JP2009159371A - Device and method for adjusting image, and image display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image adjusting device or the like for preventing the boundary between adjacent projected images from being highlighted, when adjacently displaying projection images of a plurality of projectors. <P>SOLUTION: The image adjusting device 200 for adjusting an image in which first and second projection images are displayed adjacently includes: an image information acquisition section for acquiring image information at a first measurement point in a boundary region closest to a second projection image in a plurality of boundary regions in a first projection image including the boundary section of the first projection image, and image information at a second measurement point in a boundary region closest to the first projection image in a plurality of boundary regions in the second projection image including the boundary section of the second projection image; and an image quality adjustment control section for performing control to adjust luminance and chromaticity in the entire first projection image so that luminance and chromaticity at the first measurement point coincide with those at the second one, based on image information at the first and second. measurement points. <P>COPYRIGHT: (C)2009,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.

  A multi-projector system using a plurality of projectors as projection-type image display devices displays a large screen image by bringing the projection images of the projectors next to each other, or displays different images on each projection image at a time. It is often used as an image display system that can display a large amount of information. Like the projector system, this multi-projector system is highly demanded to improve the image quality of the displayed image, and the image quality can be improved by adjusting the individual performance variations of the projectors that make up the system. Yes.

  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. In this case, when an image is displayed by a plurality of adjacent projection images, the boundary between the projection images is noticeable and the image quality is deteriorated. Therefore, in Patent Document 1, it is necessary to correct luminance unevenness and color unevenness in one screen for each of adjacent projection images, and there is a problem that processing and configuration become complicated.

  The present invention has been made in view of the technical problems as described above, and one of the purposes thereof is a boundary between adjacent projection images when the projection images of a plurality of projectors are displayed adjacent to each other. Adjustment apparatus capable of making the image inconspicuous with a simple configuration, an image display system including the image adjustment apparatus, and an image adjustment method.

  In order to solve the above problems, the present invention adjusts an image displayed so that the first projection image projected by the first projector and the second projection image projected by the second projector are adjacent to each other. An image adjustment device for performing first measurement in a boundary region closest to the second projection image among a plurality of boundary regions in the first projection image including a boundary portion of the first projection image An image at a second measurement point in a boundary region closest to the first projection image among a plurality of boundary regions in the second projection image including image information at the point and a boundary portion of the second projection image Based on the image information acquisition unit for acquiring information and the image information at the first and second measurement points, the luminance and chromaticity at the first measurement point are the luminance and chromaticity at the second measurement point, and The first projection image so as to match Relating to image adjustment device including an image quality adjustment control unit that performs control to adjust the overall brightness and chromaticity.

  According to the present invention, since the brightness and chromaticity of the measurement points in the boundary region between two adjacent projection images are corrected to coincide with each other, the boundary portion between the two projection images becomes inconspicuous with a simple configuration and processing. It is possible to prevent deterioration of the image quality of an image in which two projected images are displayed side by side.

  In the image adjustment apparatus according to the present invention, the image quality adjustment control unit adjusts the luminance and chromaticity of the entire projected image after converting the image information at the measurement points in the boundary region into the color coordinates of a given color space. Can be controlled.

  According to the present invention, the brightness and chromaticity of the two projection images are adjusted based on the image information that is defined and can be expressed quantitatively. It becomes possible to make the boundary part of two projection images inconspicuous with high accuracy without depending on the difference between the two.

  In the image adjustment device according to the present invention, when two projection images have an overlap area, the measurement points in each boundary area may be provided in an area excluding the overlap area.

  According to the present invention, even when there is an overlap region between two adjacent projection images, the boundary between projection images can be adjusted with high accuracy so as not to stand out.

  In the image adjustment device according to the present invention, when adjusting an image displayed so that the second projection image and the third projection image projected by the third projector are adjacent to each other, the image information acquisition unit Is the image information at the third measurement point in the boundary region closest to the third projection image among the plurality of boundary regions in the second projection image including the boundary portion of the second projection image, and Obtaining image information at a fourth measurement point in a boundary region closest to the second projection image among a plurality of boundary regions in the third projection image including a boundary portion of the third projection image; The image quality adjustment control unit, based on the image information at the third and fourth measurement points, so that the luminance and chromaticity at the fourth measurement point coincide with the luminance and chromaticity at the third measurement point. Luminance and chromaticity of the entire third projected image It can be controlled to adjust.

  According to the present invention, even when three or more projected images are displayed side by side, the correction is sequentially repeated so that the luminance and chromaticity of the measurement points in the boundary area between two adjacent projected images match. Therefore, with a simple configuration and processing, each boundary portion of images in which three or more projection images are displayed side by side becomes inconspicuous, and deterioration in image quality of the images can be prevented.

