 10 ₂ , 1000 ₁ , 1000 ₂ projector device 11 image output device 12, 1200 adjustment device 13 camera 14 screen 20 ₁ , 20 ₂ projected images 21, 33 ′, 33 ₃₀ , 33 ₄₂ Overlapping regions 30 ₁ , 30 ₂ , 30 ₁₀ , 30 ₁₁ , 30 ₁₂ , 30 ₁₃ , 30 ₂₀ , 30 ₂₁ , 30 ₃₀ , 30 ₃₁ , 30 ₄₀ , 30 ₄₁ , 30 ₅₀ , 30 ₅₁ , 30 ₅₂ , 30 ₅₃ , 30 ₆₀ , 30 ₇₀ , 30 ₈₀ Adjusting projection images 105 ₁ , 105 ₂ Lens shift units 106 ₁ , 106 ₂ Base drive units 107 ₁ , 107 ₂ Frame memory 110 Image output units 120, 1210 Analyzing units 121, 121 ′, 121 1211 Control unit 300 Whole projected image 310, 311, 320, 321, 3000 to 3003, 3010 to 3013, 3020 to 3023 030～3033,3041～3048,3051～3058,3501～3536,3601～3612,3701～3712,3801～3812 gradation area

Claims (17)

Two or more projection devices including a first projection device and a second projection device, an image output device that outputs an image to each of the two or more projection devices, and a target of a projection image projected by the two or more projection devices An adjustment device that adjusts each projection position on the projection medium, and the first projection image emitted by the first projection device and the second projection image emitted by the second projection device overlap each other. A multi-projector system that is projected onto a projection medium so as to have
Each of the projection devices
A light emitting unit that modulates light from a light source according to an input image and emits it as a projection image;
An angle adjusting unit that adjusts an angle of the projection image emitted by the light emitting unit;
The image output device includes:
A first adjustment image in which a first gradation area in which luminance is inclined in a first direction is formed in an area corresponding to the overlapping area of the first projection image; and the second projection In a region corresponding to the overlapping region of the image, a second gradation region whose luminance is inclined toward a second direction opposite to the first direction and is disposed at a position corresponding to the first gradation region And an output unit that outputs the second adjustment image formed as the input image of the first projection device and the second projection device, respectively.
The adjusting device is
An imaging unit that captures a projected image projected on the projection medium and outputs a captured image;
Analyzing the captured image, the first projection image projected on the projection medium by the first projection device based on the first adjustment image, and the second projection device secondly. The first gradation area and the second gradation area included in the overlapping area with the second adjustment projection image projected on the projection medium based on the adjustment image of the first, An analysis unit for acquiring a luminance change in a direction perpendicular to the direction of
A control unit that outputs a first control signal for controlling the angle adjustment unit of the projection apparatus so that the luminance change acquired by the analysis unit falls within a predetermined range. Multi-projector system. Each of the projection devices
An emission position adjusting unit that adjusts an emission position of light by the light emitting unit by control of the adjusting device;
The output unit is
In addition to the first adjustment image, the brightness is inclined toward a third direction intersecting the first direction in a region corresponding to the overlapping region of the first projection image. And a fourth direction whose luminance is opposite to the third direction in a region corresponding to the overlapping region of the second projection image with respect to the second adjustment image. A fourth gradation area inclined toward the third gradation area is formed at a position corresponding to the third gradation area, and at least one of the first projection image and the second projection image is the first to fourth. A reference area with uniform brightness is formed in an area other than the gradation area,
The analysis unit
By analyzing the captured image, an area where the first gradation area and the second gradation area included in the overlapping area between the first adjustment projection image and the second adjustment image overlap. The first luminance of each pixel acquired with the first predetermined pixel and the first luminance of each pixel acquired with the second predetermined pixel in the region where the third gradation region and the fourth gradation region overlap. 2 and a luminance of the reference area are further acquired,
The controller is
A second control signal for controlling the emission position adjusting unit of the projection apparatus so that the first luminance and the second luminance acquired by the analyzing unit respectively match the luminance of the reference region ; The multi-projector system according to claim 1, further outputting. The adjusting device is
After the angle adjustment unit is controlled by the first control signal, the control unit acquires the first luminance, the second luminance, and the luminance of the reference region from the captured image by the analysis unit, and the control unit The multi-projector system according to claim 2, wherein the second control signal is output based on the first luminance, the second luminance, and the luminance of the reference region . The controller is
Based on the first luminance, the second luminance, and the luminance of the reference region , the first movement distance of the emission position with respect to the inclination direction of the first gradation region, and the third gradation region Calculating a second movement distance with respect to the direction of inclination, and generating the second control signal for moving the injection position according to the calculated first movement distance and second movement distance. The multi-projector system according to claim 2 or 3. The controller is
And the luminance of the reference region, to calculate the ratio between the difference of the luminance of the first luminance and the reference area, the first moving distance based on the width of the slope of the first gradation area, to calculate the luminance of the reference region, and the ratio between the difference of the luminance of the second luminance and the reference area, the second moving distance based on the width of the slope of the third gradation area The multi-projector system according to claim 4. The imaging unit
Of the first adjustment projection image and the second adjustment projection image projected on the projection medium, the imaging is performed including at least the overlap region and a predetermined range outside the overlap region adjacent to the overlap region. The multi-projector system according to claim 2, wherein the captured image is output. The imaging unit
