JP2014013270A - Image display device, control method for the same and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable images displayed in multi-screen mode by a plurality of image display devices to be transmitted to a printer or other devices as a single image.SOLUTION: When projectors 2, 3 are used to display images in multi-screen mode by synchronizing an image to be projected by each projector, the projector 2, for example, obtains image data from the projector 3 based on a frame number for synchronizing images to be displayed in multi-screen mode, merges image data of an image being displayed by itself (the projector 2) and the image data obtained from the projector 3 to produce a single image, and transmits the image as print image data to a printer 4.

Description

  The present invention relates to an image display system that performs multi-screen display using a plurality of image display devices, an image display device such as a projector used therein, a control method for the image display device, and a program.

In recent years, a projector that projects an image signal received from a personal computer (hereinafter referred to as a PC) onto a screen is often used when giving a presentation at a conference or a workshop.
Usually, the PC and the projector perform image signal transmission / reception by analog connection using analog RGB cables. However, with an analog connection, there is an image transmission system that connects a PC and a projector via a network for reasons such as that it takes time to connect, it is difficult to connect from a remote location, and it is desired to connect simultaneously with a plurality of PCs. Attention has been paid.
In order to realize this image transmission system, conventionally, the screen displayed on an image processing apparatus such as a PC is regularly captured, and the image data acquired by the screen capture is transmitted to an image display apparatus such as a projector. ing. Screen capture refers to obtaining image data of a screen displayed on a PC from a demo memory by a driver and temporarily storing it in an internal RAM.
By realizing a plurality of units connected by a network, for example, a screen displayed on a plurality of PCs can be displayed on a multi-screen by a plurality of projectors. Similarly, a plurality of screens such as a primary screen and a secondary screen displayed on one PC can be displayed on a multi-screen by a plurality of projectors.

For example, Patent Literature 1 discloses a technique that enables a display screen of a plurality of terminal devices connected to a network to be displayed on a single screen of a display device. Captured image data transmitted from each terminal device having a screen capture function is received by the communication unit, and the display control unit synthesizes each captured image data into one screen image data by screen division in the display control unit. This enables multi-screen display.
Patent Document 2 discloses a technique related to an image printing method in a multi-screen display system.

JP 2004-054134 A JP 2005-056013 A

However, the prior art disclosed in Patent Document 1 does not provide means for outputting related images displayed on a plurality of display devices at a time.
Further, in the related art disclosed in Patent Document 2, related images displayed on a plurality of display devices from the same PC can be output at a time, but relevance displayed on a plurality of display devices from a plurality of PCs. It was not possible to output a certain image at once.

  The present invention has been made in view of the above points, and an object of the present invention is to enable an image that is displayed on a multi-screen by a plurality of image display devices to be transmitted to a printer or the like as a single image. .

  The image display device of the present invention is an image display device that performs multi-screen display in cooperation with another image display device, and is based on synchronization information for synchronizing display in multi-screen display. Acquisition means for acquiring image data from a display device; composition means for combining image data displayed by the own device and image data acquired by the acquisition means; and transmission means for transmitting image data combined by the combination means It is provided with.

  According to the present invention, it is possible to transmit an image being displayed on a multi-screen by a plurality of display devices to a printer or the like as a single image.

1 is a diagram illustrating a configuration of an image transmission system according to a first embodiment. 1 is a block diagram illustrating a schematic configuration of a PC, a projector, and a printer according to a first embodiment. It is a flowchart which shows the flow of a process of PC concerning 1st Embodiment. It is a flowchart which shows the flow of a process of the projector which concerns on 1st Embodiment. It is a figure which shows the example of the layout setting which displays an image on a some display in PC. 5 is a flowchart showing a flow of printing processing in FIG. 4. 7 is a flowchart showing a flow of image composition processing in FIG. 6. It is a figure which shows the example of the synthetic | combination method of an image. 3 is a flowchart illustrating a processing flow of the printer according to the first embodiment. It is a flowchart which shows the flow of a process of PC which concerns on 2nd Embodiment. It is a flowchart which shows the flow of a process of the projector which concerns on 2nd Embodiment.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a diagram showing a configuration of an image transmission system 10 according to a first embodiment that functions as an image display system to which the present invention is applied. The image transmission system 10 includes a personal computer (hereinafter referred to as a PC) 1 that is an image processing apparatus, projectors 2 and 3 that are image display apparatuses, and a printer 4. The PC 1, the projectors 2 and 3, and the printer 4 form a communication network through the LAN 5.

