JP2009302814A - Imaging control device and method of imaging apparatus, and projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To output picked up image data in which capability of an imaging apparatus is effectively used when a projected image is picked up and its picked up image data is output. <P>SOLUTION: This imaging controller of the imaging apparatus controls the imaging apparatus 200 which picks up the projected image from a projector 100, which is projected on a projection surface (screen SCR), and has: a projection parameter acquisition part 310 which acquires at least one of a projection range setting parameter for setting a projection range of the projected image and a projection position setting parameter for setting a projection position of the projected image as a projection parameter; and an imaging apparatus control part 330 which acquires at least one of an imaging range setting parameter for setting an imaging range of the imaging apparatus 200 and an imaging position setting parameter for setting an imaging position of the imaging apparatus 200 as an imaging parameter based on the projection parameter acquired by the projection parameter acquisition part 310, and provides the acquired imaging parameter to the imaging apparatus 200. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an imaging control apparatus, an imaging control method, and a projection system for an imaging apparatus that controls an imaging apparatus that captures an image projected from a projector projected onto a projection surface.

  In a front projection type projection system that projects an image from the surface side of the screen as a projection surface due to the characteristic of projecting an image, the projector blocks the projection light when the viewer stands in front of the screen. There are challenges. On the other hand, in the rear projection type projection system that projects an image from the back side of the screen, this problem can be solved, but a space for increasing the projection distance is required on the back side of the screen. There is a problem that space is required.

  Accordingly, a proximity projection type projection system has been developed in which a projector is installed at a position close to the screen and projection is performed from the projector onto the screen. According to such a proximity projection type projection system, even if the viewer stands in front of the screen, the projection light is not blocked, and a large space is not required for constructing the projection system. A feeling of use close to that of a flat panel type image display device can be obtained.

  As shown in FIG. 1, the proximity projection type projection system is often configured to install the projector 100 immediately before the screen SCR and close to the lower end of the screen SCR. In this case, the viewer's line-of-sight direction is generally perpendicular to the screen SCR.

  In such a proximity projection type projection system, since the incident angle of the projection light from the projector 100 with respect to the screen SCR is an acute angle, the image projected from the projector 100 onto the screen SCR is viewed from the viewing direction of the viewer. It is necessary to perform image correction such as shape correction so that the image is correctly displayed on the screen. There are various techniques for not only a proximity projection type projection system but also a general projection system in which a projection image projected on a screen is captured by an imaging device and image correction is performed based on captured image data output from the imaging device. It has been proposed (see, for example, Patent Document 1).

JP 2000-241874 A

  When image correction is performed based on captured image data, the captured image data used for image correction is captured in a state where the imaging range and imaging position of the imaging device are appropriately set with respect to the projection range and projection position of the projected image. The captured image data is important for highly accurate correction.

  However, in the prior art, the imaging range and imaging position of the imaging device are set so that the projection range and projection position assumed in advance can be imaged on the screen. For this reason, in the prior art, when a change occurs in the projection range of the projection image to be corrected or a change occurs in the projection position, there is a problem that it cannot cope with it.

  One of the features of the projector is that the projection range and the projection position on the screen can be freely changed by a zoom function or a lens shift function. For this reason, the projection range and projection position of the projection image to be corrected may change. In such a case, the imaging range and imaging position of the imaging device are appropriately set with respect to the projection range and projection position of the projection image. If the image is not taken, the captured image data may be image data whose data amount is insufficient with respect to the projection image to be corrected, or image data in which the resolution of the imaging device is not effectively utilized. .

  That is, when the projection range is changed by the zoom function of the projector and the changed projection range becomes larger than the imaging range set by the imaging device, there is an area that is not captured in the projected image. Thus, the image data is insufficient with respect to the projection image to be corrected. Conversely, when the projection range after the change is too small compared to the imaging range set by the imaging device, the image data contains a lot of unnecessary data and is captured for the projection image to be corrected. This results in image data in which the resolution of the apparatus is not effectively utilized.

  In addition, the projection position may change due to the lens shift function. If the projection position changes, the projection position may deviate from the imaging position set in the imaging device. In this case as well, there is a region that is not captured in the projection image, and the projection image to be corrected However, the image data is insufficient.

  As described above, when the captured image data is image data whose data amount is insufficient with respect to the projection image to be corrected or the image data in which the resolution of the imaging device is not effectively utilized, a highly accurate image is obtained. It cannot be corrected. Therefore, even when the projection range and the projection position of the projection image to be corrected change, the imaging range and the imaging position of the imaging device are appropriately set with respect to the projection range and the projection position of the projection image. is important.

