JP5707711B2 - Document camera, document camera control method, and image display system - Google Patents

Description

  The present invention relates to an image signal supply device, an image display device connected to the image signal supply device, and an image display system including the image signal supply device and the image display device.

  In recent years, connecting a document camera to a projector and projecting an image captured by the document camera with a projector has been effectively used in presentations and the like. As one of such image display systems, a configuration has been proposed in which the color and brightness of an image projected by a projector can be controlled from the document camera side (Patent Document 1).

JP 2003-101818 A

  However, even in the above conventional technique, the user's operability is not excellent for the following reason. The projector usually has multiple input interfaces, and if the document camera is connected when displaying images by connecting to an input device other than the document camera, the image of the document camera should be displayed immediately. I can't. Therefore, the user needs to switch the input source to the document camera by operating a projector remote controller or a panel switch provided in the projector. However, at that time, the user needs to move to a place where the projector or projector remote control is placed, and the operability is poor.

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to improve operability by facilitating switching of the input source of a projector.

  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 signal supply apparatus that is connected to an image display apparatus including an input source switching unit and outputs an image signal that can be one of input sources to the image display apparatus, communication is performed with the image display apparatus. An image signal supply comprising: a communication unit for performing a switching operation; and a switching command output unit for outputting a command signal for switching the input source to the image display device via the communication unit. apparatus.

  In the image signal supply device described in Application Example 1, a command signal for switching the input source is output to the image display device via the communication unit by the switch command output unit, so that the image signal supply device side The input source of the image displayed by the image display device can be switched. Therefore, the image signal supply device described in Application Example 1 is highly convenient because the user does not have to move to the place where the image display device or the remote controller for the image display device is placed.

  Application Example 2 The image signal supply apparatus according to the application example, the image signal supply apparatus including an imaging unit that images a subject.

  The image signal supply device described in Application Example 2 can be used as a camera that captures an image of a subject.

  Application Example 3 The image signal supply apparatus according to the application example described above, further including a switch that receives a predetermined operation, wherein the switching command output unit is configured to execute the command based on a predetermined operation performed on the switch. An image signal supply device configured to output a signal.

  In the image signal supply device described in Application Example 3, a command signal for switching the input source can be output to the image display device only by the user operating the switch. Therefore, it is more excellent in operability.

  [Application Example 4] The image signal supply device according to Application Example 2, wherein the foldable arm is configured to hold the imaging unit, and the arm detects that the arm is in a deployed state. An image signal supply device configured to output the command signal when the arm deployment detection unit detects that the arm is deployed. .

  In the image signal supply device according to Application Example 4, the user can perform input source switching only by performing an operation of expanding the arm that holds the imaging unit when performing imaging using the image signal supply device. The command signal can be output to the image display device. Therefore, it is more excellent in operability.

  Application Example 5 The image signal supply apparatus according to the application example, in which the communication unit is configured to perform communication conforming to a USB standard.

  In the image signal supply device described in Application Example 5, communication can be performed using a USB that is a general-purpose interface.

  Application Example 6 An image display device connected to an image signal supply device, a communication unit for communicating with the image signal supply device, and an input source switching unit for switching an input source of an image to be displayed And a switching control unit that operates the input source switching unit when receiving a command signal for switching the input source from the image signal supply device via the communication unit. .

  Application Example 7 An image display system including an image display device and an image signal supply device connected to the image display device, wherein the image display device switches an input source of an image to be displayed. The image signal supply device includes a communication unit for performing communication with the image display device, and a command signal for executing switching of the input source via the communication unit. An image display system comprising: a switching command output unit that outputs to a device.

  In the image display device described in Application Example 6 and the image display system described in Application Example 7, the input source of an image to be displayed can be switched from the image signal supply device side. Therefore, in the image display device according to Application Example 6 and the image display system according to Application Example 7, in order for the user of the image signal supply device to switch the input source of the image display device, the image display device and its image display are displayed. Since it is not necessary to move to the place where the device remote control is placed, the operability is excellent.

  The present invention can be realized in various modes. For example, a method for realizing each part of the image signal supply apparatus or the image display apparatus, a computer program for realizing each part, The present invention can be realized in the form of a recording medium recording a computer program, the computer program, or the like.

  Application Example 8 An image display system including an image display device and an image signal supply device connected to the image display device, the image display device including an input source switching unit that switches an input source, The image signal supply device outputs a communication unit for performing communication with the image display device and a command signal for executing switching of the input source to the image display device via the communication unit. It is preferable to provide a switching command output unit.

