JP2007202177A - Projector and multi-projection display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To project an optimum image according to the posture of a screen and that of a projector. <P>SOLUTION: The image of a range including a frame F of a screen SCR is picked up to obtain a pickup image, and the screen frame F is detected from the pickup image. Based on the shape of the screen frame F and the shape of a projection image Ia on the screen obtained from the pickup image, the shape of the projection image is corrected. By the correction, the posture of the projector is corrected, for example, so that the shape of the projection image projected on the screen may coincide with or approximate the shape of the frame of the screen. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector, a projection image correction method for a projector, a multi-projection display, a projection image correction method for a multi-projection display, and a screen device.

  By arranging a plurality of projection optical units (referred to as projectors) in the horizontal direction or the vertical direction, or in the horizontal direction and the vertical direction, respectively, and projecting the projected images from the plurality of projectors onto the screen A multi-projection display capable of displaying one large screen image is known (for example, see Patent Documents 1 to 4). Note that tiling projection is a projection method in which projection areas of a plurality of projectors are arranged in a tile shape on a screen, and a single large screen image can be displayed.

  Such multi-projection displays can display high-definition and high-brightness images compared to ordinary projectors, so movie theaters, museums, museums, seminar venues, gathering venues, mini theaters, public institutions, It is expected to be widely used in the future in the business fields such as companies, and in the home fields such as amusements and home theaters.

  In such a multi-projection display, it has been generally performed conventionally to partially overlap projected images from adjacent projectors on a screen. As described above, when the projection images from the adjacent projectors are partially overlapped on the screen, the brightness of the overlapped portion is higher than that of the other portions, so that there is a problem that the joint becomes conspicuous.

  By the way, in such a multi-projection display, it is possible to smoothly connect these projected images on the screen unless it is accurately understood how the projected images from the respective projector units are displayed on the screen. Therefore, in the multi-projection displays disclosed in Patent Documents 1 to 4, an image pickup device (such as a monitoring camera or a digital camera) is installed on the viewer side, and a projected image (from each projector unit displayed on the screen) The image for adjustment) is taken so that it is possible to accurately measure how these projected images are displayed on the screen.

JP 2001-339672 A WO99 / 31877 pamphlet JP-A-9-326981 Japanese Patent Laid-Open No. 2001-251651

However, in the multi-projection displays disclosed in Patent Documents 1 to 4, since the image pickup apparatus is installed on the viewer side and an adjustment image is taken, when the adjustment work is finished, the image pickup apparatus is cleaned ( (Withdrawal work) is performed. For this reason, when the adjustment work is performed again, the imaging device is installed again. In this case, it is necessary to install the imaging device at an accurate position with respect to the multi-projection display. Since the installation work of the image pickup apparatus is usually performed manually, there is a problem that the adjustment work becomes complicated and the adjustment time becomes long.
For this reason, there is a problem that it is not easy to apply such a multi-projection display to a relatively small business use or home use.
Therefore, the present invention has been made to solve such a problem, and adjustment work is easy and adjustment time is short, so that it can be suitably used for relatively small business use and home use. An object of the present invention is to provide a projector capable of performing the above, a projected image correction method for a projector, a multi-projection display, a projected image correction method for a multi-projection display, and a screen device.

  (1) A projector according to the present invention includes an imaging unit capable of imaging a predetermined range including a screen frame and outputting the captured image, and a screen frame for detecting the screen frame from a captured image obtained by the imaging unit. And a shape correcting unit capable of correcting the shape of the projected image based on the shape of the screen frame detected by the screen frame detecting unit and the shape of the projected image on the screen obtained from the captured image. It is characterized by having.

  Thus, by correcting the shape of the projected image based on the shape of the frame of the screen and the shape of the projected image projected on the screen, the shape distortion of the projected image on the screen can be easily and appropriately performed. The correction can be made without requiring a large-scale means. Further, for example, even when the screen must be installed with an inclination depending on the situation of the presentation venue, a projection image with an appropriate shape correction can be displayed according to the inclination of the screen. .

  (2) In the projector described in (1), shape correction for correcting the shape of the projected image based on the shape of the frame of the screen and the shape of the projected image on the screen obtained from the captured image. A shape correction information generation unit configured to generate information; and the shape correction unit is configured such that the shape of the projected image on the screen is based on the shape correction information generated by the shape correction information generation unit. It is preferable to have a function of controlling the attitude of the projector so as to match or approximate the shape of the projector.

  Thus, the shape of the projected image can be easily and appropriately adjusted only by correcting the posture of the projector so that the shape of the projected image projected on the screen matches or approximates the shape of the frame of the screen. Therefore, the complicated adjustment work as in the prior art becomes unnecessary.

(3) In the projector described in (2), shape correction instruction information that indicates what correction should be performed based on the shape correction information can be projected onto the screen. .
As a result, the user can correct the posture of the projector while viewing the shape correction instruction information projected on the screen, so that the shape correction can be performed easily and appropriately.