  The PC 1 has a two-screen display function, and transmits image data displayed on the displays 11 and 12 to the projectors 2 and 3 via the communication network. The projectors 2 and 3 receive the image data sent from the PC 1, convert it into a form that can be output, and display it. The pointer on the window system in the PC 1 is operated by the mouse 1a. The pointer display position is transmitted to the projectors 2 and 3 separately from the image data. The window system referred to here is a GUI (Graphical User Interface) realized by, for example, Windows (registered trademark) which is an operating system (hereinafter referred to as OS) of Microsoft Corporation. The GUI makes it possible to multiplex screen output by assigning unique areas to a plurality of tasks.

  The projector 2 receives the image data displayed on the primary display 11 of the PC 1 from the PC 1 and projects it on the projection plane 13. Further, the projector 3 receives image data displayed on the secondary display 12 of the PC 1 from the PC 1 and projects the image data on the projection surface 14. Thus, the projectors 2 and 3 can perform multi-screen display in cooperation.

  The printer 4 performs printing in response to a printing command from the projectors 2 and 3.

In FIG. 1, one PC 1 is illustrated, but another PC may exist on the LAN 5, and image data may be transmitted from a plurality of PCs to the projectors 2 and 3.
In FIG. 1, two projectors 2 and 3 are illustrated, but other projectors may exist on the LAN 5, and the PC 1 can select a projector to project as appropriate.

Next, referring to FIG. 2, schematic configurations of the PC 1, the projector 2, and the printer 4 are shown. Although only the projector 2 is illustrated, the projector 3 has the same configuration.
The PC 1 includes a CPU 101, a ROM 102 for storing a control program describing a processing procedure of the CPU 101, and a RAM 103 for temporarily storing a control program and data as a work memory. Further, it includes a hard disk drive 104 for storing each program such as an application and OS and data. Further, a network IF 106 that is an interface for communicating with the projector 2, the projector 3, the server, and the like via a LAN or the like, and a user IF 107 that processes user input from a keyboard or a pointing device (such as a mouse) are provided. In addition, a VRAM 108 that stores image data to be displayed by the PC 1, an image processing unit 109, a display control unit 110, displays 11 and 12, and an internal bus 112 that connects these elements are provided. The image processing unit 109 can process an image on each display when there are a plurality of displays. Note that the term “multiple displays” includes both the case where there are a plurality of display devices and the case where a multi-screen display is performed on one display device.

  The projector 2 includes a CPU 201, a ROM 202 for storing a control program describing the processing procedure of the CPU 201, and a RAM 203 for temporarily storing the control program and data as a work memory. In addition, a network IF 205 that is an interface for communicating with the PC 1 or the like via a LAN or the like, and a user IF 206 that processes user input from various operation buttons or an operation remote controller are provided. Further, a projection image control unit 207 for outputting an image, a liquid crystal panel for projecting an input image and a drive driver thereof, a projection unit 208 including a lens, a drive system thereof, and a light source, and an internal connecting these elements And a bus 209.

