JP2000350230A - Image projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate adjustment of projectors by easily picking up an image projected on a screen without burdening a user when a large screen is displayed by using plural projectors. SOLUTION: This image projection system which projects a large image by connecting projection images of plural projectors on the screen has an image pickup part 130 which picks up a reference image projected on the screen 170 by a digital camera, a joint part 120 which positions and fits the image pickup part 130 to a projector part 110, an image storage part 140 equipped with a frame memory which stores the image picked up by the image pickup part 130, and a variation correction processing part 150 equipped with a correcting circuit and a look-up table for correcting the variation of picked-up image data generated depending upon the relative position relation between the projector part 110 and image pickup part 130.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image projection system, and more particularly, to an image projection system for projecting a large image by connecting images of a plurality of projectors on a screen.

[0002]

2. Description of the Related Art Conventionally, an image projection system for displaying a large screen by arranging a plurality of rear projection displays has been used. In a rear projection display, a transmission screen is used, and a projector projects an image on a surface opposite to a surface viewed by an observer. On the other hand, an image projection system that performs projection from a plurality of projectors on a large reflective screen and displays a large screen is also used.

In this type of image projection system, since a large screen is formed by combining a plurality of projection images, it is first necessary to correct the distortion of each projection image. For this purpose, there have been proposed a method of adjusting a projector projection angle so that distortion is not generated in a projected image, and a method of giving distortion to cancel distortion generated after projection to an original image in advance. Each of these methods requires a means for detecting distortion information of a projected image, and a method using a digital camera or a sensor arranged on a screen has been proposed as this detecting means.

[0004] Secondly, a technique is required in which the projection images are stuck together. For this purpose, a technique is disclosed in which overlapping areas are provided and a plurality of images are connected smoothly. In this method, means for detecting information of an overlapping area is required, and parameters are extracted from an image captured by a digital camera. Third, it is necessary to perform color correction on each projected image, and a method is disclosed in which the entire bonded reference projected image is captured by a digital camera, parameters are extracted from the captured image, and the color correction of each projected image is performed. ing.

[0005] The operation of obtaining the parameters for performing these series of corrections is called calibration. It is necessary to perform the calibration when the image projection system is installed and when the influence due to the change over time occurs.

In a rear projection type display, a method of embedding a sensor in a screen, a method of capturing a projected image by photographing with a TV camera or a digital camera from a side opposite to a viewing surface of the screen, and correcting the captured image data for correction. A method of extracting parameters is also used.

[0007]

As described above, in an image projection system for projecting a large screen by using a plurality of projectors, it is necessary to capture an image projected on a screen in order to adjust each projector. However, since a digital camera that captures a projected image and a projector that projects an image are separated, it takes a lot of time to adjust the installation position, angle, focus, and the like of the digital camera. Therefore, it has been extremely difficult for a general user to optimally adjust this type of image projection system.

Further, in the rear projection type display, it is difficult to secure a sufficient distance between the digital camera and the screen when taking a projected image with the digital camera from the side opposite to the projection surface. For this reason, there is a problem that it is difficult to photograph the entire screen. However, the above-described adjustment work is required for photographing from the viewing surface side, which imposes a burden on the user. In addition, it is difficult for the method of embedding the sensor in the screen to cope with all three types of correction parameter extraction.

The present invention has been made in consideration of the above circumstances, and an object thereof is to display a large screen using a plurality of projectors without imposing a burden on a user. It is an object of the present invention to provide an image projection system that can easily capture an image projected on a screen and contribute to facilitating adjustment work of a projector.

[0010]

(Structure) In order to solve the above-mentioned problem, the present invention employs the following structure.
That is, the present invention relates to an image projection system for projecting a large image by connecting projection images of a plurality of projectors on a screen, wherein an image capturing means for capturing a reference image projected on the screen,
Mounting means for positioning and mounting to the projector or screen, image storage means for storing an image captured by the image capturing means, and a variation in captured image data caused by a relative positional relationship between the projector and the image capturing means. And a variation correcting means for correcting.

