JP3925548B2 - Projection device with photographing function and projection image photographing system - Google Patents

Description

  The present invention relates to a projection apparatus with a photographing function and a projection image photographing system having a function of photographing a screen in a state where an image is projected in addition to a function of projecting an image onto a screen.

  In recent years, in presentations and meetings, documents (characters, charts, etc.) stored as data in a personal computer are enlarged and projected on a screen using a projector. A projector generally has a configuration in which image information of a document input as a video signal from a PC or the like is converted into projection light by an image conversion element such as a liquid crystal or a micromirror array.

On the other hand, when using a projector in a meeting or the like, a whiteboard is used for the screen, and characters and lines (underlines and ruled lines) are often added to the projected document. By taking a picture of a screen (white board), the document in which the characters and the like are written is converted into digital data (image data). As an apparatus for converting a document in which characters or the like are written in this way into digital data, for example, Patent Document 1 below describes a projector equipped with a digital camera.
JP-A-11-305335 (see FIG. 1)

  However, a projector equipped with a digital camera as described above usually has two types of optical systems: a projection lens on the projector side and a photographing lens on the digital camera side. Therefore, during use, it is essential to adjust the angle of view (zoom ratio) and focus of the projected image on the projector side, and to adjust the angle of view (zoom ratio) and focus on the digital camera accordingly. There was a problem that the preparation work was complicated.

  The present invention has been made in view of such conventional problems, and an object thereof is to provide a projection device with a photographing function and a projection image photographing system that facilitate the photographing operation of a screen on which an image is projected.

In order to solve the above-mentioned problems, in the invention of claim 1, in addition to the function of projecting an image on a screen, the projection device with a photographing function having a function of photographing a screen in a state where an image is projected, Image conversion means for converting into projection light, projection optical system capable of zoom and focus adjustment for projecting the projection light converted by the image conversion means, and imaging means for taking an image projected on the screen And an imaging optical system capable of zooming and focusing that forms an optical image picked up by the imaging means, and when the user performs a zoom operation of the projection optical system, Drive the optical system to change its zoom ratio, readjust the focus, and simultaneously project the zoom ratio for the imaging optical system Controlling the zoom to match the optical system, and it was characterized by a control means for re-adjusting the focus.

In this configuration, since the adjustment position of the imaging optical system is controlled in conjunction with the adjustment position of the projection optical system, the position adjustment of the imaging optical system is facilitated.

  According to a second aspect of the present invention, there is provided drive means for driving the imaging optical system, and the control means adjusts the position of the imaging optical system by the drive means. The zoom ratio of the imaging optical system is controlled to a zoom ratio corresponding to the zoom ratio of the projection optical system by driving to a position corresponding to the zoom ratio.

In such a configuration, when the zoom ratio of the projection optical system is changed, the zoom ratio of the imaging optical system is automatically controlled to the zoom ratio corresponding to the projection optical system side in conjunction with the change .

  According to a third aspect of the invention, there is provided position information detection means for detecting position information indicating a position adjustment state of the projection optical system, wherein the control means is detected by the position information detection means. Based on the position information, the drive means drives the position of the imaging optical system to a position corresponding to the adjustment position of the projection optical system.

Even in such a configuration, when the zoom ratio of the projection optical system is changed, the zoom ratio of the imaging optical system is automatically controlled to the zoom ratio corresponding to the projection optical system side in conjunction with the change.

  According to a fourth aspect of the present invention, there is provided projection-side drive means for driving the projection optical system, imaging-side drive means for driving the imaging optical system, and distance information indicating the distance to the screen. Distance information acquisition means for acquiring, based on the distance information acquired by the distance information acquisition means, the projection side drive means drives the projection optical system, and the imaging side drive means The focus position in the projection optical system and the imaging optical system is controlled by driving the imaging optical system.

In such a configuration, the focus position in the projection optical system and the imaging optical system is adjusted to a position corresponding to the distance to the screen .