  The printer 4 includes a CPU 401, a ROM 402, a RAM 403, a network IF 404, an operation panel 405, a printing unit IF 406, a printing unit (printer engine) 407, an external memory 408, and a system bus 409. The CPU 401 comprehensively controls access to various devices connected to the system bus 409 based on a control program stored in the program ROM of the ROM 402 or a control program stored in the external memory 408 to perform printing. An image signal as output information is output to the printing unit 407 connected via the unit IF 406. Further, a control program that can be executed by the CPU 401 is stored in the program ROM of the ROM 402. Further, the font ROM of the ROM 402 stores font data (including outline font data) used for generating the output information. Furthermore, in the case of a printer that does not have an external memory 408 such as a hard disk, the data ROM of the ROM 402 stores information for performing printing processing. The CPU 401 can perform communication processing with the PC 1 and the projectors 2 and 3 via the network IF 404. The RAM 403 mainly functions as a main memory and work area of the CPU 401, and is used for an output information expansion area, an environment data storage area, NVRAM, and the like. As the operation panel 405, switches for operation, LED indicators, and the like are arranged.

In the image transmission system 10 as described above, as shown in FIG. 1, one image is displayed by combining images displayed on the displays 11 and 12 by the PC 1, in other words, images projected by the projectors 2 and 3 on the projection surfaces 13 and 14. It may be displayed on a multi-screen so as to form an image of Further, the images projected by the projectors 2 and 3 do not combine to form a single image, but images that are related to each other may be displayed on a multi-screen. In such a case, there may be a request for printing as one image instead of printing the images projected by the projectors 2 and 3.
Therefore, in this embodiment, as will be described in detail below, when performing multi-screen display while synchronizing the images projected between the projectors 2 and 3, the images projected by the projectors 2 and 3 are taken as one image. Enable printing.

Hereinafter, the processing operation of the image transmission system 10 according to the first embodiment will be described.
The flow of processing by the image transmission program of the PC 1 will be described with reference to FIGS.
FIG. 3A shows a processing flow of the PC 1 for establishing a connection with the projector on the LAN 5.
First, it is determined whether or not the PC display layout setting for displaying images on a plurality of displays is set (step S101). For example, the layout setting can be determined by acquiring the display setting information in the screen property setting in the Windows OS.

Here, regarding the layout setting of the PC display in step S101, an example of layout setting for displaying images on a plurality of displays will be shown using FIGS.
FIG. 5A shows a setting for displaying two screens of the same size on the left and right. As shown in FIG. 5A, a primary display 501 and a secondary display 502 are displayed side by side in the layout setting screen 500 of the PC display.
FIG. 5B shows a setting when two screens having the same size are shifted on the vertical axis and displayed on the left and right. As shown in FIG. 5B, the primary display 501 and the secondary display 502 are displayed on the left and right in the PC display layout setting screen 500, but the vertical Y-axis coordinates are different.
FIG. 5C shows settings for displaying two screens of different sizes on the left and right. As shown in FIG. 5C, different sizes of primary display 503 and secondary display 504 are displayed side by side in the layout setting screen 500 of the PC display.
FIG. 5D shows settings for displaying two screens with different aspect ratios on the left and right. As shown in FIG. 5D, a primary display 505 and a secondary display 506 having different aspect ratios are displayed side by side in the layout setting screen 500 of the PC display.
FIG. 5E shows settings for displaying four screens of the same size. As shown in FIG. 5E, displays 507 to 510 of the same size are displayed in the layout setting screen 500 of the PC display.
In addition to the layout of the PC display shown in FIGS. 5A to 5E, various layout settings can be made.

  If the PC display layout setting for displaying images on a plurality of displays is made in step S101, the PC display layout setting information is acquired (step S102).

Next, it is determined whether or not the transmission images set in the image transmission program of the PC 1 are images displayed on a plurality of displays (hereinafter referred to as display images) (step S103).
If the transmission image is a plurality of display images in step S103, a transmission destination projector for each display image is determined (step S104). The projector to which each display image is transmitted is set via the user IF 107.

