JP4508750B2 - projector - Google Patents

Description

  The present invention relates to a projector that performs focus adjustment of a projected image using a focus adjustment test pattern.

  In the field of presentation or video projection, a projector is used that projects an image based on image data input from a personal computer or a video playback device onto a projection object such as an external screen. Such a projector generates modulated light representing an image based on image data by giving image data to a projection device such as a liquid crystal panel or DMD (Digital Micromirror Device), and the generated modulated light is used as an internal light source. It is the structure which projects on to-be-projected bodies, such as an external screen, with the light from. In addition, such a projector may project a color image by projecting an image in which R (red), G (green), and B (blue) colors are combined, or by projecting RGB images in a time division manner. it can.

  In general, the relative position between the projection object and the projector is not fixed, except when the projection object such as a screen and the projector are both fixed as in a theater. For this reason, it is necessary for the projector to adjust the projection range, projection shape, focal length, and color of the image so that an appropriate image is projected onto the screen. A conventional technique for adjusting a projector is disclosed in Patent Document 1, for example.

  In the invention disclosed in Patent Document 1, various adjustments as described above are performed using a test pattern for focus adjustment in which a plurality of straight lines are arranged in parallel in the vertical direction as shown in a schematic diagram of FIG. The focal length is adjusted. In the invention described in Patent Document 1, the projector projects a test pattern for focus adjustment as shown in FIG. 9 and picks up an image with an image pickup device. From the picked-up image data, a portion having a high peak value of the horizontal amplitude, Alternatively, the best focus position is obtained by detecting the presence or absence of a high-order frequency component by Fourier series expansion.

Further, even if the projector is not a projector that can automatically perform focus adjustment as disclosed in Patent Document 1, but a projector that is configured so that the user manually performs focus adjustment, for example, FIG. If a test pattern for focus adjustment as shown is projected in the direction of the screen, and the user performs the focus adjustment while visually confirming the state, the focus adjustment by manual operation is facilitated.
JP 2000-241874 A

  By the way, when projecting an image onto a projection object such as a screen by a projector, it goes without saying that it is desirable to focus on the center of the projection object most noticed. However, the focus adjustment test pattern used in the invention disclosed in Patent Document 1 is set over the entire range of the image to be originally projected. When adjusting the focus using a test pattern, focus on one location near the center of the image captured by the imaging device, or optimize the average focus on the entire screen including the periphery. It is said that it can also be done. However, when focusing is performed on one position near the center of the image captured by the imaging device, the center of the image captured by the imaging device and the center of the image of the projection target do not coincide with each other. Can't focus on the center of

  On the other hand, when the test pattern for focus adjustment is set only in the center of the range of the image to be originally projected, as shown in the schematic view of FIG. The center of the focus adjustment test pattern FP in the projection image PJ of the test pattern projected onto the screen S does not coincide with the center of the screen S, and the focus adjustment test pattern FP is not projected onto the center portion of the screen S. Can occur. In such a case, the focus adjustment test pattern FP can be obtained by manually moving the installation position of the projector itself or changing the installation orientation of the projector (changing the tilt in the front-rear direction or the left-right direction of the projector). Of course, it is possible to adjust the projection so that it is projected onto the center of the screen S as much as possible. However, when the user does not want to change the installation position and / or orientation of the projector, or when it is impossible for some reason, the focus adjustment test pattern FP is displayed at the center of the screen S. The focus adjustment is unavoidable regardless of whether it is automatic or manual operation by the user.

  Therefore, in the case of the conventional projector, there is a high possibility that the focus is high on a portion other than the center of the projection target such as a screen that is considered to be focused. For this reason, conventionally, when an image is actually projected, there is a possibility that the center portion of the screen that is most noticed is in a so-called defocused state.

  The present invention has been made in view of the above circumstances, and its main purpose is to project a focus adjustment test pattern onto the center of a projection object such as a screen. An object of the present invention is to provide a projector capable of performing focus adjustment based on a focus adjustment test pattern projected on the center of the projection body, in other words, focusing on the center of the projection body such as a screen.

  Another object of the present invention is to provide a projector capable of automatically projecting a focus adjustment test pattern onto a central portion of a projection target.