  According to a fifth aspect of the present invention, the imaging optical system includes a projection side driving unit that drives the projection optical system, an imaging side driving unit that drives the imaging optical system, and the imaging side driving unit. An autofocus unit that drives the system and controls the focus position of the imaging optical system at a peak position where the contrast value of the image captured by the imaging unit is maximized, and the control unit includes the autofocus unit. Based on the focus position of the imaging optical system controlled by the above, the projection optical system is driven by the projection side driving means to control the focus position of the projection optical system.

In such a configuration, the focus position in the imaging optical system is automatically controlled, and the focus position in the projection optical system is controlled based on the focus position.

  The invention of claim 6 further comprises position information detecting means for detecting position information indicating an adjustment position of the projection optical system, and an image pickup side drive means for driving the image pickup optical system, The control means controls the focus position of the imaging optical system by driving the imaging optical system by the imaging side driving means based on the position information detected by the position information detection means.

In such a configuration, when the focus position in the projection optical system is adjusted, the focus position of the imaging optical system is adjusted in conjunction therewith .

In addition to the function of projecting an image on a screen, the invention of claim 7 has a function of photographing a screen in a state of projecting an image, and zoom and focus adjustment used for image projection are possible. A computer having a projection optical system having a projection optical system and an imaging optical system capable of adjusting zoom and focus used for photographing a screen has a zoom operation of the projection optical system by a user. In response to this, the projection optical system is driven to change the zoom ratio, and the focus is readjusted. At the same time, the imaging optical system is zoomed to match the zoom ratio with the projection optical system. A program for controlling the position of the lens and functioning as a control means for readjusting the focus is provided .

In the invention of claim 8, the zoom ratio control in the imaging optical system further indicates the zoom ratio of the imaging optical system corresponding to the relationship between the zoom ratio of the projection optical system and the distance to the screen. A zoom ratio setting table is provided.

In the invention of claim 9, the projection optical system showing the relationship among the distance to the screen, the zoom ratio, and the position of the focus lens in each of the projection optical system and the imaging optical system; A focus setting table for adjusting the positions of both focus lenses of the imaging optical system is provided .

In the projection apparatus with a photographing function of the present invention, the position adjustment work in the imaging optical system is linked with the position adjustment work of the projection optical system, so that the screen on which the image is projected can be easily photographed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)

  FIG. 1 is a block diagram showing a schematic configuration of a projector 1 according to the first embodiment of the present invention. The projector 1 has a function of photographing a screen in a state where an image is projected, and mainly includes a control unit 2, an image processing / control unit 3, an image recording unit 4, a user control device 5, a projection unit 6, and a camera. The unit 7 and the distance detection unit 8 are configured.

  The user control device 5 operates the projector 1 by the user, for example, switching of an image (projected image) to be projected on the screen, adjusting various angles of view of the projected image, adjusting the focus, and infrared rays emitted from an infrared remote controller. A signal reception circuit is included, and an operation signal corresponding to the operation of the operation key or the infrared remote controller is sent to the control unit 2.

  The control unit 2 includes a CPU, a program ROM, a RAM, and peripheral circuits (not shown) including an input / output interface. And the control part 2 functions as a control means of this invention by controlling each part of the projector 1 based on the program stored in program ROM.

  The image processing / control unit 3 generates a display signal based on an image file recorded in the image recording unit 4 or presentation document data, or an external input signal input from an external device connected to the projector 1. Is generated and sent to the projection unit 6. The external input signal is, for example, an image signal or video signal of a projection document (characters, diagrams, etc.) sent from a personal computer, or an input signal such as characters or line drawings sent from a tablet. The image processing / control unit 3 generates an image file based on the image data sent from the camera unit 7 and records it in the image recording unit 4 when the user performs a shooting operation. The image recording unit 4 is, for example, a flash memory built in the projector 1 or a removable memory card that is detachably attached to the projector 1.

  The projection unit 6 includes a display unit 61, a projection lens 62 (projection optical system of the present invention), a focus motor 63, a zoom motor 64, and a motor drive control unit 65. The display unit 61 includes a light source such as a krypton lamp, an image conversion element such as a liquid crystal or a micromirror array for converting light from the light source into projection light, a drive circuit that drives the image conversion element, and the like. The projection light according to the display signal sent from the unit 3 is output. The projection light output from the display unit 61 is irradiated onto the screen via the projection lens 62, thereby displaying a document or an image on a screen.

