JP2009223231A - Projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection system capable of projecting a projection image which is reduced in deterioration of the image. <P>SOLUTION: An imaging surface of a screen 2 is made surface symmetry, and imaging parts 4 and 5 are arranged while putting a projection part 3 in between as shown by Fig.1 and Fig.2 so that the imaging parts 4 and 5 may not include a symmetric position of a light source of the projection part 3 in their imaging ranges, and perform photography obliquely to each other in terms of imaging range. The imaging parts 4 and 5 perform photography by overlapping the center (a) of a projection range in terms of imaging range, and are arranged so that a hot spot 1 may not be reflected in the imaging parts 4 and 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection system that captures an image of a projection range using an imaging unit, and more particularly, to a projection system that obtains an image without reflection of hot spots on the imaging unit.

A projection system that combines a projector and a camera and uses the image information captured from the camera to perform focusing and keystone correction has been proposed. Furthermore, as an advanced application example, writing is performed with a marker pen on the screen surface, and the written image is photographed and projected on the projected image, or the locus of the laser pointer is superimposed on the original projected image as an image. Utilization methods such as display are also proposed. However, if you try to shoot the projection range with the camera while projecting an image from the projector, the image will be captured correctly because the hot spot is reflected and the area that overlaps the hot spot will be overexposed. Can not. A hot spot is a phenomenon in which a light source image of a lamp of a projector is reflected and only that portion becomes high brightness.
Therefore, as means for avoiding the reflection of the hot spot, as shown in FIG. 15, the projection lens of the projector 53 is assumed at a position having the projection plane (screen) 51 as a symmetry plane, and the assumed projection lens is taken in the imaging range. It is conceivable to arrange the projector 53, the camera 52, and the screen 51 so that they are not included. Patent Document 1 describes that “the imaging lens of the imaging unit is disposed outside the direct reflection region of the light of the projected image”, which means the same thing.
In the case of rear projection, depending on the selection of the screen, even if the hot spot is not visible or slightly visible when viewed from the user's side, it will not be a problem, and it will hardly matter. It can be suppressed to a level that does not become. However, it reflects on the back surface of a transparent plate (acrylic plate or glass plate) for holding the screen, and a hot spot appears in the imaging range. As shown in FIG. 16A, in the case of launch projection that is shifted and projected, the incident angle of the upper corner portion becomes large. However, as shown in FIG. 16B, if the projection optical axis can be arranged perpendicularly (orthogonally) to the center of the screen, the optical path can be shortened even if the peripheral portion has the same maximum incident angle. However, in the method of Patent Document 1, it is necessary to arrange the camera greatly, and there is a possibility that the entire shooting range may not be within the depth of field.

As a conventional technique, Patent Document 1 discloses a projection system in which an imaging lens of an imaging unit is disposed outside a direct reflection region of a projection image, thereby avoiding reflection of a hot spot in an image when the projection range is captured. Yes.
Further, in Patent Document 2, a screen that can be controlled in a time-sharing manner in a scattering state during a projection display period and a transmission state during a photographing period is used. In addition, a display imaging device is disclosed in which a time-division control is performed to provide a light source of a projection display means, a high-luminance light-emitting portion such as a light emitter, and a mask that prevents projected images from reaching the screen.
Further, Patent Document 3 discloses a configuration having a blocking unit that blocks the projection light output from the projection unit.
Japanese Patent No. 3736350 Japanese Patent Laid-Open No. 06-269002 JP 2003-143348 A

However, the prior art of Patent Document 1 has a problem that the degree of freedom of projector, camera, and screen arrangement is reduced.
The prior art of Patent Document 2 relates to capturing of a projected image, and prevents the occurrence of a screen hot spot in a conference system. A special function must be added to the screen, and the cost of the apparatus is reduced. There is a problem that becomes high.
Further, the prior art of Patent Document 3 has a problem that the projection is interrupted at the time of shooting because it has a blocking means for blocking the projection light output from the projection means at the time of shooting.
The present invention has been made in view of such problems, and in order to correct image deterioration due to hot spots included in an image projected by the projection unit, the imaging unit is used as a light source when photographing with a plurality of imaging units. The image reflection position moves to a position shifted from each other so that the image is partially overlapped, and the reflection of the light source image on each captured image occurs at a different position with respect to the projected image. It is an object of the present invention to provide a projection system capable of generating a projection image with reduced image degradation by disposing the projection system in the position.

