Document camera and display system

Abstract

To improve user convenience.SOLUTION: A document camera comprises: an imaging section 190 which generates a picked-up image PT of a subject TG; a connector of a USB interface 161 to which a projector 200 for displaying the picked-up image PT is connected via a USB cable 109; a communication dongle 300 for wirelessly communicating with the projector 200; and a first processor 121. The first processor 121 determines whether or not the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109 and, in a case where it is determined that the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109, transmits a request signal CM requesting to the projector 200 first information J1 which is information required for establishing the radio communication with the projector 200, to the projector 200 via the USB cable 109.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a document camera and a display system. [Background technology]

[0002] Patent Document 1 discloses a wireless document system including a document device and an image display device. The document device includes a document input means for capturing an image of a subject and outputting an image signal of the subject, and a first wireless communication means for transmitting the image signal output from the document input means. The image display device includes a second wireless communication means for receiving the image signal transmitted from the document device, and an output means for outputting the image signal received by the second wireless communication means. In other words, the document device is wirelessly connected to an image display device such as a liquid crystal projector so as to be able to communicate with each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-234146 A Summary of the Invention [Problem to be solved by the invention]

[0004] When connecting a document display device to a video display device so that they can communicate wirelessly, such as the wireless document display system described in Patent Document 1, the user must obtain in advance the information necessary to establish wireless communication with the video display device, such as the physical address and name of the video display device. [Means for solving the problem]

[0005] One aspect of the invention that solves the above problem is a document camera comprising: a camera that captures an image of a subject and generates an captured image of the subject; a connection terminal to which a display device that displays the captured image is connected via a communication cable; a communication interface that communicates wirelessly with the display device; and at least one processor, wherein the at least one processor determines whether the display device is connected to the connection terminal via the communication cable, and when it is determined that the display device is connected to the connection terminal via the communication cable, transmits a request signal to the display device via the communication cable, requesting first information, which is information necessary to establish wireless communication with the display device.

[0006] Another aspect that solves the above problem is a display system comprising a document camera that captures an image of a subject and generates an image of the subject, and a display device that communicates wirelessly with the document camera and displays the captured image, wherein the document camera is configured to be connectable to the display device via a communication cable, and when the display device is connected via the communication cable, the document camera transmits a request signal to the display device via the communication cable requesting first information necessary to establish wireless communication with the display device. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a display system. [Diagram 2] FIG. 1 illustrates an example of the configuration of a projector. [Diagram 3] FIG. 1 is a diagram showing an example of the configuration of a document camera. [Figure 4] 6 is a flowchart showing an example of processing by a first control unit of the document camera. [Diagram 5] 10 is a flowchart showing an example of processing by a second control unit of the projector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment will be described with reference to the drawings.

[0009] [1. Display system configuration] FIG. 1 is a diagram showing an example of the configuration of a display system 1. As shown in FIG. The display system 1 includes a document camera 100 and a projector 200. The document camera 100 is wirelessly connected to the projector 200 so as to be able to communicate with the projector 200, and transmits image information to the projector 200.

[0010] The projector 200 receives image information from the document camera 100, and displays an image corresponding to the received image information on the screen SC. 1 illustrates an example of a floor-mounted installation in which projector 200 is placed on the floor in front of screen SC, but projector 200 may also be installed by suspending it from the ceiling. In this embodiment, an example is shown in which projector 200 projects onto flat screen SC, but the projection target is not limited to screen SC and may be a flat surface such as the wall surface of a building, or may be a curved or uneven surface. The projector 200 corresponds to an example of a "display device."

[0011] The document camera 100 is connected to the projector 200 so as to be capable of wired communication in accordance with the USB standard, for example, via a USB (Universal Serial Bus) cable 109. Also, as will be described with reference to FIG. 2, the document camera 100 is connected to the projector 200 so as to be capable of wireless communication in accordance with the Miracast (registered trademark) standard, for example, via a communication dongle 300. The USB cable 109 corresponds to an example of a "communication cable."

[0012] The document camera 100 includes a base 102, a mounting surface 104, an arm 106, a camera head 108, and an operation panel 110. The base 102 is a flat platform that supports the camera head 108, and the upper surface of the base 102 is the mounting surface 104 on which a subject TG is placed. The subject TG is, for example, a sheet of paper or the like on which characters or pictures are drawn, or a bound book, but as long as it can be placed on the placement surface 104, there is no restriction on the size or shape.

[0013] The arm 106 is erected on the base 102, and the camera head 108 is fixed to the tip of the arm 106. The arm 106 may be fixed to the base 102, or a connection portion connecting the arm 106 and the base 102 may include a rotation mechanism, and the arm 106 may be configured to be foldable toward the base 102 by this rotation mechanism. The camera head 108 is supported by the arm 106 and has an image capturing unit 190 built in that faces the placement surface 104. The image capturing unit 190 captures an image of the subject TG placed on the placement surface 104. The imaging section 190 will be further described with reference to FIG.

[0014] The operation panel 110 is provided, for example, on the upper surface of the base 102. The operation panel 110 includes a plurality of button switches that are operated by the user, and inputs operation commands to the document camera 100 by the user. The document camera 100 receives a user's operation via the operation panel 110, captures an image of a subject TG using the imaging unit 190 in response to the operation, generates a captured image PT, and outputs image information indicating the captured image PT to the projector 200.

[0015] Furthermore, the operation panel 110 includes, for example, an LED (Light Emitting Diode) 111. The LED 111 is configured to be able to light up and blink in, for example, red and green. The LED 111 corresponds to an example of an "announcement device."

[0016] [2. Projector configuration] FIG. 2 is a diagram showing an example of the configuration of the projector 200. As shown in FIG. The projector 200 includes a projection section 210 and a drive section 220 that drives the projection section 210. The projection section 210 forms an optical image and projects image light PL onto a screen SC. The projection unit 210 includes a light source unit 211, a light modulation device 212, and a projection optical system 213. The drive unit 220 includes a light source drive unit 221 and a light modulation device drive unit 222.

