JP2011188408A - Image display system, image input apparatus, and method of controlling image input apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent video that a user does not desire from being displayed. <P>SOLUTION: A projector 10 is connected to a document camera 50 via a USB cable 90. The user moves an arm in the document camera 50 for switching between a photographing state and a non-photographing state. An arm opening/closing detection unit 75 detects a state of the arm. When the arm opening/closing detection unit 75 detects that the arm is in a non-photographing state, a control unit 70 operates a circuit control unit 77 and cuts off the document camera 50 from the projector 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display system including an image input device and an image display device, and an image input device.

  In recent years, using a projector and a document camera and projecting an image captured by the document camera with a projector has been effectively used in presentations and the like. A projector and a document camera need to be portable, and conventionally, a document camera has an arm portion that can be folded as disclosed in Patent Document 1 and the like.

Japanese Patent Laid-Open No. 2004-104341

  However, when the conventional document camera is connected to a projector using a USB cable in a state where the arm is folded, an image that is photographed in the folded state and is not desired by the user is projected onto the screen. Problem has occurred.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to prevent an image not desired by a user from being displayed.

  In order to solve at least a part of the above problems, the present invention can be realized as the following forms or application examples.

  Application Example 1 In an image display system in which an image input device and an image display device are connected and an image obtained by the image input device is displayed on the image display device, the image input device captures an image of a subject. A movable holding unit that holds the imaging unit and can selectively take a shooting state in which the subject can be shot and a non-shooting state in which the subject is not shot, and the movable holding unit takes the shooting A state detection unit that detects whether the state is the non-photographing state, and when the movable detection unit is determined to be in the non-photographing state by the state detection unit, The transmission path for exchanging data with the image display device is logically disconnected, and the transmission path is logically disconnected when the state detection unit determines that the movable holding unit is in the shooting state. In The image display system, characterized in that it comprises a control unit for connection to.

  In the image display system of this application example, the operator can switch between a photographing state in which the subject can be photographed and a non-photographing state in which the subject is not photographed by moving the movable holding unit in the image input device. Whether the movable holding unit is in the state is detected by the state detection unit, and when it is determined as the non-photographing state, the control unit logically determines between the image input device and the image display device. It becomes the cutting state cut | disconnected by. For this reason, even if the imaging unit outputs a meaningless image signal when the movable holding unit is in a non-photographing state, the image is not transmitted to the image display device, which is not desired by the user. It is possible to prevent an image from being displayed.

  Application Example 2 In the image display system according to the application example described above, the image input device and the image display device are connected via a USB cable, and the image input device includes the control unit. The control unit realizes the disconnected state by disconnecting a pull-up resistor connected to the data line of the USB cable, and realizes the connected state by connecting the pull-up resistor. Is provided.

  Furthermore, by connecting the image input device and the image display device with a USB cable, it is possible to provide an image display system that is easy to set up and highly convenient. In addition, since the connection state / disconnection state can be switched simply by connecting / disconnecting the pull-up resistor connected to the data line of the USB cable, the configuration is simple. Further, since the control is for the data line, the image display device can be surely determined whether it is connected or disconnected with the image input device, and the controllability is high.

  Application Example 3 In the image display system according to the application example described above, the control unit determines that it is a timing at which the movable holding unit switches from the non-shooting state to the shooting state, and switches to the connected state. A USB communication establishment unit that establishes communication with the image display device using the USB standard.

  In addition, since the communication is immediately established after the image input device and the image display device are switched to the connected state, the workability is excellent.

  Application Example 4 In the image display system according to the application example, the USB communication establishment unit includes a standby state determination unit that determines whether the image display device is in a standby state, and the standby state determination And an activation unit that switches the image display device from the standby state to the on state when the standby state is determined by the unit.

  As described above, the standby state determination unit that determines whether or not the image display device is in the standby state is provided, and after the image input device and the image display device are switched to the connected state, the image display device is in the standby state. In such a case, an image display system with better workability can be provided by automatically switching to the on state.

  Application Example 5 In the image display system according to the application example, the image input device is a document camera, and the image display device is a projector.

  In such an image display system, documents such as manuscripts and specimens can be easily captured with a document camera, and the captured images can be projected with a projector, making school lessons and presentations more attractive. Can be made.

