JP2009014951A - Multi-projection system, image processing device, projector and image processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress unwanted color tinge appearing in a superposed area due to the optical characteristics of a projector when light is reduced by an optical light shielding device in order to adjust the brightness of the superposed area in a multi-projection system. <P>SOLUTION: The multi-projection system has the image processing device 101 capable of adjusting the pixel values of three basic colors of red, green and blue for every basic color. The image processing device 101 has a color tinge suppressing function to suppress the unwanted color tinge appearing in the superposed area A due to the optical characteristics of the adjacent projectors PJ1 and PJ2 when projection images projected from the projectors PJ1 and PJ2 are partially light-reduced by the optical light shielding means (light shielding plates S1 and S2) by adjusting the pixel value of the basic color required to suppress the color tinge out of three basic colors for every basic color. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multi-projection system, an image processing apparatus used in the multi-projection system, a projector used in the multi-projection system, and an image processing method in the multi-projection system.

  There is known a multi-projection system that can generate a high-resolution, high-brightness large-screen image that cannot be realized by a single projector by projecting images projected from a plurality of projectors side by side on a screen.

  In such a multi-projection system, it is common practice to superimpose a part of adjacent projection images in order to make the joints at the boundary between images projected from adjacent projectors (referred to as projection images) inconspicuous. Yes.

FIG. 13 is a diagram showing a state in which a part of the projection images G1 and G2 from the two projectors PJ1 and PJ2 are superimposed on the screen SCR.
FIG. 14 is a diagram showing the brightness on the screen SCR when the projection as shown in FIG. 13 is performed. As shown in FIG. 14, the overlapping area A becomes brighter than the other areas, and the overlapping area A is visually recognized. In order to solve this problem, a technique called edge blending is adopted so that the brightness of the overlapping area A and the brightness of other areas are smoothed.

  As a typical technique of the edge blending technique, there is a technique (for example, refer to Patent Document 1) that adjusts the brightness of an overlapping region using an optical light shielding device such as a light shielding plate.

Japanese Patent Laid-Open No. 5-103286

  As in the technique disclosed in Patent Document 1 (hereinafter referred to as the prior art), the one that adjusts the brightness of the overlapping region with an optical light shielding device is provided with a light shielding plate as an optical light shielding device on the optical path of the projector. In general, the brightness of the superimposed region is adjusted.

  FIG. 15 is a diagram showing the brightness on the screen when appropriate brightness adjustment is performed by the light shielding plates S1 and S2. As shown in FIG. 15, if the light shielding plates S1 and S2 are installed at appropriate positions with respect to the optical paths of the projectors PJ1 and PJ2, the brightness of the entire projected image on the screen is smoothed.

  However, as shown in FIG. 15, the one that performs brightness adjustment by the light shielding plates S1 and S2 has an unnecessary color tone in the overlapping region of the projected images from the individual projectors PJ1 and PJ2 due to the influence of the optical characteristics of the projectors. May appear. In particular, bluish or reddish colors often appear due to wavelength relationships.

FIG. 16 is a diagram for explaining the colors appearing in the projection images G1 and G2 from the projectors PJ1 and PJ2. The projectors PJ1 and PJ2 are provided with the light shielding plates S1 and S2, respectively, and adjusted so that the brightness of the overlapping region and the brightness of other regions are smoothed by the light shielding plates S1 and S2, and then the projectors PJ1 and PJ2 May project different shades in the light shielding areas (corresponding to the overlapping area A) of the individual projectors PJ1 and PJ2. In FIG. 16, a case where blue appears in the projection image of the projector PJ1 and redness appears in the projection image of the projector PJ2.

  Since the drawing is not a color drawing, colors cannot be expressed. Therefore, in FIG. 16 and FIG. 17 described below, a region where blue or red appears appears in gray with gradation. .

FIG. 17 is a diagram showing a case where the projected images from the projectors PJ1 and PJ2 shown in FIG. 16 are projected onto a screen (not shown).
As shown in FIG. 17, even if the brightness of the overlapping area A and the brightness of other areas are adjusted to be smoothed by the light shielding plates S1 and S2, the projectors PJ1 and PJ2 are used as the generation sources. There is a problem that the color (redness and blueness) appearing does not result in a uniform color distribution and so-called color unevenness occurs.

  In the present invention, when adjusting the brightness of the superimposition area by the optical shading device, it is possible to suppress the unnecessary color that appears in the superimposition area due to the optical characteristics of the projector, thereby improving the quality of the projected image. An object of the present invention is to provide a multi-projection system that can be used, an image processing apparatus used in the multi-projection system, a projector used in the multi-projection system, and an image processing method in the multi-projection system.

  (1) The multi-projection system of the present invention projects a projection image from the plurality of projectors onto a screen so that a superimposed region is formed on a part of the projection image projected from an adjacent projector among the plurality of projectors. A multi-projection system having an optical shading device set so that the brightness of the superimposing region is adjusted by a predetermined amount, wherein pixel values of three basic colors of red, green, and blue are set to respective basic colors An image processing device that can be adjusted for each of the images, and the image processing device does not need to appear in the overlap region due to the optical characteristics of the projector when a part of the projection image is dimmed by the optical shading device. By adjusting the pixel value of the basic color necessary for suppressing the color among the three basic colors for each basic color. And having a function of suppressing color suppression processing.