(4) In the projector according to any one of (1) to (3), as the shape correcting unit, a posture correcting unit capable of correcting the shape of the projected image by correcting the posture of the projector, and software And at least one of image correction means capable of correcting the shape of the projected image by image processing by processing, and correcting the shape of the projected image by at least one of the posture correction means and the image correction means by software processing. Is preferred.
As described above, it is possible to easily and appropriately correct the shape of the projected image by having both or one of the posture correcting unit capable of correcting the posture of the projector and the image correcting unit by software processing as the shape correcting unit. it can.
In particular, by providing both an attitude correction means capable of correcting the attitude of the projector and an image correction means by software processing, for example, first, the attitude correction means mechanically controls the attitude of the projector to correct the shape of the projected image. After performing the above, image correction processing by software processing can be performed as necessary. As a result, it is possible to more appropriately correct geometric distortion that cannot be corrected by mechanical projector attitude control. As a result, it is possible to further appropriately correct the shape and to increase the number of effective pixels.

  (5) In the projector according to any one of (1) to (4), an attitude detection unit capable of detecting the attitude of the projector and outputting the attitude information of the projector, and a projector obtained by the attitude detection unit It is preferable to further include posture correction information generation means capable of generating posture correction information for correcting the posture of at least one of the projector and the screen based on the posture information.

  As described above, by using the attitude information of the projector obtained by the attitude detection means (such as an orientation sensor), it is possible to further improve the accuracy of the shape correction. Further, in addition to the shape of the screen frame detection information and the projection image information, information for correcting the attitude of the projector and the screen (screen attitude correction information) is generated based on the attitude information of the projector obtained by the attitude detection means. In addition, the attitude of the projector and the screen can be corrected using the screen attitude correction information. At this time, posture correction instruction information for instructing the user how to correct based on the posture information is projected on the screen SCR, and the user views the projected posture correction instruction information. However, it is also possible to manually correct the attitude of the screen SCR, and it is also possible to automatically correct the attitude of the projector and the screen based on the attitude information.

(6) In the projector according to (5), it is possible to further provide an attitude correction information transmitting unit capable of transmitting the attitude correction information generated by the attitude correction information generating means to the screen.
Thereby, the posture correction information can be transmitted to the screen side, and the screen posture can be controlled.

  (7) According to the projection image correction method of the projector of the present invention, an imaging unit capable of imaging a predetermined range including a screen frame and outputting the captured image, and the screen frame from the captured image obtained by the imaging unit. A screen frame detecting means for detecting the shape of the projected image, and the shape of the projected image can be corrected based on the shape of the screen frame detected by the screen frame detecting means and the shape of the projected image obtained from the captured image. A projection image correction method for a projector having a corrective shape correcting means, the step of detecting the frame of the screen from the captured image, the shape of the screen frame detected by the step, and the captured image obtained from the captured image And a step of correcting the shape of the projected image based on the shape of the projected image on the screen.

  According to the projection image correction method for a projector described in (7), it is possible to obtain the same effect as that obtained by the projector of (1). Further, the projected image correction method of the projector described in (7) preferably has the same characteristics as the projectors of (2) to (6).

  (8) A multi-projection display according to the present invention includes a unit image information generating unit capable of generating a plurality of unit image information and a plurality of projectors for projecting unit images based on the unit image information generated by the unit image information generating unit. A multi-projection display comprising: an imaging unit capable of imaging a predetermined range including a frame of the screen and outputting the captured image; and a screen for detecting the frame of the screen from the captured image obtained by the imaging unit Frame detecting means, and a shape correcting means capable of correcting the shape of the projected image based on the shape of the screen frame detected by the screen frame detecting means and the shape of the projected image on the screen obtained from the captured image It is characterized by having.

  Thereby, the same effect as the projector of (1) can be obtained. In particular, in a multi-projection display using a plurality of projectors, it is required to appropriately and efficiently correct the shape of a projected image from each projector. According to the present invention, the shape of a projected image is corrected. Since the adjustment work such as can be completed in a short time, the effect becomes more remarkable. Note that the multi-projection display described in (8) preferably has the same characteristics as the projectors described in (2), (3), and (4).

(9) In the multi-projection display according to (8), it is preferable that the imaging unit is provided in a housing of the multi-projection display.
Thereby, the projected image on the screen can be captured accurately and easily.

(10) In the multi-projection display according to (8) or (9), it is preferable that the imaging unit is provided in each projector.
As described above, by providing an imaging unit in each projector and performing shape correction based on a captured image obtained by the imaging unit of each projector, more accurate shape correction can be performed.

  (11) In the multi-projection display according to any one of (8) to (10), an attitude detection unit capable of detecting an attitude of the multi-projection display and outputting attitude information of the multi-projection display, and the attitude It is preferable to further include attitude correction information generating means for generating attitude correction information for correcting the attitude of at least one of the multi-projection display and the screen based on the attitude information of the multi-projection display obtained by the detecting means.

  Thereby, the same effect as the projector described in (5) can be obtained. In particular, in a multi-projection display that performs tiling projection using a plurality of projectors, it is required to appropriately and efficiently correct the shape of a projected image from each projector. Since adjustment work such as shape correction of the projected image can be completed in a short time, the effect becomes more remarkable.

(12) In the multi-projection display according to (11), it is preferable that the posture detection unit is provided in a housing of the multi-projection display.
Thereby, the posture information of the multi-projection display can be acquired efficiently.

(13) In the multi-projection display according to any one of (11) and (12), it is preferable that the posture detection unit is provided in each projector.
As described above, by providing the posture detection means in each projector, posture information of each projector can be obtained. In addition, by providing each projector with attitude detection means, the positional relationship between each projector and the screen can be obtained with high accuracy, and the shape of the projected image can be corrected with higher accuracy, and the attitude of the screen can be corrected. The posture correction information to be performed can be highly accurate.