[0017] The light source unit 211 includes a lamp such as a halogen lamp, a xenon lamp, or an extra-high pressure mercury lamp, or a solid-state light source such as an LED (Light Emitting Diode) or a laser light source. The light source unit 211 may also include a reflector and an auxiliary reflector that guide the light emitted by the light source to the light modulation device 212. Furthermore, the light source unit 211 may also include a lens group for improving the optical characteristics of the projected light, a polarizing plate, or a dimming element that reduces the amount of light emitted by the light source on the path leading to the light modulation device 212. The light source driving unit 221 is connected to the second internal bus 207 , and turns on and off the light source of the light source unit 211 according to instructions from a second control unit 250 also connected to the second internal bus 207 .

[0018] The light modulation device 212 includes, for example, three liquid crystal panels 215 corresponding to the three primary colors of R, G, and B. R indicates red, G indicates green, and B indicates blue. That is, the light modulation device 212 includes a liquid crystal panel 215 corresponding to R light, a liquid crystal panel 215 corresponding to G light, and a liquid crystal panel 215 corresponding to B light. The light emitted by the light source unit 211 is separated into three color lights of RGB, and each color light is incident on a corresponding liquid crystal panel 215. Each of the three liquid crystal panels 215 is a transmissive liquid crystal panel, and generates image light PL by modulating the light passing through it. The image light PL modulated after passing through each liquid crystal panel 215 is combined by a combining optical system such as a cross dichroic prism, and is output to the projection optical system 213. In this embodiment, the light modulation device 212 is described as having a transmissive liquid crystal panel 215 as a light modulation element, but this embodiment is not limited to this. The light modulation element may be a reflective liquid crystal panel or a digital micromirror device.

[0019] The light modulation device 212 is driven by a light modulation device driving section 222. The light modulation device driving section 222 is connected to a second image processing section 245. Image data corresponding to each of the primary colors R, G, and B is input to the light modulation device driving unit 222 from the second image processing unit 245. The light modulation device driving unit 222 converts the input image data into a data signal suitable for the operation of the liquid crystal panel 215. The light modulation device driving unit 222 applies a voltage to each pixel of each liquid crystal panel 215 based on the converted data signal, and draws an image on each liquid crystal panel 215.

[0020] The projection optical system 213 includes lenses, mirrors, and the like that form an image of the incident image light PL on the screen SC. The projection optical system 213 may also include a zoom mechanism that enlarges or reduces the image projected onto the screen SC, a focus adjustment mechanism that adjusts the focus, and a lens shift mechanism that adjusts the projection direction of the image light PL.

[0021] The projector 200 further includes a second operation unit 231, a remote control receiver 233, an input interface 235, a second storage unit 237, a first communication interface 241, a second communication interface 242, a frame memory 243, a second image processing unit 245, and a second control unit 250. The input interface 235, the second storage unit 237, the first communication interface 241, the second communication interface 242, the second image processing unit 245, and the second control unit 250 are connected to each other via a second internal bus 207 so as to be able to communicate data with each other.

[0022] The second operation unit 231 includes various buttons and switches provided on the surface of the housing of the projector 200, generates operation signals corresponding to the operations of these buttons and switches, and outputs the operation signals to the input interface 235. The input interface 235 includes a circuit that outputs the operation signals input from the second operation unit 231 to the second control unit 250.

[0023] The remote control light receiving unit 233 receives an infrared signal transmitted from the remote control 5, and decodes the received infrared signal to generate an operation signal. The remote control light receiving unit 233 outputs the generated operation signal to the input interface 235. The input interface 235 includes a circuit that outputs the operation signal input from the remote control light receiving unit 233 to the second control unit 250.

[0024] The second storage unit 237 is, for example, a magnetic recording device such as a hard disk drive (HDD), or a storage device using a semiconductor storage element such as a flash memory or a solid state drive (SSD). The second storage unit 237 stores the program executed by the second control unit 250, the data processed by the second control unit 250, image data, and the like.

[0025] The first communication interface 241 is a communication interface that communicates with the document camera 100 in accordance with the USB standard. The first communication interface 241 includes a connector for connecting a USB cable and an interface circuit for processing signals transmitted through the connector. The first communication interface 241 is an interface board having a connector and an interface circuit, and is connected to a main board on which the second processor 253 of the second control unit 250 and the like are mounted. Alternatively, the connector and interface circuit that constitute the first communication interface 241 are mounted on the main board of the second control unit 250. The first communication interface 241 receives a request signal CM and the like from the document camera 100, and transmits first information J1 and the like to the document camera 100.

[0026] The second communication interface 242 is a communication interface that communicates with the document camera 100 in accordance with the Miracast (registered trademark) standard. The second communication interface 242 includes an antenna for transmitting and receiving Miracast (registered trademark) signals, and an interface circuit for processing signals transmitted and received by the antenna. The second communication interface 242 is an interface board having an antenna and an interface circuit, and is connected to a main board on which the second processor 253 of the second control unit 250 and the like are mounted. Alternatively, the antenna and interface circuit constituting the second communication interface 242 are mounted on the main board of the second control unit 250. The second communication interface 242 receives image information and the like from the document camera 100.

[0027] The second control unit 250 includes a second memory 251 and a second processor 253 . The second memory 251 is a storage device that non-volatilely stores programs and data executed by the second processor 253. The second memory 251 is configured by a semiconductor storage element such as a magnetic storage device or a flash ROM (Read Only Memory), or other types of non-volatile storage devices. The second memory 251 may also include a RAM (Random Access Memory) that configures a work area for the second processor 253. The second memory 251 stores data processed by the second control unit 250, a second control program executed by the second processor 253, and the like.

[0028] The second processor 253 may be configured as a single processor, or may be configured such that a plurality of processors function as the second processor 253. The second processor 253 executes a second control program to control each unit of the projector 200. For example, the second processor 253 outputs to the second image processing unit 245 an instruction to execute image processing corresponding to an operation accepted by the second operation unit 231 or the remote control 5, and parameters used in this image processing. The parameters include, for example, geometric correction parameters for correcting geometric distortion of an image projected on the screen SC. In addition, the second processor 253 controls the light source driving unit 221 to control the turning on and off of the light source unit 211, and adjusts the brightness of the light source unit 211.

