JP2013205773A - Display system, image generation device, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display system, an image generation device, and a computer program capable of preventing a newly added layer image from being displayed in a state unintended by a user.SOLUTION: A shared screen control device displays an image in which a plurality of layers are superimposed upon each other on a shared display (S11), and transmits image data and layer information on each layer to each terminal device (S12). When the terminal device accepts an additional layer (S15: YES), the terminal device sets the layer information including a layer number of the additional layer (S16), displays an image in a state including the additional layer on a display section of the terminal device (S17), and transmits image data and layer information on the additional layer to the shared screen control device (S18).

Description

  The present invention relates to a display system, an image generation apparatus, and a computer program that display an image composed of a plurality of layers.

  There is known an image display system that displays an image by operating an image displayed on one shared display with a plurality of operation terminals connected to the shared display through a communication line. In such an image display system, if data input from another operation terminal is received while an image displayed on the shared display is being edited on a certain operation terminal, confusion among users operating each operation terminal occurs. Therefore, it is necessary to always limit the number of operation terminals that permit data input to one. However, while the shared display is operated by a certain operation terminal, input cannot be received from other operation terminals. Therefore, the larger the number of operation terminals, the longer the input waiting time and the longer the editing time. There was a problem of becoming.

  As a means for solving such a problem, for example, in Patent Document 1, in an apparatus including a shared display and a plurality of operation terminals connected to the shared display, each image sent from each operation terminal is used as a layer image. An apparatus is disclosed that allows multiple users to work simultaneously by individually managing and synthesizing a plurality of layer images and displaying them on a shared display.

JP 2004-317583 A

  However, in the apparatus described in Patent Document 1, since a new layer image is combined with another layer image and displayed on a shared display, the new layer image sent from the operation terminal is not intended to be edited by the editor. The user may conceal part of the image, or part of the new layer image sent from the operation terminal may be hidden behind the other layer image in a manner not intended by the user, resulting in confusion among users. There is a problem.

  The present invention has been made in view of such circumstances, so that even if the number of operation terminals increases, the input waiting time does not become long, and a newly added layer image is displayed in a state unintended by the user. It is an object to provide a display system, an image generation apparatus, and a computer program that can be prevented.

  A display system according to the present invention is connected to a display device, a plurality of image transmission devices that transmit image data to display an image on the display device, and the image transmission device connected to the display device and the plurality of image transmission devices. In the display system comprising: an image generation device that receives the image data transmitted from and generates a display image to be displayed on the display device based on the received image data, the image generation device includes a plurality of image data; In order to generate a display image in which an image based on each image data is overlaid as a layer, storage means for storing rank information for determining the rank of the layer for each image data, and for each image data based on the rank information Means for generating a display image by superimposing images based thereon, and image data and order information stored in the storage means for each image transmission device Means for transmitting, each image transmitting apparatus receiving means for receiving image data and order information transmitted from the image generating apparatus, means for receiving image data to be added as a layer, and for the received image data And means for setting a rank different from the rank included in the rank information, and means for transmitting the image data and information on the rank set in the image data to the image generation apparatus, the image generation apparatus comprising: The image processing apparatus includes: means for receiving image data and order information transmitted from the image transmitting apparatus; and means for updating a display image to be displayed on the display apparatus based on the received image data and order information. .

  In the display system according to the present invention, each image transmission device identifies a means for receiving selection of image data to be changed, a means for receiving image data after the change, and the selected image data. Means for transmitting the received information and the changed image data to the image generation device, the image generation device receiving the information transmitted from the image transmission device and the changed image data; Means for storing the changed image data in the storage means instead of the image data specified by the information.

  In the display system according to the present invention, each image transmission apparatus receives a selection of image data to be deleted from received image data, and information for specifying the image data selected by the means. Means for transmitting to the image generating apparatus, means for receiving the information transmitted from the image transmitting apparatus, means for deleting the image data specified by the received information from the storage means, and the image And a means for erasing the ranking determined for the data from the ranking information.

  An image generation apparatus according to the present invention includes a storage unit that stores a plurality of image data, and an image generation apparatus that generates an image based on the image data stored in the storage unit generates an image based on each image data. In order to generate one image superimposed as a layer, means for storing rank information that determines the rank of the layer for each image data, and by superimposing images based on each image data based on the rank information, Means for generating one image, means for transmitting image data and order information stored in the storage means to an external device, image data transmitted from the external device and the image data set It is characterized by comprising means for receiving rank information and means for updating the one image based on the received image data and rank information.

