JP2009237240A - Image adjusting device, image display system, and image adjusting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image adjusting device capable of preventing deterioration of a plurality of displayed images arranged in parallel and to provide an image display system including this device and an image adjusting method by use of this device. <P>SOLUTION: This image adjusting device for adjusting a plurality of displayed images arranged in parallel includes an image information acquiring part for acquiring image information corresponding to chromaticity components at measuring points in end parts in adjacent regions of two adjacent images among a plurality of images and an image quality adjustment controlling part for controlling adjustment of quality of at least one image among a plurality of images to make a value of evaluation function of color difference between the measuring points maximum or minimum based on the image information acquired by the image information acquiring part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image adjustment apparatus, an image display system including the image adjustment apparatus, and an image adjustment method.

In a multi-display system, a plurality of images displayed by one or a plurality of image display devices are arranged so as to be adjacent to each other, thereby displaying a large screen image or displaying a plurality of types of images at a time. Can do. One such multi-display system is a multi-projector system that uses a plurality of projectors that are projection-type image display devices. Similar to a general projector system constituted by a single projector, there is a high demand for high-quality display images in this multi-projector system, and it is necessary to adjust individual performance variations of a plurality of projectors constituting the system. To improve image quality.

For example, Patent Document 1 discloses an automatic adjustment system for a multi-display device. In Patent Document 1, a camera is arranged in front of a plurality of projection displays, the brightness of the center point of each projection display image or a block obtained by dividing the image is measured, and the amplification factor is based on the measurement result. Has been disclosed that controls the brightness of the projection image of each projection type display so as to be uniform.

JP-A-7-64522

However, in Patent Document 1, since the measurement result of the brightness of the center point of each projection display image or the block obtained by dividing the image is used, pixels separated from the center point of the image or the block obtained by dividing the image. There is a problem in that the brightness of the screen decreases. Therefore, when an image is displayed with a plurality of adjacent projection images, the boundary between the projection images is conspicuous and the image quality is deteriorated.

The present invention has been made in view of the technical problems as described above, and one of its purposes is as follows.
An object of the present invention is to provide an image adjustment apparatus that suppresses deterioration in image quality of a display image in which a plurality of images are arranged side by side, an image display system including the image adjustment system, and an image adjustment method.

In order to solve the above-described problem, the present invention provides an image adjustment device that adjusts a display image in which a plurality of images are arranged side by side, and includes an end in an adjacent region of each of two adjacent images among the plurality of images. An image information acquisition unit that acquires image information at a measurement point of the unit, and a value of an evaluation function between the measurement points based on the image information acquired by the image information acquisition unit is maximized or minimized. The present invention relates to an image adjustment apparatus including an image quality adjustment control unit that performs control to adjust at least one image quality of a plurality of images.

According to the present invention, image information at the measurement points at the end portions in the adjacent regions of two adjacent images among a plurality of images is acquired, and the value of the evaluation function between the measurement points is maximized or minimized. Since control for adjusting at least one image quality of a plurality of images is performed, it is possible to suppress deterioration in image quality of a display image in which a plurality of images are arranged side by side.

The present invention is also an image adjustment device for adjusting a display image in which a plurality of images are arranged side by side, wherein the colors at the measurement points at the end portions in the adjacent regions of the two adjacent images of the plurality of images. An image information acquisition unit that acquires image information corresponding to a degree component, and a value of an evaluation function of a color difference between the measurement points based on the image information acquired by the image information acquisition unit is maximized or minimized. And an image adjustment apparatus including an image quality adjustment control unit that performs control to adjust at least one image quality of the plurality of images.

According to the present invention, the image information corresponding to the chromaticity component at the measurement point at the end in the adjacent region of each of the two adjacent images among the plurality of images is acquired, and the value of the evaluation function of the color difference between the measurement points is acquired. Since the control for adjusting the image quality of at least one of the plurality of images is performed so that the maximum or the minimum becomes the minimum, the adjustment of the last projected image is repeated by repeatedly adjusting the luminance and chromaticity of two adjacent projected images. Thus, it becomes possible to avoid the situation where the image quality becomes impossible, and even in such a situation, the deterioration of the image quality of the display image in which all the projected images are displayed side by side as a whole can be suppressed.

In the image adjustment apparatus according to the present invention, the image quality adjustment control unit may be configured such that the sum of color differences between the measurement points obtained for each two adjacent images among the plurality of images is minimized. Control for adjusting at least one of the image quality can be performed.

According to the present invention, when there is uneven color in each image constituting a plurality of images, even if the color difference cannot be “0” at all the boundaries of the plurality of images, the display in which the plurality of images are arranged side by side It becomes possible to suppress the deterioration of the image quality.

In the image adjustment apparatus according to the present invention, the image quality adjustment control unit can perform control to adjust at least one image quality of the plurality of images so that the maximum value of the color difference between the measurement points is minimized. .

According to the present invention, when there is uneven color in each image constituting a plurality of images, even if the color difference cannot be “0” at all the boundaries of the plurality of images, the display in which the plurality of images are arranged side by side It becomes possible to suppress the deterioration of the image quality.

In the image adjustment apparatus according to the present invention, the image quality adjustment control unit obtains at least one image quality of the plurality of images so that a value of the evaluation function is maximized or minimized at each gradation constituting the plurality of gradations. Control to adjust can be performed.

According to the present invention, even when a plurality of types of images are displayed in a display image in which a plurality of images are arranged, it is possible to avoid a situation in which the image quality deteriorates due to the images.

In the image adjustment apparatus according to the present invention, it is possible to perform control for adjusting at least one image quality of the plurality of images so that the gray axes in the respective gradations constituting the plurality of gradations coincide with each other.

According to the present invention, it is possible to prevent deterioration in image quality due to a different hue for each gradation by changing only the hue without changing the value of the evaluation function between measurement points.

Further, in the image adjustment device according to the present invention, the image information acquisition unit corresponds to image information corresponding to chromaticity components at a plurality of measurement points at end portions in adjacent regions of two adjacent images among the plurality of images. The image quality adjustment control unit performs control to adjust at least one image quality of the plurality of images based on the image information at the plurality of measurement points acquired by the image information acquisition unit. it can.

According to the present invention, it is possible to suppress deterioration in image quality of a display image in which a plurality of images are arranged side by side with higher accuracy.

Further, the present invention includes a plurality of image display devices that display a plurality of images constituting a display image, and the image adjustment device according to any one of the above, wherein the image adjustment device includes at least one of the plurality of images. The present invention relates to an image display system that adjusts image quality.

According to the present invention, it is possible to provide an image display system to which an image adjustment apparatus that suppresses deterioration in image quality of a display image in which a plurality of images are arranged side by side is applied.

The present invention is also an image adjustment method for adjusting a display image in which a plurality of images are arranged side by side, wherein the colors at the measurement points at the ends in the adjacent regions of two adjacent images of the plurality of images. An image information acquisition step for acquiring image information corresponding to the degree component, and a value of an evaluation function of a color difference between the measurement points based on the image information acquired in the image information acquisition step is maximized or minimized. , And an image quality adjustment control step for performing control for adjusting image quality of at least one of the plurality of images.

According to the present invention, the image information corresponding to the chromaticity component at the measurement point at the end in the adjacent region of each of the two adjacent images among the plurality of images is acquired, and the value of the evaluation function of the color difference between the measurement points is acquired. Since the control for adjusting the image quality of at least one of the plurality of images is performed so that the maximum or the minimum becomes the minimum, the adjustment of the last projected image is repeated by repeatedly adjusting the luminance and chromaticity of two adjacent projected images. Thus, it becomes possible to avoid the situation where the image quality becomes impossible, and even in such a situation, the deterioration of the image quality of the display image in which all the projected images are displayed side by side as a whole can be suppressed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

Hereinafter, a projector will be described as an example of the image display apparatus according to the present invention, but the present invention is not limited to this.

Embodiment 1
As shown below, the image display system according to the present invention uses a plurality of projectors as projection-type image display devices, and displays the images by arranging the projected images on the screen by the projectors side by side. It is.