  A projector according to the present invention includes a spatial light modulation unit that generates modulated light representing a rectangular image, a projection unit that projects the modulated light modulated by the spatial light modulation unit onto a projection target, and a test pattern for focus adjustment. A test pattern image generating means for generating a test pattern image including the spatial light modulation means for spatial light modulation, and an imaging means for imaging a projection state of the image projected by the projection means, and projecting the test pattern image In the projector that adjusts the focus of the projection image based on the image captured by the imaging unit, the state is determined from the relative positional relationship between the test pattern image and the image of the projection object on the image captured by the imaging unit. Calculation means for obtaining a position on the image generated by the spatial light modulation means corresponding to the center of the image of the projection object on the image picked up by the image pickup means , Characterized in that a control means for matching the center of the focus adjusting test pattern at a position on the image in which the spatial light modulator for said calculating means is calculated to produce.

  In such a projector according to the present invention, first, based on the relative positional relationship between the test pattern image on the image captured by the imaging unit and the image of the projection target, the projection of the projection target on the image captured by the imaging unit. A position on the image generated by the spatial light modulator corresponding to the center of the image is obtained. Then, the center of the focus adjustment test pattern is displayed so as to coincide with the position on the image generated by the spatial light modulation means thus obtained.

  In the projector according to the aspect of the invention described above, the calculation unit obtains positions of the four corners of the test pattern image and the image of the projection object on the image captured by the imaging unit, and determines the obtained test pattern. Based on the correspondence between the four corner positions of the image and the four corners of the image generated by the spatial light modulation means, the spatial light modulation is performed on the four corner positions of the image of the projection object on the image captured by the imaging means. The position on the image generated by the spatial light modulation unit corresponding to the center position of the image of the projection object on the image captured by the imaging unit is made to correspond to the position on the image generated by the unit. It is characterized by being requested.

  In the projector according to the present invention, in the above-described invention, first, the positions of the four corners of the test pattern image and the image of the projection object on the image captured by the imaging unit are obtained. Based on the correspondence between the four corner positions of the test pattern image thus obtained and the four corner positions of the image generated by the spatial light modulation means, the image of the projection object on the image captured by the imaging means Are made to correspond to the positions on the image generated by the spatial light modulation means, so that the spatial light modulation means corresponding to the center position of the image of the projection object on the image captured by the imaging means is generated. The position on the image is determined.

  According to the projector according to the present invention as described above, the focus adjustment test pattern is automatically displayed at the center of the projection object such as the screen on which the test pattern image is projected. Since the focus adjustment is performed based on the projected image of the focus adjustment test pattern projected onto the projector, it is possible to project an image that is focused on the center of the projected object most noticeable in the projected image become.

  According to the projector of the present invention, in the above-described invention, the positions of the four corners of the test pattern image and the image of the projection object on the image captured by the imaging unit are obtained, and the positions of the four corners of the test pattern image and the spatial light are obtained. The position on the image generated by the spatial light modulator corresponding to the center position of the image of the projection object on the image picked up by the image pickup means based on the correspondence with the four corner positions of the image generated by the modulation means Therefore, the focus adjustment test pattern is automatically projected on the center of the projection target.

  Furthermore, according to the projector of the present invention, the projection position of the focus adjustment test pattern is arbitrarily moved in accordance with the input of the movement instruction of the focus adjustment test pattern by the user. Therefore, if the user desires, the focus adjustment test By projecting the pattern onto the center of the projection object such as a screen and manually adjusting the focus, it is possible to project an image focused on the central part of the projection object most noticed.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram showing an internal configuration example of an embodiment of a projector according to the present invention. The projector 1 according to the present embodiment has an auto adjustment function that can automatically prepare for projection. Specifically, the auto adjustment function projects a test pattern image from the projection lens 2 serving as a projection unit to the screen S that is a projection target at the time of projection preparation, and the state of the test pattern image projected onto the screen S is a camera unit. 3, focus adjustment, color correction, and the like are performed based on the results captured in step 3, and projections such as the size, position, and keystone correction of the projected image are performed based on the positions of the four corners of the screen S and the four corners of the test pattern image. This is a function for making preparations.

  The projector 1 includes an external connection unit 4 and an image conversion unit 5 as portions that mainly perform processing on a projection image input from the outside. Further, the projector 1 includes a color control unit 6, a test pattern image switching unit 7, a projection device unit 8, a projection lens driving unit 9, and a projection lens 2 as parts that mainly perform processes related to projection. Furthermore, the projector 1 includes a camera unit 3 and a detection unit 11 as a part that performs processing mainly related to the auto adjustment function. Furthermore, the projector 1 includes an operation unit 12 and a remote control light receiving unit 13 of a remote controller (hereinafter referred to as a remote controller) 20 as means for receiving an operation by a user. The system control unit 10 performs overall control of the projector 1 and various calculations. That is, the system control unit 10 functions as a calculation unit and a display control unit.