[0029] The second processor 253 may be configured as a SoC (System on Chip) integrated with a part or all of the second memory 251 and other circuits. The second processor 253 may also be configured as a combination of a CPU (Central Processing Unit) that executes a program and a DSP (Digital Signal Processor) that executes a predetermined arithmetic process. All of the functions of the second processor 253 may be implemented in hardware, or may be configured using a programmable device.

[0030] The second image processing unit 245 expands the image data input from the second communication interface 242 in the frame memory 243. The frame memory 243 includes a plurality of banks. Each bank has a storage capacity capable of writing one frame's worth of image data. The frame memory 243 is configured, for example, by a Synchronous Dynamic Random Access Memory (SDRAM).

[0031] The second image processing unit 245 performs image processing on the image data expanded in the frame memory 243, such as resolution conversion processing or resizing processing, distortion aberration correction, shape correction processing, digital zoom processing, and adjustment of image color and brightness. In addition, the second image processing unit 245 generates a vertical synchronization signal by converting the input frame frequency of the vertical synchronization signal into a drawing frequency. The generated vertical synchronization signal is called an output synchronization signal. The second image processing unit 245 outputs the generated output synchronization signal to the light modulation device driving unit 222.

[0032] The second image processing unit 245 and the frame memory 243 can be configured, for example, by an integrated circuit. The integrated circuit includes an LSI (Large-Scale Integration), an ASIC (Application Specific Integrated Circuit), and a PLD (Programmable Logic Device). The PLD includes, for example, an FPGA (Field-Programmable Gate Array). Furthermore, an analog circuit may be included as part of the configuration of the integrated circuit, or a combination of a processor and an integrated circuit may be used. The combination of a processor and an integrated circuit is called a microcontroller (MCU), SoC, system LSI, chipset, etc.

[0033] The second processor 253 executes the second control program stored in the second memory 251 to perform the following processes. That is, the second processor 253 receives a request signal CM requesting the first information J1 from the document camera 100 via the first communication interface 241. The first information J1 is information necessary for the document camera 100 to establish Miracast (registered trademark) communication with the projector 200. The first information J1 is, for example, the physical address and name of the projector 200. Furthermore, when the second processor 253 receives the request signal CM, the second processor 253 transmits the first information J1 to the document camera 100 via the first communication interface 241.

[0034] The second processor 253 also determines whether or not the second information J2 is received from the document camera 100 via the first communication interface 241 within a predetermined time period from the time the first information J1 is transmitted. The predetermined time period is, for example, 10 seconds. The second information J2 is information indicating that the document camera 100 has received the first information J1. Furthermore, if the second processor 253 does not receive the second information J2 from the document camera 100 within a predetermined time period from the time the first information J1 was transmitted, the second processor 253 displays a message MS indicating that the document camera 100 may not be able to receive the first information J1. For example, the second processor 253 displays the message MS by projecting a text image indicating the message MS as an OSD onto the screen SC. The processing of the second processor 253 is further described with reference to FIG.

[0035] [3. Document camera configuration] FIG. 3 is a diagram showing an example of the configuration of the document camera 100. As shown in FIG. The document camera 100 includes a first control unit 120, a first storage unit 130, a first operation unit 140, a light source 151, a light source control unit 150, a USB interface 161, an HDMI (registered trademark) (High-Definition Multimedia Interface) interface 162, a first image processing unit 170, a resolution conversion unit 180, and an imaging unit 190. In Fig. 3, the USB interface is written as "USB I / F" for convenience, and the HDMI (registered trademark) interface is written as "HDMI I / F" for convenience. The bus 128 communicably connects the first control unit 120 and each unit of the document camera 100. The units of the document camera 100 include a first storage unit 130, a first operation unit 140, a light source control unit 150, a USB interface 161, an HDMI (registered trademark) interface 162, a first image processing unit 170, and a resolution conversion unit 180.

[0036] The first control unit 120 includes a first processor 121 and a first memory 122 , and controls each part of the document camera 100 . The first memory 122 is a storage device that non-volatilely stores programs and data executed by the first processor 121. The first memory 122 is configured with a magnetic storage device, a semiconductor storage element such as a flash ROM, or other types of non-volatile storage devices. The first memory 122 may also include a RAM that configures a work area for the first processor 121. The first memory 122 stores data processed by the first control unit 120 and a first control program executed by the first processor 121. The first storage unit 130 stores various programs executed by the first control unit 120 and data processed by the first control unit 120. For example, the first storage unit 130 stores a program for controlling the imaging unit 190 and the like.

[0037] The first processor 121 may be configured as a single processor, or may be configured such that multiple processors function as the first processor 121. The first processor 121 executes a first control program to control each unit of the document camera 100. For example, the first processor 121 transmits image information corresponding to an image captured by the imaging unit 190 to the projector 200 via the communication dongle 300. The first processor 121 corresponds to an example of "at least one processor."

[0038] The first processor 121 may be configured as an SoC integrated with a part or all of the first memory 122 and other circuits. The first processor 121 may also be configured as a combination of a CPU that executes a program and a DSP that executes a predetermined arithmetic process. All of the functions of the first processor 121 may be implemented in hardware, or may be configured using a programmable device.

[0039] The USB interface 161 is a communication interface that executes communication with the projector 200 in accordance with the USB standard. The USB interface 161 includes a connector for connecting the USB cable 109, and an interface circuit for processing signals transmitted through the connector. The USB interface 161 is an interface board having a connector and an interface circuit, and is connected to a main board on which the first processor 121 and the like of the first control unit 120 are mounted. Alternatively, the connector and interface circuit that constitute the USB interface 161 are mounted on the main board of the first control unit 120. The USB interface 161 transmits a request signal CM and the like to the projector 200, and receives first information J1 and the like from the projector 200. The connector of the USB interface 161 corresponds to an example of a "connection terminal."

[0040] The HDMI (registered trademark) interface 162 is a communication interface that executes communication with the communication dongle 300 in accordance with the HDMI (registered trademark) standard. The HDMI (registered trademark) interface 162 includes a connector to which the communication dongle 300 is connected, and an interface circuit that processes a signal transmitted through the connector. The HDMI (registered trademark) interface 162 is an interface board having a connector and an interface circuit, and is connected to a main board on which the first processor 121 and the like of the first control unit 120 are mounted. Alternatively, the connector and interface circuit that constitute the HDMI (registered trademark) interface 162 are mounted on the main board of the first control unit 120. The HDMI interface 162 transmits image information and the like to the projector 200 via the communication dongle 300. The HDMI (registered trademark) interface 162 and the communication dongle 300 correspond to an example of a "communication interface."