FIG. 1 shows a configuration example of a multi-projector system according to the first embodiment of the present invention. In FIG. 1, the multi-projector system is configured by four projectors, but the present embodiment is not limited to the number of projectors, and may be configured by N (N is a natural number of 2 or more) projectors. That's fine.

The multi-projector system 10 according to the first embodiment includes first to fourth projectors P.
J1-PJ4, the image adjustment apparatus 200, and the image measurement part 300 are included. The first to fourth projectors PJ1 to PJ4 project an image onto the screen SCR to thereby provide first to fourth projection images I.
MG1 to IMG4 (images in a broad sense) are displayed. The first to fourth projectors P
An image is displayed by arranging and displaying the projected images on the screen SCR by the projectors constituting J1 to PJ4 so as to be adjacent to each other.

The projection images constituting the first to fourth projection images IMG1 to IMG4 may be displayed so that the adjacent image and the boundary portion thereof are in contact with each other, or are displayed at a given interval from the adjacent image. May be. In FIG. 1, the first to fourth projection images IMG1 to IMG4 are displayed side by side in two images in the horizontal direction (lateral direction, left and right direction) and two images in the vertical direction (vertical direction, vertical direction). However, the present embodiment is not limited to the number of images arranged in one direction.

The first to fourth projectors PJ1 to PJ4 may have the same configuration,
Different configurations may be used. However, each projector constituting the first to fourth projectors PJ1 to PJ4 has a function of adjusting the luminance and chromaticity of the entire screen.

The image adjustment apparatus 200 adjusts the luminance and chromaticity of the images of the first to fourth projection images IMG1 to IMG4 projected by the first to fourth projectors PJ1 to PJ4. Therefore, the image adjustment apparatus 200 calculates adjustment parameters for adjusting the luminance and chromaticity of the image,
The adjustment parameter can be transmitted to at least one of the fourth projectors PJ1 to PJ4. The projector that has received the adjustment parameter adjusts the brightness and chromaticity of the entire screen based on the adjustment parameter. Such an image adjustment apparatus 200 includes the image measuring unit 3.
The adjustment parameter is calculated using the measurement result of the projected image by 00.

The image measurement unit 300 can measure a projection image on the screen SCR by the projector and output the measurement result to the image adjustment apparatus 200 as image information. Only one image measurement unit 300 may be provided in the multi-projector system 10, or may be provided for each projector. The function of the image measuring unit 300 is realized by, for example, a digital camera, a colorimeter, a colorimeter, or the like, but the image measuring unit 300 only needs to be able to measure image information such as luminance for one pixel constituting the projection image.

In the multi-projector system 10 as described above, the image adjustment device 200 acquires image information corresponding to chromaticity components at measurement points (measurement pixels) in adjacent regions (boundary regions) of two adjacent projection images. Control for adjusting at least one image quality of the first to fourth projectors PJ1 to PJ4 is performed so that the value of the evaluation function between the measurement points becomes maximum or minimum. More specifically, the value of the evaluation function of the color difference between the measurement points is maximized or minimized,
Control is performed to adjust at least one image quality of the first to fourth projectors PJ1 to PJ4. By doing so, it is possible to suppress deterioration in image quality of a display image in which a plurality of images are arranged side by side. Furthermore, the projection image of each projector has uneven color, and compared with the case where the image quality is adjusted for every two adjacent projection images, the color difference between the plurality of projection images can be made smaller, and the display image of the plurality of projection images can be reduced. A reduction in image quality can be suppressed.

Next, each device constituting the multi-projector system 10 will be described in detail.

FIG. 2 is a block diagram illustrating a configuration example of the multi-projector system 10 according to the first embodiment. In FIG. 2, it is assumed that the number of projectors is N. That is, FIG. 1 corresponds to a configuration diagram when N is “4” in FIG. 2. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In FIG. 2, the first to Nth projectors PJ
It is assumed that the projectors 1 to PJN have the same configuration, and the image adjustment apparatus 200 supplies image data to each projector.

The first projector PJ1 includes an image display unit 100, a luminance / chromaticity adjustment unit 180, and an image data input unit 190. The image data input unit 190 performs reception interface processing of image data from the image adjustment apparatus 200 and outputs it as an image signal. This reception interface processing includes physical layer signal level conversion processing and progressive conversion processing. The luminance / chromaticity adjustment unit 180 corrects the image signal from the image data input unit 190 based on the adjustment parameter from the image adjustment apparatus 200 and outputs the corrected image signal to the image display unit 100. The image display unit 100 projects the modulated light onto the screen SCR by changing the modulation rate of the light from the light source based on the image signal adjusted (corrected) by the luminance / chromaticity adjustment unit 180.

FIG. 3 is a block diagram showing a configuration example of the luminance / chromaticity adjustment unit 180 shown in FIG. In FIG. 3, the same parts as those in FIG.

The luminance / chromaticity adjustment unit 180 includes an adjustment parameter storage unit 182 and a signal conversion unit 184. The adjustment parameter storage unit 182 stores the adjustment parameters from the image adjustment apparatus 200. The signal conversion unit 184 corrects the image signal from the image data input unit 190 based on the adjustment parameter stored in the adjustment parameter storage unit 182, and converts the corrected image signal into the image display unit 10.
Output to 0.

For example, adjustment parameters for all gradations that can be expressed by image data are stored in the adjustment parameter storage unit 182, and the signal conversion unit 184 is based on the adjustment parameters corresponding to the gradations specified by the image signal. The image signal before correction can be corrected. Alternatively, for example, some adjustment parameters are discretely stored in the adjustment parameter storage unit 182 among all the gradations that can be expressed by the image data, and the signal conversion unit 184 sets the gradations specified by the image signal. The image signal before correction can be corrected based on the corresponding adjustment parameter or the adjustment parameter obtained by interpolating the adjustment parameter stored in the adjustment parameter storage unit 182.

FIG. 4 shows a configuration example of the image display unit 100 of FIG. In FIG. 4, the first projector PJ
Although one image display unit 100 shows a so-called three-plate type configuration example, the image display unit according to the present invention is not limited to a so-called three-plate type. The second to Nth projectors PJ2 to PJN in FIG. 2 can also have an image display unit having the same configuration as in FIG.

The image display unit 100 includes a light source 110, integrator lenses 112 and 114, a polarization conversion element 116, a superimposing lens 118, an R dichroic mirror 120R, a G dichroic mirror 120G, a reflection mirror 122, an R field lens 124R, and a G field lens. 124G, light modulation element 130, relay optical system 140, cross dichroic prism (light combining means in a broad sense) 160, and projection lens 170 (projection unit in a broad sense). In FIG. 4, since it is a three-plate type, as the light modulation element 130, an R liquid crystal panel 130R (first light modulation unit), a G liquid crystal panel 130G (second light modulation unit), and a B liquid crystal panel 130B ( A third light modulator is employed. The liquid crystal panels used as the R liquid crystal panel 130R, the G liquid crystal panel 130G, and the B liquid crystal panel 130B are transmissive liquid crystal display devices. The relay optical system 140 includes relay lenses 142, 144, and 146 and reflection mirrors 148 and 150.

The light source 110 is composed of, for example, an ultra-high pressure mercury lamp, and emits light including at least R component light, G component light, and B component light. The light source 110 is driven and controlled by a light source control signal from, for example, a luminance chromaticity adjustment unit 180 or a light source driving unit (not shown) in the first projector PJ1. The integrator lens 112 has a plurality of small lenses for dividing the light from the light source 110 into a plurality of partial lights. The integrator lens 114 has a plurality of small lenses corresponding to the plurality of small lenses of the integrator lens 112. The superimposing lens 118 superimposes the partial light emitted from the plurality of small lenses of the integrator lens 112.

The polarization conversion element 116 includes a polarization separation film and a λ / 2 plate, transmits p-polarized light, reflects s-polarized light, and converts p-polarized light to s-polarized light. The superimposing lens 118 is irradiated with the s-polarized light from the polarization conversion element 116.

