JP2008311898A - Multi-projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily adjust the brightness of a superimposed region in a multi-projection system. <P>SOLUTION: The multi-projection system for projecting projection images from projectors PJ1 and PJ2 onto a screen SCR so as to form the superimposed region in a part of the projection images projected from the adjacent projectors PJ1 and PJ2 includes: light shielding plates S1 and S2 as optical light shielding apparatuses set so as to adjust the brightness of the superimposed region for a prescribed amount; and an image processor 101 capable of setting the degree of the brightness adjustment of the superimposed region corresponding to a brightness adjustment state by the light shielding plates S1 and S2 and executing the brightness adjustment based on the set degree of the brightness adjustment. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multi-projection system, a projector used in the multi-projection system, and a brightness adjustment method for an overlapping region 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. 5 is a diagram showing a state in which a part of the projection image from the two projectors PJ1, PJ2 is superimposed on the screen.
FIG. 6 is a diagram showing the brightness on the screen when the projection shown in FIG. 5 is performed. As shown in FIG. 6, the overlapping area A becomes brighter than 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, a technique for adjusting the brightness of the overlapping area using an optical light shielding device such as a light shielding plate (for example, refer to Patent Document 1), and software for superimposing the area by image processing. A technique for adjusting brightness (for example, see Patent Document 2), a technique for adjusting brightness by combining an optical light shielding device and image processing (for example, see Patent Document 3), and the like.

JP-A-5-103286 JP 2002-116500 A JP 2001-343704 A

  As in the technique disclosed in Patent Document 1 (referred to as the first conventional technique), an apparatus that adjusts the brightness of an overlapping region using 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. At this time, since it is necessary to adjust the installation position of the light-shielding plate with respect to the projector with high accuracy, a skilled advanced adjustment technique is required.

  FIG. 7 is a diagram illustrating the brightness on the screen when appropriate brightness adjustment is performed by the light shielding plate. As shown in FIG. 7, if the light shielding plates S1, S2 are installed at appropriate positions with respect to the optical paths of the projectors PJ1, PJ2, the brightness of the entire projected image is smoothed. However, adjustment of the positional relationship between the light shielding plate and the optical path is delicate.

  For example, FIG. 8 is a diagram illustrating an example of brightness on the screen when the installation position of the light shielding plate is shifted. Note that FIG. 8 is an example in which the brightness of the overlapping region is darker than the other regions due to the positional deviation of the light shielding plate S2 while the positions of the projectors PJ1 and PJ2 remain unchanged.

FIG. 9 is a diagram illustrating an example of brightness on the screen when the installation position of the projector is shifted. FIG. 9 shows an example in which the brightness of the superimposition region is brighter than the other regions due to the positional shift of the projector PJ2 while the positions of the light shielding plates S1 and S2 remain unchanged.
As can be seen from the examples of FIGS. 8 and 9, it is important to set the positional relationship between the light shielding plates S1 and S2 and the projectors PJ1 and PJ2 with high accuracy in order to smooth the brightness of the entire projection image. .

  Moreover, even when the positional relationship between the light shielding plates S1 and S2 and the projectors PJ1 and PJ2 is set with high accuracy so that the brightness of the entire projection image is smoothed at the beginning of the construction of the multi-projection system, nothing will happen. For this reason, there may be a deviation in the positional relationship between the light shielding plates S1 and S2 and the projectors PJ1 and PJ2. In such a case, re-setting the positional relationship between the light shielding plates S1 and S2 and the projectors PJ1 and PJ2 so that the brightness of the entire projected image is smoothed requires a skilled technique and is not an expert. Generally, it cannot be handled by ordinary users.

  Further, if there is an individual difference between projectors used in the multi-projection system (illuminance difference due to lamp performance, etc.), as shown in FIG. 10, the brightness of the entire projected image is not appropriately smoothed. Therefore, when one of the projectors constituting the multi-projection system is replaced, even if the entire projection image is initially smoothed, the brightness smoothing is lost, and again, It is necessary to adjust the brightness.

  In addition, the brightness adjustment by the light shielding plate has a large brightness adjustment effect in the superimposition region for at least one of the image having a low pixel value and the image having a high spatial frequency, but the pixel value such that the entire surface is white. There is also a problem that the brightness adjustment effect of the superimposed region is low for at least one of the high image and the low spatial frequency image.