[0041] The communication dongle 300 is attached to a connector of the HDMI (registered trademark) interface 162. The communication dongle 300 executes communication with the projector 200 in accordance with the Miracast (registered trademark) standard. The communication dongle 300 includes an antenna for transmitting and receiving Miracast (registered trademark) signals, and an interface circuit for processing signals transmitted and received by the antenna. The communication dongle 300 transmits image information and the like from the document camera 100 to the projector 200 in accordance with instructions from the first control unit 120.

[0042] The light source 151 is an LED light source that irradiates light onto the subject TG, and is disposed in the camera head 108 shown in Fig. 1. The light source 151 is configured to be capable of adjusting the color temperature of the light it emits. The light source 151 is also configured to be capable of adjusting the amount of light it emits. The light source control unit 150 controls turning on and off the light source 151 according to instructions from the first control unit 120. Furthermore, the light source control unit 150 adjusts the color temperature of the light emitted by the light source 151 according to instructions from the first control unit 120. Furthermore, the light source control unit 150 adjusts the amount of light emitted by the light source 151 according to instructions from the first control unit 120. In this embodiment, the case where the light source 151 is an LED light source will be described, but the light source 151 may be a solid-state light source. For example, the light source 151 may be a laser light source.

[0043] The imaging unit 190 includes an imaging lens 191 and an imaging element 192 such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging lens 191 is made up of a lens or a group of lenses, and constitutes an optical system for capturing an image of a subject TG. The imaging lens 191 is housed in a cylindrical lens barrel 193 and is movable along an optical axis AX. The imaging unit 190 corresponds to an example of a "camera."

[0044] The imaging unit 190 includes a lens operating unit 198 that moves the imaging lens 191 along the optical axis AX. The lens operating unit 198 moves each lens housed in the lens barrel 193 in the direction of the optical axis AX together with the lens barrel 193. In this embodiment, the lens operating unit 198 includes a motor 194 and a gear 199 that transmits the rotational force of the motor 194 to the lens barrel 193. The lens barrel 193 is, for example, cylindrical, and has a configuration in which the distance between the lens barrel 193 and the imaging element 192 changes when the lens barrel 193 is rotated in the circumferential direction about the optical axis AX. Therefore, by driving the motor 194, the lens barrel 193 connected via the gear 199 rotates, and the distance between the imaging lens 191 and the imaging element 192 can be changed. The direction of movement of the lens barrel 193 is opposite when the motor 194 is rotated in the forward direction and when the motor 194 is rotated in the reverse direction. Therefore, the direction of movement of the lens barrel 193 is determined by the direction of rotation of the motor 194 .

[0045] The imaging section 190 includes an output circuit 195 that detects a signal from the imaging element 192 , generates a captured image PT, and outputs it to the first image processing section 170 .

[0046] The first image processing unit 170 is connected to the imaging unit 190, and drives the imaging unit 190 according to control data input from the first control unit 120. The first image processing unit 170 outputs a drive signal to the lens operation unit 198 to operate the motor 194, thereby moving the lens barrel 193. The first image processing unit 170 also performs image processing such as converting the captured image PT output by the output circuit 195 into an image format that can be processed by the first control unit 120, and outputs the processed data to the first control unit 120.

[0047] The control data input from the first control unit 120 to the first image processing unit 170 can be, for example, control data instructing the execution of focus adjustment and control data specifying the optical zoom magnification. When the control data specifying the optical zoom magnification is input from the first control unit 120, the first image processing unit 170 outputs a drive signal to the lens operation unit 198 so as to move the imaging lens 191 according to the specified optical zoom magnification. When the control data instructing the execution of focus adjustment is input from the first control unit 120, the first image processing unit 170 determines the focus state based on the captured image data output by the output circuit 195 and outputs a drive signal to the lens operation unit 198. For example, the first image processing unit 170 performs image processing such as edge detection and contrast measurement on the captured image data to determine the focus state. Then, the first image processing unit 170 moves the imaging lens 191 by the lens operation unit 198, and identifies the optimal position of the imaging lens 191 based on the change in the focus state of the captured image data accompanying the movement of the imaging lens 191.

[0048] The resolution conversion unit 180 performs a process of converting the resolution of the captured image PT output by the first image processing unit 170 into a resolution specified by the first control unit 120. The first control unit 120 determines the resolution of the projection image output from the document camera 100 to the projector 200, and causes the resolution conversion unit 180 to convert to this resolution.

[0049] The first operation unit 140 detects an operation on the operation panel 110 shown in FIG.

[0050] [4. Configuration of the first control section] The first control unit 120 of the document camera 100 includes a determination unit 123, a request unit 124, an establishment unit 125, a detection unit 126, and a notification unit 127. Specifically, the first processor 121 of the first control unit 120 executes a first control program stored in the first memory 122, thereby functioning as the determination unit 123, the request unit 124, the establishment unit 125, the detection unit 126, and the notification unit 127.

[0051] The determination unit 123 determines whether or not the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109 . Furthermore, the determination unit 123 determines whether or not the projector 200 is not connected to the connector of the USB interface 161 via the USB cable 109 after the establishment unit 125 receives the first information J1 from the projector 200. In other words, the determination unit 123 determines whether or not the connection between the connector of the USB interface 161 and the projector 200 via the USB cable 109 has been interrupted after the establishment unit 125 receives the first information J1 from the projector 200.

[0052] When the determination unit 123 determines that the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109, the request unit 124 transmits a request signal CM to the projector 200 via the USB cable 109. The request signal CM is a signal that requests the projector 200 to transmit first information J1, which is information required to establish wireless communication with the projector 200. The first information J1 is information required for the document camera 100 to establish Miracast (registered trademark) communication with the projector 200. The first information J1 is, for example, the physical address and name of the projector 200.