  Application Example 6 The image input apparatus according to this application example can be applied to an image input apparatus that inputs an image and causes the image display apparatus to display the image. Such an image input device selectively takes an imaging unit that captures a subject, a capturing state that holds the imaging unit, and that can capture the subject, and a non-capturing state that does not capture the subject. A movable holding unit to be obtained, a state detecting unit for detecting whether the movable holding unit is in the shooting state or the non-shooting state, and the movable holding unit is in the non-shooting state by the state detecting unit. When the determination is made, the transmission path for exchanging data with the image display device is logically disconnected, and the state detection unit determines that the movable holding unit is in the shooting state. And a control unit for bringing the transmission path into a logically connected state with the image display device.

  Similar to the above-described image display system, the image input device described in this application example displays an image even when the imaging unit outputs a meaningless image signal when the movable holding unit is in a non-imaging state. Since it is not transmitted to the apparatus, it is possible to prevent an image that is not desired by the user from being displayed.

  Application Example 7 An image input apparatus control method according to this application example is an image input apparatus control method for inputting an image and causing the image display apparatus to display the image. A movable holding unit that holds the imaging unit and can selectively take a shooting state in which the subject can be shot and a non-shooting state in which the subject is not shot. Data is determined between the image input device and the image display device when it is determined whether the imaging state or the non-imaging state and the movable holding unit is determined to be in the non-imaging state. A transmission state in which the transmission path is logically disconnected, and when it is determined that the movable holding unit is in the photographing state, the transmission path is logically connected. It is characterized by.

  In the image input device to which the control method described in this application example is applied, even if the imaging unit outputs a meaningless image signal when the movable holding unit is in the non-shooting state, as in the above-described image display system. Since the image is not transmitted to the image display device, it is possible to prevent an image not desired by the user from being displayed.

  Application Example 8 Further, the control method of this application example may include a step of providing a connection means with an image display device using a USB cable. By using an image input device to which such a control method is applied and an image display device, it is possible to obtain the same effect as the above-described image display system.

  As an image display device of another application example, a configuration in which the constituent elements of the above-described image display system are added to the image input device may be employed.

  Further, the present invention can be realized in various modes, for example, a method for realizing each part of the image input device or the image display device, a computer program for realizing each part, and a computer thereof The present invention can be realized in the form of a recording medium that records the program, a data signal that includes the computer program and embodied in a carrier wave, and the like.

1 is an explanatory diagram showing a schematic configuration of a projector system 100 as an embodiment of the present invention. 2 is a perspective view of a photographing state of the document camera 50. FIG. 2 is a perspective view of a document camera 50 in a non-photographing state. FIG. 2 is an explanatory diagram showing an internal configuration of a projector 10 and a document camera 50. FIG. 7 is an explanatory diagram showing a configuration of a circuit control unit 77. FIG. It is a flowchart which shows a connection / disconnection switching process. 4 is a flowchart showing connection-time processing executed by the control units 20 and 70 of the projector 10 and the document camera 50. 4 is an explanatory diagram showing an internal configuration of a projection unit 34 of the projector 10. FIG.

  Embodiments of the present invention will be described below based on examples with reference to the drawings.

1. Hardware configuration:
FIG. 1 is an explanatory diagram showing a schematic configuration of a projector system as an embodiment of the present invention. As illustrated, the projector system 100 includes a projector 10 and a document camera 50 connected to the projector 10. The projector 10 and the document camera 50 are connected via a USB cable 90. An image photographed by the document camera 50 is displayed (projected) on the screen SC using the projector 10. Here, the image may be either a still image or a moving image (that is, video). In the present embodiment, the document camera 50 acquires a video.

  FIG. 2 is a perspective view of the document camera 50. As shown in the figure, the document camera 50 includes a base 52, a placement surface 54, an arm 56, a camera head 58, an operation panel 60, and the like. The placement surface 54 is provided on the base 52, and on which a subject T such as a paper (original or the like) on which characters or pictures are drawn, or a three-dimensional object is placed.

