CN104980475B - Method and device for synchronously presenting display content - Google Patents
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Abstract
The invention discloses a method and a device for synchronously presenting display contents, wherein the method comprises the following steps: the multicast server receives client display description information from one electronic whiteboard of a plurality of electronic whiteboards, wherein the client display description information is used for describing contents displayed or to be displayed on the electronic whiteboard of the client; the multicast server generates display description information for synchronization according to the client display description information and the server display description information stored on the multicast server, and replaces the server display description information with the display description information for synchronization, wherein the server display description information is used for describing contents which are commonly and synchronously displayed on at least one electronic whiteboard in the plurality of electronic whiteboards; and the multicast server multicasts the display description information for synchronization to at least one electronic whiteboard. The invention solves the problem that the load of one electronic whiteboard is high because the electronic whiteboard sends the pictures to be synchronously displayed to other electronic whiteboards.
Description
Technical Field
the invention relates to the field of communication, in particular to a method and a device for synchronously presenting display contents.
Background
In the related art, there are two modes of an offline classroom and an online classroom for online teaching.
The off-line classroom generally adopts videos recorded in advance, students watch learning video courses, and the off-line classroom cannot interact with teachers in the teaching process, so that the students can only passively receive video contents in the learning process, and the learning process is boring and low in efficiency.
The online classroom generally adopts the form that teachers and students teach in real time, in the teaching process, teachers and students can communicate through audio or additional interactive windows, wherein the content communicated through the interactive windows is not limited to characters, but also can adopt figures, but because the interactive windows are separated from the display content of the electronic whiteboard for displaying the courseware content, if the content displayed by the electronic whiteboard needs to be annotated and the like, the online classroom cannot be realized through the interactive windows.
In the related art, a video conference system based on interactive operation of electronic whiteboards is proposed, in which a mode that input of one electronic whiteboard is displayed on the one electronic whiteboard and simultaneously directly transmitted to another electronic whiteboard for synchronous display is adopted, so that interactive operation and synchronous display between the two electronic whiteboards can be realized.
however, the inventors have found in the course of research that the interactive operation and the synchronous display of the electronic whiteboard proposed in the related art are applicable only between two electronic whiteboards. In an online classroom scene, tens of people or even hundreds of people may exist in the number of electronic whiteboards which need to be subjected to interactive operation or synchronous display at the same time, and under the condition that a large number of electronic whiteboards exist, input information is directly sent to other electronic whiteboards by adopting a scheme in the related technology so as to realize synchronous display, so that not only is the difficulty of configuration management increased, but also a very high load is caused to the electronic whiteboards which send the input information, and the problems of system breakdown, high display delay and picture delay are caused.
In order to solve the problem that in the related art, the load of one electronic whiteboard is high because the electronic whiteboard sends the picture to be synchronously displayed to other electronic whiteboards, an effective solution is not provided at present.
disclosure of Invention
The invention provides a method and a device for synchronously presenting display contents, which at least solve the problems.
According to an aspect of the present invention, there is provided a method for synchronous presentation of display content, comprising: the multicast server receives client display description information from one electronic whiteboard in a plurality of electronic whiteboards, wherein the client display description information is used for describing contents displayed or to be displayed on the electronic whiteboard of the client; the multicast server generates display description information for synchronization according to the client display description information and the server display description information stored on the multicast server, and replaces the server display description information with the display description information for synchronization, wherein the server display description information is used for describing contents which are commonly and synchronously displayed on at least one electronic whiteboard in the plurality of electronic whiteboards; and the multicast server multicasts the display description information for synchronization to the at least one electronic whiteboard.
preferably, the at least one electronic whiteboard comprises: the plurality of electronic whiteboards, or other electronic whiteboards except the one electronic whiteboard.
Preferably, the client display description information is generated by the electronic whiteboard according to the input of the user.
Preferably, the background color of at least one of the plurality of electronic whiteboards is black.
Preferably, after the multicasting server multicasts the display description information for synchronization to the at least one electronic whiteboard, the method further includes: the at least one electronic whiteboard receives the display description information for synchronization; the at least one electronic whiteboard displays the content described with the display description information for synchronization.
Preferably, the displaying, by the at least one electronic whiteboard, the content described with the display description information for synchronization includes: the at least one electronic whiteboard displays the content through an overlay layer, wherein the overlay layer is overlaid on an original layer of the at least one electronic whiteboard, and the original layer is used for displaying a virtual desktop multicast through the multicast server.