  On the other hand, since the technique that performs brightness adjustment by image processing, such as the technique disclosed in Patent Document 2 (referred to as the second conventional technique), can perform independent image processing for each pixel value, Brightness adjustment with high flexibility can be performed on the overlapping region. Therefore, as in the above example, the brightness of the superimposed area can be adjusted flexibly with respect to the positional deviation of the light shielding plate, the projector, etc., and the individual difference between the projectors. Smoothing can be realized easily.

  However, brightness adjustment by image processing is smooth, for example, as shown in FIG. 11 because image data with a low pixel value has a small margin for attenuating the pixel value (brightness value) or more. There is a problem that the effect of conversion is small. In particular, for a black image signal, since the pixel value is equal to zero, the pixel value (luminance value) cannot be further attenuated. For this reason, there is a problem that the superimposition region stands out, which is equivalent to no brightness adjustment effect.

  In addition, as in the technique disclosed in Patent Document 3 (referred to as “third conventional technique”), a combination of an optical shading device and image processing is certainly considered as if the above-described problem is solved. It is done. However, simply combining the optical shading device and image processing may not solve the problems shown in the first and second prior arts for extreme images such as white and black. .

The present invention is a multi-projection system that enables appropriate brightness adjustment regardless of the pixel value or spatial frequency of a projected image, and that can be performed by an unskilled person without adjusting the brightness of a superimposed region, It is an object of the present invention to provide a projector for use in a multi-projection system and a method for adjusting the brightness of an overlapping area in the multi-projection system.

  (1) The multi-projection system of the present invention projects a projection image from a plurality of projectors onto a screen so that a superimposed region is formed on a part of a projection image projected from an adjacent projector among the plurality of projectors. In the multi-projection system, an optical shading device set so that the brightness of the superimposing region is adjusted by a predetermined amount, and the brightness of the superimposing region according to a brightness adjustment state by the optical shading device And an image processing apparatus capable of performing brightness adjustment based on the set brightness adjustment level.

  In the multi-projection system of the present invention, the brightness of the superimposed image is adjusted by combining an optical light shielding device such as a light shielding plate and software image processing, thereby smoothing the brightness of the projected image on the screen. It is to become.

  In the multi-projection system of the present invention, the optical shading device is set so that the brightness of the overlapping area is adjusted by a predetermined amount when the brightness of the overlapping area is adjusted. Brightness adjustment by image processing is performed based on the brightness adjustment state by the light shielding device. That is, first, the position of the optical shading device is set to such an extent that the brightness of the entire projected image is as smooth as possible, and in that state, the brightness is adjusted by a necessary amount by image processing. Depending on the brightness adjustment state by the optical shading device, it may not be necessary to perform the brightness adjustment by the image processing device at all.

  Thus, in the multi-projection system of the present invention, brightness adjustment is performed by image processing so as to compensate for the lack of brightness adjustment by the optical shading device by image processing. As a result, the strictness required for the setting of the optical shading device (such as the position adjustment of the shading plate) is relatively small. Is possible. Therefore, for example, when constructing a multi-projection system, even if the optical shading device is set to an optimal position by an expert and then the optical shading device is misaligned for some reason, Since the insufficient brightness adjustment due to the positional deviation of the optical shading device can be compensated for by image processing, smoothness of the brightness of the projected image can be maintained even if it is not an expert.

  (2) In the multi-projection system according to (1), the image processing device sets the degree of brightness adjustment of the superimposed region according to at least one of a pixel value and a spatial frequency of an image to be displayed. It is preferable.

  The brightness adjustment by the optical shading device can appropriately adjust the brightness for an image with a low pixel value or an image with a high spatial frequency, and the brightness adjustment effect of the overlapping region is high. For example, when the image to be displayed is an image having a high spatial frequency such as a natural scenery, it is sufficiently possible to make it difficult to visually recognize the overlapped area only by the optical shading device.

  On the other hand, when the image to be displayed is a white image as a whole, for example, a screen for presentation or a snow scene with a white surface, the optical shading device is used when the pixel value is high and the spatial frequency is low. Even if it is installed at an appropriate position, the overlapping area is easily visible.

Therefore, it is preferable to set the degree of brightness adjustment by image processing according to at least one of the pixel value and the spatial frequency of the image to be displayed. As an example, in the case of an image with a high spatial frequency such as a natural scenery, brightness adjustment by an optical shading device is sufficient,
If the brightness adjustment by image processing is performed in addition to the brightness adjustment by the optical shading device, the pixel value is excessively attenuated, and on the contrary, it becomes easy to visually recognize the superimposed region. Do not adjust the brightness.