  The external connection unit 4 is connected to an external device that outputs an image for projection. The external connection unit 4 inputs a rectangular image output from the external device and transmits the image to the image conversion unit 5. The image conversion unit 5 performs necessary conversion processing such as A / D conversion based on the control of the system control unit 10, and transmits the image subjected to the conversion processing to the projection device unit 8.

  The color control unit 6 performs a process of adjusting the color of the projected image. Specifically, the color control unit 6 adjusts the balance of each color of R (red), G (green), and B (blue) based on the control of the system control unit 10, thereby correcting the color of the projected image. To do. The test pattern image switching unit 7 generates various test patterns necessary for the auto adjustment function based on the control of the system control unit 10 and transmits the test patterns to the projection device unit 8 as test pattern images.

  The projection device unit 8 includes a spatial light modulation element that optically modulates an image signal, and optically modulates signals representing various images transmitted from the image conversion unit 5, the test pattern image switching unit 7, and a system control unit 10 described later. Then, the image is projected on the screen S by projecting outside through the projection lens 2. As the light modulation element, a liquid crystal panel, DMD (Digital Micromirror Device), or the like can be used. In this embodiment, a liquid crystal panel (see FIG. 2) is used. Even when DMD is used, DMD generates modulated light representing an image depending on whether or not each of the fine reflectors arranged on the matrix reflects light according to a digital image signal. . Therefore, in the DMD, each of the fine reflecting mirrors corresponds to a pixel, so that it is possible to set a panel coordinate system as will be described later.

  FIG. 2 is a schematic diagram showing a coordinate system of a spatial light modulation element made of a liquid crystal panel included in the projection device unit of the projector according to the present invention, and an example of correspondence with a focus adjustment test pattern used by the projector according to the present invention. Is also shown.

  As an example in this embodiment, the panel 8a has a horizontal display range of 1024 pixels in the horizontal direction and 768 pixels in the vertical direction, that is, a rectangular display range conforming to the XGA standard, and the coordinate value (0, 0) of the upper left corner. A panel coordinate system in which the horizontal direction is the x axis and the vertical direction is the y axis is set. Therefore, when the coordinate value of the panel coordinate system corresponding to each pixel in the horizontal direction and the vertical direction is sent from the system control unit 10 to the projection device unit 8, the projection device unit 8 uses the panel coordinate system coordinate value to display the panel. The position and size of the image displayed in the display range 8a are specified by the panel coordinate system. For example, when “127” is designated as the horizontal coordinate value and “127” is designated as the vertical coordinate value from the system control unit 10, the projection device unit 8 uses the pixel at the upper left corner of the panel 8 a as the origin in the horizontal direction. In addition, dots are displayed at the positions of the 128th pixel in the vertical direction.

  By the way, as shown in FIG. 2, the focus adjustment test pattern FP used by the projector 1 according to the present invention is a pattern in which a plurality of vertical lines are arranged in parallel in a relatively small range compared to the range of the entire projection image. However, the default setting is arranged at the center of the projected image. The focus adjustment test pattern FP itself is a fixed pattern as a whole, and the relative position and size of the focus adjustment test pattern FP with respect to the entire range of the test pattern image on which the focus adjustment test pattern FP is projected. (For example, the position and size on the panel 8a as shown in FIG. 2, that is, the position and size in the panel coordinate system) are known in advance by the system control unit 10 as a specified value.

  Although not shown, the projection lens 2 enlarges the light beam that has passed through the panel 8a and projects it as an image on the screen S, in addition to a zoom (image size) adjustment lens and a focus adjustment lens. It consists of a plurality of lenses such as lenses. The projection lens drive unit 9 includes an actuator that changes the positions of the zoom adjustment lens and the focus adjustment lens of the projection lens 2. Therefore, the projection lens drive unit 9 performs zoom adjustment and focus adjustment by driving the actuator according to the control from the system control unit 10.

  Further, the camera unit 3 shown in FIG. 1 is an imaging unit that uses an imaging device such as a CCD. The camera unit 3 captures various test pattern images projected onto the screen S during automatic adjustment of projection preparation, and detects the captured images. Transmit to. In addition to the image including the focus adjustment test pattern FP shown in FIG. 2, the test pattern image projected from the projector 1 is a test pattern for color correction, zoom adjustment, and keystone correction (keystone correction). Can be projected individually, or a test pattern image including these test patterns in one image can be projected.