  Application Example 9 The image signal supply device control method described in this application example is connected to an image display device including an input source switching unit that switches an input source, and an image signal that can be one of the input sources is displayed in the image. A method for controlling an image signal supply device to be input to a device, comprising: establishing a connection with the image display device; and sending a command signal for switching the input source via the communication unit. And a step of outputting to a display device.

  Application Example 10 It is preferable that the image signal supply apparatus control method according to the application example further includes a step of preparing an imaging unit that images a subject.

  Application Example 11 In the control method of the image signal supply device according to the application example described above, based on the step of preparing a switch that receives a predetermined operation, and the predetermined operation received through the switch, Preferably, the method further includes a step of outputting a command signal.

  Application Example 12 In the control method of the image signal supply device according to the application example, a step of preparing a foldable arm configured to hold the imaging unit, and a state in which the arm is deployed A step of preparing an arm deployment detection unit for detecting the presence of the arm, and a step of outputting the command signal when the arm deployment detection unit detects that the arm is deployed. It is preferable.

1 is an explanatory diagram showing a schematic configuration of a projector system 100 as an embodiment of the present invention. 2 is an explanatory diagram showing an internal configuration of a projector 10 and a document camera 50. FIG. 4 is a flowchart showing a switching command issue process executed by the control unit 70 of the document camera 50. 4 is a flowchart illustrating a switching execution process executed by the control unit 20 of the projector 10. It is explanatory drawing which shows an example of the mode of the input source switching implement | achieved by the process of repetition of step S230 thru | or S260. It is explanatory drawing which shows an example of input source list screen SS. It is explanatory drawing which shows an example of the screen ST during input source detection. 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, four image input devices connected to the projector 10, that is, a document camera 50, a personal computer 90, a video tape recorder (VTR) 91, and a DVD. And a player 92. These image input devices provide an image input source to the projector 10. Here, the image may be either a still image or a moving image (that is, video). The document camera 50 acquires a video. The projector 10 selects a desired one from these input sources, and displays (projects) an image on the screen SC based on the selected input source.

  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, on which a subject T such as paper on which characters or pictures are drawn, or a three-dimensional object is placed. The arm 56 holds the camera head 58. The camera head 58 includes a lens, an LED, a photoelectric conversion element such as a CCD, and the like, and images the subject T placed on the placement surface 54. 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.

  The arm 56 may be one that extends upward from the base 52 and is fixed, or may be configured to be foldable toward the base 52. By making it foldable, the document camera 50 can be put together in a compact manner. The subject can be imaged by unfolding the folded arm 56.

  According to the document camera 50 having such a configuration, the subject T placed on the placement surface 54 is imaged, and an image signal indicating an image obtained by the imaging is output to the projector 10. The projector 10 and the document camera 50 are connected by USB via a USB cable 62.

  FIG. 2 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 between the control unit 20 and each unit (storage unit 22 to image processing unit 32) excluding the projection unit 34.

  The control unit 20 is configured by a CPU or the like, operates according to a computer program stored in the storage unit 22, and controls each unit (storage unit 22 to image processing unit 32). The storage unit 22 stores image data and various computer programs. As various computer programs, a well-known USB module, a USB class driver, an image display program, a program for switching execution processing 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 an interface for exchanging control data, image data, and the like with an external device in accordance with the USB (Universal Serial Bus) standard. In this embodiment, the document camera 50 is connected to the USB interface unit 26.

  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. A personal computer 90 is connected to the RGB interface, a VTR 91 is connected to the video interface, and a DVD player 92 is connected to the S-video interface.

  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. Note that the projector 10 of this 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.

  As shown in FIG. 2, the document camera 50 includes a control unit 70, a storage unit 72, an operation unit 74, a USB interface unit (USB I / F unit) 76, an illumination unit 78, an illumination control unit 80, an imaging unit 82, and an image. A processing unit 84 and a resolution conversion unit 86 are provided. 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, a DSP, and 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 switching command issue processing 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 operation unit 74 includes an input source switching button SB. The input source switching button SB is provided on the operation panel 60 shown in FIG. 1, and the function thereof will be described in detail later.

  The USB interface unit 76 is an interface 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. The USB interface unit 76 corresponds to a “communication unit” that is a component of the present invention.

  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 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, when the document camera 50 and the projector 10 are connected using the USB cable 62, the projector 10 establishes a connection with the USB I / F unit 76 of the document camera 50 via the USB I / F unit 26.