Next, in order to establish a connection with the projector that transmits the display image, a connection request is issued to all the transmission destination projectors via the network IF 106 (step S105). The issue request is transmitted by adding unique packet information on a network protocol such as TCP / IP.
If the layout of the PC display that displays an image on a single display is set in step S101, the process proceeds to step S105, and a connection request is issued to the destination projector via the network IF 106.
Similarly, when the transmission image is a single display image in step S103, the process proceeds to step S105, and a connection request is issued to the transmission destination projector via the network IF.

After issuing the connection request in step S105, a notification for the connection request is received from the projector as the connection destination via the network IF 106. If connection is possible, the connection is established, and the process proceeds to step S107. This process ends (step S106).
In step S107, after the connection is established in step S106, a projection screen layout setting request and image information are transmitted to the projector via the network IF 106 in order to set the projection screen layout of the projector. The image information includes the number of images, the size and aspect ratio of each image, whether the images are adjacent to each other, where each image is displayed in the projection screen layout area of each projector, and each image is a single display. It is notified whether the same image is displayed. As shown in FIG. 1, when an image is transmitted from one PC 1 to a plurality of projectors, this image information is notified including the IP addresses of other projectors, image position information, display setting information, and the like. To do.

FIG. 3B shows a processing flow of the PC 1 when a display image is transmitted to the projector on the LAN 5.
First, a display image to be transmitted is captured (step S111). That is, the display control unit 110 designates the coordinates of the image output to the display, and acquires image data from the VRAM 108 in which the output image is stored. When there are a plurality of display images to be transmitted, the image data is acquired from the VRAM 108 by specifying the coordinates of the image output to each display.

  Next, each captured display image data is transmitted to each destination projector via the network IF 106 (step S112). Here, when a plurality of display images are captured, there are a plurality of transmission destination projectors, but they are transmitted to each transmission destination set in step S104 of FIG. Here, a plurality of images can be transmitted to the same projector.

After the transmission of the display image data is completed, if the transmission stop process is executed via the user IF 107, this process ends. If the transmission stop completion process is not executed, the process proceeds to step S114 (step S113).
In step S114, the display control unit 110 checks whether there is an update in the image output to the display. If there is an update, the process returns to step S111, and the image output to the display is acquired from the VRAM 108.

  By performing the above processing, images displayed on the plurality of displays in the PC 1 can be transmitted to the projector on the LAN 5.

The flow of processing of the image display program of the projector 2 will be described with reference to FIGS. 4 (a) and 4 (b). It is assumed that a similar image display program is also executed in the projector 3.
FIG. 4A shows a processing flow of the projector 2 (or projector 3) for establishing a connection with a PC on the LAN 5.
When a connection request from a PC on the LAN 5 is received via the network IF 205 (step S201), it is determined whether or not the connection is possible (step S202).
When the connection is possible in step S202, the PC that has transmitted the connection request is notified via the network IF 205 that the connection has been accepted, and after establishing the connection (step S203), the process proceeds to step S205. To do. If connection is not possible in step S202, the PC that has transmitted the connection request is notified via the network IF 205 that the connection is rejected (step S204), and the process is terminated.

  In step S <b> 205, a projection screen layout setting request and image information of the projector are received from the established PC via the network IF 205. The image information is the number of images, the size and aspect ratio of each image, the images that are adjacent to each other, where each image is displayed in the projected screen layout area, and whether each image is the same image It is information including.

Next, based on the received image information, it is determined whether or not the display is a multi-screen display (step S206).
If the multi-screen display is made in step S206, the frame number held in the RAM 203 is reset (step S207), and this process is terminated. In this embodiment, the frame number is used as synchronization information for synchronizing images between projectors, but time information may also be used. In the case of using time information, before starting image transfer, processing is performed so that the time error is within a predetermined value among a plurality of projectors via the network IF 106 between the projectors. As a time adjustment method, for example, an existing time adjustment protocol such as NTP (Network Time Protocol) or SNTP (Simple Network Time Protocol) is used, and a method of synchronizing time with a predetermined time server is used.