The light superimposed by the superimposing lens 118 is incident on the R dichroic mirror 120R. The R dichroic mirror 120R has a function of reflecting R component light and transmitting G component and B component light. The light transmitted through the R dichroic mirror 120R is
The light irradiated to the G dichroic mirror 120G and reflected by the R dichroic mirror 120R is reflected by the reflection mirror 122 and guided to the R field lens 124R.

The dichroic mirror for G 120G has a function of reflecting G component light and transmitting B component light. The light transmitted through the dichroic mirror for G 120G is transmitted to the relay optical system 14
The light incident on 0 and reflected by the G dichroic mirror 120G is guided to the G field lens 124G.

In the relay optical system 140, in order to minimize the difference between the optical path length of the B component light transmitted through the G dichroic mirror 120G and the optical path length of the other R component and G component light, the relay lenses 142, 144, 146 is used to correct the difference in optical path length. Relay lens 14
2 is guided to the relay lens 144 by the reflection mirror 148. The light transmitted through the relay lens 144 is guided to the relay lens 146 by the reflection mirror 150. The light transmitted through the relay lens 146 is applied to the B liquid crystal panel 130B.

The light applied to the R field lens 124R is converted into parallel light and is incident on the R liquid crystal panel 130R. The R liquid crystal panel 130R functions as a light modulation element (light modulation unit), and the transmittance (passage rate, modulation rate) changes based on the R image signal. Therefore, the light (first color component light) incident on the R liquid crystal panel 130R is modulated based on the R image signal, and the modulated light is incident on the cross dichroic prism 160.

The light applied to the G field lens 124G is converted into parallel light and is incident on the G liquid crystal panel 130G. The G liquid crystal panel 130G functions as a light modulation element (light modulation unit), and the transmittance (passage rate, modulation rate) changes based on the G image signal. Therefore, the light (second color component light) incident on the G liquid crystal panel 130G is modulated based on the G image signal, and the modulated light is incident on the cross dichroic prism 160.

The B liquid crystal panel 130B irradiated with the light converted into parallel light by the relay lenses 142, 144, and 146 functions as a light modulation element (light modulation unit), and has a transmittance (passage rate) based on the B image signal. , Modulation rate) is changed. Therefore, the light (third color component light) incident on the B liquid crystal panel 130B is modulated based on the B image signal, and the modulated light is incident on the cross dichroic prism 160.

The modulation ratios of the R liquid crystal panel 130R, the G liquid crystal panel 130G, and the B liquid crystal panel 130B are controlled independently for each color component by the image signal adjusted by the luminance chromaticity adjustment unit 180.

The cross dichroic prism 160 as the light combining means is an R liquid crystal panel 130R.
, And a function of outputting combined light obtained by combining incident light from the G liquid crystal panel 130G and the B liquid crystal panel 130B as outgoing light. The projection lens 170 as a projection unit is a lens that enlarges and forms an output image on the screen SCR.

With the configuration as described above, the first projector PJ1 receives the adjustment parameter from the image adjustment apparatus 200 and adjusts the brightness and chromaticity of the entire screen of the first projection image IMG1 based on the adjustment parameter. Can do. Similarly, the second to Nth projectors PJ in FIG.
2 to PJN are the second to Nth projection images IMG2 to IMGN on the screen SCR, respectively.
And the brightness and chromaticity of the entire screen of each projected image can be adjusted.

Next, the image adjustment apparatus 200 that outputs adjustment parameters to the projector having the above configuration will be described.

As shown in FIG. 2, the image adjustment apparatus 200 includes an image data generation unit 210, a measurement data analysis unit 220 (an image information acquisition unit in a broad sense), and an image quality adjustment control unit 230.

The image data generation unit 210 generates image data corresponding to the content image, and outputs the image data to each of the first to Nth projectors PJ1 to PJN. The image data generation unit 210 may output the same image data to the first to Nth projectors PJ1 to PJN, or the images projected when the projected images are displayed side by side are connected. Such image data may be output to each projector. In addition, the image data generation unit 210 may output different image data to the first to Nth projectors PJ1 to PJN. Such a function of the image data generation unit 210 may be provided outside the image adjustment apparatus 200 or may be provided for each projector.

The measurement data analysis unit 220 analyzes the measurement result of the projected image measured by the image measurement unit 300 and performs correction (adjustment) that can be expressed quantitatively without depending on the difference in spectral characteristics of the image measurement unit 300 or the projector. A measurement value as a reference value is generated. Here, the image measuring unit 300
The measurement result of the projection image according to is image information corresponding to the chromaticity component at the measurement point in the projection image. Therefore, the measurement data analysis unit 220 generates a measurement value obtained by converting the measurement result obtained by the image measurement unit 300 into the color coordinates of a given color space. More specifically, the measurement data analysis unit 22
0 outputs the value of the CIE color system corresponding to the measurement result by the image measurement unit 300 as the measurement value. As a value of such a CIE color system, an XYZ color system (CIE 1931 color system)
Value, X ₁₀ Y ₁₀ Z ₁₀ color system (CIE 1964 color system) value, chromaticity coordinates (x, y) in the XYZ color system, chromaticity in the X ₁₀ Y ₁₀ Z ₁₀ color system Coordinates (x ₁₀ , y ₁₀ ), CIE
There are the brightness and color coordinates of the LAB color space (CIE 1976 L ^* a ^* b ^* color space), the brightness and color coordinates of the CIELV color space (CIE 1976 L ^* u ^* v ^* color space), and the like. Hereinafter, it is assumed that the measurement data analysis unit 220 outputs an XYZ color system value corresponding to the measurement result obtained by the image measurement unit 300.

  FIG. 5 shows a block diagram of a configuration example of the image quality adjustment control unit 230 of FIG.

The image quality adjustment control unit 230 includes an evaluation function processing unit 232, a gray axis adjustment unit 234, and an adjustment parameter calculation unit 236.

The evaluation function processing unit 232 obtains the value of the evaluation function of the color difference between the measurement points of the two adjacent projection images based on the measurement value from the measurement data analysis unit 220. Adjustment parameter calculation unit 236
Is such that the value of the evaluation function calculated by the evaluation function processing unit 232 is maximum or minimum.
Adjustment parameters for each projector are generated so as to adjust at least one image quality of the first to Nth projectors PJ1 to PJN. For example, the evaluation function processing units 232 are adjacent to each other.
When obtaining the value of the evaluation function of the color difference between the measurement points of two projection images, the adjustment parameter calculation unit 23
6 calculates an adjustment parameter for each projector for performing control to adjust at least one image quality of the plurality of projection images so that the value of the evaluation function of the color difference is maximized or minimized.

After the adjustment parameters for the first to Nth projectors PJ1 to PJN are once obtained, the gray axis adjustment unit 234 matches the gray axes of the projection images from the projectors in order to align the shades of the adjusted projection images. Adjust to The image quality adjustment control unit 230 outputs the adjustment parameters adjusted by the gray axis adjustment unit 234 so that the gray axes coincide with each other to each projector.

As described above, the image quality adjustment control unit 230 uses the measurement value from the measurement data analysis unit 220 to calculate the parameter corresponding to the function of the luminance / chromaticity adjustment unit of each projector, and controls the adjustment of the image by each projector. To do. For example, when the luminance / chromaticity adjustment unit of each projector can adjust each RGB color component, the image quality adjustment control unit 230 calculates an adjustment parameter for correcting the image signal for each RGB color component. For example, when the brightness and chromaticity adjustment unit of each projector can adjust the brightness and color difference, the image quality adjustment control unit 230 calculates adjustment parameters for correcting the brightness and color coordinates (LUV) of the CIELV color space. In the following, it is assumed that the image quality adjustment control unit 230 calculates adjustment parameters for correcting the brightness and color coordinates (LUV) of the CIELV color space.

The image adjustment apparatus 200 having the above-described configuration has the image quality of at least one of the first to Nth projection images including the two projection images so that the boundary between the two adjacent projection images is not conspicuous. Control to adjust. Hereinafter, the operation of the image adjustment apparatus 200 will be described by explaining a process of adjusting so that the boundary between two adjacent projection images is not conspicuous.