Preferably, the method further comprises: the multicast server receives a screen clearing instruction from one electronic whiteboard of the plurality of electronic whiteboards, wherein the screen clearing instruction is used for instructing the at least one electronic whiteboard to clear the content displayed by the overlay layer; and the multicast server multicasts the screen clearing instruction to the at least one electronic whiteboard.
Preferably, the method further comprises: the multicast server receives virtual desktop information from one electronic whiteboard of the plurality of electronic whiteboards, wherein the virtual desktop information is used for describing the virtual desktop displayed by the original layer; the multicast server judges whether the virtual desktop corresponding to the virtual desktop information is consistent with the virtual desktop currently displayed by the original layer; and the multicast server multicasts a screen clearing instruction to the at least one electronic whiteboard under the condition that the judgment result is inconsistent, wherein the screen clearing instruction is used for indicating the at least one electronic whiteboard to clear the content displayed by the superimposed layer.
Preferably, after the at least one electronic whiteboard displays the content through the overlay, the method further comprises: the at least one electronic whiteboard receives the screen clearing instruction; and the at least one electronic whiteboard clears the content displayed by the superimposed layer according to the screen clearing instruction.
According to another aspect of the present invention, there is also provided a synchronous presentation apparatus for displaying contents, including: the system comprises a receiving module, a display module and a display module, wherein the receiving module is used for receiving client display description information from one electronic whiteboard of a plurality of electronic whiteboards, and the client display description information is used for describing contents which are displayed or to be displayed on the electronic whiteboard of the client; a synchronization processing module, configured to generate display description information for synchronization according to the client display description information and locally stored device-side display description information, and replace the device-side display description information with the display description information for synchronization, where the device-side display description information is used to describe content that is commonly and synchronously displayed on at least one of the electronic whiteboards; and the multicast module is used for multicasting the display description information for synchronization to the at least one electronic whiteboard.
According to the invention, a multicast server is adopted to receive the client display description information from one electronic whiteboard in a plurality of electronic whiteboards, wherein the client display description information is used for describing the content displayed or to be displayed on the electronic whiteboard of the client; the multicast server generates the display description information for synchronization according to the client display description information and the server display description information stored in the multicast server, and then multicasts the display description information for synchronization to at least one electronic whiteboard in a plurality of electronic whiteboards, so that the problem of high load of one electronic whiteboard caused by sending a picture to be synchronously displayed to other electronic whiteboards through one electronic whiteboard in the related art is solved, and the stability of the system is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart diagram of a method of synchronized presentation of display content in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a synchronous rendering apparatus for displaying content according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for synchronous presentation of display content according to an embodiment of the present invention.
Detailed Description
it should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The steps illustrated in the flow charts of the drawings may be performed in a computer system such as a set of computer-executable instructions and, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a schematic flow chart of a method for synchronously presenting display contents according to an embodiment of the present invention, and as shown in fig. 1, the flow chart includes the following steps:
In step S102, the multicast server receives the client display description information from one of the electronic whiteboards.
In this embodiment, the multicast server for providing information services to a large number of users may receive, through a wired connection manner or a wireless connection manner, client display description information from one of the electronic whiteboards, where the client display description information is used to describe content that has been displayed or is to be displayed on the electronic whiteboard of the client. The electronic whiteboard may itself serve as a client connected to the multicast server, or may be integrated with other hardware to collectively serve as a client connected to the multicast server.
In this embodiment, the wireless connection modes include, but are not limited to, a 3G connection, a WiFi connection, a bluetooth connection, a WiMAX connection, a Zigbee connection, a uwb (ultra wideband) connection, or other wireless connection modes developed in the future.
Step S104, the multicast server generates display description information for synchronization according to the client display description information and the server display description information stored in the multicast server.
In this embodiment, the multicast server first generates the display description information for synchronization according to the client-side display description information received from one of the electronic whiteboards and the server-side display description information stored in the multicast server, where the server-side display description information is used to describe the content of the synchronous display common to at least one of the electronic whiteboards. For example, the multicast server may analyze and synthesize the client display description information and the server display description information, so that the obtained to-be-displayed content described by the display description information for synchronization is a fusion or a covering of the to-be-displayed content described by the client display description information and the displayed content described by the server display description information.
After the generation of the display description information for synchronization, the multicast server further replaces the server-side display description information with the display description information for synchronization. Step S106, the multicast server multicasts the display description information for synchronization to the at least one electronic whiteboard.