(14) The multi-projection display according to any one of (11) to (13), further including an attitude correction information transmitting unit capable of transmitting the attitude correction information generated by the attitude correction information generating unit to the screen. It is preferable.
Thereby, the posture correction information can be transmitted to the screen side, and the screen posture can be controlled.

(15) A projection image correction method for a multi-projection display according to the present invention includes a unit image information generation unit capable of generating a plurality of unit image information, and a unit image based on the unit image information generated by the unit image information generation unit. A plurality of projectors for projecting; an imaging unit capable of imaging a predetermined range including a screen frame and outputting the captured image; and a screen frame detection unit for detecting the screen frame from a captured image obtained by the imaging unit And a shape correcting means capable of correcting the shape of the projected image based on the shape of the screen frame detected by the screen frame detecting means and the shape of the projected image on the screen obtained from the captured image. A projection image correction method for a multi-projection display, wherein the screen detects a frame of the screen from the captured image And a step of correcting the shape of the projected image based on the shape of the frame of the screen detected by the step and the shape of the projected image on the screen obtained from the captured image. It is said.
As a result, the same effect as the multi-projection display described in (8) can be obtained. Also, the multi-projection display described in (15) preferably has the same characteristics as the multi-projection displays described in (9) to (14).

  (16) A screen device of the present invention is a screen device having a screen for displaying a projected image projected from the projector according to claim 6 or the multi-projection display according to claim 14, wherein the posture correction information transmitting unit A posture correction control unit that performs posture correction control based on posture correction information transmitted from the computer, and a screen operation unit that corrects the posture of the screen by the control of the posture correction control unit.

  As a result, the screen for displaying the projected image can be set to an optimum posture corresponding to the posture of the projector. This screen device can be used as a screen device for a single projector, and can also be used as a screen device for a multi-projection display composed of a plurality of projectors.

Embodiment 1
FIG. 1 is a diagram for schematically explaining the external configuration of a projector 1 according to the first embodiment. A casing 2 is provided with a projection lens 3 and an image sensor 141 provided in the immediate vicinity of the projection lens 3. Yes.

FIG. 2 is a configuration diagram for explaining the function of the projector 1. Only components necessary for the description of the present invention are shown, and illustration of other components is omitted.
2 includes a screen frame detection unit 110, a shape correction information generation unit 111, an image information generation unit 112, an optical correction unit 113, an image information correction unit 114, a control unit 11 having an image processing unit 115, a TV antenna. A video signal receiving unit 12 that receives video supplied via a video player or a DVD player, an adjustment image information storage unit 13 that stores adjustment image information, an imaging device 14, and a correction parameter storage unit 15. is doing.

  The imaging device 14 includes an imaging element 141 and an AD conversion element 142 that converts an analog signal from the imaging element 141 into a digital signal. The imaging element 141 has an imaging range set so that a predetermined range including the entire screen SCR, that is, a frame F of the screen SCR (see FIG. 3 and FIG. 4) can be captured. In addition, the image sensor 141 has a zoom function and an autofocus function. For this reason, since the imaging range and magnification can be changed as appropriate, the degree of freedom and flexibility of shooting are improved, and focus adjustment is automatically performed, which is convenient.

  The screen frame detection unit 110 has a function of detecting a frame F of the screen SCR (hereinafter referred to as a screen frame F) based on a captured image from the imaging device 14 and outputting screen frame detection information.

  In addition, the shape correction information generation unit 111 is based on the screen frame detection information detected by the screen frame detection unit 110 based on the captured image obtained from the imaging device 14 and the projection image projected on the screen SCR. It has a function of generating correction information.

  The image information generation unit 112 can generate image information to be projected based on the original image information A corresponding to the video signal received by the video signal reception unit 12 and is stored in the adjustment image information storage unit 13. On the basis of the original adjustment image information B, predetermined adjustment image information can be generated.

  When the projector 1 is used alone, the image information generation unit 112 generates image information to be projected by the projector 1 based on the original image information A. Similarly, the adjustment image information in this case also generates adjustment image information that the projector 1 should adjust based on the original adjustment image information B.

  On the other hand, when performing tiling projection using a plurality of projectors, based on the original image information A, based on the function of generating unit image information corresponding to each of the plurality of projectors and the original adjustment image information B, It also has a function of generating unit image information for adjustment corresponding to each of a plurality of projectors.

  The optical correction unit 113 serves as a posture correction unit for the projector 1, and optically corrects the posture of the housing 2 (the tilt of the housing 2 and the projection direction of the projection lens 3) in the projector 1. Is possible. In the present invention, the optical correction unit 113 has a function of correcting the posture of the projector 1 based on the shape correction information generated by the shape correction information generation unit 111 described above.

  The image information correction unit 114 has a function that enables correction of a projected image by performing image processing by software processing based on the imaging result of the imaging device 14. Further, when tiling projection is performed using a plurality of projectors, a boundary (including an overlapping portion) between unit images projected by projectors adjacent to each other among the plurality of projectors is not conspicuous on the screen SCR. Have a function of correcting the unit image information.