[0053] The establishment unit 125 receives the first information J1 from the projector 200 via the USB cable 109. Then, the establishment unit 125 establishes wireless communication with the projector 200 based on the first information J1. For example, the establishment unit 125 establishes wireless communication with the projector 200 in accordance with the Miracast (registered trademark) standard based on the first information J1. Note that the wireless communication in accordance with the Miracast (registered trademark) standard is executed between a communication dongle 300 attached to a connector of the HDMI (registered trademark) interface 162 of the document camera 100 and the second communication interface 242 of the projector 200. Furthermore, when the establishment unit 125 receives the first information J1 from the projector 200 via the USB cable 109, it transmits the second information J2 to the projector 200 via the USB cable 109. The second information J2 is information indicating that the first information J1 has been received.

[0054] For example, after receiving the first information J1 from the projector 200, if the determination unit 123 determines that the projector 200 is not connected to the connector of the USB interface 161 via the USB cable 109, the establishment unit 125 establishes wireless communication with the projector 200 based on the first information J1. Furthermore, for example, when a wireless connection button on the operation panel 110 is pressed by a user after receiving the first information J1 from the projector 200, the establishment unit 125 establishes wireless communication with the projector 200 based on the first information J1. The wireless connection button is a button pressed by a user when causing the document camera 100 to establish wireless communication with the projector 200.

[0055] The detection unit 126 detects whether or not the USB cable 109 is in a state in which it is possible to transmit a request signal CM. The detection unit 126 detects whether or not the USB cable 109 is in a state in which it is possible to transmit a request signal CM by, for example, a TDR (Time Domain Reflectometry) method.

[0056] The detection unit 126 detects whether or not the connection state of the USB cable 109 to the connector of the USB interface 161 is in a state in which the request signal CM can be transmitted. For example, when the determination unit 123 determines that the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109, the detection unit 126 detects whether or not the projector 200 is connected so as to be able to communicate via the USB interface 161 and the USB cable 109. For example, when at least one of the power line, data line, and clock line constituting the USB communication is not connected, the detection unit 126 detects that the projector 200 is not communicatively connected via the USB interface 161 and the USB cable 109. On the other hand, when the power line, data line, and clock line constituting the USB communication are all connected, the detection unit 126 detects that the projector 200 is communicatively connected via the USB interface 161 and the USB cable 109.

[0057] The notification unit 127 changes the light emission state of the LED 111 after receiving the first information J1 from the projector 200 from a state before receiving the first information J1 from the projector 200. The "light emitting mode" corresponds to an example of the "notification mode." For example, the notification unit 127 causes the LED 111 to blink in green before receiving the first information J1 from the projector 200. Also, for example, the notification unit 127 causes the LED 111 to light up in green after receiving the first information J1 from the projector 200.

[0058] The notification unit 127 changes the light emission mode of the LED 111 when the USB cable 109 is not in a state capable of transmitting the request signal CM from the light emission mode of the LED 111 when the USB cable 109 is in a state capable of transmitting the request signal CM. For example, when the detection unit 126 detects that the USB cable 109 is not in a state in which the request signal CM can be transmitted, the notification unit 127 lights up the LED 111 in red. Also, when the detection unit 126 detects that the USB cable 109 is in a state in which the request signal CM can be transmitted, the notification unit 127 blinks the LED 111 in green or red.

[0059] The notification unit 127 changes the light emission mode of the LED 111 when the connection state of the USB cable 109 to the connector of the USB interface 161 is not in a state in which the request signal CM can be transmitted, from the light emission mode of the LED 111 when the connection state is in a state in which the request signal CM can be transmitted. For example, when the detection unit 126 detects that the connection state of the USB cable 109 to the connector of the USB interface 161 is not in a state in which the request signal CM can be transmitted, the notification unit 127 causes the LED 111 to flash in red. Also, when the detection unit 126 detects that the connection state of the USB cable 109 to the connector of the USB interface 161 is in a state in which the request signal CM can be transmitted, the notification unit 127 causes the LED 111 to flash in green.

[0060] [5. Processing of the First Control Section] FIG. 4 is a flowchart showing an example of the process of the first control unit 120 of the document camera 100. First, in step S101, the determination unit 123 determines whether or not the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109. When the determination unit 123 determines that the projector 200 is not connected to the connector of the USB interface 161 via the USB cable 109 (step S101; NO), the process goes to a standby state. When the determination unit 123 determines that the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109 (step S101; YES), the process proceeds to step S103.

[0061] Then, in step S103, the detection unit 126 detects whether or not the USB cable 109 is in a state in which it is possible to transmit a request signal CM. When the detection unit 126 detects that the USB cable 109 is not in a state in which the request signal CM can be transmitted (step S103; NO), the process proceeds to step S105. Then, in step S105, the notification unit 127 lights up the LED 111 in red. After that, the process returns to step S101. When the detection unit 126 detects that the USB cable 109 is in a state in which it is possible to transmit a request signal CM (step S103; YES), the process proceeds to step S107.

[0062] Then, in step S107, the detection unit 126 detects whether or not the connection state of the USB cable 109 to the connector of the USB interface 161 is in a state in which the request signal CM can be transmitted. When the detection unit 126 detects that the connection state of the USB cable 109 to the connector of the USB interface 161 is not in a state that allows transmission of the request signal CM (step S107; NO), the process proceeds to step S109. Then, in step S109, the notification unit 127 causes the LED 111 to blink in red. After that, the process returns to step S101. When the detection unit 126 detects that the connection state of the USB cable 109 to the connector of the USB interface 161 is such that the request signal CM can be transmitted (step S107; YES), the process proceeds to step S111. Then, in step S111, the notification unit 127 causes the LED 111 to flash in green.

[0063] Next, in step S113, the request unit 124 transmits a request signal CM to the projector 200 via the USB cable 109. The request signal CM is a signal that requests the projector 200 to transmit the first information J1, which is information necessary to establish wireless communication with the projector 200. Next, in step S115, the establishment unit 125 determines whether the first information J1 has been received from the projector 200 via the USB cable 109. If the establishment unit 125 determines that the first information J1 has not been received from the projector 200 via the USB cable 109 (step S115; NO), the process goes to a standby state. If the establishment unit 125 determines that the first information J1 has been received from the projector 200 via the USB cable 109 (step S115; YES), the process proceeds to step S117.

