JP2012127993A - Projector and screen shape correction method of projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector, and a screen shape correction method of a projector, which allow a user to intuitively and easily perform correction of a screen shape.SOLUTION: A projector includes a projection optical system 30 for displaying a correction screen showing the shape of a projection screen on a screen SC, a movement detection unit 16a for detecting movement of an object on the screen SC, and a screen shape correction unit 12a for deforming the shape of the correction screen and correcting the screen shape of the projection screen based on the movement of the object.

Description

  The present invention relates to a projector that displays a projection screen on a screen and a screen shape correction method for the projector.

  Conventionally, as a screen shape correction function of a projector, “keystone distortion correction” (for example, Patent Document 1) and “quick corner correction” (for example, Non-Patent Document 1) are known. The former keystone distortion correction is to perform distortion correction in the vertical and horizontal directions (vertical and horizontal directions). Usually, an operation panel provided in the main body of the apparatus or a remote controller (hereinafter referred to as remote controller) for remote operation is used. The correction operation is performed using the up / down / left / right buttons provided in the “remote control”. On the other hand, the latter “quick corner correction” performs distortion correction on each of the four corners of the projection screen. Select the corner to be corrected on the OSD (On Screen Display) screen, Perform the correction operation using the left and right buttons.

JP 2004-246242 A OFIRIO Projector EMP-1815 / 1810 Instruction Manual 2007 Edition p. 14-16 Epson Sales Co., Ltd.

  However, the method of correcting the image shape using the operation panel or the remote control as described above is troublesome because it is necessary to press the up / down / left / right button many times. In addition, when a remote controller is used, when a plurality of projectors are arranged close to each other (a so-called tiling display or multi-screen display that projects a large screen using a plurality of projectors is performed. For example), the projector other than the projector to be operated is affected.

  In view of the above problems, the present invention provides (1). Easy screen shape correction, (2). To provide a projector capable of realizing screen shape correction without affecting other projectors even when multiple projectors are arranged close to each other, and a method for correcting the screen shape of the projector With the goal.

  A projector according to the present invention is based on a projection display unit that displays a projection screen on a screen, an imaging unit that images a screen, a movement detection unit that detects the movement of an object from the imaging result of the imaging unit, and the movement of the object. And a screen shape correction unit for correcting the screen shape of the projection screen.

  The projector screen shape correction method of the present invention is a projector screen shape correction method for displaying a projection screen on a screen, the step of imaging the screen, and the step of detecting the movement of an object from the imaging result of the screen; And a step of correcting the screen shape of the projection screen based on the movement of the object.

According to these configurations, the screen shape of the projection screen can be corrected intuitively and easily by moving the object between the imaging unit and the screen (for example, on the screen). In addition, since image correction is performed by moving an object between the imaging unit and the screen, even when multiple projectors are arranged close to each other, screen shape correction can be performed without affecting other projectors. Can do.
The object may be any type, such as a human hand (finger), a pointing stick, or a marker (writing instrument). Further, the movement detection unit may detect an object that moves while being in contact with the screen, or may detect an object that moves without being in contact with the screen.

  In the projector described above, it is preferable that the movement detection unit detects a movement direction and a movement amount of the object.

  According to this configuration, the correction direction and the correction amount can be instructed based on the moving direction and moving amount of the object. As a result, a more intuitive correction operation is possible.

  In the projector described above, the movement detection unit determines a change in reflectance from a captured image that is an imaging result of the imaging unit by determining a change in reflectance due to the projection light from the projection display unit being blocked by the object. Is preferably detected.

  According to this configuration, since the movement of the object is detected from the change in reflectance, the detection is easy. Moreover, since the kind of object is not ask | required, correction | amendment operation can be performed using a familiar thing.

  In the projector described above, the projection display unit displays a rectangular area indicating the shape of the projection screen on the screen, and the movement detection unit is an object on the captured image based on the rectangular area displayed on the screen. It is preferable to detect the movement of.

  According to this configuration, it is only necessary to move the object with reference to the rectangular area displayed on the screen, so that the correction operation can be performed more easily.

  In the projector described above, the screen shape correction unit changes the position of the side and / or vertex of the rectangular area where the object is close or overlapped with the movement of the object, thereby changing the screen shape of the projection screen. It is preferable to correct.

  According to this configuration, the screen shape of the projection screen can be corrected with the feeling of moving the sides and vertex positions of the rectangular area. In addition, since the shape of the rectangular area (side and vertex positions) also changes with the correction operation, the operation can be performed while checking the correction result.

  In the projector described above, the projection display unit displays a plurality of marker images arranged at a plurality of positions including the four vertex positions of the rectangular region together with the rectangular region, and the movement detection unit passes over the marker image. It is preferable to detect the movement of the object.