FIG. 6 shows a basic configuration of the multi-projector system 10 according to the first embodiment.
FIG. 6 schematically shows the multi-projector system 10 of FIG. 1, and the same parts as those in FIG.

The multi-projector system shown in FIG. 6 includes the image adjustment device 200 described above and first to fourth.
Projectors PJ1 to PJ4 and an image measuring unit 300 can be included.

Therefore, in the multi-projector system 10 of FIG. 6, the first projector PJ1 projects the first projection image IMG1, the second projector PJ2 projects the second projection image IMG2, and the third projector PJ3 3 projection images IMG3 are projected, and the fourth projector PJ4 projects the fourth projection image IMG4. And the camera as the image measurement part 300 measures the measurement point in each adjacent area | region of two adjacent projection images among the 1st-4th projection images IMG1-IMG4. As shown in FIG. 1, the first to fourth projection images IMG1 to IMG1
When the IMG 4 is displayed side by side, the camera as the image measurement unit 300 has the measurement points in the adjacent regions of the first and second projection images IMG1 and IMG2, the second and fourth projection images I, respectively.
Measurement points in the adjacent regions of the MG2 and IMG4, the first and third projection images IMG1, I
Measurement points in the adjacent regions of each MG3 are measured.

The image adjustment device 200 adjusts the brightness and chromaticity of the entire screen of at least one of the first to fourth projectors PJ1 to PJ4 based on the measurement result of the image measurement unit 300.

FIG. 7 shows a flowchart of a processing example of the image adjustment apparatus 200 of FIG. Image adjustment apparatus 2 in FIG.
00 has a central processing unit (CPU) and a memory (not shown), and functions of each unit of the image adjustment apparatus 200 are realized by a CPU that reads and executes a program stored in the memory. That is, a program for realizing the processing method shown in FIG. 7 is stored in a memory (not shown), and the CPU reads the program stored in the memory and executes a process corresponding to the program, so that FIG. The processing shown in FIG. 6 can be realized by software processing.

First, as an image information acquisition step, the image adjustment apparatus 200 uses the measurement data analysis unit 220 as an image information acquisition unit, and the measurement data from the image measurement unit 300 to measure each of the first and second projection images IMG1 and IMG2. Both measurement points in the adjacent region, second and fourth projection images IMG2, IMG4, both measurement points in the adjacent region, first and third projection images IM
Image information corresponding to chromaticity components at both measurement points in the adjacent regions of G1 and IMG3 is acquired (step S10).

FIG. 8 schematically shows examples of measurement points of the first to fourth projection images IMG1 to IMG4 in FIG. In FIG. 8, the image which looked at the 1st-4th projection images IMG1-IMG4 from the front is shown.

That is, in step S10, the function of the measurement data analysis unit 220 (image information acquisition unit) corresponds to the chromaticity component at the measurement point at the end of each of the two adjacent projection images among the plurality of projection images. Acquired image information. In FIG. 8, for the adjacent first and second projection images IMG1 and IMG2, the measurement points in the boundary region (adjacent region) adjacent to the second projection image IMG2 in the boundary region of the first projection image IMG1. P1b and the second projection image I
Image information corresponding to the chromaticity component at the measurement point P2b in the boundary region (adjacent region) adjacent to the first projection image IMG1 in the boundary region of MG2 is acquired.

Similarly, for the adjacent second and fourth projection images IMG2 and IMG4, the boundary region (adjacent region) adjacent to the fourth projection image IMG4 among the boundary regions of the second projection image IMG2.
Of the boundary between the measurement point P2a and the fourth projection image IMG4 in the second projection image IMG2
And image information corresponding to the chromaticity component at the measurement point P4a in the boundary region (adjacent region) adjacent to the image.

Further, for the adjacent third and fourth projection images IMG3 and IMG4, the measurement point P3b in the boundary region (adjacent region) adjacent to the fourth projection image IMG4 in the boundary region of the third projection image IMG3, Image information corresponding to the chromaticity component at the measurement point P4b in the boundary area (adjacent area) adjacent to the third projection image IMG3 in the boundary area of the fourth projection image IMG4 is acquired.

Furthermore, for the adjacent first and third projection images IMG1, IMG3, the measurement point P1a in the boundary region (adjacent region) adjacent to the third projection image IMG3 in the boundary region of the first projection image IMG1. And the first projection image IMG in the boundary region of the third projection image IMG3
Image information corresponding to the chromaticity component at the measurement point P3a in the boundary area (adjacent area) adjacent to 1 is acquired.

When acquiring the image information at the measurement point as shown in FIG. 8, the gradation values of the G component and the B component other than the R component are “0” in each of the first to fourth projectors PJ1 to PJ4. In a state where the image is displayed (T1 in FIG. 6), the image measurement unit 300 measures the eight measurement points in FIG. 8, and the measurement data analysis unit 220 determines the values XYZ color system values X _R , Y _R , out of Z _R value _{X R}
Is taken out (T2 in FIG. 6). Next, with each of the first to fourth projectors PJ1 to PJ4 displaying an image in which the gradation values of the R component and the B component other than the G component are “0” (T1 in FIG. 6), The image measurement unit 300 measures the eight measurement points in FIG.
At 0, the value Y _G is extracted from the values X _G , Y _G , Z _G of the XYZ color system (T2 in FIG. 6).
. Similarly, with each of the first to fourth projectors PJ1 to PJ4 displaying an image in which the gradation values of the R component and the G component other than the B component are “0” (T1 in FIG. 6), The image measurement unit 300 measures the eight measurement points in FIG. 8, and the measurement data analysis unit 220 extracts the value Z _B from the values X _B , Y _B , Z _B of the XYZ color system (T2 in FIG. 6). ). Such a process is called R
For every color component of GB, it repeats with some gradations among all gradations.

Subsequent to step S10 in FIG. 7, as an image quality adjustment control step, the image adjustment apparatus 200 uses the function of the image quality adjustment control unit 230 for each projector based on the evaluation function using the image information from the measurement data analysis unit 220. The adjustment parameter is calculated (step S12),
The calculated adjustment parameter is transmitted to each projector (T3 in FIG. 6) (step S14).
Then, the series of processing ends (end).

That is, in step S12, the image quality adjustment control unit 230 causes the first to fourth projectors P so that the evaluation function value of the color difference between the measurement points of the adjacent projection images becomes maximum or minimum.
Control is performed to adjust the luminance and chromaticity of at least one entire projection image of J1 to PJ4. The image quality adjustment control unit 230 performs control to adjust the image quality of each projection image by outputting adjustment parameters for each projector.

FIG. 9 is an explanatory diagram of the processing content of the adjustment parameter calculation unit 236 of the image quality adjustment control unit 230. Figure 9 represents an example of a state in which the measured values of the XYZ color system value X _R with respect to the input value of the R component of the image signal changes. The change in the measured value of the XYZ color system value Y _G with respect to the input value of the G component of the image signal and the change in the measured value of the value XYZ color system value Z _B with respect to the input value of the B component of the image signal are the same as in FIG. It is.
FIG. 10 is an explanatory diagram of specific processing contents in the adjustment parameter calculation unit 236.

The adjustment parameter calculation unit 236 of the image quality adjustment control unit 230 calculates an adjustment parameter optimal for adjustment of all projection images by repeatedly changing the adjustment parameters for adjusting the luminance and chromaticity of the two projection images.

In the following, the adjustment parameter calculation unit 236 performs the first and second projectors PJ1, PJ2.
It is assumed that the second projection image IMG2 by the first projector PJ1 is adjusted in order to perform control for adjusting the projection image of the first projector PJ1. Adjustment between the other two projected images can be performed in the same manner.

As shown in FIG. 9, the measurement values at the measurement points of the first and second projectors PJ1 and PJ2 may differ depending on the projector. Accordingly, the adjustment parameter calculation unit 236 inputs the R component input value Rin of the first projector PJ1 in which the input value Rin of the R component of the image signal matches the measurement value Xout of the second measurement point P2b of the second projector PJ2. 'Is calculated.
Then, the adjustment parameter calculation unit 236 obtains an adjustment parameter for correcting the input value Rin ′ so that the input value Rin ′ is output when the input value is Rin in the first projector PJ1, and uses the parameter as the first projector PJ1. Output to. Similarly, parameters for the G component and the B component are obtained and output to the first projector PJ1.