  Subsequently, on the document camera 50 side, when the control unit 70 receives an operation of the operation unit 74, the control unit 70 controls the illumination control unit 80, the image processing unit 84, and the resolution conversion unit 86, so that the placement surface 54 (FIG. The subject T placed in 1) is imaged, and the image signal 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).

  As described above, the projector 10 includes various input sources in addition to the document camera 50. When receiving a user operation on an input source switching button (not shown) provided in the operation unit 24, the control unit 20 of the projector 10 activates the input source switching unit 30 and the USB interface unit 26. The input source of the image displayed on the projector 10 is switched by selecting one interface from the interfaces provided in the input interface unit 28.

  Further, in this embodiment, the operation unit 74 on the document camera 50 side is also provided with the input source switching button SB as described above. Similarly, when the input source switching button SB is operated by the user, the input source of the image displayed on the projector 10 is switched. Hereinafter, operations of the document camera 50 and the projector 10 when the input source switching button SB is pressed will be described in detail.

2. Software configuration:
FIG. 3 is a flowchart showing a switching command issue process executed by the control unit 70 of the document camera 50. This switching command issuance process is repeatedly executed every predetermined time. First, when the document camera 50 and the projector 10 are electrically connected by the USB cable 62, the projector 10 detects the document camera 50 and requests transmission of a descriptor. The document camera 50 responds to this request and transmits descriptor information to the projector 10, thereby establishing a USB connection between the document camera 50 and the projector 10 (step S100). In this embodiment, the projector 10 is a “host” and the document camera 50 is a “device”. The definitions of “host” and “device” are based on the USB protocol. Subsequently, the control unit 70 of the document camera 50 determines whether or not the input source switching button SB provided on the operation panel 60 has been pressed (step S110). Here, when it is determined that the input source switching button SB has been pressed, the control unit 70 generates a command signal (hereinafter referred to as an “input source switching command signal”) for switching the input source. The data is transmitted to the projector 10 via the USB I / F unit 76 (step S120). Specifically, the document camera 50 is configured to transmit button IDs for various buttons and button push or button release events to the projector 10 as input source switching command signals.

  The transmission of the input source switching command signal from the USB I / F unit 76 is actually performed by “control transfer” or “interrupt transfer” in USB communication control. That is, data indicating that the input source switching button SB has been pressed is temporarily stored in the storage unit 72, and the above data is fetched from the projector 10 side via the USB I / F unit 26, whereby an input source switching command is issued. Signal transmission is realized. In other words, data indicating that the input source switching button SB has been pressed is transmitted as an input source switching command signal.

  The control unit 70 and the process of step S120 executed by the control unit 70 correspond to a “switching command output unit” that is a component of the present invention. After the execution of step S120, the process returns to “return” to end the switching command issue process once. On the other hand, if it is determined in step S110 that the input source switching button SB has not been pressed, the process immediately returns to “RETURN” and this switching command issuance process is temporarily terminated.

  FIG. 4 is a flowchart showing a switching execution process executed by the control unit 20 of the projector 10. This switching execution process is repeatedly executed every predetermined time. First, the projector 10 that is the “host” establishes a connection with the document camera 50 that is the “device” (step S200). Subsequently, the control unit 20 of the projector 10 performs a process of receiving an input source switching command signal sent from the document camera 50 (step S210). If the input source switching command signal is not sent from the document camera 50 and reception fails, a negative determination is made in the subsequent step S220, that is, it is determined that there is no input source switching command signal, and “return” is set. The switching execution process is temporarily terminated.

  On the other hand, if the input source switching command signal is successfully received and it is determined in step S220 that there is an input source switching command signal, the control unit 20 operates the input source switching unit 30 and is displayed. An input source switching process for switching the input source to the next one is executed (step S230).

  In the projector 10, as described above, a plurality of input sources can be selected, and the ranks are given in advance to these sources. For example, the order is given in the order of “computer” → “video” → “S-video” → “camera”. Here, “computer” is the personal computer 90, “video” is the VTR 91, “S-video” is the DVD player 92, and “camera” is the document camera 50. The input source switching unit 30 performs a process of switching the input source to the next one.

  Thereafter, the control unit 20 determines whether an image signal is input from the input source switched in step S230 (step S240). If it is determined that an image signal is input, the control unit 20 operates the image processing unit 32 to display an image based on the input source (step S250).

  On the other hand, if it is determined in step S240 that there is no input of an image signal from the input source, the process proceeds to step S260, and an input search for all input sources other than the currently displayed input source is performed. It is determined whether or not it has been completed. If it is determined that the input search for all the input sources has not been completed, the process returns to step S230 to switch the input source to the next one.