  According to another aspect of the invention, there is provided the image adjustment device according to any one of the above, the first projector, the second projector, and an image measurement unit that measures image information at the first and second measurement points. Concerning image display system including.

  According to the present invention, it is possible to provide an image display system capable of making a boundary between adjacent projection images inconspicuous with a simple configuration when the projection images of two projectors are displayed adjacent to each other. Become.

  In addition, the present invention provides the image adjustment device described above, the first projector, the second projector, the third projector, the image information at the first and second measurement points, and the third projector. And an image display system including an image measurement unit that measures image information at a fourth measurement point.

  ADVANTAGE OF THE INVENTION According to this invention, when displaying the projection image of three or more projectors so that it may adjoin, it can provide the image display system which can make the boundary of an adjacent projection image inconspicuous with a simple structure. become.

  In addition, the present invention is an image adjustment method for adjusting an image displayed so that a first projection image projected by a first projector and a second projection image projected by a second projector are adjacent to each other. The image information at the first measurement point in the boundary region closest to the second projection image among the plurality of boundary regions in the first projection image including the boundary portion of the first projection image, and the Image information for acquiring image information at a second measurement point in a boundary region closest to the first projection image among a plurality of boundary regions in the second projection image including a boundary portion of the second projection image Based on the obtaining step and the image information at the first and second measurement points, the brightness and chromaticity at the first measurement point are matched with the brightness and chromaticity at the second measurement point. The brightness of the entire projected image It relates to an image adjustment method and a picture quality adjustment control step of performing control for adjusting the chromaticity.

  According to the present invention, it is possible to provide an image adjustment method capable of making a boundary between adjacent projection images inconspicuous with a simple configuration when the projection images of two projectors are displayed adjacent to each other. Become.

  Further, in the image adjustment method according to the present invention, when adjusting an image displayed so that the second projection image and the third projection image projected by the third projector are adjacent to each other, the second projection Image information at the third measurement point in the boundary region closest to the third projection image among the plurality of boundary regions in the second projection image including the boundary portion of the image and the boundary of the third projection image Acquiring image information at a fourth measurement point in a boundary region closest to the second projection image among a plurality of boundary regions in the third projection image including a part; and the third and fourth Based on the image information at the measurement point, the brightness and chromaticity of the entire third projected image so that the brightness and chromaticity at the fourth measurement point coincide with the brightness and chromaticity at the third measurement point. To perform control to adjust the Mukoto can.

  ADVANTAGE OF THE INVENTION According to this invention, when displaying the projection image of three or more projectors so that it may adjoin, it can provide the image adjustment method which can make the boundary of an adjacent projection image inconspicuous with a simple structure. become.

  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.

Embodiment 1
As shown below, an image display system according to the present invention is a multi-projector system that uses a plurality of projectors as projection-type image display devices and displays images by bringing projected images onto a screen adjacent to each other. .

  FIG. 1 shows a configuration example of a multi-projector system according to the first embodiment of the present invention.

  The multi-projector system 10 according to the first embodiment includes first to Nth (N is an integer of 2 or more) 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 displaying so that the projection image on screen SCR by each projector which constitutes the 1st-Nth projectors PJ1-PJN may be adjacent.

  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. 1 shows an example in which the first to Nth projection images IMG1 to IMGN are displayed side by side in the horizontal direction (lateral direction, left and right direction), but the vertical direction (vertical direction, vertical direction). ) Or in an oblique direction. The first to Nth projectors PJ1 to PJN may have the same configuration, but may have different configurations. 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.

  The image adjustment apparatus 200 adjusts the brightness and chromaticity of the images of the first to Nth projection images IMG1 to IMGN projected by the first to Nth projectors PJ1 to PJN. Therefore, the image adjustment apparatus 200 can calculate parameters for adjusting the brightness and chromaticity of the image and transmit the parameters to at least one of the first to Nth projectors PJ1 to PJN. The projector that has received the parameter adjusts the brightness and chromaticity of the entire screen based on the parameter. Such an image adjustment apparatus 200 calculates a parameter using the measurement result of the projection image by the image measurement unit 300.

  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.

  In the multi-projector system 10 as described above, the image adjustment device 200 acquires image information of measurement points (measurement pixels) in the boundary region between two adjacent projection images, and performs two measurements based on the image information. The brightness and chromaticity of the entire projection image by at least one projector are adjusted so that the brightness and chromaticity at the point match. By doing so, the boundary between two projection images in the multi-projector system can be made inconspicuous with a simple configuration and without performing complicated processing. That is, it becomes possible to make the boundary between projection images inconspicuous when a plurality of projection images are displayed next to each other without necessarily performing luminance unevenness / color unevenness correction processing in one projection screen.