For example, this parameter is obtained by modifying the conversion equation shown in FIG.
The first projector PJ corresponding to the input value Gin of the n and G components and the input value Bin of the B component
1 and the lightness and color coordinates (L, U, V) of the CIELV color space of the first projection image IMG1
As required. Accordingly, the adjustment parameters for realizing the brightness and the color coordinates are the first parameters.
May be output to the projector PJ1.

In the above description, the parameter is transmitted only to the first projector PJ1, but in order to make the luminance and chromaticity of both measurement points coincide, the parameter is set to both the first and second projectors PJ1 and PJ2. May be transmitted.

As described above, after the image information at the measurement points in the boundary region is converted into the color coordinates of the given color space, the adjustment parameter calculation unit 236 calculates parameters for adjusting the brightness and chromaticity of the entire projection image. .

The first and second measurement points P1, P in the first and second projection images IMG1, IMG2
2 is preferably close to an end portion (boundary portion) in the projection image, but the present invention is not limited to the position of the measurement point in the projection image. What is necessary is just the position of the measurement point in the boundary area | region provided in a projection image.

Next, the processing example of step S12 in FIG. 7 for calculating the adjustment parameters of each projector will be described in detail.

FIG. 11 shows a flowchart of a detailed processing example of step S12 in FIG. In the image adjustment apparatus 200 of FIG. 6, a program for realizing the processing method shown in FIG. 11 is stored in a memory (not shown), and the CPU reads the program stored in the memory and performs processing corresponding to the program. By executing, the processing shown in FIG. 11 can be realized by software processing.

First, the adjustment parameter calculation unit 23 of the image quality adjustment control unit 230 in the image adjustment apparatus 200.
6 initializes a variable i (i is a natural number), for example, sets “1” to the variable i (step S).
20). Next, the adjustment parameter calculation unit 236 calculates the adjustment parameter based on the evaluation function of the measurement value at the i-th gradation among all the gradations that can be represented by the image signal (step S).
22).

Subsequently, the adjustment parameter calculation unit 236 increments the variable i (step S2
4).

Then, when the value of the variable i after increment is less than L (L is a natural number of 2 or more) (
In step S26: N), the image quality adjustment control unit 230 causes the adjustment parameter calculation unit 236 to return to step S22 and calculate an adjustment parameter in the next gradation. Here, L is the number of gradations to be adjusted. For example, L can be set to “5”. Thereby, the image quality adjustment control unit 230 of the image adjustment apparatus 200 sets at least one image quality of the plurality of images so that the value of the evaluation function of the measurement value is maximized or minimized at each gradation constituting the plurality of gradations. Control to adjust can be performed. By doing so, even when a plurality of types of projection images are displayed by each projector, it is possible to avoid a situation in which the image quality deteriorates due to the images.

In step S26, when the value of the variable i after the increment is larger than L (step S26: Y), the image adjustment apparatus 200 performs gray axis adjustment processing in the gray axis adjustment unit 234 (step S28), and a series of processes End (end).

Here, when the adjustment parameter for each gradation is calculated so that the value of the evaluation function for the color difference between the measurement points is maximized or minimized, the hue may be different for each gradation. So step S
In the 28 gray axis adjustment processing, the adjustment parameters are aligned so that the gray axes coincide with each other in the gradations constituting the plurality of gradations to be adjusted. As a result, it is possible to prevent deterioration in image quality due to different shades for each gradation by changing only the shade without changing the value of the evaluation function of the color difference between measurement points.

  Next, the processing example of step S22 in FIG. 11 will be described in detail.

FIG. 12 shows a flowchart of a detailed processing example of step S22 of FIG. In the image adjustment apparatus 200 of FIG. 6, a program for realizing the processing method shown in FIG. 12 is stored in a memory (not shown), and the CPU reads the program stored in the memory and performs processing corresponding to the program. By executing, the processing shown in FIG. 12 can be realized by software processing.

The image quality adjustment control unit 230 in the image adjustment apparatus 200 performs adjustment parameter calculation processing for each projector included in the image display system. At this time, the image quality adjustment control unit 230 performs the adjustment parameter calculation process for each projector recursively in order to obtain the optimum value of the process result of the adjustment parameter calculation process for each projector.

That is, the image quality adjustment control unit 230 includes the evaluation function processing unit 232 or the adjustment parameter calculation unit 23.
6, first, adjustment parameter calculation processing for the first projector PJ1 is performed (step S30). Next, the image quality adjustment control unit 230 performs an adjustment parameter calculation process for the second projector PJ2 in the evaluation function processing unit 232 or the adjustment parameter calculation unit 236 (step S32). Subsequently, the image quality adjustment control unit 230 performs an adjustment parameter calculation process for the third projector PJ3 in the evaluation function processing unit 232 or the adjustment parameter calculation unit 236 (step S34). Next, the image quality adjustment control unit 230 performs an adjustment parameter calculation process for the fourth projector PJ4 in the evaluation function processing unit 232 or the adjustment parameter calculation unit 236 (step S36). Step S30, Step S32,
Each adjustment parameter calculation process in step S34 and step S36 has the same processing contents except that the measurement points of the projection image to be adjusted are different.

Next, the adjustment parameter calculation unit 236 uses the adjustment parameters for each projector buffered in a buffer (not shown) as step S30, step S32, and step S34.
Then, the projector is updated with the adjustment parameters for each projector obtained in step S36 (step S3).
8). Then, the adjustment parameter calculation unit 236 detects a change in the stored value of the buffer updated in step S38, and whether or not the stored value of the buffer has changed before and after the update, or a change in the stored value before and after the update. It is determined whether or not the amount is within a given threshold (step S40).

In step S40, when it is detected that the stored value of the buffer has not changed before and after the update after the process of step S38, or it is determined that the amount of change in the stored value before and after the update is within a given threshold. When it is done (step S40: N), the adjustment parameter calculation unit 236
The adjustment parameters for each projector determined in step S30, step S32, step S34, and step S36 determine that the adjustment parameter for each projector determined at that time is the optimum value, and the series of processing ends. (End).

On the other hand, when it is detected in step S40 that the stored value of the buffer has changed before and after the update in step S38, or it is determined that the amount of change in the stored value before and after the update exceeds a given threshold value. When this is done (step S40: Y), the adjustment parameter calculation unit 236 uses the adjustment parameters for each projector obtained at step S30, step S32, step S34, and step S36 as the adjustment parameters for each projector obtained at that time. Is not the optimum value, the process returns to step S30, and again the first projector PJ1
Adjustment parameter calculation processing is performed.

In FIG. 12, the calculation process of the adjustment parameters is started in order from the first projector PJ1 when calculating the adjustment parameters of the first to fourth projectors PJ1 to PJ4. Is not limited to this, and the order of adjustment parameter calculation processing of the first to fourth projectors PJ1 to PJ4 may be any order.

Next, step S30, step S32, step S34, and step S36 in FIG. 12 will be described. As described above, the adjustment parameter calculation processing in step S30, step S32, step S34, and step S36 has the same processing content except that the measurement point of the projection image to be adjusted is different. A detailed processing example will be described.

FIG. 13 shows a flowchart of a detailed processing example of step S30 in FIG. In the image adjustment apparatus 200 of FIG. 6, a program for realizing the processing method shown in FIG. 13 is stored in a memory (not shown), and the CPU reads the program stored in the memory and performs processing corresponding to the program. By executing, the processing shown in FIG. 13 can be realized by software processing. Note that the memory (not shown) of the image adjustment apparatus 200 includes step S32 in FIG.
A program for realizing the processing method of steps S34 and S36 is stored.