According to this configuration, by displaying the marker image, the user can grasp to which part of the rectangular area the object should be moved. In addition, since the movement of the object that has passed over the marker image is detected, in other words, when the object does not pass over the marker image, image correction is not performed. Accordingly, it is possible to prevent the rectangular area from being deformed and image-corrected against the user's intention.
Note that the screen shape correction unit changes the position corresponding to the marker image through which the object has passed as the object moves. Thus, the user only has to move the object along the marker image corresponding to the position where the shape is desired to be changed, and can perform the correction operation more intuitively.
The movement detection unit may detect the movement of all the objects that have passed through the marker image area, but may limit the detection target area to the marker image area. That is, only the movement of the object in the marker image area may be detected. Further, the movement of an object having a movement start point and / or a movement end point in the marker image area may be detected.

  In the projector described above, it is preferable that the plurality of marker images include four corner regions that are inscribed in the four corners of the rectangular region and do not overlap each other.

  According to this configuration, since the marker image is provided corresponding to the four corners of the rectangular area, it is possible to display a projection screen without distortion by moving each of the marker images in an arbitrary direction. In addition, since the four marker images are inscribed in the rectangular area, the display of the marker image does not hinder the grasping of the shape of the rectangular area.

  The projector described above further includes a mode switching unit that switches between a correction mode for correcting the screen shape based on the movement of the object and a normal mode for projecting the projection screen, and the movement detection unit and the screen shape correction unit are It is preferable to function only in the correction mode.

  According to this configuration, since the screen shape can be corrected only in the correction mode, it is possible to prevent the screen shape from being corrected against the user's intention when displaying a normal projection image.

  In the projector described above, the movement detection unit can detect not only the movement of the object but also the movement of the point position using the pointing device on the screen, and the screen shape correction unit can move the object or the point position. It is preferable to correct the screen shape of the projection screen based on the movement of the body.

According to this configuration, the correction operation can be performed not only by moving the object but also by moving the point position on the screen by using the pointing device.
The pointing device may be of any type, such as a mouse, touch panel, track pad, touch pad, joystick, track ball, and various pointers. Further, the pointing device and the projector may be wired or may be wirelessly connected (such as infrared communication or short-range wireless communication). Further, it may be in a disconnected state (for example, when a laser pointer is used). In the case of a wired connection or a wireless connection, the connection may not be a direct connection, but may be an indirect connection via a personal computer or the like between the pointing device and the projector.

  In the projector described above, the projector further includes a moving body selection unit that detects whether the movement of the object or the movement of the point position is detected. Accordingly, it is preferable to detect the movement of the object or the point position.

  According to this configuration, since either the object or the point position to be moved is selected as the moving body, it is possible to perform appropriate movement detection according to the moving body.

  In the projector described above, the projection display unit may change at least one of the color, brightness, and size of the rectangular area and / or the marker image according to the selection result of the moving body selection unit. preferable.

  According to this configuration, since the aspect of the rectangular area and the marker image is changed according to the moving body, the operability of the correction operation can be improved and more appropriate movement detection can be performed.

  In the projector described above, when the movement of the point position is selected by the moving body selection unit, the mode switching unit preferably performs mode switching in accordance with a mode switching instruction using a pointing device.

According to this configuration, an appropriate mode switching method can be adopted depending on the moving body.
As a mode switching method, a method using a pointing device or a method using an operation panel or a remote control provided in the projector main body is conceivable. However, when “point position” is selected as the moving body, the pointing device is used. It is preferable to adopt a mode switching method using. When “object” is selected as the moving body, it is preferable to adopt a mode switching method using an operation panel or a remote control. As a mode switching method using a pointing device, the mode is switched when it is detected that the point position is superimposed on a specific area on the screen, or a specific line image is drawn by the movement locus of the point position. It is conceivable that mode switching is performed when the signal is detected. In this way, when performing screen shape correction based on the movement of an object, some object has blocked the front of the imaging unit by preventing mode switching by superimposing on a specific area or drawing a line image. As a result, it is possible to prevent problems such as erroneous mode conversion.

It is an image figure of the projection system which concerns on 1st Embodiment. It is explanatory drawing of a correction | amendment screen, and the block diagram of a pointer. It is a block diagram of a projector. It is explanatory drawing of correction operation which concerns on 1st Embodiment. It is a figure which shows the captured image which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the movement of the point position with respect to an adjustment marker. It is explanatory drawing for demonstrating the movement of a point position different from FIG. It is a flowchart which shows a screen shape correction process. It is explanatory drawing which shows the mode switching method. It is explanatory drawing which shows the mode switching method different from FIG. It is a figure which shows the modification of a marker image. It is a figure which shows the modification of a marker image different from FIG. It is an image figure of the projection system which concerns on 2nd Embodiment. It is explanatory drawing of correction operation which concerns on 2nd Embodiment. It is a figure which shows the captured image which concerns on 2nd Embodiment. It is explanatory drawing of the operation position which performs correction | amendment operation. It is a figure which shows the hierarchical structure of mode selection. It is a figure which shows an example of the correction | amendment screen according to selection mode.