  (3) In the multi-projection system according to (1) or (2), the image processing device may set the degree of brightness adjustment of the superimposed region according to individual differences between the plurality of projectors. Also preferred.

At present, a plurality of projectors constituting a multi-projection system display images with different performances. This is often caused by differences in the maximum illuminance due to the difference in performance of the lamps used in each projector, the spatial distribution of color unevenness in each projector, and the like. If these are ignored, even if the installation position of the optical light-shielding device is adjusted appropriately, the brightness of the overlapped area varies depending on the individual difference of each projector.
For this reason, it is preferable to set the degree of brightness adjustment by image processing according to the individual difference of each projector. This makes it possible to adjust the brightness by absorbing individual differences among the projectors.

(4) In the multi-projection system according to any one of (1) to (3), the brightness adjustment degree is a parameter indicating a change start position of a pixel value when performing the brightness adjustment, the pixel It is preferable to set using at least one of a parameter indicating a width from a value change start position to a change end and a parameter indicating the change amount of the pixel value.
By using such parameters, the degree of brightness adjustment by image processing can be set appropriately.

(5) The projector of the present invention projects a projection image from the plurality of projectors on 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 for use in a multi-projection system having an optical shading device set so that the brightness of a superimposing region is adjusted by a predetermined amount, wherein the brightness is adjusted by the optical shading device according to the brightness adjustment state. It is characterized by having an image processing apparatus capable of setting the degree of brightness adjustment of the superimposition region and performing brightness adjustment based on the set degree of brightness adjustment.
By using such a projector, the multi-projection system described in (1) can be configured.

(6) In the projector according to (5), the image processing device may set the degree of brightness adjustment of the superimposed region according to at least one of a pixel value and a spatial frequency of an image to be displayed. preferable.
Since the image processing apparatus of the projector has such a function, the same effect as that described in the multi-projection system (2) can be obtained.

(7) In the projector according to (5) or (6), it is preferable that the image processing device sets a degree of brightness adjustment of the overlapping region according to individual differences among the plurality of projectors.
Since the image processing apparatus of the projector has such a function, the same effect as that described in the multi-projection system (3) can be obtained.

(8) In the projector according to any one of (5) to (7), the brightness adjustment degree is a parameter indicating a change start position of a pixel value when the brightness adjustment is performed, and the pixel value It is preferable to set using at least one of a parameter indicating a width from a change start position to a change end and a parameter indicating the change amount of the pixel value.
Thereby, the effect similar to the effect described in the multi-projection system of said (4) can be acquired.

  (9) The brightness adjustment method for the overlapping area in the multi-projection system according to the present invention is such that the overlapping area is formed in a part of a projection image projected from an adjacent projector among the plurality of projectors. A method for adjusting the brightness of a superimposed region in a multi-projection system that projects a projected image of a plurality of images onto a screen, the light shielding device optically adjusting the brightness of the superimposed region, and adjusting the brightness of the superimposed region by image processing An image processing device for performing the setting, the optical shading device is set so that the brightness of the overlapping region is adjusted by a predetermined amount, and the superimposing region according to the brightness adjustment state by the optical shading device is set. The degree of brightness adjustment is set by the image processing apparatus.

  By adjusting the brightness of the overlapping region in the multi-projection system by such an adjustment method, the same effect as the effect described in the projection system of (1) can be obtained. Note that the brightness adjustment method for the overlapping region in the multi-multi-projection system described in (9) preferably has the same characteristics as the multi-projection system described in (2) to (4).

Hereinafter, embodiments of the present invention will be described.
The present invention basically adjusts the brightness of the overlapping region by combining an optical shading device using a shading plate and image processing. 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 in a large screen like a movie theater screen by installing a large number of projectors in the vertical and horizontal directions. In the embodiments described below, a multi-projection system in which two projectors PJ1 and PJ2 are arranged in the horizontal direction will be described as an example for the sake of simplicity.

  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 on which respective images are projected in a state where the overlapping region A is partly on the screen SCR, The configuration includes 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).

  As one of the functions, the information processing apparatus 100 includes an image processing apparatus 101 that can perform brightness adjustment of the overlapping region A by image processing. The specific configuration of the information processing apparatus 100 will be described later with reference to FIG.