First, the adjustment parameter calculation unit 23 in the image quality adjustment control unit 230 of the image adjustment apparatus 200.
6 performs a process of changing the value of the adjustment parameter for the first projector PJ1 (step S50). For example, as shown in FIG. 10, the adjustment parameters are the brightness and color coordinates (L, U, V) of the CIELV color space, and the adjustment parameter calculation unit 236 has the brightness and color coordinates (L, U, V, CIEUV color space). V) each parameter is set to “−1”, “0”,
Only one of “+1” is changed (for example, “−1”).

Subsequently, the adjustment parameter calculation unit 236 calculates the measurement values of the measurement points P1a and P1b in FIG. 8 after adjustment using the adjustment parameter after the change in step S50 (step S).
52).

Then, the evaluation function processing unit 234 uses the measurement value calculated in step S52, the color difference between the measurement points P1b and P2b of the first and second projection images IMG1 and IMG2, and the first and third projection images. The color difference between the measurement points P1a and P3a of IMG1 and IMG3 is obtained (step S54).

Thereafter, the brightness and color coordinates (L, U, V) parameters of the CIELV color space are changed by the next change from the current value (next among “−1”, “0”, “+1”). (For example, “+1”) (step S56: Y), the adjustment parameter calculation unit 236 returns to step S50. Thereby, a plurality of color differences after changing the brightness and color coordinates (L, U, V) parameters of the CIELV color space by “−1”, “0”, “+1” can be obtained (3 ³ types).

On the other hand, in step S56, the brightness and color coordinates (L, U, V) of the CIELV color space.
When the color difference after each of the parameters is changed by “−1”, “0”, and “+1” can be obtained (step S56: N), the adjustment parameter calculation unit 236 performs steps S50-step. It selects the minimum value from among all of the color difference calculated in S56 (3 ³ types), and determines a combination of the adjustment parameters that are outermost minimum value (step S58), and ends the series of processing (eND).

FIG. 14 is an explanatory diagram of measurement points in the process of FIG.
FIGS. 15A, 15B, and 15C are explanatory diagrams of the processing contents of FIG. FIG. 15A shows an explanatory diagram of the color difference between the measurement points in the color space before adjustment by the adjustment parameter. FIG. 15B shows an explanatory diagram of the color difference between the measurement points on the color space when the color difference between the measurement points is averaged as a comparative example of the present embodiment. FIG. 15C is an explanatory diagram of the color difference between the measurement points on the color space when the adjustment is performed so that the sum of the color differences between the measurement points is minimized in the present embodiment. 15A to 15C show the color difference between the measurement points, for example, La.
^{In the *} b ^* color space, this is schematically represented in a coordinate system in which the origin is the L axis, the x axis is the a ^* axis, and the y axis is the b ^* axis.

In FIG. 14, the first to fourth projection screens IMG1 to IMG1 projected onto the screen SCR of FIG.
Two measurement points in each projection image constituting MG4 are connected to each other, and the relationship between the measurement points in the same projection screen on the screen SCR is shown. When such color differences at the eight measurement points (four sets of measurement points) in FIG. 14 are schematically shown in the color space coordinate system shown in FIG. 15A, wavy lines out of straight lines connecting the measurement points. Corresponds to the color difference between the measurement points. Therefore, FIG.
In the color space coordinate system of A), for example, when the chromaticity components at each measurement point are integrated into one point, this means that the chromaticity components at each measurement point match, and the total of the wavy lines shown in FIG. When the length is the shortest, the sum of the color differences between the measurement points of the first to fourth projection images IMG1 to IMG4 is minimized.

Here, as a comparative example, when the color differences between measurement points are averaged, the result is as shown in FIG. 15B, and the total length of the wavy lines is not necessarily shortened. On the other hand, according to the present embodiment, as shown in FIG. 15C, the total length of the wavy lines is shorter than that in FIG.
The sum of the color differences between the measurement points of the first to fourth projection images IMG1 to IMG4 can be minimized. Therefore, as the evaluation function, a function for calculating the sum of the lengths of the wavy lines connecting the adjusted measurement points is selected, and by obtaining the minimum value of the sum, the color difference between the measurement points can be calculated with a very simple process. Each adjustment parameter can be determined so that the sum is minimized.

  Next, step S28 in FIG. 11 will be described.

FIG. 16 shows a flowchart of a detailed processing example of step S28 of FIG. In the image adjustment apparatus 200 of FIG. 6, a program for realizing the processing method shown in FIG. 16 is stored in a memory (not shown), and the CPU reads the program stored in the memory and performs processing corresponding to the program. By executing, the processing shown in FIG. 16 can be realized by software processing.
FIGS. 17A and 17B are explanatory diagrams of the processing contents of FIG. FIG.
FIG. 6 is an explanatory diagram of a color difference between measurement points on a color space in a given gradation. FIG. 17 (B)
An explanatory view of an average value of measured values for five gradations is shown. FIG. 17A shows an average value AVGi of measured values in the i-th gradation, for example, in the La ^* b ^* color space, the origin is the L axis, the x axis is the a ^* axis, and y
This is a schematic representation in a coordinate system with the axis b ^* axis. FIG. 17B shows an average value of measured values for five gradations, for example, in the La ^* b ^* color space, the origin is the L axis, the x axis is the a ^* axis, and the y axis is the b axis.
^{* This} is a schematic representation of the coordinate system used as the axis.

First, the gray axis adjustment unit 234 in the image quality adjustment control unit 230 of the image adjustment apparatus 200 is:
An average value AVGi of the measured values after adjustment at each gradation is calculated (step S60). The gray axis adjustment unit 234 averages the measurement values at a total of eight measurement points in the first to fourth projection images IMG1 to IMG4 as shown in FIG. As a result, the gray axis adjustment unit 234 calculates an average value AVGi indicated by an asterisk in FIG. 17A at the i-th gradation.

Next, the gray axis adjustment unit 234 calculates an average value AVG of the average values in all the gradations of the first to Lth gradations (for example, 5 gradations) (step S62). That is, as shown in FIG. 17B, the average values AVG1 to AVG5 (when L is 5) are calculated for each of the gradations constituting a plurality of gradations, so that the gray axis adjustment unit 234 performs each gradation. The average value of the obtained average value AVGi is obtained.

Then, the gray axis adjustment unit 234 adjusts the adjustment parameter of each gradation so that the average value AVGi of the measurement values becomes the average value AVG obtained in step S62 in each gradation (step S64), and a series of processes End (end). For example, the gray axis adjustment unit 234 can change the average value while maintaining the color difference relationship by translating the wavy line connecting the measurement points. By doing so, it is possible to avoid a situation in which the shade of gray changes depending on the brightness when the average value of the measurement values differs for each gradation.

In addition, although FIG. 16, FIG. 17 (A), and FIG. 17 (B) demonstrated as what calculates | requires the average value of a measured value, this embodiment is not limited to this. For example, the center of gravity of the measurement value may be obtained.

As described above, according to the processing described with reference to FIGS. 11 to 17A and 17B, the optimum value of the adjustment parameter for each projector can be calculated. Then, the adjustment parameters that have been obtained in this way are sent to the projectors at the same time,
The brightness and chromaticity of the entire screen of the projected image can be adjusted according to the adjustment parameter. Thus, according to the first embodiment, when there is uneven color in each of the images constituting the plurality of images, the plurality of images are arranged even if the color difference cannot be set to “0” at all the boundaries of the plurality of images. It becomes possible to suppress deterioration of the image quality of the arranged display image. In addition, by repeating the adjustment of the brightness and chromaticity of two adjacent projection images, the situation where the adjustment of the last projection image becomes impossible is avoided, and even in such a situation, the entire projection image is displayed as a whole. It is possible to suppress the deterioration of the image quality of the display images displayed side by side.

[Embodiment 2]
In the first embodiment, the adjustment parameter of each projector is calculated so that the color difference between the measurement points is minimized, but the present invention is not limited to this. Embodiment 2 according to the present invention
Then, the adjustment parameter of each projector is calculated so that the maximum value of the color difference between the measurement points is minimized.