  The arm 56 holds the camera head 58. The arm 56 includes a lower arm 56a and an upper arm 56b. The lower arm 56a and the upper arm 56b are configured to be extendable and contractible in the axial direction (K direction in the figure). The lower arm 56a is attached to an arm attachment portion 62 disposed at one of the four corners of the base so as to be rotatable in the L direction in the drawing with the rotation shaft 62a as a rotation center.

  A camera head 58 is connected to the tip of the upper arm 56b. Specifically, the camera head 58 is connected to the upper arm 56b so as to be rotatable about the axis of the upper arm 56b (M direction in the drawing). The camera head 58 includes a lens, an LED, and a photoelectric conversion element such as a CCD. The user can point the camera head 58 in a direction suitable for photographing the subject T placed on the placement surface 54 by adjusting the movement positions in the K direction, the L direction, and the M direction described above. it can. The state where the subject T can be photographed, that is, the state shown in FIG.

  The operation panel 60 includes a plurality of buttons (button type switches), and inputs an operation command to the document camera 50 by the user.

  As described above, the document camera 50 of the present embodiment can adjust the movement positions in the K direction, the L direction, and the M direction, so that the arm 56 and the camera head 58 are changed from the shooting state of FIG. 2 to the state of FIG. Can be folded. That is, in FIG. 2, the camera head 58 is rotated to the back in the M direction in the drawing. Then, the entire length of the arm 56 is shortened by pushing the upper arm 56b into the lower arm 56a (downward in the K direction in the figure). Subsequently, the arm 56 is tilted downward in the L direction in the drawing. As a result, as shown in FIG. 3, the document camera 50 can fold the arm 56 and the camera head 58. This folded state is hereinafter referred to as “non-photographing state”. In the non-photographing state, the arm 56 and the camera head 58 are tilted, so that the height of the document camera 50 is shortened.

  According to the document camera 50 having the above configuration, the subject T placed on the placement surface 54 is photographed in the photographing state shown in FIG. 2, and an image signal indicating the image obtained by the photographing is output to the projector 10. To do. When the user finishes using the document camera 50, the user folds the arm 56 and the camera head 58 into the non-photographing state shown in FIG.

  FIG. 4 is an explanatory diagram showing the internal configuration of the projector 10 and the document camera 50. As shown in the figure, the projector 10 includes a control unit 20, a storage unit 22, an operation unit 24, a USB interface unit (USB I / F unit) 26, an input interface unit (input I / F unit) 28, an input source switching unit 30, An image processing unit 32 and a projection unit 34 are provided. A bus 36 connects the control unit 20 and the units 22 to 32 excluding the projection unit 34.

  The control unit 20 includes a CPU, a DSP (Digital Signal Processor), and the like, and operates according to a computer program stored in the storage unit 22 to control the units 22 to 32. The storage unit 22 stores image data and various computer programs. As various computer programs, a well-known USB module, a USB video class driver, an image display program, a connection processing program described later, and the like are stored.

  The operation unit 24 is for inputting an operation command from a user to the projector 10 and includes an operation panel (not shown), a remote control light receiving unit (not shown), and the like. The operation panel and the remote control are provided with an input source switching button (not shown) for switching the input source of an image displayed on the projector 10.

  The USB interface unit 26 is for exchanging control data, image data, and the like with an external device in accordance with a USB (Universal Serial Bus) standard. In this embodiment, the document camera 50 is connected to the USB interface unit 26 via the USB cable 90.

  The input interface unit 28 is an interface for exchanging control data and image data with an external device other than USB, and includes an RGB interface, a video interface, an S-video interface, and the like here. By using the input interface unit 28, it is possible to connect to an image input device other than the document camera 50, such as a video tape recorder (VTR) or a DVD player.

  The input source switching unit 30 switches the input source of an image displayed on the projector 10 by selecting one interface from the USB interface unit 26 and each interface provided in the input interface unit 28.