Here, preferred embodiments of the present invention include the following. (1) The image capturing means is a line sensor attached to a screen and scanned on the screen, and the projector unit and the screen are joined by a joining member.

(1-1) To have a mirror for reflecting a projected image to be projected on the screen and leading it to the line sensor. (1-2) A marker is provided at a predetermined position on the screen, and a photoelectric conversion element for detecting the position of the marker is provided on a support member of the line sensor. (1-3) A screen is scanned by a line sensor a plurality of times, and image data obtained by each scan is averaged.

(1-4) a means for storing a line sensor support and a guide rail such that the light receiving surface of the line sensor always faces the screen surface, and for storing information on the curvature of the screen;
Means for detecting the position of the line sensor, and means for correcting the value detected by the line sensor based on the curvature information of the screen and the position information of the line sensor. (1-5) The screen is curved, a linear guide rail attached to the curved screen, a telescopic support attached to the linear guide rail, and a non-volatile memory for storing the curvature information of the screen. Having

(2) The image capturing means is a digital camera which is fixed to the projector section and electronically captures a reference image projected on the screen, and which stores data indicating a positional relationship between the projector section and the digital camera. Having

(2-1) The digital camera has a zoom function, and captures and stores the center of the screen and the entire screen. (2-2) Provision of means for linking the lens of the projector and the focus adjustment of the digital camera. (2-3) A half mirror that guides the light from the light source of the projector to the digital camera without reflecting or transmitting the light.

(2-4) The projection image of the projector is divided into a plurality of regions for photographing, and each of the divided regions is photographed by changing the direction with a plurality of digital cameras or one digital camera. A means for attaching a plurality of images together to support the addition of projectors. (2-5) A mirror that reflects the projected image to be projected on the screen and guides it to the digital camera.

(Operation) According to the present invention, the reference image projected by the projector is captured by the image capturing means and stored in the image storage means. Prior to the extraction of the three types of image correction parameters, the variation correction unit corrects an error in the captured image due to a change in the relative position between the projector unit or the screen and the image capturing unit. Therefore, the user does not need to adjust the relative position and angle between the image capturing means and the screen, and the convenience is improved.

In the configuration (1), a line sensor is used as an image capturing means, and the line sensor is scanned on a screen, so that an image projected on the entire screen is captured. There is no need to secure the distance from the screen.

In (1-1), by providing a mirror for guiding a projection image to be projected on the screen to the line sensor,
The device can be downsized. Here, when the projection surface of the screen is scanned by the line sensor, it is impossible to scan the screen surface because a shadow of the line sensor occurs. There is a method of directly receiving light from the projector, but since the focus is adjusted to the screen surface, the focus is shifted by the distance between the screen and the light receiving surface of the line sensor. Therefore, by using a mirror as in (1-1), it is also possible to focus on the light receiving surface of the line sensor, eliminating the need to attach image capturing means to the viewing surface of the screen, and miniaturizing the device. Is peeled off.

In (1-2), a light-emitting element and a light-receiving element are used as photoelectric conversion elements, and the light-emitting element repeatedly emits light with the movement of the line sensor. The position of the above line sensor can be accurately grasped. (1-3)
By averaging image data obtained by a plurality of scans of the screen by the line sensor, the accuracy of the extracted parameters is improved.

In (1-4), the curvature information of the screen is stored, and the image data obtained by the line sensor is corrected based on the curvature information and the position information of the line sensor, thereby obtaining the curved screen. In this case, data equivalent to image data captured by a digital camera from a position distant from the screen can be obtained. In (1-5), by attaching a telescopic support to the linear guide rail and having a non-volatile memory for storing the curvature information of the screen, even in the case of a curved screen, digitally from a position away from the screen Data equivalent to image data captured by the camera is obtained.