Such an image display system, an image adjustment apparatus, and an image adjustment method in Embodiment 2 are as follows:
Although the detailed description is omitted because it is the same as in the first embodiment, the adjustment parameter processing unit 232 or the adjustment parameter calculation unit 236 in FIG. 5 adjusts the adjustment parameter so that the maximum value of the color difference is minimized during the processing in FIG. May be calculated. In this case, for example, the adjustment parameter is calculated so as to shorten the longest wavy line among the wavy lines connecting the measurement points in FIG.

According to the second embodiment described above, as in the first embodiment, it is possible to avoid a situation in which the adjustment of the last projected image becomes impossible by repeatedly adjusting the luminance and chromaticity of two adjacent projected images. Even in such a situation, it is possible to suppress the deterioration of the image quality of the display image in which all the projected images are displayed side by side as a whole.

[Embodiment 3]
In the first embodiment or the second embodiment, it has been described that the measurement point at the end in the adjacent region of each of the two adjacent images is one point, but the present invention is not limited to this. In Embodiment 3 according to the present invention, there are a plurality of measurement points at end portions in adjacent regions of two adjacent images, and an evaluation function between these measurement points (more specifically, an evaluation function of color difference) The adjustment parameter is calculated so that the value of) becomes the maximum or minimum.

FIG. 18 is an explanatory diagram of Embodiment 3 according to the present invention. In FIG. 18, the image which looked at the 1st-4th projection images IMG1-IMG4 from the front is shown. In FIG. 18, the same parts as those in FIG.

That is, by the function of the measurement data analysis unit 220 (image information acquisition unit), the color at each measurement point constituting the plurality of measurement points at the end of each of the two adjacent projection images among the plurality of projection images. Image information corresponding to the degree component is acquired. In FIG. 18, the first and second adjacent to each other.
For the projection images IMG1 and IMG2, the measurement points P1b1 and P1b2 in the boundary region (adjacent region) adjacent to the second projection image IMG2 in the boundary region of the first projection image IMG1
Image information corresponding to the chromaticity components at the measurement points P2b1, P2b2, and P2ab in the boundary region (adjacent region) adjacent to the first projection image IMG1 in the boundary region between P1ab and the second projection image IMG2 is acquired. The

Similarly, for the adjacent second and fourth projection images IMG2 and IMG4, the boundary region (adjacent region) adjacent to the fourth projection image IMG4 among the boundary regions of the second projection image IMG2.
Measurement points P2a1, P2a2, P2ab and measurement points P4a1, P4a2 in the boundary region (adjacent region) adjacent to the second projection image IMG2 among the boundary regions of the fourth projection image IMG4
, P4ab, image information corresponding to the chromaticity component is acquired.

Further, for the adjacent third and fourth projection images IMG3 and IMG4, the measurement points P3b1 in the boundary region (adjacent region) adjacent to the fourth projection image IMG4 in the boundary region of the third projection image IMG3, Measurement points P4b1, P4b2, P3b2, P3ab, and a boundary region (adjacent region) adjacent to the third projection image IMG3 among the boundary regions of the fourth projection image IMG4,
Image information corresponding to the chromaticity component in P4ab is acquired.

Furthermore, for the adjacent first and third projection images IMG1 and IMG3, the measurement point P1a1 in the boundary region (adjacent region) adjacent to the third projection image IMG3 in the boundary region of the first projection image IMG1. , P1a2, P1ab and measurement points P3a1, P3a in the boundary region (adjacent region) adjacent to the first projection image IMG1 among the boundary regions of the third projection image IMG3
2, image information corresponding to the chromaticity component in P3ab is acquired.

As the image quality adjustment control step, the image adjustment apparatus 200 includes an image quality adjustment control unit 23.
With the function 0, the adjustment parameter for each projector is calculated based on the evaluation function using the image information from the measurement data analysis unit 220, and the calculated adjustment parameter is transmitted to each projector.

That is, in the third embodiment, the image information acquisition unit acquires image information corresponding to chromaticity components at a plurality of measurement points at end portions in adjacent regions of two adjacent images among a plurality of images,
The image quality adjustment control unit includes at least a plurality of images such that the value of the evaluation function of the color difference between the plurality of measurement points is maximized or minimized based on the image information at the plurality of measurement points acquired by the image information acquisition unit. Control to adjust one image quality is performed.

In the third embodiment, as in the first or second embodiment, the adjustment parameter may be calculated so that the sum of the color differences between the measurement points is minimized, or the color difference among the color differences between the plurality of measurement points. The adjustment parameter may be calculated so that the maximum value of is minimized. According to the third embodiment as described above, it is possible to suppress deterioration in image quality of a display image in which a plurality of images are arranged side by side with higher accuracy than in the first or second embodiment.

In FIG. 18, when calculating the adjustment parameters of each projector, the measurement point P1ab
, At least one of the value of the evaluation function of the color difference between P4ab and the value of the evaluation function of the color difference between the measurement points P2ab and P3ab may be considered. By doing so, it is possible to adjust the image quality with higher accuracy.

[Embodiment 4]
In the first to third embodiments, the projector that configures the image display system has been described as an example of the configuration in which the projection images are displayed so as to be aligned in the vertical direction and the horizontal direction as illustrated in FIG. It is not limited to this. The image display system according to the fourth embodiment of the present invention may display a projection image arranged in at least one of the vertical direction and the horizontal direction.

FIG. 19 shows a configuration example of a multiple projector system as an image display system according to Embodiment 4 of the present invention. 19, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

A multi-projector system 400 according to the fourth embodiment includes first to Nth projectors PJ1 to PJN, an image adjustment device 200, and an image measurement unit 300. The first to Nth projectors PJ1 to PJN project images onto the screen SCR and display the first to Nth projection images IMG1 to IMGN. And an image is displayed by arranging and displaying the projection image on screen SCR by each projector which constitutes the 1st-Nth projectors PJ1-PJN adjacent to each other.

The projection images constituting the first to Nth projection images IMG1 to IMGN may be displayed so that the adjacent image and the boundary portion thereof are in contact with each other, or are displayed at a given interval from the adjacent image. May be. In FIG. 19, the first to Nth projection images IMG1 to IMGN are displayed in the horizontal direction (
Although an example is shown in which only the horizontal and horizontal directions are displayed, the first to Nth projection images IMG1 to IMGN may be displayed only in the vertical direction.

The first to Nth projectors PJ1 to PJN may have the same configuration.
Different configurations may be used. However, each projector constituting the first to Nth projectors PJ1 to PJN has a function of adjusting the luminance and chromaticity of the entire screen.

Similar to any one of the first to third embodiments, the image adjustment apparatus 200 is the first one.
First to Nth projected images IMG1 projected by Nth projectors PJ1 to PJN
Adjust the brightness and chromaticity of the image of IMGN. Therefore, the image adjustment apparatus 200 calculates adjustment parameters for adjusting the luminance and chromaticity of the image, and the first to Nth projectors PJ1 to PJ1 to PJ.
The adjustment parameter can be transmitted to at least one of the JNs. The projector that has received the adjustment parameter adjusts the brightness and chromaticity of the entire screen based on the adjustment parameter.

In the multi-projector system 400 as described above, in the image adjustment apparatus 200,
The image information corresponding to the chromaticity component at the measurement point (measurement pixel) in the adjacent region (boundary region) of each of the two adjacent projection images is acquired, and the value of the evaluation function of the color difference between the measurement points is maximum or minimum Thus, control for adjusting at least one of the first to Nth projectors PJ1 to PJN is performed. By doing so, it is possible to suppress deterioration in image quality of a display image in which a plurality of images are arranged side by side. Furthermore, the projection image of each projector has uneven color, and compared with the case where the image quality is adjusted for every two adjacent projection images, the color difference between the plurality of projection images can be made smaller, and the display image of the plurality of projection images can be reduced. A reduction in image quality can be suppressed.

Each part constituting the multi-projector system 400 in the fourth embodiment is the same as that in the first embodiment.
Detailed description will be omitted.

FIG. 20 is an explanatory diagram when N is 2 in the fourth embodiment. In FIG. 20, the image which looked at 1st and 2nd projection image IMG1, IMG2 from the front is shown.