  The image processing unit 32 generates display image data for image display based on image data or video data input from the interface selected by the input source switching unit 30. As shown in FIG. 8, the projection unit 34 includes a light source 342, a light modulation element 344 (344R, 344G, 344B), a projection lens 346, an illumination optical system 341, a color separation optical system 343, a relay optical system 345, and combining optics. A system 347 and the like are provided. The projector 10 according to the present embodiment employs a transmissive liquid crystal panel as the light modulation element 344. White light emitted from the light source 342 is separated into red light, green light, and blue light via the illumination optical system 341, the color separation optical system 343, and the relay optical system 345, and the display generated by the image processing unit 32, respectively. After being light-modulated by the light modulation element 344 based on the image data for use, the light enters the combining optical system 347. The image light of each color modulated by the light modulation element 344 is synthesized by the synthesis optical system 347 and projected from the projection lens 346. The combining optical system 347 can be configured by a dichroic prism or the like.

  The document camera 50 includes a control unit 70, a storage unit 72, an operation unit 74, an arm opening / closing detection unit 75, a USB interface unit (USB I / F unit) 76, a circuit control unit 77, an illumination unit 78, an illumination control unit 80, and an imaging unit. 82, an image processing unit 84, and a resolution conversion unit 86. A bus 88 connects between the control unit 70 and the units 72 to 76, 80, 84, 86 excluding the illumination unit 78 and the imaging unit 82.

  The control unit 70 is configured by a CPU or the like, operates according to a computer program stored in the storage unit 72, and controls each unit 70 to 86 included in the document camera 50. The storage unit 72 stores image data and various computer programs. As various computer programs, a well-known USB module, a USB class driver, a program for connection / disconnection switching described later, and the like are stored. The operation unit 74 is for inputting an operation command from a user to the document camera 50 and includes an operation panel 60 (FIG. 1) provided in the document camera 50.

  The arm open / close detection unit 75 corresponding to the state detection unit of the present invention is a switch built in the arm attachment unit 62, and indicates whether the lower arm 56a is in the shooting state position or the non-shooting state position. To detect. The detection may be a mechanical type such as a push button or a non-contact type such as a magnetic sensor. In other words, the arm open / close detection unit 75 may use any type of sensor as long as the lower arm 56a can detect whether the lower arm 56a is in a shooting state or a non-shooting state. .

  Furthermore, the arm opening / closing detection unit 75 is replaced with a configuration for detecting the state of the lower arm 56a, and the state in which the upper arm 56b is most inserted into the lower arm 56a, that is, the entire length of the arm 56 is minimized. It can also be configured to detect the state. In this configuration, the fact that the arm 56 is in the non-photographing state is detected from a state in which the upper arm 56b is inserted most with respect to the lower arm 56a. In short, the arm opening / closing detection unit 75 may have any configuration as long as it can detect whether the arm 56 is in the shooting state or the non-shooting state.

  Returning to FIG. 4, the USB interface unit 76 is for exchanging control data, image data, and the like with an external device in accordance with the USB standard. In this embodiment, the USB interface unit 76 is connected to the USB interface unit 26 of the projector 10 via the USB cable 90. The circuit control unit 77 controls the logical connection of the data lines between the document camera 50 and the projector 10 while the document camera 50 and the projector 10 are physically connected by the USB cable 90.

  The illumination unit 78 is a light source such as an LED that irradiates the subject T with light. The illumination control unit 80 controls on / off of the illumination unit 78 and the like. The imaging unit 82 includes a photoelectric conversion element such as a CCD, a drive unit that performs AE (automatic exposure) / AF (automatic focus) control, and the like. The imaging unit 82 is built in the camera head 58 (FIG. 1). The image processing unit 84 performs image processing such as white balance on the image signal indicating the image obtained by the imaging unit 82. The resolution conversion unit 86 converts the resolution of the image obtained by the imaging unit 82 to the resolution requested by the projector 10. The request from the projector 10 is sent from the projector 10 via the USB I / F unit 76.

  The document camera 50 is configured to receive power from the projector 10 via the USB cable 90. This power supply is performed via the power supply line of the USB cable 90.

  The projector 10 and the document camera 50 configured as described above operate as follows to display an image of the subject T (FIG. 1). That is, on the document camera 50 side, when it is confirmed that the control unit 70 is connected to the projector 10 via the USB I / F unit 76, the control unit 70 controls the illumination control unit 80, the image processing unit 84, and the resolution conversion unit 86. Thus, the subject T placed on the placement surface 54 (FIG. 1) is imaged, and the image signal (image data) obtained by the imaging is temporarily stored in the storage unit 72. Thereafter, the control unit 70 transmits the image signal stored in the storage unit 72 to the projector 10 side via the USB I / F unit 76.