In the configuration (2), the digital camera as the image capturing means is connected to the projector, and the storage means for holding data indicating the positional relationship between the projector and the digital camera is provided. It is not necessary to adjust the position of the digital camera at the time.

In (2-1), the digital camera is provided with a zoom function, and the center of the screen and the entire screen are photographed, thereby improving the accuracy of the extraction parameters for image stitching. In (2-2), by linking the focus adjustment of the digital camera with the lens of the projector, it is not necessary to adjust the focus of the digital camera, and the convenience is improved. In (2-3), by providing a half mirror for guiding the light from the light source of the projector to the digital camera, it is possible to capture the reference projection image into the digital camera without a screen.

In (2-4), each of the divided areas of the projected image is photographed by changing the direction with a plurality of digital cameras or a single digital camera, and the photographed images are stuck together. Can be photographed on the entire screen even when the image is further enlarged to provide a larger screen image. In (2-5), by providing a mirror that reflects a projection image to be projected on the screen and guides the digital image to the digital camera, the digital camera can be built in a thin housing.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
1 is a block diagram illustrating a basic configuration of an image projection system according to an embodiment. This system includes an image projection device 10
This is an example in which the screen 170 is separated from 0.

In the image projection apparatus 100, the projector section 110 is composed of a plurality of projectors, and obtains one image by synthesizing images from each projector on the screen 170. The image capturing unit 13 is connected to the projector
0 is joined. As the joining part 120, for example, a mechanism that joins to a steel material via a screw or a movable part can be considered. The image capturing unit 130 includes a digital camera or the like that electronically captures a projected image on the screen 170, and captures a reference image on the screen 170.

The image storage unit 140 includes the image capturing unit 13
0 and a signal line, and stores a reference image captured by the image capturing unit 130. The variation correction processing unit 150 is connected to the image storage unit 140 via a signal line, and corrects variation in image data based on the reference image stored in the image storage unit 140. That is, the variation of the image data caused by the relative positional relationship between the projector unit 110 and the image capturing unit 130 is corrected.

FIG. 2 shows a more detailed block diagram of the variation correction processing section 150 and the image storage section 140. The variation correction processing unit 150 includes a correction circuit 151 and a flash memory 152.
Stores a parameter for specifying a joint state between the projector unit 110 and the image capturing unit 130 as a variation correction lookup table 153.
Further, the image storage unit 140 includes a frame memory 141. Further, the frame memory 141 and the correction circuit 151, and the correction circuit 151 and the flash memory 1
52 are connected by signal lines, respectively.

Next, the operation of the present embodiment will be described. The reference image projected by projector unit 110 for adjustment of each projector of projector unit 110 is projected on screen 170, and the reference image projected on screen 170 is captured by image capturing unit 130. Then, the image data is converted into digital image data and stored in the frame memory 141 of the image storage unit 140. The correction circuit 151 of the variation correction processing unit 150 reads data from the frame memory 141 of the image storage unit 140, adds correction to the image data while referring to the lookup table 153, and outputs corrected image data.

In the look-up table 153, the optimum correction values are tabulated based on the relationship between the image capturing unit 130 and the projector unit 110, so that the corrected image data is converted into an image actually projected on the screen 170. It will be very close. Then, by performing various adjustments of each projector of the projector unit 110 based on the corrected image data, it becomes possible to display a single large image by accurately combining a plurality of images.

As described above, according to the present embodiment, the reference image displayed on the screen 170 is
By correcting the image data with the variation correction processing unit 150, it is possible to easily capture a reference image for various adjustments of the projector. In other words, there is no need for the user to adjust the relative position and angle between the image capturing unit 130 and the screen 170, and various adjustment operations can be easily performed without imposing a burden on the user. Is big.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
1 is a block diagram illustrating a basic configuration of an image projection system according to an embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

This embodiment is different from the first embodiment described above in that the projector unit and the screen are integrated. 3 (a) and 3 (b) are of a rear projection type. FIG. 3 (a) is a configuration in which an image is captured from the viewing surface of a screen 170, and FIG.
In this configuration, an image is taken in from the projection plane 0.