  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, the same parts as those in FIG. In FIG. 2, description will be made assuming that the configurations of the first to Nth projectors PJ1 to PJN are the same, 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 parameters 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 a parameter storage unit 182 and a signal conversion unit 184. The parameter storage unit 182 stores parameters from the image adjustment device 200. The signal conversion unit 184 corrects the image signal from the image data input unit 190 based on the parameters stored in the parameter storage unit 182, and outputs the corrected image signal to the image display unit 100.

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

  FIG. 4 shows a configuration example of the image display unit 100 of FIG. In FIG. 4, the image display unit 100 of the first projector PJ1 shows a so-called three-plate configuration example, but the image display unit according to the present invention is not limited to the so-called three-plate type. The second to Nth projectors PJ2 to PJN in FIG. 1 or 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 applied to the G dichroic mirror 120G, and the light 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 G dichroic mirror 120G enters the relay optical system 140, and the light 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. The light transmitted through the relay lens 142 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 a light combining unit has a function of outputting combined light obtained by combining incident light from the R liquid crystal panel 130R, 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 can receive the parameter from the image adjustment apparatus 200 and adjust the brightness and chromaticity of the entire screen of the first projection image IMG1 based on the parameter. .

  As shown in FIG. 2, the image adjustment apparatus 200 that outputs parameters to the projector having the above configuration includes an image data generation unit 210, a measurement data analysis unit 220 (image information acquisition unit in a broad sense), image quality adjustment control. Section (parameter calculation section) 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. 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 220 outputs a CIE color system value corresponding to the measurement result by the image measurement unit 300 as a measurement value. Such values of the CIE color system include the values of the XYZ color system (CIE 1931 color system), the values of the X ₁₀ Y ₁₀ Z ₁₀ color system (CIE 1964 color system), and the XYZ color system. Chromaticity coordinates (x, y), chromaticity coordinates (x ₁₀ , y ₁₀ ) in the X ₁₀ Y ₁₀ Z ₁₀ color system, brightness of CIELAB color space (CIE 1976 L ^* a ^* b ^* color space) There are color coordinates, brightness, color coordinates, etc. of the CIELV color space (CIE 1976 L ^* u ^* v ^* color space). 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.

  The image quality adjustment control unit (parameter calculation unit) 230 uses the measurement value from the measurement data analysis unit 220 to calculate a parameter corresponding to the function of the luminance / chromaticity adjustment unit of each projector, and to calculate the luminance and chromaticity of each projector. Control to adjust. For example, when the luminance and chromaticity adjustment unit of each projector can adjust for each color component of RGB, the image quality adjustment control unit 230 calculates a parameter for correcting the image signal for each color component of RGB. 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 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 parameters for correcting the lightness and color coordinates (LUV) of the CIELV color space.

  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.

  The image adjustment apparatus 200 having the above configuration adjusts the luminance and chromaticity of at least one of the two projection images so that the boundary between the two projection images adjacent to each other is not conspicuous. 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. 5 shows a basic configuration of the multi-projector system 10 according to the first embodiment. FIG. 5 schematically shows an example in which the multi-projector system 10 of FIG. 1 is configured with two projectors. The same parts as those in FIG.

  The multi-projector system shown in FIG. 5 can include the image adjustment device 200, the first projector PJ1, the second projector PJ2, and the image measurement unit 300.

  Therefore, in the multi-projector system 10 of FIG. 5, the first projector PJ1 projects the first projection image IMG1, and the second projector PJ2 projects the second projection image IMG2. Then, the camera as the image measurement unit 300 measures the first and second projection images IMG1 and IMG2, and the image adjustment device 200 uses the first and second projectors PJ1 based on the measurement result of the image measurement unit 300. , PJ2 adjusts the brightness and chromaticity of the entire screen of at least one of the projected images.

  FIG. 6 shows a flowchart of a processing example of the image adjustment apparatus 200 of FIG. The image adjustment apparatus 200 of FIG. 5 has a central processing unit (CPU) and a memory (not shown), and functions of each part of the image adjustment apparatus 200 by a CPU that reads and executes a program stored in the memory. Is realized. That is, a program for realizing the processing method shown in FIG. 6 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. The processing shown in FIG. 6 can be realized by software processing.

  First, as the image information acquisition step, the image adjustment apparatus 200 performs measurement on the first and second projection images IMG1 and IMG2 based on the measurement data from the image measurement unit 300 by the measurement data analysis unit 220 as the image information acquisition unit. Image information of the points P1 and P2 is acquired (step S10).