[First Embodiment]
Hereinafter, a projector and a screen shape correction method for a projector according to an embodiment of the invention will be described with reference to the accompanying drawings. FIG. 1 is an image diagram of the projection system SY1 according to the first embodiment. As shown in the figure, the projection system SY1 includes a projector 1 that projects the projection screen 10, a pointer 2 that points to an arbitrary position on the projection screen 10, and a screen SC on which the projection screen 10 is projected. I have. Here, the projection screen 10 refers to the entire area (hereinafter referred to as “projection area”) where the projection light is projected onto the screen SC.

  The operator (user) projects the projection screen 10 on the screen SC by operating the operation panel 14 and the remote controller 15 (both see FIG. 3) provided in the projector 1 main body. Thereafter, a laser beam is irradiated from the pointer 2 to display a point position P (irradiation point) on the screen SC, and a presentation is given while pointing to an important part in the projected image. Note that an external device such as a personal computer is connected to the projector 1 as necessary, but the description thereof is omitted because it is not directly related to the present invention.

  By the way, the projector 1 according to the present embodiment can perform screen shape correction (such as keystone distortion correction) of the projection screen 10 using the pointer 2 described above. The screen shape correction is performed in a state where the normal mode for displaying the projection screen 10 is switched to the correction mode for performing the screen shape correction.

  FIG. 2A is a diagram showing a correction screen 20 (rectangular area) and an adjustment marker M (marker image) displayed on the screen SC in the correction mode. The correction screen 20 is a rectangular area having substantially the same aspect ratio as the projection screen 10, and, like the projection screen 10, trapezoidal distortion occurs due to the arrangement of the projector 1 with respect to the screen SC. The operator adjusts the shape of the correction screen 20 so as to eliminate this trapezoidal distortion, thereby performing the shape correction operation of the projection screen 10. The correction screen 20 may be a reduced size obtained by reducing the projection screen 10 (projection area), but preferably has substantially the same size as the projection screen 10. On the other hand, adjustment markers M having the same size and the same shape are displayed at the four corners of the correction screen 20, respectively. The operator uses the adjustment marker M to adjust the shape of the correction screen 20. The shape correction operation of the projection screen 10 will be described in detail later.

  Next, the hardware configuration of the pointer 2 and the projector 1 will be described with reference to FIG. FIG. 2B is a block diagram showing the configuration of the pointer 2. The pointer 2 includes a laser irradiation unit 21, a laser emission unit 22, and an operation unit 23. The operation unit 23 is a switch and switches ON / OFF. In addition, it is good also as a structure which comprises the operation part 23 with a button and continues irradiating a laser beam while pressing down. The laser emission unit 22 emits laser light according to the operation of the operation unit 23, and the laser light is irradiated by the laser irradiation unit 21.

  FIG. 3 is a block diagram showing the configuration of the projector 1. The projector 1 includes an image signal input unit 11, an image processing unit 12, an imaging unit 13, an operation panel 14, a remote controller 15, a control unit 16, and a projection optical system 30 (projection display unit).

  The image signal input unit 11 inputs an image signal (RGB signal, composite signal, etc.) from an external device such as a personal computer or a video player, or an external storage medium such as a USB memory. The image processing unit 12 performs predetermined image processing on the image signal input by the image signal input unit 11 and outputs the image signal to a light valve driving unit 31 described later. The predetermined image processing includes image quality adjustment processing, image size adjustment processing, gamma correction processing, and the like. The image processing unit 12 includes a screen shape correction unit 12a, and performs a screen shape correction process for correcting the screen shape of the projection screen 10 (correction screen 20) based on a correction operation using the pointer 2 by the operator. .

  The imaging unit 13 is realized by a CCD camera or a CMOS camera mounted on the front surface of the projector 1 and images the screen SC. As an imaging target, a test pattern for performing focus adjustment (focus adjustment) and the correction screen 20 are imaged. Imaging of the correction screen 20 is performed in order to recognize the movement of the point position P on the correction screen 20.

  The operation panel 14 is provided in the main body of the projector 1 and has an operator group for performing various operations. The operator group includes a mode switch button for switching between the correction mode and the normal mode in addition to a menu button for OSD display of the environment setting menu. The remote controller 15 is for remotely operating the main body of the projector 1, and has various operation element groups like the operation panel 14.

  The control unit 16 is configured by a CPU (Central Processing Unit) or the like, and performs overall control of the projector 1. Moreover, the control part 16 has the movement detection part 16a and the mode switching part 16b. The former movement detection unit 16a detects the movement of the point position P on the screen SC by the pointer 2 from the imaging result of the imaging unit 13 (details will be described later). The latter mode switching unit 16b switches between the correction mode and the normal mode according to the mode switching operation using the operation panel 14 or the remote controller 15.