By means of the steps, the multicast server generates the synchronous display description information according to the client display description information sent from one electronic whiteboard of the plurality of electronic whiteboards and the server display description information stored in the multicast server, and multicasts the synchronous display description information to at least one electronic whiteboard, so that the load of the electronic whiteboard sending the client display description information is effectively reduced, the problem of high load of the electronic whiteboard caused by sending a picture to be displayed to other electronic whiteboards through one electronic whiteboard in the related art is solved, and the stability of the system is improved. In addition, in the process of route configuration, because multicast information of the multicast server is adopted, each electronic whiteboard does not need to be configured with the position information of other electronic whiteboards, and the addition or deletion of the electronic whiteboards can be realized through the configuration of the multicast server, so that the configuration management of a plurality of electronic whiteboards is simplified.
Preferably, the at least one electronic whiteboard includes: all of the plurality of electronic whiteboards, or the electronic whiteboards other than the electronic whiteboard transmitting the display description information among the plurality of electronic whiteboards.
preferably, the client display description information is generated by an electronic whiteboard sending the client display description information according to the input of a user, wherein the user can input the client display description information through input equipment such as a keyboard, a mouse, a tablet and the like; preferably, the user uses a touch screen matched with the electronic whiteboard display screen for inputting.
Preferably, the user input comprises at least one of: characters and figures. The characters can be texts input by a common input method, such as Chinese characters and letters, and the graphs can be a series of tracks input by a touch screen.
Preferably, the background color of at least one of the plurality of electronic whiteboards is black, so that a user of the electronic whiteboard obtains a more realistic real classroom experience.
Preferably, after multicasting the display description information for synchronization to the at least one electronic whiteboard, the multicast server receives the display description information for synchronization and displays the content described by the display description information for synchronization.
Preferably, the user inputs are encapsulated into the client display description information at certain intervals, and are processed into the display description information for synchronization by the multicast server and then multicast to other electronic whiteboards, so that the dynamic user inputs synchronized with each other in display are presented on the other electronic whiteboards. Preferably, the certain interval is less than 100 milliseconds.
Before the at least one electronic whiteboard displays the content corresponding to the display description information for synchronization, the at least one electronic whiteboard displays a virtual desktop multicast by the multicast server, and preferably, the at least one electronic whiteboard displays the content described by the display description information for synchronization through an overlay layer, wherein the overlay layer is overlaid on an original layer of the at least one electronic whiteboard, and the original layer is used for displaying the virtual desktop multicast by the multicast server.
In the related art, the virtual desktop is generally used for displaying a teaching plan or adopting a white background, so that the online classroom does not have the sense of restitution of a classroom, and the white background easily causes visual fatigue.
The content described with the display description information for synchronization need not be permanently displayed in an overlying layer of the electronic whiteboard, in some cases, for example: and the virtual desktop switches the display page or needs to clear the content described by the current synchronous display description information on the current display page, and then can clear all or part of the content displayed on the superimposed layer through a screen clearing instruction.
In some embodiments, the screen clearing instruction is generated by one of the electronic whiteboards, for example, a screen clearing button is arranged on the electronic whiteboard, and the user generates the screen clearing instruction by clicking the screen clearing button; or, the electronic whiteboard serving as the main control device in the plurality of electronic whiteboards automatically generates a screen clearing instruction when detecting that the display page is switched by the virtual desktop. The main control device can perform authority control on other electronic whiteboards. Preferably, the multicast server receives a screen clearing instruction from one of the electronic whiteboards, and multicasts the screen clearing instruction to at least one electronic whiteboard, wherein the screen clearing instruction is used for instructing the at least one electronic whiteboard to clear the content displayed by the overlay layer.
In other embodiments, the clear instruction is generated by a multicast server, for example: the multicast server receives virtual desktop information from one electronic whiteboard of a plurality of electronic whiteboards, wherein the virtual desktop information is used for describing a virtual desktop displayed in an original layer; the multicast server judges whether the virtual desktop corresponding to the virtual desktop information is consistent with the virtual desktop currently displayed in the original layer; and multicasting a screen clearing instruction to the at least one electronic whiteboard by the multicast server under the condition that the judgment result is inconsistent, wherein the screen clearing instruction is used for indicating the at least one electronic whiteboard to clear the contents displayed by the superimposed layer.
Preferably, after the at least one electronic whiteboard displays the content through the superimposed layer, the at least one electronic whiteboard receives a screen clearing instruction and clears the content displayed by the superimposed layer.