FIG. 4B shows the flow of processing of the projector 2 (or projector 3) when image data is received and displayed from a PC that has established a connection.
After the connection with the PC is established, this program is activated, and enters a state of waiting for receiving image data transmitted from the PC on the LAN 5 via the network IF 205 (step S211).
After receiving the image data, the frame number held in the RAM 203 is incremented (step S212), and the received image data is stored in the RAM 203 in association with the frame number. Since the RAM 203 has a capacity limit, it is assumed that the received image data is stored up to a predetermined number. When the image data is received exceeding the predetermined number, the old image data is overwritten and stored in the RAM 203.

  Next, an area for displaying the received image data is determined and determined (step S213), and the image data is displayed (step S214). When displaying image data, the projection unit 208 projects an image via the projection image control unit 207.

Next, it is determined whether or not there is a print instruction (step S215). If there is no print instruction, the process proceeds to step S217, and if there is a print instruction, the process proceeds to step S216 to perform print processing (step S216). This printing process will be described later.
In step S217, it is determined whether or not the connection with the PC has been disconnected. If disconnected, the process ends. If not, the process returns to step S211 to enter a state of waiting for image data reception.

Here, the flow of the printing process in step S216 will be described with reference to FIG.
It is determined whether or not there is a print instruction from the user via the user IF 206 (step S301). If there is a print instruction, the process proceeds to step S302. Otherwise, the print instruction is kept waiting. The print instruction from the user is executed from, for example, a remote control or an operation button built in the main body.

  Next, it is determined whether or not the display is a multi-screen display (step S302). In the case of multi-screen display, image data is acquired from another projector on the LAN 5 based on the frame number (step S303). The frame number when the multi-screen display is performed is reset in step S207 in FIG. 4A, and is incremented every time image data is received in step S212 in FIG. 4B. 4B, the received image data is stored in the RAM 203 in association with the frame number. Therefore, it is possible to identify an image to be uniquely acquired by transmitting the frame number to another projector. Note that image data may be acquired based on the above-described time information instead of the frame number. In that case, in step S212 of FIG. 4B, the received image data is stored in association with the time information instead of the frame number.

  After obtaining the image data from another projector on the LAN 5, an image composition process is performed (step S304). This image composition processing will be described later.

After the image composition processing, a print command for instructing the printer 4 to execute printing is issued (step S305). The print command includes information such as a paper size, a color mode, and the number of copies.
Assume that the printer 4 is determined from an IP address, a printer model name, and the like that are set in advance as destinations and stored in the ROM 202. In addition, it may be automatically recognized using a discovery protocol.

After issuing a print command to the printer 4, the image data combined in step S304 is transmitted to the printer 4 as print image data (step S306).
The printer continues to wait until a print completion notification is received from the printer 4 via the network IF (step S307). When printing is completed, a print completion screen is displayed and the process is terminated (step S308).

Here, the flow of the image composition processing in step S304 will be described with reference to FIGS.
As for the image composition processing, there are two methods as shown in FIGS. 7A and 7B. Note that the processing in steps S401, S403, and S404 is the same in both FIGS. 7A and 7B, and only steps S402 and S405 are different.
First, in step S303, it is determined whether or not there is an unprocessed image that has not been combined with image data acquired from another projector on the LAN 5 or image data of the projector 2 (or projector 3) itself (step S303). S401). If there is no unprocessed image and all the images have been combined, this processing ends.

  Next, it is determined whether or not the processing target image is an image from the same PC as the processed image (step S402). If the images are not from the same PC, the process returns to step S401, and if the images are from the same PC, the process proceeds to step S403. The reason for determining whether or not the images are from the same PC in step S402 is that if the transmission source is not the same, there is a high possibility that the images are irrelevant, so that they are not combined. It is.