The variation correction processing unit 1 in the present embodiment
The configuration of reference numeral 50 is the same as that of FIG. 2, but the variation correction lookup table 153 is data corresponding to each configuration.

Even in such a configuration, since the image capturing unit 130 is fixed to the projector unit 110 by the joining unit 120 and the positional relationship between the image capturing unit 130 and the screen 170 is predetermined, the screen 170
Image data that is close to the reference image actually projected on the target image. Therefore, effects similar to those of the first embodiment can be obtained.

Third Embodiment Next, an image projection system according to a third embodiment of the present invention will be described with reference to FIGS. This embodiment is an example of a rear projection type multi-display device.

As shown in FIG. 4, four projectors 2
01 (one of which is omitted in the figure) is fixed to the back plate 200 and the mirror 205 corresponding to each projector 201
Reflects light rays emitted from the projector 201,
The position and the angle are determined so that the image is projected on the screen 202, and the image is attached to the back plate 200. Guide rails 204 are attached to the top and bottom of the screen 202, and the line sensor support 203 is held by the guide rails 204. Further, a drive mechanism 211 is built in the line sensor support 203.

FIG. 5 is a diagram showing the line sensor support 203 from the top of the apparatus. A line sensor 206 is mounted inside the line sensor support 203. Each photoelectric conversion element of the line sensor 206 is arranged in a direction perpendicular to the paper surface.

Next, the operation of the present embodiment will be described. FIG.
The line sensor support 203 scans the screen 202, the line sensor 206 captures the luminance of the vertical line of the projected image on the screen 202 for each RGB, and after A / D conversion, the frame memory of the image storage unit 140 in FIG. 1
Take it into 41. The correction circuit 151 of the variation correction processing unit 150 adjusts the image data in the frame memory 141 so that the projected reference image is equivalent to the image data obtained by directly facing the digital camera away from the screen. The correction is performed with reference to the variation correction processing lookup table 153.

As a method of capturing luminance information of the screen 202 by the line sensor 206, R, G, and B are used.
A method of switching the filter every time and scanning three times;
There is a method of simultaneously scanning three line sensors, each having a filter attached for each of G, B and B.

Also in this embodiment, the line sensor 20
The reference image close to the image actually projected on the screen 170 can be captured by performing correction on the image data sequentially detected in step 6 and stored in the frame memory 141 with reference to the look-up table 153. . The same effects as in the first embodiment can be obtained.

(Fourth Embodiment) Next, an image projection system according to a fourth embodiment of the present invention will be described with reference to FIGS. This embodiment is also an example of a rear projection type multi-display device.

As shown in FIG. 6, the line sensor support 2
03 scans the inside of the screen 202, that is, the projection plane. Further, the line sensor support 20
As shown in FIG. 7, a mirror 207 for reflecting the reflected light from the mirror 205 again and guiding the reflected light to the line sensor 206 is mounted inside the mirror 3.

Although the projector 201 is focused on the screen surface, the positional relationship between the mirror 207, the line sensor 206 and the screen 202 is adjusted so that the focus is also on the line sensor 206. When the light from the projector 201 is directly received by the line sensor 206, the focus is shifted by the distance between the light receiving surface of the line sensor 206 and the projection surface of the screen 202.
The focus can also be adjusted on the light-receiving surface 06.

Also in this embodiment, the line sensor 20
By performing correction on the image data sequentially detected and stored in step 6, a reference image close to the actually projected image can be captured, and the same effect as in the first embodiment can be obtained.

(Fifth Embodiment) Next, an image projection system according to a fifth embodiment of the present invention will be described with reference to FIG. This embodiment is also an example of a rear projection type multi-display device.