  On the other hand, the projection optical system 30 adopts a liquid crystal method, and has a light valve driving unit 31, a lamp driving unit 32, a lens position detecting unit 33, a lens driving unit 34, a light source lamp 35, a liquid crystal light valve 36, and a lens group 37. is doing.

  The light valve driving unit 31 is a driver for driving the liquid crystal light valve 36, and sets the light transmittance of each pixel by applying a driving voltage corresponding to an image signal to each pixel of the liquid crystal light valve 36. To do. The lens position detection unit 33 detects the position of the focus lens and zoom lens (both not shown) included in the lens group 37 in the optical axis direction. The lens group 37 includes a projection lens in addition to a focus lens and a zoom lens. The lens driving unit 34 is a driver for adjusting the position and angle of the lens group 37, and performs adjustment based on the detection result of the lens position detection unit 33.

  The lamp driving unit 32 is a driver for lighting the light source lamp 35 which is a discharge light emitting type lamp, and generates an high voltage to form a discharge circuit, and maintains a stable lighting state after lighting. A ballast circuit (both not shown). As the light source lamp 35, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp can be applied. Instead of the light source lamp 35, a solid light source such as a laser or LED may be used.

  With the above configuration, the light emitted from the light source lamp 35 is separated into R, G, and B color light by a light separation optical system (such as a dichroic mirror, not shown), and then the liquid crystal light valve 36 for each color is opened. Modulated by transmission. The modulated image light is combined for each pixel by a light combining optical system (such as a dichroic prism, not shown) to form a color image, and the color imaged image light is emitted through the lens group 37. As a result, the projected image is displayed on the screen SC.

  Next, the screen shape correction process will be described with reference to FIGS. FIG. 4 is an explanatory diagram of the correction operation. For example, as shown in FIG. 5A, the point position P is arranged at the lower right corner of the correction screen 20 by the irradiation of the laser beam from the pointer 2 in a state where the correction screen 20 is displayed in a distorted shape. If the adjustment marker M is moved in the lower right direction according to the adjustment marker M (see FIG. 5B), the screen shape of the correction screen 20 changes based on the movement direction and movement amount of the point position P (FIG. c)). That is, in the example of FIG. 4, the vertex position at the lower right of the correction screen 20 changes. In this example, since the screen shape of the correction screen 20 is changed, the point position P is arranged on the adjustment marker M in FIG. This is because in this example, “the amount of movement of the point position P≈the amount of change in the shape of the correction screen 20 (the amount of change in the vertex position)” is set, but the amount of movement of the point position P is corrected. When the shape change amount of the screen 20 is set to be large, the point position P may deviate from the adjustment marker M in a state after the screen shape of the correction screen 20 is changed.

  Note that the adjustment amount between the movement amount of the point position P and the shape change amount of the correction screen 20 may be set by an environment setting or the like on the menu screen. According to this configuration, the shape of the correction screen 20 is greatly changed by slightly moving the point position P, or the shape of the correction screen 20 is not significantly changed even if the point position P is moved. The setting according to the operator's preference is possible.

  FIG. 5 is a diagram illustrating a captured image 25 that is an imaging result of the imaging unit 13. The captured image 25 includes an image of the correction screen 20, the adjustment marker M, and the point position P. In the figure, for easy understanding, the outer frame of the correction screen 20 before the correction operation is indicated by a dotted line, and the illustration of the adjustment marker M before the correction operation is omitted. Here, by the correction operation shown in FIG. 4, the point position P is moved from the movement start point (X1, Y1) indicated by the white circle with dotted line to the movement end point (X2, Y2) indicated by the black dot. And In this case, the controller 16 (movement detector 16a) first detects the point position P. The detection is performed by analyzing the captured image 25 and extracting a position that satisfies a certain condition based on brightness, luminance, hue, and the like. Subsequently, the control unit 16 determines whether or not the movement start point (X1, Y1) is within the adjustment marker M. If it is determined that the movement start point (X1, Y1) is within the adjustment marker M, the movement direction and movement amount of the point position P are calculated based on the coordinates of the movement start point and the movement end point. On the other hand, when the movement start point (X1, Y1) is not within the adjustment marker M, movement detection is not performed. Further, the image processing unit 12 (screen shape correcting unit 12a) corrects the correction parameter of the corner (in this example, the lower right corner) corresponding to the corrected adjustment marker M based on the calculated moving direction and moving amount. And the shape of the correction screen 20 is changed based on the correction parameter. Further, the image processing unit 12 stores the generated correction parameter in a memory (not shown), and sets the screen shape of the projection screen 10 to be projected when the mode is shifted to the normal mode to the stored correction parameter. Correct based on.