  According to the multi-projection system of the present invention, when a part of a projection image projected from an adjacent projector is dimmed by the optical shading device, an unnecessary color that appears in the overlapping region due to the optical characteristics of the projector. It suppresses the taste. Such a color appears depending on the optical characteristics of the projector when adjusting the brightness of the overlapping region using an optical light shielding device such as a light shielding plate. Appears, even if the brightness of the entire projected image on the screen is smoothed by the optical shading device, there will be partial color unevenness, resulting in degradation of the quality of the projected image. It will also invite you.

  In order to deal with this, in the present invention, the image processing device adjusts the pixel value of the basic color necessary for suppressing the tint among the three basic colors of red, green, and blue for each basic color. Thus, the color is suppressed. By performing such a tint suppression process, an unnecessary tint can be suppressed appropriately, and a projected image can be made high quality.

(2) In the multi-projection system according to (1), the color is two types of color, a first color and a second color, and one of the adjacent projectors If the projector is a generation source of one of the first color or the second color, the image processing apparatus is a projector that is the generation source of the color It is preferable to perform the color tone suppression process with a different projector.

  This is based on the assumption that only one of the adjacent projectors is the source of the first color or the second color. For example, when there is a projector that is a source of a certain color (either one of the first color or the second color), the pixel of the color that uses the projector as the source The value is attenuated in the overlap region by the dimming effect of the optical light shielding device (such as a light shielding plate) installed in the projector, and the degree of attenuation is determined by the end of the overlap region (on the side of the projection image from the other projector). It gets bigger as it gets closer to the edge. This means that the adjustment range of the pixel value for attenuating the pixel value is narrower as it approaches the end of the overlapping region. On the other hand, the color appears more strongly at the end of the overlap region. Therefore, when the color tone is suppressed by image processing on the projector side that is the source of the color, the pixel is closer to the end of the overlapping region where the degree of color suppression should be maximized. The adjustment range of the value is narrowed, and the tint cannot be effectively suppressed.

  Therefore, in the multi-projection system of (2), color suppression processing for suppressing the color in a projector different from the projector that is the source of the color of either the first color or the second color. Like to do. Thereby, a pixel value can be adjusted (attenuated) in a wide adjustment range, and tint can be effectively suppressed.

  (3) In the multi-projection system according to (1), the color is two types of color, a first color and a second color, and one of the adjacent projectors When the projector is the first color generation source and the other projector is the second color generation source, the image processing apparatus is the first color generation source. Color tone suppression processing for suppressing the first color is performed in a projector different from the projector that is present, and the second color is suppressed in a projector that is different from the projector that is the source of the second color It is also preferable to perform a color suppression process.

  As described in (2) above, the pixel value can be set in a wide adjustment range by performing color suppression processing that suppresses the color in a projector that is different from the projector that is the source of a certain color. In other words, in the multi-projection system of (3), adjacent projectors have different colors (first). Or the second color) is assumed.

  That is, when one of the adjacent projectors is the first color source and the other projector is the second color source, the first color source is generated. Color that suppresses the second color in a projector that is different from the projector that is the source of the second color is performed by performing color suppression processing that suppresses the first color in a projector that is different from the projector The suppression process is performed. Thereby, the pixel value can be adjusted (attenuated) in a wide adjustment range for each of the first color and the second color, and the color can be effectively suppressed.

  (4) In the multi-projection system according to (2) or (3), the tint suppression process may include pixel values of the basic color corresponding to the first tint and the second tint, respectively. It is preferable to perform the attenuation process.

Thus, in a projector different from the projector that is the source of the first color, the first color is effectively reduced by attenuating the pixel value of the basic color corresponding to the first color. Can be suppressed. Also, in a projector different from the projector that is the source of the second color, the second color is effectively suppressed by attenuating the pixel value of the basic color corresponding to the second color. can do.

  For example, when the first color is a color corresponding to red (red), the red pixel value output by the projector is different from the projector that is the source of redness. By attenuating, redness can be effectively suppressed. Similarly, when the second color is a color corresponding to blue (blue), in a projector different from the projector that is the source of blue, the blue pixel value output by the projector By attenuating, the blueness can be effectively suppressed.

(5) In the multi-projection system according to (4), the process of attenuating the pixel value of the basic color includes a parameter indicating an attenuation start position of the pixel value of the basic color, and attenuation of the pixel value of the basic color It is preferable to use a parameter indicating a width from the start position to the end of attenuation and a parameter indicating the attenuation amount of the pixel value of the basic color.
By using each of these parameters, the tint suppression process can be performed appropriately.