The basic structure is the same as that of FIG.
In the present embodiment, in addition, as shown in FIG. 8, markers 209 such as black rectangular labels are attached at equal intervals to an area that does not cause an obstacle when an image is projected on the screen 202. A light emitting element 208 for irradiating the marker 209 with light is provided on the line sensor support 203.
And a light receiving element 212 for receiving the reflected light from the marker 209.

In this embodiment, the line sensor support 20
The reflected light of the light emitted by the light emitting element 208 attached to the light receiving element 212 is received by the light receiving element 212, the change in the intensity of the light is counted, and the screen 20
2. Accurately grasp the position on the screen. Further, a method of converting the position information into a barcode and using the barcode as a marker is also conceivable.

With such a configuration, the same effect as that of the first embodiment can be obtained, and the position of the line sensor 206 can be accurately measured, so that a more accurate reference image can be captured. Becomes

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described in detail with reference to FIG. The present embodiment is an improvement of the variation correction processing unit 150 and the image storage unit 140, and the same parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

R detected by the line sensor 206
The GB light signal is converted into an electric signal, further sampled, and converted into digital data. At this time, the screen is scanned a plurality of times by the line sensor, and a plurality of frame memories 141 are provided to store image data in each scan. The correction circuit 151 calculates average image data with reference to the plurality of image data, and outputs highly accurate corrected image data with reference to the variation correction lookup table 153.

(Seventh Embodiment) Next, an image projection system according to a seventh embodiment of the present invention will be described with reference to FIGS.
1 will be described. This embodiment is an improvement of the third embodiment, and is an example in which the screen 202 is curved.

The guide rail 204 is attached along the curve of the screen 202 as shown in FIG. As a result, the line sensor support 203 is
As shown in (a) and (b), the screen 202 moves along the curvature of the screen 202.

In such a configuration, the line sensor 2
The image data captured at 06 and stored in the frame memory 141 or the like differs at the screen edge from the image data captured by the digital camera. The generated difference is corrected by the correction circuit 151 with reference to the screen curvature information stored in the variation correction lookup table 153. As a result, the same image data as obtained by the digital camera is obtained, and the same effect as in the first embodiment is obtained.

(Eighth Embodiment) Next, an image projection system according to an eighth embodiment of the present invention will be described with reference to FIGS.
3 will be described. This embodiment is also an improvement of the third embodiment, and is an example in which the screen 202 is curved.

As shown in FIG. 12, a straight guide rail 204 is attached to a curved screen 202. A support rod 213 and a gear 214 are attached to the line sensor support 203 as telescopic supports. A line sensor 206 is attached to the tip of the support bar 213. Although not shown in the figure, a stepping motor is attached to the gear 214 so that the rotation amount can be controlled.

The line sensor support 203 is provided as shown in FIG.
(A) As shown in (b), the line sensor 206 and the screen 202 are moved by moving the support rod 213 at the same time by moving the end of the screen 202 from one end to the other at the shortest distance.
And keep the distance constant. As a method of keeping the distance constant, a method of dynamically measuring the distance between the line sensor 206 and the screen 202 using an ultrasonic sensor or an optical sensor and adjusting the extension amount of the support rod 213 based on the measurement data. Alternatively, there is a method in which the curvature information of the screen 202 is held in a non-volatile memory in advance, and the feeding amount of the support rod 213 is adjusted based on the data.

In this embodiment, similarly to the seventh embodiment, the line sensor 206 is connected to the curved screen 2.
02 along the screen 202
The image projected on the image can be detected satisfactorily. Then, by correcting the obtained image data based on the screen curvature information, the same image data as that obtained by the digital camera is obtained, and the same effect as in the seventh embodiment is obtained.

(Ninth Embodiment) Next, a ninth embodiment of the present invention will be described in detail with reference to FIGS.
In the present embodiment, the projector unit and the screen are provided separately, and the projection system may be either a rear projection system or a front projection system.