  A procedure for adjusting the brightness in the multi-projection system according to the embodiment of the present invention will be briefly described. First, the brightness of the superimposed region is adjusted by the light shielding plates S1 and S2 to such an extent that the brightness of the entire projected image is smoothed as much as possible. The light shielding plates S1 and S2 are fixed at the positions. Then, the degree of brightness adjustment of the overlapping region is set by the image processing apparatus 101 according to the brightness adjustment state by the light shielding plates S1 and S2, and the brightness adjustment based on the set degree of brightness adjustment is performed by the image processing apparatus. 101. 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 adjusting the brightness of the superimposition region by such a procedure, the brightness adjustment by the light shielding plates S1 and S2 is only required to smooth the brightness of the entire projection image as much as possible. However, the setting of the light shielding plates S1 and S2 is possible. Note that “the degree to which the brightness of the entire projected image is smoothed as much as possible” means, for example, that the user who is not an expert (however, a user who has some degree of adjustment experience) can adjust the brightness of the entire projected image It is assumed that the level can be smoothed as much as possible.

  FIG. 2 is a diagram showing an example of adjusting the brightness of the overlapping region by the light shielding plates S1 and S2. At this stage, the positions of the light shielding plates S1 and S2 with respect to the projectors PJ1 and PJ2 are not set with high accuracy. The brightness of the projected image on the screen SCR is not smoothed, and the superimposed area A is visible. In such a state, brightness adjustment is performed by the image processing apparatus 101 of the information processing apparatus 100. The brightness adjustment by the image processing apparatus 101 (referred to as brightness adjustment by image processing) is performed with the positions of the light shielding plates S1 and S2 fixed.

  FIG. 3 is a diagram showing a case where brightness adjustment is performed by image processing in the state of FIG. By performing brightness adjustment by image processing, the brightness of the entire projected image is smoothed as shown in FIG. As shown in FIGS. 3B and 3C, the brightness adjustment by image processing is performed so that the brightness of the superimposition area A and the brightness of other areas are smoothed, as shown in FIGS. Control).

  As a parameter used for brightness adjustment by image processing, when changing (attenuating) a pixel value for brightness adjustment, a parameter indicating a change (attenuation) start position of the pixel value (referred to as an attenuation start position parameter), A parameter indicating the width from the change start position of the pixel value to the end of change (referred to as attenuation width parameter) and a change amount (attenuation amount) of the pixel value, that is, a parameter indicating how much the pixel value is changed (attenuation) (attenuation amount) Parameter). The degree of brightness adjustment can be set by at least one of these parameters, and brightness adjustment can be performed based on the set degree of brightness adjustment.

  For example, when the positions of the light shielding plates S1 and S2 are shifted, the position at which attenuation is started is controlled by the attenuation start position parameter, and if the light shielding amount by the light shielding plates S1 and S2 is insufficient, the attenuation width Control is performed to compensate for the shortage of the light shielding amount by the parameter or attenuation parameter.

  The attenuation width parameter and the attenuation amount parameter can be set according to the pixel value of the image data to be displayed. For example, for image data with a high pixel value, it is possible to set so as to enhance the attenuation effect by image processing, and for image data with a low pixel value for which the brightness adjustment effect by image processing cannot be obtained. In other words, it is possible to set so that the pixel value attenuation processing is not performed at all.

Based on this, if the brightness adjustment by the light shielding plates S1 and S2 is performed, the brightness adjustment by the light shielding plates S1 and S2 is performed only on at least one of an image having a low pixel value and an image having a high spatial frequency. It is also possible to do it. Originally, the brightness adjustment by the light shielding plates S1 and S2 can be appropriately adjusted for at least one of an image having a low pixel value and an image having a high spatial frequency, and the overlapping area A is not conspicuous. The effect to do is high.
For this reason, with respect to at least one of an image with a low pixel value and an image with a high spatial frequency, the strictness required for setting the position when installing the light shielding plates S1 and S2 is relatively small, and the skilled person Even a user who is not a user can install the light shielding plates S1 and S2 at appropriate positions if he / she gets used to some extent, and can appropriately adjust the brightness of the overlapping region.

  Therefore, in the multi-projection system of the present invention, it is possible to set the degree of brightness adjustment by image processing according to the characteristics of the image to be displayed in the state where the brightness adjustment by the light shielding plates S1 and S2 is performed. It is.

  For example, when the image to be displayed is an image having a high spatial frequency such as a natural landscape, it is sufficiently possible to make it difficult to visually recognize the overlapped area even with the brightness adjustment by the light shielding plates S1 and S2. For such an image, the brightness adjustment by the light shielding plates S1 and S2 is sufficient, and the degree of the brightness adjustment by the image processing is kept low or not performed at all. This is because, for an image with a high spatial frequency, if the brightness adjustment by image processing is performed in addition to the brightness adjustment by the light shielding plates S1 and S2, the pixel value is excessively attenuated. It is because it may be easy to visually recognize.