(6) In the multi-projection system according to any one of (2) to (5), the first color and the second color are of the first color and the second color. One is a color corresponding to red, and the other is a color corresponding to blue.
This is due to the wavelength of the color, and among the three basic colors of red, green, and blue, red and blue are particularly likely to appear as colors. Therefore, by suppressing the tint corresponding to red (red tint) and the tint corresponding to blue (blue tint), it is possible to effectively prevent an unnecessary tint from appearing in the overlapping region.

(7) The image processing apparatus of the present invention projects a projection image from the plurality of projectors onto a screen so that a superimposed region is formed in a part of a projection image projected from an adjacent projector among the plurality of projectors. , An image processing apparatus used in a multi-projection system having an optical shading device set so that the brightness of the superimposition region is adjusted by a predetermined amount, and having three basic colors of red, green, and blue The pixel value can be adjusted for each basic color, and when a part of the projected image is dimmed by the optical shading device, an unnecessary color that appears in the superimposed region due to the optical characteristics of the projector, Of the three basic colors, a function of a tint suppression process that is suppressed by adjusting a pixel value of the basic color necessary for suppression of the tint for each basic color Characterized in that it.

  By using such an image processing apparatus in a multi-projection system, the multi-projection system described in (1) can be configured. Note that the image processing apparatus (7) preferably has the characteristics described in the multi-projection systems (2) to (6).

  (8) The projector of the present invention projects a projection image from the plurality of projectors onto a screen so that a superimposed region is formed in a part of a projection image projected from an adjacent projector among the plurality of projectors, A projector used in a multi-projection system having an optical shading device that is set so that the brightness of an overlapping region is adjusted by a predetermined amount, and pixel values of three basic colors of red, green, and blue, respectively The image processing device can be adjusted for each of the basic colors, and the image processing device has the superimposing region according to the optical characteristics of the projector when a part of the projection image is dimmed by the optical shading device. Adjusting the pixel value of the basic color necessary for suppressing the color of the three basic colors for each of the basic colors. Therefore and performing color suppression processing to suppress.

  By using such a projector in a multi-projection system, the multi-projection system of (1) can be configured. The projector (8) preferably has the characteristics described in the multi-projection systems (4) to (6).

  (9) In the projector according to (8), the color is two kinds of colors of a first color and a second color, and the projector is an own one of the adjacent projectors. When the different projector is the source of the color of either the first color or the second color, the image processing device is a projector different from itself among the adjacent projectors. It is preferable to perform the tint suppression process that suppresses the tint that appears as a generation source.

  This is the case where one of the adjacent projectors is the projector itself, and the other projector is a projector different from the projector, and the color processing that appears with the other projector as the source is suppressed by the image processing device that the projector has. Color tone suppression processing is performed. That is, the tint suppression process is performed by a projector different from the projector that is the source of the tint, and the same effect as the multi-projection system of (2) can be obtained.

  (10) In the projector according to (8), the color is two types of color, a first color and a second color, and among the adjacent projectors, the color is When the first color generation source and the other projector are the second color generation source, the image processing apparatus uses a projector different from itself among the adjacent projectors as the generation source. It is preferable to perform a tint suppression process that suppresses the second tint appearing.

  This is based on the assumption that each of the adjacent projectors becomes a generation source of a different color (first color or second color). For example, if the projector itself is the first color generation source and the projector different from the first color generation source is the second color generation source, the image processing apparatus of its own is the generation source of the other projector. Thus, the color (second color) appearing is suppressed, and according to this, the same effect as the multi-projection system of (3) can be obtained.

  (11) In the image processing method in the multi-projection system of the present invention, the projection images from the plurality of projectors are formed such that a superimposed region is formed in a part of the projection image projected from an adjacent projector among the plurality of projectors. An image processing method in a multi-projection system that projects on a screen and has an optical shading device set so that the brightness of the superimposed region is adjusted by a predetermined amount, and includes three basic colors of red, green, and blue An image processing device capable of adjusting the pixel value of each basic color is provided, and when a portion of the projection image is dimmed by the optical shading device, it appears in the superimposing region due to the optical characteristics of the projector Of the three basic colors, the basic color pixel values necessary for the suppression of the tint are set for each basic color. Which comprises suppressing by adjusting the.

  By performing such image processing in the multi-projection system, the tint suppression processing described in the multi-projection system of (1) can be performed. Note that the image processing method in the multi-multi-projection system described in (11) preferably has the same characteristics as the multi-projection system described in (2) to (6).

Hereinafter, embodiments of the present invention will be described.
The multi-projection system of the present invention can also be used as a multi-projection system that allows a large number of projectors to be displayed on a large screen like a movie theater screen by installing a large number of projectors in the vertical and horizontal directions. In the embodiment to be described, a multi-projection system in which two projectors PJ1 and PJ2 are arranged in the horizontal direction will be described as an example for simplification of description.

  FIG. 1 is a diagram schematically showing an overall configuration of a multi-projection system according to an embodiment of the present invention. As shown in FIG. 1, the multi-projection system according to the embodiment of the present invention includes two projectors PJ1 and PJ2 that project the images G1 and G2 in a state where the overlapping region A is partly on the screen SCR. And light shielding plates S1 and S2 as optical light shielding devices for adjusting the brightness of the overlapping region A, and an information processing device 100 such as a personal computer (PC).