  In FIG. 7A, in order to determine the relevance between the image data, it is determined whether or not the transmission source is the same PC, but the display showing the relevance to the projector 2 and the projector 3 in advance. Display group information such as a group ID may be registered. In that case, as shown in FIG. 7B, the process of step S405 is performed instead of step S402 to determine whether the images have the same display group ID. If the display group ID is not different, the process returns to step S401. If the display group ID is the same image, the process proceeds to step S403.

  Next, it is determined whether or not the image to be processed is an image different from the already synthesized image (step S403). If it is the same image, the process returns to step S401, and if it is a different image, the process proceeds to step S404. When performing multi-screen display with a projector or the like, there is a usage method of distributing and displaying the same image to a plurality of projectors. In the case where the same image is displayed by a plurality of projectors, it is sufficient that only one of these images is printed. Therefore, when the same image exists in the processed image, the composition process is not performed.

In step S404, an image to be processed is synthesized (step S404), and then the process returns to step S401.
The image composition processing in step S404 will be described with reference to FIGS.
FIG. 8A shows an image composition method when projection as shown in FIG. 1 is performed. In FIG. 1, the projector 2 projects an image on the left side, and the projector 3 projects an image on the right side. At the time of printing, an image is synthesized as shown in FIG. 8A based on the relative display position information on the projection surfaces of the projectors 2 and 3. The position information of the projector is set before projection from the image transmission program of the PC 1 or is set directly for each projector by operating the user IF 206 of the projectors 2 and 3.

Further, as shown in FIG. 8B, edge blending may be performed in the image composition processing. Edge blending is a method of projecting the edge portions of an image in an overlapping manner when composing an image projected by a plurality of projectors as one image. The hatched portion in FIG. 8B is a portion where the images overlap. The overlapping portion of the images is processed by adding the image data of the projector 2 and the projector 3 and averaging them when the images are combined. Information such as the width of the overlapping portion is set before projection from the image transmission program of the PC 1 or is set for each projector by operating the user IF 206 of the projectors 2 and 3.
In the present embodiment, an example in which an image is synthesized in consideration of edge blending processing has been described. However, other display setting information may be used for image synthesis. The other display setting information is display setting information related to image correction such as brightness setting, sharpness setting, gamma setting, and keystone correction.
As described above, by setting the projector display position information and the display setting information in advance, it is possible to create a print result by performing an image composition process similar to the projection status of the projector.

The process flow of the print program of the printer 4 will be described with reference to FIG.
First, it is determined whether the end of the program is instructed via the operation panel 405 (step S501). If the end of the program is instructed, this process is terminated. If the end of the program is not instructed, the process proceeds to step S502.
In step S502, the printer waits for a print command from the projector via the network IF 404. If there is a print command, the process proceeds to step S503.
In step S503, image data transmitted after the print command is received, and the received image data is temporarily held in the RAM 403 or the external memory 408. When printing a plurality of sheets, the image data is sequentially received and printed.
Thereafter, the printing unit 407 starts the printing process via the printing unit IF 406 (step S504). In response to the completion of printing, the network IF 404 notifies the projector that printing has been completed (step S505), and the process returns to step S501.

  By performing the above processing, when performing multi-screen display while synchronizing the images projected between the projectors 2 and 3, for example, the projector 2 acquires image data from the projector 3 based on the frame number, and automatically The image data displayed by the projector (projector 2) and the image data displayed by the projector 3 can be combined and printed as a single image.

(Second Embodiment)
In the first embodiment, the projector 2 (or the projector 3) combines images and prints. On the other hand, in the second embodiment, the projector 2 (or the projector 3) receives the original image data from the PC 1 and performs printing. The configuration of the image transmission system according to the second embodiment is the same as that of the first embodiment, and the description thereof is omitted below.