  FIG. 5 is an explanatory diagram showing an example of the state of input source switching realized by the repeated processing of steps S230 to S260. When an image based on the input source of “Computer” is displayed as shown in (a) in the figure, when the input source switching button SB is pressed as shown in (b), (c) As shown in (d), the input source shifts to the next “video” (step S230), but if no image signal is input from the VTR 91 that is “video” (step S240: NO), as shown in (d). The input source further proceeds to the next “S-video” (step S230). Here, when an image signal is input from the DVD player 92 which is “S-video” (step S240: YES), an image based on the DVD player 92 is displayed (step S250).

  As shown in FIG. 5E, when the input source switching button SB is pressed again, the input source shifts to the next “camera”, and the image signal is transferred from the document camera 50 which is the “camera”. When there is an input, an image based on the document camera 50 is displayed as shown in (f) (step S250). As shown in (g), when the input source switching button SB is pressed again, the input source shifts to “computer” having the first rank, and the personal computer 90 being “computer”. When an image signal is input from, an image based on the personal computer 90 is displayed (step S250), as shown in (a).

  Returning to FIG. 4, if it is determined in step S260 that the input search for all input sources other than the currently displayed input source has been completed, the control unit 20 displays the input source list screen. A display process is performed (step S270). If it is determined that the input search for all the input sources has been completed, it means that only the currently displayed image signal has been input to the projector 10, and therefore the input source list screen is displayed on the screen SC. Then, the user is prompted to perform an operation described later.

  FIG. 6 is an explanatory diagram showing an example of the input source list screen SS. As shown in the drawing, on the input source list screen SS, all the source names of the image input devices connected to the projector 10 are displayed as a list. Each source name displays whether or not an image signal is input. Each source name can be selected by operating the document camera 50 by the user. That is, the user operates the operation panel 60 to select a desired one from a plurality of source names. This selection command is sent from the document camera 50 to the projector 10.

  Returning to FIG. 4, in step S280 following step S270, the control unit 20 receives a selection command from the document camera 50 and displays an image based on the selected input source. As a result, the input source having the source name selected from the input source list screen SS by the user is displayed on the screen SC. In particular, even when the selected input source is the document camera 50, acquisition of image data captured by the document camera 50 is started, and the image data of the document camera 50 is displayed. When there is no selection command from the document camera 50 for a certain period of time, the display of the input source list screen SS is terminated (not displayed).

  After execution of step S280 or after execution of step S250, the process returns to “Return”, and the switching execution process is temporarily terminated.

3. Action, effect:
In the projector system 100 of the present embodiment configured as described above, the input source displayed on the projector 10 can be switched by pressing the input source switching button SB of the document camera 50. For this reason, the user can switch the displayed input source without moving to the place where the projector or projector remote control is placed, especially the input source switching button as many times as necessary. The input source can be switched to the document camera 50 by pressing SB. Therefore, the user's operability can be improved.

  In this embodiment, every time an operation of pressing the input source switching button SB of the document camera 50 is performed, the displayed input source is switched one by one, thereby sequentially switching the screen of the switched input source. It can be visually recognized by the user. For this reason, the user does not mistakenly switch the input source. In addition, the user has a secondary effect that the document camera 50 can be switched to an input source other than the document camera.

  Furthermore, in this embodiment, even when the input source switching button SB is pressed, the input source to which no image signal is input is skipped, so that the target image can be displayed quickly. Further, even when only the currently projected image signal is input or when no image signal is input, the input source can be selected by using the input source list screen.

4). Variation:
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 embodiment, the input source list screen is displayed when only the currently projected (displayed) image signal is input by pressing the input source switching button SB. Alternatively, the input source list screen may be displayed immediately when the input source switching button SB is pressed regardless of whether or not an image signal is input. This makes it possible to quickly select an input source to be displayed.

  (2) In the above embodiment, by operating the input source switching button SB, it is possible to sequentially switch the displayed input source to other than the document camera, but instead, the input source switching button SB When is operated, the input source may be directly switched to the document camera. That is, when the input source switching command signal is received from the document camera, the projector searches for the document camera as an input source to be displayed and displays the image data from the document camera. During the search for the document camera, it is preferable that the projector displays the input source detecting screen ST shown in FIG. 7 on the screen.