7. The luminance resolution capable of recognizing a gradation corresponding to the number of pixels included in the width of the first to fourth gradation areas in the luminance gradient direction. The multi-projector system according to any one of the above. The injection position adjustment unit is
8. The multi-projector system according to claim 2, wherein the light emission position is adjusted by moving an optical axis of light emitted from the light emission unit. The injection position adjustment unit is
The multi-projector system according to claim 2, wherein the light emission position is adjusted by moving the position of the projection device. The light emitting part is
A light modulation element that modulates light from the light source according to the input image;
The injection position adjustment unit is
The multi-projector system according to claim 2, wherein the light emission position is adjusted by moving the position of the input image on the light modulation element. The light emitting part is
A light modulation element that modulates light from the light source according to the input image;
The angle adjuster is
11. The multi-projector according to claim 1, wherein an angle of the projection image is adjusted by rotating the light modulation element about an optical axis that emits the projection image. system. The light emitting part is
A light modulation element that modulates light from the light source according to the input image;
The angle adjuster is
The multi-projector system according to claim 1, wherein an angle of the projection image is adjusted by rotating the input image. The angle adjuster is
11. The multi-projector system according to claim 1, wherein the angle of the projection image is adjusted by rotating the projection device in a plane facing the projection medium. A light emitting unit that modulates light from a light source according to an input image and emits it as a projection image;
An angle adjusting unit for adjusting an angle of the projection image emitted by the light emitting unit;
An imaging unit that captures a projected image projected on the projection medium and outputs a captured image;
The brightness is inclined in the first direction in an area corresponding to an overlapping area of the first projection image emitted from the light emitting unit and the second projection image projected by another projector device. A first adjustment projection image projected from the light emitting unit on the projection medium based on the first adjustment image in which one gradation region is formed, and the second projection projected by another projector device. In a region corresponding to the overlapping region of the image, a second gradation region whose luminance is inclined toward a second direction opposite to the first direction and is disposed at a position corresponding to the first gradation region Of the first gradation area and the second gradation area included in the overlapping portion with the second adjustment projection image based on the second adjustment image formed with the first adjustment image. Direction perpendicular to direction An analysis unit a brightness change, acquires and analyzes the captured image,
Projector, characterized in that a control unit for the brightness change acquired by the analysis unit generates and outputs a control signal for controlling the pre-Symbol angle adjustment portion so as to be within a predetermined range apparatus. In the region corresponding to the overlapping region of the first projection image emitted from the light emitting unit of the first projector device and the second projection image projected by the second projector device, the luminance is in the first direction. A first adjustment projection image projected from the light emitting unit onto the projection medium based on the first adjustment image formed with the first gradation region inclined toward the first projection area, and the second projector device projected In the region corresponding to the overlapping region of the second projection image, the luminance is inclined in a second direction opposite to the first direction, and is arranged at a position corresponding to the first gradation region. An area where the first gradation area and the second gradation area included in the overlapping portion with the second adjustment projection image based on the second adjustment image in which the second gradation area is formed overlap Of the first direction and The direction of the change in luminance straight, an analysis unit for acquiring projection image projected to said projection medium by analyzing the captured image captured,
The angle of the first projection image from the first projector device and the second from the second projector device so that the luminance change acquired by the analysis unit falls within a predetermined range. An adjustment apparatus comprising: a control unit that generates and outputs a control signal for controlling the angle adjustment unit with respect to an angle adjustment unit that adjusts the angle of each projection image . In the region corresponding to the overlapping region of the first projection image emitted from the light emitting unit of the first projector device and the second projection image projected by the second projector device, the luminance is in the first direction. A first adjustment projection image projected from the light emitting unit onto the projection medium based on the first adjustment image formed with the first gradation region inclined toward the first projection area, and the second projector device projected In the region corresponding to the overlapping region of the second projection image, the luminance is inclined in a second direction opposite to the first direction, and is arranged at a position corresponding to the first gradation region. An area where the first gradation area and the second gradation area included in the overlapping portion with the second adjustment projection image based on the second adjustment image in which the second gradation area is formed overlap Of the first direction and The luminance change in the direction of the straight, an analysis step of acquiring a projection image projected to said projection medium by analyzing the captured image captured,
The angle of the first projection image from the first projector device and the second from the second projector device so that the luminance change acquired by the analysis step falls within a predetermined range. And a control step of generating and outputting a control signal for controlling the angle adjusting unit for an angle adjusting unit for adjusting the angle of each projection image . An adjustment program for causing a computer to execute the adjustment method according to claim 16.