  A computer program according to the present invention, in a computer program for causing a computer to generate one image from a plurality of image data, causes the computer to generate one image in which images based on each image data are superimposed as a layer. A process for generating one image by superimposing images based on the respective image data using the rank information that defines the layer rank for each image data, and transmitting the image data and the rank information to an external device. Processing, processing for receiving image data transmitted from the external device and information on the order set for the image data, and processing for updating the one image based on the received image data and information on the ranking Are executed.

  In the present invention, when a new image is added from each terminal device (image output device) to an image composed of a plurality of layer images displayed on the display device, the display image being displayed is received as a plurality of layer images, After the layer display order is set with the image to be added as an additional layer image, the new additional layer image is sent together with the layer information (order information) and displayed on the display device. As a result, even when the number of terminal devices using a shared display device is large, it is possible to prevent the waiting time for input from becoming long and to hide images processed by other users unintentionally. The confusion caused by doing so is avoided.

  Further, in the present invention, when a new additional layer image is displayed on the display device, the additional layer image is transmitted to each terminal device (image output device), and thus the same as the image displayed on the display device. Images can be displayed on each image output device. Therefore, even when a new image is added, it is possible to prevent the layer information of the additional layer image to be newly added from overlapping due to the time lag.

  In the present invention, when only a specific layer image is changed from among the plurality of layer images displayed on the display device, the display image being displayed is received as the plurality of layer images, and the changed layer image to be changed is Since it is sent together with the layer information and displayed on the display device, it is possible to prevent the input waiting time from becoming long even when the number of terminal devices is large.

  In the present invention, the terminal device (image output device) designates a layer image to be deleted from a plurality of layer images received from the image generation device, and transmits it to the image transmission device. Even when the number of terminal devices used is large, it is possible to prevent an input waiting time from becoming long when a specific layer image is deleted.

  According to the present invention, it is possible to prevent an input waiting time from becoming long even when the number of terminal devices using a shared display device is large. Further, confusion caused by unintentionally hiding images processed by other users can be avoided.

It is a schematic diagram which shows the whole structure of the display system which concerns on this Embodiment. It is a schematic diagram which shows the example of a display in a shared display. It is a conceptual diagram which shows an example of the layer table which the shared screen control apparatus manages. It is a schematic diagram which shows the operation screen in a terminal device. It is explanatory drawing explaining operation at the time of moving an additional layer. It is a conceptual diagram which shows an example of the layer table after an update. It is a schematic diagram which shows the example of a display after an update. It is a block diagram which shows the functional structure of a shared display, a shared screen control apparatus, and a terminal device. 4 is a flowchart illustrating a processing procedure in the display system according to the first embodiment. 10 is a flowchart for explaining a processing procedure in the display system according to the second embodiment. 10 is a flowchart for explaining a processing procedure in the display system according to the third embodiment.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing an overall configuration of a display system according to the present embodiment. The display system according to the present embodiment is connected to a shared display 10 that displays an image, a shared screen control device 20 that outputs image data to the shared display 10, and a shared screen control device 20, and is operated by a user. A plurality of terminal devices 30A, 30B,..., 30E are provided.

  The shared display 10 is a display device such as a liquid crystal display having a relatively large display screen, and includes an input interface 11 for image data such as HDMI (High-Definition Multimedia Interface) and DVI (Digital Visual Interface) (see FIG. 8). The shared display 10 is connected to the shared screen control device 20 via the input interface 11, acquires the image data output from the shared screen control device 20, and displays an image based on the acquired image data.

The shared screen control device 20 is, for example, a server device. The shared screen control device 20 includes a communication interface 26 for connecting to a communication network N such as a LAN (Local Area Network) (see FIG. 8), and a plurality of terminal devices 30A, 30B, ..., connected to 30E. In addition, the shared screen control device 20 includes an interface such as HDMI or DVI as the output interface 25 for image data (see FIG. 8), and is connected to the above-described shared display 10 via the output interface 25.
The shared screen control device 20 manages images to be displayed on the shared display 10. Specifically, in order to display on the shared display 10 an image in which a plurality of layers are superimposed, a layer table that stores image data constituting each layer and the order of superimposition of each layer in association with each other is provided. The shared screen control device 20 superimposes the image data of each layer according to the order defined by the layer table and outputs it from the output interface 25, thereby displaying one display image in which a plurality of layers are superimposed on the shared display 10. Let