The present embodiment further provides a device for synchronously presenting display content, where the device is configured to implement the method for synchronously presenting display content, and the implementation of the function in the device embodiment is described in detail in the method embodiment, and will not be described again here.
Fig. 2 is a schematic structural diagram of an apparatus for synchronously presenting display contents according to an embodiment of the present invention, as shown in fig. 2, the apparatus includes: the system comprises a receiving module 22, a synchronization processing module 24 and a multicasting module 26, wherein the receiving module 22 is configured to receive client display description information from one electronic whiteboard of a plurality of electronic whiteboards, and the client display description information is used for describing content that is already displayed or is to be displayed on the electronic whiteboard of the client; a synchronization processing module 24 coupled between the receiving module 22 and the multicasting module 26, configured to generate display description information for synchronization according to the client display description information and locally stored device-side display description information, and replace the device-side display description information with the display description information for synchronization, where the device-side display description information is used to describe content that is commonly and synchronously displayed on at least one electronic whiteboard of the plurality of electronic whiteboards; a multicast module 26, configured to multicast the display description information for synchronization to the at least one electronic whiteboard.
the modules and units related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware. The modules and units described in this embodiment may also be disposed in the processor, and for example, may be described as: a processor includes a receive module 22, a synchronization processing module 24, and a multicast module 26. The names of these modules do not in some cases constitute a limitation on the module itself, and for example, the receiving module 22 may also be described as a "module for receiving client display description information from one of a plurality of electronic whiteboards".
Preferably, the at least one electronic whiteboard comprises: a plurality of electronic whiteboards, or, other electronic whiteboards than one electronic whiteboard among the plurality of electronic whiteboards.
preferably, the client display description information is generated by the electronic whiteboard sending the client display description information according to the input of the user.
Preferably, the user input comprises at least one of: characters and figures.
Preferably, the apparatus further comprises: the second receiving module is used for receiving a screen clearing instruction from one electronic whiteboard of the plurality of electronic whiteboards, wherein the screen clearing instruction is used for indicating at least one electronic whiteboard to clear the content displayed by the superimposed layer; the second multicast module is coupled to the second receiving module and is used for multicasting the screen clearing instruction to at least one electronic whiteboard.
Preferably, the apparatus further comprises: the third receiving module is used for receiving virtual desktop information from one electronic whiteboard of the plurality of electronic whiteboards, wherein the virtual desktop information is used for describing a virtual desktop displayed in an original layer; the judging module is coupled to the third receiving module and used for judging whether the virtual desktop corresponding to the virtual desktop information is consistent with the virtual desktop currently displayed in the original layer; and the third multicast module is coupled to the judging module and used for multicasting a screen clearing instruction to the at least one electronic whiteboard under the condition that the judgment result is inconsistent, wherein the screen clearing instruction is used for indicating the at least one electronic whiteboard to clear the content displayed by the superimposed layer.
Fig. 3 is a schematic structural diagram of a system for synchronously presenting display contents according to an embodiment of the present invention, and as shown in fig. 3, the system includes the above-mentioned device for synchronously presenting display contents, where the device for synchronously presenting display contents is located in a multicast server or is connected to the multicast server; the system further comprises a plurality of electronic whiteboards, wherein after the multicast server multicasts the display description information for synchronization to at least one electronic whiteboard, at least one electronic whiteboard of the plurality of electronic whiteboards receiving the display description information for synchronization displays the content described by the display description information for synchronization.
Preferably, the at least one electronic whiteboard is configured to display the content through an overlay layer, wherein the overlay layer is overlaid on an original layer of the at least one electronic whiteboard, and the original layer is configured to display the virtual desktop multicast through the multicast server.
Preferably, the at least one electronic whiteboard is further configured to receive a screen clearing instruction, and clear the content displayed by the overlying layer according to the screen clearing instruction.
In summary, by adopting the synchronous presentation scheme of the display content provided by the embodiment of the invention, the black writing background and the electronic whiteboard function can be provided for the user when online classroom teaching is performed, and the functions of interactive operation of students and screen writing and synchronous display of teachers are provided, so that the user experience is ensured, and the interactivity is improved.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for synchronized presentation of display content, comprising:
The multicast server receives client display description information from one electronic whiteboard in a plurality of electronic whiteboards, wherein the client display description information is used for describing contents displayed or to be displayed on the electronic whiteboard of the client;
the multicast server generates display description information for synchronization according to the client display description information and the server display description information stored on the multicast server, and replaces the server display description information with the display description information for synchronization, wherein the server display description information is used for describing contents which are commonly and synchronously displayed on at least one electronic whiteboard in the plurality of electronic whiteboards, and the obtained contents to be displayed and described by the display description information for synchronization are the fusion or the covering of the contents to be displayed and described by the client display description information and the displayed contents described by the server display description information;
and the multicast server multicasts the display description information for synchronization to the at least one electronic whiteboard.