FIG. 14 shows a bottom plate 3 supported by a support 366.
62, two projectors 361 are installed on the middle plate 363, respectively. A digital camera 365 is attached to the upper plate 364. FIG.
(A) and (b) show the positional relationship between the projector 361 and the digital camera 365 and the screen 367, where (a) is a view from the side and (b) is a view from above.

From the projector 361 to the screen 367
Is captured by the digital camera 365 and stored in a frame memory inside the digital camera. The digital camera 365 incorporates another flash memory in addition to the frame memory. Then, in this flash memory, in addition to information on angles α1 and α2 formed by the optical axis of the projector 361 and the optical axis of the digital camera 365 in the vertical direction and information on angles β1 and β2 formed by the horizontal direction, two other projectors Information (α3, α4, β3, β4) is also stored.

The image taken by the digital camera 365 is corrected based on the information of α1 to α4 and β1 to β4, and the image obtained by the digital camera 365 always faces the screen (the optical axis is the screen angle). (Equivalent to the direction of the line vector). For example,
When the optical axes of both the projector 361 and the digital camera 365 are not perpendicular to the screen 367, the image distortion due to the inclination of the optical axis of the digital camera 365 is corrected.

In this way, the reference image projected on the screen 367 can always be satisfactorily captured by the digital camera 365.
By performing the various adjustments described above, a single large image can be displayed by combining a plurality of images with high accuracy. Therefore, the same effect as in the first embodiment can be obtained. In addition, there is an advantage that the position adjustment of the digital camera at the time of performing the calibration becomes unnecessary.

(Tenth Embodiment) Next, the first embodiment of the present invention will be described.
The embodiment 0 will be described in detail with reference to FIG. Here, the configuration on the device side is not shown in the figure, but may be, for example, a configuration as shown in FIG. 14 of the ninth embodiment.

FIG. 16 shows that four images 391 are projected using four projectors. The digital camera (not shown) has a lens configuration that allows a plurality of focal lengths to be selected. The digital camera photographs a central area 392 during zooming (long focal length), and photographs a wide area 393 at a short focal length. The image of the central region 392 is used for extracting the image stitching correction parameter, and the wide region 393 is used for extracting the image distortion correction parameter based on the projection angle. As a result, the accuracy of the extraction parameter for image stitching is improved.

(Eleventh Embodiment) Next, the first embodiment of the present invention will be described.
The details of the first embodiment will be described with reference to FIG. In this embodiment, the lens of the projector and the focus adjustment of the digital camera are linked.

A roller 433 is brought into close contact with a focus ring 432 of a lens 431 of the projector 430, and an encoder 434 is attached to the roller 433 via a rotation shaft 442. The encoder 434 is connected to the signal line 4
It is connected to the control circuit 440 in the digital camera 435 via the connection 41. Further, the control circuit 440 connects the stepping motor 43 via the signal line 443.
9 is connected. The stepping motor 439 includes
A roller 438 is attached via a rotation shaft 444. The roller 438 is a lens 4 of the digital camera 435.
It is in close contact with 36 focus rings 437.

In such a configuration, the rotation amount of the stepping motor 439 is controlled according to the rotation amount of the focus ring 432 of the projector 430. As a result, when the focus of the lens 431 of the projector 430 is adjusted, the focus of the lens 436 of the digital camera 435 is also automatically adjusted. That is, it is not necessary to adjust the focus of the digital camera 435, and the convenience is improved.

(Twelfth Embodiment) Next, the first embodiment of the present invention will be described.
The second embodiment will be described in detail with reference to FIG. In this embodiment, light from a projector, not a projected image on a screen, is directly input to a digital camera.

The light emitted from the projector 401 is partially reflected by the half mirror 403 and projected onto a screen (not shown), but a part of the light is transmitted and guided to the digital camera 402. Digital camera 40
2, a projector 401 and a half mirror 40
Information such as the positional relationship 3 and the transmittance of the half mirror 403, the distance to the screen, and the like are held, and correction is performed on an image captured based on the information (a reference image captured through the half mirror). Add.