  The projection lens 62 includes a focus lens that can move in the optical axis direction and a plurality of optical lenses that constitute a zoom lens. The focus lens is moved by a drive mechanism using the focus motor 63 as an actuator, and the zoom lens is The zoom motor 64 is configured to be moved by a drive mechanism using an actuator. In addition, the focus motor 63 and the zoom motor 64 are individually driven by the motor drive control unit 65 based on the view angle control signal and the focus control signal sent from the control unit 2, so that the motor drive control unit 65 and the motor drive control unit 65 of the present invention are used. It functions as a projection side driving means.

  The camera unit 7 includes an imaging lens 71 (imaging optical system of the present invention), an image sensor 72, a signal processing unit 73, a focus motor 74, a zoom motor 75, and a motor drive control unit 76. The image sensor 72 is, for example, a CCD or CMOS type solid-state imaging device, and when an imaging operation is performed by the user, the optical image of the subject imaged by the imaging lens 71 is converted into an imaging signal by photoelectric conversion and output. . The signal processing unit 73 removes noise from the output signal of the image sensor 72 and converts it into a digital signal, which is output to the image processing / control unit 3. Although not shown, the camera unit 7 includes a drive circuit that drives the image sensor 72.

  The imaging lens 71 includes a focus lens that can move in the optical axis direction and a plurality of optical lenses that constitute a zoom lens. The focus lens is moved by a drive mechanism that uses the focus motor 74 as an actuator, and the zoom lens is The zoom motor 75 is configured to be moved by a drive mechanism using an actuator. Further, the focus motor 74 and the zoom motor 75 are individually driven by the motor drive control unit 76 based on the view angle control signal and the focus control signal sent from the control unit 2, so that the focus motor 74 and the zoom motor 75 are combined with the motor drive control unit 76. It functions as a projection side driving means.

  The distance detection unit 8 is distance information acquisition means of the present invention, and includes an infrared generation device and a pair of light receiving sensors. The distance detection unit 8 emits infrared rays and the like, receives the reflected light, and screens (subjects) according to the principle of triangulation. ) And the detection result is output to the control unit 2.

  In the projector 1, the projection lens 62 and the imaging lens 71 are arranged so that the projection direction of the image and the shooting direction substantially coincide with each other when the distance from the screen is within a predetermined distance range.

  Next, the operation of the projector 1 having the above configuration according to the present invention will be described. FIG. 2 is a flowchart showing the operation of the projector 1 after the power is turned on.

  When the projector 1 starts to operate when the power is turned on, the projection lens 62 and the imaging lens 71 are driven to initialize the respective zoom ratios (step SA1), and then the projection of the document or image is started (step SA2). . In addition, the distance detection unit 8 starts an operation of detecting the distance to the clean (projection distance, subject distance) at predetermined intervals (step SA3). The detected distance is stored in the RAM of the control unit 2 each time.

  Subsequently, the zoom ratio of the imaging lens 71 is controlled to a predetermined value based on the distance detected here and the zoom ratio on the projection lens 62 side (predetermined predetermined zoom ratio such as 1: 1). This ensures that almost the entire image captured by the image sensor 72 is occupied by the image projected on the screen. At the same time, the focus of the projection lens 62 is controlled based on the detected distance and the zoom ratio after initialization, and the focus of the imaging lens 71 is controlled based on the detected distance and the zoom ratio after the above control is performed. To do. In other words, the image being projected is focused, and at the same time, the captured image is focused in advance (step SA4).

  Here, the control of the zoom ratio in the imaging lens 71 described above is data stored in advance in the program ROM of the control unit 2, and the zoom ratio of the projection lens 62 and the distance to the screen (projection distance, subject distance). ) Based on a zoom ratio setting table indicating an optimal zoom ratio corresponding to the relationship with (). Further, the position adjustment of the focus lens of both the projection lens 62 and the imaging lens 71 is performed in advance by the program of the control unit 2 corresponding to the projection lens 62 and the imaging lens 71 separately from the table data for setting the zoom ratio. The data stored in the ROM, and the focus setting table showing the relationship between the distance to the screen (projection distance, subject distance), zoom ratio, and appropriate focus lens position in each optical system is used. Determined individually.