  (3) In the above embodiment, the document camera 50 outputs the input source switching command signal when the input source switching button SB is operated by the user, but instead, the document camera 50 outputs the input source switching command signal. The arm 56 may be in a deployed state. That is, the document camera 50 is provided with a switch as an arm unfolding detection unit that detects that the arm 56 is unfolded, and outputs an input source switching command signal when the switch detects the unfolding. It is good. According to this configuration, the user can output an input source switching command signal to the projector 10 only by expanding the arm 56 that holds the camera head 58 when taking an image using the document camera 50. it can. Therefore, it is more excellent in operability. The document camera 50 does not need to output the input source switching command signal in the above two cases, but may be when another switch is operated by the user. Further, the switch is not necessarily limited to a switch that is turned on in response to an operation by the user, and may be configured to output an input source switching command signal when a predetermined condition is satisfied.

  (4) In the above embodiment, the projector 10 and the document camera 50 are connected by USB. However, instead of this, another wired connection such as a LAN may be used. Moreover, it does not necessarily need to be wired, and may be based on wireless connection such as USB or LAN.

  (5) In the above embodiment, the document camera 50 is used as the image signal supply device. However, instead of this, another image signal supply device including an imaging unit, for example, a web camera, a digital still camera, a video camera, etc. It is good also as a structure using.

  (6) In the above embodiment, the projector 10 in which the light modulation element 344 is configured by a transmissive liquid crystal panel is illustrated as an image display device. However, the light modulation element 344 is a reflection type liquid crystal panel or a micromirror device. It can also be configured. In the above embodiment, the invention has been described using the projector 10 that employs the three light modulation elements 344. However, the number of the light modulation elements 344 is not limited to three. For example, the illumination optical system 341 may be provided with a rotating color wheel, and one light modulation element 344 may be used to generate image light of each color in a time division manner. Furthermore, a configuration using four or more light modulation elements 344 is also possible.

  (7) 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, the image display device is not limited to a projector, and can be replaced with various image display devices such as various direct-view flat panel display devices.

  (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 58 ... Camera head 60 ... Operation panel 70 ... Control unit 72 ... Storage unit 74 ... Operation unit 76 ... USB interface unit 78 ... Illumination unit 80 ... Illumination control unit 82 ... Imaging unit 84 ... Image processing unit 86 ... Resolution converter 90 ... Personal computer 91 ... Video tape recorder 92 ... DVD player 100 ... Projector system 341 ... Illumination optical system 342 ... Light source 343 ... Color separation optical system 344R ... Red light modulation element 344G ... Green light modulation element 344B ... Blue light modulation element 345 ... Relay optical system 346: Projection lens 347: Composite optical system T ... Subject SB ... Input source switching button SC ... Screen SS ... Input source list screen.

Claims (4)

In a document camera that is connected to an image display device and outputs an image signal that can be one of input sources to the image display device,
A communication unit for communicating with the image display device;
An imaging unit for imaging a subject;
An operation unit provided integrally with the imaging unit;
A first command output unit that outputs a first command signal for displaying a list of the input sources to the image display device via the communication unit when the operation unit receives a predetermined operation; ,
Based on the selection operation when the operation unit receives a selection operation for selecting a desired input source from the list of input sources displayed in response to the first command signal by the image display device A second command output unit that outputs a second command signal to the image display device via the communication unit and causes the image display device to display an image based on the selected input source. A document camera . The document camera according to claim 1 ,
The communication unit is a document camera configured to perform communication conforming to a USB standard. An image display system comprising an image display device and a document camera connected to the image display device,
The document camera
A communication unit for communicating with the image display device;
An imaging unit for imaging a subject;
An operation unit provided integrally with the imaging unit;
A first command output unit that outputs a first command signal for displaying a list of the input sources to the image display device via the communication unit when the operation unit receives a predetermined operation; ,
Based on the selection operation when the operation unit receives a selection operation for selecting a desired input source from the list of input sources displayed in response to the first command signal by the image display device A second command output unit that outputs a second command signal to the image display device via the communication unit and causes the image display device to display an image based on the selected input source. Image display system. A document camera control method for outputting to the image display device an image signal that is connected to the image display device and can be one of input sources,
A first command signal for displaying a list of the input sources is output to the image display device when an operation unit provided integrally with an imaging unit that images a subject receives a predetermined operation. Command output step,
Based on the selection operation when the operation unit receives a selection operation for selecting a desired input source from the list of input sources displayed in response to the first command signal by the image display device the second command signal is output to the image display device, control method for a document camera, characterized in that it comprises a second command output step of displaying an image based on the input source selected in said image display device .

Images