  For example, when the projector 1 is used alone, the adjustment image formed by the adjustment image information projected by the projector 1 is compared with the original adjustment image information B, and the projection projected by the projector 1 is performed. It also has a function for correcting the shape, position and inclination of the image (collectively, shape correction) and a function for correcting the brightness and color (pixel value) of the projected image projected by the projector 1. is doing.

  When tiling projection is performed using a plurality of projectors, the image information correction unit 114 is formed by four adjustment unit image information projected by a plurality (four projectors) of projectors 1. And a function for correcting the shape, position, and tilt of the unit image projected by each projector 1 by comparing the adjustment image as a whole and the original adjustment image information B, and projecting by each projector 1 It also has a function of correcting the brightness and color (pixel value) of the projected image.

The image processing unit 115 has a function of performing image processing on the imaging result of the imaging element 141, comparing it with the original adjustment image information B, and outputting the result to the image information correction unit 114. Yes.
The correction parameter storage unit 15 has a function of storing correction parameters determined when the image information correction unit 114 corrects image information.

  The function of the projector 1 configured as described above will be described with reference to FIGS. First, adjustment image information based on the original adjustment image information B stored in the adjustment image information storage unit 13 is generated by the image information generation unit 112, and the adjustment image information corresponding to the generated adjustment image information is generated. The image is projected on the screen SCR.

  FIGS. 3A and 3B are captured images obtained by capturing an image (projected image Ia) projected on the rectangular screen SCR from one projector 1 with the image sensor 141, and the screen An SCR frame F and a projected image Ia projected on the screen SCR are obtained as captured images. The imaging element 141 is provided at a position very close to the projection lens 3, and the optical axis thereof is not significantly different from the projection axis of the projection lens 3.

  In FIG. 3A, as shown in FIG. 4A, the projector 2 is installed in the vertical direction so that its projection axis is inclined upward by a predetermined angle with respect to the horizontal direction. It is a picked-up image obtained with the image pick-up element 141 at the time of projecting on the standing screen SCR.

FIG. 4 (a), FIG. 4 (b) described later, and FIGS. 5, 8, and 11 show an example of the screen device 200 of the present invention. In appearance, the screen SCR for displaying the projected image, the screen mounting plate 21 to which the screen SCR is mounted, and the screen mounting plate 21 have a screen support base 22 that is movably supported. .
4, 5, 8, and 11, the imaging range of the imaging element 141 is indicated by a solid line, the projection range by the projection lens 3 is indicated by a broken line, and the projection axis of the projection lens 3 is indicated by a one-dot chain line.

  By the way, when the projector is installed as shown in FIG. 4A, the shape of the frame F of the screen SCR and the projected image Ia is as shown in FIG. 3A as can be seen from the captured image shown in FIG. The shape is as shown in (i). In this case, when the screen SCR is viewed from the line-of-sight direction orthogonal to the screen SCR, the projected image Ia is in a state in which shape distortion has occurred in the screen frame F.

  A shape correction is performed on the projected image Ia in which the shape distortion has occurred so that the shape of the projected image Ia is the same as the shape of the screen SCR or approximates as much as possible. That is, shape correction is performed so that each side of the projected image Ia is parallel to each side of the frame F of the screen SCR. As a result, the shape of the projected image Ia shown in (i) of FIG. 3A is corrected as shown in (ii) of FIG.

  On the other hand, in the case of FIG. 3B, as shown in FIG. 4B, the projector 1 is installed such that its projection axis is inclined to the right in the horizontal direction by a predetermined angle with respect to the screen SCR, and the vertical direction This is a case where the image is projected on a screen SCR installed upright. FIG. 4B is a plan view of the screen SCR of FIG. 4A as viewed from above, and the same parts as those in FIG.

  When the projector is installed as shown in FIG. 4B, the shape of the frame F of the screen SCR and the projected image Ia is as shown in FIG. 3B, as can be seen from the captured image shown in FIG. The shape is as shown in (i). Also in this case, as in FIG. 3A, shape correction is performed on the projected image Ia in which shape distortion has occurred so that each side of the projected image Ia is parallel to each side of the frame F of the screen SCR. Thereby, the shape of the projected image Ia shown in (i) of FIG. 3B is corrected as shown in (ii) of FIG.

  The shape correction in FIGS. 3A and 3B includes, for example, screen frame detection information obtained based on a captured image from the image sensor 141 and projection image information obtained based on the captured image. The shape correction information generation unit 111 receives the shape correction information, and the shape correction information generation unit 111 generates shape correction information based on the screen frame detection information and the projection image information, and supplies the shape correction information to the optical correction unit 113. It can be carried out. In this case, the optical correction unit 113 corrects the attitude of the projector 1 based on the shape correction information so that each side of the projected image is parallel to the outer frame of the screen SCR. As a result, shape correction as shown in FIGS. 3A and 3B is possible.

  As another method of shape correction, the shape correction information generated by the shape correction information generation unit 111 is displayed on a screen SCR or the like, and the user manually adjusts the attitude of the projector while watching the display. it can. Furthermore, by giving an instruction to the optical correction unit 113 for the user to correct the attitude of the projector 1 while viewing the display, the optical correction unit 113 can perform correction based on the instruction.

  Further, in addition to the shape correction by the optical correction means 113 described above, image correction processing by software in the image information correction unit 114 can be performed. In this method, first, after correcting the shape of the projected image by mechanically controlling the attitude of the projector 1 by the optical correction means 113, an image correction process by a software process is performed as necessary.