  On the projector 10 side, the control unit 20 receives an image signal sent from the document camera 50 via the USB I / F unit 26 and controls the image processing unit 32 to control the image signal based on the received image signal. Display image data. As a result, the projection unit 34 projects the projection light that is light-modulated based on the display image data. As a result, an image of the subject T is displayed on the screen SC (FIG. 1). Furthermore, in the present embodiment, the document camera 50 controls the logical connection of the data line with the projector 10 by operating the circuit control unit 77.

  FIG. 5 is an explanatory diagram showing the configuration of the circuit control unit 77. As shown in the figure, the circuit control unit 77 applies a predetermined voltage to the pull-up resistor 77a via the pull-up resistor 77a, the switch element 77b, and the switch element 77b connected to the data line D + of the USB cable 90. A power supply line 77c and a signal line 77d for inputting a predetermined control signal to the switch element 77b and controlling on / off of the switch element 77b are provided.

  When an ON signal is input to the signal line 77d and the switch element 77b is turned on, a voltage is applied to the pull-up resistor 77a (the pull-up resistor 77a is connected), and a voltage is supplied to the data line D +. As a result, the data line D + becomes a high level set by the USB standard, and the data line is logically connected between the document camera 50 and the projector 10. Hereinafter, this connection state is referred to as a “data line connection state”.

  On the other hand, when an off signal is input to the signal line 77d and the switch element 77b is turned off, supply of voltage to the pull-up resistor 77a is stopped (by cutting the pull-up resistor 77a). The voltages of both the data lines D + and D− become low level. As a result, the data line is logically disconnected between the document camera 50 and the projector 10. Hereinafter, this cut state is referred to as a “data line cut state”.

  A signal line 77d for controlling on / off of the switch element 77b is connected to the control unit 70 of the document camera 50, and the switch element 77b is on / off controlled by the control unit 70. That is, the controller 70 switches between the document camera 50 and the projector 10 between the data line connection state and the data line disconnection state. Next, the connection / disconnection switching process will be described in detail.

2. Software configuration:
FIG. 6 is a flowchart showing the connection / disconnection switching process. This connection / disconnection switching process is executed by the control unit 70 of the document camera 50 and is repeatedly executed every predetermined time.

  When the process is started, the control unit 70 captures a detection signal from the arm opening / closing detection unit 75 (step S1010), and based on the detection signal, whether the arm 56 is in a shooting state or a non-shooting state. Is determined (step S1020). When it is determined that the arm 56 is in the non-photographing state, the control unit 70 detects whether or not the detection of the non-photographing state is the first, so that it is the timing when the arm is switched to the non-photographing state. Is determined (step S1030). When the arm 56 is switched from the photographing state to the non-photographing state, or when the USB cable 90 is connected while the arm 56 is not in the photographing state, the control unit 70 controls the circuit control unit 77 to control the USB cable 90. By disconnecting the pull-up resistor 77a connected to the data line D + from the power line 77c, the data line is disconnected between the document camera 50 and the projector 10 (disconnection processing: step S1040). After execution of step S1040, the process returns to “return”, and the connection / disconnection switching process is temporarily ended. On the other hand, when it is determined in step S1030 that it is not the timing when the arm 56 is switched to the non-photographing state, the process returns to “RETURN” and the connection / disconnection switching process is temporarily ended.

  On the other hand, when it is determined in step S1020 that the arm 56 is in the shooting state, the control unit 70 detects whether or not the detection of the shooting state is the first, so that the arm is switched to the shooting state. It is determined whether or not there is (step S1045). When the arm 56 is switched from the non-shooting state to the shooting state, or when the arm 56 is in the shooting state and the USB cable 90 is connected, it is determined in step S1045 that it is the timing when the arm 56 is switched to the shooting state. The control unit 70 (i) controls the circuit control unit 77 to connect the pull-up resistor 77a connected to the data line D + of the USB cable 90 to the power supply line 77c. (Ii) After that, a connection time process to be described later is executed (connection process: step S1050). After executing step S1050, the process returns to “return” to end the connection / disconnection switching process.