  Therefore, the present invention provides an imaging control device and an imaging device for an imaging device that enables imaging in an appropriate imaging range and imaging position corresponding to changes in the projection range and projection position of the projected image when the projection image is captured by the imaging device. An object is to provide a control method and a projection system.

  An imaging control device of an imaging device of the present invention is an imaging control device of an imaging device that controls an imaging device that captures a projection image from a projector projected on a projection surface, and sets a projection range of the projection image. Based on the projection parameter acquired by the projection parameter acquisition unit, the projection parameter acquisition unit that acquires at least one of the projection range setting parameter and the projection position setting parameter for setting the projection position of the projection image as a projection parameter, At least one of an imaging range setting parameter for setting an imaging range of the imaging device and an imaging position setting parameter for setting an imaging position of the imaging device is acquired as an imaging parameter, and the acquired imaging parameter is acquired by the imaging And an image pickup apparatus control unit to be provided to the apparatus.

As described above, in the present invention, the imaging of the projection image is performed after setting at least one of the imaging range and the imaging position of the imaging device according to at least one of the projection range and the projection position of the projection image projected on the projection surface. Can be done. Thereby, when a projection image is imaged by the imaging device, it is possible to capture an image in an appropriate imaging range or imaging position corresponding to a change in the projection range or projection position of the projection image. By performing such imaging control on the imaging device, the captured image data obtained from the imaging device becomes imaging data when the projection image is captured in an appropriate imaging range or imaging position. Such captured image data By performing image correction using, high-accuracy image correction is possible.

  In the imaging control device of the imaging apparatus of the present invention, it is preferable that the projection range setting parameter is a zoom value, and the projection position setting parameter is a lens shift value.

  The zoom value and the lens shift value are values that can be set by the user, and when these values are set by the user, the projection range of the projected image on the projection surface, and the like are set according to the set zoom value and lens shift value. The projection position changes. As described above, the projection range and the projection position change every time the zoom value and the lens shift value are set by the user. According to the present invention, the imaging range of the imaging apparatus is determined according to the projection range and the projection position at that time. And the imaging position can be set appropriately. This means that the zoom value and the lens shift value can be set without much consideration of the imaging range and imaging position of the imaging device, and the effect that flexible projection is possible is also obtained.

  In the imaging control device of the imaging device of the present invention, the imaging control device has an imaging parameter acquisition table capable of acquiring the imaging parameter from the projection parameter, and the imaging device control unit refers to the imaging parameter acquisition table, and It is preferable that the imaging parameter corresponding to the projection parameter set in the projector is acquired.

  By using such an imaging parameter acquisition table, an appropriate imaging parameter corresponding to the projection parameter can be easily acquired with a small amount of calculation. As the imaging parameter acquisition table, for example, a table capable of acquiring the imaging position setting parameter of the imaging apparatus from the projection range setting parameter of the projector, and the imaging range setting parameter of the imaging apparatus can be acquired from the projection range setting parameter of the projector. Various tables such as a table and a table from which the imaging position setting parameter of the imaging apparatus can be acquired from the projection position setting parameter of the projector can be created.

  In the imaging control device of the imaging apparatus of the present invention, it is preferable that the imaging range setting parameter is a parameter for changing the imaging range so that the imaging range matches or substantially matches the projection range.

  By setting the imaging range with such imaging range setting parameters, the imaging range can be matched or substantially matched with the projection range. As described above, the captured image data obtained by capturing the projection image in a state where the imaging range matches or substantially matches the projection range is the captured image data in which the resolution of the imaging device is effectively utilized. can do. As described above, it is possible to perform high-precision correction by correcting the projection image using the captured image data in which the resolution of the imaging apparatus is effectively utilized. In particular, when the projection image is reduced, the imaging range of the imaging device is reduced in accordance with the reduced projection image, so that captured image data having a higher resolution per unit area of the projection image can be obtained. This makes it possible to perform image correction with higher accuracy.

  In the imaging control device of the imaging apparatus of the present invention, the imaging position setting parameter is a parameter for changing the imaging position so that the center of the imaging range matches or substantially matches the center of the projection range. preferable.