  The information processing apparatus 100 includes, as one of its functions, an image processing apparatus 101 that can execute a brightness adjustment of the superimposing area A and a tint suppression process that suppresses an unnecessary tint that appears in the superimposing area A by image processing. . A specific configuration of the information processing apparatus 100 will be described later with reference to FIG.

  In the multi-projection system according to the embodiment of the present invention configured as described above, when adjusting the brightness of the overlapping region A, first, the brightness of the entire projected image is smoothed as much as possible by the light shielding plates S1 and S2. The brightness of the overlapping area is adjusted to such a degree that the light shielding plates S1 and S2 are fixed in that state, and then the brightness of the overlapping area is determined according to the brightness adjustment state by the light shielding plates S1 and S2. The degree of brightness adjustment is set by the image processing apparatus 101, and the image processing apparatus 101 performs an operation of performing brightness adjustment based on the set degree of brightness adjustment. By performing such an operation, it is possible to easily and appropriately adjust the brightness of the overlapping region. Depending on the brightness adjustment state by the light shielding plates S1 and S2, it may not be necessary to perform the brightness adjustment by the image processing apparatus 101 at all.

  By the way, as described above, when the brightness is adjusted by the light shielding plates S1 and S2, unnecessary colors (redness and blueness) appear in the overlapping region A due to the optical characteristics of the projectors PJ1 and PJ2. (See FIGS. 16 and 17).

  In the present invention, the tint suppression processing for suppressing such tint is performed by image processing. In the embodiment of the present invention, when a white image is projected from the projectors PJ1 and PJ2, blue color with the projector PJ1 as a generation source appears in the overlapping area A, and red color with the projector PJ2 as a generation source appears. The case will be described. Hereinafter, an example in which the tint suppression process that suppresses the tint appearing in the overlapping region A is performed by image processing will be described with reference to FIGS. First, the tint suppression process for blue tint will be described. 2 to 11, the screen SCR shown in FIG. 1 is not shown.

FIG. 2 is a diagram for explaining a case where attention is paid to only the blueness of redness and blueness appearing in the projected images G1 and G2 on the screen. As shown in FIG. 2, a blue color appears in the superimposed region A in the projection image G1 from the projector PJ1 on the screen.
As described above, since the drawing cannot express a color, in FIGS. 2 to 11 for explaining the embodiment of the present invention, a region where blue or red appears appears in gray with gradation. Show. In addition, it has shown that bluish or reddish appears with higher intensity | strength, so that the area | region where gray is dark.

FIG. 3 is a diagram showing the intensity of blue pixel values in the entire projected image on the screen when the bluish color shown in FIG. 2 appears on the screen. In the superimposition area A, bluish light that originates from the projector PJ1 appears. As shown in FIG. 3A, when attention is paid to the projection image G1, bluish light appears in the superimposing area A, and the bluish color The intensity increases as it approaches the end on the projection image G2 side (referred to as the right end in the drawing of the overlapping area A). FIG. 3B shows the intensity of the blue pixel value on the screen. As shown in FIG. 3B, in the entire projected image (projected images G1, G2) on the screen, the intensity of the blue pixel value is higher in the superimposed region A due to the influence of bluish color appearing in the projected image G1. The intensity of the blue pixel value increases as it approaches the right end of the superimposed region A in the figure.

FIG. 4 is a diagram for explaining blue pixel values when attention is paid only to the projected image G1 on the screen. FIG. 4A shows the projection image G1 extracted from FIG. 3A and shows a state in which unnecessary blueness appears. FIG. 4B shows the original blue pixel value on the screen with respect to the output of the projector PJ1.
As shown in FIG. 4B, the blue pixel value on the screen corresponding to the output from the projector PJ1 is attenuated in the overlapping region A due to the dimming effect of the light shielding plate S1 provided for the projector PJ1. However, as described above, when the light is reduced by the light shielding plate, an unnecessary color (blue in this case) as shown in FIG. Appears.

This unnecessary blueness can be suppressed by attenuating the blue pixel value of the projector PJ1. However, as shown in FIG. 4B, the blue pixel value on the screen with respect to the output from the projector PJ1 is attenuated in the overlapping area A due to the dimming effect of the light shielding plate S1, and the degree of attenuation is It becomes larger as it approaches the right end portion of A shown in the figure, and becomes almost zero at the right end portion of the overlapping area A shown in the drawing.
This means that in the projector PJ1, the pixel value adjustment range for attenuating the pixel value is narrower as it approaches the right end of the superimposed region A in the figure. That is, in the projector PJ1, the blue pixel value adjustment range is narrower and the attenuation amount of the blue pixel value is increased as it approaches the right end portion in the figure of the overlapping region A where the degree of unnecessary blueness suppression should be maximized. It means that it can not be taken. Therefore, even if it is attempted to suppress the blueness appearing from the projector PJ1 by attenuating the pixel value on the projector PJ1 side, the blue pixel value cannot be greatly attenuated, and the blueness The suppression effect is low, and effective suppression processing cannot be performed.