Accordingly, it is possible to more appropriately correct the geometric distortion that cannot be corrected only by the mechanical attitude control of the projector 1. As a result, it is possible to further appropriately correct the shape and to increase the number of effective pixels. Note that shape correction can be performed only by image correction processing by the image information correction unit 114.
In the above description, the screen SCR is vertical. However, even when the screen SCR is tilted back and forth, for example, optimal shape correction can be performed.

  Further, the projector 1 having the above-described function is further provided with orientation detection means (not shown in the first embodiment) such as an orientation sensor for detecting its own orientation, and based on the screen frame detection information and the projection image information. By using the posture information of the projector 1 obtained by the posture detection means in addition to the generated shape correction information, the accuracy of the shape correction can be further increased.

  Further, based on the attitude information of the projector obtained by the attitude detection means, attitude correction information for correcting the attitude of the projector 1 and the attitude of the screen SCR is generated, and the projector 1 and the screen SCR are used using the attitude correction information. It is also possible to correct the posture.

  In order to correct the attitude of the screen SCR, although not shown here, for example, an attitude correction information transmission function for transmitting the attitude correction information to the screen SCR side is provided on the projector 1 side. On the other hand, on the side of the screen device 200 having the screen SCR, a posture correction information receiving unit that receives posture correction information transmitted from the projector 1 and a screen as a screen operation unit that corrects the posture (tilt, etc.) of the screen SCR. By providing an operation unit and an attitude correction control unit that controls the screen operation unit based on the attitude correction information received by the attitude correction information receiving unit, the screen is automatically set based on the attitude correction information transmitted from the projector 1. It is possible to correct the attitude of the SCR.

  In addition, attitude correction instruction information for instructing the user how to correct based on the attitude information obtained by the projector 1 is projected on the screen SCR, and the user then projects the projected attitude. It is also possible to manually correct the orientation of the screen SCR while viewing the correction instruction information.

[Embodiment 2]
FIG. 5 is a diagram showing a configuration of a front projection type multi-projection display (hereinafter simply referred to as a multi-projection display) according to Embodiment 2 of the present invention. FIG. 5 (a) is a front view, and FIG. FIG. 5C is a cross-sectional view seen from the side, and FIG. 5C is a diagram showing a projected image projected on the screen SCR.

  In the multi-projection display 100 according to the second embodiment, as shown in FIG. 5, projection images Ia, Ib, Ic, and Id from the four projectors 1 arranged in the housing 102 are projected onto the screen SCR. It is a multi-projection display. As shown in FIG. 5, the multi-projection display 100 is used by being installed on a table 101, for example.

  An imaging element 141 of the imaging device 14 (see FIG. 6) is provided inside the casing 102 of the multi-projection display 100 (immediately inside the front surface). As described in the first embodiment, the imaging element 141 has an imaging range set so that the entire screen SCR, that is, a predetermined range including the frame F of the screen can be imaged.

  As shown in FIG. 5, the image sensor 141 is provided in the housing 102 of the multi-projection display 100. However, the image sensor 141 is preferably provided not only in the housing 102 of the multi-projection display 100 but also in each projector 1. 2, it is assumed that each projector 1 is also provided with an image sensor 141. Note that the image sensor 141 provided in each projector 1 is preferably provided very close to the projection lens 3 of each projector 1 as described in the first embodiment.

  Each projector 1 is provided with an optical correction unit 113 capable of correcting the attitude of each projector 1, and the function thereof is the attitude of the housing 2 in the projector 1 (as described in the first embodiment). The projector 1 can be optically corrected with respect to the inclination of the casing 2 of the projector 1 and the projection direction of the projection lens 3. The shape correction information generated by the shape correction information generation unit 111 described above can be used to correct the projector 1. It has a function that can correct the posture.

  FIG. 6 is a configuration diagram for explaining the function of the multi-projection display 100 according to the embodiment. The basic configuration is the same as that in FIG. 2 described in the first embodiment, and the same parts are denoted by the same reference numerals. ing.

  Since the second embodiment is an example of a multi-projection display, based on the original image information A received by the video signal receiving unit 12 or the original adjustment image information B stored in the adjustment image information storage unit 13, Unit image information (unit image information A1 to An and adjustment unit image information B1 to Bn) displayed by each projector 1 is generated. Therefore, the image information generation unit 112 shown in FIG. 2 is the unit image information generation unit 116 in FIG. Similarly, the image information correction unit 114 shown in FIG. 2 is a unit image information correction unit 117 in FIG.

  In such a multi-projection display 100, an example of shape correction using screen frame detection information obtained based on a captured image from the image sensor 141 and a projected image will be proved with reference to FIG.

  In the second embodiment, the four projectors 1 are arranged in the vertical direction and the horizontal direction in a configuration of 2 × 2 units. However, here, in order to simplify the description, two projectors ( A case where tiling projection is performed by arranging projectors PJa and PJb) will be described.

  7A, 7B, and 7C, two projectors PJa and PJb are arranged in the vertical direction as shown in FIG. 8, and the projection axis of the projector PJa (shown by a one-dot chain line) is shown. ) Is tilted upward by a predetermined angle with respect to the horizontal direction, and the projection axis of the projector PJb (shown by a one-dot chain line) is tilted downward by a predetermined angle with respect to the horizontal direction. Is shown, and a frame F of the screen SCR and projection images Ia and Ib projected on the screen SCR are obtained as the captured images.