  The detection unit 11 analyzes the captured image sent from the camera unit 3. That is, detection and projection of the positions of the four corners of the image of the screen S in the camera coordinate system set on the image captured by the camera unit 3 (specifically, corresponding to the CCD pixel array of the camera unit 3). Detection of the positions of the four corners of the image, focus adjustment processing based on the image of the focus adjustment test pattern, and processing such as color correction are performed. The camera coordinate system is a coordinate system in which the horizontal direction is the x-axis and the vertical direction is the y-axis with the upper left corner of the captured image (the pixel at the upper left corner of the CCD) as the origin, similarly to the panel coordinate system described above. . The detection unit 11 transmits the detection result as described above to the system control unit 10.

  The operation unit 12 provided in the projector 1 has a plurality of buttons, switches, and the like. When the user operates these buttons and switches, the operation unit 12 accepts operation instructions corresponding to the operated buttons, switches, and the like. The data is transmitted to the system control unit 10. Further, the remote control light receiving unit 13 receives an operation signal from the remote control 20 and transmits it to the system control unit 10. FIG. 3 is a schematic diagram showing the external appearance of the remote controller 20. As shown in FIG. 3, the remote controller 20 has up / down / left / right selection keys 20 a to 20 d and a determination key 20 e in addition to a plurality of buttons, and is displayed on an OSD (On Screen Display) menu image projected from the projector 1. A GUI that allows a user to select a required item from among a plurality of items by operating the selection keys 20a to 20d and the determination key 20e is employed. The operation unit 12 is also provided with up / down / left / right selection keys and determination keys similar to those of the remote controller 20.

  The system control unit 10 that controls each unit described above includes a ROM 10a and a RAM 10b. The ROM 10a stores in advance a program that defines the contents of control performed by the system control unit 10, and data for displaying various test pattern images and various menu images including the focus adjustment test pattern FP shown in FIG. . The RAM 10b temporarily stores various data generated during control by the system control unit 10.

  When the system control unit 10 of the projector 1 of the present embodiment configured as described above receives an auto-adjustment instruction indicating projection preparation from the operation unit 12 or the remote controller 20, it projects the focus adjustment test pattern FP shown in FIG. An image to be generated is generated by the test pattern image switching unit 7 and displayed on the panel 8a of the projection device unit 8 to be projected onto the screen S. Then, the detection unit 11 analyzes a captured image as a result of the camera unit 3 imaging the state in which the focus adjustment test pattern FP is projected onto the screen S. Based on the analysis result of the detection unit 11, the system control unit 10 detects the position of the image on the screen S (more specifically, the positions of the four corners) on the captured image, that is, in the camera coordinate system. Then, the system control unit 10 changes the display position of the focus adjustment test pattern FP on the panel 8a of the projection device unit 8 so that the focus adjustment test pattern FP is projected onto the center of the screen S. After the focus adjustment test pattern FP is projected onto the center of the screen S in this way, the detection unit 11 analyzes the captured image obtained as a result of imaging by the camera unit 3 and performs focus adjustment.

  The color correction process using the test pattern image for color correction may be performed prior to the focus adjustment process described above or may be performed later. Specifically, a test pattern for color correction is generated by the test pattern image switching unit 7, and an image displayed on the panel 8 a of the projection device unit 8 is projected from the projection lens 2. Based on the analysis result of the captured image obtained by the detection unit 11, the color of the image projected in a situation where the screen S is installed (for example, ambient brightness, ground color of the screen S, etc.) is appropriate. The system control unit 10 sets adjustment items for the color control unit 6 so that

  When the focus adjustment and the color correction process are completed as described above, the system control unit 10 displays an image displayed on the panel 8a of the projection device unit 8 so that the image is projected onto the screen S at an appropriate position and size. Are calculated, and the calculated coordinate values are sent to the projection device unit 8. As a result, on the panel 8a, the image to be projected is deformed and displayed in a distorted state opposite to the shape projected on the screen S without correcting the trapezoidal distortion.

  When the system control unit 10 sequentially executes the above-described series of processes, the projection device unit 8 displays an image on the panel 8a according to the coordinate value given from the system control unit 10, and when this is projected, a trapezoid is formed. The image is projected to the full size of the screen S as a rectangular image with corrected distortion. Thus, the projection preparation of the projector 1 is automatically completed.