  If it is determined in step S1030 that it is not the timing when the arm 56 is switched to the non-photographing state, and if it is determined in step S1045 that it is not the timing when the arm 56 is switched to the shooting state, the process returns to “return”. This connection / disconnection switching process is once terminated.

  FIG. 7 is a flowchart showing processing at the time of connection executed by the control units 20 and 70 of the projector 10 and the document camera 50. In the drawing, the right side is a connection time process for the control unit 20 of the projector 10, and the left side is a connection time process for the control unit 70 of the document camera 50. Each connection process is started when a data line between the projector 10 and the document camera 50 is logically connected. That is, in the document camera 50, the connection process is executed in step S1050 of the connection / disconnection switching process (FIG. 6).

  When the process is started, each control unit (hereinafter also referred to as “projector control unit 20” or “document camera control unit 70”) 20 and 70 is first connected by USB between the projector 10 and the document camera 50. Processing for detecting a connection is performed (steps S110 and S210). This processing detects that the USB interface unit 26 of the projector 10 and the USB interface unit 76 of the document camera 50 are connected using the USB cable 90. In addition, each control part 20 and 70 waits for a connection detection to be performed, when a connection detection is not made.

  When the USB connection is detected, the control units 20 and 70 then perform configuration settings (steps S120 and S220). Specifically, the projector control unit 20 requests a descriptor from the document camera 50, and the document camera control unit 70 returns the descriptor to the projector 10 in response to the request. The projector control unit 20 acquires a descriptor sent from the document camera 50.

  The descriptor includes a configuration descriptor indicating that the document camera 50 operates as a device conforming to the USB standard. The configuration descriptor includes a list of functions that can be controlled by the projector 10 using the functions of the document camera 50, supported frame resolutions, supported frame formats (MJPEG / YUV), and the like.

  The configuration settings in steps S120 and S220 are actually performed in the enumeration process that is started after the USB connection is detected. That is, in practice, enumeration processing according to the USB standard is performed, but only the configuration settings, which are the main components, are described in the flowchart shown in the figure.

  When the configuration can be set, the projector control unit 20 loads the USB video class driver (step S130). Specifically, the USB video device class is detected from the device class information included in the descriptor, and the USB video class driver is loaded. The following processing is executed using the loaded USB video class driver as necessary.

  After execution of step S130, the projector control unit 20 determines whether or not the projector 10 is in a standby state (step S140). When the projector 10 is in a standby state, the projector 10 is turned on (step S150). . After execution of step S150, the process proceeds to step S180. If it is determined in step S140 that the device is not in a standby state, that is, in a power-on state, the process proceeds to step S180.

  In step S <b> 180, the projector control unit 20 performs a process of acquiring control parameters for the document camera 50. This process requests various control parameters from the document camera 50, and acquires various control parameters sent from the document camera 50 in response to the request. The control parameter is, for example, a setting range value (Min / Max) of a function (zoom, contrast adjustment, brightness adjustment, etc.) of the document camera 50 that can be controlled from the projector 10, a current setting value of the above function, or the like. These control parameters are used as needed by processing (not shown) on the projector 10 side.

  When the document camera control unit 70 receives a control parameter request from the projector control unit 20, the document camera control unit 70 transmits the control parameter to the projector 10 in response to the request (step S230).

  After executing step S180, the projector control unit 20 performs stream negotiation processing (step S190). The stream negotiation here is a process of setting the projector 10 based on the configuration descriptor acquired in step S120. The document camera control unit 70 similarly performs stream negotiation processing while exchanging with the projector control unit 20 (step S240). More specifically, the processing in steps S190 and S240 determines conditions for sending a stream (image data) such as frame resolution, frame format, interval, and bandwidth.

  After executing step S240, the document camera control unit 70 transmits the stream under the conditions determined in step S240 (step S250). After executing step S190, the projector control unit 20 requests the document camera 50 to transmit a stream, receives the stream transmitted in step S250, and performs image processing by the image processing unit 32 on the stream. Thus, display image data is generated and projection of the display image data is executed (step S192). Then, the projector control unit 20 ends this connection process. After executing step S250, the document camera control unit 70 ends the connection time process.