By setting the image pickup position with such an image pickup position setting parameter, the center of the image pickup range can be matched or substantially matched with the center of the projection range. For this reason, an area with less lens distortion can be set as an imaging range. As described above, by imaging an area with less lens distortion as an imaging range, the captured image data obtained thereby can be captured image data with less influence of lens distortion. By using captured image data that is less affected by lens distortion in this manner, for example, projections and depressions on the projection surface can be grasped with high accuracy, and therefore high-accuracy image correction is possible.

  In the imaging control apparatus of the imaging apparatus according to the aspect of the invention, it is preferable that the projector is installed at a position close to the projection surface and that the projection light is projected at an acute angle with respect to the projection surface. .

  This is a so-called proximity projection type projection system, and in such a proximity projection type projection system, the projection image projected on the projection surface generally has a trapezoidal distortion, and the projection surface There is a problem that the projected image is easily distorted due to the influence of unevenness of the projection surface due to existing “wrinkles”. Therefore, in the proximity projection type projection system, it is indispensable to perform image correction for obtaining an appropriate image when the viewing direction is mainly the vertical direction with respect to the projection surface, and such image correction is performed. The present invention is extremely effective in obtaining captured image data necessary at the time.

  An image pickup control method for an image pickup apparatus according to the present invention is an image pickup control method for an image pickup apparatus that controls an image pickup apparatus that picks up a projection image from a projector projected on a projection surface, and sets a projection range of the projection image. A step of acquiring at least one of a projection range setting parameter and a projection position setting parameter for setting a projection position of the projection image as a projection parameter, and the imaging device based on the projection parameter acquired by the projection parameter acquisition unit At least one of an imaging range setting parameter for setting the imaging range and an imaging position setting parameter for setting the imaging position of the imaging device is acquired as an imaging parameter, and the acquired imaging parameter is given to the imaging device And a step.

  By performing imaging control of the imaging apparatus in such steps, it is possible to perform imaging in an appropriate imaging range and imaging position corresponding to changes in the projection range and projection position of the projected image. As described above, it is possible to perform high-accuracy correction by performing image correction of a projected image using captured image data captured in an appropriate imaging range or imaging position. Note that the imaging control method of the imaging apparatus of the present invention preferably has the respective characteristics of the imaging control device of the imaging apparatus of the present invention.

  The projection system of the present invention is a projection system that displays a projection image from a projector on a projection surface, and has a function of capturing the projection image projected on the projection surface, and an imaging range and an imaging position on the projection surface. An imaging device having a function of changing at least one of the imaging device and an imaging control device that controls the imaging device, wherein the imaging control device sets a projection range setting parameter for setting a projection range of the projection image, and A projection parameter acquisition unit that acquires at least one of the projection position setting parameters for setting the projection position of the projection image as a projection parameter, and an imaging range of the imaging device based on the projection parameter acquired by the projection parameter acquisition unit Imaging range setting parameter for setting and imaging position of the imaging device An imaging device control unit that acquires at least one of the imaging position setting parameters for setting the imaging parameter as an imaging parameter and applies the acquired imaging parameter to the imaging device, and the imaging device includes the imaging device control unit The at least one of the imaging range and the imaging position is controlled by the imaging parameter given from the above.

According to the projection system of the present invention, imaging of the imaging device is set so that at least one of the imaging range and imaging position of the imaging device is set according to at least one of the projection range and the projection position of the projection image projected on the projection surface. An imaging control device that performs control is included. By having such an imaging control device, the imaging device can perform imaging in an appropriate imaging range and imaging position corresponding to changes in the projection range and projection position of the projected image. And in a projector, highly accurate correction | amendment is attained by performing the image correction of a projection image using the captured image data imaged in the suitable imaging range and imaging position. As a result, a projection system capable of displaying a high-quality image can be realized. Note that the projection system of the present invention preferably has the respective characteristics of the imaging control device of the imaging device of the present invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a diagram showing a schematic configuration of a projection system according to an embodiment of the present invention. FIG. 1 (a) is a side view and FIG. 1 (b) is a front view. In the projection system according to the embodiment of the present invention, as shown in FIG. 1, the projector 100 is positioned close to the projection surface (referred to as the screen SCR), and the incident angle of the projection light with respect to the screen SCR becomes an acute angle. It is assumed that this is a so-called proximity projection type projection system installed. Further, in the proximity projection type projection system according to the embodiment of the present invention, in addition to the projector 100, an imaging device 200 for capturing a projection image from the projector 100 projected on the screen SCR, and the imaging device 200. An imaging control apparatus 300 having a function of performing imaging control is included.