In order to solve such a problem, the present invention provides an image projecting unit that projects an image, an image capturing unit moving unit that moves the position of the image capturing unit, and an image capturing unit that moves the image capturing unit. By moving the reflected position of the light source image by the image projecting means within the imaging range to a position shifted from each other, the entire projected image is imaged by partially overlapping, and the imaged by the imaging means And processing means for performing predetermined processing on the image data.
According to a second aspect of the present invention, when determining the angle of view and the angle of the imaging unit, the plurality of imaging units are arranged at positions where the respective imaging ranges overlap at the maximum angle of view and at the closest projection distance. And
According to a third aspect of the present invention, the processing unit adjusts an overlapping portion of the images captured by the imaging unit and combines them into one image data, and corrects image distortion due to an angle of view.

According to a fourth aspect of the present invention, an image projecting unit that projects an image onto a projection surface, a plurality of image capturing units that capture the entire image projected by the image projecting unit so as to partially overlap, and an image captured by the image capturing unit Processing means for performing predetermined processing on each image data, and the plurality of image pickup means reflect the light source image on each picked-up image at different positions with respect to the projected image. It is arranged so that it may be arranged.
According to a fifth aspect of the present invention, there is provided an imaging direction adjusting unit that adjusts a shooting direction of the imaging unit in accordance with a focus adjustment of the image projecting unit.
According to a sixth aspect of the present invention, the plurality of imaging units are configured so that the first imaging unit that captures the entire image projected on the projection plane by the image projecting unit and the light source image of the image projecting unit are not reflected. A second imaging unit that captures a part of the projected image, and the processing unit uses the second imaging unit to capture an image portion including the light source image captured by the first imaging unit. The correction is performed based on the captured image.

A seventh aspect of the present invention is characterized in that the first and second imaging units have different numbers of pixels of the imaging element.
According to an eighth aspect of the present invention, an image projecting unit for projecting an image and an image projection range of the light source image by the image projecting unit are arranged so as to deviate from each other in an imaging range at each photographing position, and projected by the image projecting unit A plurality of imaging means for imaging the entire image so as to partially overlap, an imaging unit moving means for moving the position of the imaging means, and a process for performing predetermined processing on image data captured by the imaging means Means.
A ninth aspect of the present invention is characterized in that the imaging unit moving unit is attached to the position eccentric with respect to the rotation axis, and the imaging unit is moved by rotation of the rotation axis.

According to a tenth aspect of the present invention, there is provided adjustment pattern projection means for projecting a position adjustment pattern in an area where the imaging ranges of the plurality of imaging means overlap, and relative positions of the respective imaging means are determined using the imaging positions of the patterns. The present invention is characterized in that an imaging position deviation detecting means for detecting a typical position deviation amount is provided.
The eleventh aspect is characterized in that the projection method is rear projection, and the projection optical axis is arranged so as to be orthogonal to the center of the screen.