  Thereafter, when the user performs an angle-of-view changing operation (YES in step SA5), the zoom lens on the projection lens 62 side is driven accordingly to change the zoom ratio, and the focus is set according to the changed zoom ratio. At the same time, also on the imaging lens 71 side, the position of the zoom lens is controlled so that the zoom ratio matches the projection lens 62 side, and the focus is readjusted according to the changed zoom ratio (step SA6). . If the projector 1 is moved at any point in time and the distance detected by the distance detection unit 8 changes (YES in step SA7), the imaging lens 71 is changed according to the newly detected distance. The zoom ratio and the focus of the projection lens 62 and the imaging lens 71 are readjusted (step SA8).

  When the user performs a shooting operation (YES in step SA9), the camera unit 7 performs an imaging process on a screen on which an arbitrary document or image is projected (step SA10), and the captured image is captured. Is recorded in the image recording unit 4 (step SA11). Thereafter, the process returns to step SA5, and the above-described operation is repeated until the power is turned off.

  As described above, in the present embodiment, the focus positions of both the projection lens 62 and the imaging lens 71 are automatically controlled to positions according to the distance to the screen, and the user can change the angle of view. When there is, the zoom ratio of the imaging lens 71 is controlled to a zoom ratio corresponding to the zoom ratio of the projection lens 62 in conjunction with the zoom ratio of the projection lens 62. Therefore, when shooting a screen with an image projected thereon, it is not necessary to individually change and adjust the zoom ratio and focus of the imaging lens 71, so it is easy to use and the screen on which the image is projected is shot. Can be easily performed.

  In the present embodiment, focus control on the imaging lens 71 side is always performed simultaneously with the projection lens 62 side, and the zoom ratio is always controlled to a zoom ratio corresponding to the zoom ratio on the projection lens 62 side. The following may be used. For example, the zoom ratio and focus on the imaging lens 71 side may be performed just before the imaging operation only when the user performs a shooting operation. Further, the focus control in the projection lens 62 and the imaging lens 71 may be performed only immediately after the power is turned on, except for the adjustment accompanying the change of the zoom ratio.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 3 is a block diagram showing a schematic configuration of projector 101 according to the present embodiment.

  In the projector 101, the above-described distance detection unit 8 is eliminated, and an auxiliary light emitting unit 102 is provided. The auxiliary light emitting unit 102 includes a light source such as white light or red light and a driving circuit thereof, and emits auxiliary light for imaging as necessary. In the present embodiment, since the control unit 2 is the same as that shown in FIG. 1 except that it functions as the autofocus means of the present invention, the description thereof is omitted by giving the same reference numerals.

  FIG. 4 is a flowchart showing the operation of the projector 101 after the power is turned on. When the projector 101 starts to operate when the power is turned on, the projection lens 62 and the imaging lens 71 are driven to initialize the respective zoom ratios (step SB1), and then projection of a document, an image, or the like is started (step SB2). .

  Further, the contrast AF is performed at regular time intervals, and the operation for acquiring the subject distance is started (step SB3). That is, the focus control of the imaging lens 71 in the camera unit 7 is performed by a known contrast AF method, and the above-described focus setting table for the imaging lens 71 is used from the zoom ratio and the position of the focus lens in the imaging lens 71 at that time. To start obtaining the subject distance. The detected distance is stored in the RAM of the control unit 2 each time. The distance acquired here is used as the projection distance, and the zoom ratio of the imaging lens 71 is controlled using the zoom ratio setting table described above, and the focus of the projection lens 62 is controlled using the focus setting table for the projection lens 62. (Step SB4).

  The subsequent operations in steps SB5 to SB11 are the same as those described in steps SA5 to SA11 shown in FIG.

  As described above, in the projector 101 according to the present embodiment, the focus position of the imaging lens 71 is automatically controlled, and the focus position of the projection lens 62 is automatically controlled in conjunction with the focus position. As in the above embodiment, when the user performs an angle of view change operation, the zoom ratio of the imaging lens 71 is controlled in conjunction with the zoom ratio of the projection lens 62 and corresponding to the zoom ratio of the projection lens 62. . Therefore, also in this embodiment, when shooting a screen in a state where an image is projected, it is not necessary to individually change and adjust the zoom ratio and focus of the imaging lens 71, so that it is easy to use. The photographing operation of the projected screen can be easily performed.