  Note that the imaging control apparatus 300 can use a personal computer or the like. However, if there is a control unit on the projector 100 side that can perform processing necessary for realizing the present invention, such as analysis of captured image data and control of the imaging apparatus 200, the control unit is controlled by imaging control. Since it can be used as a device, it is not particularly necessary to provide the imaging control device 300 separately from the projector 100.

  The installation position of the imaging device 200 is not particularly limited as long as it can capture a projected image on the screen SCR. However, it is preferable to install the imaging apparatus 200 at a position where a viewer or the like does not enter the imaging range. . Therefore, in the embodiment of the present invention, it is assumed that the imaging device 200 is installed at substantially the same position as the projector 100 as shown in FIG.

  The imaging apparatus 200 is provided with a zoom mechanism (not shown) and an imaging position variable mechanism (not shown) for setting the imaging range. The zoom mechanism is a mechanism for enlarging / reducing the imaging range. The imaging position variable mechanism is a mechanism that can drive the imaging apparatus 200 so as to shift the imaging position in the vertical direction and the horizontal direction on the screen SCR without changing the installation position of the imaging apparatus 200. An example is a mechanism that can tilt the apparatus main body in an up-down direction and a left-right direction by an arbitrary angle within a predetermined range.

  FIG. 2 is a block diagram illustrating functions of the projection system shown in FIG. The projector 100 includes an image data input unit 110 that inputs image data corresponding to an image to be projected, an image projection unit 120 that emits image data input to the image data input unit 110 as image light, and a projection range setting. User interface unit that can input various parameters (referred to as projection parameters) necessary for projection, such as parameters for performing projection (referred to as projection range setting parameters) and parameters for performing projection position settings (referred to as projection position setting parameters) 130, a projection parameter holding unit 140 that holds projection parameters (projection range setting parameters and projection position setting parameters) input by the user, and image data input to the image data input unit 110 from the imaging device 200. Based on the output captured image data And an image correction unit 150 performs various corrections such as shape correction and distortion correction.

The projection range setting parameter is a zoom value, and the projection position setting parameter is a lens shift value. Therefore, when a projection range setting parameter is input by the user, a zoom mechanism (not shown) operates according to the input projection range setting parameter, and when a projection position setting parameter is input by the user, A lens shift mechanism unit (not shown) operates according to the projected position setting parameter.
Moreover, since the image projection part 120 has well-known components, such as a light source, a light modulation element, and various lenses, illustration is abbreviate | omitted about these components.

  The imaging control device 300 acquires a projection parameter acquisition unit 310 that acquires a projection parameter stored in the projection parameter storage unit 140 of the projector 100, and an imaging range of the imaging device 200 from the projection parameter acquired by the projection parameter acquisition unit 310. An imaging parameter acquisition table 320 that can acquire at least one of a parameter for setting (referred to as an imaging range setting parameter) and a parameter for setting an imaging position of the imaging apparatus 200 (referred to as an imaging position setting parameter) as an imaging parameter. The imaging parameter (at least one of the imaging range setting parameter and the imaging position setting parameter) is acquired by referring to the imaging parameter acquisition table 320 from the projection parameter acquired by the projection parameter acquisition unit 310 and acquired. An imaging device control unit 330 that gives image parameters to the imaging device 200, and a captured image data processing unit that acquires captured image data captured by the imaging device 200, performs predetermined processing such as image data analysis, and outputs the processed image data to the projector 100 340.

  The imaging apparatus 200 includes an imaging unit 210 having a lens, an imaging element, and the like, a captured image data output unit 220 that outputs captured image data obtained by the imaging unit 210, and a zoom mechanism that controls a zoom mechanism (not shown). It has a control unit 230 and an imaging position variable mechanism control unit 240 that controls an imaging position variable mechanism (not shown).

  The zoom mechanism control unit 230 and the imaging position variable mechanism control unit 240 operate based on imaging parameters given from the imaging device control unit 330 of the imaging control device 300. In other words, when an imaging range setting parameter is given as an imaging parameter from the imaging device control unit 330 to the zoom mechanism control unit 230, the zoom mechanism control unit 230 uses the zooming mechanism (FIG. (Not shown). Thereby, the imaging range changes by an amount corresponding to the imaging range setting parameter. Further, when an imaging position setting parameter is given as an imaging parameter from the imaging device control unit 330 to the imaging position variable mechanism control unit 240, the imaging position variable mechanism control unit 240 uses the given imaging position setting parameter. An imaging position variable mechanism (not shown) is controlled. As a result, the imaging position changes by an amount corresponding to the imaging position setting parameter.