  The adjustment processing by the system control unit 10 as described above is basically a conventional technique, but the projector according to the present invention automatically projects the focus adjustment test pattern FP onto the center of the screen S. This is different from the conventional projector of this type. The flowchart of FIG. 4 showing the procedure of this processing performed by the system control unit 10, the schematic diagram of FIG. 5 showing the camera image 3I imaged by the camera unit 3, the coordinate system of the spatial light modulator 8a and the focus adjustment 6 will be described with reference to the schematic diagram of FIG. 6 showing the correspondence with the test pattern FP for use and the schematic diagram of FIG. 7 showing the actual projection state.

As shown in FIG. 2, in the default state, the focus adjustment test pattern FP is displayed at the center of the panel 8a and projected from the projection lens 2 onto the screen S. FIG. 10 is a schematic view of such a state as viewed from the front of the screen S, and the camera unit 3 images this state. The camera image 3I captured by the camera unit 3 in this case is as shown in the schematic diagram of FIG.
The projection image PJ on which the focus adjustment test pattern TP is projected is picked up with a slight distortion depending on the installation state of the projector 1, and the screen S is picked up with a large distortion. Since the focus adjustment test pattern FP is displayed on the panel 8a in the default state shown in FIG. 2, the focus adjustment test pattern FP is projected on the center of the projection image PJ.

  From such a camera image 3I, the detection unit 11 determines the range of the projection image PJ in the camera coordinate system, for example, because the brightness of the reflected light of the projection image is clearly different from the surroundings (for example, walls). It can be detected. Further, the range of the screen S in the camera coordinate system can also be detected by image processing because, for example, the brightness of reflected light from the screen S of the projected image is clearly different from the background (for example, a wall). However, a method may be adopted in which reflectors are installed at the four corner positions of the screen S so that the four corner positions of the screen can be detected more easily.

  As described above, the system control unit 10 detects the positions of the four corners of the projection image PJ in the camera coordinate system (step S11), detects the positions of the four corners of the image on the screen S, and based on this result, the screen S The coordinate value of the center SC of the image in the camera coordinate system is obtained (step S12).

  Next, the system control unit 10 regards the positions of the four corners of the projection image PJ in the camera coordinate system as the positions of the four corners of the panel 8a, in other words, the coordinate values of the four corners of the panel coordinate system. The coordinate value of the center SC of the image on the screen S is converted to a coordinate value in the panel coordinate system (step S13). Specifically, this conversion processing obtains conversion coefficients for converting the coordinate values of the four corners of the projection image PJ in the camera coordinate system into a panel coordinate system by performing known two-dimensional projective conversion, and this conversion coefficient Is applied to the coordinate value of the center SC of the image of the screen S in the camera coordinate system.

  As shown in the schematic diagram of FIG. 6, the system control unit 10 makes the center of the focus adjustment test pattern FP coincide with the coordinate value of the center SC of the screen S in the panel coordinate system obtained as described above. The display state of the projection device unit 8 is controlled so that the focus adjustment test pattern FP is displayed on the panel 8a (step S14).

  As a result, as shown in the schematic diagram of FIG. 7, the focus adjustment test pattern FP is projected onto the center portion of the screen S in the actual projection state. The system control unit 10 back-calculates the position of the image of the focus adjustment test pattern FP on the image 3I captured by the camera unit 3 from the display position of the focus adjustment test pattern FP on the panel 8a. Is possible. Therefore, the system control unit 10 can perform focus adjustment from the image data in the range of the focus adjustment test pattern FP in the camera coordinate system.

  By the way, in the above-described embodiment, the projector 1 automatically applies the focus adjustment test pattern FP on the screen S based on the projected image PJ on the captured image 3I captured by the camera unit 3 and the image range of the screen S. It is processed so that it projects to the center. However, for example, the camera unit 3 and the detection unit 11 in the configuration of the projector 1 according to the present invention shown in FIG. 1 are not provided, and various adjustments cannot be performed automatically, but the focus adjustment test pattern FP In the case of a projector configured to manually adjust the focus while visually confirming the projection state, the system control unit 10 performs the focus adjustment according to the procedure shown in the flowchart of FIG. It is possible.

  First, the system control unit 10 controls the test pattern switching unit 7 to display the focus adjustment test pattern FP in the center of the panel 8a of the projection device 8 in a default state as shown in FIG. The test pattern FP is projected toward the screen S (step S21). The user visually confirms this state (the state shown in the schematic diagram of FIG. 10) and operates the selection key 20a to 20d and the determination key 20e on the operation unit 12 or the remote controller 20 to adjust the focus. The test pattern FP can be projected on the center of the screen S.