[0064] Then, in step S117, the notification unit 127 lights up the LED 111 in green. Next, in step S119, the establishment unit 125 transmits the second information J2 to the projector 200 via the USB cable 109. The second information J2 is information indicating that the first information J1 has been received. Next, in step S121, the determination unit 123 determines whether or not the connection between the connector of the USB interface 161 and the projector 200 via the USB cable 109 has been interrupted.

[0065] If the determination unit 123 determines that the connection between the connector of the USB interface 161 and the projector 200 via the USB cable 109 has been interrupted (step S121; YES), the process proceeds to step S125. If the determination unit 123 determines that the connection between the connector of the USB interface 161 and the projector 200 via the USB cable 109 has not been interrupted (step S121; NO), the process proceeds to step S123. Then, in step S123, establishing unit 125 determines whether or not the wireless connection button on operation panel 110 has been pressed by the user. If the establishment unit 125 determines that the user has not pressed the wireless connection button on the operation panel 110 (step S123; NO), the process returns to step S121. If the establishment unit 125 determines that the user has pressed the wireless connection button on the operation panel 110 (step S123; YES), the process proceeds to step S125. Then, in step S125, the establishment unit 125 establishes wireless communication with the projector 200 based on the first information J1. After that, the process ends.

[0066] [6. Processing of the Second Control Section] FIG. 5 is a flowchart showing an example of the processing of the second control unit 250 of the projector 200. First, in step S201, the second control unit 250 determines whether or not a request signal CM requesting the first information J1 has been received from the document camera 100 via the first communication interface 241. The first information J1 is information necessary for the document camera 100 to establish Miracast (registered trademark) communication with the projector 200. The first information J1 is, for example, the physical address and name of the projector 200. If the second control unit 250 determines that it has not received a request signal CM from the document camera 100 (step S201; NO), the process goes to a standby state. If the second control unit 250 determines that it has received a request signal CM from the document camera 100 (step S201; YES), the process proceeds to step S203.

[0067] Then, in step S203, the second control unit 250 transmits the first information J1 to the document camera 100 via the first communication interface 241. Next, in step S205, the second control unit 250 determines whether or not a predetermined time has elapsed since the first information J1 was transmitted. The predetermined time is, for example, 10 seconds. If the second control unit 250 determines that the predetermined time has not elapsed since the first information J1 was transmitted (step S205; NO), the process goes to a standby state. If the second control unit 250 determines that the predetermined time has elapsed since the first information J1 was transmitted (step S205; YES), the process proceeds to step S207.

[0068] Then, in step S207, the second control unit 250 determines whether the second information J2 has been received from the document camera 100 via the first communication interface 241. If the second control unit 250 determines that the second information J2 has been received from the document camera 100 (step S207; YES), the process ends. If the second control unit 250 determines that the second information J2 has not been received from the document camera 100 (step S207; NO), the process proceeds to step S209. Then, in step S209, the second control unit 250 displays a message MS indicating that there is a possibility that the document camera 100 will not be able to receive the first information J1, and then the process ends.

[0069] [7. This embodiment and its effects] As described above with reference to Figures 1 to 5, the document camera 100 of this embodiment includes an imaging unit 190 that images a subject TG and generates an imaged image PT of the subject TG, a connector of a USB interface 161 to which a projector 200 that displays the imaged image PT is connected via a USB cable 109, a communication dongle 300 that wirelessly communicates with the projector 200, and a first processor 121. The first processor 121 determines whether the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109, and when it determines that the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109, it transmits a request signal CM to the projector 200 via the USB cable 109 to request the projector 200 to transmit first information J1, which is information necessary to establish wireless communication with the projector 200.

[0070] In this manner, when it is determined that the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109, the first processor 121 transmits to the projector 200 via the USB cable 109 a request signal CM requesting the projector 200 to transmit first information J1, which is information necessary to establish wireless communication with the projector 200. Therefore, the first processor 121 can obtain the first information J1, which is information necessary to establish wireless communication. Therefore, the user does not need to obtain the first information J1, which improves user convenience.

[0071] Furthermore, in the document camera 100 of this embodiment, after receiving the first information J1 from the projector 200, if the first processor 121 determines that the projector 200 is not connected to the connector of the USB interface 161 via the USB cable 109, the first processor 121 establishes wireless communication with the projector 200 based on the first information J1.

[0072] In this way, after receiving the first information J1 from the projector 200, if the first processor 121 determines that the projector 200 is not connected to the connector of the USB interface 161 via the USB cable 109, the first processor 121 establishes wireless communication with the projector 200 based on the first information J1. Therefore, wireless communication with the projector 200 can be established based on the first information J1. Therefore, the user does not need to establish wireless communication with the projector 200 based on the first information J1, which improves user convenience.

[0073] In addition, the document camera 100 of this embodiment is further provided with an LED 111, and the first processor 121 causes the light emission state of the LED 111 after receiving the first information J1 from the projector 200 to be different from the light emission state of the LED 111 before receiving the first information J1 from the projector 200.

[0074] In this way, the first processor 121 causes the light emission mode of the LED 111 after receiving the first information J1 from the projector 200 to differ from the light emission mode of the LED 111 before receiving the first information J1 from the projector 200. Therefore, the user can easily confirm that the first information J1 has been received from the projector 200. This improves user convenience.

[0075] In addition, the document camera 100 of this embodiment is further equipped with an LED 111, and the first processor 121 detects whether the connection state of the USB cable 109 to the connector of the USB interface 161 is in a state in which a request signal CM can be transmitted, and makes the light emission mode of the LED 111 when the connection state of the USB cable 109 to the connector of the USB interface 161 is not in a state in which a request signal CM can be transmitted different from the light emission mode of the LED 111 when the connection state of the USB cable 109 to the connector of the USB interface 161 is in a state in which a request signal CM can be transmitted.

[0076] In this way, the first processor 121 makes the light emission mode of the LED 111 when the connection state of the USB cable 109 to the connector of the USB interface 161 is not in a state in which the request signal CM can be transmitted different from the light emission mode of the LED 111 when the connection state of the USB cable 109 to the connector of the USB interface 161 is in a state in which the request signal CM can be transmitted. Therefore, the user can easily check whether the connection state of the USB cable 109 to the connector of the USB interface 161 is in a state in which the request signal CM can be transmitted, thereby improving user convenience.