  By the way, in the proximity projection type projection system as shown in FIG. 1, the projector 100 is installed in the proximity position of the screen SCR, and is installed so that the incident angle of the projection light with respect to the screen becomes an acute angle. For this reason, the projected image on the screen SCR has a trapezoidal distortion, and when the screen SCR has irregularities, the irregularities cause distortion in the projected image. Therefore, it is necessary to perform shape correction (keystone correction) or distortion correction caused by the unevenness of the screen SCR on the projected image.

  Such correction is performed by the image correction unit 150 of the projector based on the captured image data obtained by the imaging apparatus 200 capturing the projected image on the screen SCR. At this time, the captured image data used for the image correction may be captured image data captured in a state where the imaging range and imaging position of the imaging apparatus 200 are appropriately set with respect to the projection range and projection position of the projection image. This is important for highly accurate correction.

  FIG. 3 is a diagram for explaining the shape correction of the projected image on the screen SCR in the proximity projection type projection system shown in FIG. FIG. 3A shows a projection range of a projected image on the screen SCR before shape correction, and a region A shown in dark gray is the projection range, and trapezoidal distortion occurs. FIG. 3B is an example of shape correction (keystone correction) of FIG. 3A, and an effective projection range after shape correction is indicated by a dark gray area A ′. It should be noted that the area (area B shown in light gray) other than the effective projection range (dark gray area A ′) is an area where “black” is projected.

  FIG. 4 is a diagram for explaining the distortion generated in the projection image due to the unevenness of the screen SCR in the proximity projection type projection system shown in FIG. As shown in FIG. 4, if the screen SCR has irregularities (projections h in FIG. 4), the projection image is distorted in the projections h. That is, the pixel image to be projected at the position P1 in FIG. 4 is actually projected at the position P1 ′ of the convex portion h of the screen SCR, and the viewer's line-of-sight direction is the vertical direction of the screen SCR. If there is, the projected image is distorted at the convex portion h of the screen SCR. Although FIG. 4 shows the case where the convex portion h is present on the screen SCR, distortion occurs similarly when the concave portion is present.

  When the shape correction and distortion correction of the projected image on the screen SCR are performed based on the captured image data obtained by the imaging device 200, as described above, the imaging device 200 performs the projection range and the projection position of the projected image. It is important to use captured image data captured in a state where the imaging range and imaging position are appropriately set.

  Here, for example, a case will be described in which, after performing shape correction as shown in FIG. 3B, for example, distortion correction due to unevenness of the screen as shown in FIG. 4 is performed. At this time, it is assumed that the projection range is changed by changing the zoom value of the projector 100 without changing the imaging range of the imaging device 200.

  FIG. 5 is a diagram for explaining a case where the projection range of the projector is changed without changing the imaging range of the imaging apparatus 200. FIG. 5 shows an example in which the projection range setting parameter (zoom value) is set so as to reduce the projected image. In FIG. 5, the area surrounded by the thick line frame L indicates the projection range of the projection image before reduction, and the white area C indicates the projection range of the projection image after reduction.

  In the proximity projection type projection system, when the zoom value of the projector 100 is changed, the center position of the projection range moves up and down on the screen SCR. In this case, since the zoom value is changed in the reduction direction, the center position of the projection range after reduction on the screen SCR moves downward in the screen SCR. That is, in FIG. 5, the center Po of the projection range before reduction moves to Po ′ after reduction.

  Here, it is assumed that the imaging range of the imaging apparatus 200 is set to the same range as the projection range before reduction (the region surrounded by the thick line frame L in FIG. 5), and the imaging range is held as it is without being changed. The region other than the projected image (outlined region C) in FIG. 5 (the region D shown in gray) is also taken as the imaging range, and the resolution of the imaging device 200 is effectively used for the obtained captured image data. It will not be the captured image data.

Further, in the example of FIG. 5, the center Po of the imaging range of the imaging apparatus 200 and the center Po ′ of the projection range do not coincide with each other, and “deviation” occurs. In general, since the lens has more lens distortion in the peripheral portion than in the central portion, the captured image data corresponding to the region near the outer peripheral portion of the imaging range of the imaging device 200 may include distortion of the lens of the imaging device. In some cases, the unevenness of the screen cannot be accurately grasped. For this reason, it is preferable to make an imaging range an area with less lens distortion. In order to realize this, it is preferable to shift the imaging position of the imaging device 200 so that the center of the imaging range of the imaging device 200 matches or substantially matches the center of the projection range.