  FIG. 7 shows an example of the measurement points P1 and P2 of the first and second projection images IMG1 and IMG2 in FIG. FIG. 7 shows an example in which the first and second projection images IMG1 and IMG2 are viewed from the front.

  That is, in step S10, a plurality of boundary areas AR10 in the first projection image IMG1 including the boundary portions ED10 to ED13 of the first projection image IMG1 are obtained by the function of the measurement data analysis unit 220 (image information acquisition unit). In the second projection image IMG2 including the image information at the first measurement point P1 in the boundary region AR10 closest to the second projection image IMG2 in the AR13 and the boundary portions ED20 to ED23 of the second projection image IMG2. Image information at the second measurement point P2 in the boundary region AR20 closest to the first projection image IMG1 is acquired from the plurality of boundary regions AR20 to AR23.

More specifically, the first and second projectors PJ1 and PJ2 display the first and second projectors PJ1 and PJ2 with an image in which the gradation values of the G component and the B component other than the R component are 0 (T1 in FIG. 5). and a second measurement points P1, P2 is measured, taken in the measurement data analysis unit 220, XYZ color system value _{X R,} Y R, the value among _{X R} of _{Z R} (T2 in FIG. 5). Next, the first and second projectors PJ1 and PJ2 display the images in which the gradation values of the R component and the B component other than the G component are 0 (T1 in FIG. 5). measurement points P1, P2 is measured, taken in the measurement data analysis unit 220, XYZ color system value _{X G,} Y G, the value among _{Y G} of _{Z G} (T2 in FIG. 5). Similarly, the first and second projectors PJ1 and PJ2 display the first and second projectors PJ1 and PJ2 in the state in which the R component and G component gradation values other than the B component are displayed (T1 in FIG. 5). and the measured measurement points P1, P2, in the measurement data analysis unit 220, XYZ color system value _{X B,} Y _B, taken out of which value _{Z B} of _{Z B} (T2 in FIG. 5). Such processing is repeated for some of the gradations for every RGB color component.

  Following step S10 in FIG. 6, as an image quality adjustment control step, the image adjustment apparatus 200 calculates parameters using the image information from the measurement data analysis unit 220 by the function of the image quality adjustment control unit 230 (step S12). ), The calculated parameters are transmitted to each projector (T3 in FIG. 5) (step S14), and a series of processing ends (end).

  That is, in step S12, the image quality adjustment control unit 230 determines that the luminance and chromaticity at the first measurement point P1 at the second measurement point P2 are based on the image information at the first and second measurement points P1 and P2. By calculating the parameters so as to match the luminance and chromaticity, control is performed to adjust the luminance and chromaticity of the entire first projection image IMG1.

FIG. 8 is an explanatory diagram of processing contents of the image quality adjustment control unit 230. Figure 8 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. Measurements and the XYZ color system value Y _G with respect to the input value of the G component of the image signal, also changes in the measured value of the value Z _B of the XYZ colorimetric system with respect to the input value of the B component of the image signal, similar to FIG. 8 It is.
FIG. 9 is an explanatory diagram of specific processing contents in the image quality adjustment control unit 230.

  As shown in FIG. 8, the measurement values at the measurement points of the first and second projectors PJ1 and PJ2 may differ depending on the projector. Therefore, the image quality adjustment control unit 230 receives the R component input value Rin of the first projector PJ1 in which the R component input value Rin of the image signal matches the measurement value Xout of the second measurement point P2 of the second projector PJ2. 'Is calculated. Then, the image quality adjustment control unit 230 obtains a parameter for correcting the first projector PJ1 to output the input value Rin ′ when the input value is Rin, and sends the parameter to the first projector PJ1. Output. Similarly, parameters for the G component and the B component are obtained and output to the first projector PJ1.

  This parameter is obtained by modifying the conversion equation shown in FIG. 9, for example, so that the first projector PJ1 corresponds to the R component input value Rin, the G component input value Gin, and the B component input value Bin. It is obtained as the brightness and color coordinates (L, U, V) of the CIELV color space of the projection image IMG1. Accordingly, the correction parameters for realizing the brightness and the color coordinates may be output to the first 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 converting the image information at the measurement points in the boundary region into the color coordinates of the given color space, the image quality adjustment control unit 230 calculates parameters for adjusting the brightness and chromaticity of the entire projected image. .

  Note that the first and second measurement points P1 and P2 in the first and second projection images IMG1 and IMG2 are preferably close to the boundary in the projection image, respectively, and the present invention can measure the measurement in the projection image. The position of the point is not limited. What is necessary is just the position of the measurement point in the boundary area | region provided in a projection image.

  FIG. 10 schematically shows another example of the boundary region in the first embodiment. 10, parts that are the same as those in FIG. 7 are given the same reference numerals, and descriptions thereof will be omitted as appropriate.