  FIG. 7A illustrates a case where shape correction is performed using a captured image obtained by the image sensor 141 provided in the housing 102 of the multi-projection display 100. It is assumed that the image sensor 141 is installed between the two projectors PJa and PJb, that is, at the center of the line connecting the centers of the projection lenses 3 of the two projectors PJa and PJb.

  Thus, in the captured image obtained by the image sensor 141 provided in the housing 102 of the multi-projection display 100, as can be seen from FIG. 7A, the frame F of the screen SCR and the projected images Ia and Ib are displayed. The shape is as shown in (i) of FIG. In this case, when the screen SCR is viewed from a line-of-sight direction orthogonal to the screen SCR, the projected images Ia and Ib are in a state in which shape distortion occurs in the screen frame F.

  As described with reference to FIG. 3 of the first embodiment, the sides of the projection images Ia and Ib are parallel to the sides of the frame F of the screen SCR with respect to the projection images Ia and Ib having the shape distortion. Perform shape correction. As a result, the projected images Ia and Ib shown in (i) of FIG. 7 (a) are corrected as shown in (ii) of FIG. 7 (a).

FIG. 7B shows a captured image captured by the image sensor 141 provided in the projector PJa installed on the upper side.
Thus, in the captured image obtained by the imaging element 141 provided in the projector PJa installed on the upper side, as can be seen from FIG. 7B, the shape of the frame F of the screen SCR and the projected images Ia and Ib. However, the shape is as shown in (i) of FIG. Also in this case, the shape correction is performed on the projection images Ia and Ib in which the shape distortion has occurred so that the sides of the projection images Ia and Ib are parallel to the sides of the frame F of the screen SCR. As a result, the projected images Ia and Ib shown in (i) of FIG. 7B are corrected in shape as shown in (ii) of FIG. 7B.

FIG. 7C shows a captured image captured by the image sensor 141 provided in the projector PJb installed on the lower side.
Thus, in the captured image obtained by the imaging device 141 provided in the projector PJb installed on the lower side, as can be seen from FIG. 7C, the frame F of the screen SCR and the projection images Ia and Ib are displayed. The shape is as shown in (i) of FIG. Also in this case, shape correction is performed so that each side of the projected images Ia and Ib is parallel to each side of the frame F of the screen SCR. As a result, the projected images Ia and Ib shown in (i) of FIG. 7 (c) are corrected as shown in (ii) of FIG. 7 (c).

  The shape correction in FIGS. 7A, 7 </ b> B, and 7 </ b> C is the same as the screen frame detection information obtained based on the captured image from the image sensor 141 as described in the first embodiment. The shape correction information generation unit 111 receives the projection image information obtained based on the image, the shape correction information generation unit 111 generates shape correction information based on the screen frame detection information and the projection image information, and the shape correction By providing the information to the optical correction unit 113 of each projector 1, the optical correction unit 113 can perform the posture correction of each projector 1.

  As another method of shape correction, the shape correction information generated by the shape correction information generation unit 111 is displayed on a screen SCR or the like, and the user manually adjusts the posture of each projector while viewing the display. You can also. Furthermore, by giving an instruction to the optical correction unit 113 for the user to correct the posture of each projector 1 while viewing the display, the optical correction unit 113 can perform correction based on the instruction.

  Further, in addition to the shape correction by the optical correction means 113 described above, image correction processing by software in the image information correction unit 114 can be performed. Thereby, it is possible to more appropriately correct the geometric distortion that cannot be corrected only by the mechanical attitude control of the projector. It is also possible to perform shape correction only by image correction processing by the image information correction unit 114.

  In the above description, the screen SCR is vertical. However, even when the screen SCR is tilted back and forth, for example, optimal shape correction can be performed.

  Note that the shape correction process in FIG. 7 described above is actually a shape correction process using not only a captured image from one image sensor 141 but also a captured image obtained by another image sensor 141. Is preferred. For example, in the case of FIG. 7A, not only the captured image from the image sensor 141 provided in the housing 102 of the multi-projection display 100 but also the respective images provided in the two projectors PJa and PJb. A captured image from the element 141 is used. As a result, more accurate shape correction can be performed.

[Embodiment 3]
In the third embodiment, in the second embodiment, each projector 1 is provided with posture detection means such as a direction sensor that detects its own posture, and the shape of the frame F of the screen SCR and the projection projected onto the screen SCR are described above. In addition to the shape of the image, the posture information of the projector 1 obtained by this posture detection means is used to correct the shape of the projected image and control the posture of the screen SCR (including vertical and horizontal tilts and positions). It is possible.

  FIG. 9 is a configuration diagram illustrating functions of the multi-projection display 100 according to the third embodiment. The basic structure of the multi-projection display 100 according to the third embodiment is the same as that shown in FIG. 6, and the same parts as those shown in FIG.

  9 differs from FIG. 6 in that each projector 1 can correct the orientation of the orientation detection device 16 having the orientation sensor 161 and the A / D conversion element 162 and / or the orientation of the projector 1 and / or the screen SCR. The posture correction information generation unit 118 that generates posture correction information for the above is provided.