  The imaging position of the imaging apparatus 200 can be shifted by controlling the imaging position variable mechanism (not shown) by the imaging position variable mechanism control unit 240. As described above, the imaging position variable mechanism is a mechanism that can drive the imaging apparatus 200 so as to shift the imaging position in the vertical direction and the horizontal direction without changing the installation position of the imaging apparatus 200. The imaging range of the imaging apparatus 200 can be shifted by a predetermined amount by the imaging position variable mechanism.

  FIG. 6 is a diagram illustrating an example in which the imaging position of the imaging device 200 is shifted downward in the screen SCR so that the center Po of the imaging range of the imaging device 200 coincides with the center Po ′ of the projection image. In this way, by capturing the projection image on the screen SCR in a state where the center Po of the imaging range of the imaging device 200 coincides with the center Po ′ of the projection image, the captured image data becomes the lens distortion of the imaging device 200. The captured image data can be reduced. By correcting the projection image based on such captured image data with little lens distortion, the unevenness of the screen SCR can be grasped with high accuracy, so that highly accurate correction can be performed.

  In addition to shifting the imaging position of the imaging device 200, the imaging mechanism can be changed by controlling the zoom mechanism (not shown) by the zoom mechanism control unit 230 of the imaging device 200.

  FIG. 7 is a diagram illustrating a case where the imaging range of the imaging apparatus 200 is changed in the example shown in FIG. In FIG. 7, the zoom mechanism control unit 230 of the imaging apparatus 200 causes the zoom mechanism (not shown) so that the imaging range (area surrounded by the thick line frame L) is slightly larger than the projected image (outline area C). Z)). As described above, by setting the imaging range to be slightly larger than the projection range, captured image data that effectively uses the resolution of the imaging device 200 can be obtained, and high-accuracy correction can be performed. In the example of FIG. 7, the imaging range of the imaging apparatus 200 is set to be slightly larger than the projection range, but the imaging range may be set so that the imaging range and the projection range match.

  The above is the case where the projection range is changed using the zoom mechanism of the projector 100. However, when the projector 100 is provided with a lens shift mechanism, the projection position may be changed by the lens shift mechanism. Even when the projection position is changed by the lens shift mechanism, it is possible to change the imaging range or imaging position of the imaging apparatus 200 in accordance with the change of the projection position.

  By the way, when controlling the zoom mechanism control unit 230 and the imaging position variable mechanism control unit 240 of the imaging apparatus 200 so as to correspond to the change of the projection range by the zoom mechanism of the projector 100 and the change of the projection position by the lens shift mechanism. The imaging parameter (at least one of the imaging range setting parameter and the imaging position setting parameter) corresponding to the projection parameter (at least one of the projection range setting parameter and the projection position setting parameter) set in the projector 100 is acquired, and the acquired imaging At least one of the zoom mechanism control unit 230 and the imaging position variable mechanism control unit 240 of the imaging apparatus 200 is controlled by a parameter (at least one of the imaging range setting parameter and the imaging position setting parameter). In the embodiment of the present invention, such control can be performed by the imaging control apparatus 300 shown in FIG.

For example, assuming that a certain value of the projection range setting parameter is newly input by the user on the projector 100 side, the input projection range setting parameter is held in the projection parameter holding unit 140. On the other hand, in the imaging control device 300, the projection parameter acquisition unit 310 acquires the projection parameter newly held in the projector 100 (in this case, the projection range setting parameter), and gives the acquired projection parameter to the imaging device control unit 330. .

  The imaging device control unit 330 refers to the imaging parameter acquisition table 320 from the projection range setting parameters acquired by the projection parameter acquisition unit 310 and controls imaging parameters (for example, imaging position setting parameters) for controlling the imaging device 200. And the acquired imaging position setting parameter is given to the imaging position variable mechanism control unit 240 of the imaging apparatus 200. Thereby, on the side of the imaging apparatus 200, the imaging position variable mechanism (not shown) operates by the control of the imaging position variable mechanism control unit 240, and the imaging position is shifted.

  FIG. 8 is a diagram illustrating an example of the imaging parameter acquisition table. The imaging parameter acquisition table shown in FIG. 8 corresponds to each zoom value as a projection range setting parameter that can be set by the projector 100 and an up / down direction shift value as an imaging position setting parameter for determining the imaging position of the imaging device 200. It is a table attached. For example, the zoom value “+8” of the projector 100 is set as a reference value, the vertical shift value of the imaging apparatus 200 at that time is set to “0”, and the zoom value of the projector 100 becomes larger in the plus direction than the reference value. The shift value of the imaging device 200 is set so as to increase in the plus direction (the upward direction of the screen SCR).