  In the present embodiment, the camera head 58 (photoelectric conversion element provided in the camera head 58 in a narrow sense), the arm 56, and the arm open / close detection unit 75 are the “imaging unit” and “movable holding unit” which are constituent elements of the present invention. ”And“ state detection unit ”. The connection / disconnection switching process executed by the control unit 70, the circuit control unit 77, and the control unit 70 corresponds to a “control unit” that is a component of the present invention.

3. Action, effect:
In the projector system 100 of the present embodiment configured as described above, the operator can switch the arm 56 between the photographing state and the non-photographing state by moving the arm 56 in the document camera 50. Whether the arm 56 is in the state is detected by the arm opening / closing detection unit 75, and when it is determined that the arm 56 is not in the photographing state, the circuit control unit 77 is operated by the control unit 70, and the document camera 50, the projector 10, The data line between is logically disconnected. For this reason, since the image signal output from the document camera 50 is not transmitted to the projector 10 when the arm 56 is folded and in a non-photographing state, an image not desired by the user is displayed. This can be prevented. Further, even when the arm 56 is folded and the state where the document camera 50 and the projector 10 are connected with the USB cable 90 is continued, useless power is not consumed.

  Further, in the projector system 100 of the present embodiment, after the data line between the document camera 50 and the projector 10 is logically connected, communication via the USB interface is immediately established, and the projector 10 is in a standby state. Sometimes, the projector 10 is automatically switched on. Therefore, it is excellent in workability.

4). Variations:
The present invention is not limited to the above-described embodiments and modifications thereof, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

  (1) In the above-described embodiment, the arm 56 of the document camera 50 can be folded at the connecting portion with the arm mounting portion 62 and the length can be expanded and contracted. The configuration is not limited to any configuration, and any configuration can be used as long as the arm can be folded from a shooting state in which the subject can be shot. For example, the arm can be configured as a so-called two-joint arm that can be rotated at two locations, that is, an attachment portion to the base and a central portion in the longitudinal direction.

  (2) In the above embodiment, the circuit control unit 77 is provided on the document camera 50 side. However, instead of this, the circuit control unit 77 may be provided on the projector 10 side. In other words, the detection result of the arm opening / closing detection unit may be transmitted to the projector 10 side, and the document camera 50 and the projector 10 may be connected / disconnected based on the transmission result on the projector 10 side.

  (3) In the above embodiment, the circuit control unit 77 is configured to connect / disconnect between the document camera 50 and the projector 10 by connecting / disconnecting the pull-up resistor connected to the data line of the USB cable. However, instead of this, the document camera 50 and the projector 10 may be connected / disconnected by other methods such as providing an analog switch on the data line to electrically connect / disconnect the data line.

  (4) In the above embodiment, the document camera 50 is used as the image input device, but instead of this, another image input device including an imaging unit, for example, a web camera, a digital still camera, a video camera, or the like is used. It is good also as a structure.

  (5) In the above-described embodiment, the projector 10 that projects an image on the external screen SC is used as the image display device. Instead, a screen and a projector that projects an image on the back side of the screen are used. It is good also as a structure using the projection television provided. Furthermore, it is not limited to a projector, and can be replaced with various image display devices such as a display device.

  (6) In the above embodiment, the document camera 50 as the image input device and the projector 10 as the image display device are connected by the USB cable 90. Instead of this, another cable such as a LAN cable is used. It is good also as connection by. Further, a configuration in which the image input device and the image display device are wirelessly connected by a wireless USB or the like may be employed.

  (7) In the above embodiment, in the connection process executed by the projector, when the projector 10 is in the standby state, the projector 10 is automatically switched to the on state. A configuration may be added in which it is confirmed whether or not the source (current input source) is a document camera, and the input source is switched to the document camera in cases other than the document camera. According to this configuration, when the current source is something other than a document camera such as a video tape recorder or a DVD player, it can be automatically switched to the document camera, which is superior in workability.

  (8) In the above embodiment, a part of the configuration realized by hardware may be replaced with software. Conversely, a part of the configuration realized by software may be replaced by hardware. It may be.