  Therefore, in the present invention, a tint suppression process is performed in a projector (in this case, projector PJ2) that is different from the projector (in this case, projector PJ1) that is the source of unnecessary tint (in this case, bluish). The process which suppresses blueness is performed by.

FIG. 5 is a diagram showing pixel values of a projection image G2 from a projector PJ2 different from the projector PJ1 that is a source of blueness. As shown in FIG. 5 (a), in the overlapping area A of the projection image on the projector PJ2 side, bluish color having the projector PJ1 as a source appears. FIG. 5B shows a blue pixel value on the screen with respect to the output of the projector PJ2.
As shown in FIG. 5B, in the region where the blue color with the projector PJ1 as the source appears more intensely (for example, the region L1 in FIG. 5A), the output from the projector PJ2 is on the screen. The blue pixel value is less affected by light reduction by the light shielding plate S2 installed in the projector PJ2.
For this reason, in the region L1, it is possible to increase the attenuation amount of the blue pixel value output from the projector PJ2. Note that the region L1 is a region where it is necessary to further increase the degree of blueness suppression, and in the region L1, it is necessary to increase the attenuation amount of the blue pixel value.

  Therefore, the image processing apparatus 101 performs a tint suppression process in which the attenuation amount of the blue pixel value output from the projector PJ2 becomes larger in the region L1. Such a tint suppression process is possible because the adjustment range of the pixel value on the projector PJ2 side corresponding to the region L1 is wide, and the attenuation amount of the blue pixel value output from the projector PJ2 is the region L1. The pixel value can be adjusted so as to be larger.

  As described above, the blue pixel value attenuation amount output from the projector PJ2 becomes larger in the region L1, so that the blue color appearing with the projector PJ1 as a generation source can be more effectively suppressed. Blueness appearing in the overlapping area A on the screen SCR can be suppressed.

  FIG. 6 is a diagram illustrating an example of a tint suppression process on the projector PJ2 side performed by the image processing apparatus 101. As shown in FIGS. 6A and 6B, the image processing apparatus 101 has a color such that the attenuation amount of the blue pixel value output from the projector PJ2 is larger for the region L1 in the overlapping region A. Perform taste suppression processing. By performing such a tint suppression process, on the projector PJ2 side, the blue pixel value output by itself is attenuated as shown in FIG. 6B, whereby the intensity is high in the overlapping region on the screen. The blue pixel value (see FIG. 3B) is offset. Thereby, the bluish color appearing in the overlapping area A on the screen can be suppressed, and the bluish color can be made difficult to visually recognize.

  In the above, the process of suppressing the blueness appearing in the overlapping area A on the screen using the projector PJ1 as the generation source has been described, but the redness appearing in the overlapping area A on the screen using the projector PJ2 as the generation source has been described. The processing to be performed can be performed by the same procedure.

  FIG. 7 is a diagram illustrating a case where attention is paid only to redness among redness and blueness appearing in the projected images G1 and G2 on the screen. As shown in FIG. 7, redness appears in the superimposed region A in the projection image G2 from the projector PJ2 on the screen.

  FIG. 8 is a diagram showing the intensity of red pixel values in the entire projected image on the screen when redness as shown in FIG. 7 appears on the screen. In the superimposition area A, redness appears from the projector PJ2 as a generation source. As shown in FIG. 8A, when attention is paid to the projection image G2, redness appears in the superposition area A. The intensity increases as it approaches the end on the projection image G1 side (referred to as the left end in the figure of the overlapping region A). FIG. 8B shows the intensity of red pixel values on the screen. As shown in FIG. 8B, in the entire projected image on the screen (projected images G1, G2), the intensity of the red pixel value in the overlapping region A becomes higher due to the influence of redness appearing in the projected image G2. The intensity of the red pixel value increases as it approaches the left end of the superimposed region A in the figure.

FIG. 9 is a diagram for explaining red pixel values when attention is paid only to the projection image G2 on the screen. FIG. 9 (a) shows the projection image G2 extracted from FIG. 8 (a) and shows an unnecessary redness. FIG. 9B shows the original red pixel value on the screen with respect to the output of the projector PJ2.
As shown in FIG. 9B, the red pixel value on the screen with respect to the output from the projector PJ2 is attenuated in the overlapping region A due to the dimming effect of the light shielding plate S2 provided for the projector PJ2. However, as described above, when the light is reduced by the light shielding plate, an unnecessary color (in this case, red) as shown in FIG. Appears. This unnecessary redness can be suppressed by attenuating the red pixel value of the projector PJ2. However, for the same reason as in the case of blueness, the redness due to the attenuation of the red pixel value in the projector PJ2 is considered. The effect of suppressing taste cannot be expected so much.