  6 and 7 are diagrams illustrating the movement of the point position P with respect to the adjustment marker M. FIG. The illustrated arrow indicates the movement locus of the point position P. In the above example, as shown in FIG. 6A, when the movement start point (X1, Y1) is within the adjustment marker M (when it is arranged on the adjustment marker M), movement detection is performed. However, the present invention is not limited to this, and movement detection may be performed by other methods. For example, when the movement start point (X1, Y1) and the movement end point (X2, Y2) are outside the adjustment marker M, as shown in FIG. Also good. In this case, the movement direction and the movement amount are calculated based on the coordinates (Xa, Ya) and (Xb, Yb) at both ends of the movement locus in the adjustment marker M.

  Further, as shown in FIG. 7A, movement detection may be performed when the movement end point (X2, Y2) is within the adjustment marker M. Further, as shown in FIG. 7C, the point position P is set to the adjustment marker M regardless of whether the movement start point (X1, Y1) and the movement end point (X2, Y2) are within the adjustment marker M. , Movement detection may be performed based on the movement start point (X1, Y1) and the movement end point (X2, Y2).

  In addition, when the movement locus is a curve, the tangent direction of the curve may be detected as the movement direction. Also, which movement detection method to use among the patterns shown in FIGS. 6A to 7B may be set by setting the environment on the menu screen.

  Next, screen shape correction processing by the projector 1 will be described with reference to the flowchart of FIG. When the projector 1 is switched from the normal mode to the correction mode by the operation of the operation panel 14 or the remote controller 15 by the operator (S01: Yes), the detection of the point position P is started, and the point position P on the adjustment marker M is detected. When the movement is detected (for example, when the movement starting point is within the adjustment marker M, S02: Yes), the correction screen is displayed by the image processing unit 12 based on the movement direction and the movement amount of the point position P. 20 deformation processing is performed (S03). Along with the deformation process of the correction screen 20, the screen shape of the projection screen 10 projected in the normal mode is corrected. After the deformation process, the process returns to S02.

  On the other hand, when the movement on the adjustment marker M is not detected (S02: No), it is determined whether or not the mode is switched to the normal mode (S04). When the mode is switched (S04: Yes), the screen shape correction process ends. Moreover, when mode switching is not performed (S04: No), it returns to S02.

  As described above, according to the projection system SY1 according to the first embodiment, the screen shape of the projection screen 10 is corrected intuitively and easily by moving the point position P on the screen using the pointer 2. be able to. Further, since the correction operation is performed using the pointer 2, even when a plurality of projectors 1 are arranged close to each other, the screen shape correction can be performed only for one projector 1 to be corrected. (There is no effect on the other projectors 1 as in the case of performing the correction operation using the remote controller 15). Further, since the pointer 2 is used to indicate an arbitrary position even when a projected image is projected in the normal mode, a special pointing device for performing image shape correction is not required. Furthermore, since a laser is used as the light source, the screen shape can be corrected even at a location away from the screen SC.

  In addition, since the correction mode and the normal mode can be switched and the image correction operation is effective only in the correction mode, image correction is not performed erroneously when a normal projection image is displayed. Further, since the correction screen 20 is displayed in the correction mode, the correction operation can be performed more intuitively and easily with a sense of moving the positions of the sides and the vertices of the correction screen 20. Further, since the shape (side and vertex positions) of the correction screen 20 also changes with the correction operation, the operation can be performed while checking the correction result.

  In the above embodiment, the mode switching is performed by operating the operation panel 14 or the remote controller 15. However, the mode switching may be performed using the pointer 2. For example, as shown in FIG. 9, when the movement detection unit 16a detects that the point position P is superimposed on the specific area 41 excluding the projection screen 10 or the correction screen 20 on the screen SC, the mode is switched. Anyway. In this case, when the point position P is superimposed on the specific area 41 in the normal mode, the mode shifts to the correction mode. In addition, when the point position P is superimposed on the specific area 41 in the correction mode, the mode is shifted to the normal mode. As shown in the figure, the mode (color and design) of the specific area 41 in the normal mode and the specific area 41 in the correction mode may be different so that the currently set mode can be identified. .

  Also, as shown in FIG. 10, when the movement detection unit 16a detects that a specific line image 42 is drawn by the movement locus of the point position P (illustrated by a dotted line), mode switching is performed. Also good. In this case, when the specific line image 42 is drawn on the projection screen 10 in the normal mode, the mode shifts to the correction mode. In addition, when a specific line image 42 is drawn in the correction mode, the mode is shifted to the normal mode. Note that the line image 42 when shifting to the correction mode and the line image 42 when shifting to the normal mode may be different images. As described above, according to the configuration shown in FIGS. 9 and 10, since the mode switching can be performed using the pointer 2, the mode switching and the switching can be performed without approaching the projector 1 main body even at a place away from the screen SC. A screen shape correction operation can be performed.