  In FIG. 10, the projection image is divided into nine blocks of rectangular regions with one block as the central region, and three blocks adjacent to the adjacent projection images are defined as boundary regions where measurement points are provided. That is, in FIG. 10, the first measurement point P1 is provided in an area having three blocks including the boundary portion ED10 of the first projection image IMG1 as a boundary region, and includes the boundary portion ED20 of the second projection image IMG2. A second measurement point P2 is provided in an area having 3 blocks as a boundary area.

  FIG. 11 schematically shows still another example of the boundary region in the first embodiment. In FIG. 11, the same parts as those in FIG.

  In FIG. 11, the boundary region is divided and provided for each boundary portion where the pixels in the projection image are closest. That is, in FIG. 11, the region where the pixel closest to the boundary portion ED10 of the first projection image IMG1 exists is a region having a shape of a right isosceles triangle having the boundary portion ED10 as a hypotenuse. Similarly, the region where the pixel closest to the boundary portion ED20 of the second projection image IMG2 exists is a region having a shape of a right isosceles triangle having the boundary portion ED20 as a hypotenuse. The first and second measurement points P1 and P2 are provided in a boundary region having a shape of a right isosceles triangle having the boundary portions ED10 and ED20 as hypotenuses, respectively.

  In the above embodiment, the description has been made on the assumption that two adjacent projection images are not displayed in an overlapping manner. However, the present invention is not limited to this, and two adjacent projection images are overlapping. May be displayed.

  FIG. 12 schematically shows an example of the positions of the first and second measurement points P1 and P2 when two adjacent projection images are displayed in an overlapping manner. 12, parts similar to those in FIG. 7 are given the same reference numerals, and description thereof will be omitted as appropriate.

  In FIG. 12, a part of each of the adjacent first and second projection images IMG1 and IMG2 is displayed overlappingly, and two projection images are displayed in a state having an overlap region OVP. At this time, it is desirable that the measurement points in each boundary region are provided in a region excluding the overlap region OVP (outside the overlap region OVP). By doing so, even when there is an overlap region between the adjacent first and second projection images IMG1 and IMG2, it is possible to adjust the boundary between the two projection images with high accuracy so as not to stand out.

  As described above, since the luminance and chromaticity of the measurement points in the boundary region between two adjacent projection images are corrected to match, the boundary portion between the two projection images becomes inconspicuous with a simple configuration and processing. It is possible to prevent the deterioration of the image quality of an image in which two projected images are displayed side by side.

  5-12, the example which adjusts the brightness | luminance and chromaticity of two adjacent projection images was demonstrated, but when three or more projection images are located in a line, the brightness | luminance of said two projection images and What is necessary is just to repeat adjustment of chromaticity.

  FIG. 13 schematically shows an example in which the multi-projector system 10 according to the first embodiment is configured with three projectors. In FIG. 13, the same parts as those in FIG. 1 or FIG.

  The multi-projector system of FIG. 13 measures the image adjustment device 200, the first projector PJ1, the second projector PJ2, the third projector PJ3, and the first and second projection images IMG1 and IMG2. An image measurement unit 300 that measures image information at a point and image information at measurement points of the second and third projection images IMG2 and IMG3 can be included.

  In FIG. 13, the third projection image IMG3 by the third projector PJ3 is displayed so as to be adjacent to the second projection image IMG2 of FIG. 5 or FIG. Therefore, in the multi-projector system shown in FIG. 13, the first and second projection images IMG1 and IMG2 of the first and second projection images IMG1 and IMG2, as shown in FIGS. The brightness and chromaticity of the first projection image IMG1 are adjusted so that the brightness and chromaticity of the two measurement points P1 and P2 match. Thereafter, as shown in FIGS. 5 to 12 for the second and third projection images IMG2 and IMG3, the brightness of the third and fourth measurement points P3 and P4 of the second and third projection images IMG2 and IMG3, and The brightness and chromaticity of the third projection image IMG3 are adjusted so that the chromaticity matches.

  FIG. 14 shows a flowchart of a processing example of the image adjustment apparatus 200 of FIG. That is, a program for realizing the processing method shown in FIG. 14 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 the image information acquisition step, the image adjustment apparatus 200 performs measurement on the first and second projection images IMG1 and IMG2 based on the measurement data from the image measurement unit 300 by the measurement data analysis unit 220 as the image information acquisition unit. Image information of points P1 and P2 is acquired (step S20). Subsequently, as an image quality adjustment control step, the image adjustment apparatus 200 calculates parameters for the first projector PJ1 in the image quality adjustment control unit 230 (step S22). The process in step S20 is the same as the process in step S10 of FIG. The process in step S22 is the same as the process in step S12 of FIG.