That is, as shown in FIG. 9B, the red pixel value on the screen with respect to the output from the projector PJ2 is attenuated in the overlapping region A due to the dimming effect of the light shielding plate S2, and the degree of attenuation is This is because it becomes larger as it approaches the left end portion of A in the figure, and becomes almost zero at the left end portion of the overlapping area A in the figure.
This means that, in the projector PJ2, the adjustment range of the pixel value for attenuating the pixel value is narrower as it approaches the left end of the overlapping area A in the figure. That is, in the projector PJ2, the red pixel value adjustment range becomes narrower as it approaches the left end in the figure of the overlapping region A where the degree of suppression of redness should be maximized, and the attenuation amount of the red pixel value cannot be increased. Therefore, it means that the reddish suppression effect is low. Therefore, even if it is attempted to suppress the redness appearing from the projector PJ2 by attenuating the pixel value on the projector PJ2 side, the attenuation amount of the red pixel value cannot be increased, and the redness is reduced. The suppression effect is low, and effective suppression processing cannot be performed.

  Therefore, in the same manner as the above-described tint suppression process for blue, the projector (in this case, projector PJ1) is different from the projector (in this case, projector PJ2) that is the source of the unwanted tint (in this case, red). ), A process for suppressing redness is performed.

FIG. 10 is a diagram illustrating pixel values of a projection image G1 from a projector PJ1 different from the projector PJ2 that is a redness generation source. As shown in FIG. 10A, a reddish color having the projector PJ2 as a source appears in the overlapping area A of the projection image on the projector PJ1 side. FIG. 10B shows red pixel values on the screen with respect to the output of the projector PJ1.
As shown in FIG. 10 (b), in the region where the reddish with the projector PJ2 as the source appears more intensely (for example, the region L2 in FIG. 10 (a)), the output from the projector PJ1 is on the screen. The red pixel value is less affected by light reduction by the light shielding plate S1 installed in the projector PJ1.
For this reason, in the region L2, the attenuation amount of the red pixel value output from the projector PJ1 can be increased. Note that the region L2 is a region where the degree of suppression of redness needs to be increased, and in the region L2, the attenuation amount of the red pixel value needs to be increased.

  Therefore, the image processing apparatus 101 performs a tint suppression process such that the attenuation amount of the red pixel value output from the projector PJ1 is larger in the region L2. Such a tint suppression process is possible because the adjustment range of the pixel value on the projector PJ1 side corresponding to the region L2 is wide, and the attenuation amount of the red pixel value output from the projector PJ1 is the region L2. The pixel value can be adjusted so as to be larger.

  As described above, the attenuation amount of the red pixel value output from the projector PJ1 becomes larger in the region L2, so that redness appearing with the projector PJ2 as a generation source can be more effectively suppressed. Redness appearing in the overlapping area A on the screen SCR can be suppressed.

  FIG. 11 is a diagram illustrating an example of a tint suppression process on the projector PJ1 side performed by the image processing apparatus 101. As shown in FIGS. 11A and 11B, the image processing apparatus 101 has a color in which the attenuation amount of the red pixel value output from the projector PJ1 is larger for the region L2 in the overlapping region A. Perform taste suppression processing.

By performing such a tint suppression process, on the projector PJ1 side, the red pixel value output by itself is attenuated as shown in FIG. 11B, whereby the intensity is high in the overlapping region on the screen. The red pixel value (see FIG. 8B) is offset. Thereby, the redness which appears in the overlapping area A on the screen can be suppressed, and the redness can be made difficult to visually recognize.

  As described above, with respect to the blueness appearing in the overlapping area A on the screen with the projector PJ1 as the generation source, the blueness is different from the projector PJ2 side different from the projector PJ1 that is the generation source of blueness. For the redness appearing in the overlapping area A on the screen with the projector PJ2 serving as a generation source, a projector PJ1 different from the projector PJ2 serving as the redness generation source is applied. Color suppression processing for suppressing redness is performed on the side. Thereby, in each projector PJ1 and PJ2, the pixel value of the color corresponding to an unnecessary color can be attenuated with a sufficient attenuation amount, and even for a region where bluishness or redness appears strongly, The tint can be appropriately suppressed.

  The correction parameters used when performing the image processing as described above include a parameter indicating the attenuation start position of the pixel value (referred to as attenuation start position parameter) and a width from the attenuation start position of the pixel value to the end of attenuation. And a parameter (referred to as attenuation amount parameter) indicating how much the pixel value is attenuated, that is, how much the pixel value is attenuated. Then, by appropriately setting these parameters, it is possible to effectively suppress the respective colors. These correction parameters can be set empirically by the user, for example, but each of these correction parameters can be set based on the captured image data obtained by capturing the projected image on the screen by an imaging device or the like. It is also possible to set parameters.

  FIG. 12 is a block diagram showing the configuration of the multi-projection system according to the embodiment of the present invention. As shown in FIG. 12, the multi-projection system according to the embodiment of the present invention includes projectors PJ1 and PJ2 and an information processing apparatus (PC) 100. Moreover, the imaging device 200 which images the projection image on the screen SCR is provided as needed.