  Attitude detection information (information indicating what attitude the projector 1 is currently in) is output from the orientation sensor 161 of the attitude detection device 16. Although the azimuth sensor 161 shown in FIG. 9 is shown in FIG. 9 as if it were provided separately from the projector 1, the azimuth sensor 161 is provided in each projector 1. Shall.

  As described above, in the multi-projection display 100 according to the third embodiment, each projector 1 is provided with the azimuth sensor 161 that detects its own posture, and the shape of the frame F of the screen SCR described above and the projected image projected onto the screen SCR. By using the attitude information of the projector 1 obtained by the attitude detection device 16 in addition to the shape of the projector, it is possible to perform more accurate shape correction, and in addition, it is possible to correct the attitude of the projector itself and the screen SCR. And

  In order to perform the posture correction of the screen SCR, the posture correction instruction information for instructing how to correct the posture of the screen SCR based on the posture correction information generated by the posture correction information generation unit 118 is displayed on the screen. One method is to project the image on the SCR and correct the attitude of the screen SCR while viewing the projected attitude correction instruction information.

  As another method for correcting the orientation of the screen SCR, for example, as shown in FIG. 10, the orientation correction information is sent to the screen device 200 (screen SCR, screen mounting plate 21, screen support base 22 as shown in FIG. A posture correction information transmitting unit 17 having a function of transmitting (either wireless or wired) is provided.

  On the other hand, on the screen device 200 side, an attitude correction information receiving unit 201 that receives attitude correction information transmitted from the multi-projection display 100, a screen operation unit 202 that corrects the attitude of the screen SCR, and an attitude correction information receiving unit. An attitude correction control unit 203 that controls the screen operation unit 202 based on the attitude correction information received in 201 is provided.

  Accordingly, the screen device 200 can perform posture correction such as automatically tilting the screen SCR in the vertical direction and the horizontal direction based on the posture correction information transmitted from the projector 1.

  For example, assuming that the posture correction information transmitted from the multi-projection display 100 is an instruction to tilt the screen SCR forward by a predetermined angle, as shown in FIG. The posture correction control of the screen SCR is performed such that the screen is tilted forward (in the direction of arrow a) with respect to the support base 22.

  Thus, the orientation sensor 161 is provided in each projector 1 of the multi-projection display 100, and based on the orientation detection information obtained thereby, the orientation of the screen SCR can be controlled as well as the orientation control of the projector 1 itself. As a result, even when the multi-projection display 100 and the screen SCR are installed under various conditions, optimal projection is possible.

  Thereby, for example, even when it is desired to install the screen tilted for various reasons such as outside light and room light, the screen can be brought into an optimal installation state by an instruction from the multi-projection display side.

  The orientation sensor 161 may be provided not only on the projector 1 side but also on the housing 102 of the multi-projection display 100.

  In the third embodiment, since a plurality of image sensors 141 and a plurality of azimuth sensors 161 are provided on the multi-projection display 100 side, captured image information and a plurality of image information from the plurality of image sensors 141 are provided. By using the attitude detection information from the direction sensor 161, even when the frame SCR of the screen SCR is not present (including the case where the frame F is not recognized), the shape of the projected image is corrected, and the attitude of each projector 1 Correction and screen SCR attitude correction are possible.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described second and third embodiments, the four projectors 1 are arranged in a 2 × 2 arrangement, but the present invention is not limited to such an arrangement. For example, the present invention can also be applied to a case where nine projectors 1 are used and tiling projection is performed by using these nine projectors 1 as an array of 3 × 3 units.

  6, 9, and 10 used in the description of the second and third embodiments described above, an example in which the control unit 11, the correction parameter storage unit 15, and the like are provided separately from the projector 1 is shown. However, these components can also be incorporated in the projector 1.

  In that case, all the projectors 1 that perform tiling projection have these components, and one of them may perform the function described in the above-described embodiment. Of the plurality of projectors 1 to be performed, only one unit may include these components, and the projector may serve as a host computer. Further, the video signal receiving unit 12, the adjustment image information storage unit 13, and the like can be provided in one of the plurality of projectors 1 that performs tiling projection.

  Further, the azimuth sensor 161 may be provided only on the housing 102 of the multi-projection display 100 without being provided on each projector 1 side, and it is possible to obtain a certain effect.

1 is a diagram showing an external configuration of a projector according to a first embodiment of the invention. FIG. 3 is a configuration diagram illustrating functions of the projector according to the first embodiment. The figure explaining the example which correct | amends the shape distortion at the time of installing an projector in the state inclined in the upward direction and the right direction, and projecting an image. The figure explaining the relationship between the projector and screen which show the projection state of FIG. FIG. 6 is a diagram illustrating a configuration of a multi-projection display according to a second embodiment. FIG. 5 is a configuration diagram illustrating functions of a multi-projection display according to a second embodiment. The figure explaining the example which correct | amends the shape distortion at the time of installing two projectors in the state inclined up and down, and projecting an image from each projector. The figure explaining the relationship between the projector and screen which show the projection state of FIG. FIG. 6 is a configuration diagram illustrating functions of a multi-projection display according to a third embodiment. It is a block diagram which shows the function of the screen apparatus of this invention in addition to FIG. The figure explaining an example of operation | movement of the screen apparatus by the attitude | position correction information transmitted from a multi-projection display.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 3 ... Projection lens, 11 ... Control part, 14 ... Imaging device, 16 ... Attitude detection apparatus, 100 ... Multi-projection display, 110 ... Screen frame detection part, 111 ... Shape correction information generation part, 112 ... Image information West: 113: Optical correction means, 114: Image information correction unit, 141: Image sensor, 161: Direction sensor, 200: Screen device, SCR: Screen, F: Screen frame, 1a, Ib: Projected image.