  According to the present invention, an image projecting unit that projects an image, an image capturing unit moving unit that moves the position of the image capturing unit, and an image capturing unit that captures a light source image by the image projecting unit in an image capturing range at each capturing position. An imaging unit that captures the entire projected image by partially overlapping by moving to a position where the insertion position is shifted from each other, and a processing unit that performs a predetermined process on the image data captured by the imaging unit When photographing with a plurality of imaging units, the imaging unit is moved to a position where the reflection positions of the light source images are shifted from each other, and the images are partially overlapped, and the light source for each captured image Since the image reflection is performed at different positions with respect to the projected image, a projected image with reduced image degradation can be generated.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is a diagram showing the arrangement of the projection unit and the imaging unit of the projection system of the present invention. FIG. 2 is a perspective view showing the arrangement relationship of FIG. The same components will be described with the same reference numerals as in FIG. As shown in FIGS. 1 and 2, the imaging plane of the screen 2 is plane-symmetric and the imaging units 4 and 5 do not include the symmetrical position of the light source of the projection unit 3 in the imaging range. Thus, the respective imaging units 4 and 5 are arranged, and the imaging ranges of the imaging units 4 and 5 are photographed obliquely to each other. The imaging units 4 and 5 capture the respective imaging ranges by overlapping the center a of the projection range, and the imaging units 4 and 5 are arranged so that the hot spot virtual position 1 does not enter the imaging range.
If you try to shoot in an oblique direction, the shooting distance will partially change, so if you shift the position of the image sensor within the image circle, you may not have to tilt the lens with respect to the projection plane. . Even if the shift alone is not sufficient, the amount of tilt can be reduced, so that it is possible to reduce the partial blur and to reduce the occurrence of keystone distortion.
After imaging, the overlapped portions are adjusted to form one image. When the desired shooting range cannot be covered with only the shift, each image data is adjusted to the shooting position by tilt, so that the keystone distortion correction occurs as shown in FIG. Are combined into one image as shown in FIG.

FIG. 4 is a diagram for explaining how a hot spot is reflected when the projection distance changes. As shown in FIG. 4B, when the projection distance is shortened, a hot spot may be reflected when the angle of view and orientation of the imaging units 4 and 5 are not changed, but as shown in FIG. When the projection distance is extended, there is no reflection of the hot spot. Even if the projection distance is extended, the imaging range of each of the imaging units 4 and 5 can capture an image of the projection range. Therefore, when determining the angle of view and angle of the imaging units 4 and 5, the imaging units 4 and 5 are arranged at positions where the respective imaging ranges overlap at the closest projection distance.
In other words, in order to correct image degradation due to hot spots included in the image projected by the projection unit 3, when the plurality of imaging units 4 and 5 are photographed, the imaging position of the light source image is set in the imaging units 4 and 5. By moving to a position that deviates from each other and photographing the images partially overlapping, it is possible to generate a projected image with reduced image degradation.

  FIG. 5 is a diagram for explaining an operation of correcting a hot spot reflected in the overlap area. FIG. 6 is a perspective view showing the arrangement relationship of FIG. As shown in FIGS. 5 and 6, the respective imaging means 4 and 5 are arranged across the projection unit 3. The positions of the arrow portions A and B in FIG. 5 are positions where hot spots appear on images captured by the respective imaging units. When the projection planes are partially photographed by the imaging units 4 and 5, the hot spots A and B are reflected in the imaging units 4 and 5, but the hot spot positions A and B are In the overlap region C of the shooting range of each other, the hot spot generation position in the imaging units 4 and 5 is different. Therefore, as shown in FIG. 7A, the images of the hot spot reflection positions A and B are complemented as shown in FIG. 7A, and the projection range free from defects due to the hot spot reflections A and B as shown in FIG. The whole image can be made. Since the tilt angle of each camera is small, the shooting range is close to the directly facing position compared to the method described above, so that the keystone distortion can be reduced.

FIG. 8 is a diagram for explaining how a hot spot is reflected when the projection distance changes. As shown in FIG. 8C, when the projection distance is long, the projection range is widened. However, if the orientations of the imaging units 4 and 5 are fixed, the overlapping portion c at the center becomes larger than necessary, or the shooting range does not include the projection range. Therefore, the direction or interval of each of the imaging units 4 and 5 is changed in conjunction with a means for adjusting the focus according to the projection distance. As shown in FIG. 8C, when the projection distance is long, the imaging units are directed inward or the interval between the imaging units is reduced. On the contrary, as shown in FIG. 8B, when the projection distance becomes short, the imaging units are directed outward or the interval between the imaging units is increased. As a method, the rotation of the focus ring of the projection unit is transmitted by a gear or the like to rotate the imaging unit, or the rotation angle of the imaging direction control motor of the imaging unit is detected according to the lens position by detecting the lens position. You may make it control.
That is, in order to correct image degradation due to hot spots included in the image projected by the shadow portion, when photographing with the plurality of imaging units 4, 5, the image capturing units 4, 5 are light source images to the respective captured images. It is possible to generate a projected image with reduced image degradation by arranging so that the reflection of the image occurs at different positions with respect to the projected image.