  Further, in the above embodiment, the adjustment marker M is arranged in a state in which it is inscribed in each of the four corners of the correction screen 20 (see FIG. 4 and the like). However, as shown in FIG. The arrangement may be such that each of the four vertices of 20 is superposed. Further, the adjustment marker M may be arranged on the side as well as the corner of the correction screen 20. For example, as shown in FIG. 11B, four adjustment markers M inscribed in the four corners of the correction screen 20, and four adjustment markers M inscribed in the four sides of the correction screen 20, respectively. A total of eight adjustment markers M may be arranged. In addition, the number of adjustment markers M is arbitrary.

  Further, the shape of the adjustment marker M is not necessarily square. For example, as shown in FIG. In addition, it may be a sector shape or a circular shape. Further, the adjustment marker M may not be displayed. In this case, as shown in FIG. 12B, only the correction screen 20 is displayed in the correction mode, but the movement of the point position P is detected by the adjustment marker M as shown in FIGS. This is done in the same way as displayed.

  In the above embodiment, a laser pointer is exemplified as the pointer 2. However, as a pointing device that irradiates a light beam, for example, an LED light or a flashlight with high directivity (a type that can change the amount of light and directivity) Etc.) may be used. Moreover, it is preferable to use a bullet-type LED with high directivity as the LED light.

  In addition, a pointing device that does not emit light may be used. A mouse can be employed as such a pointing device. In this case, a mouse connection unit is added to the projector 1. The mouse connection unit acquires an operation signal from the mouse and outputs the operation signal to the control unit 16. Based on an operation signal (movement signal) from the mouse, the control unit 16 (movement detection unit 16a) moves and moves the cursor position (the position of the cursor displayed on the projection screen 10 or the correction screen 20) by the mouse. Is detected. Thus, even when a mouse is used as the pointing device, the correction operation can be performed intuitively and easily. When a mouse is used as a pointing device as in this modification, if the correction screen 20 is the same size as the projection area, the mouse cannot be moved beyond the projection area. Also, it is preferable that the reduced size is slightly smaller.

  In addition to a mouse, a touch panel, a track pad, a touch pad, a joystick, a track ball, or the like may be used as a pointing device. Further, the pointing device and the projector 1 may be wired connection or wireless connection (infrared communication, short-range wireless communication, etc.). In this case, the connection between the pointing device and the projector 1 may not be direct, but may be an indirect connection between the pointing device and the projector 1 via a personal computer or the like. That is, a mouse provided in a personal computer may be used as a pointing device for correcting the screen shape.

  In the above-described embodiment, each adjustment marker M is individually operated. However, correction may be performed in conjunction with a plurality of adjustment markers M (such as the vertex position of the correction screen 20). For example, in the state where the correction screen 20 and the adjustment marker M as shown in FIG. 2 are displayed, when the adjustment marker M located at the lower right of the four adjustment markers M is moved to the right, the lower left is displayed. The positioned adjustment marker M may also be moved to the left by the same movement amount. In other words, vertical or horizontal distortion correction may be performed in a general keystone distortion correction procedure. Further, as shown in the above embodiment, whether to correct each of the four corners of the correction screen 20 (quick corner correction) or whether to correct the vertical or horizontal distortion amount (keystone distortion correction). Any correction method may be selectable according to the preference of the operator.

  In the above embodiment, the correction screen 20 is displayed in the correction mode, but it is not always necessary to display it. That is, even in the correction mode, the screen shape of the projection screen 10 may be corrected by moving the pointer 2 with respect to the projection screen 10 that is the projection area.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the correction operation is performed using the pointer 2, but in the present embodiment, the correction operation is performed using the human hand 60 (finger). Only differences from the first embodiment will be described below. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, the modification applied about the component similar to 1st Embodiment is applied similarly about this embodiment.

  FIG. 13 is an image diagram of the projection system SY2 according to the second embodiment. As shown in the figure, the projection system SY2 includes a projector 1 that projects the projection screen 10 and a screen SC on which the projection screen 10 is projected. In the present embodiment, the operator approaches the screen SC and performs the correction operation by bringing the hand 60 (object) into contact with (or touching) the correction screen 20 (see FIG. 14) displayed on the screen SC. The hardware configuration of the projector 1 according to this embodiment is the same as that of the first embodiment (see FIG. 3).

  FIG. 14 is an explanatory diagram of the correction operation in the correction mode according to the second embodiment. For example, as shown in FIG. 6A, in the state where the correction screen 20 is displayed in a distorted shape, the hand 60 (finger tip) is aligned with the adjustment marker M at the lower right corner and moved in the lower right direction. When this is done (see (b) in the figure), the screen shape of the correction screen 20 changes based on the moving direction and the moving amount of the hand 60 (see (c) in the figure).