The terminal devices 30A, 30B,..., 30E are, for example, personal computers, tablet terminals, and the like, and display screen 34 for displaying images, operation unit 33 for accepting user operations, and shared screen control via a communication network N. A communication interface 35 connected to the apparatus 20 is provided (see FIG. 8). In the following description, when it is not necessary to distinguish between the plurality of terminal devices 30A, 30B,.
The terminal device 30 can display an arbitrary image on the display unit 34 of its own device. Also, the terminal device 30 can display the image selected by the user on the shared display 10 as one of a plurality of layers by transmitting it to the shared screen control device 20 and adding it to the layer. . The user can operate the terminal device 30 to arbitrarily set which layer the image selected by the user is to be displayed.

  In the example shown in FIG. 1, the configuration in which the five terminal devices 30A, 30B,..., 30E are connected to the communication network N has been described, but the number connected to the communication network N is limited to five. It is not a thing. In addition, the connection between the shared screen control device 20 and the terminal device 30 may be wired or wireless.

  In the present embodiment, since the shared display 10 is shared by the user of each terminal device 30, it is desirable that the display screen is arranged at a position that can be viewed by the user of each terminal device 30. However, as will be described later, the shared screen control device 20 transmits image data of each layer to be displayed on the shared display 10 to each terminal device 30 via the communication network N, and each terminal device 30 sets each layer. Since the superimposed images can be displayed, some of the terminal devices 30 may be connected to a place where the display screen of the shared display 10 cannot be browsed directly.

  FIG. 2 is a schematic diagram showing a display example on the shared display 10. Each terminal device 30 transmits an image to be displayed on the shared display 10 to the shared screen control device 20 via the communication network N. For example, image data constituting layers of “background”, “mobile body 1”, “mobile body 2”, and “mobile body 3” are transmitted from the terminal devices 30A to 30D, respectively. It is assumed that layer information is managed. At this time, the shared screen control device 20 generates image data in which the layers of “background”, “moving body 1”, “moving body 2”, and “moving body 3” are superimposed, and transmits them to the shared display 10. . The shared display 10 displays an image based on the image data from the shared screen control device 20, thereby displaying a single display image in which the layers are superimposed as shown in FIG.

The order of superimposing each layer depends on the layer table managed by the shared screen control device 20. FIG. 3 is a conceptual diagram illustrating an example of a layer table managed by the shared screen control device 20. The layer table stores the layer name and layer number of each table and the file name of the image data constituting each layer in association with each other. Here, the layer name is an identifier for identifying each layer, and represents a name given by a user who operates the terminal device 30. The layer number is an identifier for defining the order in which the layers are overlapped, and is automatically given by each terminal device 30. In this embodiment, an integer value is assigned as an identifier, and layers are superimposed in ascending order of the assigned integer value. That is, in the present embodiment, the layer having the smallest layer number among the layer numbers stored in the layer table is the backmost layer, and the layer having the largest layer number is the foremost layer. In the layer table shown in FIG. 3, the “background” layer having the layer number of 1000 is the backmost layer, and the “mobile 3” layer having the layer number of 4000 is the foremost layer. It is prescribed.
In the following description, a set of records stored in a layer table, a layer name, a layer number, and a file name is referred to as layer information.

  FIG. 4 is a schematic diagram showing an operation screen in the terminal device 30. When a layer addition request is received from the operation unit 33 of the terminal device 30, an operation screen 340 as illustrated in FIG. 4 is displayed on the display unit 34 of the terminal device 30. The operation screen 340 includes, for example, a layer display area 341 that displays an image of each layer, a layer control field 342 that displays a layer structure, and a layer addition button that is pressed when selecting image data (file) to be added to the layer 343 and a layer transmission button 344 that is pressed when transmitting an additional layer.

  The terminal device 30 acquires layer information registered in the shared screen control device 20 at an appropriate timing, and displays the layer name of each layer in the layer control column 342 of the operation screen 340. When the layer addition button 343 is pressed down and the user selects image data to be added to the layer, the terminal device 30 displays an image based on the selected image data in the layer display area 341 and The layer name of the layer (additional layer) constituted by the image is added to the layer control column 342. The terminal device 30 may automatically give a default name such as “new layer” to a layer to be newly added, or the user may enter an arbitrary name. The example illustrated in FIG. 4 indicates that the name “telop” is given by the user as the layer name of the additional layer.