As shown in FIG. 9, the imaging unit 5 that captures the entire image and the imaging unit 4 that captures a part of the projection image are provided. The image of the whole image pickup unit 5 includes a portion where a hot spot is reflected and the image cannot be captured correctly, but the other image pickup unit 4 has a hot area in which the hot spot moves in the image pickup unit 5. An image is taken from a position where the spot does not appear, and the image captured by the image pickup unit 4 is used to compensate. For example, the imaging unit 5 for whole photographing shoots the entire projection range as shown in FIG. 9, but the hot spot 1 is reflected on the imaging surface at a position overlapping the portion A indicated by the arrow, and the portion is correctly photographed. I can't. In view of this, the other imaging unit 4 is configured to capture the image of the hot spot 1 in order to correctly capture an image at a position that overlaps the hot spot 1 by the imaging unit 5 that captures the entire image. It arrange | positions so that a hot spot may arise in a different position.
In general, the smaller the number of pixels of the image sensor, the lower the price and the smaller the electronic camera. The imaging unit 4 that captures a part of the imaging unit 5 that captures the entire projection in order to compensate for an image at a position where the reflection of the hot spot is generated is employed. . Thereby, it is possible to increase the degree of freedom of arrangement of the imaging unit 4 that captures a part at a reduced cost.

  FIG. 10 is a diagram for explaining the operation when the number of imaging units is one. As shown in FIG. 10, shooting is performed by changing the position of one imaging unit 6 to avoid the reflection of hot spots or by shifting the position of occurrence of hot spots. Then, by taking a picture at each position by reciprocating and synthesizing the image data, although it takes time, the same effect as the case where two imaging units are provided can be obtained.

  FIG. 11 is a diagram for explaining the imaging unit moving means. As shown in FIG. 11, the imaging units 4 and 5 are attached at positions deviated from the rotation shaft 7, and shooting is performed by rotating them by 180 degrees. If the rotation axis 7 coincides with the vertical line at the center of the screen, the image can be flipped upside down. Even if the rotation axis 7 is slightly deviated from the vertical line at the center of the screen, the system can be established if there is a margin in the corrected imaging range.

In addition, as shown in FIG. 12, if the image pickup units 4 and 5 are attached inward, the tilt direction is exactly reversed when rotated 180 degrees. Can be performed by one mechanism.
As shown in FIG. 13, at the central position (overlapping shooting range) 8 where the imaging ranges of the imaging units 4 and 5 overlap each other from the projection unit 3, at the position where no hot spot appears in each imaging unit. The relative position adjustment pattern 9 is projected. The pattern 9 is photographed by each imaging unit, a corresponding position on each imaging surface is detected, and a positional deviation is prevented when the image data is combined. For example, if the imaging unit 5 detects a horizontal line centered on the position of 500 pixels from the top, and the imaging unit 4 detects a horizontal line centered on the position of 490 pixels from the top, when combining image data, Adjustments can be made by shifting either 10 pixels, etc., so that the connecting portion does not become unnatural. Not only the position but also the color of the adjustment pattern is changed to take an image, thereby preventing or reducing the color shift of each image pickup unit.

  As shown in FIG. 14, the optical axis of the lens of the projection unit 3 and the center A of the screen 2 are aligned. In the case of the rear screen, depending on the material of the screen 2, the hot spot is not visible from the viewer side, or even if it is visible, the hot spot can be hardly noticed. When the maximum incident angle at the peripheral part is made the same, the projection distance is shortened compared to the case of launching projection, so that the housing can be downsized. In addition, when the projection unit 3 is arranged in this way, it is necessary to greatly increase the shooting distance if one imaging unit tries to avoid a hot spot. There is a possibility that the projection system cannot be established because it does not fall within the depth. By dividing the image pickup unit, each image pickup range becomes narrow, so when shooting at the same angle of view, the distance between the image pickup unit and the screen can be reduced, and the mirror for bending the optical path can be eliminated or reduced. You can also.