  Also in this embodiment, the zoom ratio on the imaging lens 71 side may be performed immediately before the imaging operation only when the user performs a shooting operation. Further, the focus control in the projection lens 62 and the imaging lens 71 may be performed only immediately after the power is turned on, except for the adjustment accompanying the change of the zoom ratio.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. FIG. 5 is a block diagram showing a schematic configuration of projector 201 according to the present embodiment.

  Unlike the projectors 1 and 101 described above, the projector 201 includes a projection unit 206 including a display unit 61, a projection lens 62, and a lens position detection unit 207. The display unit 61 is the same as that described above, and the projection lens 62 is the same as that described above except that the zoom ratio is changed and the focus adjustment is manually performed. The lens position detection unit 207 includes a position sensor that detects the position of each lens of the projection lens 62 moved by manual operation, and sends a position detection signal indicating the position to the control unit 2. In addition, about another structure, description is abbreviate | omitted by attaching | subjecting the same code | symbol to the part same as what was shown in FIG.1 and FIG.2.

  FIG. 6 is a flowchart showing the operation of the projector 201 after the power is turned on. When the projector 201 starts operating with power-on, it first starts projecting a document or an image (step SC1). Next, based on the lens position information detected by the lens position detection unit 207, the zoom ratio of the projection lens 62 is acquired and the projection distance is acquired (step SC2). The zoom ratio and the projection distance are acquired using the above-described focus setting table for the projection lens 62. Subsequently, based on the acquired zoom ratio and projection distance, the zoom ratio on the imaging lens 71 side is controlled to a zoom ratio according to the zoom ratio on the projection lens 62 side using the zoom ratio setting table described above, and the projection distance is set. The subject distance is used, and the focus is controlled using the focus setting table described above.

  After that, when the zoom ratio and focus of the projection lens 62 are manually operated by the user, the zoom ratio and focus on the imaging lens 71 side are automatically adjusted to the projection lens 62 side by the same method as described above. (Steps SC4 to SC7). When the user performs a shooting operation (YES in step SC8), the screen on which the document or image is projected is captured and the captured image is recorded in the image recording unit 4 (steps SC9 and SC10). Thereafter, the process returns to step SC4, and the above-described operation is repeated until the power is turned off.

  As described above, in the projector 201 of the present embodiment, when the zoom ratio and focus position of the projection lens 62 are set by the user, the zoom ratio of the imaging lens 71 corresponds to the zoom ratio of the projection lens 62 in conjunction therewith. And the focus position is automatically controlled. Therefore, also in this embodiment, when shooting a screen in a state where an image is projected, it is not necessary to individually change and adjust the zoom ratio and focus of the imaging lens 71, so that it is easy to use. The photographing operation of the projected screen can be easily performed.

  In the first to third embodiments described above, the case where the imaging lens 71 is capable of focus control has been described. For example, the imaging lens 71 having a deep depth of field is used. In a configuration in which the focus position of the imaging lens 71 is fixed, preparation work prior to use of the imaging function is not required even if the zoom ratio of the imaging lens 71 is linked to the zoom ratio on the projection lens 62 side. Can be improved.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. FIG. 7 is a block diagram showing a schematic configuration of the projection image photographing system according to the present invention. The projection image capturing system according to the present embodiment includes a projector 301 and a digital camera 401 connected via a USB cable 501.

  First, the configuration of the projector 301 will be described. The projector 301 is an image projection apparatus according to the present invention. As shown in the figure, the projector 301 is similar to the projector 1 shown in FIG. 1 in the first embodiment, the image processing / control unit 3, A user control device 5, a distance detection unit 8, a display unit 61, a projection lens 62, a focus motor 63, a zoom motor 64, and a motor drive control unit 65 are provided. Each of the above-mentioned units has the same function as that shown in FIG. 1, and in the projector 301, the zoom ratio of the projection lens 62 can be changed, and the focus of the image projected on the screen is It can be automatically controlled based on the detection distance of the distance detector 8.