FIG. 10A shows a processing flow of the PC 1 when a display image is transmitted to the projector on the LAN 5. The process for establishing a connection with the projector is the same as that described with reference to FIG.
First, the frame number held internally by the image transmission program of the PC 1 is reset (step S601).
Next, the display image to be transmitted is captured (step S602). That is, the display control unit 110 designates the coordinates of the image output to the display, and acquires image data from the VRAM 108 in which the output image is stored. When there are a plurality of display images to be transmitted, the image data is acquired from the VRAM 108 by specifying the coordinates of the image output to each display.

  Next, each captured display image data is transmitted to each destination projector via the network IF 106 (step S603). Here, when a plurality of display images are captured, there are a plurality of transmission destination projectors, but they are transmitted to each transmission destination set in step S104 of FIG. Here, a plurality of images can be transmitted to the same projector.

  After the transmission of the display image data is completed, the image data is stored in association with the frame number (step S604). If a plurality of display images are captured in step S603, all the plurality of display image data are saved. After storing the image data, the frame number is incremented (step S605).

If the transmission stop process is executed via the user IF 107, the present process is terminated. If the transmission stop completion process is not executed, the process proceeds to step S607 (step S606).
In step S607, the display control unit 110 checks whether the image output to the display is updated. If there is an update, the process returns to step S601, and the image output to the display is acquired from the VRAM 108.

FIG. 10B shows the flow of processing of the PC 1 when receiving an original image request for printing from the projector.
The process continues to wait until an original image request is received from the projector via the network IF 106 (step S611). When the original image request is received, the process proceeds to step S612. The original image request is a packet composed of an operation code indicating that it is an original image request and a frame number for identifying the requested image on a network stack such as TCP / IP.
When the original image request is received, the same image as the image identification ID added to the original image request is discriminated from the images stored in the RAM 103, and the corresponding image data is sent to the projector via the network IF 106. Transmit (step S612).
After transmitting the image data, it is determined whether or not the program has been terminated via the user IF 107 (step S613). If the program has not been terminated, the process returns to step S611 to wait for reception of the original image request. If the program has been terminated, this processing is terminated.

FIG. 11A shows a processing flow of the projector 2 (or projector 3) when image data is received and displayed from a PC that has established a connection. The process for establishing a connection with the PC is the same as that described with reference to FIG.
After the connection with the PC is established, this program is started and the frame number is reset (step S701). Then, it waits for reception of image data transmitted from the PC on the LAN 5 via the network IF 205 (step S702).

Next, an area for displaying the received image data is determined and determined (step S703), and the image data is displayed (step S704). When displaying image data, the projection unit 208 projects an image via the projection image control unit 207.
After the image data is projected, the frame number held in the RAM 203 is incremented (step S705). Then, it is determined whether or not the connection with the PC has been disconnected (step S706). If the connection has been disconnected, the process ends. If not, the process returns to step S702 to wait for image data reception.

FIG. 11B shows the flow of processing of the projector 2 (or projector 3) when a print instruction from the user is received via the user IF 206.
It is determined whether or not a print instruction from the user has been received via the user IF 206 (step S711). If there is a print instruction, the process proceeds to step S712. Otherwise, the print instruction is kept waiting. The print instruction from the user is executed from, for example, a remote control or an operation button built in the main body.

When the print instruction is received, the original image data is acquired from the PC based on the frame number (step S712). The image transmission process of the PC 1 is as described with reference to FIG. Since the PC 1 holds the image data displayed on the multi-screen, after the image data is received by the projector 2, an image composition process is not necessary.
After acquiring the image data from the PC 1, a print command for instructing the printer 4 to execute printing is issued (step S713).

After issuing a print command to the printer 4, the image data acquired from the PC in step S712 is transmitted to the printer 4 as print image data (step S714).
The process continues to wait until a print completion notification is received from the printer 4 via the network IF (step S715). When printing is completed, a print completion screen is displayed and the process is terminated (step S716).
The printing process of the printer 4 is as described with reference to FIG. 9 in the first embodiment, and the description thereof is omitted here.