  FIG. 15 is a diagram illustrating a captured image 25 obtained by capturing the correction screen 20 illustrated in FIG. 4 by the imaging unit 13. This figure shows that the human hand 60 has been moved from the position shown by the dotted line to the position shown by the solid line by the correction operation shown in FIG. In this case, the control unit 16 (movement detection unit 16a) determines, from the captured image 25, a change in reflectance due to the projection light (the correction screen 20 and the adjustment marker M) of the projector 1 being blocked by the hand 60. Thus, the tip position of the hand 60 (tip position of the finger) is detected. That is, on the captured image 25, it is detected that the tip position of the hand 60 has moved from the movement start point (X1, Y1) indicated by a white circle with a dotted line to the movement end point (X2, Y2) indicated by a black circle. . The change in reflectance may be caused not by the hand 60 itself but by the shadow of the hand 60. Subsequently, it is determined whether or not the movement start point (X1, Y1) serving as the tip position of the hand 60 is within the adjustment marker M. If it is determined that the movement start point (X1, Y1) is within the adjustment marker M, the movement direction and the movement amount of the hand 60 are calculated based on the coordinates of the movement start point and the movement end point. That is, movement detection is performed with the “tip position of the hand 60” as the “point position P” in the first embodiment. Note that the control unit 16 preferably detects the movement of an object having a size larger than a human finger (for example, a diameter of 1 cm or more) when detecting the movement. As a result, it is possible to prevent erroneous determination due to imaging of insects, dust, and the like by the imaging unit 13.

  Thus, according to the projection system SY2 according to the second embodiment of the present invention, the hand 60 is moved on the correction screen 20 displayed on the screen SC, so that it is more intuitive than when the pointer 2 is used. Correction operation can be performed. Further, since the hand 60 is used, no special tool is required for performing the correction operation.

  In the above embodiment, the correction operation is performed using the human hand 60. However, a pointing stick, a marker (writing tool), or the like may be used. Also in this case, the screen shape correction process of the projection screen 10 is performed by detecting the movement of the tip position of the object.

  In the above-described embodiment, the hand 60 is moved while being in contact with the screen SC. However, the hand 60 is not necessarily in contact with the object, and the object is moved between the projector 1 (imaging unit 13) and the screen SC. You can do it. That is, as shown in FIG. 16, the movement of the object may be on the screen SC 91, may be a position 92 slightly separated from the screen SC, or may be a position 93 far away from the screen SC. May be. However, when the object is moved at the position 92 or the position 93, the control unit 16 (movement detection unit 16a) detects the tip position of the shadow of the object.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in that the pointer 2 shown in the first embodiment and the human hand 60 shown in the second embodiment can be selected as means for performing the correction operation. Only this characteristic point will be described below.

  FIG. 17 is a diagram illustrating a mode selection system of the projector 1 according to the third embodiment. The illustrated dotted line frame will be described later as a modified example. As shown in the figure, in this embodiment, first, as in the first embodiment, either a normal mode for projecting the projection screen 10 or a correction mode for correcting the screen shape can be selected. . When the correction mode is selected, either a pointing device use mode or an object use mode can be selected (moving object selection unit). Here, when the pointing device use mode is selected, the operator performs a correction operation using the pointer 2. When the object use mode is selected, the correction operation is performed using the hand 60.

  FIG. 18 is a diagram illustrating an example of the correction screen 20 and the adjustment marker M displayed in the pointing device usage mode and the object usage mode, respectively. As shown in FIG. 5A, in the pointing device use mode, a black adjustment marker M is displayed on the white correction screen 20 and at the four corners of the correction screen 20. On the other hand, as shown in FIG. 4B, in the object use mode, a white adjustment marker M is displayed on the black correction screen 20 and at the four corners of the correction screen 20. The white adjustment marker M is larger in size than the black adjustment marker M displayed in the pointing device use mode.

  As described above, the projector 1 according to the third embodiment of the present invention can cope with both the correction operation using the pointer 2 and the correction operation using the hand 60. Thereby, either the pointing device use mode or the object use mode can be selected according to the preference of the operator, the content of the presentation, the size of the screen SC, and the like. Further, since the correction screen 20 and the adjustment marker M corresponding to each mode (in accordance with the moving body to be used such as the pointer 2 and the hand 60) are displayed, it is expected to improve the movement detection accuracy and the operability of the correction operation. it can.

  As a modification, a mode selection item may be added as shown by a dotted frame in FIG. For example, in the pointing device use mode, the pointing device may be selectable in the lower hierarchy. Furthermore, when a laser pointer is used as a pointing device, the color of the laser light may be selectable. In the object use mode, the object may be selectable in the lower hierarchy. Furthermore, it is possible to select an operation position (such as operation positions 91 to 93 in FIG. 16) as a lower hierarchy. According to these configurations, the color of the correction screen 20 and the adjustment marker M, the brightness of the correction screen 20 and the adjustment marker M, the size of the correction screen 20 and the adjustment marker M, and the like are appropriately determined according to the selection result of each item. Can be varied.