  The vertical shift value of the imaging apparatus 200 in FIG. 8 means the vertical movement amount of the imaging position on the screen SCR, and the vertical shift acquired by the imaging parameter acquisition table in FIG. By giving the value to the imaging position variable mechanism control unit 240 as an imaging position setting parameter, the imaging position of the imaging apparatus 200 is shifted upward or downward by the vertical shift value.

  Such an imaging parameter acquisition table is a table shown in FIG. 8, that is, a table from which the imaging position setting parameter (vertical shift value) of the imaging apparatus 200 can be acquired from the projection range setting parameter (zoom value) of the projector 100. In addition, for example, a table from which the imaging range setting parameter (zoom value) of the imaging apparatus 200 can be acquired from the projection range setting parameter (zoom value) of the projector 100, and the projection position setting parameter (lens shift in the vertical and horizontal directions) of the projector 100 Values), a table capable of acquiring imaging parameters of the imaging apparatus 200 corresponding to various projection parameters of the projector 100, such as a table capable of acquiring imaging position setting parameters (shift values in the vertical and horizontal directions) of the imaging apparatus 200, respectively. Can be createdBy creating such various imaging parameter acquisition tables, it is possible to easily acquire imaging parameters of the imaging apparatus 200 corresponding to the projection parameters of the projector 100 that are currently set.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the imaging parameters on the imaging device 200 side are acquired by referring to an imaging parameter acquisition table as shown in FIG. Can also be generated dynamically.

  FIG. 9 is a diagram illustrating an example in which imaging parameters are dynamically generated. Various known algorithms can be used as a method for dynamically generating imaging parameters. An example of this will be described with reference to FIG.

First, as shown in FIG. 9A, from an imaged image data obtained by imaging an imaging range (a region surrounded by a thick frame L) including a projected image (outlined region C), an imaging range ( The area surrounded by the thick line frame L) is divided into several areas (for example, 4 divisions) as shown by the broken line in FIG. 9B, and a background image (in this case, a screen) is divided for each divided area. By taking the difference from the image corresponding to the SCR, it is determined whether or not the area is the projection range of the projection image.

  Then, the entire projection range is estimated from the determination result, and the position of the projection range (outlined region C) is specified. When the position of the projection range can be specified, an imaging position setting parameter is calculated so that the center of the imaging range of the imaging apparatus 200 can be matched or substantially matched with the center of the projection range. Then, the calculated imaging position setting parameter is given to the imaging position variable mechanism control unit 240, whereby the imaging position variable mechanism control unit 240 controls the imaging position variable mechanism.

  Further, if necessary, an imaging range setting parameter is calculated so that the imaging range of the imaging apparatus 200 can be substantially matched with the projection range. Then, the calculated projection range setting parameter is given to the zoom mechanism control unit 230, whereby the zoom mechanism control unit 230 controls the zoom mechanism. Thereby, the imaging range is controlled so as to substantially match the projection range (see FIG. 9C).

  As described above, by dynamically generating imaging parameters necessary for controlling the imaging device 200, the imaging range of the imaging device 200 and the projection range of the projection image of the projector 100 and the change in the projection position can be changed. The imaging position can be set optimally.

  In the above-described embodiment, the imaging apparatus 200 is externally attached to the projector 100. However, when the imaging apparatus 200 is built in the projector 100, the built-in imaging apparatus is used. Can do. In this case, the built-in imaging device needs to have a function capable of setting the zoom amount and setting the imaging position.

  In the above-described embodiment, the image correction unit is provided in the projector 100. However, when a personal computer is used as the imaging control device 300, part or all of the image correction can be performed on the personal computer side. .

  In the above-described embodiment, the proximity projection type projection system has been described as an example of the projection system. However, the present invention can be applied not only to the proximity projection type projection system but also to a general projection system. Of course.