2. the method of claim 1, wherein the at least one electronic whiteboard comprises: the plurality of electronic whiteboards, or other electronic whiteboards except the one electronic whiteboard.
3. The method of claim 1, wherein the client display description information is generated by the one electronic whiteboard based on user input.
4. The method of claim 1, wherein the background color of at least one of the plurality of electronic whiteboards is black.
5. The method according to any one of claims 1 to 4, wherein after the multicasting server multicasts the display description information for synchronization to the at least one electronic whiteboard, the method further comprises:
The at least one electronic whiteboard receives the display description information for synchronization;
the at least one electronic whiteboard displays the content described by the display description information for synchronization.
6. The method according to claim 5, wherein the at least one electronic whiteboard displaying the content described by the synchronization display description information comprises:
And the at least one electronic whiteboard displays the content described by the synchronous display description information through an overlay layer, wherein the overlay layer is overlaid on an original layer of the at least one electronic whiteboard, and the original layer is used for displaying the virtual desktop multicast by the multicast server.
7. The method of claim 6, further comprising:
The multicast server receives a screen clearing instruction from one electronic whiteboard of the plurality of electronic whiteboards, wherein the screen clearing instruction is used for instructing the at least one electronic whiteboard to clear the contents displayed by the overlay layer;
And the multicast server multicasts the screen clearing instruction to the at least one electronic whiteboard.
8. the method of claim 6, further comprising:
The multicast server receives virtual desktop information from one electronic whiteboard of the plurality of electronic whiteboards, wherein the virtual desktop information is used for describing the virtual desktop displayed by the original layer;
the multicast server judges whether the virtual desktop corresponding to the virtual desktop information is consistent with the virtual desktop currently displayed by the original layer;
and the multicast server multicasts a screen clearing instruction to the at least one electronic whiteboard under the condition that the judgment result is inconsistent, wherein the screen clearing instruction is used for indicating the at least one electronic whiteboard to clear the contents displayed by the superimposed layer.
9. The method according to claim 7 or 8, wherein after the at least one electronic whiteboard displays the content described with the display description information for synchronization through the overlay layer, the method further comprises:
The at least one electronic whiteboard receives the screen clearing instruction;
And the at least one electronic whiteboard clears the content displayed by the superimposed layer according to the screen clearing instruction.
10. A synchronous rendering apparatus for displaying content, comprising:
The system comprises a receiving module, a display module and a display module, wherein the receiving module is used for receiving client display description information from one electronic whiteboard of a plurality of electronic whiteboards, and the client display description information is used for describing contents which are displayed or to be displayed on the electronic whiteboard of the client;
A synchronization processing module, configured to generate display description information for synchronization according to the client display description information and locally stored device-side display description information, and replace the device-side display description information with the display description information for synchronization, where the device-side display description information is used to describe content that is commonly and synchronously displayed on at least one of the electronic whiteboards, and the obtained content to be displayed, which is described by the display description information for synchronization, is a fusion or a covering of the content to be displayed, which is described by the client display description information, and the displayed content, which is described by the device-side display description information;
And the multicast module is used for multicasting the display description information for synchronization to the at least one electronic whiteboard.
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| CN105975233B (en) * | 2016-05-11 | 2019-02-05 | 富国 | One kind is the same as the multi-party demenstration method of screen and device |
| US11102425B2 (en) * | 2017-03-08 | 2021-08-24 | Sony Corporation | Image processing apparatus and image processing method |
| CN107370982A (en) * | 2017-08-15 | 2017-11-21 | 北京北纬天辰科技有限公司 | Tele-conferencing system based on electronic whiteboard |
| CN108156502A (en) * | 2018-01-05 | 2018-06-12 | 创盛视联数码科技（北京）有限公司 | A kind of method for improving paintbrush and word net cast synchronism |
| CN109062529A (en) * | 2018-08-07 | 2018-12-21 | 广州登云信息科技有限公司 | A kind of three-screen-interaction meeting plate software implementation method based on cloud deployment |
| CN111355700B (en) * | 2019-06-27 | 2023-04-07 | 鸿合科技股份有限公司 | Network whiteboard sharing method and system and electronic equipment |
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