  Further, the mode switching method may be varied according to the selection result of the pointing device use mode and the object use mode. For example, in the pointing device usage mode, as shown in FIGS. 9 and 10, the mode is switched according to the mode switching instruction using the pointing device, and in the object usage mode, the operation panel 14 or the remote control 15 is used. It is good also as a structure which performs mode switching according to a mode switching instruction | indication. According to this configuration, an appropriate mode switching method can be adopted according to the selected mode (selected mobile body). Further, in the pointing device use mode, the mode switching operation and the correction operation can be performed at a place away from the projector 1 without bothering to approach the projector 1 by adopting the mode switching instruction using the pointing device. Further, in the object use mode, the mode conversion is mistakenly performed because the object is blocked in front of the imaging unit 13 by not performing the mode switching by the method shown in FIGS. 9 and 10. Can solve such problems.

  Although three embodiments have been described above, each component and each function of the projector 1 shown in each embodiment can be provided as a program. Further, the program can be provided by being stored in various recording media (CD-ROM, flash memory, etc.). That is, a program for causing a computer to function as each component of the projector 1 and a recording medium on which the program is recorded are also included in the scope of the right of the present invention.

  In the above embodiment, the transmissive liquid crystal display method is adopted as the display method of the projector 1, but a projector such as a reflective liquid crystal display method, a CRT display method, a light switch display method (micromirror device method), or the like. The display principle of 1 does not matter. Other modifications can be made as appropriate without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Pointer, 11 ... Image signal input part, 12 ... Image processing part, 12a ... Screen shape correction | amendment part, 13 ... Imaging part, 14 ... Operation panel, 15 ... Remote control, 16 ... Control part, 16a ... Movement Detection unit, 16b ... mode switching unit, 30 ... projection optical system, 31 ... light valve drive unit, 32 ... lamp drive unit, 33 ... lens position detection unit, 34 ... lens drive unit, 35 ... light source lamp, 36 ... liquid crystal light Valve, 37 ... lens group, SC ... screen

Claims (13)

A projection display unit for displaying a projection screen on the screen;
An imaging unit for imaging the screen;
A movement detection unit that detects the movement of the object from the imaging result of the imaging unit;
A projector comprising: a screen shape correction unit that corrects a screen shape of the projection screen based on the movement of the object.   The projector according to claim 1, wherein the movement detection unit detects a movement direction and a movement amount of the object.   The movement detection unit determines the change of the reflectance from the captured image that is the imaging result of the imaging unit by determining a change in reflectance due to the projection light from the projection display unit being blocked by the object. The projector according to claim 1, wherein the projector is detected. The projection display unit displays a rectangular area indicating the shape of the projection screen on the screen,
The projector according to claim 3, wherein the movement detection unit detects movement of the object on the captured image with reference to the rectangular area displayed on the screen.   The screen shape correction unit corrects the screen shape of the projection screen by changing the positions of the sides and / or vertices of the rectangular area where the object is close or superimposed with the movement of the object. The projector according to claim 4. The projection display unit displays a plurality of marker images arranged at a plurality of locations including the four vertex positions of the rectangular region together with the rectangular region,
The projector according to claim 5, wherein the movement detection unit detects movement of the object that has passed over the marker image.   The projector according to claim 6, wherein the plurality of marker images include four corner regions that are inscribed in four corners of the rectangular region and do not overlap each other. A mode switching unit that switches between a correction mode for correcting the screen shape based on the movement of the object and a normal mode for projecting the projection screen;
The projector according to claim 6, wherein the movement detection unit and the screen shape correction unit function only in the correction mode. The movement detection unit can detect not only the movement of the object but also the movement of the point position using the pointing device on the screen,
The projector according to claim 8, wherein the screen shape correction unit corrects a screen shape of the projection screen based on movement of the object or a moving body that is the point position. A moving body selection unit for selecting either the movement of the object or the movement of the point position;
The projector according to claim 9, wherein the movement detection unit detects movement of the object or the point position according to a selection result of the moving body selection unit.   The projection display unit varies at least one item of color, brightness, and size of the rectangular area and / or the marker image according to a selection result of the moving body selection unit. The projector according to claim 10. When the movement of the point position is selected by the moving body selection unit,
The projector according to claim 10 or 11, wherein the mode switching unit performs mode switching in accordance with a mode switching instruction using the pointing device. A screen shape correction method for a projector that displays a projection screen on a screen,
Imaging the screen;
Detecting the movement of the object from the imaging result of the screen;
Correcting the screen shape of the projection screen based on the movement of the object; and a method for correcting the screen shape of the projector.

Images