  In addition, the projector 301 is provided with a USB interface 303 which is a transmission unit of the present invention, thereby enabling data communication with the digital camera 401. Further, a program ROM (not shown) constituting the control unit 2 stores a program for causing the projector 301 to perform an operation described later.

  On the other hand, a digital camera 401 is an imaging device of the present invention, and an imaging lens 71 having the same function as that provided in the camera unit 7 in the projector 1 shown in FIG. 1 in the first embodiment, An image sensor 72, a signal processing unit 73, a focus motor 74, a zoom motor 75, and a motor drive control unit 76 are provided. Also in FIG. 7, the drive circuit for driving the image sensor 72 is omitted.

  The digital camera 401 has an AF function, and includes a distance detection unit 402 that detects a subject distance by a method similar to that provided in the projector 301. Further, the digital camera 401 includes a display unit 403, a DRAM 404, an image recording unit 405, a key input unit 406, and a USB interface 407 that is a receiving unit of the present invention, as well as a general digital camera. It has the control part 408 which controls.

  The image recording unit 405 is a non-volatile memory that records an image captured by the image sensor 72, and is, for example, a flash memory that is built in or removable from the camera body. The display unit 403 is a liquid crystal monitor that displays an image captured by the image sensor 72 or an image recorded in the image recording unit 405, and a drive circuit thereof. The DRAM 404 is mainly used as a working memory when the control unit 408 compresses / decompresses an image captured by the image sensor 72.

  The key input unit 406 includes a power key, a shutter key, a mode switching key for enabling various setting operations by the user, and the like. In the digital camera 401, while a through image is displayed on the display unit 403, the image is projected on the screen by the projector 301 separately from the normal recording (shooting) mode in which the captured image is recorded when the shutter key is pressed. A linked shooting mode is provided for shooting images and the like.

  The control unit 408 includes a CPU, a program ROM, a RAM, and a peripheral circuit (not shown) including an input / output interface. Then, the above-described units are controlled based on the program stored in the program ROM, and the above-described image compression / decompression is performed. On the other hand, the digital camera 401 performs the operation described later, thereby functioning as the control unit of the present invention. In the program ROM of the control unit 408, a zoom ratio setting indicating an optimum zoom ratio corresponding to the relationship between the zoom ratio of the projection lens 62 of the projector 301 and the distance to the screen (projection distance, subject distance) is set. The table is stored.

  Next, in the projector 301 and the digital camera 401 having the above configuration, the operation according to the invention in a state where both are connected by the USB cable 501 will be described with reference to FIG.

  FIG. 8 is a flowchart showing an operation when the projector 301 performs projection in the interlocking projection mode and an operation when the digital camera 401 sets the interlocking shooting mode. The linked projection mode on the projector 301 side is a mode that is automatically set when, for example, the digital camera 401 is connected when the power is turned on or when the digital camera 401 is connected at an arbitrary time after the power is turned on. Further, the linked shooting mode on the digital camera 401 side can be set only when connected to the projector 301, for example, and is a shooting operation mode set in accordance with a mode setting operation by the user.

  The digital camera 401 first starts focus control in accordance with the subject distance detected by the distance detection unit 402 in accordance with the setting of the linked shooting mode (step SD1), and then requests the projector 301 to transmit field angle information. (Step SD2). The angle-of-view information is zoom ratio information that is updated and stored in the control unit 2 every time the projector 301 is operated by the user.

  At this time, the projector 301 in the interlocking projection mode projects an image with an arbitrary zoom ratio set by the user's operation from the user control device 5, and automatically controls the focus by the AF function that the projector 301 has. . If there is a request for transmission of angle of view information from the digital camera 401 (YES in step SE), the zoom ratio at that time is transmitted to the digital camera 401 as the angle of view information (step SE2).