When the image data of the additional layer is selected by the terminal device 30, the terminal device 30 gives a layer number to the image data. For example, in order to display a newly added layer on the foreground on the shared display 10, a configuration may be adopted in which the largest layer number is given. In the example shown in FIG. 3, since layer numbers 1000 to 4000 have already been assigned, for example, a layer number of 5000 is assigned to image data to be newly added as a layer. At this time, when the layer transmission button 344 is pressed and a transmission instruction is given, the terminal device 30 transmits the image data selected by the user and the layer information of the image data to the shared screen control device 20.
When the new screen information is received from the terminal device 30, the shared screen control device 20 updates the layer information managed in the layer table and updates the display on the shared display 10. Thereby, the layer newly added by the user is displayed on the foreground on the shared display 10.

In addition, an operation for moving a layer may be accepted on the operation screen 340 of the terminal device 30. FIG. 5 is an explanatory diagram illustrating an operation when moving an additional layer. In the layer control column 342 of the operation screen 340, the layer name of the additional layer and the layer name of each layer currently displayed on the shared display 10 are displayed. By accepting an operation (drag operation) for moving the additional layer in the layer control column 342, the additional layer is moved between arbitrary layers.
The terminal device 30 automatically assigns a layer number according to the destination of the additional layer. For example, in the case of having the layer structure shown in FIG. 3, when an additional layer is moved between the “background” layer and the “mobile 1” layer, a value between the layer numbers (for example, intermediate) A layer number is assigned to the image data of the additional layer.

  At this time, when the layer transmission button 344 is pressed and a transmission instruction is given by the user, the terminal device 30 displays the image data of the additional layer (image data selected by the user) and the layer information of the image data. It transmits to the shared screen control apparatus 20. When the shared screen control device 20 receives new layer information from the terminal device 30, the shared screen control device 20 updates the managed layer table and updates the display on the shared display 10. As a result, the layer moved by the user operation is displayed between the “background” layer and the “mobile 1” layer on the shared display 10.

  FIG. 6 is a conceptual diagram illustrating an example of the updated layer table, and FIG. 7 is a schematic diagram illustrating a display example after the update. In the example shown in FIG. 6, layer information assigned with layer number 1500 is added to the layer table. The shared screen control device 20 generates a display image in which the layers are superimposed according to the layer table, and outputs the display image to the shared display 10, thereby displaying the display image as illustrated in FIG. 7 on the display unit 13 of the shared display 10. Will be.

Hereinafter, the configuration of the display system according to the present embodiment will be described.
FIG. 8 is a block diagram illustrating functional configurations of the shared display 10, the shared screen control device 20, and the terminal device 30. The shared display 10 includes an input interface 11, a display control unit 12, and a display unit 13. The input interface 11 is an interface for acquiring image data such as HDMI and DVI. The display control unit 12 causes the display unit 13 to display an image by generating a display signal and the like based on the image data input from the input interface 11 and sending it to the display unit 13 at an appropriate timing. The display unit 13 includes, for example, a liquid crystal panel in which a large number of liquid crystal pixels are arranged, and displays an image by performing writing scanning to the liquid crystal pixels based on a display signal or the like from the display control unit 12.

The shared screen control device 20 includes a control unit 21, a storage unit 22, a layer information management unit 23, an image generation unit 24, an output interface 25, and a communication interface 26.
The control unit 21 includes a CPU, a RAM, and the like, and controls the operation of each hardware unit included in the shared screen control device 20. The storage unit 22 includes a storage such as a hard disk and a flash memory, and a part of the storage area includes a layer information storage area 221 that stores the above-described layer table, and an image data storage that stores image data received through the communication interface 26. The area 222 is used as a program storage area 223 for storing various computer programs. The computer program stored in the program storage area 223 includes a control program for controlling the operation of each part of the hardware included in the shared screen control device 20, the computer program according to the present invention, and the like. The control unit 21 controls the operation of each unit by reading and executing the control program from the storage unit 22, and reads and executes the computer program according to the present invention from the storage unit 22 to thereby implement the entire apparatus in the present invention. It functions as such an image generation apparatus.

  When the layer information management unit 23 receives the image data and the layer information transmitted from each terminal device 30 through the communication interface 26, the layer information management unit 23 stores the image data in the image data storage area 222 and stores the layer information in the layer information storage area. The process of registering in the layer table in 221 is performed, and the two are associated.