[0077] In addition, the document camera 100 of this embodiment is further provided with an LED 111, and the first processor 121 detects whether the USB cable 109 is in a state where it is capable of transmitting a request signal CM, and makes the light emission mode of the LED 111 when the USB cable 109 is not in a state where it is capable of transmitting a request signal CM different from the light emission mode of the LED 111 when the USB cable 109 is in a state where it is capable of transmitting a request signal CM.

[0078] In this way, the first processor 121 makes the light emission mode of the LED 111 when the USB cable 109 is not in a state capable of transmitting the request signal CM different from the light emission mode of the LED 111 when the USB cable 109 is in a state capable of transmitting the request signal CM. Therefore, the user can easily check whether the USB cable 109 is in a state in which the request signal CM can be transmitted, thereby improving user convenience.

[0079] In addition, the display system 1 of this embodiment includes a document camera 100 that captures an image of a subject TG and generates an captured image PT of the subject TG, and a projector 200 that communicates wirelessly with the document camera 100 and displays the captured image PT. The document camera 100 is configured to be connectable to the projector 200 via a USB cable 109, and when the projector 200 is connected via the USB cable 109, the document camera 100 transmits a request signal CM to the projector 200 via the USB cable 109, requesting first information J1 required to establish wireless communication with the projector 200.

[0080] In this way, when the projector 200 is connected to the connector of the USB interface 161 via the USB cable 109, the document camera 100 transmits a request signal CM to the projector 200 via the USB cable 109, requesting the first information J1 necessary to establish wireless communication with the projector 200. Therefore, the document camera 100 can obtain the first information J1, which is information necessary to establish wireless communication. Therefore, the user does not need to obtain the first information J1, which improves user convenience.

[0081] Furthermore, in the display system 1 of this embodiment, after the document camera 100 receives the first information J1 from the projector 200 in response to the request signal CM, it transmits the second information J2 indicating that the first information J1 has been received to the projector 200 via the USB cable 109, and if the projector 200 does not receive the second information J2 from the document camera 100 within a predetermined time after transmitting the first information J1 to the document camera 100, it displays a message MS indicating that the document camera 100 may not be able to receive the first information J1.

[0082] In this way, if the projector 200 does not receive the second information J2 from the document camera 100 within a predetermined time after transmitting the first information J1 to the document camera 100, it displays a message MS indicating that the document camera 100 may not be able to receive the first information J1. This allows the user to easily confirm that there is a possibility that the document camera 100 will not be able to receive the first information J1, thereby improving user convenience.

[0083] 8. Other Embodiments The above-described embodiment is a preferred embodiment, but is not limited to the above-described embodiment and various modifications are possible without departing from the spirit and scope of the present invention.

[0084] In this embodiment, a case will be described in which the "display device" is the projector 200, but the embodiment of the present disclosure is not limited to this. The "display device" may receive and display an image transmitted from the document camera 100. For example, the "display device" may be configured with an LCD (Liquid Crystal Display) or the like.

[0085] In addition, in this embodiment, a case will be described in which the document camera 100 communicates with the projector 200 in accordance with the USB standard, but the embodiment of the present disclosure is not limited to this. The document camera 100 may communicate with the projector 200 via a wired connection. The document camera 100 may also communicate with the projector 200 in accordance with, for example, the HDMI (registered trademark) standard.

[0086] In addition, in this embodiment, a case will be described in which the document camera 100 communicates with the projector 200 in accordance with the Miracast (registered trademark) standard, but the embodiment of the present disclosure is not limited to this. The document camera 100 may communicate with the projector 200 wirelessly. The document camera 100 may also communicate with the projector 200 in accordance with, for example, the Wi-Fi (registered trademark) standard.

[0087] In addition, in this embodiment, a case will be described in which the projector 200 includes a second communication interface 242 that communicates with the document camera 100 in accordance with the Miracast (registered trademark) standard, but the embodiment of the present disclosure is not limited to this. The projector 200 may include, for example, an HDMI (registered trademark) interface, and a communication dongle may be attached to the connector of the HDMI (registered trademark) interface. In this case, the projector 200 communicates with the document camera 100 in accordance with the Miracast (registered trademark) standard via the communication dongle attached to the connector of the HDMI (registered trademark) interface.

[0088] In addition, in this embodiment, a case where the "notification device" is the LED 111 will be described, but the embodiment of the present disclosure is not limited to this. The "notification device" may be, for example, a display device such as an LCD, or a sound output device such as a speaker.

[0089] 2 and 3 show functional configurations, and the specific implementation form is not particularly limited. In other words, it is not necessary to implement hardware corresponding to each functional unit individually, and it is of course possible to implement a configuration in which one processor executes a program to realize the functions of multiple functional units. Also, some of the functions realized by software in the above embodiment may be realized by hardware, or some of the functions realized by hardware may be realized by software. In addition, the specific detailed configurations of each of the other units of the document camera 100 may also be changed as desired without departing from the spirit of the invention.

[0090] In addition, the processing units in the flowcharts shown in Figures 4 and 5 are divided according to the main processing contents in order to facilitate understanding of the processing of the first control unit 120 and the second control unit 250. There is no limitation to the manner of division or names of the processing units shown in the flowcharts shown in Figures 4 and 5, and the processing units can be divided into more processing units according to the processing contents, or one processing unit can be divided to include more processes. In addition, the processing order of the above flowcharts is not limited to the example shown in the figures.

[0091] [Note] The following is a summary of this disclosure. (Supplementary Note 1) A document camera comprising: a camera that captures an image of a subject and generates an captured image of the subject; a connection terminal to which a display device that displays the captured image is connected via a communication cable; a communication interface that wirelessly communicates with the display device; and at least one processor, wherein the at least one processor determines whether the display device is connected to the connection terminal via the communication cable, and when it determines that the display device is connected to the connection terminal via the communication cable, transmits a request signal to the display device via the communication cable, requesting first information, which is information necessary to establish wireless communication with the display device.

[0092] This allows the at least one processor to obtain the first information, which is information necessary for establishing wireless communication with the display device, and therefore eliminates the need for the user to obtain the first information, thereby improving user convenience.