  In addition, the projector 301 drives the zoom lens of the projection lens 62 accordingly to adjust the zoom ratio if there is a view angle changing operation by the user regardless of whether or not the view angle information is requested to be transmitted (YES in step SE3). Change and store the information (step SE). At this time, if the angle of view information has already been transmitted to the digital camera 401 in response to the transmission request (YES in step SE5), the changed angle of view information is transmitted to the digital camera 401 (step SE6). If the angle of view information has not yet been transmitted to the digital camera 401 (NO in step SE5), the process returns to step SE1 as it is, and the above-described processing is repeated. In other words, once the angle of view information is transmitted in response to a transmission request from the digital camera 401, the changed zoom magnification is automatically transmitted to the digital camera 401 every time the angle of view is changed.

  On the other hand, if the digital camera 401 can receive the angle of view information (YES in step SD3), the digital camera 401 drives the zoom lens of the imaging lens 71 in accordance with the received angle of view information, and the zoom ratio is substantially the same as that of the screen for imaging. The zoom ratio is controlled so that the entire surface is occupied by the projected image (step SD4). Such control is performed based on the zoom ratio setting table described above.

  Thereafter, the process waits for a shooting operation by the user. If there is no shooting operation (NO in step SD5), the process returns to step SD3. While waiting for a shooting operation, whenever the angle of view information is received from the projector 301, the zoom ratio of the imaging lens 71 is changed accordingly. Thereafter, when there is a shooting operation by the user (YES in step SD5), an imaging process is performed with a screen on which an arbitrary document or image is projected (step SD6), and the captured image is recorded as an image. Is recorded in the unit 405 (step SD7). Thereafter, the process returns to step SD3, and the above-described operation is repeated until the linked shooting mode is canceled.

  As described above, in the projection image capturing system of the present embodiment, when the angle of view of the projector 301 is adjusted by the user, the angle of view of the digital camera 401 corresponds to the angle of view on the projector 301 side in conjunction with the adjustment. It is automatically controlled to an appropriate angle of view.

  Therefore, for example, while setting a normal recording mode in the digital camera 401 and confirming a through image displayed on the display unit 403, the shooting direction (the optical axis direction of the imaging lens 71) is set in advance to the projection direction on the projector 301 side ( If it is made to substantially coincide with the optical axis of the projection lens 62, the zoom ratio of the imaging lens 71 in the digital camera 401 is individually adjusted or changed when shooting a screen on which an image is projected thereafter. Work is unnecessary. Therefore, it is easy to use, and it is possible to easily perform the photographing operation of the screen on which the image is projected.

  In the present embodiment, a case has been described in which projector 301 has distance detection unit 8 and includes an AF function for controlling the focus of projection lens 62 based on a distance uniquely detected using it. The following may be used. For example, the distance detector 8 on the projector 301 side is abolished, usually only manual focus adjustment (including adjustment by key operation) is possible, the digital camera 401 is connected, and the above-described linked projection mode is set. When it is, focus control based on the distance information received from the digital camera 401 side may be performed.

  In this embodiment, transmission / reception of angle-of-view information between the projector 301 and the digital camera 401 is made possible by USB connection, but other communication by wire or wireless (including infrared communication) is also possible. It is good also as a structure which transmits and receives view angle information by a system.

  In addition, as the digital camera 401, a zoom ratio setting table indicating an optimal zoom ratio corresponding to the relationship between the zoom ratio of the projection lens 62 of the projector 301 and the distance to the screen (projection distance, subject distance) is prepared in advance. However, for example, the data constituting the zoom ratio setting table may be acquired from the projector 301 side when the above-described linked shooting mode is set. Of course, in that case, it is necessary to prepare data corresponding to the model of the digital camera 401 on the projector 301 side. Furthermore, in order to be able to use different types of digital cameras 401, a plurality of types of the above data are prepared in the projector 301, model information is received from the digital camera 401 in advance, and data of the corresponding models is obtained. What is necessary is just to make it transmit to the digital camera 401.