  The image generation unit 24 sequentially reads image data in ascending order of layer numbers in accordance with the layer information registered in the layer table, generates an image in which a plurality of layers are superimposed, and displays image data for display from the output interface 25. Is output.

  The terminal device 30 includes a control unit 31, a storage unit 32, an operation unit 33, a display unit 34, and a communication interface 35. The control unit 31 includes a CPU, a RAM, and the like, and controls the operation of each hardware unit included in the terminal device 30. The storage unit 32 includes a storage such as a hard disk and a flash memory, and displays the control program for controlling each hardware unit of the terminal device 30, the application program for displaying the operation screen as described above, and the shared display 10. The image data for storing is stored. The control unit 31 reads the control program and application program described above from the storage unit 32 and executes them, thereby causing the entire apparatus to function as the image transmission apparatus according to the present invention. The image data to be displayed on the shared display 10 does not need to be stored in the storage unit 32 in advance. The image data generated inside the terminal device 30 and the image acquired from the outside through the communication interface 35 are used. Data may be included.

The operation unit 33 includes input devices such as a keyboard, a mouse, and a touch panel, and accepts an operation by a user. The operation received by the operation unit 33 includes an operation for selecting image data to be displayed on the shared display 10, an operation for starting the operation screen shown in FIG. 4, an operation for moving a layer to an arbitrary place on the operation screen, and a selection An operation for giving a transmission instruction for image data is included.
The display unit 34 includes a display device such as a liquid crystal display, and displays the above-described operation screen, information to be notified to the user, and the like.

  The communication interface 35 is a means for connecting to the communication network N, receives image data and layer information transmitted from the shared screen control device 20, and also adds image data and a layer of the image data that the user adds as a layer. Information is transmitted to the shared screen control device 20.

  FIG. 9 is a flowchart for explaining a processing procedure in the display system according to the first embodiment. It is assumed that the shared screen control device 20 has already acquired image data and layer information from a plurality of terminal devices 30, 30,. The image generation unit 24 of the shared screen control device 20 refers to the layer information registered in the layer table, sequentially acquires target image data from the image data storage area 222, and generates an image in which each layer is superimposed. To do. The control unit 21 of the shared screen control device 20 outputs the generated image to the shared display 10 from the output interface 25, thereby displaying an image in which a plurality of layers are superimposed on the shared display 10 (step S11).

  Next, the shared screen control device 20 transmits the image data of each layer stored in the image data storage area 222 and the layer information registered in the layer table to each terminal device 30 (step S12). In the present embodiment, after displaying on the shared display 10, the image data and layer information of each layer are transmitted to the terminal device 20. However, when a request from the terminal device 30 is received, It is good also as a structure which returns the image data and layer information of each layer.

When the terminal device 30 receives the image data and the layer information transmitted from the shared screen control device 20 (step S13), the terminal device 30 stores the image data and the layer information in the storage unit 32 (step S14).
Next, the control unit 31 of the terminal device 30 determines whether an additional layer has been received through the operation unit 33 (step S15). For example, when the layer addition button 343 is pressed on the operation screen 340 as shown in FIG. 4 and an image data file is selected as the layer to be added, the control unit 31 can determine that the additional layer has been accepted. . If no additional layer has been received (S15: NO), the process waits until an additional layer is received.

  When the additional layer is accepted (S15: YES), the layer information management unit 23 sets the layer information of the additional layer (step S16). At this time, the layer information management unit 23 assigns the name “new layer” as the layer name, and assigns a value greater than any layer number stored in step S14 as the layer number. When a new layer name is input through the operation unit 33, the layer information management unit 23 assigns the input layer name as the layer name of the additional layer. When the operation unit 33 accepts an operation for moving the additional layer, the layer information management unit 23 assigns a layer number corresponding to the destination location to the image data of the additional layer.

  The control unit 31 superimposes layers including additional layers and displays them on the display unit 34 (step S17). Next, the control unit 31 transmits the image data and layer information of the additional layer to the shared screen control device 20 through the communication interface 35 (step S18).

  When the shared screen control device 20 receives the image data and layer information of the additional layer transmitted from the terminal device 30 (step S19), the shared screen control device 20 stores the image data and layer information in the storage unit 22 (step S20). At this time, the layer information management unit 23 stores the received image data as image data of the additional layer in the image data storage area 222 and registers the received layer information in the layer table in the layer information storage area 221. Do.