The figure which shows schematic structure of the projection system which concerns on embodiment of this invention. The block diagram explaining the function of the projection system shown in FIG. The figure explaining the shape correction | amendment of the projection image on a screen in the proximity projection type | mold projection system shown in FIG. The figure explaining the distortion which arises in a projection image by the unevenness | corrugation on a screen in the proximity projection type | mold projection system shown in FIG. The figure explaining the case where the zoom amount of a projector is changed without changing the imaging range of an imaging device. The figure which shows the example which shifted the imaging position of the imaging device 200 to the downward direction of screen SCR so that the center Po of the imaging range of the imaging device 200 may correspond with the center Po 'of a projection image. The figure explaining the case where the imaging range of an imaging device is changed in the example shown in FIG. The figure which shows an example of the table for imaging parameter acquisition. The figure explaining the example which produces | generates an imaging parameter dynamically.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Projector, 130 ... User interface, 140 ... Projection parameter holding | maintenance part, 150 ... Image correction part, 200 ... Imaging device, 230 ... Zoom mechanism control part, 240 ... Imaging position variable mechanism control unit, 300 ... Imaging control device, 310 ... Projection parameter acquisition unit, 320 ... Imaging parameter acquisition table, 330 ... Imaging device control unit, SCR ... Screen, L ... thick line frame (imaging range), C ... projection range

Claims (8)

An imaging control device for an imaging device that controls an imaging device that captures a projection image from a projector projected onto a projection surface,
A projection parameter acquisition unit that acquires, as a projection parameter, at least one of a projection range setting parameter for setting a projection range of the projection image and a projection position setting parameter for setting a projection position of the projection image;
Based on the projection parameters acquired by the projection parameter acquisition unit, at least one of an imaging range setting parameter for setting the imaging range of the imaging device and an imaging position setting parameter for setting the imaging position of the imaging device is imaged An imaging device control unit that obtains the acquired imaging parameters as parameters and supplies the acquired imaging parameters to the imaging device;
An imaging control apparatus for an imaging apparatus, comprising: In the imaging control device of the imaging device according to claim 1,
The imaging control apparatus for an imaging apparatus, wherein the projection range setting parameter is a zoom value, and the projection position setting parameter is a lens shift value. In the imaging control device of the imaging device according to claim 1 or 2,
An imaging parameter acquisition table capable of acquiring the imaging parameters from the projection parameters is provided, and the imaging device control unit refers to the imaging parameter acquisition table and corresponds to the projection parameters set in the projector An imaging control apparatus for an imaging apparatus, wherein the imaging parameter is acquired. In the imaging control device of the imaging device according to any one of claims 1 to 3,
The imaging control device of an imaging apparatus, wherein the imaging range setting parameter is a parameter for changing the imaging range so that the imaging range matches or substantially matches the projection range. In the imaging control device of the imaging device according to any one of claims 1 to 4,
The imaging control apparatus according to claim 1, wherein the imaging position setting parameter is a parameter for changing the imaging position so that a center of the imaging range coincides with or substantially coincides with a center of the projection range. In the imaging control device of the imaging device according to any one of claims 1 to 5,
The image pickup control apparatus for an image pickup apparatus, wherein the projector is installed at a position close to the projection surface, and is installed so that projection light is projected at an acute angle with respect to the projection surface. An imaging control method for an imaging apparatus that controls an imaging apparatus that captures a projection image from a projector projected on a projection surface,
Obtaining at least one of a projection range setting parameter for setting a projection range of the projection image and a projection position setting parameter for setting a projection position of the projection image as a projection parameter;
Based on the projection parameters acquired by the projection parameter acquisition unit, at least one of an imaging range setting parameter for setting the imaging range of the imaging device and an imaging position setting parameter for setting the imaging position of the imaging device is imaged Obtaining as a parameter and providing the acquired imaging parameter to the imaging device;
An imaging control method for an imaging apparatus, comprising: A projection system for displaying a projection image from a projector on a projection surface,
An imaging device having a function of capturing the projected image projected on the projection surface and a function of changing at least one of an imaging range and an imaging position on the projection surface;
An imaging control device that controls the imaging device;
The imaging control device includes:
A projection parameter acquisition unit that acquires, as a projection parameter, at least one of a projection range setting parameter for setting a projection range of the projection image and a projection position setting parameter for setting a projection position of the projection image;
Based on the projection parameters acquired by the projection parameter acquisition unit, at least one of an imaging range setting parameter for setting the imaging range of the imaging device and an imaging position setting parameter for setting the imaging position of the imaging device is imaged An imaging device control unit that obtains the acquired imaging parameters as parameters and supplies the acquired imaging parameters to the imaging device;
Have
The imaging device
A projection system, wherein at least one of the imaging range and the imaging position is controlled by an imaging parameter given from the imaging device control unit.