  In addition, when the image to be displayed is an image with a high pixel value and a low spatial frequency, such as an image with a full screen (for example, a presentation screen or a white snowy landscape), a light shielding plate Even if there is no deviation in the positions of S1, S2, etc., the overlapping area A is easily visible, so the degree of brightness adjustment by image processing is increased for such images.

  The determination of the characteristics of the image can be performed by analyzing the image to be displayed. Then, the degree of brightness adjustment by image processing is set based on the determination result of the characteristics of the image. At that time, the characteristics of each individual image, such as presentation images and natural scenery images, are uniformly determined, and the degree of brightness adjustment by image processing is set according to the determination result. Or a spatial frequency or the like is checked every predetermined time (for example, a time unit corresponding to one frame as the minimum time unit) in each image, and the brightness of the image is dynamically determined by image processing. There is a method of setting the degree of adjustment.

  The degree of brightness adjustment based on the image characteristic determination result can be performed by setting at least one of the attenuation start position parameter, the attenuation width parameter, and the attenuation amount parameter described above. Note that, as a method for setting the degree of brightness adjustment by image processing, for example, the user can also set empirically, but a captured image obtained by capturing the projection image of the screen SCR with an imaging device or the like Based on the data, it is also possible to acquire the brightness status of the superimposed area A and set the degree of brightness adjustment.

  Note that the information processing apparatus 100 side performs processing for analyzing image data to be displayed, determining characteristics of the image data, and setting the degree of brightness adjustment by image processing based on the determination result. Therefore, it is not necessary to add elements for performing these processes to the hardware and software of the projectors PJ1 and PJ2.

  In the multi-projection system according to the embodiment of the present invention, the degree of brightness adjustment by image processing can be set according to the individual difference of projectors used in the multi-projection system.

  That is, in the present situation, the projectors constituting the multi-projection system (in the example of FIG. 1, projectors PJ1 and PJ2) display with different performances. Individual differences among projectors are often caused by differences in the maximum illuminance due to differences in the performance of lamps used in the projectors PJ1 and PJ2, the spatial distribution of color unevenness among the projectors PJ1 and PJ2, and the like. If these are ignored, even if the brightness adjustment by the light shielding plates S1 and S2 is appropriately performed, the overlapping region A is easily visually recognized due to individual differences between the projectors PJ1 and PJ2.

  Based on these, the degree of brightness adjustment by image processing is set according to the individual difference between the projectors PJ1 and PJ2. Thereby, individual differences between the projectors PJ1 and PJ2 can be absorbed, and the effect of smoothing the projected image can be increased.

  In the example of FIG. 1, two projectors are included in the multi-projection system. However, when a large-scale multi-projection system using a large number of projectors PJ1, PJ2,. Are formed, but there are cases where the respective overlapping regions are visually recognized due to individual differences between the projectors PJ1, PJ2,. In such a case, each light shielding plate that adjusts the light amount of each overlapping region can be adjusted in brightness by image processing while being fixed at a predetermined position. Thereby, even in a large-scale multi-projection system using a large number of projectors PJ1, PJ2,..., It is possible to greatly reduce the labor required for adjusting the brightness of each light shielding plate.

  FIG. 4 is a block diagram showing the configuration of the multi-projection system according to the embodiment of the present invention. As shown in FIG. 4, the multi-projection system according to the embodiment of the present invention includes projectors PJ <b> 1 and PJ <b> 2 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 cut-out of partial images to be projected by the projectors PJ1 and PJ2 from the image data stored in the image data storage unit 102, and brightness of a superimposed region. An image processing apparatus 101 that performs various image processing such as image adjustment, an image display control unit 103 that performs various processes for image display such as a process of outputting image data processed by the image processing apparatus 101 to a corresponding projector, and an image An image analysis unit 104 that analyzes the contents of the image data stored in the data storage unit 102 and determines the characteristics of the image data, and analyzes the brightness of the superimposed region based on the captured image data captured by the imaging device 200 The captured image data analysis unit 105 is provided.

Note that the image analysis unit 104 and the captured image data analysis unit 105 in the imaging apparatus 200 and the information processing apparatus 100 can be provided as necessary. For example, the imaging device 200 and the captured image data analysis unit 105 are necessary when performing brightness adjustment by image processing based on captured image data obtained by capturing a projection image on the screen SCR. The image analysis unit 104 is necessary when performing brightness adjustment according to the characteristics of the image data to be displayed.
Since the multi-projection system according to Embodiment 1 has such a configuration, it is possible to perform brightness adjustment by the image processing described so far.