Claims (16)

Imaging means capable of imaging a predetermined range including a screen frame and outputting the captured image;
Screen frame detection means for detecting the frame of the screen from the captured image obtained by the imaging means;
A shape correcting unit capable of correcting the shape of the projected image based on the shape of the screen frame detected by the screen frame detecting unit and the shape of the projected image on the screen obtained from the captured image;
A projector comprising:   The shape of the projector according to claim 1, wherein shape correction information for correcting the shape of the projected image is generated based on the shape of the frame of the screen and the shape of the projected image on the screen obtained from the captured image. A correction information generation unit, wherein the shape correction unit matches the shape of the projected image on the screen with the shape of the frame of the screen based on the shape correction information generated by the shape correction information generation unit; A projector having a function of controlling the attitude of the projector so as to approximate it.   3. The projector according to claim 2, wherein shape correction instruction information for instructing what correction should be performed based on the shape correction information can be projected on the screen.   4. The projector according to claim 1, wherein the shape correction unit includes a posture correction unit capable of correcting a shape of the projection image by correcting a posture of the projector, and image processing by software processing. A projector having at least one of image correcting means capable of correcting the shape of a projected image, and correcting the shape of the projected image by at least one of the attitude correcting means and the image correcting means by software processing.   5. The projector according to claim 1, wherein the attitude detection means is capable of detecting the attitude of the projector and outputting the attitude information of the projector, and based on the attitude information of the projector obtained by the attitude detection means. A projector further comprising attitude correction information generating means capable of generating attitude correction information for correcting the attitude of at least one of the projector and the screen.   6. The projector according to claim 5, further comprising an attitude correction information transmitting unit capable of transmitting the attitude correction information generated by the attitude correction information generating means to the screen. Imaging means capable of imaging a predetermined range including a screen frame and outputting the captured image, screen frame detection means for detecting the screen frame from a captured image obtained by the imaging means, and the screen frame detection means A projection image correction method for a projector having shape correction means capable of correcting the shape of the projected image based on the shape of the frame of the screen detected in step 1 and the shape of the projected image on the screen obtained from the captured image. There,
Detecting a frame of the screen from the captured image;
Correcting the shape of the projected image based on the shape of the frame of the screen detected by the step and the shape of the projected image on the screen obtained from the captured image;
A projected image correction method for a projector, comprising: A multi-projection display having unit image information generating means capable of generating a plurality of unit image information and a plurality of projectors for projecting unit images based on the unit image information generated by the unit image information generating means,
Imaging means capable of imaging a predetermined range including a screen frame and outputting the captured image;
Screen frame detection means for detecting the frame of the screen from the captured image obtained by the imaging means;
A shape correcting means capable of correcting the shape of the projected image based on the shape of the screen frame detected by the screen frame detecting means and the shape of the projected image on the screen obtained from the captured image;
A multi-projection display comprising:   9. The multi-projection display according to claim 8, wherein the imaging means is provided in a housing of the multi-projection display.   10. The multi-projection display according to claim 8, wherein the imaging unit is provided in each projector.   11. The multi-projection display according to claim 8, wherein the multi-projection display is capable of detecting the attitude of the multi-projection display and outputting the attitude information of the multi-projection display, and the attitude detection unit. A multi-projection display further comprising posture correction information generating means for generating posture correction information for correcting the posture of at least one of the multi-projection display and the screen based on posture information of the multi-projection display.   12. The multi-projection display according to claim 11, wherein the posture detection means is provided in a housing of the multi-projection display.   13. The multi-projection display according to claim 11, wherein the posture detection means is provided in each projector.   14. The multi-projection display according to claim 11, further comprising an attitude correction information transmitting unit capable of transmitting the attitude correction information generated by the attitude correction information generating means to the screen. Multi-projection display. Unit image information generating means capable of generating a plurality of unit image information, a plurality of projectors for projecting unit images based on the unit image information generated by the unit image information generating means, and capturing a predetermined range including a screen frame Imaging means capable of outputting the captured image, screen frame detection means for detecting the frame of the screen from the captured image obtained by the imaging means, and the shape of the screen frame detected by the screen frame detection means A projection image correction method for a multi-projection display, comprising: and a shape correction unit capable of correcting the shape of the projection image based on the shape of the projection image on the screen obtained from the captured image,
Detecting a screen frame for detecting a frame of the screen from the captured image;
Correcting the shape of the projected image based on the shape of the frame of the screen detected in the step and the shape of the projected image on the screen obtained from the captured image;
A projection image correction method for a multi-projection display, comprising:   A screen device having a screen for displaying a projection image projected from the projector according to claim 6 or the multi-projection display according to claim 14, wherein the screen device is based on attitude correction information transmitted from the attitude correction information transmitting unit. A screen device comprising: a posture correction control unit that performs posture correction control; and a screen operation unit that corrects the posture of the screen by the control by the posture correction control unit.