DESCRIPTION OF SYMBOLS 10 ... Projector 20 ... Control part 22 ... Memory | storage part 24 ... Operation part 26 ... USB interface part 28 ... Input interface part 30 ... Input source switching part 32 ... Image processing part 34 ... Projection part 50 ... Document camera 52 ... Base 54 ... Mounting surface 56 ... Arm 56a ... Lower arm 56b ... Upper arm 58 ... Camera head 60 ... Operation panel 70 ... Control unit 72 ... Storage unit 74 ... Operation unit 75 ... Arm open / close detection unit 76 ... USB interface unit 77 ... Circuit control unit 77a ... pull-up resistor 77b ... switch element 77c ... power supply line 77d ... signal line 78 ... illumination unit 80 ... illumination control unit 82 ... imaging unit 84 ... image processing unit 86 ... resolution conversion unit 100 ... projector system 341 ... illumination optical system 342 ... Light source 343 ... Color separation optical system 344R ... Light modulation for red light Child 344 g ... green light modulator 344B ... blue Hikari Mitsumochi modulation element 345 ... relay optical system 346 ... projection lens 347 ... combining system T ... subject SC ... screen.

Claims (8)

In an image display system for connecting an image input device and an image display device and displaying an image obtained by the image input device on the image display device,
The image input device includes:
An imaging unit for photographing a subject;
While holding the imaging unit, a movable holding unit capable of selectively taking a shooting state where the subject can be shot and a non-shooting state where the subject is not shot,
A state detection unit for detecting whether the movable holding unit is in the shooting state or the non-shooting state;
With
When the state detection unit determines that the movable holding unit is in the non-photographing state, logically disconnects a transmission path for exchanging data between the image input device and the image display device; An image display system comprising: a control unit that logically connects the transmission paths when the state detection unit determines that the movable holding unit is in the shooting state. The image display system according to claim 1,
The image input device and the image display device are connected via a USB cable,
The image input device includes the control unit,
The controller is
An image display system comprising: a circuit control unit that realizes the disconnected state by disconnecting a pull-up resistor connected to a data line of the USB cable and realizes the connected state by connecting the pull-up resistor. The image display system according to claim 1 or 2,
The controller is
Establishing USB communication that establishes communication with the image display apparatus using the USB standard mutatis mutandis after it is determined that it is time to switch the movable holding unit from the non-photographing state to the photographing state. An image display system comprising a unit. The image display system according to claim 3,
The USB communication establishment unit
A standby state determination unit for determining whether or not the image display device is in a standby state;
An image display system comprising: an activation unit that switches the image display device from a standby state to an on state when a standby state is determined by the standby state determination unit. The image display system according to any one of claims 1 to 4,
The image input device is a document camera;
The image display device is an image display system that is a projector. In an image input device for inputting an image and displaying the image on an image display device,
An imaging unit for photographing a subject;
While holding the imaging unit, a movable holding unit capable of selectively taking a shooting state where the subject can be shot and a non-shooting state where the subject is not shot,
A state detection unit for detecting whether the movable holding unit is in the shooting state or the non-shooting state;
When the state detection unit determines that the movable holding unit is in the non-photographing state, the transmission path for exchanging data with the image display device is in a disconnected state in which the transmission path is logically disconnected. A control unit configured to establish a connection state in which the transmission path is logically connected to the image display device when the state detection unit determines that the movable holding unit is in the shooting state. An image input device. An image input device control method for inputting an image and causing the image display device to display the image,
Provide an imaging unit to shoot the subject,
A movable holding unit that holds the imaging unit and can selectively take a shooting state in which the subject can be shot and a non-shooting state in which the subject is not shot;
Determining whether the movable holding portion is in the shooting state or the non-shooting state;
When it is determined that the movable holding unit is in the non-photographing state, a transmission path for exchanging data between the image input device and the image display device is in a disconnected state in which the transmission path is logically disconnected, When it is determined that the movable holding unit is in the shooting state, the transmission path is logically connected.
Control method. The control method according to claim 7, comprising:
Providing a connection means for connecting the image input device and the image display device with a USB cable;
When determined to be in the non-photographing state, the disconnection state is realized by disconnecting a pull-up resistor connected to the data line of the USB cable,
When it is determined that the camera is in the shooting state, the connection state is realized by connecting the pull-up resistor.
Control method.

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