  By performing the above processing, when performing multi-screen display while synchronizing the images projected between the projectors 2 and 3, for example, the projector 2 acquires the original image data transmitted from the PC 1 to a plurality of projectors. Thus, it is possible to print as one image.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.
(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program. It is a process to be executed.

Claims (16)

An image display device that performs multi-screen display in cooperation with other image display devices,
Acquisition means for acquiring image data from the other image display device based on synchronization information for synchronizing display in multi-screen display;
Synthesizing means for synthesizing the image data displayed by the own device and the image data acquired by the acquiring means;
An image display apparatus comprising: a transmission unit that transmits the image data synthesized by the synthesis unit.   The image display apparatus according to claim 1, wherein the synchronization information is an image frame number or time information.   The image display device according to claim 1, wherein the synthesizing unit synthesizes the image data based on display position information when the image display devices display image data.   The image display device according to claim 1, wherein the synthesizing unit synthesizes the image data based on display setting information when each of the image display devices displays image data.   5. The composition means according to claim 1, further comprising a judging means for judging the relevance between the image data, wherein only the image data judged to be relevant by the judging means is synthesized. The image display device according to claim 1.   The image display apparatus according to claim 5, wherein the determination unit determines that image data having the same transmission source is relevant.   6. The image according to claim 5, wherein the determination unit determines that image data having the same display group information is related based on display group information registered between the image display devices. Display device.   8. The composition means according to claim 1, wherein if the image data to be synthesized is the same as already synthesized image data, the composition means does not synthesize the image data to be synthesized. The image display device described in 1. When there is a print instruction,
The acquisition means acquires image data from the other image display device based on synchronization information for synchronizing display in multi-screen display,
The synthesizing unit synthesizes the image data displayed by the own device and the image data acquired by the acquiring unit,
The image display apparatus according to claim 1, wherein the transmission unit transmits the image data combined by the combining unit to a printer. An image display device that performs multi-screen display in cooperation with another image display device for an image transmitted from an image processing device,
Acquisition means for acquiring original image data of multi-screen display from the image processing device;
An image display apparatus comprising: a transmission unit that transmits the original image data acquired by the acquisition unit. An image display system that performs multi-screen display using a plurality of image display devices,
At least one image display device among the plurality of image display devices is
An acquisition means for acquiring image data from another image display device among the plurality of image display devices based on synchronization information for synchronizing display in multi-screen display;
Synthesizing means for synthesizing the image data displayed by the own device and the image data acquired by the acquiring means;
An image display system comprising: transmission means for transmitting the image data synthesized by the synthesis means. An image display system that performs multi-screen display on a plurality of image display devices for an image transmitted from an image processing device,
At least one image display device among the plurality of image display devices is
Acquisition means for acquiring original image data of multi-screen display from the image processing device;
An image display system comprising: transmission means for transmitting original image data acquired by the acquisition means. A method of controlling an image display device that performs multi-screen display in cooperation with another image display device,
Acquiring image data from the other image display device based on synchronization information for synchronizing display in multi-screen display;
Synthesizing the image data displayed by the device and the acquired image data;
And a step of transmitting the combined image data. A method of controlling an image display device that performs multi-screen display in cooperation with another image display device for an image transmitted from an image processing device,
Obtaining original image data of multi-screen display from the image processing device;
And a step of transmitting the acquired original image data. A program for controlling an image display device that performs multi-screen display in cooperation with other image display devices,
Acquisition means for acquiring image data from the other image display device based on synchronization information for synchronizing display in multi-screen display;
Synthesizing means for synthesizing the image data displayed by the own device and the image data acquired by the acquiring means;
A program for causing a computer to function as transmission means for transmitting image data synthesized by the synthesis means. A program for controlling an image display apparatus that performs multi-screen display in cooperation with another image display apparatus for an image transmitted from an image processing apparatus,
Acquisition means for acquiring original image data of multi-screen display from the image processing device;
A program for causing a computer to function as transmission means for transmitting original image data acquired by the acquisition means.

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