  The information processing apparatus 100 includes an image data storage unit 102 that stores image data to be displayed, a partial image to be projected by the projectors PJ1 and PJ2 from the image data stored in the image data storage unit 102, and the brightness of the superimposed region. Image processing apparatus 101 that performs various image processing such as color adjustment that suppresses unnecessary color appearing in the adjustment and superimposition region, processing that outputs image data processed by image processing apparatus 101 to a corresponding projector, and the like An image display control unit 103 that performs various processes for image display, and a captured image data analysis unit 105 that analyzes the brightness of the superimposed region based on the captured image data captured by the imaging apparatus 200 are included.

  Note that the imaging device 200 and the captured image data analysis unit 105 can be provided as necessary. For example, the imaging device 200 is necessary when performing a tint suppression process by image processing based on captured image data obtained by capturing a projection image on the screen SCR.

  Since the multi-projection system according to the embodiment has such a configuration, the color suppression processing described so far can be performed. Note that the tint suppression processing performed by the image processing apparatus 101 has already been described with reference to FIGS.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the following modifications can be made.

  (1) In the above-described embodiment, the blueness appears by one projector PJ1 of the adjacent projectors PJ1 and PJ2, and the redness appears by the other projector PJ2. Although the suppression process has been described, depending on the situation, there may be a case where only one of the blue or reddish colors appears from only one of the adjacent projectors. Even in such a case, the present invention is applicable. That is, when only one of the adjacent projectors is the source of the blue or red color, the projector is different from the projector that is the source of the color. By performing the tint suppression process as described in the embodiment, the pixel value of the color corresponding to the tint can be attenuated, and the tint appearing in the overlapping region can be suppressed.

  (2) In the above-described embodiment, the case where the tint suppression process is performed by the image processing apparatus 101 included in the information processing apparatus 100 is exemplified, but the projectors PJ1 and PJ2 have the same image processing function as the image processing apparatus 101. In such a case, the tint suppression process may be performed on each projector PJ1, PJ2. In this case, the image processing apparatus 101 provided on each projector PJ1, PJ2 side performs the tint suppression process as described above.

  Further, not only the color suppression processing by the image processing apparatus 101 but also the brightness adjustment of the superimposition area performed on the information processing apparatus 100 side, the captured image data analysis processing by the captured image data analysis unit 105, and the image display control unit 103 It is also possible to provide each processing function such as image display control processing on each projector PJ1, PJ2 side, and to perform each processing on each projector PJ1, PJ2.

  (3) In the above-described embodiment, the multi-projection system in which the two projectors PJ1 and PJ2 are arranged in the horizontal direction is illustrated. However, the multi-projection system of the present invention arranges the two projectors PJ1 and PJ2 in the vertical direction. It may be a multi-projection system, or may be a multi-projection system in which a large number of projectors are installed in the vertical and horizontal directions to enable display on a large screen.

(4) The multi-projection system of the present invention may be either a front projection type multi-projection system or a rear projection type multi-projection system.
(5) The projector used in the multi-projection system of the present invention may be a projector using a liquid crystal panel as a light modulation element, or may be a projector using a micromirror.

1 is a diagram schematically showing an overall configuration of a multi-projection system according to an embodiment of the present invention. The figure explaining the case where it pays attention only to the blueness among the redness and blueness which appear in the projection images G1 and G2 on the screen SCR. The figure shown about the intensity | strength of the blue pixel value in the whole projection image on a screen when blueness as shown in FIG. 2 appears on the screen. The figure explaining the blue pixel value when paying attention only to the projection image G1 on a screen. The figure which shows the pixel value of the projection image G2 from the projector PJ2 different from the projector PJ1 used as the generation source of bluishness. The figure which shows an example of the tint suppression process in the projector PJ2 side which the image processing apparatus 101 performs. The figure explaining the case where it pays attention only to redness among the redness and blueness which appear in the projection images G1 and G2 on a screen. The figure shown about the intensity | strength of the red pixel value in the whole projection image on a screen when redness as shown in FIG. 7 appears on the screen. The figure explaining the red pixel value when paying attention only to the projection image G2 on a screen. The figure which shows the pixel value of the projection image G1 from the projector PJ1 different from the projector PJ2 used as the generation source of redness. FIG. 5 is a diagram illustrating an example of a tint suppression process on the projector PJ1 side that is performed by the image processing apparatus 101. 1 is a block diagram showing a configuration of a multi-projection system according to an embodiment of the present invention. The figure which shows the state on which the part of the projection image from two projectors PJ1 and PJ2 was superimposed on the screen. The figure which shows the brightness on the screen at the time of performing a projection as shown in FIG. The figure which shows the brightness on a screen in case appropriate brightness adjustment is made with the light-shielding plate. The figure explaining the color which appears in the projection image from projector PJ1, PJ2. The figure which shows the case where the projection image from the projectors PJ1 and PJ2 as shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Information processing apparatus, 101 ... Image processing apparatus, 102 ... Image data storage part, 103 ... Image display control part, 105 ... Captured image data analysis part, 200 ... Imaging apparatus A ... Superimposition area, PJ1, PJ2 ... Projector, S1, S2 ... Shading plate, G1, G2 ... Projection image, SCR ... Screen