  As described above, in the present embodiment, when a new image is added from each terminal device 30 to an image composed of a plurality of layer images displayed on the shared display 10, the displayed display image is displayed as a plurality of layer images. As received from the shared screen control device 20. Each terminal device 30 sets the display order of the layers using the newly added image as the additional layer image, and then transmits the new additional layer image together with the layer information to the shared screen control device to be displayed on the shared display. As a result, even when the number of the terminal devices 30 using the shared display 10 is large, it is avoided that the waiting time for input is lengthened, and images processed by other users are hidden unintentionally. Can be prevented from being confused.

Embodiment 2. FIG.
In the first embodiment, the terminal device 30 receives an additional layer, the shared screen control device 20 performs layering including the additional layer, and displays an image of the superimposed layer on the shared display 10. However, the structure which receives the change of the image displayed as a layer in each terminal device 30 may be sufficient.
In the second embodiment, a configuration for changing an image of an existing layer will be described. Note that the overall configuration of the display system and the internal configuration of each device are exactly the same as those in the first embodiment, and a description thereof will be omitted.

  FIG. 10 is a flowchart for explaining a processing procedure in the display system according to the second embodiment. It is assumed that the shared screen control device 20 has already acquired image data and layer information from a plurality of terminal devices 30, 30,. The image generation unit 24 of the shared screen control device 20 refers to the layer information registered in the layer table and generates an image in which the layers are superimposed. The control unit 21 outputs the image generated by the image generation unit 24 to the shared display 10 and causes the shared display 10 to display an image in which a plurality of layers are superimposed (Step S31).

  Next, the shared screen control device 20 transmits the image data of each layer stored in the image data storage area 222 and the layer information registered in the layer table to each terminal device 30 (step S32). In the present embodiment, after displaying on the shared display 10, the image data and layer information of each layer are transmitted to the terminal device 20. However, when a request from the terminal device 30 is received, It is good also as a structure which returns the image data and layer information of each layer.

When the terminal device 30 receives the image data and layer information transmitted from the shared screen control device 20 (step S33), the terminal device 30 stores the image data and layer information in the storage unit 32 (step S34).
Next, the control unit 31 of the terminal device 30 determines whether a layer change request has been received through the operation unit 33 (step S35). When the change request is not accepted (S35: NO), the processing according to this flowchart is terminated.

  When the change request is accepted (S35: YES), the terminal device 30 accepts designation of the layer to be changed through the operation unit 33 (step S36), and accepts selection of image data used as the image of the layer after the change ( Step S37).

  Next, the control unit 31 changes the image of the designated layer and displays it on the display unit 34 (step S38), and transmits the changed layer image data and layer information to the shared screen control device 20 through the communication interface 35. (Step S39). In the second embodiment, since the image of the existing layer is changed, the layer number is the same as the existing one, and the layer information that is different only in the file name (or the content of the image data) of the image data is shared screen It is transmitted to the control device 20.

  When the shared screen control device 20 receives the image data and layer information of the layer to be changed from the terminal device 30 (step S40), the shared screen control device 20 stores the image data and layer information in the storage unit 22 (step S41). That is, the layer information management unit 23 stores the received image data as image data of an additional layer in the image data storage area 222 and registers the received layer information in the layer table in the layer information storage area 221. . At this time, the layer information management unit 23 searches the layer table for the layer information having the same layer number, and performs a process of rewriting and updating the searched layer information to the newly received layer information.

Embodiment 3 FIG.
In the first embodiment, the terminal device 30 receives an additional layer, the shared screen control device 20 performs layering including the additional layer, and displays an image of the superimposed layer on the shared display 10. However, the structure which receives deletion of a layer in each terminal device 30 may be sufficient.
In the third embodiment, a configuration for deleting an existing layer will be described. Note that the overall configuration of the display system and the internal configuration of each device are exactly the same as those in the first embodiment, and a description thereof will be omitted.

  FIG. 11 is a flowchart for explaining a processing procedure in the display system according to the third embodiment. It is assumed that the shared screen control device 20 has already acquired image data and layer information from a plurality of terminal devices 30, 30,. The image generation unit 24 of the shared screen control device 20 refers to the layer information registered in the layer table and generates an image in which the layers are superimposed. The control unit 21 outputs the image generated by the image generation unit 24 to the shared display 10 and causes the shared display 10 to display an image in which a plurality of layers are superimposed (Step S51).