1 is a block diagram showing a schematic configuration of a projector according to a first embodiment of the invention. It is a flowchart which shows the operation | movement after power activation of the projector. It is a block diagram which shows schematic structure of the projector which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the operation | movement after power activation of the projector. It is a block diagram which shows schematic structure of the projector which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the operation | movement after power activation of the projector. It is a block diagram which shows schematic structure of the projection image imaging system which concerns on the 4th Embodiment of this invention. It is a flowchart which shows the operation | movement in the interlocking projection mode of the projector and the operation | movement in the interlocking imaging mode of a digital camera in the projection image imaging system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Control part 6 Projection part 7 Camera part 8 Distance detection part 61 Display part 62 Projection lens 63 Focus motor 64 Zoom motor 65 Motor drive control part 71 Imaging lens 72 Image sensor 73 Signal processing part 74 Focus motor 75 Zoom motor 76 Motor Drive control unit 101 Projector 102 Auxiliary light emitting unit 201 Projector 206 Projection unit 207 Lens position detection unit 301 Projector 303 USB interface 401 Digital camera 407 USB interface 408 Control unit

Claims (9)

In addition to the function of projecting an image on the screen, in the projection device with a photographing function having a function of photographing the screen in a state of projecting an image,
Image conversion means for converting image information into projection light;
A projection optical system capable of adjusting zoom and focus, projecting the projection light converted by the image conversion means onto a screen;
Imaging means for imaging an image projected on the screen;
An imaging optical system capable of zooming and focusing, which forms an optical image picked up by the image pickup means;
When the user performs a zoom operation on the projection optical system, the projection optical system is driven accordingly to change the zoom ratio, and the focus is readjusted. And a control means for controlling the zoom to adjust the zoom ratio to the projection optical system and re-adjusting the focus . Drive means for driving the imaging optical system;
The control means drives the position of the imaging optical system to a position corresponding to the adjustment position of the projection optical system by the driving means, thereby adjusting the zoom ratio of the imaging optical system of the projection optical system. The projection apparatus with a photographing function according to claim 1, wherein the zoom ratio is controlled to a zoom ratio corresponding to the zoom ratio. Position information detection means for detecting position information indicating the position adjustment state of the projection optical system,
The control unit drives the position of the imaging optical system to a position corresponding to the adjustment position of the projection optical system by the driving unit based on the position information detected by the position information detection unit. The projection apparatus with a photographing function according to claim 2. Projection-side drive means for driving the projection optical system;
Imaging side driving means for driving the imaging optical system;
Distance information acquisition means for acquiring distance information indicating the distance to the screen,
The control means drives the projection optical system by the projection side driving means based on the distance information acquired by the distance information acquisition means, and drives the imaging optical system by the imaging side driving means. The projection apparatus with a photographing function according to claim 1, wherein a focus position in the projection optical system and the imaging optical system is controlled. Projection-side drive means for driving the projection optical system;
Imaging side driving means for driving the imaging optical system;
Auto-focus means for driving the imaging optical system by the imaging-side drive means and controlling the focus position of the imaging optical system at a peak position where the contrast value of the image taken by the imaging means is maximized ,
The control means controls the focus position of the projection optical system by driving the projection optical system by the projection side drive means based on the focus position of the imaging optical system controlled by the autofocus means. The projection apparatus with a photographing function according to claim 1 or 2.   The control means controls the focus position of the imaging optical system by driving the imaging optical system by the imaging side driving means based on the position information detected by the position information detection means. The projection apparatus with a photographing function according to claim 3. In addition to the function to project an image to the screen, it has a function to shoot the screen in a state in which the image is projected, and a projection optical system that can adjust the zoom and focus used to project the image, and is used to shoot the screen. A computer having a projection device with a photographing function including an imaging optical system capable of adjusting zoom and focus ;
When there is a zoom operation of the projection optical system by the user, the projection optical system is driven accordingly to change the zoom ratio, and the focus is readjusted, and at the same time for the imaging optical system, A program for controlling the position of a zoom lens so as to adjust the zoom ratio to the projection optical system and for functioning as a control means for readjusting the focus . And a zoom ratio setting table for controlling the zoom ratio in the imaging optical system, the zoom ratio of the imaging optical system corresponding to the relationship between the zoom ratio of the projection optical system and the distance to the screen. The projection apparatus with a photographing function according to claim 4. Position adjustment of the focus lens of both the projection optical system and the imaging optical system showing the relationship between the distance to the screen, the zoom ratio, and the position of the focus lens in each of the projection optical system and the imaging optical system The projection apparatus with a photographing function according to claim 4, further comprising a focus setting table for performing the operation.

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