Claims (11)

A projected image from the plurality of projectors is projected onto a screen so that a superimposed region is formed on a part of a projected image projected from an adjacent projector among the plurality of projectors, and the brightness of the superimposed region is a predetermined amount A multi-projection system having an optical shading device set to be adjusted,
An image processing device that can adjust pixel values of three basic colors of red, green, and blue for each basic color, and the image processing device reduces a part of the projected image by the optical shading device. For each basic color, an unnecessary color that appears in the superimposition region due to the optical characteristics of the projector when illuminated, and a pixel value of the basic color that is necessary for suppressing the color among the three basic colors. A multi-projection system having a function of a tint suppression process that is suppressed by adjusting to the above. The multi-projection system according to claim 1.
The colors are two types of colors, a first color and a second color, and one of the adjacent projectors has the first color or the second color. When it is a source of any of the colors
The multi-projection system, wherein the image processing device performs the tint suppression process with a projector different from the projector that is the color generation source. The multi-projection system according to claim 1.
The colors are two kinds of colors, a first color and a second color, and one of the adjacent projectors is a source of the first color and the other is a projector. Is the source of the second color,
The image processing apparatus includes:
A projector that performs a tint suppression process that suppresses the first tint in a projector that is different from the projector that is the first tint generation source, and the second tint generation source; A multi-projection system, wherein a color suppression process for suppressing the second color is performed in different projectors. The multi-projection system according to claim 2 or 3,
The multi-projection system characterized in that the tint suppression process performs a process of attenuating pixel values of the basic color corresponding to the first color and the second color, respectively. The multi-projection system according to claim 4,
The process of attenuating the pixel value of the basic color includes a parameter indicating an attenuation start position of the pixel value of the basic color, a parameter indicating a width from the attenuation start position of the pixel value of the basic color to the end of attenuation, and the basic color A multi-projection system characterized by performing using a parameter indicating an attenuation amount of a pixel value. In the multi-projection system in any one of Claims 2-5,
The first color and the second color are such that one of the first color and the second color is a color corresponding to red and the other is a color corresponding to blue. A featured multi-projection system. A projected image from the plurality of projectors is projected onto a screen so that a superimposed region is formed on a part of a projected image projected from an adjacent projector among the plurality of projectors, and the brightness of the superimposed region is a predetermined amount An image processing apparatus used in a multi-projection system having an optical shading device set to be adjusted,
The pixel values of three basic colors of red, green, and blue can be adjusted for each basic color, and when a part of the projection image is dimmed by the optical shading device, the optical characteristics of the projector A tint suppression process for suppressing unnecessary tints appearing in the superimposing region by adjusting pixel values of the basic colors necessary for suppressing the tint among the three basic colors for each basic color; An image processing apparatus having a function. A projected image from the plurality of projectors is projected onto a screen so that a superimposed region is formed on a part of a projected image projected from an adjacent projector among the plurality of projectors, and the brightness of the superimposed region is a predetermined amount A projector used in a multi-projection system having an optical shading device set to be adjusted,
An image processing device that can adjust pixel values of three basic colors of red, green, and blue for each basic color, and the image processing device reduces a part of the projected image by the optical shading device. For each basic color, an unnecessary color that appears in the superimposition region due to the optical characteristics of the projector when illuminated, and a pixel value of the basic color that is necessary for suppressing the color among the three basic colors. A projector that performs a tint suppression process that is suppressed by adjusting to the above. The projector according to claim 8, wherein
The colors are two types of colors, a first color and a second color, and a projector different from itself among the adjacent projectors is the first color or the second color. Assuming that any one of the colors is a source of color,
The projector according to claim 1, wherein the image processing apparatus performs the tint suppression process that suppresses the tint that appears from a projector different from the projector of the adjacent projector. The projector according to claim 8, wherein
The colors are two kinds of colors, a first color and a second color, and among the adjacent projectors, the first color is a source of the first color, and the other projector is the color When it is the source of the second color,
The image processing apparatus includes:
A projector that performs a tint suppression process that suppresses the second tint that appears from a projector different from itself among the adjacent projectors. A projected image from the plurality of projectors is projected onto a screen so that a superimposed region is formed on a part of a projected image projected from an adjacent projector among the plurality of projectors, and the brightness of the superimposed region is a predetermined amount An image processing method in a multi-projection system having an optical shading device set to be adjusted,
An image processing device is provided that can adjust the pixel values of three basic colors of red, green, and blue for each basic color,
When a part of the projected image is dimmed by the optical shading device, an unnecessary color that appears in the superposition region due to the optical characteristics of the projector is used to suppress the color among the three basic colors. An image processing method in a multi-projection system, wherein a necessary pixel value of the basic color is suppressed by adjusting for each basic color.