  Next, the image adjustment apparatus 200 uses the measurement data analysis unit 220 serving as an image information acquisition unit and the measurement data P3 and P4 in the second and third projection images IMG2 and IMG3 based on the measurement data from the image measurement unit 300. Image information is acquired (step S24). Subsequently, the image adjustment apparatus 200 calculates parameters for the third projector PJ3 in the image quality adjustment control unit 230 (step S26). The process in step S24 is the same as the process in step S10 of FIG. The process in step S26 is the same as the process in step S12 of FIG.

  That is, when adjusting an image displayed so that the second projection image IMG2 and the third projection image IMG3 by the third projector are adjacent to each other, the measurement data analysis unit 220 as the image information acquisition unit further includes: The third measurement in the boundary region AR22 closest to the third projection image IMG3 among the plurality of boundary regions AR20 to AR23 in the second projection image IMG2 including the boundary portions ED20 to ED23 of the second projection image IMG2. The boundary area closest to the second projection image IMG2 among the plurality of boundary areas AR30 to AR33 in the third projection image IMG3 including the image information at the point P3 and the boundary portions ED30 to ED33 of the third projection image IMG3 Image information at the fourth measurement point P4 in the AR 30 is acquired. Then, the image quality adjustment control unit 230 further determines that the luminance and chromaticity at the fourth measurement point P4 are the luminance and chromaticity at the third measurement point P3 based on the image information at the third and fourth measurement points P3 and P4. Parameters for adjusting the brightness and chromaticity of the entire third projection image IMG3 so as to coincide with the chromaticity are calculated.

  Thereafter, the image adjustment apparatus 200 transmits the parameters obtained in step S22 and step S26 to the first and third projectors PJ1 and PJ3, respectively (step S28), and ends the series of processes (end).

  In FIG. 14, step S20 and step S24 may be continued, and then step S22 and step S26 may be performed.

  As described above, even when three or more projection images are displayed side by side, the correction is sequentially repeated so that the luminance and chromaticity of the measurement points in the boundary area between two adjacent projection images are the same. With a simple configuration and processing, the boundary portions of the images in which three or more projection images are displayed side by side become inconspicuous, and deterioration of the image quality of the images can be prevented.

[Embodiment 2]
In the image adjustment apparatus 200 according to the first embodiment, only the luminance and chromaticity of the entire two projection images are adjusted, but the present invention is not limited to this. The image adjustment apparatus according to the second embodiment of the present invention is based on the measurement result of the image measurement unit or regardless of the measurement result in order to easily match the luminance and chromaticity of the two projection images as a whole. After the gain adjustment of the projector having a high value, the same adjustment as that in the first embodiment can be performed.

  Since the configuration of the image adjustment apparatus and the multi-projector system including the image adjustment apparatus in the second embodiment are the same as those in the first embodiment, detailed description thereof is omitted. The difference between the image adjustment apparatus in the second embodiment and the image adjustment apparatus in the first embodiment is the processing flow thereof.

  FIG. 15 is a flowchart of a processing example of the image adjustment apparatus according to the second embodiment. In FIG. 15, the same parts as those in FIG. A program for realizing the processing method shown in FIG. 15 is stored in a memory (not shown), and the CPU reads out the program stored in the memory and executes a process corresponding to the program, as shown in FIG. Processing can be realized by software processing.

  First, the image adjustment apparatus according to the second embodiment is based on the measurement result of the image measurement unit, or regardless of the measurement result, so that the difference in brightness of each projector under the same image display condition is within the threshold range. The gain of each projector is adjusted (step S30). For example, the image adjustment apparatus transmits a parameter for gain adjustment to each projector.

  Thereafter, the image adjustment apparatus uses the measurement data analysis unit 220 serving as an image information acquisition unit and the image data of the measurement points P1 and P2 in the first and second projection images IMG1 and IMG2 based on the measurement data from the image measurement unit 300. Is acquired (step S20). Subsequently, the image adjustment apparatus calculates parameters for the first projector PJ1 in the image quality adjustment control unit 230 (step S22). The process in step S20 is the same as the process in step S10 of FIG. The process in step S22 is the same as the process in step S12 of FIG.

  Next, the image adjustment apparatus 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 the measurement points P3 and P4 in the second and third projection images IMG2 and IMG3. Information is acquired (step S24). Subsequently, in the image quality adjustment control unit 230, the image adjustment device calculates parameters for the third projector PJ3 (step S26). The process in step S24 is the same as the process in step S10 of FIG. The process in step S26 is the same as the process in step S12 of FIG.