It is a figure which shows arrangement | positioning of the projection part and imaging part of the projection system of this invention. It is the perspective view which showed the arrangement | positioning relationship of FIG. It is a figure explaining keystone distortion correction. It is a figure explaining the mode of a hot spot reflection when a projection distance changes. It is a figure explaining the operation | movement which correct | amends the hot spot reflected in the overlap area | region. It is the perspective view which showed the arrangement | positioning relationship of FIG. It is a figure explaining a mode that an image without a hot spot is complemented and amended. It is a figure explaining the mode of a hot spot reflection when a projection distance changes. It is a figure which correct | amends a hot spot by the whole imaging part and a partial imaging part. It is a figure explaining the operation | movement at the time of using one imaging part. It is a figure explaining an imaging part moving means. It is a figure explaining another imaging part moving means. It is a figure which correct | amends using the pattern for adjustment. It is a figure explaining the case where a rear screen is used. It is a figure explaining the means to avoid the reflection of the conventional hot spot. It is a figure explaining the subject of the conventional launch projection.

Explanation of symbols

  1 hot spot, 2 screens, 3 projection unit, 4, 5, 6 imaging unit, 7 rotation axis, 8 overlapping shooting range, 9 adjustment pattern, 10 shooting range

Claims (11)

  An image projecting unit that projects an image, an image capturing unit moving unit that moves the position of the image capturing unit, and the image capturing / moving unit allow the reflection positions of the light source images by the image projecting unit to be within the imaging range at each image capturing position. An image capturing unit that captures the entire projected image by partially overlapping by moving to a position that deviates, and a processing unit that performs predetermined processing on image data captured by the image capturing unit. Projection system characterized by that.   The plurality of imaging means are arranged at positions where the respective imaging ranges overlap at the maximum angle of view and at the closest projection distance when determining the angle of view and the angle of the imaging means. The projection system described in 1.   3. The projection according to claim 1, wherein the processing unit adjusts an overlapping portion of the images captured by the imaging unit and combines them into one image data, and corrects image distortion due to an angle of view. system.   An image projecting unit that projects an image onto a projection surface, a plurality of image capturing units that capture the entire image projected by the image projecting unit so as to partially overlap, and image data captured by the image capturing unit Processing means for performing predetermined processing on the plurality of imaging means, and the plurality of imaging means are arranged so that the reflection of the light source image in each captured image occurs at different positions with respect to the projected image. Projection system characterized by this.   5. The projection system according to claim 1, further comprising an imaging direction adjusting unit configured to adjust a shooting direction of the imaging unit in accordance with a focus adjustment of the image projecting unit. The plurality of imaging units include a first imaging unit that captures an entire image projected on a projection plane by the image projecting unit, and the projected image so that a light source image of the image projecting unit is not reflected. A second imaging means for imaging a part of
The projection system according to claim 4, wherein the processing unit corrects an image portion including the light source image captured by the first imaging unit with an image captured by the second imaging unit.   The projection system according to claim 6, wherein the first and second imaging units have different numbers of pixels of the imaging element. Image projection means for projecting an image;
A plurality of light source image reflection positions by the image projection means are arranged so as to deviate from each other within an imaging range at each photographing position, and a plurality of images are captured so as to partially overlap the entire image projected by the image projection means. Imaging means;
An imaging unit moving means for moving the position of the imaging means;
A projection system comprising: processing means for performing predetermined processing on image data picked up by the image pickup means.   9. The imaging unit moving unit according to claim 8, wherein the imaging unit is attached to a position eccentric with respect to a rotation axis, and the imaging unit is moved by rotation of the rotation axis. Projection system.   An adjustment pattern projection unit that projects a pattern for position adjustment onto an area where the imaging ranges of the plurality of imaging units overlap is provided, and a relative positional shift amount of each of the imaging units using the imaging position of the pattern The projection system according to any one of claims 1 to 9, further comprising an imaging position deviation detection unit that detects the image.   11. The projection system according to claim 1, wherein the projection method is rear projection, and the projection optical axis is arranged so as to be orthogonal to the center of the screen.

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