  Next, the shared screen control device 20 transmits the image data of each layer stored in the image data storage area 222 and the layer information registered in the layer table to each terminal device 30 (step S52). In the present embodiment, after displaying on the shared display 10, the image data and layer information of each layer are transmitted to the terminal device 30. However, when a request from the terminal device 30 is received, It is good also as a structure which returns the image data and layer information of each layer.

When the terminal device 30 receives the image data and the layer information transmitted from the shared screen control device 20 (step S53), the terminal device 30 stores the image data and the layer information in the storage unit 32 (step S54).
Next, the control unit 31 of the terminal device 30 determines whether a layer deletion request has been received through the operation unit 33 (step S55). When the deletion request has not been accepted (S55: NO), the processing according to this flowchart is terminated.

When the deletion request is received (S55: YES), the terminal device 30 receives the designation of the layer to be deleted through the operation unit 33 (step S56).
Next, the control unit 31 displays an image excluding the image of the designated layer on the display unit 34 (step S57), and transmits the layer information of the designated layer to the shared screen control device 20 through the communication interface 35 (step S57). Step S58).

  When the shared screen control device 20 receives the layer information of the layer to be deleted from the terminal device 30 (step S59), the shared screen control device 20 deletes the layer information from the storage unit 22 (step S60). At this time, the layer information management unit 23 searches the layer table for layer information having the same layer number as the received layer information, and updates the layer table by deleting the searched layer information.

DESCRIPTION OF SYMBOLS 10 Shared display 20 Shared screen control apparatus 21 Control part 22 Storage part 23 Layer information management part 24 Image generation part 25 Output interface 26 Communication interface 30 Terminal device

Claims (5)

A display device, a plurality of image transmission devices for transmitting image data to display an image on the display device, and the image data transmitted from the image transmission device connected to the display device and the plurality of image transmission devices And a display system comprising an image generation device that generates a display image to be displayed on the display device based on the received image data.
The image generation device includes:
Storage means for storing a plurality of pieces of image data and rank information in which ranks of layers are determined for each of the image data in order to generate a display image in which an image based on each image data is superimposed as a layer;
Means for generating a display image by superimposing images based on each image data based on the ranking information;
Means for transmitting the image data and the order information stored in the storage means to each image transmission device,
Each image transmission device
Means for receiving image data and rank information transmitted from the image generation device;
Means for receiving image data to be added as a layer;
Means for setting a ranking different from the ranking included in the ranking information for the received image data;
Means for transmitting the image data and information on the order set in the image data to the image generation device,
The image generation device includes:
Means for receiving image data and rank information transmitted from the image transmission device;
A display system comprising: means for updating a display image to be displayed on the display device based on the received image data and order information. Each image transmission device
Means for receiving selection of image data to be changed among received image data;
Means for accepting the changed image data;
Means for transmitting the information specifying the selected image data and the received changed image data to the image generation device,
The image generation device includes:
Means for receiving information transmitted from the image transmission device and image data after change;
The display system according to claim 1, further comprising: a unit that stores the changed image data in the storage unit instead of the image data specified by the information. Each image transmission device
Means for accepting selection of image data to be deleted from received image data;
Means for transmitting information specifying the image data selected by the means to the image generating device,
The image generation device includes:
Means for receiving information transmitted from the image transmission device;
Means for deleting the image data specified by the received information from the storage means;
The display system according to claim 2, further comprising: means for erasing the order determined for the image data from the order information. In an image generation apparatus that includes a storage unit that stores a plurality of image data and generates an image based on the image data stored in the storage unit.
Means for storing rank information defining the rank of each layer for each of the image data in order to generate one image in which images based on each image data are superimposed as a layer;
Means for generating one image by superimposing images based on each image data based on the ranking information;
Means for transmitting image data and rank information stored in the storage means to an external device;
Means for receiving image data transmitted from the external device and information on the order set for the image data;
An image generating apparatus comprising: means for updating the one image based on the received image data and order information. In a computer program for causing a computer to generate one image from a plurality of image data,
In the computer,
In order to generate one image in which images based on each image data are superimposed as a layer, by using the rank information that determines the layer order for each of the image data, the images based on the respective image data are superimposed. Processing to generate an image of
Processing for transmitting the image data and the order information to an external device;
Processing for receiving image data transmitted from the external device and information on the order set for the image data;
A computer program for executing a process of updating the one image based on received image data and order information.