| In recent years, with the development of network technology and increasing sophistication of communications technology, Web-based remote-site and interactive video/audio conferencing systems have become a hot topic of research at home and abroad.The emergence and development of this kind of conferencing systems gradually change the way people communicate with each other.Screen sharing is an important function of the web conferencing system, which can accurately transmit the screen information in the sharing terminal to the watching terminal. Therefore, it is of great significance to do this research.The requirements analysis, design and implementation of the screen sharing subsystem are described in detail in this thesis. The screen sharing subsystem can be divided into two models:the server and the client. The server is subdivided into screen sharing server, WEB server and conversion server, and the client is subdivided into sharing terminal and watching terminal. In the screen sharing subsystem, the sharing terminal gets its mouse and input information of the keyboard, captures the screen image ,compress the changed area and sends them to the server. After receiving the data, the server forwards them to the watching terminal. Finally, the watching terminal receives the data, decompress and display the bitmap. The method of introducing the event-driven mechanism in the sharing terminal and multicast in the server is used to realize the screen sharing.Compared with the traditional method of capturing screen and using broadcast to transmit data, this new method can reduce the influences not only on the occupation of the server and network resources but also on other machines that do not participate in the conference within the LAN.The test results show that this system can operate normally, and its functions meet the users'requirements. If in a better configuration environment, the system will operate more smoothly and have a better result. |
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