  The system control unit 10 monitors the operating states of the up / down / left / right selection keys 20a to 20d and the enter key 20e (NO in step S22, NO in S23). When the user operates any of the up / down / left / right selection keys 20a to 20d (YES in step S22), the system control unit 10 has a direction corresponding to the operated key 20a (or 20b, 20c, 20d). The focus adjustment test pattern FP displayed on the panel 8a is moved by a predetermined number of pixels (step S24).

  When the user repeatedly operates the up / down / left / right selection keys 20a to 20d as described above, the display position of the focus adjustment test pattern FP on the panel 8a is moved. The projection position moves on the screen S. Accordingly, the user moves the image of the focus adjustment test pattern FP almost to the center of the screen S by operating the up / down / left / right selection keys 20a to 20d, and the user moves the screen S of the focus adjustment test pattern FP in this state. The focus is adjusted manually while checking the focus state of the image projected upward. Then, when the manual focus adjustment is completed, the user operates the enter key 20e. When it is detected that the enter key 20e has been operated (NO in step S22, YES in S23), the system control unit 10 controls the test pattern image switching unit 7 to put the focus adjustment test pattern FP on the panel 8a. Do not display. Thereby, the projection of the focus adjustment test pattern FP is completed (step S25).

  Thereafter, the system control unit 10 executes a predetermined procedure or processing according to the operation of the operation unit 12 or the remote controller 20 by the user.

It is a block diagram which shows the internal structural example of one Embodiment of the projector which concerns on this invention. It is a schematic diagram which shows the coordinate system of the spatial light modulation element made from the liquid crystal panel which the projection device part of the projector which concerns on this invention has, and also an example of a response | compatibility with the test pattern for focus adjustment which the projector which concerns on this invention uses Show. It is a schematic diagram which shows the external appearance of the remote control of the projector which concerns on this invention. It is a flowchart which shows the process sequence in which the projector which concerns on this invention automatically projects the test pattern for focus adjustments to the center part of a screen. It is a schematic diagram which shows the camera image imaged with the camera part of the projector which concerns on this invention. It is a schematic diagram which shows the correspondence of the coordinate system of the spatial light modulation element made from the liquid crystal panel of the projector which concerns on this invention, and the test pattern for focus adjustment. It is a schematic diagram which shows the actual projection state when the projector which concerns on this invention projects the test pattern for focus adjustment. It is a flowchart which shows the process sequence in which the projector which concerns on this invention projects a test pattern for focus adjustment to the center part of a screen manually. It is a schematic diagram which shows the test pattern for focus adjustment which a conventional projector uses. It is a schematic diagram which shows the state which looked at the projection state by the projector when the test pattern for focus adjustment is set only in the center part of the image which should be projected originally from the front of the screen.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Projection lens 3 Camera part 7 Test pattern image switching part 8 Projection device part 8a Spatial light modulation element (panel)
9 Projection lens drive unit 10 System control unit 11 Detection unit 12 Operation unit 20 Remote control (remote control device)
S screen 3I captured image FP test pattern for focus adjustment

Claims (2)

A spatial light modulation unit that generates modulated light representing a rectangular image, a projection unit that projects the modulated light modulated by the spatial light modulation unit onto a projection target, and a test pattern image including a focus adjustment test pattern A test pattern image generating unit that spatially modulates the spatial light modulation unit, and an imaging unit that captures a projection state of the image projected by the projection unit, and the imaging unit captures the projection state of the test pattern image. In the projector that adjusts the focus of the projected image based on the image obtained,
From the relative positional relationship between the test pattern image on the image captured by the imaging unit and the image of the projection object, the image corresponding to the center of the image of the projection object on the image captured by the imaging unit A calculation means for obtaining a position on an image generated by the spatial light modulation means;
A projector comprising: control means for causing the center of the focus adjustment test pattern to coincide with a position on an image generated by the spatial light modulation means obtained by the calculation means.   The arithmetic means obtains the positions of the four corners of the test pattern image and the image of the projection object on the image picked up by the image pickup means, and the spatial light modulation means includes the obtained positions of the four corners of the test pattern image. Based on the correspondence with the four corners of the image to be generated, the positions of the four corners of the image of the projection object on the image captured by the imaging unit correspond to the positions on the image generated by the spatial light modulation unit. The position on the image generated by the spatial light modulation means corresponding to the center position of the image of the projection object on the image picked up by the image pickup means is obtained. The projector according to 1.

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