  Thereafter, the image adjustment apparatus transmits the parameters obtained in step S22 and step S26 to the first and third projectors PJ1 and PJ3, respectively (step S28), and ends the series of processes (end).

  As described above, according to the second embodiment, even when the performance variation of the projector is large, the boundary portion of the projection image can be adjusted so as to be inconspicuous.

[Modification]
In the first embodiment or the second embodiment, when adjusting the luminance and chromaticity of the projection images arranged in the horizontal direction, the luminance and chromaticity of the projection images on both sides are adjusted based on the central projection image. However, the present invention is not limited to this.

  FIG. 16 is an explanatory diagram of a projection image adjustment process in the first modification of the first embodiment or the second embodiment. FIG. 16 shows only the first to third projection images IMG1 to IMG3 projected by the first to third projectors PJ1 to PJ3.

  In the first modification, the brightness and chromaticity of the entire second projection image IMG2 are adjusted based on the brightness and chromaticity of the measurement points in the first projection image IMG1. Thereafter, the brightness and chromaticity of the entire third projection image IMG3 are adjusted based on the brightness and chromaticity after adjustment of the measurement points in the second projection image IMG2.

  Even in the first modified example, when a plurality of projection images are displayed side by side, the boundary portion of the projection image can be made inconspicuous and the deterioration of the image quality can be prevented with a simple process and configuration. .

  FIG. 17 is an explanatory diagram of a projection image adjustment process in the second modification of the first embodiment or the second embodiment. In FIG. 17, the first to fourth projection images IMG1 to IMG4 projected by the first to fourth projectors PJ1 to PJ4 are displayed so as to be adjacent in the vertical direction.

  In the second modification, the overall brightness and chromaticity of the first and third projection images IMG1 and IMG3 are adjusted based on the brightness and chromaticity of the measurement points in the second projection image IMG2. Thereafter, the brightness and chromaticity of the entire fourth projection image IMG4 are adjusted based on the brightness and chromaticity after adjustment of the measurement points in the third projection image IMG3.

  Even in the second modified example, when a plurality of projected images are displayed side by side, the boundary portion of the projected image is made inconspicuous with a simple process and configuration, and deterioration in image quality can be prevented. .

  FIG. 18 is an explanatory diagram of a projection image adjustment process in the third modification of the first embodiment or the second embodiment. In FIG. 18, the first to fifth projection images IMG1 to IMG5 projected by the first to fifth projectors PJ1 to PJ5 are displayed so as to be adjacent to each other in the horizontal and vertical directions around the second projection image IMG2. Has been.

  In the third modification, the overall brightness and chromaticity of the first and third projection images IMG1 and IMG3 are adjusted based on the brightness and chromaticity of the measurement points in the second projection image IMG2. Thereafter, the overall luminance and chromaticity of the fourth and fifth projection images IMG4 and IMG5 are adjusted based on the luminance and chromaticity of the measurement point in the second projection image IMG2.

  Even in the third modified example, when a plurality of projected images are displayed side by side, the boundary portion of the projected image is made inconspicuous with a simple process and configuration, and deterioration of image quality can be prevented. .

  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 or modifications thereof, the image adjustment device according to the present invention is provided outside the projector. However, according to the present invention, any of a plurality of projectors constituting a multi-projector system may be used. You may incorporate the function of an image adjustment apparatus.

  (2) In each of the above-described embodiments or modifications thereof, the projector has been described as an example, but the present invention is not limited to this. For example, the present invention can be applied to all types of devices that perform image display, such as liquid crystal display devices, plasma display devices, and organic EL display devices, as adjustment targets by the image adjustment device according to the present invention.

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

  (4) Although the present invention has been described as an image adjustment apparatus, an image display system, and an image adjustment method in each of the above-described embodiments or modifications thereof, 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. 1 is a diagram illustrating a basic configuration of a multi-projector system according to a first embodiment. FIG. 6 is a flowchart of a processing example of the image adjustment apparatus in FIG. 5. The figure which shows the example of the measurement point of the 1st and 2nd projection image of FIG. Explanatory drawing of the processing content of an image quality adjustment control part. Explanatory drawing of the specific processing content in an image quality adjustment control part. FIG. 6 is a diagram schematically illustrating another example of the boundary region in the first embodiment. FIG. 6 is a diagram schematically illustrating still another example of the boundary region in the first embodiment. The figure which shows typically the example of the position of the 1st and 2nd measurement point when two adjacent projection images are displayed overlappingly. FIG. 2 is a diagram schematically illustrating an example in which the multi-projector system according to the first embodiment is configured with three projectors. FIG. 14 is a flowchart of a processing example of the image adjustment apparatus in FIG. 13. FIG. 10 is a flowchart of a processing example of the image adjustment apparatus according to the second embodiment. Explanatory drawing of the adjustment process of the projection image in the 1st modification of Embodiment 1 or Embodiment 2. FIG. Explanatory drawing of the adjustment process of the projection image in the 2nd modification of Embodiment 1 or Embodiment 2. FIG. Explanatory drawing of the adjustment process of the projection image in the 3rd modification of Embodiment 1 or Embodiment 2. FIG.

