Videoconferencing on Personal Computers

The computer technology rapid development time, the picture document has the vital role one of as transmission information important methods. Each kind of picture form all has own characteristic and the application domain, each kind of picture document through the format conversion software realization mutual transformation, the user acts according to own demand choice appropriate form to achieve the best use effect. The development and the popularization which along with computer software, the hardware technology changes with each new day, the humanity already entered a high speed development the information time, the humanity probably has 80% information to come from the picture, in the scientific research, the technical application the picture processing technology more and more to become the essential method. Picture processing involves the domain has the military application, medicine diagnosis, industry monitoring, the object automatic minute examines recognition system and so on, these systems need the computer to provide the real-time tendency all, the effect lifelike picture.

Meeting of human society an integral part of economic life, the study shows that approximately 55% of the effectiveness of communication depends on the face (face-to-face) of the visual effects, 38% rely on talking voice, audio-visual people The most important form of access to information, and face to face discussions (face-to-face) is the most abundant human expression of ideas way. Since the industrial revolution, the technological advancement made a breakthrough progress in communication technology, telephone and telegraph invention of the distant sound of people and documents can be sent immediately. However, in addition to verbal communication, the human beings pay more attention to facial expressions and body expression, only voice transmission has been unable to meet the needs of modern communication, real-time video and interactive delivery of information more real and natural. (1) video conferencing system is in this generation, driven by an urgent need for a new generation of communications products.

Video Conferencing (VideoConference) system is a can sounds, images, text and other information sent from one place to another communication system. Effective transmission of video-based information on a remote sector and intersectoral cooperation, and also can be achieved, such as video conferencing and video applications such as video on demand technology. Video conference system is the computer technology and communication technology product of the combination, multimedia communication technology as an important part of being affected with the rise of the global information superhighway and has developed rapidly.

Video conferencing has been thirty years from the emergence, from the beginning to reduce travel costs, improve efficiency, to 911 domestic and international collaboration to accelerate the time to protect the personal safety, to safeguard social stability during SARS and the minimum work operation, the advantages of video conferencing is increasingly widely displayed. In view of the video conference system in the military, economic and cultural fields, the enormous role of the human and economic, national research and development of competing video conferencing systems, especially in very large scale integrated circuits, compression algorithms and visual physiology research breakthrough has been made and on a series of international standards for video conferencing were introduced, and a variety of image processing chips have the introduction of real-time video conferencing systems have come a long way before the practical development. The main application at home and abroad are:

Business Communication Business Conference

Enterprise customer service and product development Distance learning and technical training Market research and intelligence gathering Telemedicine and consultation

Cooperation in scientific research and engineering design Multinational application Staff recruitment

From the current perspective of the development, research on a lot of video conferencing technology, the products are very rich, although very attractive video conferencing system has broad prospects, but in this area there are considerable technical issues to be resolved, video conferencing systems at this stage of practicality, versatility and friendliness of the relevant technologies and related issues: software technology, database technology, network technology, sharing of technology, resource control, security technology and technology conference model.

The main research topics is the way of software, with the necessary peripherals to achieve a small video conferencing system. the basic principles of video conferencing systems Video Conferencing (VideoConference) system is the basic definition: two or more individuals or groups of different geographic location, through the transmission line and multimedia equipment, the sound, image, video, interactive video and file transfer data, to instant and interactive communication in order to complete the purpose of the conference system. Be read from above, video conferencing is a typical multimedia communications, the next diagram is a diagram of a typical video conferencing system: Figure 1.1 A typical schematic of a video conferencing system

From the above diagram we can basically tell, the video conferencing system has three main components, namely, communication networks, conferencing terminals and multipoint control unit. Video conferencing systems and computer technology is essentially the product of combining communication technology, so the communication network is based video conferencing system component of the terminal session is video, audio, data, signaling, and so a variety of digital signals, respectively after combined into

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