In the fourth embodiment, when N is 2, the function of the measurement data analysis unit 220 (image information acquisition unit) is used to measure the measurement points at the end portions in the boundary regions of two adjacent projection images among the plurality of projection images. Image information corresponding to the chromaticity component is acquired. In FIG. 20, for the adjacent first and second projection images IMG1 and IMG2, the measurement points in the boundary region (adjacent region) adjacent to the second projection image IMG2 in the boundary region of the first projection image IMG1. P1b1, P1b
2 and image information corresponding to the chromaticity components at the measurement points P2b1 and P2b2 in the boundary region (adjacent region) adjacent to the first projection image IMG1 among the boundary regions of the second projection image IMG2.

As the image quality adjustment control step, the image adjustment apparatus 200 includes an image quality adjustment control unit 23.
With the function 0, the adjustment parameter for each projector is calculated based on the evaluation function using the image information from the measurement data analysis unit 220, and the calculated adjustment parameter is transmitted to each projector.

That is, in the fourth embodiment, when N is 2, the value of the evaluation function of the color difference between the measurement points is maximized or minimized by using the measurement values at a plurality of measurement points in the adjacent region of the two adjacent projection images. The adjustment parameters of each projector can be calculated so that

According to the fourth embodiment described above, as in the first embodiment, the situation in which the adjustment of the last projected image cannot be made by repeating the adjustment of the luminance and chromaticity of two adjacent projected images is avoided. Even in such a situation, it is possible to suppress the deterioration of the image quality of the display image in which all the projected images are displayed side by side as a whole.

As described above, the image adjustment device, the image display system, and the image adjustment method according to the present invention have been described based on the above-described embodiments or modifications thereof, but the present invention is limited to the above-described embodiments or modifications thereof. However, the present invention can be implemented in various modes without departing from the gist thereof, and for example, the following modifications are possible.

(1) In each of the above-described embodiments, the image adjustment device according to the present invention is provided outside the projector. However, the image adjustment device according to the present invention is provided in any one of the plurality of projectors constituting the multi-projector system. A function may be built in.

(2) In each of the above embodiments, the projector has been described as an example, but the present invention is not limited to this. For example, an image display device to be adjusted by the image adjustment device according to the present invention includes, for example, a CRT (Cathode Ray Tube) device, a liquid crystal display device, and an LED (Light Emitting).
Device) The present invention can be applied to all devices that perform image display, such as display devices, plasma display devices, and organic EL display devices.

(3) In each of the above embodiments, the light valve is used as the light modulation element (light modulation unit). However, the present invention is not limited to this. Light modulator (light modulator)
For example, DLP (Digital Light Processing) (registered trademark), LCOS (Liquid Cr
ystal On Silicon) may be employed.

(4) In the above embodiments, the present invention has been described as an image adjustment apparatus, an image display system, and an image adjustment method. However, the present invention is not limited to this. For example, it may be a program in which a processing procedure of an image adjustment method for realizing the present invention is described, or a recording medium on which the program is recorded.

1 is a diagram illustrating a configuration example of a multi-projector system in Embodiment 1. FIG. 1 is a block diagram of a configuration example of a multi-projector system in Embodiment 1. FIG. The block diagram of the structural example of the brightness | luminance chromaticity adjustment part of FIG. The figure which shows the structural example of the image display part of FIG. FIG. 3 is a block diagram of a configuration example of an image quality adjustment control unit in FIG. 2. 1 is a diagram illustrating a basic configuration of a multi-projector system according to a first embodiment. FIG. 7 is a flowchart of a processing example of the image adjustment apparatus in FIG. 6. The figure which shows typically the example of the measurement point of the 1st-4th projection image of FIG. Explanatory drawing of the processing content of the adjustment parameter calculation part of an image quality adjustment control part. Explanatory drawing of the specific processing content in an adjustment parameter calculation part. FIG. 8 is a flowchart of a detailed processing example of step S12 in FIG. FIG. 12 is a flowchart of a detailed processing example of step S22 in FIG. FIG. 13 is a flowchart of a detailed processing example of step S30 in FIG. Explanatory drawing of the measurement point in the process of FIG. FIGS. 15A, 15B, and 15C are explanatory diagrams of the processing contents of FIG. FIG. 12 is a flowchart of a detailed processing example of step S28 in FIG. 17A and 17B are explanatory diagrams of the processing contents of FIG. Explanatory drawing of Embodiment 3. FIG. The figure which shows the structural example of the multiple projector system in Embodiment 4. FIG. Explanatory drawing in case N is 2 in Embodiment 4. FIG.

Explanation of symbols

10, 400 ... multi-projector system, 100 ... image display unit, 110 ... light source,
112, 114 ... integrator lens, 116 ... polarization conversion element,
118 ... Superimposing lens, 120R ... R dichroic mirror,
120G ... Dichroic mirror for G, 122,148,150 ... Reflective mirror,
124R ... R field lens, 124G ... G field lens,
130R ... R liquid crystal panel, 130G ... G liquid crystal panel,
130B ... Liquid crystal panel for B, 140 ... Relay optical system,
142, 144, 146 ... relay lens, 160 ... cross dichroic prism,
170 ... projection lens, 180 ... luminance chromaticity adjustment unit, 182 ... adjustment parameter storage unit,
184 ... Signal conversion unit, 190 ... Image data input unit, 200 ... Image adjustment device,
210: Image data generation unit, 220: Measurement data analysis unit, 230: Image quality adjustment control unit,
232 ... evaluation function processing unit, 234 ... gray axis adjustment unit,
236 ... adjustment parameter calculation unit, 300 ... image measurement unit,
IMG1 to IMGN ... 1st to Nth projection images,
PJ1 to PJN ... 1st to Nth projectors, SCR ... screen

Claims (8)

An image adjustment device for adjusting a display image in which a plurality of images are arranged side by side,
An image information acquisition unit that acquires image information corresponding to a chromaticity component at a measurement point at an end in an adjacent region of each of two adjacent images among the plurality of images;
Based on the image information acquired by the image information acquisition unit, control is performed to adjust at least one image quality of the plurality of images so that the value of the evaluation function of the color difference between the measurement points is maximized or minimized. And an image quality adjustment control unit. In claim 1,
The image quality adjustment control unit
An image in which control is performed to adjust at least one image quality of the plurality of images so that a total sum of color differences between the measurement points obtained for every two adjacent images among the plurality of images is minimized. Adjustment device. In claim 1,
The image quality adjustment control unit
An image adjustment apparatus that performs control to adjust at least one image quality of the plurality of images so that a maximum value of a color difference between the measurement points is minimized. In any one of Claims 1 thru | or 3,
The image quality adjustment control unit
An image adjustment apparatus that performs control to adjust at least one image quality of the plurality of images so that the value of the evaluation function is maximized or minimized at each gradation constituting the plurality of gradations. In claim 4,
An image adjustment apparatus that performs control to adjust at least one image quality of the plurality of images so that gray axes in the respective gradations constituting the plurality of gradations coincide with each other. In any one of Claims 1 thru | or 5,
The image information acquisition unit
Obtaining image information corresponding to chromaticity components at a plurality of measurement points at an end in an adjacent region of each of two adjacent images among the plurality of images;
The image quality adjustment control unit
An image adjustment apparatus that performs control to adjust at least one image quality of the plurality of images based on the image information at the plurality of measurement points acquired by the image information acquisition unit. A plurality of image display devices for displaying a plurality of images constituting the display image;
An image adjustment device according to any one of claims 1 to 6,
The image adjustment device includes:
An image display system for adjusting at least one image quality of the plurality of images. An image adjustment method for adjusting a display image in which a plurality of images are arranged side by side,
An image information acquisition step of acquiring image information corresponding to a chromaticity component at an end measurement point in an adjacent area of each of two adjacent images among the plurality of images;
Based on the image information acquired in the image information acquisition step, control is performed to adjust at least one image quality of the plurality of images so that the value of the evaluation function of the color difference between the measurement points is maximized or minimized. And an image quality adjustment control step.

Images