Explanation of symbols

10 ... multi-projector system, 100 ... image display unit,
180 ... luminance chromaticity adjustment unit, 182 ... parameter storage unit, 184 ... signal conversion unit,
190... Image data input unit, 200... Image adjustment device, 210.
220 ... Measurement data analysis unit, 230 ... Image quality adjustment control unit, 300 ... Image measurement unit,
AR10 to AR13, AR20 to AR23, AR30 to AR33 ... boundary region,
ED10 to ED13, ED20 to ED23, ED30 to ED33 ... boundary portions,
IMG1 to IMGN ... 1st to Nth projection images,
PJ1 to PJN ... 1st to Nth projectors, P1 to P4 ... 1st to 4th measurement points

Claims (8)

An image adjustment device for adjusting an image displayed so that a first projection image projected by a first projector and a second projection image projected by a second projector are adjacent to each other,
Image information at the first measurement point in the boundary region closest to the second projection image among the plurality of boundary regions in the first projection image including the boundary portion of the first projection image, and the second An image information acquisition unit that acquires image information at a second measurement point in a boundary region closest to the first projection image among a plurality of boundary regions in the second projection image including a boundary portion of the projection image of When,
Based on the image information at the first and second measurement points, the first projection image so that the luminance and chromaticity at the first measurement point coincide with the luminance and chromaticity at the second measurement point. An image adjustment apparatus comprising: an image quality adjustment control unit that performs control for adjusting overall luminance and chromaticity. In claim 1,
The image quality adjustment control unit performs control to adjust brightness and chromaticity of the entire projection image after converting image information at a measurement point in the boundary region into color coordinates of a given color space. Adjustment device. In claim 1 or 2,
When two projected images have overlapping areas,
The image adjustment apparatus according to claim 1, wherein the measurement points in each boundary area are provided in an area excluding the overlap area. In any one of Claims 1 thru | or 3,
When adjusting an image displayed so that the second projection image and the third projection image projected by the third projector are adjacent to each other,
The image information acquisition unit
Image information at the third measurement point in the boundary region closest to the third projection image among the plurality of boundary regions in the second projection image including the boundary portion of the second projection image, and the third Obtaining image information at a fourth measurement point in a boundary region closest to the second projection image among a plurality of boundary regions in the third projection image including a boundary portion of the projection image of
The image quality adjustment control unit
Based on the image information at the third and fourth measurement points, the third projected image so that the luminance and chromaticity at the fourth measurement point coincide with the luminance and chromaticity at the third measurement point. An image adjustment apparatus that performs control to adjust overall luminance and chromaticity. An image adjustment apparatus according to any one of claims 1 to 3,
The first projector;
The second projector;
An image display system comprising: an image measurement unit that measures image information at the first and second measurement points. An image adjustment device according to claim 4,
The first projector;
The second projector;
The third projector;
An image display system comprising: image information at the first and second measurement points; and an image measurement unit that measures image information at the third and fourth measurement points. An image adjustment method for adjusting an image displayed so that a first projection image projected by a first projector and a second projection image projected by a second projector are adjacent to each other,
Image information at the first measurement point in the boundary region closest to the second projection image among the plurality of boundary regions in the first projection image including the boundary portion of the first projection image, and the second An image information acquisition step of acquiring image information at a second measurement point in a boundary region closest to the first projection image among a plurality of boundary regions in the second projection image including a boundary portion of the projection image of When,
Based on the image information at the first and second measurement points, the first projection image so that the luminance and chromaticity at the first measurement point coincide with the luminance and chromaticity at the second measurement point. An image adjustment method comprising: an image quality adjustment control step for performing control for adjusting the overall luminance and chromaticity. In claim 7,
When adjusting an image displayed so that the second projection image and the third projection image projected by the third projector are adjacent to each other,
Image information at the third measurement point in the boundary region closest to the third projection image among the plurality of boundary regions in the second projection image including the boundary portion of the second projection image, and the third Obtaining image information at a fourth measurement point in a boundary region closest to the second projection image among a plurality of boundary regions in the third projection image including a boundary portion of the projection image of
Based on the image information at the third and fourth measurement points, the third projected image so that the luminance and chromaticity at the fourth measurement point coincide with the luminance and chromaticity at the third measurement point. And a step of performing control to adjust the overall luminance and chromaticity.

Images