In the present embodiment, it is possible to capture a reference image without a screen. Since we are not capturing the actual image projected on the screen, we cannot make all adjustments of the projector based on this,
It is possible to make adjustments such as color correction.

(Thirteenth Embodiment) Next, the first embodiment of the present invention will be described.
Details of the third embodiment will be described with reference to FIGS. 19 and 20. This embodiment is an example in which a reference image on a screen is captured by a plurality of digital cameras.

As shown in FIG. 19, the image projection device
Projectors 411 and two digital cameras 412
Is installed. FIG. 20 shows a reference image 421 projected from each projector 411. These images 42
1 is projected by two digital cameras 412 by dividing the screen area into two. An image captured by each digital camera 412 is indicated by 422 in FIG.

The overlapping portion of the two images 422 is aligned by using, for example, an image bonding technique disclosed in Japanese Patent Application Laid-Open No. 6-141246.
What is necessary is just to analyze the stuck image and extract the correction parameters. In this case, there is also a method of capturing two images using one digital camera having one head drive mechanism.

In this embodiment, each of the divided areas of the projection image is photographed by changing the direction with a plurality of digital cameras 412 or one digital camera, and the photographed images are attached to each other. Can be photographed on the entire screen even when the image is further enlarged to provide a larger screen image.

(Fourteenth Embodiment) Next, the first embodiment of the present invention will be described.
Details of the fourth embodiment will be described with reference to FIG. The present embodiment is an example of a rear projection type multi-display device.

As in the third embodiment (FIG. 4) described above, four projectors 201 (one of which is omitted in the figure) are fixed to the back plate 200, and each projector 201
The mirror 205 corresponding to 01 reflects the light beam emitted from the projector 201 and is attached to the back plate 200 at a position and an angle determined so that an image is projected on the screen 452. A digital camera 451 is installed on the rear panel 200, and the reference image projected on the screen 202 is guided to the digital camera 451 by the mirror 450.

With such a configuration, an optical path can be gained by using the mirror 450, and a digital camera for capturing a projected image on a screen can be built in a thin housing.

The present invention is not limited to the above embodiments. In the present invention, since there is a function to capture an image projected on the screen, it is possible to realize a hard copy in combination with a printing function. In addition, the digital camera can be used as an image capturing unit for a hard copy of an overlay image of a character written on a whiteboard and a projected image on a screen.

Further, the present invention can be used as a device for reading a point pressed when a touch panel function is added to a screen. It is also effective to use such a digital camera for adding value to the image projection system as an image capturing device at the time of calibration. In addition, without departing from the gist of the present invention,
Various modifications can be made.

[0082]

As described above in detail, according to the present invention, the image capturing means for capturing the reference image projected on the screen is positioned and attached to the projector unit or the screen, and the reference image captured by the image capturing means is transferred to the image capturing means. By performing correction based on the relative positional relationship between the projector unit and the image capturing means, image data close to the image actually projected on the screen can be obtained. Therefore, when a large screen is displayed using a plurality of projectors, the image projected on the screen can be easily captured without imposing a burden on the user, contributing to easy adjustment work of the projector. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an image projection system according to a first embodiment.

FIG. 2 is a more detailed block diagram of a variation correction processing unit and an image storage unit.

FIG. 3 is a block diagram showing a basic configuration of an image projection system according to a second embodiment.

FIG. 4 is a perspective view showing a basic configuration of a rear projection type multi-display device according to a third embodiment.

FIG. 5 is a plan view showing the configuration of a line sensor support when the apparatus of FIG. 4 is viewed from above.

FIG. 6 is a perspective view showing a basic configuration of a rear projection type multi-display device according to a fourth embodiment.