  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 case where the brightness adjustment by image processing is performed by the image processing apparatus 101 included in the information processing apparatus 100 is exemplified. However, the projectors PJ1 and PJ2 have the same image processing function as the image processing apparatus 101. May be performed on each projector PJ1, PJ2 side. In this case, image processing for brightness adjustment as described above is performed by the image processing apparatus 101 provided on each projector PJ1, PJ2 side.
In addition to the brightness adjustment process by the image processing apparatus 101, the image analysis process by the image analysis unit 104, the captured image data analysis process by the captured image data analysis unit 105, and the image display control unit, which have been performed on the information processing apparatus 100 side. It is also possible to provide each processing function such as image display control processing by 103 on each projector PJ1, PJ2 side so that each processing is performed on each projector PJ1, PJ2.

(2) 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.

  (3) 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.

  (4) 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 which shows the brightness adjustment example of the superimposition area | region by light-shielding plate S1, S2. The figure which shows the case where the brightness adjustment by image processing is performed in the state of FIG. 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 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 which shows an example of the brightness on a screen when the installation position of a light-shielding plate has shifted | deviated. The figure which shows an example of the brightness on the screen when the installation position of a projector has shifted | deviated. The figure which shows an example of the brightness on a screen in case the individual difference exists in a projector. The figure explaining the brightness adjustment by image processing with respect to image data with a low pixel value.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Information processing apparatus, 101 ... Image processing apparatus, 102 ... Image data storage part, 103 ... Image display control part, 104 ... Image analysis part, 105 ... Imaging data analysis part , 200: Imaging device, A: Overlapping region, PJ1, PJ2 ... Projector, S1, S2 ... Shading plate, SCR ... Screen

Claims (9)

A multi-projection system that 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 optical shading device set so that the brightness of the overlapping region is adjusted by a predetermined amount;
An image processing device that sets the degree of brightness adjustment of the superimposition region according to the brightness adjustment state by the optical light shielding device, and that can perform brightness adjustment based on the set degree of brightness adjustment;
A multi-projection system comprising: The multi-projection system according to claim 1.
The multi-projection system, wherein the image processing device sets a degree of brightness adjustment of the superimposed region in accordance with at least one of a pixel value and a spatial frequency of an image to be displayed. The multi-projection system according to claim 1 or 2,
The multi-projection system, wherein the image processing device sets a degree of brightness adjustment of the superimposition region according to individual differences among the plurality of projectors. In the multi-projection system in any one of Claims 1-3,
The degree of brightness adjustment indicates a parameter indicating a change start position of a pixel value when performing the brightness adjustment, a parameter indicating a width from the change start position of the pixel value to the end of change, and an amount of change of the pixel value. A multi-projection system, wherein the multi-projection system is set using at least one of parameters. 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,
It has an image processing device capable of setting the degree of brightness adjustment of the superimposition region according to the brightness adjustment state by the optical light shielding device and executing brightness adjustment based on the set degree of brightness adjustment. Characteristic projector. The projector according to claim 5, wherein
The projector according to claim 1, wherein the image processing device sets a degree of brightness adjustment of the superimposed region in accordance with at least one of a pixel value and a spatial frequency of an image to be displayed. The projector according to claim 5 or 6,
The projector according to claim 1, wherein the image processing device sets a degree of brightness adjustment of the superimposed region according to individual differences among the plurality of projectors. The projector according to any one of claims 5 to 7,
The degree of brightness adjustment indicates a parameter indicating a change start position of a pixel value when performing the brightness adjustment, a parameter indicating a width from the change start position of the pixel value to the end of change, and an amount of change of the pixel value. A projector that is set using at least one of parameters. Method for adjusting brightness of superposed region in multi-projection system for projecting projected images from a plurality of projectors onto a screen so that a superposed region is formed on a part of a projected image projected from an adjacent projector among a plurality of projectors Because
An optical shading device that optically adjusts the brightness of the superimposed region; and an image processing device that performs brightness adjustment of the superimposed region by image processing;
Setting the optical shading device so that the brightness of the overlapping region is adjusted by a predetermined amount;
A method for adjusting the brightness of a superimposed region in a multi-projection system, wherein the image processing device sets a degree of brightness adjustment of the superimposed region in accordance with a brightness adjustment state by the optical shading device.