[0093] (Appendix 2) The document camera described in Appendix 1, wherein, after receiving the first information from the display device, the at least one processor determines that the display device is not connected to the connection terminal via the communication cable, and then establishes wireless communication with the display device based on the first information.

[0094] This allows the at least one processor to establish wireless communication with the display device based on the first information, which eliminates the need for the user to establish wireless communication with the display device based on the first information, thereby improving user convenience.

[0095] (Appendix 3) The document camera of Appendix 1 or Appendix 2, further comprising an alarm device, wherein the at least one processor changes the alarm mode of the alarm device after receiving the first information from the display device from a mode of the alarm device before receiving the first information from the display device.

[0096] This allows the user to easily check whether or not the first information has been received from the display device, thereby improving user convenience.

[0097] (Appendix 4) The document camera described in Appendix 1 or Appendix 2, further comprising an alarm device, wherein the at least one processor detects whether the connection state of the communication cable to the connection terminal is in a state in which the request signal can be transmitted, and differentiates the alarm mode of the alarm device when the connection state is not in a state in which the request signal can be transmitted from the alarm mode of the alarm device when the connection state is in a state in which the request signal can be transmitted.

[0098] This allows the user to easily check whether the connection state of the communication cable to the connection terminal is such that a request signal can be transmitted, thereby improving user convenience.

[0099] (Appendix 5) The document camera described in Appendix 1 or Appendix 2, further comprising an alarm device, wherein the at least one processor detects whether the communication cable is in a state capable of transmitting the request signal, and differentiates the alarm mode of the alarm device when the communication cable is not in a state capable of transmitting the request signal from the alarm mode of the alarm device when the communication cable is in a state capable of transmitting the request signal.

[0100] This allows the user to easily check whether the communication cable is in a state in which a request signal can be transmitted, thereby improving user convenience.

[0101] (Appendix 6) A display system comprising a document camera that captures an image of a subject and generates an image of the subject, and a display device that communicates wirelessly with the document camera and displays the captured image, wherein the document camera is configured to be connectable to the display device via a communication cable, and when the display device is connected via the communication cable, the document camera transmits a request signal to the display device via the communication cable requesting first information necessary to establish wireless communication with the display device.

[0102] This allows the document camera to obtain the first information necessary to establish wireless communication with the display device, thereby improving user convenience since the user does not need to obtain the first information.

[0103] (Appendix 7) The display system described in Appendix 6, wherein after the document camera receives the first information from the display device in response to the request signal, the document camera transmits second information indicating that the first information has been received to the display device via the communication cable, and if the display device has not received the second information from the document camera within a predetermined time after transmitting the first information to the document camera, the display device displays a message indicating that the document camera may not be able to receive the first information.

[0104] This allows the user to easily check that there is a possibility that the document camera will not be able to receive the first information, thereby improving user convenience. [Explanation of symbols]

[0105] 1...display system, 100...document camera, 109...USB cable (communication cable), 110...operation panel, 111...LED (alarm device), 120...first control unit, 121...first processor (at least one processor), 122...first memory, 123...determination unit, 124...request unit, 125...establishment unit, 126...detection unit, 127...alarm unit, 130...first storage unit, 140...first operation unit, 161...USB interface, 162...HDMI interface (part of communication interface), 170...first image processing unit, 180...resolution conversion unit, 190...imaging unit (camera), 200...pro Injector (display device), 210...projection unit, 211...light source unit, 212...light modulation device, 213...projection optical system, 215...liquid crystal panel, 220...driving unit, 221...light source driving unit, 222...light modulation device driving unit, 231...second operation unit, 235...input interface, 241...first communication interface, 242...second communication interface, 245...image processing unit, 250...second control unit, 251...second memory, 253...second processor, 300...communication dongle (part of the communication interface), CM...request signal, J1...first information, J2...second information, PL...image light, SC...screen, TG...subject.

Claims

1. a camera for capturing an image of a subject and generating a captured image of the subject; a connection terminal to which a display device for displaying the captured image is connected via a communication cable; A communication interface for wireless communication with the display device; At least one processor; Equipped with The at least one processor determining whether the display device is connected to the connection terminal via the communication cable; when it is determined that the display device is connected to the connection terminal via the communication cable, a request signal for requesting the display device to transmit, to the display device, first information, which is information necessary for establishing wireless communication with the display device, via the communication cable; Document camera.

2. The at least one processor when it is determined that the display device is not connected to the connection terminal via the communication cable after receiving the first information from the display device, establishing wireless communication with the display device based on the first information. The document camera of claim 1 .

3. Further comprising an annunciation device, The at least one processor making an alert mode of the alert device after receiving the first information from the display device different from an alert mode of the alert device before receiving the first information from the display device; 3. The document camera according to claim 1 or 2.

4. Further comprising an annunciation device, The at least one processor detecting whether or not a connection state of the communication cable to the connection terminal is in a state in which the request signal can be transmitted; making the notification mode of the notification device when the connection state is not a state in which the request signal can be transmitted different from the notification mode of the notification device when the connection state is a state in which the request signal can be transmitted; 3. The document camera according to claim 1 or 2.

5. Further comprising an annunciation device, The at least one processor Detecting whether the communication cable is in a state in which the request signal can be transmitted; a notification mode of the notification device when the communication cable is not in a state where the request signal can be transmitted is made different from a notification mode of the notification device when the communication cable is in a state where the request signal can be transmitted; 3. The document camera according to claim 1 or 2.

6. a document camera that captures an image of a subject and generates a captured image of the subject; a display device that wirelessly communicates with the document camera and displays the captured image; Equipped with The document camera includes: A communication device that is connectable to the display device via a communication cable, When the display device is connected via the communication cable, a request signal requesting first information necessary for establishing wireless communication with the display device is transmitted to the display device via the communication cable. Display system.

7. After receiving the first information from the display device in response to the request signal, the document camera transmits second information indicating that the first information has been received to the display device via the communication cable; When the display device has not received the second information from the document camera until a predetermined time has elapsed since the first information was transmitted to the document camera, the display device displays a message indicating that the document camera may not be able to receive the first information.

7. The display system of claim 6.

Images