FIG. 7 is a plan view showing the configuration of a line sensor support when the apparatus of FIG. 5 is viewed from above.

FIG. 8 is a perspective view showing a basic configuration of a rear projection type multi-display device according to a fifth embodiment.

FIG. 9 is a block diagram showing a main configuration of an image projection system according to a sixth embodiment.

FIG. 10 is a perspective view showing a basic configuration of a rear projection type multi-display device according to a seventh embodiment.

FIG. 11 is a schematic diagram showing the shape of a guide rail and the movement of a line sensor support according to a seventh embodiment.

FIG. 12 is a perspective view showing a basic configuration of a rear projection type multi-display apparatus according to an eighth embodiment.

FIG. 13 is a schematic diagram showing the shape of a guide rail and the movement of a line sensor support in the eighth embodiment.

FIG. 14 is a perspective view showing a basic configuration of an image projection system according to a ninth embodiment.

FIG. 15 is a schematic diagram illustrating an arrangement relationship between a projector and a screen according to a ninth embodiment.

FIG. 16 is a schematic diagram showing each image area on a screen according to the tenth embodiment.

FIG. 17 is a block diagram showing a basic configuration of an image projection system according to an eleventh embodiment.

FIG. 18 is a perspective view showing a basic configuration of an image projection system according to a twelfth embodiment.

FIG. 19 is a perspective view showing a basic configuration of an image projection system according to a thirteenth embodiment.

FIG. 20 is a schematic diagram showing image areas on a screen according to a thirteenth embodiment.

FIG. 21 is a perspective view showing a basic configuration of an image projection system according to a fourteenth embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 image projection device 110 projector unit 120 joining unit 130 image capturing unit 140 image storage unit 141 frame memory 150 variation correction processing unit 151 correction circuit 152 flash memory 153 lookup table 170 screen Reference numeral 200: Back plate 201: Projector 202: Screen 203: Line sensor support 204: Guide rail 205: Mirror 206: Line sensor 207: Mirror 208: Light emitting element 209: Marker 211: Drive mechanism 212: Light receiving element

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Hashiya 2-43-2, Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Fujio Kosaka 2-43-2, Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Ryoichi Sawaki 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Masaki Higurashi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Within Olympus Optical Co., Ltd. (72) Inventor Yukihiro Sugimoto 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Tomoyuki Nakamura 2-43-2, Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Akihiro Kubota 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olimpa Within Optical Industry Co., Ltd. (72) Inventor Susumu Kobayashi F-term within Olympus Optical Co., Ltd. 2-43-2 Hatagaya, Shibuya-ku, Tokyo 5C058 AA00 BA23 BA27 BA35 BB13 BB14 BB25 EA01 EA02 EA21 EA41 5C060 EA01 GA01 GA02 GB02 GB07 GD04 HB26 JA00 JB06 5C094 AA02 AA14 AA41 AA48 AA55 AA56 AA60 BA16 DA01 ED20 FA01 HA10 5G435 AA19 BB17 DD02 DD05 DD06 DD07 DD10 EE25 FF00 FF12 GG46 LL15

Claims (3)

[Claims] 1. An image projection system for projecting a large image by connecting projected images of a plurality of projectors on a screen, comprising: an image capturing means for capturing a reference image projected on the screen; Mounting means for positioning and mounting to a projector section or a screen comprising a plurality of projectors; image storage means for storing an image captured by the image capturing means; and a relative positional relationship between the projector section and the image capturing means. An image projection system comprising: a variation correction unit configured to correct variation in captured image data. 2. The image capturing device according to claim 1, wherein the image capturing means is a line sensor attached to the screen and scanned on the screen, and the projector unit and the screen are joined by a joining member. Image projection system. 3. The image capturing means is a digital camera fixed to the projector unit for electronically capturing a reference image projected on the screen, and holds data indicating a positional relationship between the projector unit and the digital camera. 2. The image projection system according to claim 1, further comprising storage means for performing the operation.